1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/spdy/spdy_buffer.h"
6
7#include <cstring>
8
9#include "base/callback.h"
10#include "base/logging.h"
11#include "net/base/io_buffer.h"
12#include "net/spdy/spdy_protocol.h"
13
14namespace net {
15
16namespace {
17
18// Makes a SpdyFrame with |size| bytes of data copied from
19// |data|. |data| must be non-NULL and |size| must be positive.
20scoped_ptr<SpdyFrame> MakeSpdyFrame(const char* data, size_t size) {
21  DCHECK(data);
22  DCHECK_GT(size, 0u);
23  scoped_ptr<char[]> frame_data(new char[size]);
24  std::memcpy(frame_data.get(), data, size);
25  scoped_ptr<SpdyFrame> frame(
26      new SpdyFrame(frame_data.release(), size, true /* owns_buffer */));
27  return frame.Pass();
28}
29
30}  // namespace
31
32// This class is an IOBuffer implementation that simply holds a
33// reference to a SharedFrame object and a fixed offset. Used by
34// SpdyBuffer::GetIOBufferForRemainingData().
35class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
36 public:
37  SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame,
38                      size_t offset)
39      : IOBuffer(shared_frame->data->data() + offset),
40        shared_frame_(shared_frame),
41        offset_(offset) {}
42
43 private:
44  virtual ~SharedFrameIOBuffer() {
45    // Prevent ~IOBuffer() from trying to delete |data_|.
46    data_ = NULL;
47  }
48
49  const scoped_refptr<SharedFrame> shared_frame_;
50  const size_t offset_;
51
52  DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer);
53};
54
55SpdyBuffer::SpdyBuffer(scoped_ptr<SpdyFrame> frame)
56    : shared_frame_(new SharedFrame()),
57      offset_(0) {
58  shared_frame_->data = frame.Pass();
59}
60
61// The given data may not be strictly a SPDY frame; we (ab)use
62// |frame_| just as a container.
63SpdyBuffer::SpdyBuffer(const char* data, size_t size) :
64    shared_frame_(new SharedFrame()),
65    offset_(0) {
66  shared_frame_->data = MakeSpdyFrame(data, size);
67}
68
69SpdyBuffer::~SpdyBuffer() {
70  if (GetRemainingSize() > 0)
71    ConsumeHelper(GetRemainingSize(), DISCARD);
72}
73
74const char* SpdyBuffer::GetRemainingData() const {
75  return shared_frame_->data->data() + offset_;
76}
77
78size_t SpdyBuffer::GetRemainingSize() const {
79  return shared_frame_->data->size() - offset_;
80}
81
82void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
83  consume_callbacks_.push_back(consume_callback);
84}
85
86void SpdyBuffer::Consume(size_t consume_size) {
87  ConsumeHelper(consume_size, CONSUME);
88};
89
90IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() {
91  return new SharedFrameIOBuffer(shared_frame_, offset_);
92}
93
94void SpdyBuffer::ConsumeHelper(size_t consume_size,
95                               ConsumeSource consume_source) {
96  DCHECK_GE(consume_size, 1u);
97  DCHECK_LE(consume_size, GetRemainingSize());
98  offset_ += consume_size;
99  for (std::vector<ConsumeCallback>::const_iterator it =
100           consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
101    it->Run(consume_size, consume_source);
102  }
103};
104
105}  // namespace net
106