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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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