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1 // Copyright 2013 The Chromium Authors
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/check_op.h"
11 #include "base/functional/callback.h"
12 #include "base/trace_event/memory_usage_estimator.h"
13 #include "net/base/io_buffer.h"
14 #include "net/third_party/quiche/src/quiche/spdy/core/spdy_protocol.h"
15 
16 namespace net {
17 
18 namespace {
19 
20 // Bound on largest frame any SPDY version has allowed.
21 const size_t kMaxSpdyFrameSize = 0x00ffffff;
22 
23 // Makes a spdy::SpdySerializedFrame with |size| bytes of data copied from
24 // |data|. |data| must be non-NULL and |size| must be positive.
MakeSpdySerializedFrame(const char * data,size_t size)25 std::unique_ptr<spdy::SpdySerializedFrame> MakeSpdySerializedFrame(
26     const char* data,
27     size_t size) {
28   DCHECK(data);
29   CHECK_GT(size, 0u);
30   CHECK_LE(size, kMaxSpdyFrameSize);
31 
32   auto frame_data = std::make_unique<char[]>(size);
33   std::memcpy(frame_data.get(), data, size);
34   return std::make_unique<spdy::SpdySerializedFrame>(frame_data.release(), size,
35                                                      true /* owns_buffer */);
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:
SharedFrameIOBuffer(const scoped_refptr<SharedFrame> & shared_frame,size_t offset)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   SharedFrameIOBuffer(const SharedFrameIOBuffer&) = delete;
51   SharedFrameIOBuffer& operator=(const SharedFrameIOBuffer&) = delete;
52 
53  private:
~SharedFrameIOBuffer()54   ~SharedFrameIOBuffer() override {
55     // Prevent ~IOBuffer() from trying to delete |data_|.
56     data_ = nullptr;
57   }
58 
59   const scoped_refptr<SharedFrame> shared_frame_;
60 };
61 
SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)62 SpdyBuffer::SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)
63     : shared_frame_(base::MakeRefCounted<SharedFrame>(std::move(frame))) {}
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_(base::MakeRefCounted<SharedFrame>()) {
69   CHECK_GT(size, 0u);
70   CHECK_LE(size, kMaxSpdyFrameSize);
71   shared_frame_->data = MakeSpdySerializedFrame(data, size);
72 }
73 
~SpdyBuffer()74 SpdyBuffer::~SpdyBuffer() {
75   if (GetRemainingSize() > 0)
76     ConsumeHelper(GetRemainingSize(), DISCARD);
77 }
78 
GetRemainingData() const79 const char* SpdyBuffer::GetRemainingData() const {
80   return shared_frame_->data->data() + offset_;
81 }
82 
GetRemainingSize() const83 size_t SpdyBuffer::GetRemainingSize() const {
84   return shared_frame_->data->size() - offset_;
85 }
86 
AddConsumeCallback(const ConsumeCallback & consume_callback)87 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
88   consume_callbacks_.push_back(consume_callback);
89 }
90 
Consume(size_t consume_size)91 void SpdyBuffer::Consume(size_t consume_size) {
92   ConsumeHelper(consume_size, CONSUME);
93 }
94 
GetIOBufferForRemainingData()95 scoped_refptr<IOBuffer> SpdyBuffer::GetIOBufferForRemainingData() {
96   return base::MakeRefCounted<SharedFrameIOBuffer>(shared_frame_, offset_);
97 }
98 
ConsumeHelper(size_t consume_size,ConsumeSource consume_source)99 void SpdyBuffer::ConsumeHelper(size_t consume_size,
100                                ConsumeSource consume_source) {
101   DCHECK_GE(consume_size, 1u);
102   DCHECK_LE(consume_size, GetRemainingSize());
103   offset_ += consume_size;
104   for (std::vector<ConsumeCallback>::const_iterator it =
105            consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
106     it->Run(consume_size, consume_source);
107   }
108 }
109 
110 }  // namespace net
111