protobuf/objectivec/GPBWireFormat.h
Thomas Van Lenten c18aa7795a Validate the tag numbers when parsing. ()
There was a twist code path (that some times showed up due to what happened to
be in memory in failure cases), that would cast a bogus wire type into the
enum, and then fall through switch statements.

Resolve this by validating all wire types when parsing tags and throwing the
error at that point so it can't enter the system.

As added safety, stick in a few asserts for apis that get passed tags to ensure
they also are only seeing valid data.

Bonus: Tweak the parsing loop to skip some work when we get the end marker
(zero tag) instead of still looping through all the fields.
2016-06-29 09:51:13 -04:00

74 lines
3.0 KiB
Objective-C

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
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//
// * Redistributions of source code must retain the above copyright
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// * Redistributions in binary form must reproduce the above
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#import "GPBRuntimeTypes.h"
CF_EXTERN_C_BEGIN
NS_ASSUME_NONNULL_BEGIN
typedef enum {
GPBWireFormatVarint = 0,
GPBWireFormatFixed64 = 1,
GPBWireFormatLengthDelimited = 2,
GPBWireFormatStartGroup = 3,
GPBWireFormatEndGroup = 4,
GPBWireFormatFixed32 = 5,
} GPBWireFormat;
enum {
GPBWireFormatMessageSetItem = 1,
GPBWireFormatMessageSetTypeId = 2,
GPBWireFormatMessageSetMessage = 3
};
uint32_t GPBWireFormatMakeTag(uint32_t fieldNumber, GPBWireFormat wireType)
__attribute__((const));
GPBWireFormat GPBWireFormatGetTagWireType(uint32_t tag) __attribute__((const));
uint32_t GPBWireFormatGetTagFieldNumber(uint32_t tag) __attribute__((const));
BOOL GPBWireFormatIsValidTag(uint32_t tag) __attribute__((const));
GPBWireFormat GPBWireFormatForType(GPBDataType dataType, BOOL isPacked)
__attribute__((const));
#define GPBWireFormatMessageSetItemTag \
(GPBWireFormatMakeTag(GPBWireFormatMessageSetItem, GPBWireFormatStartGroup))
#define GPBWireFormatMessageSetItemEndTag \
(GPBWireFormatMakeTag(GPBWireFormatMessageSetItem, GPBWireFormatEndGroup))
#define GPBWireFormatMessageSetTypeIdTag \
(GPBWireFormatMakeTag(GPBWireFormatMessageSetTypeId, GPBWireFormatVarint))
#define GPBWireFormatMessageSetMessageTag \
(GPBWireFormatMakeTag(GPBWireFormatMessageSetMessage, \
GPBWireFormatLengthDelimited))
NS_ASSUME_NONNULL_END
CF_EXTERN_C_END