mirror of
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116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/spdy/chromium/spdy_buffer.h"
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#include <cstring>
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#include <utility>
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#include "base/callback.h"
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#include "base/logging.h"
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#include "base/macros.h"
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#include "net/base/io_buffer.h"
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#include "net/spdy/core/spdy_protocol.h"
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#include "net/spdy/platform/api/spdy_estimate_memory_usage.h"
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namespace net {
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namespace {
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// Bound on largest frame any SPDY version has allowed.
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const size_t kMaxSpdyFrameSize = 0x00ffffff;
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// Makes a SpdySerializedFrame with |size| bytes of data copied from |data|.
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// |data| must be non-NULL and |size| must be positive.
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std::unique_ptr<SpdySerializedFrame> MakeSpdySerializedFrame(const char* data,
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size_t size) {
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DCHECK(data);
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CHECK_GT(size, 0u);
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CHECK_LE(size, kMaxSpdyFrameSize);
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auto frame_data = std::make_unique<char[]>(size);
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std::memcpy(frame_data.get(), data, size);
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return std::make_unique<SpdySerializedFrame>(frame_data.release(), size,
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true /* owns_buffer */);
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}
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} // namespace
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// This class is an IOBuffer implementation that simply holds a
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// reference to a SharedFrame object and a fixed offset. Used by
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// SpdyBuffer::GetIOBufferForRemainingData().
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class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
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public:
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SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame,
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size_t offset)
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: IOBuffer(shared_frame->data->data() + offset),
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shared_frame_(shared_frame) {}
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private:
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~SharedFrameIOBuffer() override {
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// Prevent ~IOBuffer() from trying to delete |data_|.
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data_ = NULL;
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}
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const scoped_refptr<SharedFrame> shared_frame_;
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DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer);
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};
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SpdyBuffer::SpdyBuffer(std::unique_ptr<SpdySerializedFrame> frame)
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: shared_frame_(new SharedFrame(std::move(frame))), offset_(0) {}
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// The given data may not be strictly a SPDY frame; we (ab)use
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// |frame_| just as a container.
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SpdyBuffer::SpdyBuffer(const char* data, size_t size) :
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shared_frame_(new SharedFrame()),
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offset_(0) {
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CHECK_GT(size, 0u);
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CHECK_LE(size, kMaxSpdyFrameSize);
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shared_frame_->data = MakeSpdySerializedFrame(data, size);
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}
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SpdyBuffer::~SpdyBuffer() {
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if (GetRemainingSize() > 0)
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ConsumeHelper(GetRemainingSize(), DISCARD);
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}
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const char* SpdyBuffer::GetRemainingData() const {
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return shared_frame_->data->data() + offset_;
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}
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size_t SpdyBuffer::GetRemainingSize() const {
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return shared_frame_->data->size() - offset_;
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}
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void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
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consume_callbacks_.push_back(consume_callback);
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}
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void SpdyBuffer::Consume(size_t consume_size) {
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ConsumeHelper(consume_size, CONSUME);
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}
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IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() {
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return new SharedFrameIOBuffer(shared_frame_, offset_);
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}
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size_t SpdyBuffer::EstimateMemoryUsage() const {
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// TODO(xunjieli): Estimate |consume_callbacks_|. https://crbug.com/669108.
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return SpdyEstimateMemoryUsage(shared_frame_->data);
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}
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void SpdyBuffer::ConsumeHelper(size_t consume_size,
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ConsumeSource consume_source) {
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DCHECK_GE(consume_size, 1u);
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DCHECK_LE(consume_size, GetRemainingSize());
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offset_ += consume_size;
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for (std::vector<ConsumeCallback>::const_iterator it =
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consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
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it->Run(consume_size, consume_source);
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}
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}
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} // namespace net
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