Merge pull request #91 from xfxyjwf/android_nano

Merge nano proto into protobuf repository.

Android.mk

@@ -0,0 +1,486 @@
+# Copyright (C) 2009 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+
+LOCAL_PATH := $(call my-dir)
+
+IGNORED_WARNINGS := -Wno-sign-compare -Wno-unused-parameter -Wno-sign-promo
+
+CC_LITE_SRC_FILES := \
+    src/google/protobuf/stubs/common.cc                              \
+    src/google/protobuf/stubs/once.cc                                \
+    src/google/protobuf/stubs/hash.cc                                \
+    src/google/protobuf/stubs/hash.h                                 \
+    src/google/protobuf/stubs/map-util.h                             \
+    src/google/protobuf/stubs/stl_util-inl.h                         \
+    src/google/protobuf/extension_set.cc                             \
+    src/google/protobuf/generated_message_util.cc                    \
+    src/google/protobuf/message_lite.cc                              \
+    src/google/protobuf/repeated_field.cc                            \
+    src/google/protobuf/wire_format_lite.cc                          \
+    src/google/protobuf/io/coded_stream.cc                           \
+    src/google/protobuf/io/coded_stream_inl.h                        \
+    src/google/protobuf/io/zero_copy_stream.cc                       \
+    src/google/protobuf/io/zero_copy_stream_impl_lite.cc
+
+JAVA_LITE_SRC_FILES := \
+    java/src/main/java/com/google/protobuf/UninitializedMessageException.java \
+    java/src/main/java/com/google/protobuf/MessageLite.java \
+    java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java \
+    java/src/main/java/com/google/protobuf/CodedOutputStream.java \
+    java/src/main/java/com/google/protobuf/ByteString.java \
+    java/src/main/java/com/google/protobuf/CodedInputStream.java \
+    java/src/main/java/com/google/protobuf/ExtensionRegistryLite.java \
+    java/src/main/java/com/google/protobuf/AbstractMessageLite.java \
+    java/src/main/java/com/google/protobuf/FieldSet.java \
+    java/src/main/java/com/google/protobuf/Internal.java \
+    java/src/main/java/com/google/protobuf/WireFormat.java \
+    java/src/main/java/com/google/protobuf/GeneratedMessageLite.java
+
+COMPILER_SRC_FILES :=  \
+    src/google/protobuf/descriptor.cc \
+    src/google/protobuf/descriptor.pb.cc \
+    src/google/protobuf/descriptor_database.cc \
+    src/google/protobuf/dynamic_message.cc \
+    src/google/protobuf/extension_set.cc \
+    src/google/protobuf/extension_set_heavy.cc \
+    src/google/protobuf/generated_message_reflection.cc \
+    src/google/protobuf/generated_message_util.cc \
+    src/google/protobuf/message.cc \
+    src/google/protobuf/message_lite.cc \
+    src/google/protobuf/reflection_ops.cc \
+    src/google/protobuf/repeated_field.cc \
+    src/google/protobuf/service.cc \
+    src/google/protobuf/text_format.cc \
+    src/google/protobuf/unknown_field_set.cc \
+    src/google/protobuf/wire_format.cc \
+    src/google/protobuf/wire_format_lite.cc \
+    src/google/protobuf/compiler/code_generator.cc \
+    src/google/protobuf/compiler/command_line_interface.cc \
+    src/google/protobuf/compiler/importer.cc \
+    src/google/protobuf/compiler/main.cc \
+    src/google/protobuf/compiler/parser.cc \
+    src/google/protobuf/compiler/plugin.cc \
+    src/google/protobuf/compiler/plugin.pb.cc \
+    src/google/protobuf/compiler/subprocess.cc \
+    src/google/protobuf/compiler/zip_writer.cc \
+    src/google/protobuf/compiler/cpp/cpp_enum.cc \
+    src/google/protobuf/compiler/cpp/cpp_enum_field.cc \
+    src/google/protobuf/compiler/cpp/cpp_extension.cc \
+    src/google/protobuf/compiler/cpp/cpp_field.cc \
+    src/google/protobuf/compiler/cpp/cpp_file.cc \
+    src/google/protobuf/compiler/cpp/cpp_generator.cc \
+    src/google/protobuf/compiler/cpp/cpp_helpers.cc \
+    src/google/protobuf/compiler/cpp/cpp_message.cc \
+    src/google/protobuf/compiler/cpp/cpp_message_field.cc \
+    src/google/protobuf/compiler/cpp/cpp_primitive_field.cc \
+    src/google/protobuf/compiler/cpp/cpp_service.cc \
+    src/google/protobuf/compiler/cpp/cpp_string_field.cc \
+    src/google/protobuf/compiler/java/java_enum.cc \
+    src/google/protobuf/compiler/java/java_enum_field.cc \
+    src/google/protobuf/compiler/java/java_extension.cc \
+    src/google/protobuf/compiler/java/java_field.cc \
+    src/google/protobuf/compiler/java/java_file.cc \
+    src/google/protobuf/compiler/java/java_generator.cc \
+    src/google/protobuf/compiler/java/java_helpers.cc \
+    src/google/protobuf/compiler/java/java_message.cc \
+    src/google/protobuf/compiler/java/java_message_field.cc \
+    src/google/protobuf/compiler/java/java_primitive_field.cc \
+    src/google/protobuf/compiler/java/java_service.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_enum.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_enum_field.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_field.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_file.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_generator.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_helpers.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_message.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_message_field.cc \
+    src/google/protobuf/compiler/javamicro/javamicro_primitive_field.cc \
+    src/google/protobuf/compiler/javanano/javanano_enum.cc \
+    src/google/protobuf/compiler/javanano/javanano_enum_field.cc \
+    src/google/protobuf/compiler/javanano/javanano_extension.cc \
+    src/google/protobuf/compiler/javanano/javanano_field.cc \
+    src/google/protobuf/compiler/javanano/javanano_file.cc \
+    src/google/protobuf/compiler/javanano/javanano_generator.cc \
+    src/google/protobuf/compiler/javanano/javanano_helpers.cc \
+    src/google/protobuf/compiler/javanano/javanano_message.cc \
+    src/google/protobuf/compiler/javanano/javanano_message_field.cc \
+    src/google/protobuf/compiler/javanano/javanano_primitive_field.cc \
+    src/google/protobuf/compiler/python/python_generator.cc \
+    src/google/protobuf/io/coded_stream.cc \
+    src/google/protobuf/io/gzip_stream.cc \
+    src/google/protobuf/io/printer.cc \
+    src/google/protobuf/io/tokenizer.cc \
+    src/google/protobuf/io/zero_copy_stream.cc \
+    src/google/protobuf/io/zero_copy_stream_impl.cc \
+    src/google/protobuf/io/zero_copy_stream_impl_lite.cc \
+    src/google/protobuf/stubs/common.cc \
+    src/google/protobuf/stubs/hash.cc \
+    src/google/protobuf/stubs/once.cc \
+    src/google/protobuf/stubs/structurally_valid.cc \
+    src/google/protobuf/stubs/strutil.cc \
+    src/google/protobuf/stubs/substitute.cc
+
+# Java nano library (for device-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-java-nano
+LOCAL_MODULE_TAGS := optional
+LOCAL_SDK_VERSION := 8
+
+LOCAL_SRC_FILES := $(call all-java-files-under, java/src/main/java/com/google/protobuf/nano)
+LOCAL_SRC_FILES += $(call all-java-files-under, java/src/device/main/java/com/google/protobuf/nano)
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+# Java nano library (for host-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := host-libprotobuf-java-nano
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(call all-java-files-under, java/src/main/java/com/google/protobuf/nano)
+
+include $(BUILD_HOST_JAVA_LIBRARY)
+
+# Java micro library (for device-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-java-micro
+LOCAL_MODULE_TAGS := optional
+LOCAL_SDK_VERSION := 8
+
+LOCAL_SRC_FILES := $(call all-java-files-under, java/src/main/java/com/google/protobuf/micro)
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+# Java micro library (for host-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := host-libprotobuf-java-micro
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(call all-java-files-under, java/src/main/java/com/google/protobuf/micro)
+
+include $(BUILD_HOST_JAVA_LIBRARY)
+
+# Java lite library (for device-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-java-lite
+LOCAL_MODULE_TAGS := optional
+LOCAL_SDK_VERSION := 8
+
+LOCAL_SRC_FILES := $(JAVA_LITE_SRC_FILES)
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+# Java lite library (for host-side users)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := host-libprotobuf-java-lite
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(JAVA_LITE_SRC_FILES)
+
+include $(BUILD_HOST_JAVA_LIBRARY)
+
+# C++ lite library
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-cpp-lite
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_CPP_EXTENSION := .cc
+
+LOCAL_SRC_FILES := $(CC_LITE_SRC_FILES)
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    $(LOCAL_PATH)/src
+
+# Define the header files to be copied
+#LOCAL_COPY_HEADERS := \
+#    src/google/protobuf/stubs/once.h \
+#    src/google/protobuf/stubs/common.h \
+#    src/google/protobuf/io/coded_stream.h \
+#    src/google/protobuf/generated_message_util.h \
+#    src/google/protobuf/repeated_field.h \
+#    src/google/protobuf/extension_set.h \
+#    src/google/protobuf/wire_format_lite_inl.h
+#
+#LOCAL_COPY_HEADERS_TO := $(LOCAL_MODULE)
+
+LOCAL_CFLAGS := -DGOOGLE_PROTOBUF_NO_RTTI $(IGNORED_WARNINGS)
+
+# These are the minimum versions and don't need to be update.
+ifeq ($(TARGET_ARCH),arm)
+LOCAL_SDK_VERSION := 8
+else
+# x86/mips support only available from API 9.
+LOCAL_SDK_VERSION := 9
+endif
+LOCAL_NDK_STL_VARIANT := stlport_static
+
+include $(BUILD_STATIC_LIBRARY)
+
+# C++ lite library (libc++ flavored for the platform)
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-cpp-lite
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_CPP_EXTENSION := .cc
+
+LOCAL_SRC_FILES := $(CC_LITE_SRC_FILES)
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    $(LOCAL_PATH)/src
+
+LOCAL_CFLAGS := -DGOOGLE_PROTOBUF_NO_RTTI $(IGNORED_WARNINGS)
+
+include $(BUILD_SHARED_LIBRARY)
+
+# C++ full library
+# =======================================================
+protobuf_cc_full_src_files := \
+    $(CC_LITE_SRC_FILES)                                             \
+    src/google/protobuf/stubs/strutil.cc                             \
+    src/google/protobuf/stubs/strutil.h                              \
+    src/google/protobuf/stubs/substitute.cc                          \
+    src/google/protobuf/stubs/substitute.h                           \
+    src/google/protobuf/stubs/structurally_valid.cc                  \
+    src/google/protobuf/descriptor.cc                                \
+    src/google/protobuf/descriptor.pb.cc                             \
+    src/google/protobuf/descriptor_database.cc                       \
+    src/google/protobuf/dynamic_message.cc                           \
+    src/google/protobuf/extension_set_heavy.cc                       \
+    src/google/protobuf/generated_message_reflection.cc              \
+    src/google/protobuf/message.cc                                   \
+    src/google/protobuf/reflection_ops.cc                            \
+    src/google/protobuf/service.cc                                   \
+    src/google/protobuf/text_format.cc                               \
+    src/google/protobuf/unknown_field_set.cc                         \
+    src/google/protobuf/wire_format.cc                               \
+    src/google/protobuf/io/gzip_stream.cc                            \
+    src/google/protobuf/io/printer.cc                                \
+    src/google/protobuf/io/tokenizer.cc                              \
+    src/google/protobuf/io/zero_copy_stream_impl.cc                  \
+    src/google/protobuf/compiler/importer.cc                         \
+    src/google/protobuf/compiler/parser.cc
+
+# C++ full library - stlport version
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-cpp-full
+LOCAL_MODULE_TAGS := optional
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_SRC_FILES := $(protobuf_cc_full_src_files)
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    external/zlib \
+    $(LOCAL_PATH)/src
+
+# Define the header files to be copied
+#LOCAL_COPY_HEADERS := \
+#    src/google/protobuf/stubs/once.h \
+#    src/google/protobuf/stubs/common.h \
+#    src/google/protobuf/io/coded_stream.h \
+#    src/google/protobuf/generated_message_util.h \
+#    src/google/protobuf/repeated_field.h \
+#    src/google/protobuf/extension_set.h \
+#    src/google/protobuf/wire_format_lite_inl.h
+#
+#LOCAL_COPY_HEADERS_TO := $(LOCAL_MODULE)
+
+LOCAL_CFLAGS := -DGOOGLE_PROTOBUF_NO_RTTI $(IGNORED_WARNINGS)
+
+# These are the minimum versions and don't need to be update.
+ifeq ($(TARGET_ARCH),arm)
+LOCAL_SDK_VERSION := 8
+else
+# x86/mips support only available from API 9.
+LOCAL_SDK_VERSION := 9
+endif
+LOCAL_NDK_STL_VARIANT := stlport_static
+
+include $(BUILD_STATIC_LIBRARY)
+
+# C++ full library - Gnustl+rtti version
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-cpp-full-gnustl-rtti
+LOCAL_MODULE_TAGS := optional
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_SRC_FILES := $(protobuf_cc_full_src_files)
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    external/zlib \
+    $(LOCAL_PATH)/src
+
+LOCAL_CFLAGS := -frtti $(IGNORED_WARNINGS)
+LOCAL_SDK_VERSION := 14
+LOCAL_NDK_STL_VARIANT := gnustl_static
+
+include $(BUILD_STATIC_LIBRARY)
+
+# C++ full library - libc++ version for the platform
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libprotobuf-cpp-full
+LOCAL_MODULE_TAGS := optional
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_SRC_FILES := $(protobuf_cc_full_src_files)
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    external/zlib \
+    $(LOCAL_PATH)/src
+
+LOCAL_CFLAGS := -DGOOGLE_PROTOBUF_NO_RTTI $(IGNORED_WARNINGS)
+LOCAL_SHARED_LIBRARIES := libz
+
+include $(BUILD_SHARED_LIBRARY)
+
+# Clean temp vars
+protobuf_cc_full_src_files :=
+
+
+# Android Protocol buffer compiler, aprotoc (host executable)
+# used by the build systems as $(PROTOC) defined in
+# build/core/config.mk
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := aprotoc
+LOCAL_MODULE_CLASS := EXECUTABLES
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_SRC_FILES := $(COMPILER_SRC_FILES)
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/android \
+    external/zlib \
+    $(LOCAL_PATH)/src
+
+LOCAL_STATIC_LIBRARIES += libz
+
+ifneq ($(HOST_OS),windows)
+LOCAL_LDLIBS := -lpthread
+endif
+
+LOCAL_CFLAGS := $(IGNORED_WARNINGS)
+
+include $(BUILD_HOST_EXECUTABLE)
+
+# To test java proto params build rules.
+# =======================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := aprotoc-test-nano-params
+LOCAL_MODULE_TAGS := tests
+LOCAL_SDK_VERSION := current
+
+LOCAL_PROTOC_OPTIMIZE_TYPE := nano
+
+LOCAL_SRC_FILES := \
+        src/google/protobuf/unittest_import_nano.proto \
+        src/google/protobuf/unittest_simple_nano.proto \
+        src/google/protobuf/unittest_stringutf8_nano.proto \
+        src/google/protobuf/unittest_recursive_nano.proto
+
+
+LOCAL_PROTOC_FLAGS := --proto_path=$(LOCAL_PATH)/src
+
+LOCAL_PROTO_JAVA_OUTPUT_PARAMS := \
+        java_package = $(LOCAL_PATH)/src/google/protobuf/unittest_import_nano.proto|com.google.protobuf.nano, \
+        java_outer_classname = $(LOCAL_PATH)/src/google/protobuf/unittest_import_nano.proto|UnittestImportNano
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+# To test Android-specific nanoproto features.
+# =======================================================
+include $(CLEAR_VARS)
+
+# Parcelable messages
+LOCAL_MODULE := android-nano-test-parcelable
+LOCAL_MODULE_TAGS := tests
+LOCAL_SDK_VERSION := current
+
+LOCAL_PROTOC_OPTIMIZE_TYPE := nano
+
+LOCAL_SRC_FILES := src/google/protobuf/unittest_simple_nano.proto
+
+LOCAL_PROTOC_FLAGS := --proto_path=$(LOCAL_PATH)/src
+
+LOCAL_PROTO_JAVA_OUTPUT_PARAMS := \
+        parcelable_messages = true
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+include $(CLEAR_VARS)
+
+# Parcelable and extendable messages
+LOCAL_MODULE := android-nano-test-parcelable-extendable
+LOCAL_MODULE_TAGS := tests
+LOCAL_SDK_VERSION := current
+
+LOCAL_PROTOC_OPTIMIZE_TYPE := nano
+
+LOCAL_SRC_FILES := src/google/protobuf/unittest_extension_nano.proto
+
+LOCAL_PROTOC_FLAGS := --proto_path=$(LOCAL_PATH)/src
+
+LOCAL_PROTO_JAVA_OUTPUT_PARAMS := \
+        parcelable_messages = true, \
+        store_unknown_fields = true
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+include $(CLEAR_VARS)
+
+# Test APK
+LOCAL_PACKAGE_NAME := NanoAndroidTest
+
+LOCAL_SDK_VERSION := 8
+
+LOCAL_MODULE_TAGS := tests
+
+LOCAL_SRC_FILES := $(call all-java-files-under, java/src/device/test/java/com/google/protobuf/nano)
+
+LOCAL_MANIFEST_FILE := java/src/device/test/AndroidManifest.xml
+
+LOCAL_STATIC_JAVA_LIBRARIES := libprotobuf-java-nano \
+        android-nano-test-parcelable \
+        android-nano-test-parcelable-extendable
+
+LOCAL_DEX_PREOPT := false
+
+include $(BUILD_PACKAGE)
+
+# 2.3.0 prebuilts for backwards compatibility.
+include $(LOCAL_PATH)/prebuilts/Android.mk

javanano/README.txt

@@ -0,0 +1,354 @@
+Protocol Buffers - Google's data interchange format
+Copyright 2008 Google Inc.
+
+This directory contains the Java Protocol Buffers Nano runtime library.
+
+Installation - With Maven
+=========================
+
+The Protocol Buffers build is managed using Maven.  If you would
+rather build without Maven, see below.
+
+1) Install Apache Maven if you don't have it:
+
+     http://maven.apache.org/
+
+2) Build the C++ code, or obtain a binary distribution of protoc.  If
+   you install a binary distribution, make sure that it is the same
+   version as this package.  If in doubt, run:
+
+     $ protoc --version
+
+   You will need to place the protoc executable in ../src.  (If you
+   built it yourself, it should already be there.)
+
+3) Run the tests:
+
+     $ mvn test
+
+   If some tests fail, this library may not work correctly on your
+   system.  Continue at your own risk.
+
+4) Install the library into your Maven repository:
+
+     $ mvn install
+
+5) If you do not use Maven to manage your own build, you can build a
+   .jar file to use:
+
+     $ mvn package
+
+   The .jar will be placed in the "target" directory.
+
+Installation - Without Maven
+============================
+
+If you would rather not install Maven to build the library, you may
+follow these instructions instead.  Note that these instructions skip
+running unit tests.
+
+1) Build the C++ code, or obtain a binary distribution of protoc.  If
+   you install a binary distribution, make sure that it is the same
+   version as this package.  If in doubt, run:
+
+     $ protoc --version
+
+   If you built the C++ code without installing, the compiler binary
+   should be located in ../src.
+
+2) Invoke protoc to build DescriptorProtos.java:
+
+     $ protoc --java_out=src/main/java -I../src \
+         ../src/google/protobuf/descriptor.proto
+
+3) Compile the code in src/main/java using whatever means you prefer.
+
+4) Install the classes wherever you prefer.
+
+Nano version
+============================
+
+Nano is a special code generator and runtime library designed specially
+for Android, and is very resource-friendly in both the amount of code
+and the runtime overhead. An overview of Nano features:
+
+- No descriptors or message builders.
+- All messages are mutable; fields are public Java fields.
+- For optional fields only, encapsulation behind setter/getter/hazzer/
+  clearer functions is opt-in, which provide proper 'has' state support.
+- If not opted in, has state is not available. Serialization outputs
+  all fields not equal to their defaults (see important implications
+  below).
+- Required fields are always serialized.
+- Enum constants are integers; protection against invalid values only
+  when parsing from the wire.
+- Enum constants can be generated into container interfaces bearing
+  the enum's name (so the referencing code is in Java style).
+- CodedInputByteBufferNano can only take byte[] (not InputStream).
+- Similarly CodedOutputByteBufferNano can only write to byte[].
+- Repeated fields are in arrays, not ArrayList or Vector. Null array
+  elements are allowed and silently ignored.
+- Full support of serializing/deserializing repeated packed fields.
+- Support of extensions.
+- Unset messages/groups are null, not an immutable empty default
+  instance.
+- toByteArray(...) and mergeFrom(...) are now static functions of
+  MessageNano.
+- The 'bytes' type translates to the Java type byte[].
+
+The generated messages are not thread-safe for writes, but may be
+used simultaneously from multiple threads in a read-only manner.
+In other words, an appropriate synchronization mechanism (such as
+a ReadWriteLock) must be used to ensure that a message, its
+ancestors, and descendants are not accessed by any other threads
+while the message is being modified. Field reads, getter methods
+(but not getExtension(...)), toByteArray(...), writeTo(...),
+getCachedSize(), and getSerializedSize() are all considered read-only
+operations.
+
+IMPORTANT: If you have fields with defaults and opt out of accessors
+
+How fields with defaults are serialized has changed. Because we don't
+keep "has" state, any field equal to its default is assumed to be not
+set and therefore is not serialized. Consider the situation where we
+change the default value of a field. Senders compiled against an older
+version of the proto continue to match against the old default, and
+don't send values to the receiver even though the receiver assumes the
+new default value. Therefore, think carefully about the implications
+of changing the default value. Alternatively, turn on accessors and
+enjoy the benefit of the explicit has() checks.
+
+IMPORTANT: If you have "bytes" fields with non-empty defaults
+
+Because the byte buffer is now of mutable type byte[], the default
+static final cannot be exposed through a public field. Each time a
+message's constructor or clear() function is called, the default value
+(kept in a private byte[]) is cloned. This causes a small memory
+penalty. This is not a problem if the field has no default or is an
+empty default.
+
+Nano Generator options
+
+java_package           -> <file-name>|<package-name>
+java_outer_classname   -> <file-name>|<package-name>
+java_multiple_files    -> true or false
+java_nano_generate_has -> true or false [DEPRECATED]
+optional_field_style   -> default or accessors
+enum_style             -> c or java
+ignore_services        -> true or false
+parcelable_messages    -> true or false
+
+java_package=<file-name>|<package-name> (no default)
+  This allows overriding the 'java_package' option value
+  for the given file from the command line. Use multiple
+  java_package options to override the option for multiple
+  files. The final Java package for each file is the value
+  of this command line option if present, or the value of
+  the same option defined in the file if present, or the
+  proto package if present, or the default Java package.
+
+java_outer_classname=<file-name>|<outer-classname> (no default)
+  This allows overriding the 'java_outer_classname' option
+  for the given file from the command line. Use multiple
+  java_outer_classname options to override the option for
+  multiple files. The final Java outer class name for each
+  file is the value of this command line option if present,
+  or the value of the same option defined in the file if
+  present, or the file name converted to CamelCase. This
+  outer class will nest all classes and integer constants
+  generated from file-scope messages and enums.
+
+java_multiple_files={true,false} (no default)
+  This allows overriding the 'java_multiple_files' option
+  in all source files and their imported files from the
+  command line. The final value of this option for each
+  file is the value defined in this command line option, or
+  the value of the same option defined in the file if
+  present, or false. This specifies whether to generate
+  package-level classes for the file-scope messages in the
+  same Java package as the outer class (instead of nested
+  classes in the outer class). File-scope enum constants
+  are still generated as integer constants in the outer
+  class. This affects the fully qualified references in the
+  Java code. NOTE: because the command line option
+  overrides the value for all files and their imported
+  files, using this option inconsistently may result in
+  incorrect references to the imported messages and enum
+  constants.
+
+java_nano_generate_has={true,false} (default: false)
+  DEPRECATED. Use optional_field_style=accessors.
+
+  If true, generates a public boolean variable has<fieldname>
+  accompanying each optional or required field (not present for
+  repeated fields, groups or messages). It is set to false initially
+  and upon clear(). If parseFrom(...) reads the field from the wire,
+  it is set to true. This is a way for clients to inspect the "has"
+  value upon parse. If it is set to true, writeTo(...) will ALWAYS
+  output that field (even if field value is equal to its
+  default).
+
+  IMPORTANT: This option costs an extra 4 bytes per primitive field in
+  the message. Think carefully about whether you really need this. In
+  many cases reading the default works and determining whether the
+  field was received over the wire is irrelevant.
+
+optional_field_style={default,accessors,reftypes} (default: default)
+  Defines the style of the generated code for fields.
+
+  * default *
+
+  In the default style, optional fields translate into public mutable
+  Java fields, and the serialization process is as discussed in the
+  "IMPORTANT" section above. 
+
+  * accessors *
+
+  When set to 'accessors', each optional field is encapsulated behind
+  4 accessors, namely get<fieldname>(), set<fieldname>(), has<fieldname>()
+  and clear<fieldname>() methods, with the standard semantics. The hazzer's
+  return value determines whether a field is serialized, so this style is
+  useful when you need to serialize a field with the default value, or check
+  if a field has been explicitly set to its default value from the wire.
+
+  In the 'accessors' style, required and nested message fields are still
+  translated to one public mutable Java field each, repeated fields are still
+  translated to arrays. No accessors are generated for them.
+
+  IMPORTANT: When using the 'accessors' style, ProGuard should always
+  be enabled with optimization (don't use -dontoptimize) and allowing
+  access modification (use -allowaccessmodification). This removes the
+  unused accessors and maybe inline the rest at the call sites,
+  reducing the final code size.
+  TODO(maxtroy): find ProGuard config that would work the best.
+
+  * reftypes *
+
+  When set to 'reftypes', each proto field is generated as a public Java
+  field. For primitive types, these fields use the Java reference types
+  such as java.lang.Integer instead of primitive types such as int.
+
+  In the 'reftypes' style, fields are initialized to null (or empty
+  arrays for repeated fields), and their default values are not available.
+  They are serialized over the wire based on equality to null.
+
+  The 'reftypes' mode has some additional cost due to autoboxing and usage
+  of reference types. In practice, many boxed types are cached, and so don't
+  result in object creation. However, references do take slightly more memory
+  than primitives.
+
+  The 'reftypes' mode is useful when you want to be able to serialize fields
+  with default values, or check if a field has been explicitly set to the
+  default over the wire without paying the extra method cost of the
+  'accessors' mode.
+
+  Note that if you attempt to write null to a required field in the reftypes
+  mode, serialization of the proto will cause a NullPointerException. This is
+  an intentional indicator that you must set required fields.
+
+  NOTE
+  optional_field_style=accessors or reftypes cannot be used together with
+  java_nano_generate_has=true. If you need the 'has' flag for any
+  required field (you have no reason to), you can only use
+  java_nano_generate_has=true.
+
+enum_style={c,java} (default: c)
+  Defines where to put the int constants generated from enum members.
+
+  * c *
+
+  Use C-style, so the enum constants are available at the scope where
+  the enum is defined. A file-scope enum's members are referenced like
+  'FileOuterClass.ENUM_VALUE'; a message-scope enum's members are
+  referenced as 'Message.ENUM_VALUE'. The enum name is unavailable.
+  This complies with the Micro code generator's behavior.
+
+  * java *
+
+  Use Java-style, so the enum constants are available under the enum
+  name and referenced like 'EnumName.ENUM_VALUE' (they are still int
+  constants). The enum name becomes the name of a public interface, at
+  the scope where the enum is defined. If the enum is file-scope and
+  the java_multiple_files option is on, the interface will be defined
+  in its own file. To reduce code size, this interface should not be
+  implemented and ProGuard shrinking should be used, so after the Java
+  compiler inlines all referenced enum constants into the call sites,
+  the interface remains unused and can be removed by ProGuard.
+
+ignore_services={true,false} (default: false)
+  Skips services definitions.
+
+  Nano doesn't support services. By default, if a service is defined
+  it will generate a compilation error. If this flag is set to true,
+  services will be silently ignored, instead.
+
+parcelable_messages={true,false} (default: false)
+  Android-specific option to generate Parcelable messages.
+
+
+To use nano protobufs within the Android repo:
+
+- Set 'LOCAL_PROTOC_OPTIMIZE_TYPE := nano' in your local .mk file.
+  When building a Java library or an app (package) target, the build
+  system will add the Java nano runtime library to the
+  LOCAL_STATIC_JAVA_LIBRARIES variable, so you don't need to.
+- Set 'LOCAL_PROTO_JAVA_OUTPUT_PARAMS := ...' in your local .mk file
+  for any command-line options you need. Use commas to join multiple
+  options. In the nano flavor only, whitespace surrounding the option
+  names and values are ignored, so you can use backslash-newline or
+  '+=' to structure your make files nicely.
+- The options will be applied to *all* proto files in LOCAL_SRC_FILES
+  when you build a Java library or package. In case different options
+  are needed for different proto files, build separate Java libraries
+  and reference them in your main target. Note: you should make sure
+  that, for each separate target, all proto files imported from any
+  proto file in LOCAL_SRC_FILES are included in LOCAL_SRC_FILES. This
+  is because the generator has to assume that the imported files are
+  built using the same options, and will generate code that reference
+  the fields and enums from the imported files using the same code
+  style.
+- Hint: 'include $(CLEAR_VARS)' resets all LOCAL_ variables, including
+  the two above.
+
+To use nano protobufs outside of Android repo:
+
+- Link with the generated jar file
+  <protobuf-root>java/target/protobuf-java-2.3.0-nano.jar.
+- Invoke with --javanano_out, e.g.:
+
+./protoc '--javanano_out=\
+    java_package=src/proto/simple-data.proto|my_package,\
+    java_outer_classname=src/proto/simple-data.proto|OuterName\
+  :.' src/proto/simple-data.proto
+
+Contributing to nano:
+
+Please add/edit tests in NanoTest.java.
+
+Please run the following steps to test:
+
+- cd external/protobuf
+- ./configure
+- Run "make -j12 check" and verify all tests pass.
+- cd java
+- Run "mvn test" and verify all tests pass.
+- cd ../../..
+- . build/envsetup.sh
+- lunch 1
+- "make -j12 aprotoc libprotobuf-java-2.3.0-nano aprotoc-test-nano-params NanoAndroidTest" and
+  check for build errors.
+- Plug in an Android device or start an emulator.
+- adb install -r out/target/product/generic/data/app/NanoAndroidTest.apk
+- Run:
+  "adb shell am instrument -w com.google.protobuf.nano.test/android.test.InstrumentationTestRunner"
+  and verify all tests pass.
+- repo sync -c -j256
+- "make -j12" and check for build errors
+
+Usage
+=====
+
+The complete documentation for Protocol Buffers is available via the
+web at:
+
+    https://developers.google.com/protocol-buffers/

javanano/pom.xml

@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.google</groupId>
+    <artifactId>google</artifactId>
+    <version>1</version>
+  </parent>
+  <groupId>com.google.protobuf.nano</groupId>
+  <artifactId>protobuf-javanano</artifactId>
+  <version>2.6.2-pre</version>
+  <packaging>bundle</packaging>
+  <name>Protocol Buffer JavaNano API</name>
+  <description>
+    Protocol Buffers are a way of encoding structured data in an efficient yet
+    extensible format.
+  </description>
+  <inceptionYear>2008</inceptionYear>
+  <url>https://developers.google.com/protocol-buffers/</url>
+  <licenses>
+    <license>
+      <name>New BSD license</name>
+      <url>http://www.opensource.org/licenses/bsd-license.php</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  <scm>
+    <url>https://github.com/google/protobuf</url>
+    <connection>
+      scm:git:https://github.com/google/protobuf.git
+    </connection>
+  </scm>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.4</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.easymock</groupId>
+      <artifactId>easymock</artifactId>
+      <version>2.2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.easymock</groupId>
+      <artifactId>easymockclassextension</artifactId>
+      <version>2.2.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.5</source>
+          <target>1.5</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <includes>
+            <include>**/*Test.java</include>
+          </includes>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>generate-test-sources</id>
+            <phase>generate-test-sources</phase>
+            <configuration>
+              <tasks>
+                <mkdir dir="target/generated-test-sources" />
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=generate_equals=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_import_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_single_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=store_unknown_fields=true,generate_equals=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=store_unknown_fields=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=java_nano_generate_has=true,generate_equals=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_has_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=optional_field_style=accessors,generate_equals=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=enum_style=java:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=
+                                  optional_field_style=accessors,
+                                  java_outer_classname=google/protobuf/nano/unittest_enum_validity_nano.proto|EnumValidityAccessors
+                                :target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto" />
+                </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=optional_field_style=reftypes,generate_equals=true:target/generated-test-sources" />
+                  <arg value="--proto_path=src/test/java/com" />
+                  <arg value="src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto" />
+                </exec>
+              </tasks>
+              <testSourceRoot>target/generated-test-sources</testSourceRoot>
+            </configuration>
+            <goals>
+              <goal>run</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <extensions>true</extensions>
+        <configuration>
+          <instructions>
+            <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
+            <Bundle-SymbolicName>com.google.protobuf</Bundle-SymbolicName>
+            <Export-Package>com.google.protobuf;version=2.6.2-pre</Export-Package>
+          </instructions>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java

@@ -0,0 +1,641 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+
+/**
+ * Reads and decodes protocol message fields.
+ *
+ * This class contains two kinds of methods:  methods that read specific
+ * protocol message constructs and field types (e.g. {@link #readTag()} and
+ * {@link #readInt32()}) and methods that read low-level values (e.g.
+ * {@link #readRawVarint32()} and {@link #readRawBytes}).  If you are reading
+ * encoded protocol messages, you should use the former methods, but if you are
+ * reading some other format of your own design, use the latter.
+ *
+ * @author kenton@google.com Kenton Varda
+ */
+public final class CodedInputByteBufferNano {
+  /**
+   * Create a new CodedInputStream wrapping the given byte array.
+   */
+  public static CodedInputByteBufferNano newInstance(final byte[] buf) {
+    return newInstance(buf, 0, buf.length);
+  }
+
+  /**
+   * Create a new CodedInputStream wrapping the given byte array slice.
+   */
+  public static CodedInputByteBufferNano newInstance(final byte[] buf, final int off,
+                                             final int len) {
+    return new CodedInputByteBufferNano(buf, off, len);
+  }
+
+  // -----------------------------------------------------------------
+
+  /**
+   * Attempt to read a field tag, returning zero if we have reached EOF.
+   * Protocol message parsers use this to read tags, since a protocol message
+   * may legally end wherever a tag occurs, and zero is not a valid tag number.
+   */
+  public int readTag() throws IOException {
+    if (isAtEnd()) {
+      lastTag = 0;
+      return 0;
+    }
+
+    lastTag = readRawVarint32();
+    if (lastTag == 0) {
+      // If we actually read zero, that's not a valid tag.
+      throw InvalidProtocolBufferNanoException.invalidTag();
+    }
+    return lastTag;
+  }
+
+  /**
+   * Verifies that the last call to readTag() returned the given tag value.
+   * This is used to verify that a nested group ended with the correct
+   * end tag.
+   *
+   * @throws InvalidProtocolBufferNanoException {@code value} does not match the
+   *                                        last tag.
+   */
+  public void checkLastTagWas(final int value)
+                              throws InvalidProtocolBufferNanoException {
+    if (lastTag != value) {
+      throw InvalidProtocolBufferNanoException.invalidEndTag();
+    }
+  }
+
+  /**
+   * Reads and discards a single field, given its tag value.
+   *
+   * @return {@code false} if the tag is an endgroup tag, in which case
+   *         nothing is skipped.  Otherwise, returns {@code true}.
+   */
+  public boolean skipField(final int tag) throws IOException {
+    switch (WireFormatNano.getTagWireType(tag)) {
+      case WireFormatNano.WIRETYPE_VARINT:
+        readInt32();
+        return true;
+      case WireFormatNano.WIRETYPE_FIXED64:
+        readRawLittleEndian64();
+        return true;
+      case WireFormatNano.WIRETYPE_LENGTH_DELIMITED:
+        skipRawBytes(readRawVarint32());
+        return true;
+      case WireFormatNano.WIRETYPE_START_GROUP:
+        skipMessage();
+        checkLastTagWas(
+          WireFormatNano.makeTag(WireFormatNano.getTagFieldNumber(tag),
+                             WireFormatNano.WIRETYPE_END_GROUP));
+        return true;
+      case WireFormatNano.WIRETYPE_END_GROUP:
+        return false;
+      case WireFormatNano.WIRETYPE_FIXED32:
+        readRawLittleEndian32();
+        return true;
+      default:
+        throw InvalidProtocolBufferNanoException.invalidWireType();
+    }
+  }
+
+  /**
+   * Reads and discards an entire message.  This will read either until EOF
+   * or until an endgroup tag, whichever comes first.
+   */
+  public void skipMessage() throws IOException {
+    while (true) {
+      final int tag = readTag();
+      if (tag == 0 || !skipField(tag)) {
+        return;
+      }
+    }
+  }
+
+  // -----------------------------------------------------------------
+
+  /** Read a {@code double} field value from the stream. */
+  public double readDouble() throws IOException {
+    return Double.longBitsToDouble(readRawLittleEndian64());
+  }
+
+  /** Read a {@code float} field value from the stream. */
+  public float readFloat() throws IOException {
+    return Float.intBitsToFloat(readRawLittleEndian32());
+  }
+
+  /** Read a {@code uint64} field value from the stream. */
+  public long readUInt64() throws IOException {
+    return readRawVarint64();
+  }
+
+  /** Read an {@code int64} field value from the stream. */
+  public long readInt64() throws IOException {
+    return readRawVarint64();
+  }
+
+  /** Read an {@code int32} field value from the stream. */
+  public int readInt32() throws IOException {
+    return readRawVarint32();
+  }
+
+  /** Read a {@code fixed64} field value from the stream. */
+  public long readFixed64() throws IOException {
+    return readRawLittleEndian64();
+  }
+
+  /** Read a {@code fixed32} field value from the stream. */
+  public int readFixed32() throws IOException {
+    return readRawLittleEndian32();
+  }
+
+  /** Read a {@code bool} field value from the stream. */
+  public boolean readBool() throws IOException {
+    return readRawVarint32() != 0;
+  }
+
+  /** Read a {@code string} field value from the stream. */
+  public String readString() throws IOException {
+    final int size = readRawVarint32();
+    if (size <= (bufferSize - bufferPos) && size > 0) {
+      // Fast path:  We already have the bytes in a contiguous buffer, so
+      //   just copy directly from it.
+      final String result = new String(buffer, bufferPos, size, "UTF-8");
+      bufferPos += size;
+      return result;
+    } else {
+      // Slow path:  Build a byte array first then copy it.
+      return new String(readRawBytes(size), "UTF-8");
+    }
+  }
+
+  /** Read a {@code group} field value from the stream. */
+  public void readGroup(final MessageNano msg, final int fieldNumber)
+      throws IOException {
+    if (recursionDepth >= recursionLimit) {
+      throw InvalidProtocolBufferNanoException.recursionLimitExceeded();
+    }
+    ++recursionDepth;
+    msg.mergeFrom(this);
+    checkLastTagWas(
+      WireFormatNano.makeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP));
+    --recursionDepth;
+  }
+
+  public void readMessage(final MessageNano msg)
+      throws IOException {
+    final int length = readRawVarint32();
+    if (recursionDepth >= recursionLimit) {
+      throw InvalidProtocolBufferNanoException.recursionLimitExceeded();
+    }
+    final int oldLimit = pushLimit(length);
+    ++recursionDepth;
+    msg.mergeFrom(this);
+    checkLastTagWas(0);
+    --recursionDepth;
+    popLimit(oldLimit);
+  }
+
+  /** Read a {@code bytes} field value from the stream. */
+  public byte[] readBytes() throws IOException {
+    final int size = readRawVarint32();
+    if (size <= (bufferSize - bufferPos) && size > 0) {
+      // Fast path:  We already have the bytes in a contiguous buffer, so
+      //   just copy directly from it.
+      final byte[] result = new byte[size];
+      System.arraycopy(buffer, bufferPos, result, 0, size);
+      bufferPos += size;
+      return result;
+    } else {
+      // Slow path:  Build a byte array first then copy it.
+      return readRawBytes(size);
+    }
+  }
+
+  /** Read a {@code uint32} field value from the stream. */
+  public int readUInt32() throws IOException {
+    return readRawVarint32();
+  }
+
+  /**
+   * Read an enum field value from the stream.  Caller is responsible
+   * for converting the numeric value to an actual enum.
+   */
+  public int readEnum() throws IOException {
+    return readRawVarint32();
+  }
+
+  /** Read an {@code sfixed32} field value from the stream. */
+  public int readSFixed32() throws IOException {
+    return readRawLittleEndian32();
+  }
+
+  /** Read an {@code sfixed64} field value from the stream. */
+  public long readSFixed64() throws IOException {
+    return readRawLittleEndian64();
+  }
+
+  /** Read an {@code sint32} field value from the stream. */
+  public int readSInt32() throws IOException {
+    return decodeZigZag32(readRawVarint32());
+  }
+
+  /** Read an {@code sint64} field value from the stream. */
+  public long readSInt64() throws IOException {
+    return decodeZigZag64(readRawVarint64());
+  }
+
+  // =================================================================
+
+  /**
+   * Read a raw Varint from the stream.  If larger than 32 bits, discard the
+   * upper bits.
+   */
+  public int readRawVarint32() throws IOException {
+    byte tmp = readRawByte();
+    if (tmp >= 0) {
+      return tmp;
+    }
+    int result = tmp & 0x7f;
+    if ((tmp = readRawByte()) >= 0) {
+      result |= tmp << 7;
+    } else {
+      result |= (tmp & 0x7f) << 7;
+      if ((tmp = readRawByte()) >= 0) {
+        result |= tmp << 14;
+      } else {
+        result |= (tmp & 0x7f) << 14;
+        if ((tmp = readRawByte()) >= 0) {
+          result |= tmp << 21;
+        } else {
+          result |= (tmp & 0x7f) << 21;
+          result |= (tmp = readRawByte()) << 28;
+          if (tmp < 0) {
+            // Discard upper 32 bits.
+            for (int i = 0; i < 5; i++) {
+              if (readRawByte() >= 0) {
+                return result;
+              }
+            }
+            throw InvalidProtocolBufferNanoException.malformedVarint();
+          }
+        }
+      }
+    }
+    return result;
+  }
+
+  /** Read a raw Varint from the stream. */
+  public long readRawVarint64() throws IOException {
+    int shift = 0;
+    long result = 0;
+    while (shift < 64) {
+      final byte b = readRawByte();
+      result |= (long)(b & 0x7F) << shift;
+      if ((b & 0x80) == 0) {
+        return result;
+      }
+      shift += 7;
+    }
+    throw InvalidProtocolBufferNanoException.malformedVarint();
+  }
+
+  /** Read a 32-bit little-endian integer from the stream. */
+  public int readRawLittleEndian32() throws IOException {
+    final byte b1 = readRawByte();
+    final byte b2 = readRawByte();
+    final byte b3 = readRawByte();
+    final byte b4 = readRawByte();
+    return ((b1 & 0xff)      ) |
+           ((b2 & 0xff) <<  8) |
+           ((b3 & 0xff) << 16) |
+           ((b4 & 0xff) << 24);
+  }
+
+  /** Read a 64-bit little-endian integer from the stream. */
+  public long readRawLittleEndian64() throws IOException {
+    final byte b1 = readRawByte();
+    final byte b2 = readRawByte();
+    final byte b3 = readRawByte();
+    final byte b4 = readRawByte();
+    final byte b5 = readRawByte();
+    final byte b6 = readRawByte();
+    final byte b7 = readRawByte();
+    final byte b8 = readRawByte();
+    return (((long)b1 & 0xff)      ) |
+           (((long)b2 & 0xff) <<  8) |
+           (((long)b3 & 0xff) << 16) |
+           (((long)b4 & 0xff) << 24) |
+           (((long)b5 & 0xff) << 32) |
+           (((long)b6 & 0xff) << 40) |
+           (((long)b7 & 0xff) << 48) |
+           (((long)b8 & 0xff) << 56);
+  }
+
+  /**
+   * Decode a ZigZag-encoded 32-bit value.  ZigZag encodes signed integers
+   * into values that can be efficiently encoded with varint.  (Otherwise,
+   * negative values must be sign-extended to 64 bits to be varint encoded,
+   * thus always taking 10 bytes on the wire.)
+   *
+   * @param n An unsigned 32-bit integer, stored in a signed int because
+   *          Java has no explicit unsigned support.
+   * @return A signed 32-bit integer.
+   */
+  public static int decodeZigZag32(final int n) {
+    return (n >>> 1) ^ -(n & 1);
+  }
+
+  /**
+   * Decode a ZigZag-encoded 64-bit value.  ZigZag encodes signed integers
+   * into values that can be efficiently encoded with varint.  (Otherwise,
+   * negative values must be sign-extended to 64 bits to be varint encoded,
+   * thus always taking 10 bytes on the wire.)
+   *
+   * @param n An unsigned 64-bit integer, stored in a signed int because
+   *          Java has no explicit unsigned support.
+   * @return A signed 64-bit integer.
+   */
+  public static long decodeZigZag64(final long n) {
+    return (n >>> 1) ^ -(n & 1);
+  }
+
+  // -----------------------------------------------------------------
+
+  private final byte[] buffer;
+  private int bufferStart;
+  private int bufferSize;
+  private int bufferSizeAfterLimit;
+  private int bufferPos;
+  private int lastTag;
+
+  /** The absolute position of the end of the current message. */
+  private int currentLimit = Integer.MAX_VALUE;
+
+  /** See setRecursionLimit() */
+  private int recursionDepth;
+  private int recursionLimit = DEFAULT_RECURSION_LIMIT;
+
+  /** See setSizeLimit() */
+  private int sizeLimit = DEFAULT_SIZE_LIMIT;
+
+  private static final int DEFAULT_RECURSION_LIMIT = 64;
+  private static final int DEFAULT_SIZE_LIMIT = 64 << 20;  // 64MB
+
+  private CodedInputByteBufferNano(final byte[] buffer, final int off, final int len) {
+    this.buffer = buffer;
+    bufferStart = off;
+    bufferSize = off + len;
+    bufferPos = off;
+  }
+
+  /**
+   * Set the maximum message recursion depth.  In order to prevent malicious
+   * messages from causing stack overflows, {@code CodedInputStream} limits
+   * how deeply messages may be nested.  The default limit is 64.
+   *
+   * @return the old limit.
+   */
+  public int setRecursionLimit(final int limit) {
+    if (limit < 0) {
+      throw new IllegalArgumentException(
+        "Recursion limit cannot be negative: " + limit);
+    }
+    final int oldLimit = recursionLimit;
+    recursionLimit = limit;
+    return oldLimit;
+  }
+
+  /**
+   * Set the maximum message size.  In order to prevent malicious
+   * messages from exhausting memory or causing integer overflows,
+   * {@code CodedInputStream} limits how large a message may be.
+   * The default limit is 64MB.  You should set this limit as small
+   * as you can without harming your app's functionality.  Note that
+   * size limits only apply when reading from an {@code InputStream}, not
+   * when constructed around a raw byte array.
+   * <p>
+   * If you want to read several messages from a single CodedInputStream, you
+   * could call {@link #resetSizeCounter()} after each one to avoid hitting the
+   * size limit.
+   *
+   * @return the old limit.
+   */
+  public int setSizeLimit(final int limit) {
+    if (limit < 0) {
+      throw new IllegalArgumentException(
+        "Size limit cannot be negative: " + limit);
+    }
+    final int oldLimit = sizeLimit;
+    sizeLimit = limit;
+    return oldLimit;
+  }
+
+  /**
+   * Resets the current size counter to zero (see {@link #setSizeLimit(int)}).
+   */
+  public void resetSizeCounter() {
+  }
+
+  /**
+   * Sets {@code currentLimit} to (current position) + {@code byteLimit}.  This
+   * is called when descending into a length-delimited embedded message.
+   *
+   * @return the old limit.
+   */
+  public int pushLimit(int byteLimit) throws InvalidProtocolBufferNanoException {
+    if (byteLimit < 0) {
+      throw InvalidProtocolBufferNanoException.negativeSize();
+    }
+    byteLimit += bufferPos;
+    final int oldLimit = currentLimit;
+    if (byteLimit > oldLimit) {
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+    currentLimit = byteLimit;
+
+    recomputeBufferSizeAfterLimit();
+
+    return oldLimit;
+  }
+
+  private void recomputeBufferSizeAfterLimit() {
+    bufferSize += bufferSizeAfterLimit;
+    final int bufferEnd = bufferSize;
+    if (bufferEnd > currentLimit) {
+      // Limit is in current buffer.
+      bufferSizeAfterLimit = bufferEnd - currentLimit;
+      bufferSize -= bufferSizeAfterLimit;
+    } else {
+      bufferSizeAfterLimit = 0;
+    }
+  }
+
+  /**
+   * Discards the current limit, returning to the previous limit.
+   *
+   * @param oldLimit The old limit, as returned by {@code pushLimit}.
+   */
+  public void popLimit(final int oldLimit) {
+    currentLimit = oldLimit;
+    recomputeBufferSizeAfterLimit();
+  }
+
+  /**
+   * Returns the number of bytes to be read before the current limit.
+   * If no limit is set, returns -1.
+   */
+  public int getBytesUntilLimit() {
+    if (currentLimit == Integer.MAX_VALUE) {
+      return -1;
+    }
+
+    final int currentAbsolutePosition = bufferPos;
+    return currentLimit - currentAbsolutePosition;
+  }
+
+  /**
+   * Returns true if the stream has reached the end of the input.  This is the
+   * case if either the end of the underlying input source has been reached or
+   * if the stream has reached a limit created using {@link #pushLimit(int)}.
+   */
+  public boolean isAtEnd() {
+    return bufferPos == bufferSize;
+  }
+
+  /**
+   * Get current position in buffer relative to beginning offset.
+   */
+  public int getPosition() {
+    return bufferPos - bufferStart;
+  }
+
+  /**
+   * Retrieves a subset of data in the buffer. The returned array is not backed by the original
+   * buffer array.
+   *
+   * @param offset the position (relative to the buffer start position) to start at.
+   * @param length the number of bytes to retrieve.
+   */
+  public byte[] getData(int offset, int length) {
+    if (length == 0) {
+      return WireFormatNano.EMPTY_BYTES;
+    }
+    byte[] copy = new byte[length];
+    int start = bufferStart + offset;
+    System.arraycopy(buffer, start, copy, 0, length);
+    return copy;
+  }
+
+  /**
+   * Rewind to previous position. Cannot go forward.
+   */
+  public void rewindToPosition(int position) {
+    if (position > bufferPos - bufferStart) {
+      throw new IllegalArgumentException(
+              "Position " + position + " is beyond current " + (bufferPos - bufferStart));
+    }
+    if (position < 0) {
+      throw new IllegalArgumentException("Bad position " + position);
+    }
+    bufferPos = bufferStart + position;
+  }
+
+  /**
+   * Read one byte from the input.
+   *
+   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
+   *                                        limit was reached.
+   */
+  public byte readRawByte() throws IOException {
+    if (bufferPos == bufferSize) {
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+    return buffer[bufferPos++];
+  }
+
+  /**
+   * Read a fixed size of bytes from the input.
+   *
+   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
+   *                                        limit was reached.
+   */
+  public byte[] readRawBytes(final int size) throws IOException {
+    if (size < 0) {
+      throw InvalidProtocolBufferNanoException.negativeSize();
+    }
+
+    if (bufferPos + size > currentLimit) {
+      // Read to the end of the stream anyway.
+      skipRawBytes(currentLimit - bufferPos);
+      // Then fail.
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+
+    if (size <= bufferSize - bufferPos) {
+      // We have all the bytes we need already.
+      final byte[] bytes = new byte[size];
+      System.arraycopy(buffer, bufferPos, bytes, 0, size);
+      bufferPos += size;
+      return bytes;
+    } else {
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+  }
+
+  /**
+   * Reads and discards {@code size} bytes.
+   *
+   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
+   *                                        limit was reached.
+   */
+  public void skipRawBytes(final int size) throws IOException {
+    if (size < 0) {
+      throw InvalidProtocolBufferNanoException.negativeSize();
+    }
+
+    if (bufferPos + size > currentLimit) {
+      // Read to the end of the stream anyway.
+      skipRawBytes(currentLimit - bufferPos);
+      // Then fail.
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+
+    if (size <= bufferSize - bufferPos) {
+      // We have all the bytes we need already.
+      bufferPos += size;
+    } else {
+      throw InvalidProtocolBufferNanoException.truncatedMessage();
+    }
+  }
+}

javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java

@@ -0,0 +1,879 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Encodes and writes protocol message fields.
+ *
+ * <p>This class contains two kinds of methods:  methods that write specific
+ * protocol message constructs and field types (e.g. {@link #writeTag} and
+ * {@link #writeInt32}) and methods that write low-level values (e.g.
+ * {@link #writeRawVarint32} and {@link #writeRawBytes}).  If you are
+ * writing encoded protocol messages, you should use the former methods, but if
+ * you are writing some other format of your own design, use the latter.
+ *
+ * <p>This class is totally unsynchronized.
+ *
+ * @author kneton@google.com Kenton Varda
+ */
+public final class CodedOutputByteBufferNano {
+  private final byte[] buffer;
+  private final int limit;
+  private int position;
+
+  private CodedOutputByteBufferNano(final byte[] buffer, final int offset,
+                            final int length) {
+    this.buffer = buffer;
+    position = offset;
+    limit = offset + length;
+  }
+
+  /**
+   * Create a new {@code CodedOutputStream} that writes directly to the given
+   * byte array.  If more bytes are written than fit in the array,
+   * {@link OutOfSpaceException} will be thrown.  Writing directly to a flat
+   * array is faster than writing to an {@code OutputStream}.
+   */
+  public static CodedOutputByteBufferNano newInstance(final byte[] flatArray) {
+    return newInstance(flatArray, 0, flatArray.length);
+  }
+
+  /**
+   * Create a new {@code CodedOutputStream} that writes directly to the given
+   * byte array slice.  If more bytes are written than fit in the slice,
+   * {@link OutOfSpaceException} will be thrown.  Writing directly to a flat
+   * array is faster than writing to an {@code OutputStream}.
+   */
+  public static CodedOutputByteBufferNano newInstance(final byte[] flatArray,
+                                              final int offset,
+                                              final int length) {
+    return new CodedOutputByteBufferNano(flatArray, offset, length);
+  }
+
+  // -----------------------------------------------------------------
+
+  /** Write a {@code double} field, including tag, to the stream. */
+  public void writeDouble(final int fieldNumber, final double value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
+    writeDoubleNoTag(value);
+  }
+
+  /** Write a {@code float} field, including tag, to the stream. */
+  public void writeFloat(final int fieldNumber, final float value)
+                         throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
+    writeFloatNoTag(value);
+  }
+
+  /** Write a {@code uint64} field, including tag, to the stream. */
+  public void writeUInt64(final int fieldNumber, final long value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeUInt64NoTag(value);
+  }
+
+  /** Write an {@code int64} field, including tag, to the stream. */
+  public void writeInt64(final int fieldNumber, final long value)
+                         throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeInt64NoTag(value);
+  }
+
+  /** Write an {@code int32} field, including tag, to the stream. */
+  public void writeInt32(final int fieldNumber, final int value)
+                         throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeInt32NoTag(value);
+  }
+
+  /** Write a {@code fixed64} field, including tag, to the stream. */
+  public void writeFixed64(final int fieldNumber, final long value)
+                           throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
+    writeFixed64NoTag(value);
+  }
+
+  /** Write a {@code fixed32} field, including tag, to the stream. */
+  public void writeFixed32(final int fieldNumber, final int value)
+                           throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
+    writeFixed32NoTag(value);
+  }
+
+  /** Write a {@code bool} field, including tag, to the stream. */
+  public void writeBool(final int fieldNumber, final boolean value)
+                        throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeBoolNoTag(value);
+  }
+
+  /** Write a {@code string} field, including tag, to the stream. */
+  public void writeString(final int fieldNumber, final String value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
+    writeStringNoTag(value);
+  }
+
+  /** Write a {@code group} field, including tag, to the stream. */
+  public void writeGroup(final int fieldNumber, final MessageNano value)
+                         throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_START_GROUP);
+    writeGroupNoTag(value);
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP);
+  }
+
+  /** Write an embedded message field, including tag, to the stream. */
+  public void writeMessage(final int fieldNumber, final MessageNano value)
+                           throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
+    writeMessageNoTag(value);
+  }
+
+  /** Write a {@code bytes} field, including tag, to the stream. */
+  public void writeBytes(final int fieldNumber, final byte[] value)
+                         throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
+    writeBytesNoTag(value);
+  }
+
+  /** Write a {@code uint32} field, including tag, to the stream. */
+  public void writeUInt32(final int fieldNumber, final int value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeUInt32NoTag(value);
+  }
+
+  /**
+   * Write an enum field, including tag, to the stream.  Caller is responsible
+   * for converting the enum value to its numeric value.
+   */
+  public void writeEnum(final int fieldNumber, final int value)
+                        throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeEnumNoTag(value);
+  }
+
+  /** Write an {@code sfixed32} field, including tag, to the stream. */
+  public void writeSFixed32(final int fieldNumber, final int value)
+                            throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
+    writeSFixed32NoTag(value);
+  }
+
+  /** Write an {@code sfixed64} field, including tag, to the stream. */
+  public void writeSFixed64(final int fieldNumber, final long value)
+                            throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
+    writeSFixed64NoTag(value);
+  }
+
+  /** Write an {@code sint32} field, including tag, to the stream. */
+  public void writeSInt32(final int fieldNumber, final int value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeSInt32NoTag(value);
+  }
+
+  /** Write an {@code sint64} field, including tag, to the stream. */
+  public void writeSInt64(final int fieldNumber, final long value)
+                          throws IOException {
+    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
+    writeSInt64NoTag(value);
+  }
+
+  /**
+   * Write a MessageSet extension field to the stream.  For historical reasons,
+   * the wire format differs from normal fields.
+   */
+//  public void writeMessageSetExtension(final int fieldNumber,
+//                                       final MessageMicro value)
+//                                       throws IOException {
+//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_START_GROUP);
+//    writeUInt32(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber);
+//    writeMessage(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
+//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_END_GROUP);
+//  }
+
+  /**
+   * Write an unparsed MessageSet extension field to the stream.  For
+   * historical reasons, the wire format differs from normal fields.
+   */
+//  public void writeRawMessageSetExtension(final int fieldNumber,
+//                                          final ByteStringMicro value)
+//                                          throws IOException {
+//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_START_GROUP);
+//    writeUInt32(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber);
+//    writeBytes(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
+//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_END_GROUP);
+//  }
+
+  // -----------------------------------------------------------------
+
+  /** Write a {@code double} field to the stream. */
+  public void writeDoubleNoTag(final double value) throws IOException {
+    writeRawLittleEndian64(Double.doubleToLongBits(value));
+  }
+
+  /** Write a {@code float} field to the stream. */
+  public void writeFloatNoTag(final float value) throws IOException {
+    writeRawLittleEndian32(Float.floatToIntBits(value));
+  }
+
+  /** Write a {@code uint64} field to the stream. */
+  public void writeUInt64NoTag(final long value) throws IOException {
+    writeRawVarint64(value);
+  }
+
+  /** Write an {@code int64} field to the stream. */
+  public void writeInt64NoTag(final long value) throws IOException {
+    writeRawVarint64(value);
+  }
+
+  /** Write an {@code int32} field to the stream. */
+  public void writeInt32NoTag(final int value) throws IOException {
+    if (value >= 0) {
+      writeRawVarint32(value);
+    } else {
+      // Must sign-extend.
+      writeRawVarint64(value);
+    }
+  }
+
+  /** Write a {@code fixed64} field to the stream. */
+  public void writeFixed64NoTag(final long value) throws IOException {
+    writeRawLittleEndian64(value);
+  }
+
+  /** Write a {@code fixed32} field to the stream. */
+  public void writeFixed32NoTag(final int value) throws IOException {
+    writeRawLittleEndian32(value);
+  }
+
+  /** Write a {@code bool} field to the stream. */
+  public void writeBoolNoTag(final boolean value) throws IOException {
+    writeRawByte(value ? 1 : 0);
+  }
+
+  /** Write a {@code string} field to the stream. */
+  public void writeStringNoTag(final String value) throws IOException {
+    // Unfortunately there does not appear to be any way to tell Java to encode
+    // UTF-8 directly into our buffer, so we have to let it create its own byte
+    // array and then copy.
+    final byte[] bytes = value.getBytes("UTF-8");
+    writeRawVarint32(bytes.length);
+    writeRawBytes(bytes);
+  }
+
+  /** Write a {@code group} field to the stream. */
+  public void writeGroupNoTag(final MessageNano value) throws IOException {
+    value.writeTo(this);
+  }
+
+  /** Write an embedded message field to the stream. */
+  public void writeMessageNoTag(final MessageNano value) throws IOException {
+    writeRawVarint32(value.getCachedSize());
+    value.writeTo(this);
+  }
+
+  /** Write a {@code bytes} field to the stream. */
+  public void writeBytesNoTag(final byte[] value) throws IOException {
+    writeRawVarint32(value.length);
+    writeRawBytes(value);
+  }
+
+  /** Write a {@code uint32} field to the stream. */
+  public void writeUInt32NoTag(final int value) throws IOException {
+    writeRawVarint32(value);
+  }
+
+  /**
+   * Write an enum field to the stream.  Caller is responsible
+   * for converting the enum value to its numeric value.
+   */
+  public void writeEnumNoTag(final int value) throws IOException {
+    writeRawVarint32(value);
+  }
+
+  /** Write an {@code sfixed32} field to the stream. */
+  public void writeSFixed32NoTag(final int value) throws IOException {
+    writeRawLittleEndian32(value);
+  }
+
+  /** Write an {@code sfixed64} field to the stream. */
+  public void writeSFixed64NoTag(final long value) throws IOException {
+    writeRawLittleEndian64(value);
+  }
+
+  /** Write an {@code sint32} field to the stream. */
+  public void writeSInt32NoTag(final int value) throws IOException {
+    writeRawVarint32(encodeZigZag32(value));
+  }
+
+  /** Write an {@code sint64} field to the stream. */
+  public void writeSInt64NoTag(final long value) throws IOException {
+    writeRawVarint64(encodeZigZag64(value));
+  }
+
+  // =================================================================
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code double} field, including tag.
+   */
+  public static int computeDoubleSize(final int fieldNumber,
+                                      final double value) {
+    return computeTagSize(fieldNumber) + computeDoubleSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code float} field, including tag.
+   */
+  public static int computeFloatSize(final int fieldNumber, final float value) {
+    return computeTagSize(fieldNumber) + computeFloatSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code uint64} field, including tag.
+   */
+  public static int computeUInt64Size(final int fieldNumber, final long value) {
+    return computeTagSize(fieldNumber) + computeUInt64SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code int64} field, including tag.
+   */
+  public static int computeInt64Size(final int fieldNumber, final long value) {
+    return computeTagSize(fieldNumber) + computeInt64SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code int32} field, including tag.
+   */
+  public static int computeInt32Size(final int fieldNumber, final int value) {
+    return computeTagSize(fieldNumber) + computeInt32SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code fixed64} field, including tag.
+   */
+  public static int computeFixed64Size(final int fieldNumber,
+                                       final long value) {
+    return computeTagSize(fieldNumber) + computeFixed64SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code fixed32} field, including tag.
+   */
+  public static int computeFixed32Size(final int fieldNumber,
+                                       final int value) {
+    return computeTagSize(fieldNumber) + computeFixed32SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code bool} field, including tag.
+   */
+  public static int computeBoolSize(final int fieldNumber,
+                                    final boolean value) {
+    return computeTagSize(fieldNumber) + computeBoolSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code string} field, including tag.
+   */
+  public static int computeStringSize(final int fieldNumber,
+                                      final String value) {
+    return computeTagSize(fieldNumber) + computeStringSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code group} field, including tag.
+   */
+  public static int computeGroupSize(final int fieldNumber,
+                                     final MessageNano value) {
+    return computeTagSize(fieldNumber) * 2 + computeGroupSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * embedded message field, including tag.
+   */
+  public static int computeMessageSize(final int fieldNumber,
+                                       final MessageNano value) {
+    return computeTagSize(fieldNumber) + computeMessageSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code bytes} field, including tag.
+   */
+  public static int computeBytesSize(final int fieldNumber,
+                                     final byte[] value) {
+    return computeTagSize(fieldNumber) + computeBytesSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code uint32} field, including tag.
+   */
+  public static int computeUInt32Size(final int fieldNumber, final int value) {
+    return computeTagSize(fieldNumber) + computeUInt32SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * enum field, including tag.  Caller is responsible for converting the
+   * enum value to its numeric value.
+   */
+  public static int computeEnumSize(final int fieldNumber, final int value) {
+    return computeTagSize(fieldNumber) + computeEnumSizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sfixed32} field, including tag.
+   */
+  public static int computeSFixed32Size(final int fieldNumber,
+                                        final int value) {
+    return computeTagSize(fieldNumber) + computeSFixed32SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sfixed64} field, including tag.
+   */
+  public static int computeSFixed64Size(final int fieldNumber,
+                                        final long value) {
+    return computeTagSize(fieldNumber) + computeSFixed64SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sint32} field, including tag.
+   */
+  public static int computeSInt32Size(final int fieldNumber, final int value) {
+    return computeTagSize(fieldNumber) + computeSInt32SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sint64} field, including tag.
+   */
+  public static int computeSInt64Size(final int fieldNumber, final long value) {
+    return computeTagSize(fieldNumber) + computeSInt64SizeNoTag(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * MessageSet extension to the stream.  For historical reasons,
+   * the wire format differs from normal fields.
+   */
+//  public static int computeMessageSetExtensionSize(
+//      final int fieldNumber, final MessageMicro value) {
+//    return computeTagSize(WireFormatMicro.MESSAGE_SET_ITEM) * 2 +
+//           computeUInt32Size(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber) +
+//           computeMessageSize(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
+//  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * unparsed MessageSet extension field to the stream.  For
+   * historical reasons, the wire format differs from normal fields.
+   */
+//  public static int computeRawMessageSetExtensionSize(
+//      final int fieldNumber, final ByteStringMicro value) {
+//    return computeTagSize(WireFormatMicro.MESSAGE_SET_ITEM) * 2 +
+//           computeUInt32Size(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber) +
+//           computeBytesSize(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
+//  }
+
+  // -----------------------------------------------------------------
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code double} field, including tag.
+   */
+  public static int computeDoubleSizeNoTag(final double value) {
+    return LITTLE_ENDIAN_64_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code float} field, including tag.
+   */
+  public static int computeFloatSizeNoTag(final float value) {
+    return LITTLE_ENDIAN_32_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code uint64} field, including tag.
+   */
+  public static int computeUInt64SizeNoTag(final long value) {
+    return computeRawVarint64Size(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code int64} field, including tag.
+   */
+  public static int computeInt64SizeNoTag(final long value) {
+    return computeRawVarint64Size(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code int32} field, including tag.
+   */
+  public static int computeInt32SizeNoTag(final int value) {
+    if (value >= 0) {
+      return computeRawVarint32Size(value);
+    } else {
+      // Must sign-extend.
+      return 10;
+    }
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code fixed64} field.
+   */
+  public static int computeFixed64SizeNoTag(final long value) {
+    return LITTLE_ENDIAN_64_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code fixed32} field.
+   */
+  public static int computeFixed32SizeNoTag(final int value) {
+    return LITTLE_ENDIAN_32_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code bool} field.
+   */
+  public static int computeBoolSizeNoTag(final boolean value) {
+    return 1;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code string} field.
+   */
+  public static int computeStringSizeNoTag(final String value) {
+    try {
+      final byte[] bytes = value.getBytes("UTF-8");
+      return computeRawVarint32Size(bytes.length) +
+             bytes.length;
+    } catch (UnsupportedEncodingException e) {
+      throw new RuntimeException("UTF-8 not supported.");
+    }
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code group} field.
+   */
+  public static int computeGroupSizeNoTag(final MessageNano value) {
+    return value.getSerializedSize();
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an embedded
+   * message field.
+   */
+  public static int computeMessageSizeNoTag(final MessageNano value) {
+    final int size = value.getSerializedSize();
+    return computeRawVarint32Size(size) + size;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code bytes} field.
+   */
+  public static int computeBytesSizeNoTag(final byte[] value) {
+    return computeRawVarint32Size(value.length) + value.length;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a
+   * {@code uint32} field.
+   */
+  public static int computeUInt32SizeNoTag(final int value) {
+    return computeRawVarint32Size(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an enum field.
+   * Caller is responsible for converting the enum value to its numeric value.
+   */
+  public static int computeEnumSizeNoTag(final int value) {
+    return computeRawVarint32Size(value);
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sfixed32} field.
+   */
+  public static int computeSFixed32SizeNoTag(final int value) {
+    return LITTLE_ENDIAN_32_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sfixed64} field.
+   */
+  public static int computeSFixed64SizeNoTag(final long value) {
+    return LITTLE_ENDIAN_64_SIZE;
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sint32} field.
+   */
+  public static int computeSInt32SizeNoTag(final int value) {
+    return computeRawVarint32Size(encodeZigZag32(value));
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode an
+   * {@code sint64} field.
+   */
+  public static int computeSInt64SizeNoTag(final long value) {
+    return computeRawVarint64Size(encodeZigZag64(value));
+  }
+
+  // =================================================================
+
+  /**
+   * If writing to a flat array, return the space left in the array.
+   * Otherwise, throws {@code UnsupportedOperationException}.
+   */
+  public int spaceLeft() {
+    return limit - position;
+  }
+
+  /**
+   * Verifies that {@link #spaceLeft()} returns zero.  It's common to create
+   * a byte array that is exactly big enough to hold a message, then write to
+   * it with a {@code CodedOutputStream}.  Calling {@code checkNoSpaceLeft()}
+   * after writing verifies that the message was actually as big as expected,
+   * which can help catch bugs.
+   */
+  public void checkNoSpaceLeft() {
+    if (spaceLeft() != 0) {
+      throw new IllegalStateException(
+        "Did not write as much data as expected.");
+    }
+  }
+
+  /**
+   * If you create a CodedOutputStream around a simple flat array, you must
+   * not attempt to write more bytes than the array has space.  Otherwise,
+   * this exception will be thrown.
+   */
+  public static class OutOfSpaceException extends IOException {
+    private static final long serialVersionUID = -6947486886997889499L;
+
+    OutOfSpaceException(int position, int limit) {
+      super("CodedOutputStream was writing to a flat byte array and ran " +
+            "out of space (pos " + position + " limit " + limit + ").");
+    }
+  }
+
+  /** Write a single byte. */
+  public void writeRawByte(final byte value) throws IOException {
+    if (position == limit) {
+      // We're writing to a single buffer.
+      throw new OutOfSpaceException(position, limit);
+    }
+
+    buffer[position++] = value;
+  }
+
+  /** Write a single byte, represented by an integer value. */
+  public void writeRawByte(final int value) throws IOException {
+    writeRawByte((byte) value);
+  }
+
+  /** Write an array of bytes. */
+  public void writeRawBytes(final byte[] value) throws IOException {
+    writeRawBytes(value, 0, value.length);
+  }
+
+  /** Write part of an array of bytes. */
+  public void writeRawBytes(final byte[] value, int offset, int length)
+                            throws IOException {
+    if (limit - position >= length) {
+      // We have room in the current buffer.
+      System.arraycopy(value, offset, buffer, position, length);
+      position += length;
+    } else {
+      // We're writing to a single buffer.
+      throw new OutOfSpaceException(position, limit);
+    }
+  }
+
+  /** Encode and write a tag. */
+  public void writeTag(final int fieldNumber, final int wireType)
+                       throws IOException {
+    writeRawVarint32(WireFormatNano.makeTag(fieldNumber, wireType));
+  }
+
+  /** Compute the number of bytes that would be needed to encode a tag. */
+  public static int computeTagSize(final int fieldNumber) {
+    return computeRawVarint32Size(WireFormatNano.makeTag(fieldNumber, 0));
+  }
+
+  /**
+   * Encode and write a varint.  {@code value} is treated as
+   * unsigned, so it won't be sign-extended if negative.
+   */
+  public void writeRawVarint32(int value) throws IOException {
+    while (true) {
+      if ((value & ~0x7F) == 0) {
+        writeRawByte(value);
+        return;
+      } else {
+        writeRawByte((value & 0x7F) | 0x80);
+        value >>>= 7;
+      }
+    }
+  }
+
+  /**
+   * Compute the number of bytes that would be needed to encode a varint.
+   * {@code value} is treated as unsigned, so it won't be sign-extended if
+   * negative.
+   */
+  public static int computeRawVarint32Size(final int value) {
+    if ((value & (0xffffffff <<  7)) == 0) return 1;
+    if ((value & (0xffffffff << 14)) == 0) return 2;
+    if ((value & (0xffffffff << 21)) == 0) return 3;
+    if ((value & (0xffffffff << 28)) == 0) return 4;
+    return 5;
+  }
+
+  /** Encode and write a varint. */
+  public void writeRawVarint64(long value) throws IOException {
+    while (true) {
+      if ((value & ~0x7FL) == 0) {
+        writeRawByte((int)value);
+        return;
+      } else {
+        writeRawByte(((int)value & 0x7F) | 0x80);
+        value >>>= 7;
+      }
+    }
+  }
+
+  /** Compute the number of bytes that would be needed to encode a varint. */
+  public static int computeRawVarint64Size(final long value) {
+    if ((value & (0xffffffffffffffffL <<  7)) == 0) return 1;
+    if ((value & (0xffffffffffffffffL << 14)) == 0) return 2;
+    if ((value & (0xffffffffffffffffL << 21)) == 0) return 3;
+    if ((value & (0xffffffffffffffffL << 28)) == 0) return 4;
+    if ((value & (0xffffffffffffffffL << 35)) == 0) return 5;
+    if ((value & (0xffffffffffffffffL << 42)) == 0) return 6;
+    if ((value & (0xffffffffffffffffL << 49)) == 0) return 7;
+    if ((value & (0xffffffffffffffffL << 56)) == 0) return 8;
+    if ((value & (0xffffffffffffffffL << 63)) == 0) return 9;
+    return 10;
+  }
+
+  /** Write a little-endian 32-bit integer. */
+  public void writeRawLittleEndian32(final int value) throws IOException {
+    writeRawByte((value      ) & 0xFF);
+    writeRawByte((value >>  8) & 0xFF);
+    writeRawByte((value >> 16) & 0xFF);
+    writeRawByte((value >> 24) & 0xFF);
+  }
+
+  public static final int LITTLE_ENDIAN_32_SIZE = 4;
+
+  /** Write a little-endian 64-bit integer. */
+  public void writeRawLittleEndian64(final long value) throws IOException {
+    writeRawByte((int)(value      ) & 0xFF);
+    writeRawByte((int)(value >>  8) & 0xFF);
+    writeRawByte((int)(value >> 16) & 0xFF);
+    writeRawByte((int)(value >> 24) & 0xFF);
+    writeRawByte((int)(value >> 32) & 0xFF);
+    writeRawByte((int)(value >> 40) & 0xFF);
+    writeRawByte((int)(value >> 48) & 0xFF);
+    writeRawByte((int)(value >> 56) & 0xFF);
+  }
+
+  public static final int LITTLE_ENDIAN_64_SIZE = 8;
+
+  /**
+   * Encode a ZigZag-encoded 32-bit value.  ZigZag encodes signed integers
+   * into values that can be efficiently encoded with varint.  (Otherwise,
+   * negative values must be sign-extended to 64 bits to be varint encoded,
+   * thus always taking 10 bytes on the wire.)
+   *
+   * @param n A signed 32-bit integer.
+   * @return An unsigned 32-bit integer, stored in a signed int because
+   *         Java has no explicit unsigned support.
+   */
+  public static int encodeZigZag32(final int n) {
+    // Note:  the right-shift must be arithmetic
+    return (n << 1) ^ (n >> 31);
+  }
+
+  /**
+   * Encode a ZigZag-encoded 64-bit value.  ZigZag encodes signed integers
+   * into values that can be efficiently encoded with varint.  (Otherwise,
+   * negative values must be sign-extended to 64 bits to be varint encoded,
+   * thus always taking 10 bytes on the wire.)
+   *
+   * @param n A signed 64-bit integer.
+   * @return An unsigned 64-bit integer, stored in a signed int because
+   *         Java has no explicit unsigned support.
+   */
+  public static long encodeZigZag64(final long n) {
+    // Note:  the right-shift must be arithmetic
+    return (n << 1) ^ (n >> 63);
+  }
+}

javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java

@@ -0,0 +1,187 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+
+/**
+ * Base class of those Protocol Buffer messages that need to store unknown fields,
+ * such as extensions.
+ */
+public abstract class ExtendableMessageNano<M extends ExtendableMessageNano<M>>
+        extends MessageNano {
+    /**
+     * A container for fields unknown to the message, including extensions. Extension fields can
+     * can be accessed through the {@link #getExtension} and {@link #setExtension} methods.
+     */
+    protected FieldArray unknownFieldData;
+
+    @Override
+    protected int computeSerializedSize() {
+        int size = 0;
+        if (unknownFieldData != null) {
+            for (int i = 0; i < unknownFieldData.size(); i++) {
+                FieldData field = unknownFieldData.dataAt(i);
+                size += field.computeSerializedSize();
+            }
+        }
+        return size;
+    }
+
+    @Override
+    public void writeTo(CodedOutputByteBufferNano output) throws IOException {
+        if (unknownFieldData == null) {
+            return;
+        }
+        for (int i = 0; i < unknownFieldData.size(); i++) {
+            FieldData field = unknownFieldData.dataAt(i);
+            field.writeTo(output);
+        }
+    }
+
+    /**
+     * Checks if there is a value stored for the specified extension in this
+     * message.
+     */
+    public final boolean hasExtension(Extension<M, ?> extension) {
+        if (unknownFieldData == null) {
+            return false;
+        }
+        FieldData field = unknownFieldData.get(WireFormatNano.getTagFieldNumber(extension.tag));
+        return field != null;
+    }
+
+    /**
+     * Gets the value stored in the specified extension of this message.
+     */
+    public final <T> T getExtension(Extension<M, T> extension) {
+        if (unknownFieldData == null) {
+            return null;
+        }
+        FieldData field = unknownFieldData.get(WireFormatNano.getTagFieldNumber(extension.tag));
+        return field == null ? null : field.getValue(extension);
+    }
+
+    /**
+     * Sets the value of the specified extension of this message.
+     */
+    public final <T> M setExtension(Extension<M, T> extension, T value) {
+        int fieldNumber = WireFormatNano.getTagFieldNumber(extension.tag);
+        if (value == null) {
+            if (unknownFieldData != null) {
+                unknownFieldData.remove(fieldNumber);
+                if (unknownFieldData.isEmpty()) {
+                    unknownFieldData = null;
+                }
+            }
+        } else {
+            FieldData field = null;
+            if (unknownFieldData == null) {
+                unknownFieldData = new FieldArray();
+            } else {
+                field = unknownFieldData.get(fieldNumber);
+            }
+            if (field == null) {
+                unknownFieldData.put(fieldNumber, new FieldData(extension, value));
+            } else {
+                field.setValue(extension, value);
+            }
+        }
+
+        @SuppressWarnings("unchecked") // Generated code should guarantee type safety
+        M typedThis = (M) this;
+        return typedThis;
+    }
+
+    /**
+     * Stores the binary data of an unknown field.
+     *
+     * <p>Generated messages will call this for unknown fields if the store_unknown_fields
+     * option is on.
+     *
+     * <p>Note that the tag might be a end-group tag (rather than the start of an unknown field) in
+     * which case we do not want to add an unknown field entry.
+     *
+     * @param input the input buffer.
+     * @param tag the tag of the field.
+
+     * @return {@literal true} unless the tag is an end-group tag.
+     */
+    protected final boolean storeUnknownField(CodedInputByteBufferNano input, int tag)
+            throws IOException {
+        int startPos = input.getPosition();
+        if (!input.skipField(tag)) {
+            return false;  // This wasn't an unknown field, it's an end-group tag.
+        }
+        int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
+        int endPos = input.getPosition();
+        byte[] bytes = input.getData(startPos, endPos - startPos);
+        UnknownFieldData unknownField = new UnknownFieldData(tag, bytes);
+
+        FieldData field = null;
+        if (unknownFieldData == null) {
+            unknownFieldData = new FieldArray();
+        } else {
+            field = unknownFieldData.get(fieldNumber);
+        }
+        if (field == null) {
+            field = new FieldData();
+            unknownFieldData.put(fieldNumber, field);
+        }
+        field.addUnknownField(unknownField);
+        return true;
+    }
+
+    /**
+     * Returns whether the stored unknown field data in this message is equivalent to that in the
+     * other message.
+     *
+     * @param other the other message.
+     * @return whether the two sets of unknown field data are equal.
+     */
+    protected final boolean unknownFieldDataEquals(M other) {
+        if (unknownFieldData == null || unknownFieldData.isEmpty()) {
+            return other.unknownFieldData == null || other.unknownFieldData.isEmpty();
+        } else {
+            return unknownFieldData.equals(other.unknownFieldData);
+        }
+    }
+
+    /**
+     * Computes the hashcode representing the unknown field data stored in this message.
+     *
+     * @return the hashcode for the unknown field data.
+     */
+    protected final int unknownFieldDataHashCode() {
+        return (unknownFieldData == null || unknownFieldData.isEmpty()
+                ? 0 : unknownFieldData.hashCode());
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/Extension.java

@@ -0,0 +1,722 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Represents an extension.
+ *
+ * @author bduff@google.com (Brian Duff)
+ * @author maxtroy@google.com (Max Cai)
+ * @param <M> the type of the extendable message this extension is for.
+ * @param <T> the Java type of the extension; see {@link #clazz}.
+ */
+public class Extension<M extends ExtendableMessageNano<M>, T> {
+
+    /*
+     * Because we typically only define message-typed extensions, the Extension class hierarchy is
+     * designed as follows, to allow a big amount of code in this file to be removed by ProGuard:
+     *
+     *            Extension          // ready to use for message/group typed extensions
+     *                Δ
+     *                |
+     *       PrimitiveExtension      // for primitive/enum typed extensions
+     */
+
+    public static final int TYPE_DOUBLE   = 1;
+    public static final int TYPE_FLOAT    = 2;
+    public static final int TYPE_INT64    = 3;
+    public static final int TYPE_UINT64   = 4;
+    public static final int TYPE_INT32    = 5;
+    public static final int TYPE_FIXED64  = 6;
+    public static final int TYPE_FIXED32  = 7;
+    public static final int TYPE_BOOL     = 8;
+    public static final int TYPE_STRING   = 9;
+    public static final int TYPE_GROUP    = 10;
+    public static final int TYPE_MESSAGE  = 11;
+    public static final int TYPE_BYTES    = 12;
+    public static final int TYPE_UINT32   = 13;
+    public static final int TYPE_ENUM     = 14;
+    public static final int TYPE_SFIXED32 = 15;
+    public static final int TYPE_SFIXED64 = 16;
+    public static final int TYPE_SINT32   = 17;
+    public static final int TYPE_SINT64   = 18;
+
+    /**
+     * Creates an {@code Extension} of the given message type and tag number.
+     * Should be used by the generated code only.
+     *
+     * @param type {@link #TYPE_MESSAGE} or {@link #TYPE_GROUP}
+     */
+    public static <M extends ExtendableMessageNano<M>, T extends MessageNano>
+            Extension<M, T> createMessageTyped(int type, Class<T> clazz, int tag) {
+        return new Extension<M, T>(type, clazz, tag, false);
+    }
+
+    /**
+     * Creates a repeated {@code Extension} of the given message type and tag number.
+     * Should be used by the generated code only.
+     *
+     * @param type {@link #TYPE_MESSAGE} or {@link #TYPE_GROUP}
+     */
+    public static <M extends ExtendableMessageNano<M>, T extends MessageNano>
+            Extension<M, T[]> createRepeatedMessageTyped(int type, Class<T[]> clazz, int tag) {
+        return new Extension<M, T[]>(type, clazz, tag, true);
+    }
+
+    /**
+     * Creates an {@code Extension} of the given primitive type and tag number.
+     * Should be used by the generated code only.
+     *
+     * @param type one of {@code TYPE_*}, except {@link #TYPE_MESSAGE} and {@link #TYPE_GROUP}
+     * @param clazz the boxed Java type of this extension
+     */
+    public static <M extends ExtendableMessageNano<M>, T>
+            Extension<M, T> createPrimitiveTyped(int type, Class<T> clazz, int tag) {
+        return new PrimitiveExtension<M, T>(type, clazz, tag, false, 0, 0);
+    }
+
+    /**
+     * Creates a repeated {@code Extension} of the given primitive type and tag number.
+     * Should be used by the generated code only.
+     *
+     * @param type one of {@code TYPE_*}, except {@link #TYPE_MESSAGE} and {@link #TYPE_GROUP}
+     * @param clazz the Java array type of this extension, with an unboxed component type
+     */
+    public static <M extends ExtendableMessageNano<M>, T>
+            Extension<M, T> createRepeatedPrimitiveTyped(
+                    int type, Class<T> clazz, int tag, int nonPackedTag, int packedTag) {
+        return new PrimitiveExtension<M, T>(type, clazz, tag, true, nonPackedTag, packedTag);
+    }
+
+    /**
+     * Protocol Buffer type of this extension; one of the {@code TYPE_} constants.
+     */
+    protected final int type;
+
+    /**
+     * Java type of this extension. For a singular extension, this is the boxed Java type for the
+     * Protocol Buffer {@link #type}; for a repeated extension, this is an array type whose
+     * component type is the unboxed Java type for {@link #type}. For example, for a singular
+     * {@code int32}/{@link #TYPE_INT32} extension, this equals {@code Integer.class}; for a
+     * repeated {@code int32} extension, this equals {@code int[].class}.
+     */
+    protected final Class<T> clazz;
+
+    /**
+     * Tag number of this extension.
+     */
+    public final int tag;
+
+    /**
+     * Whether this extension is repeated.
+     */
+    protected final boolean repeated;
+
+    private Extension(int type, Class<T> clazz, int tag, boolean repeated) {
+        this.type = type;
+        this.clazz = clazz;
+        this.tag = tag;
+        this.repeated = repeated;
+    }
+
+    /**
+     * Returns the value of this extension stored in the given list of unknown fields, or
+     * {@code null} if no unknown fields matches this extension.
+     *
+     * @param unknownFields a list of {@link UnknownFieldData}. All of the elements must have a tag
+     *                      that matches this Extension's tag.
+     *
+     */
+    final T getValueFrom(List<UnknownFieldData> unknownFields) {
+        if (unknownFields == null) {
+            return null;
+        }
+        return repeated ? getRepeatedValueFrom(unknownFields) : getSingularValueFrom(unknownFields);
+    }
+
+    private T getRepeatedValueFrom(List<UnknownFieldData> unknownFields) {
+        // For repeated extensions, read all matching unknown fields in their original order.
+        List<Object> resultList = new ArrayList<Object>();
+        for (int i = 0; i < unknownFields.size(); i++) {
+            UnknownFieldData data = unknownFields.get(i);
+            if (data.bytes.length != 0) {
+                readDataInto(data, resultList);
+            }
+        }
+
+        int resultSize = resultList.size();
+        if (resultSize == 0) {
+            return null;
+        } else {
+            T result = clazz.cast(Array.newInstance(clazz.getComponentType(), resultSize));
+            for (int i = 0; i < resultSize; i++) {
+                Array.set(result, i, resultList.get(i));
+            }
+            return result;
+        }
+    }
+
+    private T getSingularValueFrom(List<UnknownFieldData> unknownFields) {
+        // For singular extensions, get the last piece of data stored under this extension.
+        if (unknownFields.isEmpty()) {
+            return null;
+        }
+        UnknownFieldData lastData = unknownFields.get(unknownFields.size() - 1);
+        return clazz.cast(readData(CodedInputByteBufferNano.newInstance(lastData.bytes)));
+    }
+
+    protected Object readData(CodedInputByteBufferNano input) {
+        // This implementation is for message/group extensions.
+        Class<?> messageType = repeated ? clazz.getComponentType() : clazz;
+        try {
+            switch (type) {
+                case TYPE_GROUP:
+                    MessageNano group = (MessageNano) messageType.newInstance();
+                    input.readGroup(group, WireFormatNano.getTagFieldNumber(tag));
+                    return group;
+                case TYPE_MESSAGE:
+                    MessageNano message = (MessageNano) messageType.newInstance();
+                    input.readMessage(message);
+                    return message;
+                default:
+                    throw new IllegalArgumentException("Unknown type " + type);
+            }
+        } catch (InstantiationException e) {
+            throw new IllegalArgumentException(
+                    "Error creating instance of class " + messageType, e);
+        } catch (IllegalAccessException e) {
+            throw new IllegalArgumentException(
+                    "Error creating instance of class " + messageType, e);
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Error reading extension field", e);
+        }
+    }
+
+    protected void readDataInto(UnknownFieldData data, List<Object> resultList) {
+        // This implementation is for message/group extensions.
+        resultList.add(readData(CodedInputByteBufferNano.newInstance(data.bytes)));
+    }
+
+    void writeTo(Object value, CodedOutputByteBufferNano output) throws IOException {
+        if (repeated) {
+            writeRepeatedData(value, output);
+        } else {
+            writeSingularData(value, output);
+        }
+    }
+
+    protected void writeSingularData(Object value, CodedOutputByteBufferNano out) {
+        // This implementation is for message/group extensions.
+        try {
+            out.writeRawVarint32(tag);
+            switch (type) {
+                case TYPE_GROUP:
+                    MessageNano groupValue = (MessageNano) value;
+                    int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
+                    out.writeGroupNoTag(groupValue);
+                    // The endgroup tag must be included in the data payload.
+                    out.writeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP);
+                    break;
+                case TYPE_MESSAGE:
+                    MessageNano messageValue = (MessageNano) value;
+                    out.writeMessageNoTag(messageValue);
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unknown type " + type);
+            }
+        } catch (IOException e) {
+            // Should not happen
+            throw new IllegalStateException(e);
+        }
+    }
+
+    protected void writeRepeatedData(Object array, CodedOutputByteBufferNano output) {
+        // This implementation is for non-packed extensions.
+        int arrayLength = Array.getLength(array);
+        for (int i = 0; i < arrayLength; i++) {
+            Object element = Array.get(array, i);
+            if (element != null) {
+                writeSingularData(element, output);
+            }
+        }
+    }
+
+    int computeSerializedSize(Object value) {
+        if (repeated) {
+            return computeRepeatedSerializedSize(value);
+        } else {
+            return computeSingularSerializedSize(value);
+        }
+    }
+
+    protected int computeRepeatedSerializedSize(Object array) {
+        // This implementation is for non-packed extensions.
+        int size = 0;
+        int arrayLength = Array.getLength(array);
+        for (int i = 0; i < arrayLength; i++) {
+            Object element = Array.get(array, i);
+            if (element != null) {
+                size += computeSingularSerializedSize(Array.get(array, i));
+            }
+        }
+        return size;
+    }
+
+    protected int computeSingularSerializedSize(Object value) {
+        // This implementation is for message/group extensions.
+        int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
+        switch (type) {
+            case TYPE_GROUP:
+                MessageNano groupValue = (MessageNano) value;
+                return CodedOutputByteBufferNano.computeGroupSize(fieldNumber, groupValue);
+            case TYPE_MESSAGE:
+                MessageNano messageValue = (MessageNano) value;
+                return CodedOutputByteBufferNano.computeMessageSize(fieldNumber, messageValue);
+            default:
+                throw new IllegalArgumentException("Unknown type " + type);
+        }
+    }
+
+    /**
+     * Represents an extension of a primitive (including enum) type. If there is no primitive
+     * extensions, this subclass will be removable by ProGuard.
+     */
+    private static class PrimitiveExtension<M extends ExtendableMessageNano<M>, T>
+            extends Extension<M, T> {
+
+        /**
+         * Tag of a piece of non-packed data from the wire compatible with this extension.
+         */
+        private final int nonPackedTag;
+
+        /**
+         * Tag of a piece of packed data from the wire compatible with this extension.
+         * 0 if the type of this extension is not packable.
+         */
+        private final int packedTag;
+
+        public PrimitiveExtension(int type, Class<T> clazz, int tag, boolean repeated,
+                int nonPackedTag, int packedTag) {
+            super(type, clazz, tag, repeated);
+            this.nonPackedTag = nonPackedTag;
+            this.packedTag = packedTag;
+        }
+
+        @Override
+        protected Object readData(CodedInputByteBufferNano input) {
+            try {
+                switch (type) {
+                    case TYPE_DOUBLE:
+                        return input.readDouble();
+                    case TYPE_FLOAT:
+                        return input.readFloat();
+                    case TYPE_INT64:
+                        return input.readInt64();
+                    case TYPE_UINT64:
+                        return input.readUInt64();
+                    case TYPE_INT32:
+                        return input.readInt32();
+                    case TYPE_FIXED64:
+                        return input.readFixed64();
+                    case TYPE_FIXED32:
+                        return input.readFixed32();
+                    case TYPE_BOOL:
+                        return input.readBool();
+                    case TYPE_STRING:
+                        return input.readString();
+                    case TYPE_BYTES:
+                        return input.readBytes();
+                    case TYPE_UINT32:
+                        return input.readUInt32();
+                    case TYPE_ENUM:
+                        return input.readEnum();
+                    case TYPE_SFIXED32:
+                        return input.readSFixed32();
+                    case TYPE_SFIXED64:
+                        return input.readSFixed64();
+                    case TYPE_SINT32:
+                        return input.readSInt32();
+                    case TYPE_SINT64:
+                        return input.readSInt64();
+                    default:
+                        throw new IllegalArgumentException("Unknown type " + type);
+                }
+            } catch (IOException e) {
+                throw new IllegalArgumentException("Error reading extension field", e);
+            }
+        }
+
+        @Override
+        protected void readDataInto(UnknownFieldData data, List<Object> resultList) {
+            // This implementation is for primitive typed extensions,
+            // which can read both packed and non-packed data.
+            if (data.tag == nonPackedTag) {
+                resultList.add(readData(CodedInputByteBufferNano.newInstance(data.bytes)));
+            } else {
+                CodedInputByteBufferNano buffer =
+                        CodedInputByteBufferNano.newInstance(data.bytes);
+                try {
+                    buffer.pushLimit(buffer.readRawVarint32()); // length limit
+                } catch (IOException e) {
+                    throw new IllegalArgumentException("Error reading extension field", e);
+                }
+                while (!buffer.isAtEnd()) {
+                    resultList.add(readData(buffer));
+                }
+            }
+        }
+
+        @Override
+        protected final void writeSingularData(Object value, CodedOutputByteBufferNano output) {
+            try {
+                output.writeRawVarint32(tag);
+                switch (type) {
+                    case TYPE_DOUBLE:
+                        Double doubleValue = (Double) value;
+                        output.writeDoubleNoTag(doubleValue);
+                        break;
+                    case TYPE_FLOAT:
+                        Float floatValue = (Float) value;
+                        output.writeFloatNoTag(floatValue);
+                        break;
+                    case TYPE_INT64:
+                        Long int64Value = (Long) value;
+                        output.writeInt64NoTag(int64Value);
+                        break;
+                    case TYPE_UINT64:
+                        Long uint64Value = (Long) value;
+                        output.writeUInt64NoTag(uint64Value);
+                        break;
+                    case TYPE_INT32:
+                        Integer int32Value = (Integer) value;
+                        output.writeInt32NoTag(int32Value);
+                        break;
+                    case TYPE_FIXED64:
+                        Long fixed64Value = (Long) value;
+                        output.writeFixed64NoTag(fixed64Value);
+                        break;
+                    case TYPE_FIXED32:
+                        Integer fixed32Value = (Integer) value;
+                        output.writeFixed32NoTag(fixed32Value);
+                        break;
+                    case TYPE_BOOL:
+                        Boolean boolValue = (Boolean) value;
+                        output.writeBoolNoTag(boolValue);
+                        break;
+                    case TYPE_STRING:
+                        String stringValue = (String) value;
+                        output.writeStringNoTag(stringValue);
+                        break;
+                    case TYPE_BYTES:
+                        byte[] bytesValue = (byte[]) value;
+                        output.writeBytesNoTag(bytesValue);
+                        break;
+                    case TYPE_UINT32:
+                        Integer uint32Value = (Integer) value;
+                        output.writeUInt32NoTag(uint32Value);
+                        break;
+                    case TYPE_ENUM:
+                        Integer enumValue = (Integer) value;
+                        output.writeEnumNoTag(enumValue);
+                        break;
+                    case TYPE_SFIXED32:
+                        Integer sfixed32Value = (Integer) value;
+                        output.writeSFixed32NoTag(sfixed32Value);
+                        break;
+                    case TYPE_SFIXED64:
+                        Long sfixed64Value = (Long) value;
+                        output.writeSFixed64NoTag(sfixed64Value);
+                        break;
+                    case TYPE_SINT32:
+                        Integer sint32Value = (Integer) value;
+                        output.writeSInt32NoTag(sint32Value);
+                        break;
+                    case TYPE_SINT64:
+                        Long sint64Value = (Long) value;
+                        output.writeSInt64NoTag(sint64Value);
+                        break;
+                    default:
+                        throw new IllegalArgumentException("Unknown type " + type);
+                }
+            } catch (IOException e) {
+                // Should not happen
+                throw new IllegalStateException(e);
+            }
+        }
+
+        @Override
+        protected void writeRepeatedData(Object array, CodedOutputByteBufferNano output) {
+            if (tag == nonPackedTag) {
+                // Use base implementation for non-packed data
+                super.writeRepeatedData(array, output);
+            } else if (tag == packedTag) {
+                // Packed. Note that the array element type is guaranteed to be primitive, so there
+                // won't be any null elements, so no null check in this block.
+                int arrayLength = Array.getLength(array);
+                int dataSize = computePackedDataSize(array);
+
+                try {
+                    output.writeRawVarint32(tag);
+                    output.writeRawVarint32(dataSize);
+                    switch (type) {
+                        case TYPE_BOOL:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeBoolNoTag(Array.getBoolean(array, i));
+                            }
+                            break;
+                        case TYPE_FIXED32:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeFixed32NoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        case TYPE_SFIXED32:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeSFixed32NoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        case TYPE_FLOAT:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeFloatNoTag(Array.getFloat(array, i));
+                            }
+                            break;
+                        case TYPE_FIXED64:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeFixed64NoTag(Array.getLong(array, i));
+                            }
+                            break;
+                        case TYPE_SFIXED64:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeSFixed64NoTag(Array.getLong(array, i));
+                            }
+                            break;
+                        case TYPE_DOUBLE:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeDoubleNoTag(Array.getDouble(array, i));
+                            }
+                            break;
+                        case TYPE_INT32:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeInt32NoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        case TYPE_SINT32:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeSInt32NoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        case TYPE_UINT32:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeUInt32NoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        case TYPE_INT64:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeInt64NoTag(Array.getLong(array, i));
+                            }
+                            break;
+                        case TYPE_SINT64:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeSInt64NoTag(Array.getLong(array, i));
+                            }
+                            break;
+                        case TYPE_UINT64:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeUInt64NoTag(Array.getLong(array, i));
+                            }
+                            break;
+                        case TYPE_ENUM:
+                            for (int i = 0; i < arrayLength; i++) {
+                                output.writeEnumNoTag(Array.getInt(array, i));
+                            }
+                            break;
+                        default:
+                            throw new IllegalArgumentException("Unpackable type " + type);
+                    }
+                } catch (IOException e) {
+                    // Should not happen.
+                    throw new IllegalStateException(e);
+                }
+            } else {
+                throw new IllegalArgumentException("Unexpected repeated extension tag " + tag
+                        + ", unequal to both non-packed variant " + nonPackedTag
+                        + " and packed variant " + packedTag);
+            }
+        }
+
+        private int computePackedDataSize(Object array) {
+            int dataSize = 0;
+            int arrayLength = Array.getLength(array);
+            switch (type) {
+                case TYPE_BOOL:
+                    // Bools are stored as int32 but just as 0 or 1, so 1 byte each.
+                    dataSize = arrayLength;
+                    break;
+                case TYPE_FIXED32:
+                case TYPE_SFIXED32:
+                case TYPE_FLOAT:
+                    dataSize = arrayLength * CodedOutputByteBufferNano.LITTLE_ENDIAN_32_SIZE;
+                    break;
+                case TYPE_FIXED64:
+                case TYPE_SFIXED64:
+                case TYPE_DOUBLE:
+                    dataSize = arrayLength * CodedOutputByteBufferNano.LITTLE_ENDIAN_64_SIZE;
+                    break;
+                case TYPE_INT32:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeInt32SizeNoTag(
+                                Array.getInt(array, i));
+                    }
+                    break;
+                case TYPE_SINT32:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeSInt32SizeNoTag(
+                                Array.getInt(array, i));
+                    }
+                    break;
+                case TYPE_UINT32:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeUInt32SizeNoTag(
+                                Array.getInt(array, i));
+                    }
+                    break;
+                case TYPE_INT64:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeInt64SizeNoTag(
+                                Array.getLong(array, i));
+                    }
+                    break;
+                case TYPE_SINT64:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeSInt64SizeNoTag(
+                                Array.getLong(array, i));
+                    }
+                    break;
+                case TYPE_UINT64:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeUInt64SizeNoTag(
+                                Array.getLong(array, i));
+                    }
+                    break;
+                case TYPE_ENUM:
+                    for (int i = 0; i < arrayLength; i++) {
+                        dataSize += CodedOutputByteBufferNano.computeEnumSizeNoTag(
+                                Array.getInt(array, i));
+                    }
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected non-packable type " + type);
+            }
+            return dataSize;
+        }
+
+        @Override
+        protected int computeRepeatedSerializedSize(Object array) {
+            if (tag == nonPackedTag) {
+                // Use base implementation for non-packed data
+                return super.computeRepeatedSerializedSize(array);
+            } else if (tag == packedTag) {
+                // Packed.
+                int dataSize = computePackedDataSize(array);
+                int payloadSize =
+                        dataSize + CodedOutputByteBufferNano.computeRawVarint32Size(dataSize);
+                return payloadSize + CodedOutputByteBufferNano.computeRawVarint32Size(tag);
+            } else {
+                throw new IllegalArgumentException("Unexpected repeated extension tag " + tag
+                        + ", unequal to both non-packed variant " + nonPackedTag
+                        + " and packed variant " + packedTag);
+            }
+        }
+
+        @Override
+        protected final int computeSingularSerializedSize(Object value) {
+            int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
+            switch (type) {
+                case TYPE_DOUBLE:
+                    Double doubleValue = (Double) value;
+                    return CodedOutputByteBufferNano.computeDoubleSize(fieldNumber, doubleValue);
+                case TYPE_FLOAT:
+                    Float floatValue = (Float) value;
+                    return CodedOutputByteBufferNano.computeFloatSize(fieldNumber, floatValue);
+                case TYPE_INT64:
+                    Long int64Value = (Long) value;
+                    return CodedOutputByteBufferNano.computeInt64Size(fieldNumber, int64Value);
+                case TYPE_UINT64:
+                    Long uint64Value = (Long) value;
+                    return CodedOutputByteBufferNano.computeUInt64Size(fieldNumber, uint64Value);
+                case TYPE_INT32:
+                    Integer int32Value = (Integer) value;
+                    return CodedOutputByteBufferNano.computeInt32Size(fieldNumber, int32Value);
+                case TYPE_FIXED64:
+                    Long fixed64Value = (Long) value;
+                    return CodedOutputByteBufferNano.computeFixed64Size(fieldNumber, fixed64Value);
+                case TYPE_FIXED32:
+                    Integer fixed32Value = (Integer) value;
+                    return CodedOutputByteBufferNano.computeFixed32Size(fieldNumber, fixed32Value);
+                case TYPE_BOOL:
+                    Boolean boolValue = (Boolean) value;
+                    return CodedOutputByteBufferNano.computeBoolSize(fieldNumber, boolValue);
+                case TYPE_STRING:
+                    String stringValue = (String) value;
+                    return CodedOutputByteBufferNano.computeStringSize(fieldNumber, stringValue);
+                case TYPE_BYTES:
+                    byte[] bytesValue = (byte[]) value;
+                    return CodedOutputByteBufferNano.computeBytesSize(fieldNumber, bytesValue);
+                case TYPE_UINT32:
+                    Integer uint32Value = (Integer) value;
+                    return CodedOutputByteBufferNano.computeUInt32Size(fieldNumber, uint32Value);
+                case TYPE_ENUM:
+                    Integer enumValue = (Integer) value;
+                    return CodedOutputByteBufferNano.computeEnumSize(fieldNumber, enumValue);
+                case TYPE_SFIXED32:
+                    Integer sfixed32Value = (Integer) value;
+                    return CodedOutputByteBufferNano.computeSFixed32Size(fieldNumber,
+                            sfixed32Value);
+                case TYPE_SFIXED64:
+                    Long sfixed64Value = (Long) value;
+                    return CodedOutputByteBufferNano.computeSFixed64Size(fieldNumber,
+                            sfixed64Value);
+                case TYPE_SINT32:
+                    Integer sint32Value = (Integer) value;
+                    return CodedOutputByteBufferNano.computeSInt32Size(fieldNumber, sint32Value);
+                case TYPE_SINT64:
+                    Long sint64Value = (Long) value;
+                    return CodedOutputByteBufferNano.computeSInt64Size(fieldNumber, sint64Value);
+                default:
+                    throw new IllegalArgumentException("Unknown type " + type);
+            }
+        }
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/FieldArray.java

@@ -0,0 +1,273 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2014 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+
+/**
+ * A custom version of {@link android.util.SparseArray} with the minimal API
+ * for storing {@link FieldData} objects.
+ *
+ * Based on {@link android.support.v4.util.SpareArrayCompat}.
+ */
+class FieldArray {
+    private static final FieldData DELETED = new FieldData();
+    private boolean mGarbage = false;
+
+    private int[] mFieldNumbers;
+    private FieldData[] mData;
+    private int mSize;
+
+    /**
+     * Creates a new FieldArray containing no fields.
+     */
+    public FieldArray() {
+        this(10);
+    }
+
+    /**
+     * Creates a new FieldArray containing no mappings that will not
+     * require any additional memory allocation to store the specified
+     * number of mappings.
+     */
+    public FieldArray(int initialCapacity) {
+        initialCapacity = idealIntArraySize(initialCapacity);
+        mFieldNumbers = new int[initialCapacity];
+        mData = new FieldData[initialCapacity];
+        mSize = 0;
+    }
+
+    /**
+     * Gets the FieldData mapped from the specified fieldNumber, or <code>null</code>
+     * if no such mapping has been made.
+     */
+    public FieldData get(int fieldNumber) {
+        int i = binarySearch(fieldNumber);
+
+        if (i < 0 || mData[i] == DELETED) {
+            return null;
+        } else {
+            return mData[i];
+        }
+    }
+
+    /**
+     * Removes the data from the specified fieldNumber, if there was any.
+     */
+    public void remove(int fieldNumber) {
+        int i = binarySearch(fieldNumber);
+
+        if (i >= 0 && mData[i] != DELETED) {
+            mData[i] = DELETED;
+            mGarbage = true;
+        }
+    }
+
+    private void gc() {
+        int n = mSize;
+        int o = 0;
+        int[] keys = mFieldNumbers;
+        FieldData[] values = mData;
+
+        for (int i = 0; i < n; i++) {
+            FieldData val = values[i];
+
+            if (val != DELETED) {
+                if (i != o) {
+                    keys[o] = keys[i];
+                    values[o] = val;
+                    values[i] = null;
+                }
+
+                o++;
+            }
+        }
+
+        mGarbage = false;
+        mSize = o;
+    }
+
+    /**
+     * Adds a mapping from the specified fieldNumber to the specified data,
+     * replacing the previous mapping if there was one.
+     */
+    public void put(int fieldNumber, FieldData data) {
+        int i = binarySearch(fieldNumber);
+
+        if (i >= 0) {
+            mData[i] = data;
+        } else {
+            i = ~i;
+
+            if (i < mSize && mData[i] == DELETED) {
+                mFieldNumbers[i] = fieldNumber;
+                mData[i] = data;
+                return;
+            }
+
+            if (mGarbage && mSize >= mFieldNumbers.length) {
+                gc();
+
+                // Search again because indices may have changed.
+                i = ~ binarySearch(fieldNumber);
+            }
+
+            if (mSize >= mFieldNumbers.length) {
+                int n = idealIntArraySize(mSize + 1);
+
+                int[] nkeys = new int[n];
+                FieldData[] nvalues = new FieldData[n];
+
+                System.arraycopy(mFieldNumbers, 0, nkeys, 0, mFieldNumbers.length);
+                System.arraycopy(mData, 0, nvalues, 0, mData.length);
+
+                mFieldNumbers = nkeys;
+                mData = nvalues;
+            }
+
+            if (mSize - i != 0) {
+                System.arraycopy(mFieldNumbers, i, mFieldNumbers, i + 1, mSize - i);
+                System.arraycopy(mData, i, mData, i + 1, mSize - i);
+            }
+
+            mFieldNumbers[i] = fieldNumber;
+            mData[i] = data;
+            mSize++;
+        }
+    }
+
+    /**
+     * Returns the number of key-value mappings that this FieldArray
+     * currently stores.
+     */
+    public int size() {
+        if (mGarbage) {
+            gc();
+        }
+
+        return mSize;
+    }
+
+    public boolean isEmpty() {
+        return size() == 0;
+    }
+
+    /**
+     * Given an index in the range <code>0...size()-1</code>, returns
+     * the value from the <code>index</code>th key-value mapping that this
+     * FieldArray stores.
+     */
+    public FieldData dataAt(int index) {
+        if (mGarbage) {
+            gc();
+        }
+
+        return mData[index];
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        }
+        if (!(o instanceof FieldArray)) {
+            return false;
+        }
+
+        FieldArray other = (FieldArray) o;
+        if (size() != other.size()) {  // size() will call gc() if necessary.
+            return false;
+        }
+        return arrayEquals(mFieldNumbers, other.mFieldNumbers, mSize) &&
+                arrayEquals(mData, other.mData, mSize);
+    }
+
+    @Override
+    public int hashCode() {
+        if (mGarbage) {
+            gc();
+        }
+        int result = 17;
+        for (int i = 0; i < mSize; i++) {
+            result = 31 * result + mFieldNumbers[i];
+            result = 31 * result + mData[i].hashCode();
+        }
+        return result;
+    }
+
+    private int idealIntArraySize(int need) {
+        return idealByteArraySize(need * 4) / 4;
+    }
+
+    private int idealByteArraySize(int need) {
+        for (int i = 4; i < 32; i++)
+            if (need <= (1 << i) - 12)
+                return (1 << i) - 12;
+
+        return need;
+    }
+
+    private int binarySearch(int value) {
+        int lo = 0;
+        int hi = mSize - 1;
+
+        while (lo <= hi) {
+            int mid = (lo + hi) >>> 1;
+            int midVal = mFieldNumbers[mid];
+
+            if (midVal < value) {
+                lo = mid + 1;
+            } else if (midVal > value) {
+                hi = mid - 1;
+            } else {
+                return mid; // value found
+            }
+        }
+        return ~lo; // value not present
+    }
+
+    private boolean arrayEquals(int[] a, int[] b, int size) {
+        for (int i = 0; i < size; i++) {
+            if (a[i] != b[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private boolean arrayEquals(FieldData[] a, FieldData[] b, int size) {
+        for (int i = 0; i < size; i++) {
+            if (!a[i].equals(b[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/FieldData.java

@@ -0,0 +1,190 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2014 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Stores unknown fields. These might be extensions or fields that the generated API doesn't
+ * know about yet.
+ */
+class FieldData {
+    private Extension<?, ?> cachedExtension;
+    private Object value;
+    /** The serialised values for this object. Will be cleared if getValue is called */
+    private List<UnknownFieldData> unknownFieldData;
+
+    <T> FieldData(Extension<?, T> extension, T newValue) {
+        cachedExtension = extension;
+        value = newValue;
+    }
+
+    FieldData() {
+        unknownFieldData = new ArrayList<UnknownFieldData>();
+    }
+
+    void addUnknownField(UnknownFieldData unknownField) {
+        unknownFieldData.add(unknownField);
+    }
+
+    UnknownFieldData getUnknownField(int index) {
+        if (unknownFieldData == null) {
+            return null;
+        }
+        if (index < unknownFieldData.size()) {
+            return unknownFieldData.get(index);
+        }
+        return null;
+    }
+
+    int getUnknownFieldSize() {
+        if (unknownFieldData == null) {
+            return 0;
+        }
+        return unknownFieldData.size();
+    }
+
+    <T> T getValue(Extension<?, T> extension) {
+        if (value != null){
+            if (cachedExtension != extension) {  // Extension objects are singletons.
+                throw new IllegalStateException(
+                        "Tried to getExtension with a differernt Extension.");
+            }
+        } else {
+            cachedExtension = extension;
+            value = extension.getValueFrom(unknownFieldData);
+            unknownFieldData = null;
+        }
+        return (T) value;
+    }
+
+    <T> void setValue(Extension<?, T> extension, T newValue) {
+        cachedExtension = extension;
+        value = newValue;
+        unknownFieldData = null;
+    }
+
+    int computeSerializedSize() {
+        int size = 0;
+        if (value != null) {
+            size = cachedExtension.computeSerializedSize(value);
+        } else {
+            for (UnknownFieldData unknownField : unknownFieldData) {
+                size += unknownField.computeSerializedSize();
+            }
+        }
+        return size;
+    }
+
+    void writeTo(CodedOutputByteBufferNano output) throws IOException {
+        if (value != null) {
+            cachedExtension.writeTo(value, output);
+        } else {
+            for (UnknownFieldData unknownField : unknownFieldData) {
+                unknownField.writeTo(output);
+            }
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        }
+        if (!(o instanceof FieldData)) {
+            return false;
+        }
+
+        FieldData other = (FieldData) o;
+        if (value != null && other.value != null) {
+            // If both objects have deserialized values, compare those.
+            // Since unknown fields are only compared if messages have generated equals methods
+            // we know this will be a meaningful comparison (not identity) for all values.
+            if (cachedExtension != other.cachedExtension) {  // Extension objects are singletons.
+                return false;
+            }
+            if (!cachedExtension.clazz.isArray()) {
+                // Can't test (!cachedExtension.repeated) due to 'bytes' -> 'byte[]'
+                return value.equals(other.value);
+            }
+            if (value instanceof byte[]) {
+                return Arrays.equals((byte[]) value, (byte[]) other.value);
+            } else if (value instanceof int[]) {
+                return Arrays.equals((int[]) value, (int[]) other.value);
+            } else if (value instanceof long[]) {
+                return Arrays.equals((long[]) value, (long[]) other.value);
+            } else if (value instanceof float[]) {
+                return Arrays.equals((float[]) value, (float[]) other.value);
+            } else if (value instanceof double[]) {
+                return Arrays.equals((double[]) value, (double[]) other.value);
+            } else if (value instanceof boolean[]) {
+                return Arrays.equals((boolean[]) value, (boolean[]) other.value);
+            } else {
+                return Arrays.deepEquals((Object[]) value, (Object[]) other.value);
+            }
+        }
+        if (unknownFieldData != null && other.unknownFieldData != null) {
+            // If both objects have byte arrays compare those directly.
+            return unknownFieldData.equals(other.unknownFieldData);
+        }
+        try {
+            // As a last resort, serialize and compare the resulting byte arrays.
+            return Arrays.equals(toByteArray(), other.toByteArray());
+        } catch (IOException e) {
+            // Should not happen.
+            throw new IllegalStateException(e);
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 17;
+        try {
+            // The only way to generate a consistent hash is to use the serialized form.
+            result = 31 * result + Arrays.hashCode(toByteArray());
+        } catch (IOException e) {
+            // Should not happen.
+            throw new IllegalStateException(e);
+        }
+        return result;
+    }
+
+    private byte[] toByteArray() throws IOException {
+        byte[] result = new byte[computeSerializedSize()];
+        CodedOutputByteBufferNano output = CodedOutputByteBufferNano.newInstance(result);
+        writeTo(output);
+        return result;
+    }
+
+}

javanano/src/main/java/com/google/protobuf/nano/InternalNano.java

@@ -0,0 +1,333 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.UnsupportedEncodingException;
+import java.util.Arrays;
+
+/**
+ * The classes contained within are used internally by the Protocol Buffer
+ * library and generated message implementations. They are public only because
+ * those generated messages do not reside in the {@code protobuf} package.
+ * Others should not use this class directly.
+ *
+ * @author kenton@google.com (Kenton Varda)
+ */
+public final class InternalNano {
+
+  private InternalNano() {}
+
+  /**
+   * An object to provide synchronization when lazily initializing static fields
+   * of {@link MessageNano} subclasses.
+   * <p>
+   * To enable earlier versions of ProGuard to inline short methods from a
+   * generated MessageNano subclass to the call sites, that class must not have
+   * a class initializer, which will be created if there is any static variable
+   * initializers. To lazily initialize the static variables in a thread-safe
+   * manner, the initialization code will synchronize on this object.
+   */
+  public static final Object LAZY_INIT_LOCK = new Object();
+
+  /**
+   * Helper called by generated code to construct default values for string
+   * fields.
+   * <p>
+   * The protocol compiler does not actually contain a UTF-8 decoder -- it
+   * just pushes UTF-8-encoded text around without touching it.  The one place
+   * where this presents a problem is when generating Java string literals.
+   * Unicode characters in the string literal would normally need to be encoded
+   * using a Unicode escape sequence, which would require decoding them.
+   * To get around this, protoc instead embeds the UTF-8 bytes into the
+   * generated code and leaves it to the runtime library to decode them.
+   * <p>
+   * It gets worse, though.  If protoc just generated a byte array, like:
+   *   new byte[] {0x12, 0x34, 0x56, 0x78}
+   * Java actually generates *code* which allocates an array and then fills
+   * in each value.  This is much less efficient than just embedding the bytes
+   * directly into the bytecode.  To get around this, we need another
+   * work-around.  String literals are embedded directly, so protoc actually
+   * generates a string literal corresponding to the bytes.  The easiest way
+   * to do this is to use the ISO-8859-1 character set, which corresponds to
+   * the first 256 characters of the Unicode range.  Protoc can then use
+   * good old CEscape to generate the string.
+   * <p>
+   * So we have a string literal which represents a set of bytes which
+   * represents another string.  This function -- stringDefaultValue --
+   * converts from the generated string to the string we actually want.  The
+   * generated code calls this automatically.
+   */
+  public static String stringDefaultValue(String bytes) {
+    try {
+      return new String(bytes.getBytes("ISO-8859-1"), "UTF-8");
+    } catch (UnsupportedEncodingException e) {
+      // This should never happen since all JVMs are required to implement
+      // both of the above character sets.
+      throw new IllegalStateException(
+          "Java VM does not support a standard character set.", e);
+    }
+  }
+
+  /**
+   * Helper called by generated code to construct default values for bytes
+   * fields.
+   * <p>
+   * This is a lot like {@link #stringDefaultValue}, but for bytes fields.
+   * In this case we only need the second of the two hacks -- allowing us to
+   * embed raw bytes as a string literal with ISO-8859-1 encoding.
+   */
+  public static byte[] bytesDefaultValue(String bytes) {
+    try {
+      return bytes.getBytes("ISO-8859-1");
+    } catch (UnsupportedEncodingException e) {
+      // This should never happen since all JVMs are required to implement
+      // ISO-8859-1.
+      throw new IllegalStateException(
+          "Java VM does not support a standard character set.", e);
+    }
+  }
+
+  /**
+   * Helper function to convert a string into UTF-8 while turning the
+   * UnsupportedEncodingException to a RuntimeException.
+   */
+  public static byte[] copyFromUtf8(final String text) {
+    try {
+      return text.getBytes("UTF-8");
+    } catch (UnsupportedEncodingException e) {
+      throw new RuntimeException("UTF-8 not supported?");
+    }
+  }
+
+  /**
+   * Checks repeated int field equality; null-value and 0-length fields are
+   * considered equal.
+   */
+  public static boolean equals(int[] field1, int[] field2) {
+    if (field1 == null || field1.length == 0) {
+      return field2 == null || field2.length == 0;
+    } else {
+      return Arrays.equals(field1, field2);
+    }
+  }
+
+  /**
+   * Checks repeated long field equality; null-value and 0-length fields are
+   * considered equal.
+   */
+  public static boolean equals(long[] field1, long[] field2) {
+    if (field1 == null || field1.length == 0) {
+      return field2 == null || field2.length == 0;
+    } else {
+      return Arrays.equals(field1, field2);
+    }
+  }
+
+  /**
+   * Checks repeated float field equality; null-value and 0-length fields are
+   * considered equal.
+   */
+  public static boolean equals(float[] field1, float[] field2) {
+    if (field1 == null || field1.length == 0) {
+      return field2 == null || field2.length == 0;
+    } else {
+      return Arrays.equals(field1, field2);
+    }
+  }
+
+  /**
+   * Checks repeated double field equality; null-value and 0-length fields are
+   * considered equal.
+   */
+  public static boolean equals(double[] field1, double[] field2) {
+    if (field1 == null || field1.length == 0) {
+      return field2 == null || field2.length == 0;
+    } else {
+      return Arrays.equals(field1, field2);
+    }
+  }
+
+  /**
+   * Checks repeated boolean field equality; null-value and 0-length fields are
+   * considered equal.
+   */
+  public static boolean equals(boolean[] field1, boolean[] field2) {
+    if (field1 == null || field1.length == 0) {
+      return field2 == null || field2.length == 0;
+    } else {
+      return Arrays.equals(field1, field2);
+    }
+  }
+
+  /**
+   * Checks repeated bytes field equality. Only non-null elements are tested.
+   * Returns true if the two fields have the same sequence of non-null
+   * elements. Null-value fields and fields of any length with only null
+   * elements are considered equal.
+   */
+  public static boolean equals(byte[][] field1, byte[][] field2) {
+    int index1 = 0;
+    int length1 = field1 == null ? 0 : field1.length;
+    int index2 = 0;
+    int length2 = field2 == null ? 0 : field2.length;
+    while (true) {
+      while (index1 < length1 && field1[index1] == null) {
+        index1++;
+      }
+      while (index2 < length2 && field2[index2] == null) {
+        index2++;
+      }
+      boolean atEndOf1 = index1 >= length1;
+      boolean atEndOf2 = index2 >= length2;
+      if (atEndOf1 && atEndOf2) {
+        // no more non-null elements to test in both arrays
+        return true;
+      } else if (atEndOf1 != atEndOf2) {
+        // one of the arrays have extra non-null elements
+        return false;
+      } else if (!Arrays.equals(field1[index1], field2[index2])) {
+        // element mismatch
+        return false;
+      }
+      index1++;
+      index2++;
+    }
+  }
+
+  /**
+   * Checks repeated string/message field equality. Only non-null elements are
+   * tested. Returns true if the two fields have the same sequence of non-null
+   * elements. Null-value fields and fields of any length with only null
+   * elements are considered equal.
+   */
+  public static boolean equals(Object[] field1, Object[] field2) {
+    int index1 = 0;
+    int length1 = field1 == null ? 0 : field1.length;
+    int index2 = 0;
+    int length2 = field2 == null ? 0 : field2.length;
+    while (true) {
+      while (index1 < length1 && field1[index1] == null) {
+        index1++;
+      }
+      while (index2 < length2 && field2[index2] == null) {
+        index2++;
+      }
+      boolean atEndOf1 = index1 >= length1;
+      boolean atEndOf2 = index2 >= length2;
+      if (atEndOf1 && atEndOf2) {
+        // no more non-null elements to test in both arrays
+        return true;
+      } else if (atEndOf1 != atEndOf2) {
+        // one of the arrays have extra non-null elements
+        return false;
+      } else if (!field1[index1].equals(field2[index2])) {
+        // element mismatch
+        return false;
+      }
+      index1++;
+      index2++;
+    }
+  }
+
+  /**
+   * Computes the hash code of a repeated int field. Null-value and 0-length
+   * fields have the same hash code.
+   */
+  public static int hashCode(int[] field) {
+    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
+  }
+
+  /**
+   * Computes the hash code of a repeated long field. Null-value and 0-length
+   * fields have the same hash code.
+   */
+  public static int hashCode(long[] field) {
+    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
+  }
+
+  /**
+   * Computes the hash code of a repeated float field. Null-value and 0-length
+   * fields have the same hash code.
+   */
+  public static int hashCode(float[] field) {
+    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
+  }
+
+  /**
+   * Computes the hash code of a repeated double field. Null-value and 0-length
+   * fields have the same hash code.
+   */
+  public static int hashCode(double[] field) {
+    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
+  }
+
+  /**
+   * Computes the hash code of a repeated boolean field. Null-value and 0-length
+   * fields have the same hash code.
+   */
+  public static int hashCode(boolean[] field) {
+    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
+  }
+
+  /**
+   * Computes the hash code of a repeated bytes field. Only the sequence of all
+   * non-null elements are used in the computation. Null-value fields and fields
+   * of any length with only null elements have the same hash code.
+   */
+  public static int hashCode(byte[][] field) {
+    int result = 0;
+    for (int i = 0, size = field == null ? 0 : field.length; i < size; i++) {
+      byte[] element = field[i];
+      if (element != null) {
+        result = 31 * result + Arrays.hashCode(element);
+      }
+    }
+    return result;
+  }
+
+  /**
+   * Computes the hash code of a repeated string/message field. Only the
+   * sequence of all non-null elements are used in the computation. Null-value
+   * fields and fields of any length with only null elements have the same hash
+   * code.
+   */
+  public static int hashCode(Object[] field) {
+    int result = 0;
+    for (int i = 0, size = field == null ? 0 : field.length; i < size; i++) {
+      Object element = field[i];
+      if (element != null) {
+        result = 31 * result + element.hashCode();
+      }
+    }
+    return result;
+  }
+
+}

javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java

@@ -0,0 +1,93 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+
+/**
+ * Thrown when a protocol message being parsed is invalid in some way,
+ * e.g. it contains a malformed varint or a negative byte length.
+ *
+ * @author kenton@google.com Kenton Varda
+ */
+public class InvalidProtocolBufferNanoException extends IOException {
+  private static final long serialVersionUID = -1616151763072450476L;
+
+  public InvalidProtocolBufferNanoException(final String description) {
+    super(description);
+  }
+
+  static InvalidProtocolBufferNanoException truncatedMessage() {
+    return new InvalidProtocolBufferNanoException(
+      "While parsing a protocol message, the input ended unexpectedly " +
+      "in the middle of a field.  This could mean either than the " +
+      "input has been truncated or that an embedded message " +
+      "misreported its own length.");
+  }
+
+  static InvalidProtocolBufferNanoException negativeSize() {
+    return new InvalidProtocolBufferNanoException(
+      "CodedInputStream encountered an embedded string or message " +
+      "which claimed to have negative size.");
+  }
+
+  static InvalidProtocolBufferNanoException malformedVarint() {
+    return new InvalidProtocolBufferNanoException(
+      "CodedInputStream encountered a malformed varint.");
+  }
+
+  static InvalidProtocolBufferNanoException invalidTag() {
+    return new InvalidProtocolBufferNanoException(
+      "Protocol message contained an invalid tag (zero).");
+  }
+
+  static InvalidProtocolBufferNanoException invalidEndTag() {
+    return new InvalidProtocolBufferNanoException(
+      "Protocol message end-group tag did not match expected tag.");
+  }
+
+  static InvalidProtocolBufferNanoException invalidWireType() {
+    return new InvalidProtocolBufferNanoException(
+      "Protocol message tag had invalid wire type.");
+  }
+
+  static InvalidProtocolBufferNanoException recursionLimitExceeded() {
+    return new InvalidProtocolBufferNanoException(
+      "Protocol message had too many levels of nesting.  May be malicious.  " +
+      "Use CodedInputStream.setRecursionLimit() to increase the depth limit.");
+  }
+
+  static InvalidProtocolBufferNanoException sizeLimitExceeded() {
+    return new InvalidProtocolBufferNanoException(
+      "Protocol message was too large.  May be malicious.  " +
+      "Use CodedInputStream.setSizeLimit() to increase the size limit.");
+  }
+}

javanano/src/main/java/com/google/protobuf/nano/MessageNano.java

@@ -0,0 +1,190 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Abstract interface implemented by Protocol Message objects.
+ *
+ * @author wink@google.com Wink Saville
+ */
+public abstract class MessageNano {
+    protected volatile int cachedSize = -1;
+
+    /**
+     * Get the number of bytes required to encode this message.
+     * Returns the cached size or calls getSerializedSize which
+     * sets the cached size. This is used internally when serializing
+     * so the size is only computed once. If a member is modified
+     * then this could be stale call getSerializedSize if in doubt.
+     */
+    public int getCachedSize() {
+        if (cachedSize < 0) {
+            // getSerializedSize sets cachedSize
+            getSerializedSize();
+        }
+        return cachedSize;
+    }
+
+    /**
+     * Computes the number of bytes required to encode this message.
+     * The size is cached and the cached result can be retrieved
+     * using getCachedSize().
+     */
+    public int getSerializedSize() {
+        int size = computeSerializedSize();
+        cachedSize = size;
+        return size;
+    }
+
+    /**
+     * Computes the number of bytes required to encode this message. This does not update the
+     * cached size.
+     */
+    protected int computeSerializedSize() {
+      // This is overridden if the generated message has serialized fields.
+      return 0;
+    }
+
+    /**
+     * Serializes the message and writes it to {@code output}.
+     *
+     * @param output the output to receive the serialized form.
+     * @throws IOException if an error occurred writing to {@code output}.
+     */
+    public void writeTo(CodedOutputByteBufferNano output) throws IOException {
+        // Does nothing by default. Overridden by subclasses which have data to write.
+    }
+
+    /**
+     * Parse {@code input} as a message of this type and merge it with the
+     * message being built.
+     */
+    public abstract MessageNano mergeFrom(CodedInputByteBufferNano input) throws IOException;
+
+    /**
+     * Serialize to a byte array.
+     * @return byte array with the serialized data.
+     */
+    public static final byte[] toByteArray(MessageNano msg) {
+        final byte[] result = new byte[msg.getSerializedSize()];
+        toByteArray(msg, result, 0, result.length);
+        return result;
+    }
+
+    /**
+     * Serialize to a byte array starting at offset through length. The
+     * method getSerializedSize must have been called prior to calling
+     * this method so the proper length is know.  If an attempt to
+     * write more than length bytes OutOfSpaceException will be thrown
+     * and if length bytes are not written then IllegalStateException
+     * is thrown.
+     */
+    public static final void toByteArray(MessageNano msg, byte[] data, int offset, int length) {
+        try {
+            final CodedOutputByteBufferNano output =
+                CodedOutputByteBufferNano.newInstance(data, offset, length);
+            msg.writeTo(output);
+            output.checkNoSpaceLeft();
+        } catch (IOException e) {
+            throw new RuntimeException("Serializing to a byte array threw an IOException "
+                    + "(should never happen).", e);
+        }
+    }
+
+    /**
+     * Parse {@code data} as a message of this type and merge it with the
+     * message being built.
+     */
+    public static final <T extends MessageNano> T mergeFrom(T msg, final byte[] data)
+        throws InvalidProtocolBufferNanoException {
+        return mergeFrom(msg, data, 0, data.length);
+    }
+
+    /**
+     * Parse {@code data} as a message of this type and merge it with the
+     * message being built.
+     */
+    public static final <T extends MessageNano> T mergeFrom(T msg, final byte[] data,
+            final int off, final int len) throws InvalidProtocolBufferNanoException {
+        try {
+            final CodedInputByteBufferNano input =
+                CodedInputByteBufferNano.newInstance(data, off, len);
+            msg.mergeFrom(input);
+            input.checkLastTagWas(0);
+            return msg;
+        } catch (InvalidProtocolBufferNanoException e) {
+            throw e;
+        } catch (IOException e) {
+            throw new RuntimeException("Reading from a byte array threw an IOException (should "
+                    + "never happen).");
+        }
+    }
+
+    /**
+     * Compares two {@code MessageNano}s and returns true if the message's are the same class and
+     * have serialized form equality (i.e. all of the field values are the same).
+     */
+    public static final boolean messageNanoEquals(MessageNano a, MessageNano b) {
+        if (a == b) {
+            return true;
+        }
+        if (a == null || b == null) {
+            return false;
+        }
+        if (a.getClass() != b.getClass()) {
+          return false;
+        }
+        final int serializedSize = a.getSerializedSize();
+        if (b.getSerializedSize() != serializedSize) {
+            return false;
+        }
+        final byte[] aByteArray = new byte[serializedSize];
+        final byte[] bByteArray = new byte[serializedSize];
+        toByteArray(a, aByteArray, 0, serializedSize);
+        toByteArray(b, bByteArray, 0, serializedSize);
+        return Arrays.equals(aByteArray, bByteArray);
+    }
+
+    /**
+     * Returns a string that is (mostly) compatible with ProtoBuffer's TextFormat. Note that groups
+     * (which are deprecated) are not serialized with the correct field name.
+     *
+     * <p>This is implemented using reflection, so it is not especially fast nor is it guaranteed
+     * to find all fields if you have method removal turned on for proguard.
+     */
+    @Override
+    public String toString() {
+        return MessageNanoPrinter.print(this);
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java

@@ -0,0 +1,257 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+/**
+ * Static helper methods for printing nano protos.
+ *
+ * @author flynn@google.com Andrew Flynn
+ */
+public final class MessageNanoPrinter {
+    // Do not allow instantiation
+    private MessageNanoPrinter() {}
+
+    private static final String INDENT = "  ";
+    private static final int MAX_STRING_LEN = 200;
+
+    /**
+     * Returns an text representation of a MessageNano suitable for debugging. The returned string
+     * is mostly compatible with Protocol Buffer's TextFormat (as provided by non-nano protocol
+     * buffers) -- groups (which are deprecated) are output with an underscore name (e.g. foo_bar
+     * instead of FooBar) and will thus not parse.
+     *
+     * <p>Employs Java reflection on the given object and recursively prints primitive fields,
+     * groups, and messages.</p>
+     */
+    public static <T extends MessageNano> String print(T message) {
+        if (message == null) {
+            return "";
+        }
+
+        StringBuffer buf = new StringBuffer();
+        try {
+            print(null, message, new StringBuffer(), buf);
+        } catch (IllegalAccessException e) {
+            return "Error printing proto: " + e.getMessage();
+        } catch (InvocationTargetException e) {
+            return "Error printing proto: " + e.getMessage();
+        }
+        return buf.toString();
+    }
+
+    /**
+     * Function that will print the given message/field into the StringBuffer.
+     * Meant to be called recursively.
+     *
+     * @param identifier the identifier to use, or {@code null} if this is the root message to
+     *        print.
+     * @param object the value to print. May in fact be a primitive value or byte array and not a
+     *        message.
+     * @param indentBuf the indentation each line should begin with.
+     * @param buf the output buffer.
+     */
+    private static void print(String identifier, Object object,
+            StringBuffer indentBuf, StringBuffer buf) throws IllegalAccessException,
+            InvocationTargetException {
+        if (object == null) {
+            // This can happen if...
+            //   - we're about to print a message, String, or byte[], but it not present;
+            //   - we're about to print a primitive, but "reftype" optional style is enabled, and
+            //     the field is unset.
+            // In both cases the appropriate behavior is to output nothing.
+        } else if (object instanceof MessageNano) {  // Nano proto message
+            int origIndentBufLength = indentBuf.length();
+            if (identifier != null) {
+                buf.append(indentBuf).append(deCamelCaseify(identifier)).append(" <\n");
+                indentBuf.append(INDENT);
+            }
+            Class<?> clazz = object.getClass();
+
+            // Proto fields follow one of two formats:
+            //
+            // 1) Public, non-static variables that do not begin or end with '_'
+            // Find and print these using declared public fields
+            for (Field field : clazz.getFields()) {
+                int modifiers = field.getModifiers();
+                String fieldName = field.getName();
+
+                if ((modifiers & Modifier.PUBLIC) == Modifier.PUBLIC
+                        && (modifiers & Modifier.STATIC) != Modifier.STATIC
+                        && !fieldName.startsWith("_")
+                        && !fieldName.endsWith("_")) {
+                    Class<?> fieldType = field.getType();
+                    Object value = field.get(object);
+
+                    if (fieldType.isArray()) {
+                        Class<?> arrayType = fieldType.getComponentType();
+
+                        // bytes is special since it's not repeated, but is represented by an array
+                        if (arrayType == byte.class) {
+                            print(fieldName, value, indentBuf, buf);
+                        } else {
+                            int len = value == null ? 0 : Array.getLength(value);
+                            for (int i = 0; i < len; i++) {
+                                Object elem = Array.get(value, i);
+                                print(fieldName, elem, indentBuf, buf);
+                            }
+                        }
+                    } else {
+                        print(fieldName, value, indentBuf, buf);
+                    }
+                }
+            }
+
+            // 2) Fields that are accessed via getter methods (when accessors
+            //    mode is turned on)
+            // Find and print these using getter methods.
+            for (Method method : clazz.getMethods()) {
+                String name = method.getName();
+                // Check for the setter accessor method since getters and hazzers both have
+                // non-proto-field name collisions (hashCode() and getSerializedSize())
+                if (name.startsWith("set")) {
+                    String subfieldName = name.substring(3);
+
+                    Method hazzer = null;
+                    try {
+                        hazzer = clazz.getMethod("has" + subfieldName);
+                    } catch (NoSuchMethodException e) {
+                        continue;
+                    }
+                    // If hazzer does't exist or returns false, no need to continue
+                    if (!(Boolean) hazzer.invoke(object)) {
+                        continue;
+                    }
+
+                    Method getter = null;
+                    try {
+                        getter = clazz.getMethod("get" + subfieldName);
+                    } catch (NoSuchMethodException e) {
+                        continue;
+                    }
+
+                    print(subfieldName, getter.invoke(object), indentBuf, buf);
+                }
+            }
+            if (identifier != null) {
+                indentBuf.setLength(origIndentBufLength);
+                buf.append(indentBuf).append(">\n");
+            }
+        } else {
+            // Non-null primitive value
+            identifier = deCamelCaseify(identifier);
+            buf.append(indentBuf).append(identifier).append(": ");
+            if (object instanceof String) {
+                String stringMessage = sanitizeString((String) object);
+                buf.append("\"").append(stringMessage).append("\"");
+            } else if (object instanceof byte[]) {
+                appendQuotedBytes((byte[]) object, buf);
+            } else {
+                buf.append(object);
+            }
+            buf.append("\n");
+        }
+    }
+
+    /**
+     * Converts an identifier of the format "FieldName" into "field_name".
+     */
+    private static String deCamelCaseify(String identifier) {
+        StringBuffer out = new StringBuffer();
+        for (int i = 0; i < identifier.length(); i++) {
+            char currentChar = identifier.charAt(i);
+            if (i == 0) {
+                out.append(Character.toLowerCase(currentChar));
+            } else if (Character.isUpperCase(currentChar)) {
+                out.append('_').append(Character.toLowerCase(currentChar));
+            } else {
+                out.append(currentChar);
+            }
+        }
+        return out.toString();
+    }
+
+    /**
+     * Shortens and escapes the given string.
+     */
+    private static String sanitizeString(String str) {
+        if (!str.startsWith("http") && str.length() > MAX_STRING_LEN) {
+            // Trim non-URL strings.
+            str = str.substring(0, MAX_STRING_LEN) + "[...]";
+        }
+        return escapeString(str);
+    }
+
+    /**
+     * Escape everything except for low ASCII code points.
+     */
+    private static String escapeString(String str) {
+        int strLen = str.length();
+        StringBuilder b = new StringBuilder(strLen);
+        for (int i = 0; i < strLen; i++) {
+            char original = str.charAt(i);
+            if (original >= ' ' && original <= '~' && original != '"' && original != '\'') {
+                b.append(original);
+            } else {
+                b.append(String.format("\\u%04x", (int) original));
+            }
+        }
+        return b.toString();
+    }
+
+    /**
+     * Appends a quoted byte array to the provided {@code StringBuffer}.
+     */
+    private static void appendQuotedBytes(byte[] bytes, StringBuffer builder) {
+        if (bytes == null) {
+            builder.append("\"\"");
+            return;
+        }
+
+        builder.append('"');
+        for (int i = 0; i < bytes.length; ++i) {
+            int ch = bytes[i] & 0xff;
+            if (ch == '\\' || ch == '"') {
+                builder.append('\\').append((char) ch);
+            } else if (ch >= 32 && ch < 127) {
+                builder.append((char) ch);
+            } else {
+                builder.append(String.format("\\%03o", ch));
+            }
+        }
+        builder.append('"');
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java

@@ -0,0 +1,84 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Stores unknown fields. These might be extensions or fields that the generated
+ * API doesn't know about yet.
+ *
+ * @author bduff@google.com (Brian Duff)
+ */
+final class UnknownFieldData {
+
+    final int tag;
+    final byte[] bytes;
+
+    UnknownFieldData(int tag, byte[] bytes) {
+        this.tag = tag;
+        this.bytes = bytes;
+    }
+
+    int computeSerializedSize() {
+        int size = 0;
+        size += CodedOutputByteBufferNano.computeRawVarint32Size(tag);
+        size += bytes.length;
+        return size;
+    }
+
+    void writeTo(CodedOutputByteBufferNano output) throws IOException {
+        output.writeRawVarint32(tag);
+        output.writeRawBytes(bytes);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        }
+        if (!(o instanceof UnknownFieldData)) {
+            return false;
+        }
+
+        UnknownFieldData other = (UnknownFieldData) o;
+        return tag == other.tag && Arrays.equals(bytes, other.bytes);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 17;
+        result = 31 * result + tag;
+        result = 31 * result + Arrays.hashCode(bytes);
+        return result;
+    }
+}

javanano/src/main/java/com/google/protobuf/nano/WireFormatNano.java

@@ -0,0 +1,124 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+
+/**
+ * This class is used internally by the Protocol Buffer library and generated
+ * message implementations.  It is public only because those generated messages
+ * do not reside in the {@code protobuf} package.  Others should not use this
+ * class directly.
+ *
+ * This class contains constants and helper functions useful for dealing with
+ * the Protocol Buffer wire format.
+ *
+ * @author kenton@google.com Kenton Varda
+ */
+public final class WireFormatNano {
+  // Do not allow instantiation.
+  private WireFormatNano() {}
+
+  static final int WIRETYPE_VARINT           = 0;
+  static final int WIRETYPE_FIXED64          = 1;
+  static final int WIRETYPE_LENGTH_DELIMITED = 2;
+  static final int WIRETYPE_START_GROUP      = 3;
+  static final int WIRETYPE_END_GROUP        = 4;
+  static final int WIRETYPE_FIXED32          = 5;
+
+  static final int TAG_TYPE_BITS = 3;
+  static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1;
+
+  /** Given a tag value, determines the wire type (the lower 3 bits). */
+  static int getTagWireType(final int tag) {
+    return tag & TAG_TYPE_MASK;
+  }
+
+  /** Given a tag value, determines the field number (the upper 29 bits). */
+  public static int getTagFieldNumber(final int tag) {
+    return tag >>> TAG_TYPE_BITS;
+  }
+
+  /** Makes a tag value given a field number and wire type. */
+  static int makeTag(final int fieldNumber, final int wireType) {
+    return (fieldNumber << TAG_TYPE_BITS) | wireType;
+  }
+
+  public static final int EMPTY_INT_ARRAY[] = {};
+  public static final long EMPTY_LONG_ARRAY[] = {};
+  public static final float EMPTY_FLOAT_ARRAY[] = {};
+  public static final double EMPTY_DOUBLE_ARRAY[] = {};
+  public static final boolean EMPTY_BOOLEAN_ARRAY[] = {};
+  public static final String EMPTY_STRING_ARRAY[] = {};
+  public static final byte[] EMPTY_BYTES_ARRAY[] = {};
+  public static final byte[] EMPTY_BYTES = {};
+
+  /**
+   * Parses an unknown field. This implementation skips the field.
+   *
+   * <p>Generated messages will call this for unknown fields if the store_unknown_fields
+   * option is off.
+   *
+   * @return {@literal true} unless the tag is an end-group tag.
+   */
+  public static boolean parseUnknownField(
+      final CodedInputByteBufferNano input,
+      final int tag) throws IOException {
+    return input.skipField(tag);
+  }
+
+  /**
+   * Computes the array length of a repeated field. We assume that in the common case repeated
+   * fields are contiguously serialized but we still correctly handle interspersed values of a
+   * repeated field (but with extra allocations).
+   *
+   * Rewinds to current input position before returning.
+   *
+   * @param input stream input, pointing to the byte after the first tag
+   * @param tag repeated field tag just read
+   * @return length of array
+   * @throws IOException
+   */
+  public static final int getRepeatedFieldArrayLength(
+      final CodedInputByteBufferNano input,
+      final int tag) throws IOException {
+    int arrayLength = 1;
+    int startPos = input.getPosition();
+    input.skipField(tag);
+    while (input.readTag() == tag) {
+      input.skipField(tag);
+      arrayLength++;
+    }
+    input.rewindToPosition(startPos);
+    return arrayLength;
+  }
+
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto

@@ -0,0 +1,118 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "NanoAccessorsOuterClass";
+
+message TestNanoAccessors {
+
+  message NestedMessage {
+    optional int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  // Singular
+  optional int32  optional_int32    =  1;
+  optional float  optional_float    = 11;
+  optional double optional_double   = 12;
+  optional string optional_string   = 14;
+  optional bytes  optional_bytes    = 15;
+
+  optional NestedMessage optional_nested_message = 18;
+
+  optional NestedEnum optional_nested_enum = 21;
+
+  // Repeated
+  repeated int32  repeated_int32    = 31;
+  repeated string repeated_string   = 44;
+  repeated bytes  repeated_bytes    = 45;
+
+  repeated NestedMessage repeated_nested_message  = 48;
+
+  repeated NestedEnum repeated_nested_enum  = 51;
+
+  // Singular with defaults
+  optional int32  default_int32    = 61 [default =  41    ];
+  optional string default_string   = 74 [default = "hello"];
+  optional bytes  default_bytes    = 75 [default = "world"];
+
+  optional float default_float_nan = 99  [default =  nan];
+
+  optional NestedEnum default_nested_enum = 81 [default = BAR];
+
+  // Required
+  required int32 id = 86;
+
+  // Add enough optional fields to make 2 bit fields in total
+  optional int32 filler100 = 100;
+  optional int32 filler101 = 101;
+  optional int32 filler102 = 102;
+  optional int32 filler103 = 103;
+  optional int32 filler104 = 104;
+  optional int32 filler105 = 105;
+  optional int32 filler106 = 106;
+  optional int32 filler107 = 107;
+  optional int32 filler108 = 108;
+  optional int32 filler109 = 109;
+  optional int32 filler110 = 110;
+  optional int32 filler111 = 111;
+  optional int32 filler112 = 112;
+  optional int32 filler113 = 113;
+  optional int32 filler114 = 114;
+  optional int32 filler115 = 115;
+  optional int32 filler116 = 116;
+  optional int32 filler117 = 117;
+  optional int32 filler118 = 118;
+  optional int32 filler119 = 119;
+  optional int32 filler120 = 120;
+  optional int32 filler121 = 121;
+  optional int32 filler122 = 122;
+  optional int32 filler123 = 123;
+  optional int32 filler124 = 124;
+  optional int32 filler125 = 125;
+  optional int32 filler126 = 126;
+  optional int32 filler127 = 127;
+  optional int32 filler128 = 128;
+  optional int32 filler129 = 129;
+  optional int32 filler130 = 130;
+
+  optional int32 before_bit_field_check = 139;
+  optional int32 bit_field_check = 140;
+  optional int32 after_bit_field_check = 141;
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto

@@ -0,0 +1,48 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_multiple_files = true;
+
+enum FileScopeEnumMultiple {
+  THREE = 3;
+}
+
+message EnumClassNanoMultiple {
+  enum MessageScopeEnumMultiple {
+    FOUR = 4;
+  }
+  optional FileScopeEnumMultiple three = 3 [ default = THREE ];
+  optional MessageScopeEnumMultiple four = 4 [ default = FOUR ];
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto

@@ -0,0 +1,48 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "EnumClassNanos";
+
+enum FileScopeEnum {
+  ONE = 1;
+}
+
+message EnumClassNano {
+  enum MessageScopeEnum {
+    TWO = 2;
+  }
+  optional FileScopeEnum one = 1 [ default = ONE ];
+  optional MessageScopeEnum two = 2 [ default = TWO ];
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto

@@ -0,0 +1,28 @@
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "EnumValidity";
+
+enum E {
+  default = 1; // test java keyword renaming
+  FOO = 2;
+  BAR = 3;
+  BAZ = 4;
+}
+
+message M {
+  optional E optional_e = 1;
+  optional E default_e = 2 [ default = BAZ ];
+  repeated E repeated_e = 3;
+  repeated E packed_e = 4 [ packed = true ];
+  repeated E repeated_e2 = 5;
+  repeated E packed_e2 = 6 [ packed = true ];
+  repeated E repeated_e3 = 7;
+  repeated E packed_e3 = 8 [ packed = true ];
+}
+
+message Alt {
+  optional E repeated_e2_as_optional = 5;
+  repeated E packed_e2_as_non_packed = 6;
+  repeated E non_packed_e3_as_packed = 7 [ packed = true ];
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto

@@ -0,0 +1,33 @@
+syntax = "proto2";
+
+option java_outer_classname = "Extensions";
+option java_package = "com.google.protobuf.nano.testext";
+
+message ExtendableMessage {
+  optional int32 field = 1;
+  extensions 10 to max;
+}
+
+enum AnEnum {
+  FIRST_VALUE = 1;
+  SECOND_VALUE = 2;
+}
+
+message AnotherMessage {
+  optional string string = 1;
+  optional bool value = 2;
+}
+
+message ContainerMessage {
+  extend ExtendableMessage {
+    optional bool another_thing = 100;
+  }
+}
+
+// For testNanoOptionalGroupWithUnknownFieldsEnabled;
+// not part of the extensions tests.
+message MessageWithGroup {
+  optional group Group = 1 {
+    optional int32 a = 2;
+  }
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto

@@ -0,0 +1,29 @@
+syntax = "proto2";
+
+option java_multiple_files = true;
+option java_package = "com.google.protobuf.nano";
+
+import "google/protobuf/nano/unittest_extension_nano.proto";
+
+// Must be compiled separately due to extension number reuse.
+// The reuse is deliberate, for testing wire compatibility.
+
+message PackedExtensions {
+  extend ExtendableMessage {
+    repeated int32    packed_int32    = 10 [ packed = true ];
+    repeated uint32   packed_uint32   = 11 [ packed = true ];
+    repeated sint32   packed_sint32   = 12 [ packed = true ];
+    repeated int64    packed_int64    = 13 [ packed = true ];
+    repeated uint64   packed_uint64   = 14 [ packed = true ];
+    repeated sint64   packed_sint64   = 15 [ packed = true ];
+    repeated fixed32  packed_fixed32  = 16 [ packed = true ];
+    repeated sfixed32 packed_sfixed32 = 17 [ packed = true ];
+    repeated fixed64  packed_fixed64  = 18 [ packed = true ];
+    repeated sfixed64 packed_sfixed64 = 19 [ packed = true ];
+    repeated bool     packed_bool     = 20 [ packed = true ];
+    repeated float    packed_float    = 21 [ packed = true ];
+    repeated double   packed_double   = 22 [ packed = true ];
+    repeated AnEnum   packed_enum     = 23 [ packed = true ];
+    // Non-packable types omitted.
+  }
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto

@@ -0,0 +1,34 @@
+syntax = "proto2";
+
+option java_multiple_files = true;
+option java_package = "com.google.protobuf.nano";
+
+import "google/protobuf/nano/unittest_extension_nano.proto";
+
+// Must be compiled separately due to extension number reuse.
+// The reuse is deliberate, for testing wire compatibility.
+
+message RepeatedExtensions {
+  extend ExtendableMessage {
+    repeated int32          repeated_int32    = 10;
+    repeated uint32         repeated_uint32   = 11;
+    repeated sint32         repeated_sint32   = 12;
+    repeated int64          repeated_int64    = 13;
+    repeated uint64         repeated_uint64   = 14;
+    repeated sint64         repeated_sint64   = 15;
+    repeated fixed32        repeated_fixed32  = 16;
+    repeated sfixed32       repeated_sfixed32 = 17;
+    repeated fixed64        repeated_fixed64  = 18;
+    repeated sfixed64       repeated_sfixed64 = 19;
+    repeated bool           repeated_bool     = 20;
+    repeated float          repeated_float    = 21;
+    repeated double         repeated_double   = 22;
+    repeated AnEnum         repeated_enum     = 23;
+    repeated string         repeated_string   = 24;
+    repeated bytes          repeated_bytes    = 25;
+    repeated AnotherMessage repeated_message  = 26;
+    repeated group          RepeatedGroup     = 27 {
+      optional int32 a = 1;
+    }
+  }
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto

@@ -0,0 +1,34 @@
+syntax = "proto2";
+
+option java_multiple_files = true;
+option java_package = "com.google.protobuf.nano";
+
+import "google/protobuf/nano/unittest_extension_nano.proto";
+
+// Must be compiled separately due to extension number reuse.
+// The reuse is deliberate, for testing wire compatibility.
+
+message SingularExtensions {
+  extend ExtendableMessage {
+    optional int32          some_int32    = 10;
+    optional uint32         some_uint32   = 11;
+    optional sint32         some_sint32   = 12;
+    optional int64          some_int64    = 13;
+    optional uint64         some_uint64   = 14;
+    optional sint64         some_sint64   = 15;
+    optional fixed32        some_fixed32  = 16;
+    optional sfixed32       some_sfixed32 = 17;
+    optional fixed64        some_fixed64  = 18;
+    optional sfixed64       some_sfixed64 = 19;
+    optional bool           some_bool     = 20;
+    optional float          some_float    = 21;
+    optional double         some_double   = 22;
+    optional AnEnum         some_enum     = 23;
+    optional string         some_string   = 24;
+    optional bytes          some_bytes    = 25;
+    optional AnotherMessage some_message  = 26;
+    optional group          SomeGroup     = 27 {
+      optional int32 a = 1;
+    }
+  }
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_has_nano.proto

@@ -0,0 +1,82 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: ulas@google.com (Ulas Kirazci)
+
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "NanoHasOuterClass";
+
+message TestAllTypesNanoHas {
+
+  message NestedMessage {
+    optional int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  // Singular
+  optional int32  optional_int32    =  1;
+  optional float  optional_float    = 11;
+  optional double optional_double   = 12;
+  optional string optional_string   = 14;
+  optional bytes  optional_bytes    = 15;
+
+  optional NestedMessage optional_nested_message = 18;
+
+  optional NestedEnum optional_nested_enum = 21;
+
+  // Repeated
+  repeated int32  repeated_int32    = 31;
+  repeated string repeated_string   = 44;
+  repeated bytes  repeated_bytes    = 45;
+
+  repeated NestedMessage repeated_nested_message  = 48;
+
+  repeated NestedEnum repeated_nested_enum  = 51;
+
+  // Singular with defaults
+  optional int32  default_int32    = 61 [default =  41    ];
+  optional string default_string   = 74 [default = "hello"];
+  optional bytes  default_bytes    = 75 [default = "world"];
+
+  optional float default_float_nan = 99  [default =  nan];
+
+  optional NestedEnum default_nested_enum = 81 [default = BAR];
+
+  required int32 id = 86;
+  required NestedEnum required_enum = 87;
+
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto

@@ -0,0 +1,48 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//
+// This is like unittest_import.proto but with optimize_for = NANO_RUNTIME.
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano.testimport";
+option java_outer_classname = "UnittestImportNano";
+
+message ImportMessageNano {
+  optional int32 d = 1;
+}
+
+enum ImportEnumNano {
+  IMPORT_NANO_FOO = 7;
+  IMPORT_NANO_BAR = 8;
+  IMPORT_NANO_BAZ = 9;
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto

@@ -0,0 +1,41 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "MultipleNameClashNano";
+option java_multiple_files = true;
+
+message MultipleNameClashNano {
+  optional int32 field = 1;
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto

@@ -0,0 +1,63 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest_import;
+
+import "google/protobuf/nano/unittest_import_nano.proto";
+
+option java_package = "com.google.protobuf.nano";
+option java_multiple_files = true;
+
+enum FileScopeEnum {
+  ONE = 1;
+  TWO = 2;
+}
+
+message FileScopeEnumRefNano {
+  optional FileScopeEnum enum_field = 1;
+}
+
+message MessageScopeEnumRefNano {
+  enum MessageScopeEnum {
+    ONE = 1;
+    TWO = 2;
+  }
+  optional MessageScopeEnum enum_field = 1;
+}
+
+message MultipleImportingNonMultipleNano1 {
+  optional ImportMessageNano field = 1;
+}
+
+message MultipleImportingNonMultipleNano2 {
+  optional MultipleImportingNonMultipleNano1 nano1 = 1;
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_nano.proto

@@ -0,0 +1,186 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: wink@google.com (Wink Saville)
+
+package protobuf_unittest;
+
+import "google/protobuf/nano/unittest_import_nano.proto";
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "NanoOuterClass";
+
+// Same as TestAllTypes but with the nano runtime.
+message TestAllTypesNano {
+
+  message NestedMessage {
+    optional int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  // Singular
+  optional    int32 optional_int32    =  1;
+  optional    int64 optional_int64    =  2;
+  optional   uint32 optional_uint32   =  3;
+  optional   uint64 optional_uint64   =  4;
+  optional   sint32 optional_sint32   =  5;
+  optional   sint64 optional_sint64   =  6;
+  optional  fixed32 optional_fixed32  =  7;
+  optional  fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional    float optional_float    = 11;
+  optional   double optional_double   = 12;
+  optional     bool optional_bool     = 13;
+  optional   string optional_string   = 14;
+  optional    bytes optional_bytes    = 15;
+
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+
+  optional NestedMessage      optional_nested_message  = 18;
+  optional ForeignMessageNano optional_foreign_message = 19;
+  optional protobuf_unittest_import.ImportMessageNano
+    optional_import_message = 20;
+
+  optional NestedEnum      optional_nested_enum     = 21;
+  optional ForeignEnumNano optional_foreign_enum    = 22;
+  optional protobuf_unittest_import.ImportEnumNano optional_import_enum = 23;
+
+  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
+  optional string optional_cord = 25 [ctype=CORD];
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated group RepeatedGroup = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated NestedMessage      repeated_nested_message  = 48;
+  repeated ForeignMessageNano repeated_foreign_message = 49;
+  repeated protobuf_unittest_import.ImportMessageNano
+    repeated_import_message = 50;
+
+  repeated NestedEnum      repeated_nested_enum  = 51;
+  repeated ForeignEnumNano repeated_foreign_enum = 52;
+  repeated protobuf_unittest_import.ImportEnumNano repeated_import_enum = 53;
+
+  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord = 55 [ctype=CORD];
+
+  // Repeated packed
+  repeated    int32 repeated_packed_int32    = 87 [packed=true];
+  repeated sfixed64 repeated_packed_sfixed64 = 88 [packed=true];
+
+  repeated NestedEnum repeated_packed_nested_enum  = 89 [packed=true];
+
+  // Singular with defaults
+  optional    int32 default_int32    = 61 [default =  41    ];
+  optional    int64 default_int64    = 62 [default =  42    ];
+  optional   uint32 default_uint32   = 63 [default =  43    ];
+  optional   uint64 default_uint64   = 64 [default =  44    ];
+  optional   sint32 default_sint32   = 65 [default = -45    ];
+  optional   sint64 default_sint64   = 66 [default =  46    ];
+  optional  fixed32 default_fixed32  = 67 [default =  47    ];
+  optional  fixed64 default_fixed64  = 68 [default =  48    ];
+  optional sfixed32 default_sfixed32 = 69 [default =  49    ];
+  optional sfixed64 default_sfixed64 = 70 [default = -50    ];
+  optional    float default_float    = 71 [default =  51.5  ];
+  optional   double default_double   = 72 [default =  52e3  ];
+  optional     bool default_bool     = 73 [default = true   ];
+  optional   string default_string   = 74 [default = "hello"];
+  optional    bytes default_bytes    = 75 [default = "world"];
+
+  optional string default_string_nonascii = 76 [default = "dünya"];
+  optional  bytes default_bytes_nonascii  = 77 [default = "dünyab"];
+
+  optional  float default_float_inf      = 97  [default =  inf];
+  optional  float default_float_neg_inf  = 98  [default = -inf];
+  optional  float default_float_nan      = 99  [default =  nan];
+  optional double default_double_inf     = 100 [default =  inf];
+  optional double default_double_neg_inf = 101 [default = -inf];
+  optional double default_double_nan     = 102 [default =  nan];
+
+  optional NestedEnum default_nested_enum = 81 [default = BAR];
+  optional ForeignEnumNano default_foreign_enum = 82
+      [default = FOREIGN_NANO_BAR];
+  optional protobuf_unittest_import.ImportEnumNano
+      default_import_enum = 83 [default = IMPORT_NANO_BAR];
+
+  optional string default_string_piece = 84 [ctype=STRING_PIECE,default="abc"];
+  optional string default_cord = 85 [ctype=CORD,default="123"];
+
+  required int32 id = 86;
+
+  // Try to cause conflicts.
+  optional int32 tag = 93;
+  optional int32 get_serialized_size = 94;
+  optional int32 write_to = 95;
+
+  // Try to fail with java reserved keywords
+  optional int32 synchronized = 96;
+}
+
+message ForeignMessageNano {
+  optional int32 c = 1;
+}
+
+enum ForeignEnumNano {
+  FOREIGN_NANO_FOO = 4;
+  FOREIGN_NANO_BAR = 5;
+  FOREIGN_NANO_BAZ = 6;
+}
+
+// Test that deprecated fields work.  We only verify that they compile (at one
+// point this failed).
+message TestDeprecatedNano {
+  optional int32 deprecated_field = 1 [deprecated = true];
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto

@@ -0,0 +1,49 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: wink@google.com (Wink Saville)
+//
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano";
+// Explicit outer classname to suppress legacy info.
+option java_outer_classname = "UnittestRecursiveNano";
+
+message RecursiveMessageNano {
+  message NestedMessage {
+    optional RecursiveMessageNano a = 1;
+  }
+
+  required int32 id = 1;
+  optional NestedMessage nested_message = 2;
+  optional RecursiveMessageNano optional_recursive_message_nano = 3;
+  repeated RecursiveMessageNano repeated_recursive_message_nano = 4;
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto

@@ -0,0 +1,116 @@
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "NanoReferenceTypes";
+
+message TestAllTypesNano {
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  message NestedMessage {
+    optional int32 foo = 1;
+  }
+
+  // Singular
+  optional    int32 optional_int32    =  1;
+  optional    int64 optional_int64    =  2;
+  optional   uint32 optional_uint32   =  3;
+  optional   uint64 optional_uint64   =  4;
+  optional   sint32 optional_sint32   =  5;
+  optional   sint64 optional_sint64   =  6;
+  optional  fixed32 optional_fixed32  =  7;
+  optional  fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional    float optional_float    = 11;
+  optional   double optional_double   = 12;
+  optional     bool optional_bool     = 13;
+  optional   string optional_string   = 14;
+  optional    bytes optional_bytes    = 15;
+
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+
+  optional NestedMessage      optional_nested_message  = 18;
+
+  optional NestedEnum      optional_nested_enum     = 21;
+
+  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
+  optional string optional_cord = 25 [ctype=CORD];
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated group RepeatedGroup = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated NestedMessage      repeated_nested_message  = 48;
+
+  repeated NestedEnum      repeated_nested_enum  = 51;
+
+  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord = 55 [ctype=CORD];
+
+  // Repeated packed
+  repeated    int32 repeated_packed_int32    = 87 [packed=true];
+  repeated sfixed64 repeated_packed_sfixed64 = 88 [packed=true];
+
+  repeated NestedEnum repeated_packed_nested_enum  = 89 [packed=true];
+
+  // Singular with defaults
+  optional    int32 default_int32    = 61 [default =  41    ];
+  optional    int64 default_int64    = 62 [default =  42    ];
+  optional   uint32 default_uint32   = 63 [default =  43    ];
+  optional   uint64 default_uint64   = 64 [default =  44    ];
+  optional   sint32 default_sint32   = 65 [default = -45    ];
+  optional   sint64 default_sint64   = 66 [default =  46    ];
+  optional  fixed32 default_fixed32  = 67 [default =  47    ];
+  optional  fixed64 default_fixed64  = 68 [default =  48    ];
+  optional sfixed32 default_sfixed32 = 69 [default =  49    ];
+  optional sfixed64 default_sfixed64 = 70 [default = -50    ];
+  optional    float default_float    = 71 [default =  51.5  ];
+  optional   double default_double   = 72 [default =  52e3  ];
+  optional     bool default_bool     = 73 [default = true   ];
+  optional   string default_string   = 74 [default = "hello"];
+  optional    bytes default_bytes    = 75 [default = "world"];
+
+
+  optional  float default_float_inf      = 97  [default =  inf];
+  optional  float default_float_neg_inf  = 98  [default = -inf];
+  optional  float default_float_nan      = 99  [default =  nan];
+  optional double default_double_inf     = 100 [default =  inf];
+  optional double default_double_neg_inf = 101 [default = -inf];
+  optional double default_double_nan     = 102 [default =  nan];
+
+}
+
+message ForeignMessageNano {
+  optional int32 c = 1;
+}
+
+enum ForeignEnumNano {
+  FOREIGN_NANO_FOO = 4;
+  FOREIGN_NANO_BAR = 5;
+  FOREIGN_NANO_BAZ = 6;
+}
+

javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto

@@ -0,0 +1,47 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest;
+
+import "google/protobuf/nano/unittest_nano.proto";
+
+option java_package = "com.google.protobuf.nano";
+option java_multiple_files = true;
+
+// A container message for testing the merging of repeated fields at a
+// nested level. Other tests will be done using the repeated fields in
+// TestAllTypesNano.
+message TestRepeatedMergeNano {
+
+  optional TestAllTypesNano contained = 1;
+
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto

@@ -0,0 +1,95 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf.nano";
+option java_outer_classname = "NanoRepeatedPackables";
+
+enum Enum {
+  OPTION_ONE = 1;
+  OPTION_TWO = 2;
+}
+
+// Two almost identical messages with all packable repeated field types.
+// One with none marked as packed and the other all packed. For
+// compatibility, they should be able to parse each other's serialized
+// forms.
+
+message NonPacked {
+
+  // All packable types, none marked as packed.
+
+  repeated    int32 int32s    = 1;
+  repeated    int64 int64s    = 2;
+  repeated   uint32 uint32s   = 3;
+  repeated   uint64 uint64s   = 4;
+  repeated   sint32 sint32s   = 5;
+  repeated   sint64 sint64s   = 6;
+  repeated  fixed32 fixed32s  = 7;
+  repeated  fixed64 fixed64s  = 8;
+  repeated sfixed32 sfixed32s = 9;
+  repeated sfixed64 sfixed64s = 10;
+  repeated    float floats    = 11;
+  repeated   double doubles   = 12;
+  repeated     bool bools     = 13;
+  repeated     Enum enums     = 14;
+
+  // Noise for testing merged deserialization.
+  optional int32 noise = 15;
+
+}
+
+message Packed {
+
+  // All packable types, all matching the field numbers in NonPacked,
+  // all marked as packed.
+
+  repeated    int32 int32s    = 1  [ packed = true ];
+  repeated    int64 int64s    = 2  [ packed = true ];
+  repeated   uint32 uint32s   = 3  [ packed = true ];
+  repeated   uint64 uint64s   = 4  [ packed = true ];
+  repeated   sint32 sint32s   = 5  [ packed = true ];
+  repeated   sint64 sint64s   = 6  [ packed = true ];
+  repeated  fixed32 fixed32s  = 7  [ packed = true ];
+  repeated  fixed64 fixed64s  = 8  [ packed = true ];
+  repeated sfixed32 sfixed32s = 9  [ packed = true ];
+  repeated sfixed64 sfixed64s = 10 [ packed = true ];
+  repeated    float floats    = 11 [ packed = true ];
+  repeated   double doubles   = 12 [ packed = true ];
+  repeated     bool bools     = 13 [ packed = true ];
+  repeated     Enum enums     = 14 [ packed = true ];
+
+  // Noise for testing merged deserialization.
+  optional int32 noise = 15;
+
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto

@@ -0,0 +1,54 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: wink@google.com (Wink Saville)
+//
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano";
+// Explicit outer classname to suppress legacy info.
+option java_outer_classname = "UnittestSimpleNano";
+
+message SimpleMessageNano {
+  message NestedMessage {
+    optional int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+  }
+
+  optional int32 d = 1 [default = 123];
+  optional NestedMessage nested_msg = 2;
+  optional NestedEnum default_nested_enum = 3 [default = BAZ];
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_single_nano.proto

@@ -0,0 +1,38 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: maxtroy@google.com (Max Cai)
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano";
+
+message SingleMessageNano {
+}

javanano/src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto

@@ -0,0 +1,43 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: wink@google.com (Wink Saville)
+//
+
+package protobuf_unittest_import;
+
+option java_package = "com.google.protobuf.nano";
+// Explicit outer classname to suppress legacy info.
+option java_outer_classname = "UnittestStringutf8Nano";
+
+message StringUtf8 {
+  optional string id = 1;
+  repeated string rs = 2;
+}

src/google/protobuf/compiler/javanano/javanano_enum.cc

@@ -0,0 +1,111 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <map>
+#include <string>
+
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/compiler/javanano/javanano_enum.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+EnumGenerator::EnumGenerator(const EnumDescriptor* descriptor, const Params& params)
+  : params_(params), descriptor_(descriptor) {
+  for (int i = 0; i < descriptor_->value_count(); i++) {
+    const EnumValueDescriptor* value = descriptor_->value(i);
+    const EnumValueDescriptor* canonical_value =
+      descriptor_->FindValueByNumber(value->number());
+
+    if (value == canonical_value) {
+      canonical_values_.push_back(value);
+    } else {
+      Alias alias;
+      alias.value = value;
+      alias.canonical_value = canonical_value;
+      aliases_.push_back(alias);
+    }
+  }
+}
+
+EnumGenerator::~EnumGenerator() {}
+
+void EnumGenerator::Generate(io::Printer* printer) {
+  printer->Print(
+      "\n"
+      "// enum $classname$\n",
+      "classname", descriptor_->name());
+
+  // Start of container interface
+  bool use_shell_class = params_.java_enum_style();
+  if (use_shell_class) {
+    printer->Print(
+      "public interface $classname$ {\n",
+      "classname", RenameJavaKeywords(descriptor_->name()));
+    printer->Indent();
+  }
+
+  // Canonical values
+  for (int i = 0; i < canonical_values_.size(); i++) {
+    printer->Print(
+      "public static final int $name$ = $canonical_value$;\n",
+      "name", RenameJavaKeywords(canonical_values_[i]->name()),
+      "canonical_value", SimpleItoa(canonical_values_[i]->number()));
+  }
+
+  // Aliases
+  for (int i = 0; i < aliases_.size(); i++) {
+    printer->Print(
+      "public static final int $name$ = $canonical_name$;\n",
+      "name", RenameJavaKeywords(aliases_[i].value->name()),
+      "canonical_name", RenameJavaKeywords(aliases_[i].canonical_value->name()));
+  }
+
+  // End of container interface
+  if (use_shell_class) {
+    printer->Outdent();
+    printer->Print("}\n");
+  }
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_enum.h

@@ -0,0 +1,87 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__
+
+#include <string>
+#include <vector>
+
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class Printer;             // printer.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class EnumGenerator {
+ public:
+  explicit EnumGenerator(const EnumDescriptor* descriptor, const Params& params);
+  ~EnumGenerator();
+
+  void Generate(io::Printer* printer);
+
+ private:
+  const Params& params_;
+  const EnumDescriptor* descriptor_;
+
+  // The proto language allows multiple enum constants to have the same numeric
+  // value.  Java, however, does not allow multiple enum constants to be
+  // considered equivalent.  We treat the first defined constant for any
+  // given numeric value as "canonical" and the rest as aliases of that
+  // canonical value.
+  vector<const EnumValueDescriptor*> canonical_values_;
+
+  struct Alias {
+    const EnumValueDescriptor* value;
+    const EnumValueDescriptor* canonical_value;
+  };
+  vector<Alias> aliases_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__

src/google/protobuf/compiler/javanano/javanano_enum_field.cc

@@ -0,0 +1,520 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <map>
+#include <string>
+
+#include <google/protobuf/compiler/javanano/javanano_enum_field.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+namespace {
+
+// TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
+//   repeat code between this and the other field types.
+void SetEnumVariables(const Params& params,
+    const FieldDescriptor* descriptor, map<string, string>* variables) {
+  (*variables)["name"] =
+    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
+  (*variables)["capitalized_name"] =
+    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
+  (*variables)["number"] = SimpleItoa(descriptor->number());
+  if (params.use_reference_types_for_primitives()
+      && !params.reftypes_primitive_enums()
+      && !descriptor->is_repeated()) {
+    (*variables)["type"] = "java.lang.Integer";
+    (*variables)["default"] = "null";
+  } else {
+    (*variables)["type"] = "int";
+    (*variables)["default"] = DefaultValue(params, descriptor);
+  }
+  (*variables)["repeated_default"] =
+      "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
+  (*variables)["tag"] = SimpleItoa(internal::WireFormat::MakeTag(descriptor));
+  (*variables)["tag_size"] = SimpleItoa(
+      internal::WireFormat::TagSize(descriptor->number(), descriptor->type()));
+  (*variables)["non_packed_tag"] = SimpleItoa(
+      internal::WireFormatLite::MakeTag(descriptor->number(),
+          internal::WireFormat::WireTypeForFieldType(descriptor->type())));
+  (*variables)["message_name"] = descriptor->containing_type()->name();
+}
+
+void LoadEnumValues(const Params& params,
+    const EnumDescriptor* enum_descriptor, vector<string>* canonical_values) {
+  string enum_class_name = ClassName(params, enum_descriptor);
+  for (int i = 0; i < enum_descriptor->value_count(); i++) {
+    const EnumValueDescriptor* value = enum_descriptor->value(i);
+    const EnumValueDescriptor* canonical_value =
+        enum_descriptor->FindValueByNumber(value->number());
+    if (value == canonical_value) {
+      canonical_values->push_back(
+          enum_class_name + "." + RenameJavaKeywords(value->name()));
+    }
+  }
+}
+
+void PrintCaseLabels(
+    io::Printer* printer, const vector<string>& canonical_values) {
+  for (int i = 0; i < canonical_values.size(); i++) {
+    printer->Print(
+      "  case $value$:\n",
+      "value", canonical_values[i]);
+  }
+}
+
+}  // namespace
+
+// ===================================================================
+
+EnumFieldGenerator::
+EnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetEnumVariables(params, descriptor, &variables_);
+  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
+}
+
+EnumFieldGenerator::~EnumFieldGenerator() {}
+
+void EnumFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
+  printer->Print(variables_,
+    "public $type$ $name$;\n");
+
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "public boolean has$capitalized_name$;\n");
+  }
+}
+
+void EnumFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = $default$;\n");
+
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "has$capitalized_name$ = false;\n");
+  }
+}
+
+void EnumFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "int value = input.readInt32();\n"
+    "switch (value) {\n");
+  PrintCaseLabels(printer, canonical_values_);
+  printer->Print(variables_,
+    "    this.$name$ = value;\n");
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "    has$capitalized_name$ = true;\n");
+  }
+  printer->Print(
+    "    break;\n"
+    "}\n");
+  // No default case: in case of invalid value from the wire, preserve old
+  // field value. Also we are not storing the invalid value into the unknown
+  // fields, because there is no way to get the value out.
+}
+
+void EnumFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  if (descriptor_->is_required() && !params_.generate_has()) {
+    // Always serialize a required field if we don't have the 'has' signal.
+    printer->Print(variables_,
+      "output.writeInt32($number$, this.$name$);\n");
+  } else {
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
+    } else {
+      printer->Print(variables_,
+        "if (this.$name$ != $default$) {\n");
+    }
+    printer->Print(variables_,
+      "  output.writeInt32($number$, this.$name$);\n"
+      "}\n");
+  }
+}
+
+void EnumFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  if (descriptor_->is_required() && !params_.generate_has()) {
+    printer->Print(variables_,
+      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "  .computeInt32Size($number$, this.$name$);\n");
+  } else {
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
+    } else {
+      printer->Print(variables_,
+        "if (this.$name$ != $default$) {\n");
+    }
+    printer->Print(variables_,
+      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "    .computeInt32Size($number$, this.$name$);\n"
+      "}\n");
+  }
+}
+
+void EnumFieldGenerator::GenerateEqualsCode(io::Printer* printer) const {
+  if (params_.use_reference_types_for_primitives()
+        && !params_.reftypes_primitive_enums()) {
+    printer->Print(variables_,
+      "if (this.$name$ == null) {\n"
+      "  if (other.$name$ != null) {\n"
+      "    return false;\n"
+      "  }\n"
+      "} else if (!this.$name$.equals(other.$name$)) {\n"
+      "  return false;"
+      "}\n");
+  } else {
+    // We define equality as serialized form equality. If generate_has(),
+    // then if the field value equals the default value in both messages,
+    // but one's 'has' field is set and the other's is not, the serialized
+    // forms are different and we should return false.
+    printer->Print(variables_,
+      "if (this.$name$ != other.$name$");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "    || (this.$name$ == $default$\n"
+        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "  return false;\n"
+      "}\n");
+  }
+}
+
+void EnumFieldGenerator::GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(
+    "result = 31 * result + ");
+  if (params_.use_reference_types_for_primitives()
+        && !params_.reftypes_primitive_enums()) {
+    printer->Print(variables_,
+      "(this.$name$ == null ? 0 : this.$name$)");
+  } else {
+    printer->Print(variables_,
+      "this.$name$");
+  }
+  printer->Print(";\n");
+}
+
+// ===================================================================
+
+AccessorEnumFieldGenerator::
+AccessorEnumFieldGenerator(const FieldDescriptor* descriptor,
+    const Params& params, int has_bit_index)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetEnumVariables(params, descriptor, &variables_);
+  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
+  SetBitOperationVariables("has", has_bit_index, &variables_);
+}
+
+AccessorEnumFieldGenerator::~AccessorEnumFieldGenerator() {}
+
+void AccessorEnumFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
+  printer->Print(variables_,
+    "private int $name$_;\n"
+    "public int get$capitalized_name$() {\n"
+    "  return $name$_;\n"
+    "}\n"
+    "public $message_name$ set$capitalized_name$(int value) {\n"
+    "  $name$_ = value;\n"
+    "  $set_has$;\n"
+    "  return this;\n"
+    "}\n"
+    "public boolean has$capitalized_name$() {\n"
+    "  return $get_has$;\n"
+    "}\n"
+    "public $message_name$ clear$capitalized_name$() {\n"
+    "  $name$_ = $default$;\n"
+    "  $clear_has$;\n"
+    "  return this;\n"
+    "}\n");
+}
+
+void AccessorEnumFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$_ = $default$;\n");
+}
+
+void AccessorEnumFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "int value = input.readInt32();\n"
+    "switch (value) {\n");
+  PrintCaseLabels(printer, canonical_values_);
+  printer->Print(variables_,
+    "    $name$_ = value;\n"
+    "    $set_has$;\n"
+    "    break;\n"
+    "}\n");
+  // No default case: in case of invalid value from the wire, preserve old
+  // field value. Also we are not storing the invalid value into the unknown
+  // fields, because there is no way to get the value out.
+}
+
+void AccessorEnumFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if ($get_has$) {\n"
+    "  output.writeInt32($number$, $name$_);\n"
+    "}\n");
+}
+
+void AccessorEnumFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if ($get_has$) {\n"
+    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+    "    .computeInt32Size($number$, $name$_);\n"
+    "}\n");
+}
+
+void AccessorEnumFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if ($different_has$\n"
+    "    || $name$_ != other.$name$_) {\n"
+    "  return false;\n"
+    "}\n");
+}
+
+void AccessorEnumFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "result = 31 * result + $name$_;\n");
+}
+
+// ===================================================================
+
+RepeatedEnumFieldGenerator::
+RepeatedEnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetEnumVariables(params, descriptor, &variables_);
+  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
+}
+
+RepeatedEnumFieldGenerator::~RepeatedEnumFieldGenerator() {}
+
+void RepeatedEnumFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
+  printer->Print(variables_,
+    "public $type$[] $name$;\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = $repeated_default$;\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  // First, figure out the maximum length of the array, then parse,
+  // and finally copy the valid values to the field.
+  printer->Print(variables_,
+    "int length = com.google.protobuf.nano.WireFormatNano\n"
+    "    .getRepeatedFieldArrayLength(input, $non_packed_tag$);\n"
+    "int[] validValues = new int[length];\n"
+    "int validCount = 0;\n"
+    "for (int i = 0; i < length; i++) {\n"
+    "  if (i != 0) { // tag for first value already consumed.\n"
+    "    input.readTag();\n"
+    "  }\n"
+    "  int value = input.readInt32();\n"
+    "  switch (value) {\n");
+  printer->Indent();
+  PrintCaseLabels(printer, canonical_values_);
+  printer->Outdent();
+  printer->Print(variables_,
+    "      validValues[validCount++] = value;\n"
+    "      break;\n"
+    "  }\n"
+    "}\n"
+    "if (validCount != 0) {\n"
+    "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
+    "  if (i == 0 && validCount == validValues.length) {\n"
+    "    this.$name$ = validValues;\n"
+    "  } else {\n"
+    "    int[] newArray = new int[i + validCount];\n"
+    "    if (i != 0) {\n"
+    "      java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
+    "    }\n"
+    "    java.lang.System.arraycopy(validValues, 0, newArray, i, validCount);\n"
+    "    this.$name$ = newArray;\n"
+    "  }\n"
+    "}\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateMergingCodeFromPacked(io::Printer* printer) const {
+  printer->Print(variables_,
+    "int bytes = input.readRawVarint32();\n"
+    "int limit = input.pushLimit(bytes);\n"
+    "// First pass to compute array length.\n"
+    "int arrayLength = 0;\n"
+    "int startPos = input.getPosition();\n"
+    "while (input.getBytesUntilLimit() > 0) {\n"
+    "  switch (input.readInt32()) {\n");
+  printer->Indent();
+  PrintCaseLabels(printer, canonical_values_);
+  printer->Outdent();
+  printer->Print(variables_,
+    "      arrayLength++;\n"
+    "      break;\n"
+    "  }\n"
+    "}\n"
+    "if (arrayLength != 0) {\n"
+    "  input.rewindToPosition(startPos);\n"
+    "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
+    "  int[] newArray = new int[i + arrayLength];\n"
+    "  if (i != 0) {\n"
+    "    java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
+    "  }\n"
+    "  while (input.getBytesUntilLimit() > 0) {\n"
+    "    int value = input.readInt32();\n"
+    "    switch (value) {\n");
+  printer->Indent();
+  printer->Indent();
+  PrintCaseLabels(printer, canonical_values_);
+  printer->Outdent();
+  printer->Outdent();
+  printer->Print(variables_,
+    "        newArray[i++] = value;\n"
+    "        break;\n"
+    "    }\n"
+    "  }\n"
+    "  this.$name$ = newArray;\n"
+    "}\n"
+    "input.popLimit(limit);\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateRepeatedDataSizeCode(io::Printer* printer) const {
+  // Creates a variable dataSize and puts the serialized size in there.
+  printer->Print(variables_,
+    "int dataSize = 0;\n"
+    "for (int i = 0; i < this.$name$.length; i++) {\n"
+    "  int element = this.$name$[i];\n"
+    "  dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+    "      .computeInt32SizeNoTag(element);\n"
+    "}\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n");
+  printer->Indent();
+
+  if (descriptor_->options().packed()) {
+    GenerateRepeatedDataSizeCode(printer);
+    printer->Print(variables_,
+      "output.writeRawVarint32($tag$);\n"
+      "output.writeRawVarint32(dataSize);\n"
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  output.writeRawVarint32(this.$name$[i]);\n"
+      "}\n");
+  } else {
+    printer->Print(variables_,
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  output.writeInt32($number$, this.$name$[i]);\n"
+      "}\n");
+  }
+
+  printer->Outdent();
+  printer->Print(variables_,
+    "}\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n");
+  printer->Indent();
+
+  GenerateRepeatedDataSizeCode(printer);
+
+  printer->Print(
+    "size += dataSize;\n");
+  if (descriptor_->options().packed()) {
+    printer->Print(variables_,
+      "size += $tag_size$;\n"
+      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "    .computeRawVarint32Size(dataSize);\n");
+  } else {
+    printer->Print(variables_,
+      "size += $tag_size$ * this.$name$.length;\n");
+  }
+
+  printer->Outdent();
+
+  printer->Print(
+    "}\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
+    "    this.$name$, other.$name$)) {\n"
+    "  return false;\n"
+    "}\n");
+}
+
+void RepeatedEnumFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "result = 31 * result\n"
+    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_enum_field.h

@@ -0,0 +1,125 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__
+
+#include <map>
+#include <string>
+#include <vector>
+#include <google/protobuf/compiler/javanano/javanano_field.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class EnumFieldGenerator : public FieldGenerator {
+ public:
+  explicit EnumFieldGenerator(
+      const FieldDescriptor* descriptor, const Params& params);
+  ~EnumFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+  vector<string> canonical_values_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumFieldGenerator);
+};
+
+class AccessorEnumFieldGenerator : public FieldGenerator {
+ public:
+  explicit AccessorEnumFieldGenerator(const FieldDescriptor* descriptor,
+      const Params& params, int has_bit_index);
+  ~AccessorEnumFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+  vector<string> canonical_values_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(AccessorEnumFieldGenerator);
+};
+
+class RepeatedEnumFieldGenerator : public FieldGenerator {
+ public:
+  explicit RepeatedEnumFieldGenerator(
+      const FieldDescriptor* descriptor, const Params& params);
+  ~RepeatedEnumFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateMergingCodeFromPacked(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  void GenerateRepeatedDataSizeCode(io::Printer* printer) const;
+
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+  vector<string> canonical_values_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedEnumFieldGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__

src/google/protobuf/compiler/javanano/javanano_extension.cc

@@ -0,0 +1,150 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: bduff@google.com (Brian Duff)
+
+#include <google/protobuf/compiler/javanano/javanano_extension.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/wire_format.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+using internal::WireFormat;
+using internal::WireFormatLite;
+
+namespace {
+
+const char* GetTypeConstantName(const FieldDescriptor::Type type) {
+  switch (type) {
+    case FieldDescriptor::TYPE_INT32   : return "TYPE_INT32"   ;
+    case FieldDescriptor::TYPE_UINT32  : return "TYPE_UINT32"  ;
+    case FieldDescriptor::TYPE_SINT32  : return "TYPE_SINT32"  ;
+    case FieldDescriptor::TYPE_FIXED32 : return "TYPE_FIXED32" ;
+    case FieldDescriptor::TYPE_SFIXED32: return "TYPE_SFIXED32";
+    case FieldDescriptor::TYPE_INT64   : return "TYPE_INT64"   ;
+    case FieldDescriptor::TYPE_UINT64  : return "TYPE_UINT64"  ;
+    case FieldDescriptor::TYPE_SINT64  : return "TYPE_SINT64"  ;
+    case FieldDescriptor::TYPE_FIXED64 : return "TYPE_FIXED64" ;
+    case FieldDescriptor::TYPE_SFIXED64: return "TYPE_SFIXED64";
+    case FieldDescriptor::TYPE_FLOAT   : return "TYPE_FLOAT"   ;
+    case FieldDescriptor::TYPE_DOUBLE  : return "TYPE_DOUBLE"  ;
+    case FieldDescriptor::TYPE_BOOL    : return "TYPE_BOOL"    ;
+    case FieldDescriptor::TYPE_STRING  : return "TYPE_STRING"  ;
+    case FieldDescriptor::TYPE_BYTES   : return "TYPE_BYTES"   ;
+    case FieldDescriptor::TYPE_ENUM    : return "TYPE_ENUM"    ;
+    case FieldDescriptor::TYPE_GROUP   : return "TYPE_GROUP"   ;
+    case FieldDescriptor::TYPE_MESSAGE : return "TYPE_MESSAGE" ;
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return NULL;
+}
+
+}  // namespace
+
+void SetVariables(const FieldDescriptor* descriptor, const Params params,
+                  map<string, string>* variables) {
+  (*variables)["extends"] = ClassName(params, descriptor->containing_type());
+  (*variables)["name"] = RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
+  bool repeated = descriptor->is_repeated();
+  (*variables)["repeated"] = repeated ? "Repeated" : "";
+  (*variables)["type"] = GetTypeConstantName(descriptor->type());
+  JavaType java_type = GetJavaType(descriptor->type());
+  string tag = SimpleItoa(WireFormat::MakeTag(descriptor));
+  if (java_type == JAVATYPE_MESSAGE) {
+    (*variables)["ext_type"] = "MessageTyped";
+    string message_type = ClassName(params, descriptor->message_type());
+    if (repeated) {
+      message_type += "[]";
+    }
+    (*variables)["class"] = message_type;
+    // For message typed extensions, tags_params contains a single tag
+    // for both singular and repeated cases.
+    (*variables)["tag_params"] = tag;
+  } else {
+    (*variables)["ext_type"] = "PrimitiveTyped";
+    if (!repeated) {
+      (*variables)["class"] = BoxedPrimitiveTypeName(java_type);
+      (*variables)["tag_params"] = tag;
+    } else {
+      (*variables)["class"] = PrimitiveTypeName(java_type) + "[]";
+      if (!descriptor->is_packable()) {
+        // Non-packable: nonPackedTag == tag, packedTag == 0
+        (*variables)["tag_params"] = tag + ", " + tag + ", 0";
+      } else if (descriptor->options().packed()) {
+        // Packable and packed: tag == packedTag
+        string non_packed_tag = SimpleItoa(WireFormatLite::MakeTag(
+            descriptor->number(),
+            WireFormat::WireTypeForFieldType(descriptor->type())));
+        (*variables)["tag_params"] = tag + ", " + non_packed_tag + ", " + tag;
+      } else {
+        // Packable and not packed: tag == nonPackedTag
+        string packed_tag = SimpleItoa(WireFormatLite::MakeTag(
+            descriptor->number(), WireFormatLite::WIRETYPE_LENGTH_DELIMITED));
+        (*variables)["tag_params"] = tag + ", " + tag + ", " + packed_tag;
+      }
+    }
+  }
+}
+
+ExtensionGenerator::
+ExtensionGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : params_(params), descriptor_(descriptor) {
+  SetVariables(descriptor, params, &variables_);
+}
+
+ExtensionGenerator::~ExtensionGenerator() {}
+
+void ExtensionGenerator::Generate(io::Printer* printer) const {
+  printer->Print("\n");
+  PrintFieldComment(printer, descriptor_);
+  printer->Print(variables_,
+    "public static final com.google.protobuf.nano.Extension<\n"
+    "    $extends$,\n"
+    "    $class$> $name$ =\n"
+    "        com.google.protobuf.nano.Extension.create$repeated$$ext_type$(\n"
+    "            com.google.protobuf.nano.Extension.$type$,\n"
+    "            $class$.class,\n"
+    "            $tag_params$);\n");
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+

src/google/protobuf/compiler/javanano/javanano_extension.h

@@ -0,0 +1,74 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: bduff@google.com (Brian Duff)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/descriptor.pb.h>
+
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class Printer;             // printer.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class ExtensionGenerator {
+ public:
+  explicit ExtensionGenerator(const FieldDescriptor* descriptor, const Params& params);
+  ~ExtensionGenerator();
+
+  void Generate(io::Printer* printer) const;
+
+ private:
+  const Params& params_;
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ExtensionGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_

src/google/protobuf/compiler/javanano/javanano_field.cc

@@ -0,0 +1,143 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <google/protobuf/compiler/javanano/javanano_field.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/compiler/javanano/javanano_primitive_field.h>
+#include <google/protobuf/compiler/javanano/javanano_enum_field.h>
+#include <google/protobuf/compiler/javanano/javanano_message_field.h>
+#include <google/protobuf/stubs/common.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+FieldGenerator::~FieldGenerator() {}
+
+bool FieldGenerator::SavedDefaultNeeded() const {
+  // No saved default for this field by default.
+  // Subclasses whose instances may need saved defaults will override this
+  // and return the appropriate value.
+  return false;
+}
+
+void FieldGenerator::GenerateInitSavedDefaultCode(io::Printer* printer) const {
+  // No saved default for this field by default.
+  // Subclasses whose instances may need saved defaults will override this
+  // and generate the appropriate init code to the printer.
+}
+
+void FieldGenerator::GenerateMergingCodeFromPacked(io::Printer* printer) const {
+  // Reaching here indicates a bug. Cases are:
+  //   - This FieldGenerator should support packing, but this method should be
+  //     overridden.
+  //   - This FieldGenerator doesn't support packing, and this method should
+  //     never have been called.
+  GOOGLE_LOG(FATAL) << "GenerateParsingCodeFromPacked() "
+             << "called on field generator that does not support packing.";
+}
+
+// =============================================
+
+FieldGeneratorMap::FieldGeneratorMap(
+    const Descriptor* descriptor, const Params &params)
+  : descriptor_(descriptor),
+    field_generators_(
+      new scoped_ptr<FieldGenerator>[descriptor->field_count()]) {
+
+  int next_has_bit_index = 0;
+  bool saved_defaults_needed = false;
+  // Construct all the FieldGenerators.
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    FieldGenerator* field_generator = MakeGenerator(
+        descriptor->field(i), params, &next_has_bit_index);
+    saved_defaults_needed = saved_defaults_needed
+        || field_generator->SavedDefaultNeeded();
+    field_generators_[i].reset(field_generator);
+  }
+  total_bits_ = next_has_bit_index;
+  saved_defaults_needed_ = saved_defaults_needed;
+}
+
+FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
+    const Params &params, int* next_has_bit_index) {
+  JavaType java_type = GetJavaType(field);
+  if (field->is_repeated()) {
+    switch (java_type) {
+      case JAVATYPE_MESSAGE:
+        return new RepeatedMessageFieldGenerator(field, params);
+      case JAVATYPE_ENUM:
+        return new RepeatedEnumFieldGenerator(field, params);
+      default:
+        return new RepeatedPrimitiveFieldGenerator(field, params);
+    }
+  } else if (params.optional_field_accessors() && field->is_optional()
+      && java_type != JAVATYPE_MESSAGE) {
+    // We need a has-bit for each primitive/enum field because their default
+    // values could be same as explicitly set values. But we don't need it
+    // for a message field because they have no defaults and Nano uses 'null'
+    // for unset messages, which cannot be set explicitly.
+    switch (java_type) {
+      case JAVATYPE_ENUM:
+        return new AccessorEnumFieldGenerator(
+            field, params, (*next_has_bit_index)++);
+      default:
+        return new AccessorPrimitiveFieldGenerator(
+            field, params, (*next_has_bit_index)++);
+    }
+  } else {
+    switch (java_type) {
+      case JAVATYPE_MESSAGE:
+        return new MessageFieldGenerator(field, params);
+      case JAVATYPE_ENUM:
+        return new EnumFieldGenerator(field, params);
+      default:
+        return new PrimitiveFieldGenerator(field, params);
+    }
+  }
+}
+
+FieldGeneratorMap::~FieldGeneratorMap() {}
+
+const FieldGenerator& FieldGeneratorMap::get(
+    const FieldDescriptor* field) const {
+  GOOGLE_CHECK_EQ(field->containing_type(), descriptor_);
+  return *field_generators_[field->index()];
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_field.h

@@ -0,0 +1,119 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__
+
+#include <string>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class Printer;             // printer.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class FieldGenerator {
+ public:
+  FieldGenerator(const Params& params) : params_(params) {}
+  virtual ~FieldGenerator();
+
+  virtual bool SavedDefaultNeeded() const;
+  virtual void GenerateInitSavedDefaultCode(io::Printer* printer) const;
+
+  // Generates code for Java fields and methods supporting this field.
+  // If this field needs a saved default (SavedDefaultNeeded() is true),
+  // then @lazy_init controls how the static field for that default value
+  // and its initialization code should be generated. If @lazy_init is
+  // true, the static field is not declared final and the initialization
+  // code is generated only when GenerateInitSavedDefaultCode is called;
+  // otherwise, the static field is declared final and initialized inline.
+  // GenerateInitSavedDefaultCode will not be called in the latter case.
+  virtual void GenerateMembers(
+      io::Printer* printer, bool lazy_init) const = 0;
+
+  virtual void GenerateClearCode(io::Printer* printer) const = 0;
+  virtual void GenerateMergingCode(io::Printer* printer) const = 0;
+
+  // Generates code to merge from packed serialized form. The default
+  // implementation will fail; subclasses which can handle packed serialized
+  // forms will override this and print appropriate code to the printer.
+  virtual void GenerateMergingCodeFromPacked(io::Printer* printer) const;
+
+  virtual void GenerateSerializationCode(io::Printer* printer) const = 0;
+  virtual void GenerateSerializedSizeCode(io::Printer* printer) const = 0;
+  virtual void GenerateEqualsCode(io::Printer* printer) const = 0;
+  virtual void GenerateHashCodeCode(io::Printer* printer) const = 0;
+
+ protected:
+  const Params& params_;
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
+};
+
+// Convenience class which constructs FieldGenerators for a Descriptor.
+class FieldGeneratorMap {
+ public:
+  explicit FieldGeneratorMap(const Descriptor* descriptor, const Params &params);
+  ~FieldGeneratorMap();
+
+  const FieldGenerator& get(const FieldDescriptor* field) const;
+  int total_bits() const { return total_bits_; }
+  bool saved_defaults_needed() const { return saved_defaults_needed_; }
+
+ private:
+  const Descriptor* descriptor_;
+  scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
+  int total_bits_;
+  bool saved_defaults_needed_;
+
+  static FieldGenerator* MakeGenerator(const FieldDescriptor* field,
+      const Params &params, int* next_has_bit_index);
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__

src/google/protobuf/compiler/javanano/javanano_file.cc

@@ -0,0 +1,263 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <iostream>
+
+#include <google/protobuf/compiler/javanano/javanano_file.h>
+#include <google/protobuf/compiler/javanano/javanano_enum.h>
+#include <google/protobuf/compiler/javanano/javanano_extension.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/compiler/javanano/javanano_message.h>
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+namespace {
+
+// Recursively searches the given message to see if it contains any extensions.
+bool UsesExtensions(const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+
+  // We conservatively assume that unknown fields are extensions.
+  if (reflection->GetUnknownFields(message).field_count() > 0) return true;
+
+  vector<const FieldDescriptor*> fields;
+  reflection->ListFields(message, &fields);
+
+  for (int i = 0; i < fields.size(); i++) {
+    if (fields[i]->is_extension()) return true;
+
+    if (fields[i]->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+      if (fields[i]->is_repeated()) {
+        int size = reflection->FieldSize(message, fields[i]);
+        for (int j = 0; j < size; j++) {
+          const Message& sub_message =
+            reflection->GetRepeatedMessage(message, fields[i], j);
+          if (UsesExtensions(sub_message)) return true;
+        }
+      } else {
+        const Message& sub_message = reflection->GetMessage(message, fields[i]);
+        if (UsesExtensions(sub_message)) return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+}  // namespace
+
+FileGenerator::FileGenerator(const FileDescriptor* file, const Params& params)
+  : file_(file),
+    params_(params),
+    java_package_(FileJavaPackage(params, file)),
+    classname_(FileClassName(params, file)) {}
+
+FileGenerator::~FileGenerator() {}
+
+bool FileGenerator::Validate(string* error) {
+  // Check for extensions
+  FileDescriptorProto file_proto;
+  file_->CopyTo(&file_proto);
+  if (UsesExtensions(file_proto) && !params_.store_unknown_fields()) {
+    error->assign(file_->name());
+    error->append(
+        ": Java NANO_RUNTIME only supports extensions when the "
+        "'store_unknown_fields' generator option is 'true'.");
+    return false;
+  }
+
+  if (file_->service_count() != 0 && !params_.ignore_services()) {
+    error->assign(file_->name());
+    error->append(
+      ": Java NANO_RUNTIME does not support services\"");
+    return false;
+  }
+
+  if (!IsOuterClassNeeded(params_, file_)) {
+    return true;
+  }
+
+  // Check whether legacy javanano generator would omit the outer class.
+  if (!params_.has_java_outer_classname(file_->name())
+      && file_->message_type_count() == 1
+      && file_->enum_type_count() == 0 && file_->extension_count() == 0) {
+    cout << "INFO: " << file_->name() << ":" << endl;
+    cout << "Javanano generator has changed to align with java generator. "
+        "An outer class will be created for this file and the single message "
+        "in the file will become a nested class. Use java_multiple_files to "
+        "skip generating the outer class, or set an explicit "
+        "java_outer_classname to suppress this message." << endl;
+  }
+
+  // Check that no class name matches the file's class name.  This is a common
+  // problem that leads to Java compile errors that can be hard to understand.
+  // It's especially bad when using the java_multiple_files, since we would
+  // end up overwriting the outer class with one of the inner ones.
+  bool found_conflict = false;
+  for (int i = 0; !found_conflict && i < file_->message_type_count(); i++) {
+    if (file_->message_type(i)->name() == classname_) {
+      found_conflict = true;
+    }
+  }
+  if (params_.java_enum_style()) {
+    for (int i = 0; !found_conflict && i < file_->enum_type_count(); i++) {
+      if (file_->enum_type(i)->name() == classname_) {
+        found_conflict = true;
+      }
+    }
+  }
+  if (found_conflict) {
+    error->assign(file_->name());
+    error->append(
+      ": Cannot generate Java output because the file's outer class name, \"");
+    error->append(classname_);
+    error->append(
+      "\", matches the name of one of the types declared inside it.  "
+      "Please either rename the type or use the java_outer_classname "
+      "option to specify a different outer class name for the .proto file.");
+    return false;
+  }
+  return true;
+}
+
+void FileGenerator::Generate(io::Printer* printer) {
+  // We don't import anything because we refer to all classes by their
+  // fully-qualified names in the generated source.
+  printer->Print(
+    "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n");
+  if (!java_package_.empty()) {
+    printer->Print(
+      "\n"
+      "package $package$;\n",
+      "package", java_package_);
+  }
+
+  // Note: constants (from enums, emitted in the loop below) may have the same names as constants
+  // in the nested classes. This causes Java warnings, but is not fatal, so we suppress those
+  // warnings here in the top-most class declaration.
+  printer->Print(
+    "\n"
+    "@SuppressWarnings(\"hiding\")\n"
+    "public interface $classname$ {\n",
+    "classname", classname_);
+  printer->Indent();
+
+  // -----------------------------------------------------------------
+
+  // Extensions.
+  for (int i = 0; i < file_->extension_count(); i++) {
+    ExtensionGenerator(file_->extension(i), params_).Generate(printer);
+  }
+
+  // Enums.
+  for (int i = 0; i < file_->enum_type_count(); i++) {
+    EnumGenerator(file_->enum_type(i), params_).Generate(printer);
+  }
+
+  // Messages.
+  if (!params_.java_multiple_files(file_->name())) {
+    for (int i = 0; i < file_->message_type_count(); i++) {
+      MessageGenerator(file_->message_type(i), params_).Generate(printer);
+    }
+  }
+
+  // Static variables.
+  for (int i = 0; i < file_->message_type_count(); i++) {
+    // TODO(kenton):  Reuse MessageGenerator objects?
+    MessageGenerator(file_->message_type(i), params_).GenerateStaticVariables(printer);
+  }
+
+  printer->Outdent();
+  printer->Print(
+    "}\n");
+}
+
+template<typename GeneratorClass, typename DescriptorClass>
+static void GenerateSibling(const string& package_dir,
+                            const string& java_package,
+                            const DescriptorClass* descriptor,
+                            GeneratorContext* output_directory,
+                            vector<string>* file_list,
+                            const Params& params) {
+  string filename = package_dir + descriptor->name() + ".java";
+  file_list->push_back(filename);
+
+  scoped_ptr<io::ZeroCopyOutputStream> output(
+    output_directory->Open(filename));
+  io::Printer printer(output.get(), '$');
+
+  printer.Print(
+    "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n");
+  if (!java_package.empty()) {
+    printer.Print(
+      "\n"
+      "package $package$;\n",
+      "package", java_package);
+  }
+
+  GeneratorClass(descriptor, params).Generate(&printer);
+}
+
+void FileGenerator::GenerateSiblings(const string& package_dir,
+                                     GeneratorContext* output_directory,
+                                     vector<string>* file_list) {
+  if (params_.java_multiple_files(file_->name())) {
+    for (int i = 0; i < file_->message_type_count(); i++) {
+      GenerateSibling<MessageGenerator>(package_dir, java_package_,
+                                        file_->message_type(i),
+                                        output_directory, file_list, params_);
+    }
+
+    if (params_.java_enum_style()) {
+      for (int i = 0; i < file_->enum_type_count(); i++) {
+        GenerateSibling<EnumGenerator>(package_dir, java_package_,
+                                       file_->enum_type(i),
+                                       output_directory, file_list, params_);
+      }
+    }
+  }
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_file.h

@@ -0,0 +1,94 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__
+
+#include <string>
+#include <vector>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+
+namespace google {
+namespace protobuf {
+  class FileDescriptor;        // descriptor.h
+  namespace io {
+    class Printer;             // printer.h
+  }
+  namespace compiler {
+    class GeneratorContext;     // code_generator.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class FileGenerator {
+ public:
+  explicit FileGenerator(const FileDescriptor* file, const Params& params);
+  ~FileGenerator();
+
+  // Checks for problems that would otherwise lead to cryptic compile errors.
+  // Returns true if there are no problems, or writes an error description to
+  // the given string and returns false otherwise.
+  bool Validate(string* error);
+
+  void Generate(io::Printer* printer);
+
+  // If we aren't putting everything into one file, this will write all the
+  // files other than the outer file (i.e. one for each message, enum, and
+  // service type).
+  void GenerateSiblings(const string& package_dir,
+                        GeneratorContext* output_directory,
+                        vector<string>* file_list);
+
+  const string& java_package() { return java_package_; }
+  const string& classname()    { return classname_;    }
+
+ private:
+  const FileDescriptor* file_;
+  const Params& params_;
+  string java_package_;
+  string classname_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__

src/google/protobuf/compiler/javanano/javanano_generator.cc

@@ -0,0 +1,219 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/compiler/javanano/javanano_generator.h>
+#include <google/protobuf/compiler/javanano/javanano_file.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+namespace {
+
+string TrimString(const string& s) {
+  string::size_type start = s.find_first_not_of(" \n\r\t");
+  if (start == string::npos) {
+    return "";
+  }
+  string::size_type end = s.find_last_not_of(" \n\r\t") + 1;
+  return s.substr(start, end - start);
+}
+
+} // namespace
+
+void UpdateParamsRecursively(Params& params,
+    const FileDescriptor* file) {
+  // Add any parameters for this file
+  if (file->options().has_java_outer_classname()) {
+    params.set_java_outer_classname(
+      file->name(), file->options().java_outer_classname());
+  }
+  if (file->options().has_java_package()) {
+    params.set_java_package(
+      file->name(), file->options().java_package());
+  }
+  if (file->options().has_java_multiple_files()) {
+    params.set_java_multiple_files(
+      file->name(), file->options().java_multiple_files());
+  }
+
+  // Loop through all dependent files recursively
+  // adding dep
+  for (int i = 0; i < file->dependency_count(); i++) {
+    UpdateParamsRecursively(params, file->dependency(i));
+  }
+}
+
+JavaNanoGenerator::JavaNanoGenerator() {}
+JavaNanoGenerator::~JavaNanoGenerator() {}
+
+bool JavaNanoGenerator::Generate(const FileDescriptor* file,
+                             const string& parameter,
+                             GeneratorContext* output_directory,
+                             string* error) const {
+  vector<pair<string, string> > options;
+
+  ParseGeneratorParameter(parameter, &options);
+
+  // -----------------------------------------------------------------
+  // parse generator options
+
+  // Name a file where we will write a list of generated file names, one
+  // per line.
+  string output_list_file;
+  Params params(file->name());
+
+  // Update per file params
+  UpdateParamsRecursively(params, file);
+
+  // Replace any existing options with ones from command line
+  for (int i = 0; i < options.size(); i++) {
+    string option_name = TrimString(options[i].first);
+    string option_value = TrimString(options[i].second);
+    if (option_name == "output_list_file") {
+      output_list_file = option_value;
+    } else if (option_name == "java_package") {
+        vector<string> parts;
+        SplitStringUsing(option_value, "|", &parts);
+        if (parts.size() != 2) {
+          *error = "Bad java_package, expecting filename|PackageName found '"
+            + option_value + "'";
+          return false;
+        }
+        params.set_java_package(parts[0], parts[1]);
+    } else if (option_name == "java_outer_classname") {
+        vector<string> parts;
+        SplitStringUsing(option_value, "|", &parts);
+        if (parts.size() != 2) {
+          *error = "Bad java_outer_classname, "
+                   "expecting filename|ClassName found '"
+                   + option_value + "'";
+          return false;
+        }
+        params.set_java_outer_classname(parts[0], parts[1]);
+    } else if (option_name == "store_unknown_fields") {
+      params.set_store_unknown_fields(option_value == "true");
+    } else if (option_name == "java_multiple_files") {
+      params.set_override_java_multiple_files(option_value == "true");
+    } else if (option_name == "java_nano_generate_has") {
+      params.set_generate_has(option_value == "true");
+    } else if (option_name == "enum_style") {
+      params.set_java_enum_style(option_value == "java");
+    } else if (option_name == "optional_field_style") {
+      params.set_optional_field_accessors(option_value == "accessors");
+      params.set_use_reference_types_for_primitives(option_value == "reftypes"
+          || option_value == "reftypes_compat_mode");
+      params.set_reftypes_primitive_enums(
+          option_value == "reftypes_compat_mode");
+      if (option_value == "reftypes_compat_mode") {
+        params.set_generate_clear(false);
+      }
+    } else if (option_name == "generate_equals") {
+      params.set_generate_equals(option_value == "true");
+    } else if (option_name == "ignore_services") {
+      params.set_ignore_services(option_value == "true");
+    } else if (option_name == "parcelable_messages") {
+      params.set_parcelable_messages(option_value == "true");
+    } else {
+      *error = "Ignore unknown javanano generator option: " + option_name;
+    }
+  }
+
+  // Check illegal parameter combinations
+  // Note: the enum-like optional_field_style generator param ensures
+  // that we can never have illegal combinations of field styles
+  // (e.g. reftypes and accessors can't be on at the same time).
+  if (params.generate_has()
+      && (params.optional_field_accessors()
+          || params.use_reference_types_for_primitives())) {
+    error->assign("java_nano_generate_has=true cannot be used in conjunction"
+        " with optional_field_style=accessors or optional_field_style=reftypes");
+    return false;
+  }
+
+  // -----------------------------------------------------------------
+
+  FileGenerator file_generator(file, params);
+  if (!file_generator.Validate(error)) {
+    return false;
+  }
+
+  string package_dir =
+    StringReplace(file_generator.java_package(), ".", "/", true);
+  if (!package_dir.empty()) package_dir += "/";
+
+  vector<string> all_files;
+
+  if (IsOuterClassNeeded(params, file)) {
+    string java_filename = package_dir;
+    java_filename += file_generator.classname();
+    java_filename += ".java";
+    all_files.push_back(java_filename);
+
+    // Generate main java file.
+    scoped_ptr<io::ZeroCopyOutputStream> output(
+      output_directory->Open(java_filename));
+    io::Printer printer(output.get(), '$');
+    file_generator.Generate(&printer);
+  }
+
+  // Generate sibling files.
+  file_generator.GenerateSiblings(package_dir, output_directory, &all_files);
+
+  // Generate output list if requested.
+  if (!output_list_file.empty()) {
+    // Generate output list.  This is just a simple text file placed in a
+    // deterministic location which lists the .java files being generated.
+    scoped_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
+      output_directory->Open(output_list_file));
+    io::Printer srclist_printer(srclist_raw_output.get(), '$');
+    for (int i = 0; i < all_files.size(); i++) {
+      srclist_printer.Print("$filename$\n", "filename", all_files[i]);
+    }
+  }
+
+  return true;
+}
+
+}  // namespace java
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_generator.h

@@ -0,0 +1,72 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// Generates Java nano code for a given .proto file.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__
+
+#include <string>
+#include <google/protobuf/compiler/code_generator.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+// CodeGenerator implementation which generates Java nano code.  If you create your
+// own protocol compiler binary and you want it to support Java output for the
+// nano runtime, you can do so by registering an instance of this CodeGenerator with
+// the CommandLineInterface in your main() function.
+class LIBPROTOC_EXPORT JavaNanoGenerator : public CodeGenerator {
+ public:
+  JavaNanoGenerator();
+  ~JavaNanoGenerator();
+
+  // implements CodeGenerator ----------------------------------------
+  bool Generate(const FileDescriptor* file,
+                const string& parameter,
+                GeneratorContext* output_directory,
+                string* error) const;
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(JavaNanoGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__

src/google/protobuf/compiler/javanano/javanano_helpers.cc

@@ -0,0 +1,566 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <limits>
+#include <vector>
+
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/stubs/hash.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/substitute.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+const char kThickSeparator[] =
+  "// ===================================================================\n";
+const char kThinSeparator[] =
+  "// -------------------------------------------------------------------\n";
+
+class RenameKeywords {
+ private:
+  hash_set<string> java_keywords_set_;
+
+ public:
+  RenameKeywords() {
+    static const char* kJavaKeywordsList[] = {
+      // Reserved Java Keywords
+      "abstract", "assert", "boolean", "break", "byte", "case", "catch",
+      "char", "class", "const", "continue", "default", "do", "double", "else",
+      "enum", "extends", "final", "finally", "float", "for", "goto", "if",
+      "implements", "import", "instanceof", "int", "interface", "long",
+      "native", "new", "package", "private", "protected", "public", "return",
+      "short", "static", "strictfp", "super", "switch", "synchronized",
+      "this", "throw", "throws", "transient", "try", "void", "volatile", "while",
+
+      // Reserved Keywords for Literals
+      "false", "null", "true"
+    };
+
+    for (int i = 0; i < GOOGLE_ARRAYSIZE(kJavaKeywordsList); i++) {
+      java_keywords_set_.insert(kJavaKeywordsList[i]);
+    }
+  }
+
+  // Used to rename the a field name if it's a java keyword.  Specifically
+  // this is used to rename the ["name"] or ["capitalized_name"] field params.
+  // (http://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html)
+  string RenameJavaKeywordsImpl(const string& input) {
+    string result = input;
+
+    if (java_keywords_set_.find(result) != java_keywords_set_.end()) {
+      result += "_";
+    }
+
+    return result;
+  }
+
+};
+
+static RenameKeywords sRenameKeywords;
+
+namespace {
+
+const char* kDefaultPackage = "";
+
+const string& FieldName(const FieldDescriptor* field) {
+  // Groups are hacky:  The name of the field is just the lower-cased name
+  // of the group type.  In Java, though, we would like to retain the original
+  // capitalization of the type name.
+  if (field->type() == FieldDescriptor::TYPE_GROUP) {
+    return field->message_type()->name();
+  } else {
+    return field->name();
+  }
+}
+
+string UnderscoresToCamelCaseImpl(const string& input, bool cap_next_letter) {
+  string result;
+  // Note:  I distrust ctype.h due to locales.
+  for (int i = 0; i < input.size(); i++) {
+    if ('a' <= input[i] && input[i] <= 'z') {
+      if (cap_next_letter) {
+        result += input[i] + ('A' - 'a');
+      } else {
+        result += input[i];
+      }
+      cap_next_letter = false;
+    } else if ('A' <= input[i] && input[i] <= 'Z') {
+      if (i == 0 && !cap_next_letter) {
+        // Force first letter to lower-case unless explicitly told to
+        // capitalize it.
+        result += input[i] + ('a' - 'A');
+      } else {
+        // Capital letters after the first are left as-is.
+        result += input[i];
+      }
+      cap_next_letter = false;
+    } else if ('0' <= input[i] && input[i] <= '9') {
+      result += input[i];
+      cap_next_letter = true;
+    } else {
+      cap_next_letter = true;
+    }
+  }
+  return result;
+}
+
+}  // namespace
+
+string UnderscoresToCamelCase(const FieldDescriptor* field) {
+  return UnderscoresToCamelCaseImpl(FieldName(field), false);
+}
+
+string UnderscoresToCapitalizedCamelCase(const FieldDescriptor* field) {
+  return UnderscoresToCamelCaseImpl(FieldName(field), true);
+}
+
+string UnderscoresToCamelCase(const MethodDescriptor* method) {
+  return UnderscoresToCamelCaseImpl(method->name(), false);
+}
+
+string RenameJavaKeywords(const string& input) {
+  return sRenameKeywords.RenameJavaKeywordsImpl(input);
+}
+
+string StripProto(const string& filename) {
+  if (HasSuffixString(filename, ".protodevel")) {
+    return StripSuffixString(filename, ".protodevel");
+  } else {
+    return StripSuffixString(filename, ".proto");
+  }
+}
+
+string FileClassName(const Params& params, const FileDescriptor* file) {
+  if (params.has_java_outer_classname(file->name())) {
+    return params.java_outer_classname(file->name());
+  } else {
+    // Use the filename itself with underscores removed
+    // and a CamelCase style name.
+    string basename;
+    string::size_type last_slash = file->name().find_last_of('/');
+    if (last_slash == string::npos) {
+      basename = file->name();
+    } else {
+      basename = file->name().substr(last_slash + 1);
+    }
+    return UnderscoresToCamelCaseImpl(StripProto(basename), true);
+  }
+}
+
+string FileJavaPackage(const Params& params, const FileDescriptor* file) {
+  if (params.has_java_package(file->name())) {
+    return params.java_package(file->name());
+  } else {
+    string result = kDefaultPackage;
+    if (!file->package().empty()) {
+      if (!result.empty()) result += '.';
+      result += file->package();
+    }
+    return result;
+  }
+}
+
+bool IsOuterClassNeeded(const Params& params, const FileDescriptor* file) {
+  // If java_multiple_files is false, the outer class is always needed.
+  if (!params.java_multiple_files(file->name())) {
+    return true;
+  }
+
+  // File-scope extensions need the outer class as the scope.
+  if (file->extension_count() != 0) {
+    return true;
+  }
+
+  // If container interfaces are not generated, file-scope enums need the
+  // outer class as the scope.
+  if (file->enum_type_count() != 0 && !params.java_enum_style()) {
+    return true;
+  }
+
+  return false;
+}
+
+string ToJavaName(const Params& params, const string& name, bool is_class,
+    const Descriptor* parent, const FileDescriptor* file) {
+  string result;
+  if (parent != NULL) {
+    result.append(ClassName(params, parent));
+  } else if (is_class && params.java_multiple_files(file->name())) {
+    result.append(FileJavaPackage(params, file));
+  } else {
+    result.append(ClassName(params, file));
+  }
+  if (!result.empty()) result.append(1, '.');
+  result.append(RenameJavaKeywords(name));
+  return result;
+}
+
+string ClassName(const Params& params, const FileDescriptor* descriptor) {
+  string result = FileJavaPackage(params, descriptor);
+  if (!result.empty()) result += '.';
+  result += FileClassName(params, descriptor);
+  return result;
+}
+
+string ClassName(const Params& params, const EnumDescriptor* descriptor) {
+  const Descriptor* parent = descriptor->containing_type();
+  // When using Java enum style, an enum's class name contains the enum name.
+  // Use the standard ToJavaName translation.
+  if (params.java_enum_style()) {
+    return ToJavaName(params, descriptor->name(), true, parent,
+                      descriptor->file());
+  }
+  // Otherwise the enum members are accessed from the enclosing class.
+  if (parent != NULL) {
+    return ClassName(params, parent);
+  } else {
+    return ClassName(params, descriptor->file());
+  }
+}
+
+string FieldConstantName(const FieldDescriptor *field) {
+  string name = field->name() + "_FIELD_NUMBER";
+  UpperString(&name);
+  return name;
+}
+
+string FieldDefaultConstantName(const FieldDescriptor *field) {
+  return "_" + RenameJavaKeywords(UnderscoresToCamelCase(field)) + "Default";
+}
+
+void PrintFieldComment(io::Printer* printer, const FieldDescriptor* field) {
+  // We don't want to print group bodies so we cut off after the first line
+  // (the second line for extensions).
+  string def = field->DebugString();
+  string::size_type first_line_end = def.find_first_of('\n');
+  printer->Print("// $def$\n",
+    "def", def.substr(0, first_line_end));
+  if (field->is_extension()) {
+    string::size_type second_line_start = first_line_end + 1;
+    string::size_type second_line_length =
+        def.find('\n', second_line_start) - second_line_start;
+    printer->Print("// $def$\n",
+      "def", def.substr(second_line_start, second_line_length));
+  }
+}
+
+JavaType GetJavaType(FieldDescriptor::Type field_type) {
+  switch (field_type) {
+    case FieldDescriptor::TYPE_INT32:
+    case FieldDescriptor::TYPE_UINT32:
+    case FieldDescriptor::TYPE_SINT32:
+    case FieldDescriptor::TYPE_FIXED32:
+    case FieldDescriptor::TYPE_SFIXED32:
+      return JAVATYPE_INT;
+
+    case FieldDescriptor::TYPE_INT64:
+    case FieldDescriptor::TYPE_UINT64:
+    case FieldDescriptor::TYPE_SINT64:
+    case FieldDescriptor::TYPE_FIXED64:
+    case FieldDescriptor::TYPE_SFIXED64:
+      return JAVATYPE_LONG;
+
+    case FieldDescriptor::TYPE_FLOAT:
+      return JAVATYPE_FLOAT;
+
+    case FieldDescriptor::TYPE_DOUBLE:
+      return JAVATYPE_DOUBLE;
+
+    case FieldDescriptor::TYPE_BOOL:
+      return JAVATYPE_BOOLEAN;
+
+    case FieldDescriptor::TYPE_STRING:
+      return JAVATYPE_STRING;
+
+    case FieldDescriptor::TYPE_BYTES:
+      return JAVATYPE_BYTES;
+
+    case FieldDescriptor::TYPE_ENUM:
+      return JAVATYPE_ENUM;
+
+    case FieldDescriptor::TYPE_GROUP:
+    case FieldDescriptor::TYPE_MESSAGE:
+      return JAVATYPE_MESSAGE;
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return JAVATYPE_INT;
+}
+
+string PrimitiveTypeName(JavaType type) {
+  switch (type) {
+    case JAVATYPE_INT    : return "int";
+    case JAVATYPE_LONG   : return "long";
+    case JAVATYPE_FLOAT  : return "float";
+    case JAVATYPE_DOUBLE : return "double";
+    case JAVATYPE_BOOLEAN: return "boolean";
+    case JAVATYPE_STRING : return "java.lang.String";
+    case JAVATYPE_BYTES  : return "byte[]";
+    case JAVATYPE_ENUM   : return "int";
+    case JAVATYPE_MESSAGE: return "";
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return "";
+}
+
+string BoxedPrimitiveTypeName(JavaType type) {
+  switch (type) {
+    case JAVATYPE_INT    : return "java.lang.Integer";
+    case JAVATYPE_LONG   : return "java.lang.Long";
+    case JAVATYPE_FLOAT  : return "java.lang.Float";
+    case JAVATYPE_DOUBLE : return "java.lang.Double";
+    case JAVATYPE_BOOLEAN: return "java.lang.Boolean";
+    case JAVATYPE_STRING : return "java.lang.String";
+    case JAVATYPE_BYTES  : return "byte[]";
+    case JAVATYPE_ENUM   : return "java.lang.Integer";
+    case JAVATYPE_MESSAGE: return "";
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return "";
+}
+
+string EmptyArrayName(const Params& params, const FieldDescriptor* field) {
+  switch (GetJavaType(field)) {
+    case JAVATYPE_INT    : return "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
+    case JAVATYPE_LONG   : return "com.google.protobuf.nano.WireFormatNano.EMPTY_LONG_ARRAY";
+    case JAVATYPE_FLOAT  : return "com.google.protobuf.nano.WireFormatNano.EMPTY_FLOAT_ARRAY";
+    case JAVATYPE_DOUBLE : return "com.google.protobuf.nano.WireFormatNano.EMPTY_DOUBLE_ARRAY";
+    case JAVATYPE_BOOLEAN: return "com.google.protobuf.nano.WireFormatNano.EMPTY_BOOLEAN_ARRAY";
+    case JAVATYPE_STRING : return "com.google.protobuf.nano.WireFormatNano.EMPTY_STRING_ARRAY";
+    case JAVATYPE_BYTES  : return "com.google.protobuf.nano.WireFormatNano.EMPTY_BYTES_ARRAY";
+    case JAVATYPE_ENUM   : return "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
+    case JAVATYPE_MESSAGE: return ClassName(params, field->message_type()) + ".EMPTY_ARRAY";
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return "";
+}
+
+string DefaultValue(const Params& params, const FieldDescriptor* field) {
+  if (field->label() == FieldDescriptor::LABEL_REPEATED) {
+    return EmptyArrayName(params, field);
+  }
+
+  if (params.use_reference_types_for_primitives()) {
+    if (params.reftypes_primitive_enums()
+          && field->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
+      return "Integer.MIN_VALUE";
+    }
+    return "null";
+  }
+
+  // Switch on cpp_type since we need to know which default_value_* method
+  // of FieldDescriptor to call.
+  switch (field->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_INT32:
+      return SimpleItoa(field->default_value_int32());
+    case FieldDescriptor::CPPTYPE_UINT32:
+      // Need to print as a signed int since Java has no unsigned.
+      return SimpleItoa(static_cast<int32>(field->default_value_uint32()));
+    case FieldDescriptor::CPPTYPE_INT64:
+      return SimpleItoa(field->default_value_int64()) + "L";
+    case FieldDescriptor::CPPTYPE_UINT64:
+      return SimpleItoa(static_cast<int64>(field->default_value_uint64())) +
+             "L";
+    case FieldDescriptor::CPPTYPE_DOUBLE: {
+      double value = field->default_value_double();
+      if (value == numeric_limits<double>::infinity()) {
+        return "Double.POSITIVE_INFINITY";
+      } else if (value == -numeric_limits<double>::infinity()) {
+        return "Double.NEGATIVE_INFINITY";
+      } else if (value != value) {
+        return "Double.NaN";
+      } else {
+        return SimpleDtoa(value) + "D";
+      }
+    }
+    case FieldDescriptor::CPPTYPE_FLOAT: {
+      float value = field->default_value_float();
+      if (value == numeric_limits<float>::infinity()) {
+        return "Float.POSITIVE_INFINITY";
+      } else if (value == -numeric_limits<float>::infinity()) {
+        return "Float.NEGATIVE_INFINITY";
+      } else if (value != value) {
+        return "Float.NaN";
+      } else {
+        return SimpleFtoa(value) + "F";
+      }
+    }
+    case FieldDescriptor::CPPTYPE_BOOL:
+      return field->default_value_bool() ? "true" : "false";
+    case FieldDescriptor::CPPTYPE_STRING:
+      if (!field->default_value_string().empty()) {
+        // Point it to the static final in the generated code.
+        return FieldDefaultConstantName(field);
+      } else {
+        if (field->type() == FieldDescriptor::TYPE_BYTES) {
+          return "com.google.protobuf.nano.WireFormatNano.EMPTY_BYTES";
+        } else {
+          return "\"\"";
+        }
+      }
+
+    case FieldDescriptor::CPPTYPE_ENUM:
+      return ClassName(params, field->enum_type()) + "." +
+             RenameJavaKeywords(field->default_value_enum()->name());
+
+    case FieldDescriptor::CPPTYPE_MESSAGE:
+      return "null";
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return "";
+}
+
+
+static const char* kBitMasks[] = {
+  "0x00000001",
+  "0x00000002",
+  "0x00000004",
+  "0x00000008",
+  "0x00000010",
+  "0x00000020",
+  "0x00000040",
+  "0x00000080",
+
+  "0x00000100",
+  "0x00000200",
+  "0x00000400",
+  "0x00000800",
+  "0x00001000",
+  "0x00002000",
+  "0x00004000",
+  "0x00008000",
+
+  "0x00010000",
+  "0x00020000",
+  "0x00040000",
+  "0x00080000",
+  "0x00100000",
+  "0x00200000",
+  "0x00400000",
+  "0x00800000",
+
+  "0x01000000",
+  "0x02000000",
+  "0x04000000",
+  "0x08000000",
+  "0x10000000",
+  "0x20000000",
+  "0x40000000",
+  "0x80000000",
+};
+
+string GetBitFieldName(int index) {
+  string var_name = "bitField";
+  var_name += SimpleItoa(index);
+  var_name += "_";
+  return var_name;
+}
+
+string GetBitFieldNameForBit(int bit_index) {
+  return GetBitFieldName(bit_index / 32);
+}
+
+string GenerateGetBit(int bit_index) {
+  string var_name = GetBitFieldNameForBit(bit_index);
+  int bit_in_var_index = bit_index % 32;
+
+  string mask = kBitMasks[bit_in_var_index];
+  string result = "((" + var_name + " & " + mask + ") != 0)";
+  return result;
+}
+
+string GenerateSetBit(int bit_index) {
+  string var_name = GetBitFieldNameForBit(bit_index);
+  int bit_in_var_index = bit_index % 32;
+
+  string mask = kBitMasks[bit_in_var_index];
+  string result = var_name + " |= " + mask;
+  return result;
+}
+
+string GenerateClearBit(int bit_index) {
+  string var_name = GetBitFieldNameForBit(bit_index);
+  int bit_in_var_index = bit_index % 32;
+
+  string mask = kBitMasks[bit_in_var_index];
+  string result = var_name + " = (" + var_name + " & ~" + mask + ")";
+  return result;
+}
+
+string GenerateDifferentBit(int bit_index) {
+  string var_name = GetBitFieldNameForBit(bit_index);
+  int bit_in_var_index = bit_index % 32;
+
+  string mask = kBitMasks[bit_in_var_index];
+  string result = "((" + var_name + " & " + mask
+      + ") != (other." + var_name + " & " + mask + "))";
+  return result;
+}
+
+void SetBitOperationVariables(const string name,
+    int bitIndex, map<string, string>* variables) {
+  (*variables)["get_" + name] = GenerateGetBit(bitIndex);
+  (*variables)["set_" + name] = GenerateSetBit(bitIndex);
+  (*variables)["clear_" + name] = GenerateClearBit(bitIndex);
+  (*variables)["different_" + name] = GenerateDifferentBit(bitIndex);
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_helpers.h

@@ -0,0 +1,189 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__
+
+#include <string>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/io/printer.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+// Commonly-used separator comments.  Thick is a line of '=', thin is a line
+// of '-'.
+extern const char kThickSeparator[];
+extern const char kThinSeparator[];
+
+// Converts the field's name to camel-case, e.g. "foo_bar_baz" becomes
+// "fooBarBaz" or "FooBarBaz", respectively.
+string UnderscoresToCamelCase(const FieldDescriptor* field);
+string UnderscoresToCapitalizedCamelCase(const FieldDescriptor* field);
+
+// Appends an "_" to the end of a field where the name is a reserved java
+// keyword.  For example int32 public = 1 will generate int public_.
+string RenameJavaKeywords(const string& input);
+
+// Similar, but for method names.  (Typically, this merely has the effect
+// of lower-casing the first letter of the name.)
+string UnderscoresToCamelCase(const MethodDescriptor* method);
+
+// Strips ".proto" or ".protodevel" from the end of a filename.
+string StripProto(const string& filename);
+
+// Gets the unqualified class name for the file.  Each .proto file becomes a
+// single Java class, with all its contents nested in that class.
+string FileClassName(const Params& params, const FileDescriptor* file);
+
+// Returns the file's Java package name.
+string FileJavaPackage(const Params& params, const FileDescriptor* file);
+
+// Returns whether the Java outer class is needed, i.e. whether the option
+// java_multiple_files is false, or the proto file contains any file-scope
+// enums/extensions.
+bool IsOuterClassNeeded(const Params& params, const FileDescriptor* file);
+
+// Converts the given simple name of a proto entity to its fully-qualified name
+// in the Java namespace, given that it is in the given file enclosed in the
+// given parent message (or NULL for file-scope entities). Whether the file's
+// outer class name should be included in the return value depends on factors
+// inferrable from the given arguments, including is_class which indicates
+// whether the entity translates to a Java class.
+string ToJavaName(const Params& params, const string& name, bool is_class,
+    const Descriptor* parent, const FileDescriptor* file);
+
+// These return the fully-qualified class name corresponding to the given
+// descriptor.
+inline string ClassName(const Params& params, const Descriptor* descriptor) {
+  return ToJavaName(params, descriptor->name(), true,
+                    descriptor->containing_type(), descriptor->file());
+}
+string ClassName(const Params& params, const EnumDescriptor* descriptor);
+inline string ClassName(const Params& params,
+    const ServiceDescriptor* descriptor) {
+  return ToJavaName(params, descriptor->name(), true, NULL, descriptor->file());
+}
+inline string ExtensionIdentifierName(const Params& params,
+    const FieldDescriptor* descriptor) {
+  return ToJavaName(params, descriptor->name(), false,
+                    descriptor->extension_scope(), descriptor->file());
+}
+string ClassName(const Params& params, const FileDescriptor* descriptor);
+
+// Get the unqualified name that should be used for a field's field
+// number constant.
+string FieldConstantName(const FieldDescriptor *field);
+
+string FieldDefaultConstantName(const FieldDescriptor *field);
+
+// Print the field's proto-syntax definition as a comment.
+void PrintFieldComment(io::Printer* printer, const FieldDescriptor* field);
+
+enum JavaType {
+  JAVATYPE_INT,
+  JAVATYPE_LONG,
+  JAVATYPE_FLOAT,
+  JAVATYPE_DOUBLE,
+  JAVATYPE_BOOLEAN,
+  JAVATYPE_STRING,
+  JAVATYPE_BYTES,
+  JAVATYPE_ENUM,
+  JAVATYPE_MESSAGE
+};
+
+JavaType GetJavaType(FieldDescriptor::Type field_type);
+
+inline JavaType GetJavaType(const FieldDescriptor* field) {
+  return GetJavaType(field->type());
+}
+
+string PrimitiveTypeName(JavaType type);
+
+// Get the fully-qualified class name for a boxed primitive type, e.g.
+// "java.lang.Integer" for JAVATYPE_INT.  Returns NULL for enum and message
+// types.
+string BoxedPrimitiveTypeName(JavaType type);
+
+string EmptyArrayName(const Params& params, const FieldDescriptor* field);
+
+string DefaultValue(const Params& params, const FieldDescriptor* field);
+
+
+// Methods for shared bitfields.
+
+// Gets the name of the shared bitfield for the given field index.
+string GetBitFieldName(int index);
+
+// Gets the name of the shared bitfield for the given bit index.
+// Effectively, GetBitFieldName(bit_index / 32)
+string GetBitFieldNameForBit(int bit_index);
+
+// Generates the java code for the expression that returns whether the bit at
+// the given bit index is set.
+// Example: "((bitField1_ & 0x04000000) != 0)"
+string GenerateGetBit(int bit_index);
+
+// Generates the java code for the expression that sets the bit at the given
+// bit index.
+// Example: "bitField1_ |= 0x04000000"
+string GenerateSetBit(int bit_index);
+
+// Generates the java code for the expression that clears the bit at the given
+// bit index.
+// Example: "bitField1_ = (bitField1_ & ~0x04000000)"
+string GenerateClearBit(int bit_index);
+
+// Generates the java code for the expression that returns whether the bit at
+// the given bit index contains different values in the current object and
+// another object accessible via the variable 'other'.
+// Example: "((bitField1_ & 0x04000000) != (other.bitField1_ & 0x04000000))"
+string GenerateDifferentBit(int bit_index);
+
+// Sets the 'get_*', 'set_*', 'clear_*' and 'different_*' variables, where * is
+// the given name of the bit, to the appropriate Java expressions for the given
+// bit index.
+void SetBitOperationVariables(const string name,
+    int bitIndex, map<string, string>* variables);
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__

src/google/protobuf/compiler/javanano/javanano_message.cc

@@ -0,0 +1,555 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <algorithm>
+#include <google/protobuf/stubs/hash.h>
+#include <google/protobuf/compiler/javanano/javanano_message.h>
+#include <google/protobuf/compiler/javanano/javanano_enum.h>
+#include <google/protobuf/compiler/javanano/javanano_extension.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/descriptor.pb.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+using internal::WireFormat;
+using internal::WireFormatLite;
+
+namespace {
+
+struct FieldOrderingByNumber {
+  inline bool operator()(const FieldDescriptor* a,
+                         const FieldDescriptor* b) const {
+    return a->number() < b->number();
+  }
+};
+
+// Sort the fields of the given Descriptor by number into a new[]'d array
+// and return it.
+const FieldDescriptor** SortFieldsByNumber(const Descriptor* descriptor) {
+  const FieldDescriptor** fields =
+    new const FieldDescriptor*[descriptor->field_count()];
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    fields[i] = descriptor->field(i);
+  }
+  sort(fields, fields + descriptor->field_count(),
+       FieldOrderingByNumber());
+  return fields;
+}
+
+}  // namespace
+
+// ===================================================================
+
+MessageGenerator::MessageGenerator(const Descriptor* descriptor, const Params& params)
+  : params_(params),
+    descriptor_(descriptor),
+    field_generators_(descriptor, params) {
+}
+
+MessageGenerator::~MessageGenerator() {}
+
+void MessageGenerator::GenerateStaticVariables(io::Printer* printer) {
+  // Generate static members for all nested types.
+  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
+    // TODO(kenton):  Reuse MessageGenerator objects?
+    MessageGenerator(descriptor_->nested_type(i), params_)
+      .GenerateStaticVariables(printer);
+  }
+}
+
+void MessageGenerator::GenerateStaticVariableInitializers(
+    io::Printer* printer) {
+  // Generate static member initializers for all nested types.
+  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
+   // TODO(kenton):  Reuse MessageGenerator objects?
+    MessageGenerator(descriptor_->nested_type(i), params_)
+      .GenerateStaticVariableInitializers(printer);
+  }
+}
+
+void MessageGenerator::Generate(io::Printer* printer) {
+  if (!params_.store_unknown_fields() &&
+      (descriptor_->extension_count() != 0 || descriptor_->extension_range_count() != 0)) {
+    GOOGLE_LOG(FATAL) << "Extensions are only supported in NANO_RUNTIME if the "
+        "'store_unknown_fields' generator option is 'true'\n";
+  }
+
+  const string& file_name = descriptor_->file()->name();
+  bool is_own_file =
+    params_.java_multiple_files(file_name)
+      && descriptor_->containing_type() == NULL;
+
+  if (is_own_file) {
+    // Note: constants (from enums and fields requiring stored defaults, emitted in the loop below)
+    // may have the same names as constants in the nested classes. This causes Java warnings, but
+    // is not fatal, so we suppress those warnings here in the top-most class declaration.
+    printer->Print(
+      "\n"
+      "@SuppressWarnings(\"hiding\")\n"
+      "public final class $classname$ extends\n",
+      "classname", descriptor_->name());
+  } else {
+    printer->Print(
+      "\n"
+      "public static final class $classname$ extends\n",
+      "classname", descriptor_->name());
+  }
+  if (params_.store_unknown_fields() && params_.parcelable_messages()) {
+    printer->Print(
+      "    com.google.protobuf.nano.android.ParcelableExtendableMessageNano<$classname$> {\n",
+      "classname", descriptor_->name());
+  } else if (params_.store_unknown_fields()) {
+    printer->Print(
+      "    com.google.protobuf.nano.ExtendableMessageNano<$classname$> {\n",
+      "classname", descriptor_->name());
+  } else if (params_.parcelable_messages()) {
+    printer->Print(
+      "    com.google.protobuf.nano.android.ParcelableMessageNano {\n");
+  } else {
+    printer->Print(
+      "    com.google.protobuf.nano.MessageNano {\n");
+  }
+  printer->Indent();
+
+  // Nested types and extensions
+  for (int i = 0; i < descriptor_->extension_count(); i++) {
+    ExtensionGenerator(descriptor_->extension(i), params_).Generate(printer);
+  }
+
+  for (int i = 0; i < descriptor_->enum_type_count(); i++) {
+    EnumGenerator(descriptor_->enum_type(i), params_).Generate(printer);
+  }
+
+  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
+    MessageGenerator(descriptor_->nested_type(i), params_).Generate(printer);
+  }
+
+  // Lazy initialization of otherwise static final fields can help prevent the
+  // class initializer from being generated. We want to prevent it because it
+  // stops ProGuard from inlining any methods in this class into call sites and
+  // therefore reducing the method count. However, extensions are best kept as
+  // public static final fields with initializers, so with their existence we
+  // won't bother with lazy initialization.
+  bool lazy_init = descriptor_->extension_count() == 0;
+
+  // Empty array
+  if (lazy_init) {
+    printer->Print(
+      "\n"
+      "private static volatile $classname$[] _emptyArray;\n"
+      "public static $classname$[] emptyArray() {\n"
+      "  // Lazily initializes the empty array\n"
+      "  if (_emptyArray == null) {\n"
+      "    synchronized (\n"
+      "        com.google.protobuf.nano.InternalNano.LAZY_INIT_LOCK) {\n"
+      "      if (_emptyArray == null) {\n"
+      "        _emptyArray = new $classname$[0];\n"
+      "      }\n"
+      "    }\n"
+      "  }\n"
+      "  return _emptyArray;\n"
+      "}\n",
+      "classname", descriptor_->name());
+  } else {
+    printer->Print(
+      "\n"
+      "private static final $classname$[] EMPTY_ARRAY = {};\n"
+      "public static $classname$[] emptyArray() {\n"
+      "  return EMPTY_ARRAY;\n"
+      "}\n",
+      "classname", descriptor_->name());
+  }
+
+  // Integers for bit fields
+  int totalInts = (field_generators_.total_bits() + 31) / 32;
+  if (totalInts > 0) {
+    printer->Print("\n");
+    for (int i = 0; i < totalInts; i++) {
+      printer->Print("private int $bit_field_name$;\n",
+        "bit_field_name", GetBitFieldName(i));
+    }
+  }
+
+  // Fields and maybe their default values
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    printer->Print("\n");
+    PrintFieldComment(printer, descriptor_->field(i));
+    field_generators_.get(descriptor_->field(i)).GenerateMembers(
+        printer, lazy_init);
+  }
+
+  // Constructor, with lazy init code if needed
+  if (lazy_init && field_generators_.saved_defaults_needed()) {
+    printer->Print(
+      "\n"
+      "private static volatile boolean _classInitialized;\n"
+      "\n"
+      "public $classname$() {\n"
+      "  // Lazily initializes the field defaults\n"
+      "  if (!_classInitialized) {\n"
+      "    synchronized (\n"
+      "        com.google.protobuf.nano.InternalNano.LAZY_INIT_LOCK) {\n"
+      "      if (!_classInitialized) {\n",
+      "classname", descriptor_->name());
+    printer->Indent();
+    printer->Indent();
+    printer->Indent();
+    printer->Indent();
+    for (int i = 0; i < descriptor_->field_count(); i++) {
+      field_generators_.get(descriptor_->field(i))
+          .GenerateInitSavedDefaultCode(printer);
+    }
+    printer->Outdent();
+    printer->Outdent();
+    printer->Outdent();
+    printer->Outdent();
+    printer->Print(
+      "        _classInitialized = true;\n"
+      "      }\n"
+      "    }\n"
+      "  }\n");
+    if (params_.generate_clear()) {
+      printer->Print("  clear();\n");
+    }
+    printer->Print("}\n");
+  } else {
+    if (params_.generate_clear()) {
+      printer->Print(
+        "\n"
+        "public $classname$() {\n"
+        "  clear();\n"
+        "}\n",
+        "classname", descriptor_->name());
+    }
+  }
+
+  // Other methods in this class
+
+  GenerateClear(printer);
+
+  if (params_.generate_equals()) {
+    GenerateEquals(printer);
+    GenerateHashCode(printer);
+  }
+
+  GenerateMessageSerializationMethods(printer);
+  GenerateMergeFromMethods(printer);
+  GenerateParseFromMethods(printer);
+
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+// ===================================================================
+
+void MessageGenerator::
+GenerateMessageSerializationMethods(io::Printer* printer) {
+  // Rely on the parent implementations of writeTo() and getSerializedSize()
+  // if there are no fields to serialize in this message.
+  if (descriptor_->field_count() == 0) {
+    return;
+  }
+
+  scoped_array<const FieldDescriptor*> sorted_fields(
+    SortFieldsByNumber(descriptor_));
+
+  printer->Print(
+    "\n"
+    "@Override\n"
+    "public void writeTo(com.google.protobuf.nano.CodedOutputByteBufferNano output)\n"
+    "    throws java.io.IOException {\n");
+  printer->Indent();
+
+  // Output the fields in sorted order
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    GenerateSerializeOneField(printer, sorted_fields[i]);
+  }
+
+  // The parent implementation will write any unknown fields if necessary.
+  printer->Print(
+    "super.writeTo(output);\n");
+
+  printer->Outdent();
+  printer->Print("}\n");
+
+  // The parent implementation will get the serialized size for unknown
+  // fields if necessary.
+  printer->Print(
+    "\n"
+    "@Override\n"
+    "protected int computeSerializedSize() {\n"
+    "  int size = super.computeSerializedSize();\n");
+  printer->Indent();
+
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    field_generators_.get(sorted_fields[i]).GenerateSerializedSizeCode(printer);
+  }
+
+  printer->Outdent();
+  printer->Print(
+    "  return size;\n"
+    "}\n");
+}
+
+void MessageGenerator::GenerateMergeFromMethods(io::Printer* printer) {
+  scoped_array<const FieldDescriptor*> sorted_fields(
+    SortFieldsByNumber(descriptor_));
+
+  printer->Print(
+    "\n"
+    "@Override\n"
+    "public $classname$ mergeFrom(\n"
+    "        com.google.protobuf.nano.CodedInputByteBufferNano input)\n"
+    "    throws java.io.IOException {\n",
+    "classname", descriptor_->name());
+
+  printer->Indent();
+
+  printer->Print(
+    "while (true) {\n");
+  printer->Indent();
+
+  printer->Print(
+    "int tag = input.readTag();\n"
+    "switch (tag) {\n");
+  printer->Indent();
+
+  printer->Print(
+    "case 0:\n"          // zero signals EOF / limit reached
+    "  return this;\n"
+    "default: {\n");
+
+  printer->Indent();
+  if (params_.store_unknown_fields()) {
+    printer->Print(
+        "if (!storeUnknownField(input, tag)) {\n"
+        "  return this;\n"
+        "}\n");
+  } else {
+    printer->Print(
+        "if (!com.google.protobuf.nano.WireFormatNano.parseUnknownField(input, tag)) {\n"
+        "  return this;\n"   // it's an endgroup tag
+        "}\n");
+  }
+  printer->Print("break;\n");
+  printer->Outdent();
+  printer->Print("}\n");
+
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = sorted_fields[i];
+    uint32 tag = WireFormatLite::MakeTag(field->number(),
+      WireFormat::WireTypeForFieldType(field->type()));
+
+    printer->Print(
+      "case $tag$: {\n",
+      "tag", SimpleItoa(tag));
+    printer->Indent();
+
+    field_generators_.get(field).GenerateMergingCode(printer);
+
+    printer->Outdent();
+    printer->Print(
+      "  break;\n"
+      "}\n");
+
+    if (field->is_packable()) {
+      // To make packed = true wire compatible, we generate parsing code from a
+      // packed version of this field regardless of field->options().packed().
+      uint32 packed_tag = WireFormatLite::MakeTag(field->number(),
+        WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
+      printer->Print(
+        "case $tag$: {\n",
+        "tag", SimpleItoa(packed_tag));
+      printer->Indent();
+
+      field_generators_.get(field).GenerateMergingCodeFromPacked(printer);
+
+      printer->Outdent();
+      printer->Print(
+        "  break;\n"
+        "}\n");
+    }
+  }
+
+  printer->Outdent();
+  printer->Outdent();
+  printer->Outdent();
+  printer->Print(
+    "    }\n"     // switch (tag)
+    "  }\n"       // while (true)
+    "}\n");
+}
+
+void MessageGenerator::
+GenerateParseFromMethods(io::Printer* printer) {
+  // Note:  These are separate from GenerateMessageSerializationMethods()
+  //   because they need to be generated even for messages that are optimized
+  //   for code size.
+  printer->Print(
+    "\n"
+    "public static $classname$ parseFrom(byte[] data)\n"
+    "    throws com.google.protobuf.nano.InvalidProtocolBufferNanoException {\n"
+    "  return com.google.protobuf.nano.MessageNano.mergeFrom(new $classname$(), data);\n"
+    "}\n"
+    "\n"
+    "public static $classname$ parseFrom(\n"
+    "        com.google.protobuf.nano.CodedInputByteBufferNano input)\n"
+    "    throws java.io.IOException {\n"
+    "  return new $classname$().mergeFrom(input);\n"
+    "}\n",
+    "classname", descriptor_->name());
+}
+
+void MessageGenerator::GenerateSerializeOneField(
+    io::Printer* printer, const FieldDescriptor* field) {
+  field_generators_.get(field).GenerateSerializationCode(printer);
+}
+
+void MessageGenerator::GenerateClear(io::Printer* printer) {
+  if (!params_.generate_clear()) {
+    return;
+  }
+  printer->Print(
+    "\n"
+    "public $classname$ clear() {\n",
+    "classname", descriptor_->name());
+  printer->Indent();
+
+  // Clear bit fields.
+  int totalInts = (field_generators_.total_bits() + 31) / 32;
+  for (int i = 0; i < totalInts; i++) {
+    printer->Print("$bit_field_name$ = 0;\n",
+      "bit_field_name", GetBitFieldName(i));
+  }
+
+  // Call clear for all of the fields.
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = descriptor_->field(i);
+    field_generators_.get(field).GenerateClearCode(printer);
+  }
+
+  // Clear unknown fields.
+  if (params_.store_unknown_fields()) {
+    printer->Print("unknownFieldData = null;\n");
+  }
+
+  printer->Outdent();
+  printer->Print(
+    "  cachedSize = -1;\n"
+    "  return this;\n"
+    "}\n");
+}
+
+void MessageGenerator::GenerateEquals(io::Printer* printer) {
+  // Don't override if there are no fields. We could generate an
+  // equals method that compares types, but often empty messages
+  // are used as namespaces.
+  if (descriptor_->field_count() == 0 && !params_.store_unknown_fields()) {
+    return;
+  }
+
+  printer->Print(
+    "\n"
+    "@Override\n"
+    "public boolean equals(Object o) {\n");
+  printer->Indent();
+  printer->Print(
+    "if (o == this) {\n"
+    "  return true;\n"
+    "}\n"
+    "if (!(o instanceof $classname$)) {\n"
+    "  return false;\n"
+    "}\n"
+    "$classname$ other = ($classname$) o;\n",
+    "classname", descriptor_->name());
+
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = descriptor_->field(i);
+    field_generators_.get(field).GenerateEqualsCode(printer);
+  }
+
+  if (params_.store_unknown_fields()) {
+    printer->Print(
+      "return unknownFieldDataEquals(other);\n");
+  } else {
+    printer->Print(
+      "return true;\n");
+  }
+
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+void MessageGenerator::GenerateHashCode(io::Printer* printer) {
+  if (descriptor_->field_count() == 0 && !params_.store_unknown_fields()) {
+    return;
+  }
+
+  printer->Print(
+    "\n"
+    "@Override\n"
+    "public int hashCode() {\n");
+  printer->Indent();
+
+  printer->Print("int result = 17;\n");
+  printer->Print("result = 31 * result + getClass().getName().hashCode();\n");
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = descriptor_->field(i);
+    field_generators_.get(field).GenerateHashCodeCode(printer);
+  }
+
+  if (params_.store_unknown_fields()) {
+    printer->Print(
+      "result = 31 * result + unknownFieldDataHashCode();\n");
+  }
+
+  printer->Print("return result;\n");
+
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+// ===================================================================
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_message.h

@@ -0,0 +1,95 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__
+
+#include <string>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/compiler/javanano/javanano_field.h>
+#include <google/protobuf/compiler/javanano/javanano_params.h>
+#include <google/protobuf/stubs/common.h>
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class Printer;             // printer.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class MessageGenerator {
+ public:
+  explicit MessageGenerator(const Descriptor* descriptor, const Params& params);
+  ~MessageGenerator();
+
+  // All static variables have to be declared at the top-level of the file
+  // so that we can control initialization order, which is important for
+  // DescriptorProto bootstrapping to work.
+  void GenerateStaticVariables(io::Printer* printer);
+
+  // Output code which initializes the static variables generated by
+  // GenerateStaticVariables().
+  void GenerateStaticVariableInitializers(io::Printer* printer);
+
+  // Generate the class itself.
+  void Generate(io::Printer* printer);
+
+ private:
+  void GenerateMessageSerializationMethods(io::Printer* printer);
+  void GenerateMergeFromMethods(io::Printer* printer);
+  void GenerateParseFromMethods(io::Printer* printer);
+  void GenerateSerializeOneField(io::Printer* printer,
+                                 const FieldDescriptor* field);
+
+  void GenerateClear(io::Printer* printer);
+  void GenerateEquals(io::Printer* printer);
+  void GenerateHashCode(io::Printer* printer);
+
+  const Params& params_;
+  const Descriptor* descriptor_;
+  FieldGeneratorMap field_generators_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__

src/google/protobuf/compiler/javanano/javanano_message_field.cc

@@ -0,0 +1,259 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <map>
+#include <string>
+
+#include <google/protobuf/compiler/javanano/javanano_message_field.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+using internal::WireFormat;
+using internal::WireFormatLite;
+
+namespace {
+
+// TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
+//   repeat code between this and the other field types.
+void SetMessageVariables(const Params& params,
+    const FieldDescriptor* descriptor, map<string, string>* variables) {
+  (*variables)["name"] =
+    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
+  (*variables)["capitalized_name"] =
+    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
+  (*variables)["number"] = SimpleItoa(descriptor->number());
+  (*variables)["type"] = ClassName(params, descriptor->message_type());
+  (*variables)["group_or_message"] =
+    (descriptor->type() == FieldDescriptor::TYPE_GROUP) ?
+    "Group" : "Message";
+  (*variables)["message_name"] = descriptor->containing_type()->name();
+  //(*variables)["message_type"] = descriptor->message_type()->name();
+  (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
+}
+
+}  // namespace
+
+// ===================================================================
+
+MessageFieldGenerator::
+MessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetMessageVariables(params, descriptor, &variables_);
+}
+
+MessageFieldGenerator::~MessageFieldGenerator() {}
+
+void MessageFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
+  printer->Print(variables_,
+    "public $type$ $name$;\n");
+}
+
+void MessageFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = null;\n");
+}
+
+void MessageFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ == null) {\n"
+    "  this.$name$ = new $type$();\n"
+    "}\n");
+
+  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
+    printer->Print(variables_,
+      "input.readGroup(this.$name$, $number$);\n");
+  } else {
+    printer->Print(variables_,
+      "input.readMessage(this.$name$);\n");
+  }
+}
+
+void MessageFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null) {\n"
+    "  output.write$group_or_message$($number$, this.$name$);\n"
+    "}\n");
+}
+
+void MessageFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null) {\n"
+    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+    "    .compute$group_or_message$Size($number$, this.$name$);\n"
+    "}\n");
+}
+
+void MessageFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ == null) { \n"
+    "  if (other.$name$ != null) {\n"
+    "    return false;\n"
+    "  }\n"
+    "} else {\n"
+    "  if (!this.$name$.equals(other.$name$)) {\n"
+    "    return false;\n"
+    "  }\n"
+    "}\n");
+}
+
+void MessageFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "result = 31 * result +\n"
+    "    (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
+}
+
+// ===================================================================
+
+RepeatedMessageFieldGenerator::
+RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetMessageVariables(params, descriptor, &variables_);
+}
+
+RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}
+
+void RepeatedMessageFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
+  printer->Print(variables_,
+    "public $type$[] $name$;\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = $type$.emptyArray();\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  // First, figure out the length of the array, then parse.
+  printer->Print(variables_,
+    "int arrayLength = com.google.protobuf.nano.WireFormatNano\n"
+    "    .getRepeatedFieldArrayLength(input, $tag$);\n"
+    "int i = this.$name$ == null ? 0 : this.$name$.length;\n"
+    "$type$[] newArray =\n"
+    "    new $type$[i + arrayLength];\n"
+    "if (i != 0) {\n"
+    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
+    "}\n"
+    "for (; i < newArray.length - 1; i++) {\n"
+    "  newArray[i] = new $type$();\n");
+
+  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
+    printer->Print(variables_,
+      "  input.readGroup(newArray[i], $number$);\n");
+  } else {
+    printer->Print(variables_,
+      "  input.readMessage(newArray[i]);\n");
+  }
+
+  printer->Print(variables_,
+    "  input.readTag();\n"
+    "}\n"
+    "// Last one without readTag.\n"
+    "newArray[i] = new $type$();\n");
+
+  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
+    printer->Print(variables_,
+      "input.readGroup(newArray[i], $number$);\n");
+  } else {
+    printer->Print(variables_,
+      "input.readMessage(newArray[i]);\n");
+  }
+
+  printer->Print(variables_,
+    "this.$name$ = newArray;\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n"
+    "  for (int i = 0; i < this.$name$.length; i++) {\n"
+    "    $type$ element = this.$name$[i];\n"
+    "    if (element != null) {\n"
+    "      output.write$group_or_message$($number$, element);\n"
+    "    }\n"
+    "  }\n"
+    "}\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n"
+    "  for (int i = 0; i < this.$name$.length; i++) {\n"
+    "    $type$ element = this.$name$[i];\n"
+    "    if (element != null) {\n"
+    "      size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+    "        .compute$group_or_message$Size($number$, element);\n"
+    "    }\n"
+    "  }\n"
+    "}\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
+    "    this.$name$, other.$name$)) {\n"
+    "  return false;\n"
+    "}\n");
+}
+
+void RepeatedMessageFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "result = 31 * result\n"
+    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_message_field.h

@@ -0,0 +1,96 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__
+
+#include <map>
+#include <string>
+#include <google/protobuf/compiler/javanano/javanano_field.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class MessageFieldGenerator : public FieldGenerator {
+ public:
+  explicit MessageFieldGenerator(
+      const FieldDescriptor* descriptor, const Params& params);
+  ~MessageFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageFieldGenerator);
+};
+
+class RepeatedMessageFieldGenerator : public FieldGenerator {
+ public:
+  explicit RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor,
+        const Params& params);
+  ~RepeatedMessageFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedMessageFieldGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__

src/google/protobuf/compiler/javanano/javanano_params.h

@@ -0,0 +1,240 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2010 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: wink@google.com (Wink Saville)
+
+#ifndef PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_
+#define PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_
+
+#include <map>
+#include <set>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+enum eMultipleFiles { JAVANANO_MUL_UNSET, JAVANANO_MUL_FALSE, JAVANANO_MUL_TRUE };
+
+// Parameters for used by the generators
+class Params {
+ public:
+  typedef map<string, string> NameMap;
+  typedef set<string> NameSet;
+ private:
+  string empty_;
+  string base_name_;
+  eMultipleFiles override_java_multiple_files_;
+  bool store_unknown_fields_;
+  NameMap java_packages_;
+  NameMap java_outer_classnames_;
+  NameSet java_multiple_files_;
+  bool generate_has_;
+  bool java_enum_style_;
+  bool optional_field_accessors_;
+  bool use_reference_types_for_primitives_;
+  bool generate_equals_;
+  bool ignore_services_;
+  bool parcelable_messages_;
+  bool reftypes_primitive_enums_;
+  bool generate_clear_;
+
+ public:
+  Params(const string & base_name) :
+    empty_(""),
+    base_name_(base_name),
+    override_java_multiple_files_(JAVANANO_MUL_UNSET),
+    store_unknown_fields_(false),
+    generate_has_(false),
+    java_enum_style_(false),
+    optional_field_accessors_(false),
+    use_reference_types_for_primitives_(false),
+    generate_equals_(false),
+    ignore_services_(false),
+    parcelable_messages_(false),
+    reftypes_primitive_enums_(false),
+    generate_clear_(true) {
+  }
+
+  const string& base_name() const {
+    return base_name_;
+  }
+
+  bool has_java_package(const string& file_name) const {
+    return java_packages_.find(file_name)
+                        != java_packages_.end();
+  }
+  void set_java_package(const string& file_name,
+      const string& java_package) {
+    java_packages_[file_name] = java_package;
+  }
+  const string& java_package(const string& file_name) const {
+    NameMap::const_iterator itr;
+
+    itr = java_packages_.find(file_name);
+    if  (itr == java_packages_.end()) {
+      return empty_;
+    } else {
+      return itr->second;
+    }
+  }
+  const NameMap& java_packages() {
+    return java_packages_;
+  }
+
+  bool has_java_outer_classname(const string& file_name) const {
+    return java_outer_classnames_.find(file_name)
+                        != java_outer_classnames_.end();
+  }
+  void set_java_outer_classname(const string& file_name,
+      const string& java_outer_classname) {
+    java_outer_classnames_[file_name] = java_outer_classname;
+  }
+  const string& java_outer_classname(const string& file_name) const {
+    NameMap::const_iterator itr;
+
+    itr = java_outer_classnames_.find(file_name);
+    if  (itr == java_outer_classnames_.end()) {
+      return empty_;
+    } else {
+      return itr->second;
+    }
+  }
+  const NameMap& java_outer_classnames() {
+    return java_outer_classnames_;
+  }
+
+  void set_override_java_multiple_files(bool java_multiple_files) {
+    if (java_multiple_files) {
+      override_java_multiple_files_ = JAVANANO_MUL_TRUE;
+    } else {
+      override_java_multiple_files_ = JAVANANO_MUL_FALSE;
+    }
+  }
+  void clear_override_java_multiple_files() {
+    override_java_multiple_files_ = JAVANANO_MUL_UNSET;
+  }
+
+  void set_java_multiple_files(const string& file_name, bool value) {
+    if (value) {
+      java_multiple_files_.insert(file_name);
+    } else {
+      java_multiple_files_.erase(file_name);
+    }
+  }
+  bool java_multiple_files(const string& file_name) const {
+    switch (override_java_multiple_files_) {
+      case JAVANANO_MUL_FALSE:
+        return false;
+      case JAVANANO_MUL_TRUE:
+        return true;
+      default:
+        return java_multiple_files_.find(file_name)
+                != java_multiple_files_.end();
+    }
+  }
+
+  void set_store_unknown_fields(bool value) {
+    store_unknown_fields_ = value;
+  }
+  bool store_unknown_fields() const {
+    return store_unknown_fields_;
+  }
+
+  void set_generate_has(bool value) {
+    generate_has_ = value;
+  }
+  bool generate_has() const {
+    return generate_has_;
+  }
+
+  void set_java_enum_style(bool value) {
+    java_enum_style_ = value;
+  }
+  bool java_enum_style() const {
+    return java_enum_style_;
+  }
+
+  void set_optional_field_accessors(bool value) {
+    optional_field_accessors_ = value;
+  }
+  bool optional_field_accessors() const {
+    return optional_field_accessors_;
+  }
+
+  void set_use_reference_types_for_primitives(bool value) {
+    use_reference_types_for_primitives_ = value;
+  }
+  bool use_reference_types_for_primitives() const {
+    return use_reference_types_for_primitives_;
+  }
+
+  void set_generate_equals(bool value) {
+    generate_equals_ = value;
+  }
+  bool generate_equals() const {
+    return generate_equals_;
+  }
+
+  void set_ignore_services(bool value) {
+    ignore_services_ = value;
+  }
+  bool ignore_services() const {
+    return ignore_services_;
+  }
+
+  void set_parcelable_messages(bool value) {
+    parcelable_messages_ = value;
+  }
+  bool parcelable_messages() const {
+    return parcelable_messages_;
+  }
+
+  void set_reftypes_primitive_enums(bool value) {
+    reftypes_primitive_enums_ = value;
+  }
+  bool reftypes_primitive_enums() const {
+    return reftypes_primitive_enums_;
+  }
+
+  void set_generate_clear(bool value) {
+    generate_clear_ = value;
+  }
+  bool generate_clear() const {
+    return generate_clear_;
+  }
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+#endif  // PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_

src/google/protobuf/compiler/javanano/javanano_primitive_field.cc

@@ -0,0 +1,910 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <map>
+#include <math.h>
+#include <string>
+
+#include <google/protobuf/compiler/javanano/javanano_primitive_field.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/substitute.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+using internal::WireFormat;
+using internal::WireFormatLite;
+
+namespace {
+
+bool IsReferenceType(JavaType type) {
+  switch (type) {
+    case JAVATYPE_INT    : return false;
+    case JAVATYPE_LONG   : return false;
+    case JAVATYPE_FLOAT  : return false;
+    case JAVATYPE_DOUBLE : return false;
+    case JAVATYPE_BOOLEAN: return false;
+    case JAVATYPE_STRING : return true;
+    case JAVATYPE_BYTES  : return true;
+    case JAVATYPE_ENUM   : return false;
+    case JAVATYPE_MESSAGE: return true;
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return false;
+}
+
+bool IsArrayType(JavaType type) {
+  switch (type) {
+    case JAVATYPE_INT    : return false;
+    case JAVATYPE_LONG   : return false;
+    case JAVATYPE_FLOAT  : return false;
+    case JAVATYPE_DOUBLE : return false;
+    case JAVATYPE_BOOLEAN: return false;
+    case JAVATYPE_STRING : return false;
+    case JAVATYPE_BYTES  : return true;
+    case JAVATYPE_ENUM   : return false;
+    case JAVATYPE_MESSAGE: return false;
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return false;
+}
+
+const char* GetCapitalizedType(const FieldDescriptor* field) {
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_INT32   : return "Int32"   ;
+    case FieldDescriptor::TYPE_UINT32  : return "UInt32"  ;
+    case FieldDescriptor::TYPE_SINT32  : return "SInt32"  ;
+    case FieldDescriptor::TYPE_FIXED32 : return "Fixed32" ;
+    case FieldDescriptor::TYPE_SFIXED32: return "SFixed32";
+    case FieldDescriptor::TYPE_INT64   : return "Int64"   ;
+    case FieldDescriptor::TYPE_UINT64  : return "UInt64"  ;
+    case FieldDescriptor::TYPE_SINT64  : return "SInt64"  ;
+    case FieldDescriptor::TYPE_FIXED64 : return "Fixed64" ;
+    case FieldDescriptor::TYPE_SFIXED64: return "SFixed64";
+    case FieldDescriptor::TYPE_FLOAT   : return "Float"   ;
+    case FieldDescriptor::TYPE_DOUBLE  : return "Double"  ;
+    case FieldDescriptor::TYPE_BOOL    : return "Bool"    ;
+    case FieldDescriptor::TYPE_STRING  : return "String"  ;
+    case FieldDescriptor::TYPE_BYTES   : return "Bytes"   ;
+    case FieldDescriptor::TYPE_ENUM    : return "Enum"    ;
+    case FieldDescriptor::TYPE_GROUP   : return "Group"   ;
+    case FieldDescriptor::TYPE_MESSAGE : return "Message" ;
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return NULL;
+}
+
+// For encodings with fixed sizes, returns that size in bytes.  Otherwise
+// returns -1.
+int FixedSize(FieldDescriptor::Type type) {
+  switch (type) {
+    case FieldDescriptor::TYPE_INT32   : return -1;
+    case FieldDescriptor::TYPE_INT64   : return -1;
+    case FieldDescriptor::TYPE_UINT32  : return -1;
+    case FieldDescriptor::TYPE_UINT64  : return -1;
+    case FieldDescriptor::TYPE_SINT32  : return -1;
+    case FieldDescriptor::TYPE_SINT64  : return -1;
+    case FieldDescriptor::TYPE_FIXED32 : return WireFormatLite::kFixed32Size;
+    case FieldDescriptor::TYPE_FIXED64 : return WireFormatLite::kFixed64Size;
+    case FieldDescriptor::TYPE_SFIXED32: return WireFormatLite::kSFixed32Size;
+    case FieldDescriptor::TYPE_SFIXED64: return WireFormatLite::kSFixed64Size;
+    case FieldDescriptor::TYPE_FLOAT   : return WireFormatLite::kFloatSize;
+    case FieldDescriptor::TYPE_DOUBLE  : return WireFormatLite::kDoubleSize;
+
+    case FieldDescriptor::TYPE_BOOL    : return WireFormatLite::kBoolSize;
+    case FieldDescriptor::TYPE_ENUM    : return -1;
+
+    case FieldDescriptor::TYPE_STRING  : return -1;
+    case FieldDescriptor::TYPE_BYTES   : return -1;
+    case FieldDescriptor::TYPE_GROUP   : return -1;
+    case FieldDescriptor::TYPE_MESSAGE : return -1;
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return -1;
+}
+
+// Return true if the type is a that has variable length
+// for instance String's.
+bool IsVariableLenType(JavaType type) {
+  switch (type) {
+    case JAVATYPE_INT    : return false;
+    case JAVATYPE_LONG   : return false;
+    case JAVATYPE_FLOAT  : return false;
+    case JAVATYPE_DOUBLE : return false;
+    case JAVATYPE_BOOLEAN: return false;
+    case JAVATYPE_STRING : return true;
+    case JAVATYPE_BYTES  : return true;
+    case JAVATYPE_ENUM   : return false;
+    case JAVATYPE_MESSAGE: return true;
+
+    // No default because we want the compiler to complain if any new
+    // JavaTypes are added.
+  }
+
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return false;
+}
+
+bool AllAscii(const string& text) {
+  for (int i = 0; i < text.size(); i++) {
+    if ((text[i] & 0x80) != 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void SetPrimitiveVariables(const FieldDescriptor* descriptor, const Params params,
+                           map<string, string>* variables) {
+  (*variables)["name"] =
+    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
+  (*variables)["capitalized_name"] =
+    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
+  (*variables)["number"] = SimpleItoa(descriptor->number());
+  if (params.use_reference_types_for_primitives()
+      && !descriptor->is_repeated()) {
+    (*variables)["type"] = BoxedPrimitiveTypeName(GetJavaType(descriptor));
+  } else {
+    (*variables)["type"] = PrimitiveTypeName(GetJavaType(descriptor));
+  }
+  // Deals with defaults. For C++-string types (string and bytes),
+  // we might need to have the generated code do the unicode decoding
+  // (see comments in InternalNano.java for gory details.). We would
+  // like to do this once into a static field and re-use that from
+  // then on.
+  if (descriptor->cpp_type() == FieldDescriptor::CPPTYPE_STRING &&
+      !descriptor->default_value_string().empty() &&
+      !params.use_reference_types_for_primitives()) {
+    if (descriptor->type() == FieldDescriptor::TYPE_BYTES) {
+      (*variables)["default"] = DefaultValue(params, descriptor);
+      (*variables)["default_constant"] = FieldDefaultConstantName(descriptor);
+      (*variables)["default_constant_value"] = strings::Substitute(
+          "com.google.protobuf.nano.InternalNano.bytesDefaultValue(\"$0\")",
+          CEscape(descriptor->default_value_string()));
+      (*variables)["default_copy_if_needed"] =
+          (*variables)["default"] + ".clone()";
+    } else if (AllAscii(descriptor->default_value_string())) {
+      // All chars are ASCII.  In this case directly referencing a
+      // CEscape()'d string literal works fine.
+      (*variables)["default"] =
+          "\"" + CEscape(descriptor->default_value_string()) + "\"";
+      (*variables)["default_copy_if_needed"] = (*variables)["default"];
+    } else {
+      // Strings where some chars are non-ASCII. We need to save the
+      // default value.
+      (*variables)["default"] = DefaultValue(params, descriptor);
+      (*variables)["default_constant"] = FieldDefaultConstantName(descriptor);
+      (*variables)["default_constant_value"] = strings::Substitute(
+          "com.google.protobuf.nano.InternalNano.stringDefaultValue(\"$0\")",
+          CEscape(descriptor->default_value_string()));
+      (*variables)["default_copy_if_needed"] = (*variables)["default"];
+    }
+  } else {
+    // Non-string, non-bytes field. Defaults are literals.
+    (*variables)["default"] = DefaultValue(params, descriptor);
+    (*variables)["default_copy_if_needed"] = (*variables)["default"];
+  }
+  (*variables)["boxed_type"] = BoxedPrimitiveTypeName(GetJavaType(descriptor));
+  (*variables)["capitalized_type"] = GetCapitalizedType(descriptor);
+  (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
+  (*variables)["tag_size"] = SimpleItoa(
+      WireFormat::TagSize(descriptor->number(), descriptor->type()));
+  (*variables)["non_packed_tag"] = SimpleItoa(
+      internal::WireFormatLite::MakeTag(descriptor->number(),
+          internal::WireFormat::WireTypeForFieldType(descriptor->type())));
+  int fixed_size = FixedSize(descriptor->type());
+  if (fixed_size != -1) {
+    (*variables)["fixed_size"] = SimpleItoa(fixed_size);
+  }
+  (*variables)["message_name"] = descriptor->containing_type()->name();
+  (*variables)["empty_array_name"] = EmptyArrayName(params, descriptor);
+}
+}  // namespace
+
+// ===================================================================
+
+PrimitiveFieldGenerator::
+PrimitiveFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetPrimitiveVariables(descriptor, params, &variables_);
+}
+
+PrimitiveFieldGenerator::~PrimitiveFieldGenerator() {}
+
+bool PrimitiveFieldGenerator::SavedDefaultNeeded() const {
+  return variables_.find("default_constant") != variables_.end();
+}
+
+void PrimitiveFieldGenerator::GenerateInitSavedDefaultCode(io::Printer* printer) const {
+  if (variables_.find("default_constant") != variables_.end()) {
+    printer->Print(variables_,
+      "$default_constant$ = $default_constant_value$;\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateMembers(io::Printer* printer, bool lazy_init) const {
+  if (variables_.find("default_constant") != variables_.end()) {
+    // Those primitive types that need a saved default.
+    if (lazy_init) {
+      printer->Print(variables_,
+        "private static $type$ $default_constant$;\n");
+    } else {
+      printer->Print(variables_,
+        "private static final $type$ $default_constant$ =\n"
+        "    $default_constant_value$;\n");
+    }
+  }
+
+  printer->Print(variables_,
+    "public $type$ $name$;\n");
+
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "public boolean has$capitalized_name$;\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = $default_copy_if_needed$;\n");
+
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "has$capitalized_name$ = false;\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "this.$name$ = input.read$capitalized_type$();\n");
+
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "has$capitalized_name$ = true;\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateSerializationConditional(io::Printer* printer) const {
+  if (params_.use_reference_types_for_primitives()) {
+    // For reference type mode, serialize based on equality
+    // to null.
+    printer->Print(variables_,
+      "if (this.$name$ != null) {\n");
+    return;
+  }
+  if (params_.generate_has()) {
+    printer->Print(variables_,
+      "if (has$capitalized_name$ || ");
+  } else {
+    printer->Print(variables_,
+      "if (");
+  }
+  JavaType java_type = GetJavaType(descriptor_);
+  if (IsArrayType(java_type)) {
+    printer->Print(variables_,
+      "!java.util.Arrays.equals(this.$name$, $default$)) {\n");
+  } else if (IsReferenceType(java_type)) {
+    printer->Print(variables_,
+      "!this.$name$.equals($default$)) {\n");
+  } else if (java_type == JAVATYPE_FLOAT) {
+    printer->Print(variables_,
+      "java.lang.Float.floatToIntBits(this.$name$)\n"
+      "    != java.lang.Float.floatToIntBits($default$)) {\n");
+  } else if (java_type == JAVATYPE_DOUBLE) {
+    printer->Print(variables_,
+      "java.lang.Double.doubleToLongBits(this.$name$)\n"
+      "    != java.lang.Double.doubleToLongBits($default$)) {\n");
+  } else {
+    printer->Print(variables_,
+      "this.$name$ != $default$) {\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  if (descriptor_->is_required() && !params_.generate_has()) {
+    // Always serialize a required field if we don't have the 'has' signal.
+    printer->Print(variables_,
+      "output.write$capitalized_type$($number$, this.$name$);\n");
+  } else {
+    GenerateSerializationConditional(printer);
+    printer->Print(variables_,
+      "  output.write$capitalized_type$($number$, this.$name$);\n"
+      "}\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  if (descriptor_->is_required() && !params_.generate_has()) {
+    printer->Print(variables_,
+      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "    .compute$capitalized_type$Size($number$, this.$name$);\n");
+  } else {
+    GenerateSerializationConditional(printer);
+    printer->Print(variables_,
+      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "      .compute$capitalized_type$Size($number$, this.$name$);\n"
+      "}\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  // We define equality as serialized form equality. If generate_has(),
+  // then if the field value equals the default value in both messages,
+  // but one's 'has' field is set and the other's is not, the serialized
+  // forms are different and we should return false.
+  JavaType java_type = GetJavaType(descriptor_);
+  if (java_type == JAVATYPE_BYTES) {
+    printer->Print(variables_,
+      "if (!java.util.Arrays.equals(this.$name$, other.$name$)");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "    || (java.util.Arrays.equals(this.$name$, $default$)\n"
+        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "  return false;\n"
+      "}\n");
+  } else if (java_type == JAVATYPE_STRING
+      || params_.use_reference_types_for_primitives()) {
+    printer->Print(variables_,
+      "if (this.$name$ == null) {\n"
+      "  if (other.$name$ != null) {\n"
+      "    return false;\n"
+      "  }\n"
+      "} else if (!this.$name$.equals(other.$name$)");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "    || (this.$name$.equals($default$)\n"
+        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "  return false;\n"
+      "}\n");
+  } else if (java_type == JAVATYPE_FLOAT) {
+    printer->Print(variables_,
+      "{\n"
+      "  int bits = java.lang.Float.floatToIntBits(this.$name$);\n"
+      "  if (bits != java.lang.Float.floatToIntBits(other.$name$)");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "      || (bits == java.lang.Float.floatToIntBits($default$)\n"
+        "          && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "    return false;\n"
+      "  }\n"
+      "}\n");
+  } else if (java_type == JAVATYPE_DOUBLE) {
+    printer->Print(variables_,
+      "{\n"
+      "  long bits = java.lang.Double.doubleToLongBits(this.$name$);\n"
+      "  if (bits != java.lang.Double.doubleToLongBits(other.$name$)");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "      || (bits == java.lang.Double.doubleToLongBits($default$)\n"
+        "          && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "    return false;\n"
+      "  }\n"
+      "}\n");
+  } else {
+    printer->Print(variables_,
+      "if (this.$name$ != other.$name$");
+    if (params_.generate_has()) {
+      printer->Print(variables_,
+        "\n"
+        "    || (this.$name$ == $default$\n"
+        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
+    }
+    printer->Print(") {\n"
+      "  return false;\n"
+      "}\n");
+  }
+}
+
+void PrimitiveFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  JavaType java_type = GetJavaType(descriptor_);
+  if (java_type == JAVATYPE_BYTES) {
+    printer->Print(variables_,
+      "result = 31 * result + java.util.Arrays.hashCode(this.$name$);\n");
+  } else if (java_type == JAVATYPE_STRING
+      || params_.use_reference_types_for_primitives()) {
+    printer->Print(variables_,
+      "result = 31 * result\n"
+      "    + (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
+  } else {
+    switch (java_type) {
+      // For all Java primitive types below, the hash codes match the
+      // results of BoxedType.valueOf(primitiveValue).hashCode().
+      case JAVATYPE_INT:
+        printer->Print(variables_,
+          "result = 31 * result + this.$name$;\n");
+        break;
+      case JAVATYPE_LONG:
+        printer->Print(variables_,
+          "result = 31 * result\n"
+          "    + (int) (this.$name$ ^ (this.$name$ >>> 32));\n");
+        break;
+      case JAVATYPE_FLOAT:
+        printer->Print(variables_,
+          "result = 31 * result\n"
+          "    + java.lang.Float.floatToIntBits(this.$name$);\n");
+        break;
+      case JAVATYPE_DOUBLE:
+        printer->Print(variables_,
+          "{\n"
+          "  long v = java.lang.Double.doubleToLongBits(this.$name$);\n"
+          "  result = 31 * result + (int) (v ^ (v >>> 32));\n"
+          "}\n");
+        break;
+      case JAVATYPE_BOOLEAN:
+        printer->Print(variables_,
+          "result = 31 * result + (this.$name$ ? 1231 : 1237);\n");
+        break;
+      default:
+        GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
+        break;
+    }
+  }
+}
+
+// ===================================================================
+
+AccessorPrimitiveFieldGenerator::
+AccessorPrimitiveFieldGenerator(const FieldDescriptor* descriptor,
+     const Params& params, int has_bit_index)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetPrimitiveVariables(descriptor, params, &variables_);
+  SetBitOperationVariables("has", has_bit_index, &variables_);
+}
+
+AccessorPrimitiveFieldGenerator::~AccessorPrimitiveFieldGenerator() {}
+
+bool AccessorPrimitiveFieldGenerator::SavedDefaultNeeded() const {
+  return variables_.find("default_constant") != variables_.end();
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateInitSavedDefaultCode(io::Printer* printer) const {
+  if (variables_.find("default_constant") != variables_.end()) {
+    printer->Print(variables_,
+      "$default_constant$ = $default_constant_value$;\n");
+  }
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateMembers(io::Printer* printer, bool lazy_init) const {
+  if (variables_.find("default_constant") != variables_.end()) {
+    // Those primitive types that need a saved default.
+    if (lazy_init) {
+      printer->Print(variables_,
+        "private static $type$ $default_constant$;\n");
+    } else {
+      printer->Print(variables_,
+        "private static final $type$ $default_constant$ =\n"
+        "    $default_constant_value$;\n");
+    }
+  }
+  printer->Print(variables_,
+    "private $type$ $name$_;\n"
+    "public $type$ get$capitalized_name$() {\n"
+    "  return $name$_;\n"
+    "}\n"
+    "public $message_name$ set$capitalized_name$($type$ value) {\n");
+  if (IsReferenceType(GetJavaType(descriptor_))) {
+    printer->Print(variables_,
+      "  if (value == null) {\n"
+      "    throw new java.lang.NullPointerException();\n"
+      "  }\n");
+  }
+  printer->Print(variables_,
+    "  $name$_ = value;\n"
+    "  $set_has$;\n"
+    "  return this;\n"
+    "}\n"
+    "public boolean has$capitalized_name$() {\n"
+    "  return $get_has$;\n"
+    "}\n"
+    "public $message_name$ clear$capitalized_name$() {\n"
+    "  $name$_ = $default_copy_if_needed$;\n"
+    "  $clear_has$;\n"
+    "  return this;\n"
+    "}\n");
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$_ = $default_copy_if_needed$;\n");
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$_ = input.read$capitalized_type$();\n"
+    "$set_has$;\n");
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if ($get_has$) {\n"
+    "  output.write$capitalized_type$($number$, $name$_);\n"
+    "}\n");
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if ($get_has$) {\n"
+    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+    "      .compute$capitalized_type$Size($number$, $name$_);\n"
+    "}\n");
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  switch (GetJavaType(descriptor_)) {
+    // For all Java primitive types below, the equality checks match the
+    // results of BoxedType.valueOf(primitiveValue).equals(otherValue).
+    case JAVATYPE_FLOAT:
+      printer->Print(variables_,
+        "if ($different_has$\n"
+        "    || java.lang.Float.floatToIntBits($name$_)\n"
+        "        != java.lang.Float.floatToIntBits(other.$name$_)) {\n"
+        "  return false;\n"
+        "}\n");
+      break;
+    case JAVATYPE_DOUBLE:
+      printer->Print(variables_,
+        "if ($different_has$\n"
+        "    || java.lang.Double.doubleToLongBits($name$_)\n"
+        "        != java.lang.Double.doubleToLongBits(other.$name$_)) {\n"
+        "  return false;\n"
+        "}\n");
+      break;
+    case JAVATYPE_INT:
+    case JAVATYPE_LONG:
+    case JAVATYPE_BOOLEAN:
+      printer->Print(variables_,
+        "if ($different_has$\n"
+        "    || $name$_ != other.$name$_) {\n"
+        "  return false;\n"
+        "}\n");
+      break;
+    case JAVATYPE_STRING:
+      // Accessor style would guarantee $name$_ non-null
+      printer->Print(variables_,
+        "if ($different_has$\n"
+        "    || !$name$_.equals(other.$name$_)) {\n"
+        "  return false;\n"
+        "}\n");
+      break;
+    case JAVATYPE_BYTES:
+      // Accessor style would guarantee $name$_ non-null
+      printer->Print(variables_,
+        "if ($different_has$\n"
+        "    || !java.util.Arrays.equals($name$_, other.$name$_)) {\n"
+        "  return false;\n"
+        "}\n");
+      break;
+    default:
+      GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
+      break;
+  }
+}
+
+void AccessorPrimitiveFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  switch (GetJavaType(descriptor_)) {
+    // For all Java primitive types below, the hash codes match the
+    // results of BoxedType.valueOf(primitiveValue).hashCode().
+    case JAVATYPE_INT:
+      printer->Print(variables_,
+        "result = 31 * result + $name$_;\n");
+      break;
+    case JAVATYPE_LONG:
+      printer->Print(variables_,
+        "result = 31 * result + (int) ($name$_ ^ ($name$_ >>> 32));\n");
+      break;
+    case JAVATYPE_FLOAT:
+      printer->Print(variables_,
+        "result = 31 * result +\n"
+        "    java.lang.Float.floatToIntBits($name$_);\n");
+      break;
+    case JAVATYPE_DOUBLE:
+      printer->Print(variables_,
+        "{\n"
+        "  long v = java.lang.Double.doubleToLongBits($name$_);\n"
+        "  result = 31 * result + (int) (v ^ (v >>> 32));\n"
+        "}\n");
+      break;
+    case JAVATYPE_BOOLEAN:
+      printer->Print(variables_,
+        "result = 31 * result + ($name$_ ? 1231 : 1237);\n");
+      break;
+    case JAVATYPE_STRING:
+      // Accessor style would guarantee $name$_ non-null
+      printer->Print(variables_,
+        "result = 31 * result + $name$_.hashCode();\n");
+      break;
+    case JAVATYPE_BYTES:
+      // Accessor style would guarantee $name$_ non-null
+      printer->Print(variables_,
+        "result = 31 * result + java.util.Arrays.hashCode($name$_);\n");
+      break;
+    default:
+      GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
+      break;
+  }
+}
+
+// ===================================================================
+
+RepeatedPrimitiveFieldGenerator::
+RepeatedPrimitiveFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : FieldGenerator(params), descriptor_(descriptor) {
+  SetPrimitiveVariables(descriptor, params, &variables_);
+}
+
+RepeatedPrimitiveFieldGenerator::~RepeatedPrimitiveFieldGenerator() {}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateMembers(io::Printer* printer, bool /*unused init_defaults*/) const {
+  printer->Print(variables_,
+    "public $type$[] $name$;\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateClearCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = $default$;\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  // First, figure out the length of the array, then parse.
+  printer->Print(variables_,
+    "int arrayLength = com.google.protobuf.nano.WireFormatNano\n"
+    "    .getRepeatedFieldArrayLength(input, $non_packed_tag$);\n"
+    "int i = this.$name$ == null ? 0 : this.$name$.length;\n");
+
+  if (GetJavaType(descriptor_) == JAVATYPE_BYTES) {
+    printer->Print(variables_,
+      "byte[][] newArray = new byte[i + arrayLength][];\n");
+  } else {
+    printer->Print(variables_,
+      "$type$[] newArray = new $type$[i + arrayLength];\n");
+  }
+  printer->Print(variables_,
+    "if (i != 0) {\n"
+    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
+    "}\n"
+    "for (; i < newArray.length - 1; i++) {\n"
+    "  newArray[i] = input.read$capitalized_type$();\n"
+    "  input.readTag();\n"
+    "}\n"
+    "// Last one without readTag.\n"
+    "newArray[i] = input.read$capitalized_type$();\n"
+    "this.$name$ = newArray;\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateMergingCodeFromPacked(io::Printer* printer) const {
+  printer->Print(
+    "int length = input.readRawVarint32();\n"
+    "int limit = input.pushLimit(length);\n");
+
+  // If we know the elements will all be of the same size, the arrayLength
+  // can be calculated much more easily. However, FixedSize() returns 1 for
+  // repeated bool fields, which are guaranteed to have the fixed size of
+  // 1 byte per value only if we control the output. On the wire they can
+  // legally appear as variable-size integers, so we need to use the slow
+  // way for repeated bool fields.
+  if (descriptor_->type() == FieldDescriptor::TYPE_BOOL
+      || FixedSize(descriptor_->type()) == -1) {
+    printer->Print(variables_,
+      "// First pass to compute array length.\n"
+      "int arrayLength = 0;\n"
+      "int startPos = input.getPosition();\n"
+      "while (input.getBytesUntilLimit() > 0) {\n"
+      "  input.read$capitalized_type$();\n"
+      "  arrayLength++;\n"
+      "}\n"
+      "input.rewindToPosition(startPos);\n");
+  } else {
+    printer->Print(variables_,
+      "int arrayLength = length / $fixed_size$;\n");
+  }
+
+  printer->Print(variables_,
+    "int i = this.$name$ == null ? 0 : this.$name$.length;\n"
+    "$type$[] newArray = new $type$[i + arrayLength];\n"
+    "if (i != 0) {\n"
+    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
+    "}\n"
+    "for (; i < newArray.length; i++) {\n"
+    "  newArray[i] = input.read$capitalized_type$();\n"
+    "}\n"
+    "this.$name$ = newArray;\n"
+    "input.popLimit(limit);\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateRepeatedDataSizeCode(io::Printer* printer) const {
+  // Creates a variable dataSize and puts the serialized size in there.
+  // If the element type is a Java reference type, also generates
+  // dataCount which stores the number of non-null elements in the field.
+  if (IsReferenceType(GetJavaType(descriptor_))) {
+    printer->Print(variables_,
+      "int dataCount = 0;\n"
+      "int dataSize = 0;\n"
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  $type$ element = this.$name$[i];\n"
+      "  if (element != null) {\n"
+      "    dataCount++;\n"
+      "    dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "        .compute$capitalized_type$SizeNoTag(element);\n"
+      "  }\n"
+      "}\n");
+  } else if (FixedSize(descriptor_->type()) == -1) {
+    printer->Print(variables_,
+      "int dataSize = 0;\n"
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  $type$ element = this.$name$[i];\n"
+      "  dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "      .compute$capitalized_type$SizeNoTag(element);\n"
+      "}\n");
+  } else {
+    printer->Print(variables_,
+      "int dataSize = $fixed_size$ * this.$name$.length;\n");
+  }
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n");
+  printer->Indent();
+
+  if (descriptor_->is_packable() && descriptor_->options().packed()) {
+    GenerateRepeatedDataSizeCode(printer);
+    printer->Print(variables_,
+      "output.writeRawVarint32($tag$);\n"
+      "output.writeRawVarint32(dataSize);\n"
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  output.write$capitalized_type$NoTag(this.$name$[i]);\n"
+      "}\n");
+  } else if (IsReferenceType(GetJavaType(descriptor_))) {
+    printer->Print(variables_,
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  $type$ element = this.$name$[i];\n"
+      "  if (element != null) {\n"
+      "    output.write$capitalized_type$($number$, element);\n"
+      "  }\n"
+      "}\n");
+  } else {
+    printer->Print(variables_,
+      "for (int i = 0; i < this.$name$.length; i++) {\n"
+      "  output.write$capitalized_type$($number$, this.$name$[i]);\n"
+      "}\n");
+  }
+
+  printer->Outdent();
+  printer->Print("}\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (this.$name$ != null && this.$name$.length > 0) {\n");
+  printer->Indent();
+
+  GenerateRepeatedDataSizeCode(printer);
+
+  printer->Print(
+    "size += dataSize;\n");
+  if (descriptor_->is_packable() && descriptor_->options().packed()) {
+    printer->Print(variables_,
+      "size += $tag_size$;\n"
+      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
+      "    .computeRawVarint32Size(dataSize);\n");
+  } else if (IsReferenceType(GetJavaType(descriptor_))) {
+    printer->Print(variables_,
+      "size += $tag_size$ * dataCount;\n");
+  } else {
+    printer->Print(variables_,
+      "size += $tag_size$ * this.$name$.length;\n");
+  }
+
+  printer->Outdent();
+
+  printer->Print(
+    "}\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
+    "    this.$name$, other.$name$)) {\n"
+    "  return false;\n"
+    "}\n");
+}
+
+void RepeatedPrimitiveFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "result = 31 * result\n"
+    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google

src/google/protobuf/compiler/javanano/javanano_primitive_field.h

@@ -0,0 +1,126 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__
+
+#include <map>
+#include <string>
+#include <google/protobuf/compiler/javanano/javanano_field.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+class PrimitiveFieldGenerator : public FieldGenerator {
+ public:
+  explicit PrimitiveFieldGenerator(
+      const FieldDescriptor* descriptor, const Params &params);
+  ~PrimitiveFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  bool SavedDefaultNeeded() const;
+  void GenerateInitSavedDefaultCode(io::Printer* printer) const;
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  void GenerateSerializationConditional(io::Printer* printer) const;
+
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveFieldGenerator);
+};
+
+class AccessorPrimitiveFieldGenerator : public FieldGenerator {
+ public:
+  explicit AccessorPrimitiveFieldGenerator(const FieldDescriptor* descriptor,
+      const Params &params, int has_bit_index);
+  ~AccessorPrimitiveFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  bool SavedDefaultNeeded() const;
+  void GenerateInitSavedDefaultCode(io::Printer* printer) const;
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(AccessorPrimitiveFieldGenerator);
+};
+
+class RepeatedPrimitiveFieldGenerator : public FieldGenerator {
+ public:
+  explicit RepeatedPrimitiveFieldGenerator(const FieldDescriptor* descriptor, const Params& params);
+  ~RepeatedPrimitiveFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
+  void GenerateClearCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateMergingCodeFromPacked(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
+
+ private:
+  void GenerateRepeatedDataSizeCode(io::Printer* printer) const;
+
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedPrimitiveFieldGenerator);
+};
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__