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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 #include <utility> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/logging.h" | |
12 #include "base/macros.h" | |
13 #include "net/base/io_buffer.h" | |
14 #include "net/spdy/platform/api/spdy_estimate_memory_usage.h" | |
15 #include "net/spdy/spdy_protocol.h" | |
16 | |
17 namespace net { | |
18 | |
19 namespace { | |
20 | |
21 // Bound on largest frame any SPDY version has allowed. | |
22 const size_t kMaxSpdyFrameSize = 0x00ffffff; | |
23 | |
24 // Makes a SpdySerializedFrame with |size| bytes of data copied from |data|. | |
25 // |data| must be non-NULL and |size| must be positive. | |
26 std::unique_ptr<SpdySerializedFrame> MakeSpdySerializedFrame(const char* data, | |
27 size_t size) { | |
28 DCHECK(data); | |
29 CHECK_GT(size, 0u); | |
30 CHECK_LE(size, kMaxSpdyFrameSize); | |
31 std::unique_ptr<char[]> frame_data(new char[size]); | |
32 std::memcpy(frame_data.get(), data, size); | |
33 std::unique_ptr<SpdySerializedFrame> frame(new SpdySerializedFrame( | |
34 frame_data.release(), size, true /* owns_buffer */)); | |
35 return frame; | |
36 } | |
37 | |
38 } // namespace | |
39 | |
40 // This class is an IOBuffer implementation that simply holds a | |
41 // reference to a SharedFrame object and a fixed offset. Used by | |
42 // SpdyBuffer::GetIOBufferForRemainingData(). | |
43 class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer { | |
44 public: | |
45 SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame, | |
46 size_t offset) | |
47 : IOBuffer(shared_frame->data->data() + offset), | |
48 shared_frame_(shared_frame) {} | |
49 | |
50 private: | |
51 ~SharedFrameIOBuffer() override { | |
52 // Prevent ~IOBuffer() from trying to delete |data_|. | |
53 data_ = NULL; | |
54 } | |
55 | |
56 const scoped_refptr<SharedFrame> shared_frame_; | |
57 | |
58 DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer); | |
59 }; | |
60 | |
61 SpdyBuffer::SpdyBuffer(std::unique_ptr<SpdySerializedFrame> frame) | |
62 : shared_frame_(new SharedFrame()), offset_(0) { | |
63 shared_frame_->data = std::move(frame); | |
64 } | |
65 | |
66 // The given data may not be strictly a SPDY frame; we (ab)use | |
67 // |frame_| just as a container. | |
68 SpdyBuffer::SpdyBuffer(const char* data, size_t size) : | |
69 shared_frame_(new SharedFrame()), | |
70 offset_(0) { | |
71 CHECK_GT(size, 0u); | |
72 CHECK_LE(size, kMaxSpdyFrameSize); | |
73 shared_frame_->data = MakeSpdySerializedFrame(data, size); | |
74 } | |
75 | |
76 SpdyBuffer::~SpdyBuffer() { | |
77 if (GetRemainingSize() > 0) | |
78 ConsumeHelper(GetRemainingSize(), DISCARD); | |
79 } | |
80 | |
81 const char* SpdyBuffer::GetRemainingData() const { | |
82 return shared_frame_->data->data() + offset_; | |
83 } | |
84 | |
85 size_t SpdyBuffer::GetRemainingSize() const { | |
86 return shared_frame_->data->size() - offset_; | |
87 } | |
88 | |
89 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) { | |
90 consume_callbacks_.push_back(consume_callback); | |
91 } | |
92 | |
93 void SpdyBuffer::Consume(size_t consume_size) { | |
94 ConsumeHelper(consume_size, CONSUME); | |
95 }; | |
96 | |
97 IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() { | |
98 return new SharedFrameIOBuffer(shared_frame_, offset_); | |
99 } | |
100 | |
101 size_t SpdyBuffer::EstimateMemoryUsage() const { | |
102 // TODO(xunjieli): Estimate |consume_callbacks_|. https://crbug.com/669108. | |
103 return SpdyEstimateMemoryUsage(shared_frame_->data); | |
104 } | |
105 | |
106 void SpdyBuffer::ConsumeHelper(size_t consume_size, | |
107 ConsumeSource consume_source) { | |
108 DCHECK_GE(consume_size, 1u); | |
109 DCHECK_LE(consume_size, GetRemainingSize()); | |
110 offset_ += consume_size; | |
111 for (std::vector<ConsumeCallback>::const_iterator it = | |
112 consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) { | |
113 it->Run(consume_size, consume_source); | |
114 } | |
115 }; | |
116 | |
117 } // namespace net | |
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