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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 "base/profiler/scoped_tracker.h" | |
12 #include "net/base/io_buffer.h" | |
13 #include "net/spdy/spdy_protocol.h" | |
14 | |
15 namespace net { | |
16 | |
17 namespace { | |
18 | |
19 // Bound on largest frame any SPDY version has allowed. | |
20 const size_t kMaxSpdyFrameSize = 0x00ffffff; | |
21 | |
22 // Makes a SpdyFrame with |size| bytes of data copied from | |
23 // |data|. |data| must be non-NULL and |size| must be positive. | |
24 scoped_ptr<SpdyFrame> MakeSpdyFrame(const char* data, size_t size) { | |
25 DCHECK(data); | |
26 CHECK_GT(size, 0u); | |
27 CHECK_LE(size, kMaxSpdyFrameSize); | |
28 scoped_ptr<char[]> frame_data(new char[size]); | |
29 std::memcpy(frame_data.get(), data, size); | |
30 scoped_ptr<SpdyFrame> frame( | |
31 new SpdyFrame(frame_data.release(), size, true /* owns_buffer */)); | |
32 return frame.Pass(); | |
33 } | |
34 | |
35 } // namespace | |
36 | |
37 // This class is an IOBuffer implementation that simply holds a | |
38 // reference to a SharedFrame object and a fixed offset. Used by | |
39 // SpdyBuffer::GetIOBufferForRemainingData(). | |
40 class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer { | |
41 public: | |
42 SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame, | |
43 size_t offset) | |
44 : IOBuffer(shared_frame->data->data() + offset), | |
45 shared_frame_(shared_frame) {} | |
46 | |
47 private: | |
48 ~SharedFrameIOBuffer() override { | |
49 // Prevent ~IOBuffer() from trying to delete |data_|. | |
50 data_ = NULL; | |
51 } | |
52 | |
53 const scoped_refptr<SharedFrame> shared_frame_; | |
54 | |
55 DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer); | |
56 }; | |
57 | |
58 SpdyBuffer::SpdyBuffer(scoped_ptr<SpdyFrame> frame) | |
59 : shared_frame_(new SharedFrame()), | |
60 offset_(0) { | |
61 shared_frame_->data = frame.Pass(); | |
62 } | |
63 | |
64 // The given data may not be strictly a SPDY frame; we (ab)use | |
65 // |frame_| just as a container. | |
66 SpdyBuffer::SpdyBuffer(const char* data, size_t size) : | |
67 shared_frame_(new SharedFrame()), | |
68 offset_(0) { | |
69 CHECK_GT(size, 0u); | |
70 CHECK_LE(size, kMaxSpdyFrameSize); | |
71 shared_frame_->data = MakeSpdyFrame(data, size); | |
72 } | |
73 | |
74 SpdyBuffer::~SpdyBuffer() { | |
75 if (GetRemainingSize() > 0) | |
76 ConsumeHelper(GetRemainingSize(), DISCARD); | |
77 } | |
78 | |
79 const char* SpdyBuffer::GetRemainingData() const { | |
80 return shared_frame_->data->data() + offset_; | |
81 } | |
82 | |
83 size_t SpdyBuffer::GetRemainingSize() const { | |
84 return shared_frame_->data->size() - offset_; | |
85 } | |
86 | |
87 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) { | |
88 consume_callbacks_.push_back(consume_callback); | |
89 } | |
90 | |
91 void SpdyBuffer::Consume(size_t consume_size) { | |
92 // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is fixed. | |
93 tracked_objects::ScopedTracker tracking_profile( | |
94 FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdyBuffer::Consume")); | |
95 ConsumeHelper(consume_size, CONSUME); | |
96 }; | |
97 | |
98 IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() { | |
99 return new SharedFrameIOBuffer(shared_frame_, offset_); | |
100 } | |
101 | |
102 void SpdyBuffer::ConsumeHelper(size_t consume_size, | |
103 ConsumeSource consume_source) { | |
104 DCHECK_GE(consume_size, 1u); | |
105 DCHECK_LE(consume_size, GetRemainingSize()); | |
106 offset_ += consume_size; | |
107 for (std::vector<ConsumeCallback>::const_iterator it = | |
108 consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) { | |
109 it->Run(consume_size, consume_source); | |
110 } | |
111 }; | |
112 | |
113 } // namespace net | |
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