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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/spdy/spdy_buffer.h"
#include <cstring>
#include "base/callback.h"
#include "base/logging.h"
#include "net/base/io_buffer.h"
#include "net/spdy/spdy_protocol.h"
namespace net {
namespace {
// Makes a SpdyFrame with |size| bytes of data copied from
// |data|. |data| must be non-NULL and |size| must be positive.
scoped_ptr<SpdyFrame> MakeSpdyFrame(const char* data, size_t size) {
DCHECK(data);
DCHECK_GT(size, 0u);
scoped_ptr<char[]> frame_data(new char[size]);
std::memcpy(frame_data.get(), data, size);
scoped_ptr<SpdyFrame> frame(
new SpdyFrame(frame_data.release(), size, true /* owns_buffer */));
return frame.Pass();
}
} // 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(shared_frame->data->data() + offset),
shared_frame_(shared_frame),
offset_(offset) {}
private:
virtual ~SharedFrameIOBuffer() {
// Prevent ~IOBuffer() from trying to delete |data_|.
data_ = NULL;
}
const scoped_refptr<SharedFrame> shared_frame_;
const size_t offset_;
DISALLOW_COPY_AND_ASSIGN(SharedFrameIOBuffer);
};
SpdyBuffer::SpdyBuffer(scoped_ptr<SpdyFrame> frame)
: shared_frame_(new SharedFrame()),
offset_(0) {
shared_frame_->data = frame.Pass();
}
// 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_(new SharedFrame()),
offset_(0) {
shared_frame_->data = MakeSpdyFrame(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);
};
IOBuffer* SpdyBuffer::GetIOBufferForRemainingData() {
return new 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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