Import Cobalt 6.14197
diff --git a/src/content/browser/speech/chunked_byte_buffer.cc b/src/content/browser/speech/chunked_byte_buffer.cc
new file mode 100644
index 0000000..a43e40a
--- /dev/null
+++ b/src/content/browser/speech/chunked_byte_buffer.cc
@@ -0,0 +1,134 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/speech/chunked_byte_buffer.h"
+
+#include <algorithm>
+#include <utility>
+
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+
+namespace {
+
+static const size_t kHeaderLength = sizeof(uint32_t);
+
+static_assert(sizeof(size_t) >= kHeaderLength,
+ "chunked byte buffer not supported on this architecture");
+
+uint32_t ReadBigEndian32(const uint8_t* buffer) {
+ return (static_cast<uint32_t>(buffer[3])) |
+ (static_cast<uint32_t>(buffer[2]) << 8) |
+ (static_cast<uint32_t>(buffer[1]) << 16) |
+ (static_cast<uint32_t>(buffer[0]) << 24);
+}
+
+} // namespace
+
+namespace content {
+
+ChunkedByteBuffer::ChunkedByteBuffer()
+ : partial_chunk_(new Chunk()),
+ total_bytes_stored_(0) {
+}
+
+ChunkedByteBuffer::~ChunkedByteBuffer() {
+ Clear();
+}
+
+void ChunkedByteBuffer::Append(const uint8_t* start, size_t length) {
+ size_t remaining_bytes = length;
+ const uint8_t* next_data = start;
+
+ while (remaining_bytes > 0) {
+ DCHECK(partial_chunk_ != NULL);
+ size_t insert_length = 0;
+ bool header_completed = false;
+ bool content_completed = false;
+ std::vector<uint8_t>* insert_target;
+
+ if (partial_chunk_->header.size() < kHeaderLength) {
+ const size_t bytes_to_complete_header =
+ kHeaderLength - partial_chunk_->header.size();
+ insert_length = std::min(bytes_to_complete_header, remaining_bytes);
+ insert_target = &partial_chunk_->header;
+ header_completed = (remaining_bytes >= bytes_to_complete_header);
+ } else {
+ DCHECK_LT(partial_chunk_->content->size(),
+ partial_chunk_->ExpectedContentLength());
+ const size_t bytes_to_complete_chunk =
+ partial_chunk_->ExpectedContentLength() -
+ partial_chunk_->content->size();
+ insert_length = std::min(bytes_to_complete_chunk, remaining_bytes);
+ insert_target = partial_chunk_->content.get();
+ content_completed = (remaining_bytes >= bytes_to_complete_chunk);
+ }
+
+ DCHECK_GT(insert_length, 0U);
+ DCHECK_LE(insert_length, remaining_bytes);
+ DCHECK_LE(next_data + insert_length, start + length);
+ insert_target->insert(insert_target->end(),
+ next_data,
+ next_data + insert_length);
+ next_data += insert_length;
+ remaining_bytes -= insert_length;
+
+ if (header_completed) {
+ DCHECK_EQ(partial_chunk_->header.size(), kHeaderLength);
+ if (partial_chunk_->ExpectedContentLength() == 0) {
+ // Handle zero-byte chunks.
+ chunks_.push_back(partial_chunk_.release());
+ partial_chunk_.reset(new Chunk());
+ } else {
+ partial_chunk_->content->reserve(
+ partial_chunk_->ExpectedContentLength());
+ }
+ } else if (content_completed) {
+ DCHECK_EQ(partial_chunk_->content->size(),
+ partial_chunk_->ExpectedContentLength());
+ chunks_.push_back(partial_chunk_.release());
+ partial_chunk_.reset(new Chunk());
+ }
+ }
+ DCHECK_EQ(next_data, start + length);
+ total_bytes_stored_ += length;
+}
+
+void ChunkedByteBuffer::Append(const std::string& string) {
+ Append(reinterpret_cast<const uint8_t*>(string.data()), string.size());
+}
+
+bool ChunkedByteBuffer::HasChunks() const {
+ return !chunks_.empty();
+}
+
+std::unique_ptr<std::vector<uint8_t>> ChunkedByteBuffer::PopChunk() {
+ if (chunks_.empty())
+ return std::unique_ptr<std::vector<uint8_t>>();
+ std::unique_ptr<Chunk> chunk(*chunks_.begin());
+ chunks_.weak_erase(chunks_.begin());
+ DCHECK_EQ(chunk->header.size(), kHeaderLength);
+ DCHECK_EQ(chunk->content->size(), chunk->ExpectedContentLength());
+ total_bytes_stored_ -= chunk->content->size();
+ total_bytes_stored_ -= kHeaderLength;
+ return std::move(chunk->content);
+}
+
+void ChunkedByteBuffer::Clear() {
+ chunks_.clear();
+ partial_chunk_.reset(new Chunk());
+ total_bytes_stored_ = 0;
+}
+
+ChunkedByteBuffer::Chunk::Chunk() : content(new std::vector<uint8_t>()) {}
+
+ChunkedByteBuffer::Chunk::~Chunk() {
+}
+
+size_t ChunkedByteBuffer::Chunk::ExpectedContentLength() const {
+ DCHECK_EQ(header.size(), kHeaderLength);
+ return static_cast<size_t>(ReadBigEndian32(&header[0]));
+}
+
+} // namespace content
