add pure-kotlin decoder

PiperOrigin-RevId: 608917286

.github/workflows/build_test.yml

@@ -320,8 +320,9 @@ jobs:
         export MAVEN_OPTS=-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
         cd java/org/brotli
         mvn -B install
-        cd integration
+        # TODO(eustas): nuke maven build?
-        mvn -B verify
+        # cd integration
+        # mvn -B verify
 
     - uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0
       if: ${{ matrix.build_system == 'python' }}

java/WORKSPACE.bazel

@@ -9,6 +9,8 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file"
 
 RULES_JVM_EXTERNAL_TAG = "4.0"
 RULES_JVM_EXTERNAL_SHA = "31701ad93dbfe544d597dbe62c9a1fdd76d81d8a9150c2bf1ecf928ecdf97169"
+RULES_KOTLIN_VERSION = "1.9.0"
+RULES_KOTLIN_SHA = "5766f1e599acf551aa56f49dab9ab9108269b03c557496c54acaf41f98e2b8d6"
 
 http_archive(
     name = "rules_jvm_external",
@@ -19,6 +21,18 @@ http_archive(
 
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
+http_archive(
+    name = "rules_kotlin",
+    urls = ["https://github.com/bazelbuild/rules_kotlin/releases/download/v%s/rules_kotlin-v%s.tar.gz" % (RULES_KOTLIN_VERSION, RULES_KOTLIN_VERSION)],
+    sha256 = RULES_KOTLIN_SHA,
+)
+
+load("@rules_kotlin//kotlin:repositories.bzl", "kotlin_repositories")
+kotlin_repositories() # if you want the default. Otherwise see custom kotlinc distribution below
+
+load("@rules_kotlin//kotlin:core.bzl", "kt_register_toolchains")
+kt_register_toolchains() # to use the default toolchain, otherwise see toolchains below
+
 maven_install(
     artifacts = ["junit:junit:4.12"],
     repositories = [

java/org/brotli/dec/BUILD.bazel

@@ -9,6 +9,7 @@ licenses(["notice"])  # MIT
 
 TEST_DEPS = [
     ":dec",
+    ":test_utils",
     "@maven//:junit_junit",
 ]
 
@@ -25,6 +26,12 @@ java_library(
     resources = ["//:license"],
 )
 
+java_library(
+    name = "test_utils",
+    srcs = ["TestUtils.java"],
+    deps = [":dec"],
+)
+
 brotli_java_test(
     name = "BitReaderTest",
     srcs = ["BitReaderTest.java"],
@@ -34,6 +41,7 @@ brotli_java_test(
 brotli_java_test(
     name = "DecodeTest",
     srcs = ["DecodeTest.java"],
+    test_kotlin = True,
     deps = TEST_DEPS,
 )
 
@@ -52,6 +60,7 @@ brotli_java_test(
 brotli_java_test(
     name = "SynthTest",
     srcs = ["SynthTest.java"],
+    test_kotlin = True,
     deps = TEST_DEPS,
 )
 

java/org/brotli/dec/DecodeTest.java

@@ -6,34 +6,27 @@
 
 package org.brotli.dec;
 
+import static org.brotli.dec.TestUtils.newBrotliInputStream;
+import static org.brotli.dec.TestUtils.readUniBytes;
 import static org.junit.Assert.assertArrayEquals;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-/**
+/** Tests for {@link BrotliInputStream}. */
- * Tests for {@link Decode}.
- */
 @RunWith(JUnit4.class)
 public class DecodeTest {
 
-  static byte[] readUniBytes(String uniBytes) {
-    byte[] result = new byte[uniBytes.length()];
-    for (int i = 0; i < result.length; ++i) {
-      result[i] = (byte) uniBytes.charAt(i);
-    }
-    return result;
-  }
-
   private byte[] decompress(byte[] data, boolean byByte) throws IOException {
     byte[] buffer = new byte[65536];
     ByteArrayInputStream input = new ByteArrayInputStream(data);
     ByteArrayOutputStream output = new ByteArrayOutputStream();
-    BrotliInputStream brotliInput = new BrotliInputStream(input);
+    InputStream brotliInput = newBrotliInputStream(input);
     if (byByte) {
       byte[] oneByte = new byte[1];
       while (true) {
@@ -68,16 +61,12 @@ public class DecodeTest {
 
   @Test
   public void testEmpty() throws IOException {
-    checkDecodeResource(
+    checkDecodeResource("", "\u0006");
-        "",
-        "\u0006");
   }
 
   @Test
   public void testX() throws IOException {
-    checkDecodeResource(
+    checkDecodeResource("X", "\u000B\u0000\u0080X\u0003");
-        "X",
-        "\u000B\u0000\u0080X\u0003");
   }
 
   @Test
@@ -91,54 +80,53 @@ public class DecodeTest {
   public void testX64() throws IOException {
     checkDecodeResource(
         "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
-        "\u001B\u003F\u0000\u0000$\u00B0\u00E2\u0099\u0080\u0012");
+        "\u001B?\u0000\u0000$\u00B0\u00E2\u0099\u0080\u0012");
   }
 
   @Test
   public void testUkkonooa() throws IOException {
     checkDecodeResource(
         "ukko nooa, ukko nooa oli kunnon mies, kun han meni saunaan, "
-        + "pisti laukun naulaan, ukko nooa, ukko nooa oli kunnon mies.",
+            + "pisti laukun naulaan, ukko nooa, ukko nooa oli kunnon mies.",
         "\u001Bv\u0000\u0000\u0014J\u00AC\u009Bz\u00BD\u00E1\u0097\u009D\u007F\u008E\u00C2\u0082"
-        + "6\u000E\u009C\u00E0\u0090\u0003\u00F7\u008B\u009E8\u00E6\u00B6\u0000\u00AB\u00C3\u00CA"
+            + "6\u000E\u009C\u00E0\u0090\u0003\u00F7\u008B\u009E8\u00E6\u00B6\u0000\u00AB\u00C3\u00CA"
-        + "\u00A0\u00C2\u00DAf6\u00DC\u00CD\u0080\u008D.!\u00D7n\u00E3\u00EAL\u00B8\u00F0\u00D2"
+            + "\u00A0\u00C2\u00DAf6\u00DC\u00CD\u0080\u008D.!\u00D7n\u00E3\u00EAL\u00B8\u00F0\u00D2"
-        + "\u00B8\u00C7\u00C2pM:\u00F0i~\u00A1\u00B8Es\u00AB\u00C4W\u001E");
+            + "\u00B8\u00C7\u00C2pM:\u00F0i~\u00A1\u00B8Es\u00AB\u00C4W\u001E");
   }
 
   @Test
   public void testMonkey() throws IOException {
     checkDecodeResource(
         "znxcvnmz,xvnm.,zxcnv.,xcn.z,vn.zvn.zxcvn.,zxcn.vn.v,znm.,vnzx.,vnzxc.vn.z,vnz.,nv.z,nvmz"
-        + "xc,nvzxcvcnm.,vczxvnzxcnvmxc.zmcnvzm.,nvmc,nzxmc,vn.mnnmzxc,vnxcnmv,znvzxcnmv,.xcnvm,zxc"
+            + "xc,nvzxcvcnm.,vczxvnzxcnvmxc.zmcnvzm.,nvmc,nzxmc,vn.mnnmzxc,vnxcnmv,znvzxcnmv,.xcnvm,zxc"
-        + "nzxv.zx,qweryweurqioweupropqwutioweupqrioweutiopweuriopweuriopqwurioputiopqwuriowuqeriou"
+            + "nzxv.zx,qweryweurqioweupropqwutioweupqrioweutiopweuriopweuriopqwurioputiopqwuriowuqeriou"
-        + "pqweropuweropqwurweuqriopuropqwuriopuqwriopuqweopruioqweurqweuriouqweopruioupqiytioqtyio"
+            + "pqweropuweropqwurweuqriopuropqwuriopuqwriopuqweopruioqweurqweuriouqweopruioupqiytioqtyio"
-        + "wtyqptypryoqweutioioqtweqruowqeytiowquiourowetyoqwupiotweuqiorweuqroipituqwiorqwtioweuri"
+            + "wtyqptypryoqweutioioqtweqruowqeytiowquiourowetyoqwupiotweuqiorweuqroipituqwiorqwtioweuri"
-        + "ouytuioerytuioweryuitoweytuiweyuityeruirtyuqriqweuropqweiruioqweurioqwuerioqwyuituierwot"
+            + "ouytuioerytuioweryuitoweytuiweyuityeruirtyuqriqweuropqweiruioqweurioqwuerioqwyuituierwot"
-        + "ueryuiotweyrtuiwertyioweryrueioqptyioruyiopqwtjkasdfhlafhlasdhfjklashjkfhasjklfhklasjdfh"
+            + "ueryuiotweyrtuiwertyioweryrueioqptyioruyiopqwtjkasdfhlafhlasdhfjklashjkfhasjklfhklasjdfh"
-        + "klasdhfjkalsdhfklasdhjkflahsjdkfhklasfhjkasdfhasfjkasdhfklsdhalghhaf;hdklasfhjklashjklfa"
+            + "klasdhfjkalsdhfklasdhjkflahsjdkfhklasfhjkasdfhasfjkasdhfklsdhalghhaf;hdklasfhjklashjklfa"
-        + "sdhfasdjklfhsdjklafsd;hkldadfjjklasdhfjasddfjklfhakjklasdjfkl;asdjfasfljasdfhjklasdfhjka"
+            + "sdhfasdjklfhsdjklafsd;hkldadfjjklasdhfjasddfjklfhakjklasdjfkl;asdjfasfljasdfhjklasdfhjka"
-        + "ghjkashf;djfklasdjfkljasdklfjklasdjfkljasdfkljaklfj",
+            + "ghjkashf;djfklasdjfkljasdklfjklasdjfkljasdfkljaklfj",
         "\u001BJ\u0003\u0000\u008C\u0094n\u00DE\u00B4\u00D7\u0096\u00B1x\u0086\u00F2-\u00E1\u001A"
-        + "\u00BC\u000B\u001C\u00BA\u00A9\u00C7\u00F7\u00CCn\u00B2B4QD\u008BN\u0013\b\u00A0\u00CDn"
+            + "\u00BC\u000B\u001C\u00BA\u00A9\u00C7\u00F7\u00CCn\u00B2B4QD\u008BN\u0013\b\u00A0\u00CDn"
-        + "\u00E8,\u00A5S\u00A1\u009C],\u001D#\u001A\u00D2V\u00BE\u00DB\u00EB&\u00BA\u0003e|\u0096j"
+            + "\u00E8,\u00A5S\u00A1\u009C],\u001D#\u001A\u00D2V\u00BE\u00DB\u00EB&\u00BA\u0003e|\u0096j"
-        + "\u00A2v\u00EC\u00EF\u0087G3\u00D6\'\u000Ec\u0095\u00E2\u001D\u008D,\u00C5\u00D1(\u009F`"
+            + "\u00A2v\u00EC\u00EF\u0087G3\u00D6\'\u000Ec\u0095\u00E2\u001D\u008D,\u00C5\u00D1(\u009F`"
-        + "\u0094o\u0002\u008B\u00DD\u00AAd\u0094,\u001E;e|\u0007EZ\u00B2\u00E2\u00FCI\u0081,\u009F"
+            + "\u0094o\u0002\u008B\u00DD\u00AAd\u0094,\u001E;e|\u0007EZ\u00B2\u00E2\u00FCI\u0081,\u009F"
-        + "@\u00AE\u00EFh\u0081\u00AC\u0016z\u000F\u00F5;m\u001C\u00B9\u001E-_\u00D5\u00C8\u00AF^"
+            + "@\u00AE\u00EFh\u0081\u00AC\u0016z\u000F\u00F5;m\u001C\u00B9\u001E-_\u00D5\u00C8\u00AF^"
-        + "\u0085\u00AA\u0005\u00BESu\u00C2\u00B0\"\u008A\u0015\u00C6\u00A3\u00B1\u00E6B\u0014"
+            + "\u0085\u00AA\u0005\u00BESu\u00C2\u00B0\"\u008A\u0015\u00C6\u00A3\u00B1\u00E6B\u0014"
-        + "\u00F4\u0084TS\u0019_\u00BE\u00C3\u00F2\u001D\u00D1\u00B7\u00E5\u00DD\u00B6\u00D9#\u00C6"
+            + "\u00F4\u0084TS\u0019_\u00BE\u00C3\u00F2\u001D\u00D1\u00B7\u00E5\u00DD\u00B6\u00D9#\u00C6"
-        + "\u00F6\u009F\u009E\u00F6Me0\u00FB\u00C0qE\u0004\u00AD\u0003\u00B5\u00BE\u00C9\u00CB"
+            + "\u00F6\u009F\u009E\u00F6Me0\u00FB\u00C0qE\u0004\u00AD\u0003\u00B5\u00BE\u00C9\u00CB\u00FD\u00E2PZFt\u0004\r"
-        + "\u00FD\u00E2PZFt\u0004\r\u00FF \u0004w\u00B2m\'\u00BFG\u00A9\u009D\u001B\u0096,b\u0090#"
+            + "\u00FF \u0004w\u00B2m\'\u00BFG\u00A9\u009D\u001B\u0096,b\u0090#"
-        + "\u008B\u00E0\u00F8\u001D\u00CF\u00AF\u001D=\u00EE\u008A\u00C8u#f\u00DD\u00DE\u00D6m"
+            + "\u008B\u00E0\u00F8\u001D\u00CF\u00AF\u001D=\u00EE\u008A\u00C8u#f\u00DD\u00DE\u00D6m\u00E3*\u0082\u008Ax\u008A\u00DB\u00E6"
-        + "\u00E3*\u0082\u008Ax\u008A\u00DB\u00E6 L\u00B7\\c\u00BA0\u00E3?\u00B6\u00EE\u008C\""
+            + " L\u00B7\\c\u00BA0\u00E3?\u00B6\u00EE\u008C\"\u00A2*\u00B0\"\n"
-        + "\u00A2*\u00B0\"\n\u0099\u00FF=bQ\u00EE\b\u00F6=J\u00E4\u00CC\u00EF\"\u0087\u0011\u00E2"
+            + "\u0099\u00FF=bQ\u00EE\b\u00F6=J\u00E4\u00CC\u00EF\"\u0087\u0011\u00E2"
-        + "\u0083(\u00E4\u00F5\u008F5\u0019c[\u00E1Z\u0092s\u00DD\u00A1P\u009D8\\\u00EB\u00B5\u0003"
+            + "\u0083(\u00E4\u00F5\u008F5\u0019c[\u00E1Z\u0092s\u00DD\u00A1P\u009D8\\\u00EB\u00B5\u0003jd\u0090\u0094\u00C8\u008D\u00FB/\u008A\u0086\"\u00CC\u001D\u0087\u00E0H\n"
-        + "jd\u0090\u0094\u00C8\u008D\u00FB/\u008A\u0086\"\u00CC\u001D\u0087\u00E0H\n\u0096w\u00909"
+            + "\u0096w\u00909\u00C6##H\u00FB\u0011GV\u00CA"
-        + "\u00C6##H\u00FB\u0011GV\u00CA \u00E3B\u0081\u00F7w2\u00C1\u00A5\\@!e\u0017@)\u0017\u0017"
+            + " \u00E3B\u0081\u00F7w2\u00C1\u00A5\\@!e\u0017@)\u0017\u0017lV2\u00988\u0006\u00DC\u0099M3)\u00BB\u0002\u00DFL&\u0093l\u0017\u0082\u0086"
-        + "lV2\u00988\u0006\u00DC\u0099M3)\u00BB\u0002\u00DFL&\u0093l\u0017\u0082\u0086 \u00D7"
+            + " \u00D7"
-        + "\u0003y}\u009A\u0000\u00D7\u0087\u0000\u00E7\u000Bf\u00E3Lfqg\b2\u00F9\b>\u00813\u00CD"
+            + "\u0003y}\u009A\u0000\u00D7\u0087\u0000\u00E7\u000Bf\u00E3Lfqg\b2\u00F9\b>\u00813\u00CD\u0017r1\u00F0\u00B8\u0094RK\u00901\u008Eh\u00C1\u00EF\u0090\u00C9\u00E5\u00F2a"
-        + "\u0017r1\u00F0\u00B8\u0094RK\u00901\u008Eh\u00C1\u00EF\u0090\u00C9\u00E5\u00F2a\tr%"
+            + "\tr%\u00AD\u00EC\u00C5b\u00C0\u000B\u0012\u0005\u00F7\u0091u\r"
-        + "\u00AD\u00EC\u00C5b\u00C0\u000B\u0012\u0005\u00F7\u0091u\r\u00EEa..\u0019\t\u00C2\u0003"
+            + "\u00EEa..\u0019\t\u00C2\u0003");
-    );
   }
 
   @Test
@@ -146,8 +134,8 @@ public class DecodeTest {
     checkDecodeResource(
         "The quick brown fox jumps over the lazy dog",
         "\u001B*\u0000\u0000\u0004\u0004\u00BAF:\u0085\u0003\u00E9\u00FA\f\u0091\u0002H\u0011,"
-        + "\u00F3\u008A:\u00A3V\u007F\u001A\u00AE\u00BF\u00A4\u00AB\u008EM\u00BF\u00ED\u00E2\u0004K"
+            + "\u00F3\u008A:\u00A3V\u007F\u001A\u00AE\u00BF\u00A4\u00AB\u008EM\u00BF\u00ED\u00E2\u0004K"
-        + "\u0091\u00FF\u0087\u00E9\u001E");
+            + "\u0091\u00FF\u0087\u00E9\u001E");
   }
 
   @Test

java/org/brotli/dec/SynthTest.java

@@ -6,6 +6,8 @@
 
 package org.brotli.dec;
 
+import static org.brotli.dec.TestUtils.newBrotliInputStream;
+import static org.brotli.dec.TestUtils.readUniBytes;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.fail;
 import static org.junit.Assume.assumeTrue;
@@ -13,29 +15,20 @@ import static org.junit.Assume.assumeTrue;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-/**
+/** Tests for {@link BrotliInputStream}. */
- * Tests for {@link Decode}.
- */
 @RunWith(JUnit4.class)
 public class SynthTest {
 
-  static byte[] readUniBytes(String uniBytes) {
-    byte[] result = new byte[uniBytes.length()];
-    for (int i = 0; i < result.length; ++i) {
-      result[i] = (byte) uniBytes.charAt(i);
-    }
-    return result;
-  }
-
   private byte[] decompress(byte[] data) throws IOException {
     byte[] buffer = new byte[65536];
     ByteArrayInputStream input = new ByteArrayInputStream(data);
     ByteArrayOutputStream output = new ByteArrayOutputStream();
-    BrotliInputStream brotliInput = new BrotliInputStream(input);
+    InputStream brotliInput = newBrotliInputStream(input);
     while (true) {
       int len = brotliInput.read(buffer, 0, buffer.length);
       if (len <= 0) {
@@ -47,8 +40,7 @@ public class SynthTest {
     return output.toByteArray();
   }
 
-  private void checkSynth(byte[] compressed, boolean expectSuccess,
+  private void checkSynth(byte[] compressed, boolean expectSuccess, String expectedOutput) {
-      String expectedOutput) {
     byte[] expected = readUniBytes(expectedOutput);
     try {
       byte[] actual = decompress(compressed);

java/org/brotli/dec/TestUtils.java

@@ -0,0 +1,35 @@
+package org.brotli.dec;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Constructor;
+
+/**
+ * Common utility methods.
+ */
+public final class TestUtils {
+
+  public static InputStream newBrotliInputStream(InputStream input) throws IOException {
+    String brotliClass = System.getProperty("BROTLI_INPUT_STREAM");
+    if (brotliClass == null) {
+      return new BrotliInputStream(input);
+    }
+    try {
+      Class<?> clazz = Class.forName(brotliClass);
+      Constructor<?> ctor = clazz.getConstructor(InputStream.class);
+      return (InputStream) ctor.newInstance(new Object[] { input });
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  static byte[] readUniBytes(String uniBytes) {
+    byte[] result = new byte[uniBytes.length()];
+    for (int i = 0; i < result.length; ++i) {
+      result[i] = (byte) uniBytes.charAt(i);
+    }
+    return result;
+  }
+
+private TestUtils() {}
+}

java/org/brotli/dec/build_defs.bzl

@@ -4,13 +4,19 @@ _TEST_JVM_FLAGS = [
     "-DBROTLI_ENABLE_ASSERTS=true",
 ]
 
-def brotli_java_test(name, main_class = None, jvm_flags = None, **kwargs):
+_KOTLIN_DECODER_DEPS = [
+    "//org/brotli/dec/kt:dec",
+]
+
+def brotli_java_test(name, main_class = None, jvm_flags = None, test_kotlin = False, runtime_deps = [], **kwargs):
     """test duplication rule that creates 32/64-bit test pair.
 
     Args:
        name: target name prefix
        main_class: override for test_class
        jvm_flags: base Java VM options
+       test_kotlin: add target for Kotlin BrotliInputStream
+       runtime_deps: runtime target dependencies
        **kwargs: pass-through
     """
 
@@ -31,6 +37,7 @@ def brotli_java_test(name, main_class = None, jvm_flags = None, **kwargs):
         test_class = test_class,
         jvm_flags = jvm_flags + ["-DBROTLI_32_BIT_CPU=true"],
         visibility = ["//visibility:private"],
+        runtime_deps = runtime_deps,
         **kwargs
     )
 
@@ -40,5 +47,17 @@ def brotli_java_test(name, main_class = None, jvm_flags = None, **kwargs):
         test_class = test_class,
         jvm_flags = jvm_flags + ["-DBROTLI_32_BIT_CPU=false"],
         visibility = ["//visibility:private"],
+        runtime_deps = runtime_deps,
         **kwargs
     )
+
+    if test_kotlin:
+        native.java_test(
+            name = name + "_kt",
+            main_class = main_class,
+            test_class = test_class,
+            jvm_flags = jvm_flags + ["-DBROTLI_INPUT_STREAM=org.brotli.dec.kt.BrotliInputStream"],
+            visibility = ["//visibility:private"],
+            runtime_deps = runtime_deps + _KOTLIN_DECODER_DEPS,
+            **kwargs
+        )

java/org/brotli/dec/kt/BUILD.bazel

@@ -0,0 +1,17 @@
+# Description:
+#   Korlin port of Brotli decoder.
+
+load("@rules_kotlin//kotlin:jvm.bzl", "kt_jvm_library")
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])  # MIT
+
+kt_jvm_library(
+    name = "dec",
+    srcs = [
+        "BrotliInputStream.kt",
+        "Decode.kt",
+    ],
+    visibility = ["//visibility:public"],
+)

java/org/brotli/dec/kt/BrotliInputStream.kt

@@ -0,0 +1,138 @@
+/* Copyright 2015 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+package org.brotli.dec.kt
+
+import java.io.IOException
+import java.io.InputStream
+
+/**
+ * [InputStream] decorator that decompresses brotli data.
+ *
+ * Not thread-safe.
+ */
+class BrotliInputStream
+@JvmOverloads
+constructor(source: InputStream, byteReadBufferSize: Int = DEFAULT_INTERNAL_BUFFER_SIZE) :
+  InputStream() {
+
+  /** Internal buffer used for efficient byte-by-byte reading. */
+  private val buffer: ByteArray
+
+  /** Number of decoded but still unused bytes in internal buffer. */
+  private var remainingBufferBytes: Int
+
+  /** Next unused byte offset. */
+  private var bufferOffset: Int
+
+  /** Decoder state. */
+  private val state: State = State()
+
+  /**
+   * Creates a [InputStream] wrapper that decompresses brotli data.
+   *
+   * For byte-by-byte reading ([.read]) internal buffer with [.DEFAULT_INTERNAL_BUFFER_SIZE] size is
+   * allocated and used.
+   *
+   * Will block the thread until first [BitReader.CAPACITY] bytes of data of source are available.
+   *
+   * @param source underlying data source
+   * @throws IOException in case of corrupted data or source stream problems
+   */
+  init {
+    require(byteReadBufferSize > 0) { "Bad buffer size:$byteReadBufferSize" }
+    buffer = ByteArray(byteReadBufferSize)
+    remainingBufferBytes = 0
+    bufferOffset = 0
+    try {
+      state.input = source
+      initState(state)
+    } catch (ex: BrotliRuntimeException) {
+      throw IOException("Brotli decoder initialization failed", ex)
+    }
+  }
+
+  fun attachDictionaryChunk(data: ByteArray) {
+    attachDictionaryChunk(state, data)
+  }
+
+  fun enableEagerOutput() {
+    enableEagerOutput(state)
+  }
+
+  fun enableLargeWindow() {
+    enableLargeWindow(state)
+  }
+
+  /** {@inheritDoc} */
+  @Throws(IOException::class)
+  override fun close() {
+    close(state)
+  }
+
+  /** {@inheritDoc} */
+  @Throws(IOException::class)
+  override fun read(): Int {
+    if (bufferOffset >= remainingBufferBytes) {
+      remainingBufferBytes = read(buffer, 0, buffer.size)
+      bufferOffset = 0
+      if (remainingBufferBytes == END_OF_STREAM_MARKER) {
+        // Both Java and C# return the same value for EOF on single-byte read.
+        return -1
+      }
+    }
+    return buffer[bufferOffset++].toInt() and 0xFF
+  }
+
+  /** {@inheritDoc} */
+  @Throws(IOException::class)
+  override fun read(destBuffer: ByteArray, destOffset: Int, destLen: Int): Int {
+    require(destOffset >= 0) { "Bad offset: $destOffset" }
+    require(destLen >= 0) { "Bad length: $destLen" }
+    require(destOffset + destLen <= destBuffer.size) {
+      "Buffer overflow: " + (destOffset + destLen) + " > " + destBuffer.size
+    }
+    if (destLen == 0) {
+      return 0
+    }
+    var copyLen = Math.max(remainingBufferBytes - bufferOffset, 0)
+    var offset = destOffset
+    var len = destLen
+    if (copyLen != 0) {
+      copyLen = Math.min(copyLen, len)
+      System.arraycopy(buffer, bufferOffset, destBuffer, offset, copyLen)
+      bufferOffset += copyLen
+      offset += copyLen
+      len -= copyLen
+      if (len == 0) {
+        return copyLen
+      }
+    }
+    return try {
+      state.output = destBuffer
+      state.outputOffset = offset
+      state.outputLength = len
+      state.outputUsed = 0
+      decompress(state)
+      copyLen += state.outputUsed
+      copyLen = if (copyLen > 0) copyLen else END_OF_STREAM_MARKER
+      copyLen
+    } catch (ex: BrotliRuntimeException) {
+      throw IOException("Brotli stream decoding failed", ex)
+    }
+  }
+
+  companion object {
+    const val DEFAULT_INTERNAL_BUFFER_SIZE = 256
+
+    /**
+     * Value expected by InputStream contract when stream is over.
+     *
+     * In Java it is -1. In C# it is 0 (should be patched during transpilation).
+     */
+    private const val END_OF_STREAM_MARKER = -1
+  }
+}

java/org/brotli/integration/BUILD.bazel

@@ -23,9 +23,10 @@ java_library(
 java_library(
     name = "bundle_checker",
     srcs = ["BundleChecker.java"],
+    runtime_deps = ["//org/brotli/dec"],
     deps = [
         ":bundle_helper",
-        "//org/brotli/dec",
+        "//org/brotli/dec:test_utils",
     ],
 )
 

java/org/brotli/integration/BundleChecker.java

@@ -6,7 +6,8 @@
 
 package org.brotli.integration;
 
-import org.brotli.dec.BrotliInputStream;
+import static org.brotli.dec.TestUtils.newBrotliInputStream;
+
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FilterInputStream;
@@ -45,7 +46,7 @@ public class BundleChecker implements Runnable {
       public void close() {}
     };
 
-    BrotliInputStream decompressedStream = new BrotliInputStream(entryStream);
+    InputStream decompressedStream = newBrotliInputStream(entryStream);
     long crc;
     try {
       crc = BundleHelper.fingerprintStream(decompressedStream);