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// Copyright 2017 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 <stdint.h>
#include "base/macros.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "net/base/io_buffer.h"
namespace content {
// These adapters are used to transfer data between a Mojo pipe and the net
// library.
// Mojo pipe Data flow Network library
// ----------------------------------------------------------
// NetToMojoPendingBuffer <--- NetToMojoIOBuffer
// While the operation is in progress, the Mojo-side objects keep ownership
// of the Mojo pipe, which in turn is kept alive by the IOBuffer. This allows
// the request to potentially outlive the object managing the translation.
// Mojo side of a Net -> Mojo copy. The buffer is allocated by Mojo.
class NetToMojoPendingBuffer
: public base::RefCountedThreadSafe<NetToMojoPendingBuffer> {
// Begins a two-phase write to the data pipe.
// On success, MOJO_RESULT_OK will be returned. The ownership of the given
// producer handle will be transferred to the new NetToMojoPendingBuffer that
// will be placed into *pending, and the size of the buffer will be in
// *num_bytes.
// On failure or MOJO_RESULT_SHOULD_WAIT, there will be no change to the
// handle, and *pending and *num_bytes will be unused.
static MojoResult BeginWrite(mojo::ScopedDataPipeProducerHandle* handle,
scoped_refptr<NetToMojoPendingBuffer>* pending,
uint32_t* num_bytes);
// Called to indicate the buffer is done being written to. Passes ownership
// of the pipe back to the caller.
mojo::ScopedDataPipeProducerHandle Complete(uint32_t num_bytes);
char* buffer() { return static_cast<char*>(buffer_); }
friend class base::RefCountedThreadSafe<NetToMojoPendingBuffer>;
// Takes ownership of the handle.
NetToMojoPendingBuffer(mojo::ScopedDataPipeProducerHandle handle,
void* buffer);
mojo::ScopedDataPipeProducerHandle handle_;
void* buffer_;
// Net side of a Net -> Mojo copy. The data will be read from the network and
// copied into the buffer associated with the pending mojo write.
class NetToMojoIOBuffer : public net::WrappedIOBuffer {
// If |offset| is specified then the memory buffer passed to the Net layer
// will be offset by that many bytes.
NetToMojoIOBuffer(NetToMojoPendingBuffer* pending_buffer, int offset = 0);
~NetToMojoIOBuffer() override;
scoped_refptr<NetToMojoPendingBuffer> pending_buffer_;
} // namespace content