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>(std::move(frame_data),
35 size);
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(base::make_span(*shared_frame->data).subspan(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 `data_` from dangling should this destructor remove the
56 // last reference to `shared_frame`.
57 data_ = nullptr;
58 }
59
60 const scoped_refptr<SharedFrame> shared_frame_;
61 };
62
SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)63 SpdyBuffer::SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)
64 : shared_frame_(base::MakeRefCounted<SharedFrame>(std::move(frame))) {}
65
66 // The given data may not be strictly a SPDY frame; we (ab)use
67 // |frame_| just as a container.
SpdyBuffer(const char * data,size_t size)68 SpdyBuffer::SpdyBuffer(const char* data, size_t size)
69 : shared_frame_(base::MakeRefCounted<SharedFrame>()) {
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
ConsumeHelper(size_t consume_size,ConsumeSource consume_source)100 void SpdyBuffer::ConsumeHelper(size_t consume_size,
101 ConsumeSource consume_source) {
102 DCHECK_GE(consume_size, 1u);
103 DCHECK_LE(consume_size, GetRemainingSize());
104 offset_ += consume_size;
105 for (std::vector<ConsumeCallback>::const_iterator it =
106 consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
107 it->Run(consume_size, consume_source);
108 }
109 }
110
111 } // namespace net
112