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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/spdy/spdy_buffer.h"
#include <cstring>
#include <utility>
#include "base/check_op.h"
#include "base/functional/callback.h"
#include "base/trace_event/memory_usage_estimator.h"
#include "net/base/io_buffer.h"
#include "net/third_party/quiche/src/quiche/http2/core/spdy_protocol.h"
namespace net {
namespace {
// Bound on largest frame any SPDY version has allowed.
const size_t kMaxSpdyFrameSize = 0x00ffffff;
// Makes a spdy::SpdySerializedFrame with |size| bytes of data copied from
// |data|. |data| must be non-NULL and |size| must be positive.
std::unique_ptr<spdy::SpdySerializedFrame> MakeSpdySerializedFrame(
const char* data,
size_t size) {
DCHECK(data);
CHECK_GT(size, 0u);
CHECK_LE(size, kMaxSpdyFrameSize);
auto frame_data = std::make_unique<char[]>(size);
std::memcpy(frame_data.get(), data, size);
return std::make_unique<spdy::SpdySerializedFrame>(std::move(frame_data),
size);
}
} // namespace
// This class is an IOBuffer implementation that simply holds a
// reference to a SharedFrame object and a fixed offset. Used by
// SpdyBuffer::GetIOBufferForRemainingData().
class SpdyBuffer::SharedFrameIOBuffer : public IOBuffer {
public:
SharedFrameIOBuffer(const scoped_refptr<SharedFrame>& shared_frame,
size_t offset)
: IOBuffer(base::span(*shared_frame->data).subspan(offset)),
shared_frame_(shared_frame) {}
SharedFrameIOBuffer(const SharedFrameIOBuffer&) = delete;
SharedFrameIOBuffer& operator=(const SharedFrameIOBuffer&) = delete;
private:
~SharedFrameIOBuffer() override {
// Prevent `data_` from dangling should this destructor remove the
// last reference to `shared_frame`.
ClearSpan();
}
const scoped_refptr<SharedFrame> shared_frame_;
};
SpdyBuffer::SpdyBuffer(std::unique_ptr<spdy::SpdySerializedFrame> frame)
: shared_frame_(base::MakeRefCounted<SharedFrame>(std::move(frame))) {}
// The given data may not be strictly a SPDY frame; we (ab)use
// |frame_| just as a container.
SpdyBuffer::SpdyBuffer(const char* data, size_t size)
: shared_frame_(base::MakeRefCounted<SharedFrame>()) {
CHECK_GT(size, 0u);
CHECK_LE(size, kMaxSpdyFrameSize);
shared_frame_->data = MakeSpdySerializedFrame(data, size);
}
SpdyBuffer::~SpdyBuffer() {
if (GetRemainingSize() > 0)
ConsumeHelper(GetRemainingSize(), DISCARD);
}
const char* SpdyBuffer::GetRemainingData() const {
return shared_frame_->data->data() + offset_;
}
size_t SpdyBuffer::GetRemainingSize() const {
return shared_frame_->data->size() - offset_;
}
void SpdyBuffer::AddConsumeCallback(const ConsumeCallback& consume_callback) {
consume_callbacks_.push_back(consume_callback);
}
void SpdyBuffer::Consume(size_t consume_size) {
ConsumeHelper(consume_size, CONSUME);
}
scoped_refptr<IOBuffer> SpdyBuffer::GetIOBufferForRemainingData() {
return base::MakeRefCounted<SharedFrameIOBuffer>(shared_frame_, offset_);
}
void SpdyBuffer::ConsumeHelper(size_t consume_size,
ConsumeSource consume_source) {
DCHECK_GE(consume_size, 1u);
DCHECK_LE(consume_size, GetRemainingSize());
offset_ += consume_size;
for (std::vector<ConsumeCallback>::const_iterator it =
consume_callbacks_.begin(); it != consume_callbacks_.end(); ++it) {
it->Run(consume_size, consume_source);
}
}
} // namespace net
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