/thirdparty/breakpad/third_party/protobuf/protobuf/src/google/protobuf/message_lite.cc
http://github.com/tomahawk-player/tomahawk · C++ · 334 lines · 225 code · 45 blank · 64 comment · 20 complexity · e4b782047dd8c423ce03abc3b16d425a MD5 · raw file
- // 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.
- // Authors: wink@google.com (Wink Saville),
- // kenton@google.com (Kenton Varda)
- // Based on original Protocol Buffers design by
- // Sanjay Ghemawat, Jeff Dean, and others.
- #include <google/protobuf/message_lite.h>
- #include <string>
- #include <google/protobuf/stubs/common.h>
- #include <google/protobuf/io/coded_stream.h>
- #include <google/protobuf/io/zero_copy_stream_impl.h>
- #include <google/protobuf/stubs/stl_util-inl.h>
- namespace google {
- namespace protobuf {
- MessageLite::~MessageLite() {}
- string MessageLite::InitializationErrorString() const {
- return "(cannot determine missing fields for lite message)";
- }
- namespace {
- // When serializing, we first compute the byte size, then serialize the message.
- // If serialization produces a different number of bytes than expected, we
- // call this function, which crashes. The problem could be due to a bug in the
- // protobuf implementation but is more likely caused by concurrent modification
- // of the message. This function attempts to distinguish between the two and
- // provide a useful error message.
- void ByteSizeConsistencyError(int byte_size_before_serialization,
- int byte_size_after_serialization,
- int bytes_produced_by_serialization) {
- GOOGLE_CHECK_EQ(byte_size_before_serialization, byte_size_after_serialization)
- << "Protocol message was modified concurrently during serialization.";
- GOOGLE_CHECK_EQ(bytes_produced_by_serialization, byte_size_before_serialization)
- << "Byte size calculation and serialization were inconsistent. This "
- "may indicate a bug in protocol buffers or it may be caused by "
- "concurrent modification of the message.";
- GOOGLE_LOG(FATAL) << "This shouldn't be called if all the sizes are equal.";
- }
- string InitializationErrorMessage(const char* action,
- const MessageLite& message) {
- // Note: We want to avoid depending on strutil in the lite library, otherwise
- // we'd use:
- //
- // return strings::Substitute(
- // "Can't $0 message of type \"$1\" because it is missing required "
- // "fields: $2",
- // action, message.GetTypeName(),
- // message.InitializationErrorString());
- string result;
- result += "Can't ";
- result += action;
- result += " message of type \"";
- result += message.GetTypeName();
- result += "\" because it is missing required fields: ";
- result += message.InitializationErrorString();
- return result;
- }
- // Several of the Parse methods below just do one thing and then call another
- // method. In a naive implementation, we might have ParseFromString() call
- // ParseFromArray() which would call ParseFromZeroCopyStream() which would call
- // ParseFromCodedStream() which would call MergeFromCodedStream() which would
- // call MergePartialFromCodedStream(). However, when parsing very small
- // messages, every function call introduces significant overhead. To avoid
- // this without reproducing code, we use these forced-inline helpers.
- //
- // Note: GCC only allows GOOGLE_ATTRIBUTE_ALWAYS_INLINE on declarations, not
- // definitions.
- inline bool InlineMergeFromCodedStream(io::CodedInputStream* input,
- MessageLite* message)
- GOOGLE_ATTRIBUTE_ALWAYS_INLINE;
- inline bool InlineParseFromCodedStream(io::CodedInputStream* input,
- MessageLite* message)
- GOOGLE_ATTRIBUTE_ALWAYS_INLINE;
- inline bool InlineParsePartialFromCodedStream(io::CodedInputStream* input,
- MessageLite* message)
- GOOGLE_ATTRIBUTE_ALWAYS_INLINE;
- inline bool InlineParseFromArray(const void* data, int size,
- MessageLite* message)
- GOOGLE_ATTRIBUTE_ALWAYS_INLINE;
- inline bool InlineParsePartialFromArray(const void* data, int size,
- MessageLite* message)
- GOOGLE_ATTRIBUTE_ALWAYS_INLINE;
- bool InlineMergeFromCodedStream(io::CodedInputStream* input,
- MessageLite* message) {
- if (!message->MergePartialFromCodedStream(input)) return false;
- if (!message->IsInitialized()) {
- GOOGLE_LOG(ERROR) << InitializationErrorMessage("parse", *message);
- return false;
- }
- return true;
- }
- bool InlineParseFromCodedStream(io::CodedInputStream* input,
- MessageLite* message) {
- message->Clear();
- return InlineMergeFromCodedStream(input, message);
- }
- bool InlineParsePartialFromCodedStream(io::CodedInputStream* input,
- MessageLite* message) {
- message->Clear();
- return message->MergePartialFromCodedStream(input);
- }
- bool InlineParseFromArray(const void* data, int size, MessageLite* message) {
- io::CodedInputStream input(reinterpret_cast<const uint8*>(data), size);
- return InlineParseFromCodedStream(&input, message) &&
- input.ConsumedEntireMessage();
- }
- bool InlineParsePartialFromArray(const void* data, int size,
- MessageLite* message) {
- io::CodedInputStream input(reinterpret_cast<const uint8*>(data), size);
- return InlineParsePartialFromCodedStream(&input, message) &&
- input.ConsumedEntireMessage();
- }
- } // namespace
- bool MessageLite::MergeFromCodedStream(io::CodedInputStream* input) {
- return InlineMergeFromCodedStream(input, this);
- }
- bool MessageLite::ParseFromCodedStream(io::CodedInputStream* input) {
- return InlineParseFromCodedStream(input, this);
- }
- bool MessageLite::ParsePartialFromCodedStream(io::CodedInputStream* input) {
- return InlineParsePartialFromCodedStream(input, this);
- }
- bool MessageLite::ParseFromZeroCopyStream(io::ZeroCopyInputStream* input) {
- io::CodedInputStream decoder(input);
- return ParseFromCodedStream(&decoder) && decoder.ConsumedEntireMessage();
- }
- bool MessageLite::ParsePartialFromZeroCopyStream(
- io::ZeroCopyInputStream* input) {
- io::CodedInputStream decoder(input);
- return ParsePartialFromCodedStream(&decoder) &&
- decoder.ConsumedEntireMessage();
- }
- bool MessageLite::ParseFromBoundedZeroCopyStream(
- io::ZeroCopyInputStream* input, int size) {
- io::CodedInputStream decoder(input);
- decoder.PushLimit(size);
- return ParseFromCodedStream(&decoder) &&
- decoder.ConsumedEntireMessage() &&
- decoder.BytesUntilLimit() == 0;
- }
- bool MessageLite::ParsePartialFromBoundedZeroCopyStream(
- io::ZeroCopyInputStream* input, int size) {
- io::CodedInputStream decoder(input);
- decoder.PushLimit(size);
- return ParsePartialFromCodedStream(&decoder) &&
- decoder.ConsumedEntireMessage() &&
- decoder.BytesUntilLimit() == 0;
- }
- bool MessageLite::ParseFromString(const string& data) {
- return InlineParseFromArray(data.data(), data.size(), this);
- }
- bool MessageLite::ParsePartialFromString(const string& data) {
- return InlineParsePartialFromArray(data.data(), data.size(), this);
- }
- bool MessageLite::ParseFromArray(const void* data, int size) {
- return InlineParseFromArray(data, size, this);
- }
- bool MessageLite::ParsePartialFromArray(const void* data, int size) {
- return InlineParsePartialFromArray(data, size, this);
- }
- // ===================================================================
- uint8* MessageLite::SerializeWithCachedSizesToArray(uint8* target) const {
- // We only optimize this when using optimize_for = SPEED. In other cases
- // we just use the CodedOutputStream path.
- int size = GetCachedSize();
- io::ArrayOutputStream out(target, size);
- io::CodedOutputStream coded_out(&out);
- SerializeWithCachedSizes(&coded_out);
- GOOGLE_CHECK(!coded_out.HadError());
- return target + size;
- }
- bool MessageLite::SerializeToCodedStream(io::CodedOutputStream* output) const {
- GOOGLE_DCHECK(IsInitialized()) << InitializationErrorMessage("serialize", *this);
- return SerializePartialToCodedStream(output);
- }
- bool MessageLite::SerializePartialToCodedStream(
- io::CodedOutputStream* output) const {
- const int size = ByteSize(); // Force size to be cached.
- uint8* buffer = output->GetDirectBufferForNBytesAndAdvance(size);
- if (buffer != NULL) {
- uint8* end = SerializeWithCachedSizesToArray(buffer);
- if (end - buffer != size) {
- ByteSizeConsistencyError(size, ByteSize(), end - buffer);
- }
- return true;
- } else {
- int original_byte_count = output->ByteCount();
- SerializeWithCachedSizes(output);
- if (output->HadError()) {
- return false;
- }
- int final_byte_count = output->ByteCount();
- if (final_byte_count - original_byte_count != size) {
- ByteSizeConsistencyError(size, ByteSize(),
- final_byte_count - original_byte_count);
- }
- return true;
- }
- }
- bool MessageLite::SerializeToZeroCopyStream(
- io::ZeroCopyOutputStream* output) const {
- io::CodedOutputStream encoder(output);
- return SerializeToCodedStream(&encoder);
- }
- bool MessageLite::SerializePartialToZeroCopyStream(
- io::ZeroCopyOutputStream* output) const {
- io::CodedOutputStream encoder(output);
- return SerializePartialToCodedStream(&encoder);
- }
- bool MessageLite::AppendToString(string* output) const {
- GOOGLE_DCHECK(IsInitialized()) << InitializationErrorMessage("serialize", *this);
- return AppendPartialToString(output);
- }
- bool MessageLite::AppendPartialToString(string* output) const {
- int old_size = output->size();
- int byte_size = ByteSize();
- STLStringResizeUninitialized(output, old_size + byte_size);
- uint8* start = reinterpret_cast<uint8*>(string_as_array(output) + old_size);
- uint8* end = SerializeWithCachedSizesToArray(start);
- if (end - start != byte_size) {
- ByteSizeConsistencyError(byte_size, ByteSize(), end - start);
- }
- return true;
- }
- bool MessageLite::SerializeToString(string* output) const {
- output->clear();
- return AppendToString(output);
- }
- bool MessageLite::SerializePartialToString(string* output) const {
- output->clear();
- return AppendPartialToString(output);
- }
- bool MessageLite::SerializeToArray(void* data, int size) const {
- GOOGLE_DCHECK(IsInitialized()) << InitializationErrorMessage("serialize", *this);
- return SerializePartialToArray(data, size);
- }
- bool MessageLite::SerializePartialToArray(void* data, int size) const {
- int byte_size = ByteSize();
- if (size < byte_size) return false;
- uint8* start = reinterpret_cast<uint8*>(data);
- uint8* end = SerializeWithCachedSizesToArray(start);
- if (end - start != byte_size) {
- ByteSizeConsistencyError(byte_size, ByteSize(), end - start);
- }
- return true;
- }
- string MessageLite::SerializeAsString() const {
- // If the compiler implements the (Named) Return Value Optimization,
- // the local variable 'result' will not actually reside on the stack
- // of this function, but will be overlaid with the object that the
- // caller supplied for the return value to be constructed in.
- string output;
- if (!AppendToString(&output))
- output.clear();
- return output;
- }
- string MessageLite::SerializePartialAsString() const {
- string output;
- if (!AppendPartialToString(&output))
- output.clear();
- return output;
- }
- } // namespace protobuf
- } // namespace google