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 #ifdef UNSAFE_BUFFERS_BUILD
6 // TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
7 #pragma allow_unsafe_buffers
8 #endif
9
10 #include "net/spdy/spdy_buffer.h"
11
12 #include <cstring>
13 #include <utility>
14
15 #include "base/check_op.h"
16 #include "base/functional/callback.h"
17 #include "base/trace_event/memory_usage_estimator.h"
18 #include "net/base/io_buffer.h"
19 #include "net/third_party/quiche/src/quiche/http2/core/spdy_protocol.h"
20
21 namespace net {
22
23 namespace {
24
25 // Bound on largest frame any SPDY version has allowed.
26 const size_t kMaxSpdyFrameSize = 0x00ffffff;
27
28 // Makes a spdy::SpdySerializedFrame with |size| bytes of data copied from
29 // |data|. |data| must be non-NULL and |size| must be positive.
MakeSpdySerializedFrame(const char * data,size_t size)30 std::unique_ptr<spdy::SpdySerializedFrame> MakeSpdySerializedFrame(
31 const char* data,
32 size_t size) {
33 DCHECK(data);
34 CHECK_GT(size, 0u);
35 CHECK_LE(size, kMaxSpdyFrameSize);
36
37 auto frame_data = std::make_unique<char[]>(size);
38 std::memcpy(frame_data.get(), data, size);
39 return std::make_unique<spdy::SpdySerializedFrame>(std::move(frame_data),
40 size);
41 }
42
43 } // namespace
44
45 // This class is an IOBuffer implementation that simply holds a
46 // reference to a SharedFrame object and a fixed offset. Used by
47 // SpdyBuffer::GetIOBufferForRemainingData().
48 class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
49 public:
SharedFrameIOBuffer(const scoped_refptr<SharedFrame> & shared_frame,size_t offset)50 SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame,
51 size_t offset)
52 : IOBuffer(base::span(*shared_frame->data).subspan(offset)),
53 shared_frame_(shared_frame) {}
54
55 SharedFrameIOBuffer(const SharedFrameIOBuffer&) = delete;
56 SharedFrameIOBuffer& operator=(const SharedFrameIOBuffer&) = delete;
57
58 private:
~SharedFrameIOBuffer()59 ~SharedFrameIOBuffer() override {
60 // Prevent `data_` from dangling should this destructor remove the
61 // last reference to `shared_frame`.
62 data_ = nullptr;
63 }
64
65 const scoped_refptr<SharedFrame> shared_frame_;
66 };
67
SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)68 SpdyBuffer::SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)
69 : shared_frame_(base::MakeRefCounted<SharedFrame>(std::move(frame))) {}
70
71 // The given data may not be strictly a SPDY frame; we (ab)use
72 // |frame_| just as a container.
SpdyBuffer(const char * data,size_t size)73 SpdyBuffer::SpdyBuffer(const char* data, size_t size)
74 : shared_frame_(base::MakeRefCounted<SharedFrame>()) {
75 CHECK_GT(size, 0u);
76 CHECK_LE(size, kMaxSpdyFrameSize);
77 shared_frame_->data = MakeSpdySerializedFrame(data, size);
78 }
79
~SpdyBuffer()80 SpdyBuffer::~SpdyBuffer() {
81 if (GetRemainingSize() > 0)
82 ConsumeHelper(GetRemainingSize(), DISCARD);
83 }
84
GetRemainingData() const85 const char* SpdyBuffer::GetRemainingData() const {
86 return shared_frame_->data->data() + offset_;
87 }
88
GetRemainingSize() const89 size_t SpdyBuffer::GetRemainingSize() const {
90 return shared_frame_->data->size() - offset_;
91 }
92
AddConsumeCallback(const ConsumeCallback & consume_callback)93 void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
94 consume_callbacks_.push_back(consume_callback);
95 }
96
Consume(size_t consume_size)97 void SpdyBuffer::Consume(size_t consume_size) {
98 ConsumeHelper(consume_size, CONSUME);
99 }
100
GetIOBufferForRemainingData()101 scoped_refptr<IOBuffer> SpdyBuffer::GetIOBufferForRemainingData() {
102 return base::MakeRefCounted<SharedFrameIOBuffer>(shared_frame_, offset_);
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