• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
14 namespace net {
15 
16 namespace {
17 
18 // Makes a SpdyFrame with |size| bytes of data copied from
19 // |data|. |data| must be non-NULL and |size| must be positive.
MakeSpdyFrame(const char * data,size_t size)20 scoped_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().
35 class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
36  public:
SharedFrameIOBuffer(const scoped_refptr<SharedFrame> & shared_frame,size_t offset)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:
~SharedFrameIOBuffer()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 
SpdyBuffer(scoped_ptr<SpdyFrame> frame)55 SpdyBuffer::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.
SpdyBuffer(const char * data,size_t size)63 SpdyBuffer::SpdyBuffer(const char* data, size_t size) :
64     shared_frame_(new SharedFrame()),
65     offset_(0) {
66   shared_frame_->data = MakeSpdyFrame(data, size);
67 }
68 
~SpdyBuffer()69 SpdyBuffer::~SpdyBuffer() {
70   if (GetRemainingSize() > 0)
71     ConsumeHelper(GetRemainingSize(), DISCARD);
72 }
73 
GetRemainingData() const74 const char* SpdyBuffer::GetRemainingData() const {
75   return shared_frame_->data->data() + offset_;
76 }
77 
GetRemainingSize() const78 size_t SpdyBuffer::GetRemainingSize() const {
79   return shared_frame_->data->size() - offset_;
80 }
81 
AddConsumeCallback(const ConsumeCallback & consume_callback)82 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
83   consume_callbacks_.push_back(consume_callback);
84 }
85 
Consume(size_t consume_size)86 void SpdyBuffer::Consume(size_t consume_size) {
87   ConsumeHelper(consume_size, CONSUME);
88 };
89 
GetIOBufferForRemainingData()90 IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() {
91   return new SharedFrameIOBuffer(shared_frame_, offset_);
92 }
93 
ConsumeHelper(size_t consume_size,ConsumeSource consume_source)94 void 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