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 "base/trace_event/memory_usage_estimator.h"
14 #include "net/base/io_buffer.h"
15 #include "net/third_party/quiche/src/spdy/core/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 spdy::SpdySerializedFrame with |size| bytes of data copied from
25 // |data|. |data| must be non-NULL and |size| must be positive.
MakeSpdySerializedFrame(const char * data,size_t size)26 std::unique_ptr<spdy::SpdySerializedFrame> MakeSpdySerializedFrame(
27 const char* data,
28 size_t size) {
29 DCHECK(data);
30 CHECK_GT(size, 0u);
31 CHECK_LE(size, kMaxSpdyFrameSize);
32
33 auto frame_data = std::make_unique<char[]>(size);
34 std::memcpy(frame_data.get(), data, size);
35 return std::make_unique<spdy::SpdySerializedFrame>(frame_data.release(), size,
36 true /* owns_buffer */);
37 }
38
39 } // namespace
40
41 // This class is an IOBuffer implementation that simply holds a
42 // reference to a SharedFrame object and a fixed offset. Used by
43 // SpdyBuffer::GetIOBufferForRemainingData().
44 class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
45 public:
SharedFrameIOBuffer(const scoped_refptr<SharedFrame> & shared_frame,size_t offset)46 SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame,
47 size_t offset)
48 : IOBuffer(shared_frame->data->data() + offset),
49 shared_frame_(shared_frame) {}
50
51 private:
~SharedFrameIOBuffer()52 ~SharedFrameIOBuffer() override {
53 // Prevent ~IOBuffer() from trying to delete |data_|.
54 data_ = nullptr;
55 }
56
57 const scoped_refptr<SharedFrame> shared_frame_;
58
59 DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer);
60 };
61
SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)62 SpdyBuffer::SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)
63 : shared_frame_(new SharedFrame(std::move(frame))), offset_(0) {}
64
65 // The given data may not be strictly a SPDY frame; we (ab)use
66 // |frame_| just as a container.
SpdyBuffer(const char * data,size_t size)67 SpdyBuffer::SpdyBuffer(const char* data, size_t size) :
68 shared_frame_(new SharedFrame()),
69 offset_(0) {
70 CHECK_GT(size, 0u);
71 CHECK_LE(size, kMaxSpdyFrameSize);
72 shared_frame_->data = MakeSpdySerializedFrame(data, size);
73 }
74
~SpdyBuffer()75 SpdyBuffer::~SpdyBuffer() {
76 if (GetRemainingSize() > 0)
77 ConsumeHelper(GetRemainingSize(), DISCARD);
78 }
79
GetRemainingData() const80 const char* SpdyBuffer::GetRemainingData() const {
81 return shared_frame_->data->data() + offset_;
82 }
83
GetRemainingSize() const84 size_t SpdyBuffer::GetRemainingSize() const {
85 return shared_frame_->data->size() - offset_;
86 }
87
AddConsumeCallback(const ConsumeCallback & consume_callback)88 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
89 consume_callbacks_.push_back(consume_callback);
90 }
91
Consume(size_t consume_size)92 void SpdyBuffer::Consume(size_t consume_size) {
93 ConsumeHelper(consume_size, CONSUME);
94 }
95
GetIOBufferForRemainingData()96 scoped_refptr<IOBuffer> SpdyBuffer::GetIOBufferForRemainingData() {
97 return base::MakeRefCounted<SharedFrameIOBuffer>(shared_frame_, offset_);
98 }
99
EstimateMemoryUsage() const100 size_t SpdyBuffer::EstimateMemoryUsage() const {
101 // TODO(xunjieli): Estimate |consume_callbacks_|. https://crbug.com/669108.
102 return base::trace_event::EstimateMemoryUsage(shared_frame_->data);
103 }
104
ConsumeHelper(size_t consume_size,ConsumeSource consume_source)105 void SpdyBuffer::ConsumeHelper(size_t consume_size,
106 ConsumeSource consume_source) {
107 DCHECK_GE(consume_size, 1u);
108 DCHECK_LE(consume_size, GetRemainingSize());
109 offset_ += consume_size;
110 for (std::vector<ConsumeCallback>::const_iterator it =
111 consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
112 it->Run(consume_size, consume_source);
113 }
114 }
115
116 } // namespace net
117