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// Copyright (c) 2010 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.
// MultipleArrayInputStream implements ZeroCopyInputStream to be used by
// protobuf to decode bytes into a protocol buffer message.
//
// This input stream is made of multiple IOBuffers received from the network.
// This object retains the IOBuffers added to it.
//
// Internally, we wrap each added IOBuffer in a DrainableIOBuffer. This allows
// us to track how much data has been consumed from each IOBuffer.
#ifndef REMOTING_BASE_MULTIPLE_ARRAY_INPUT_STREAM_H_
#define REMOTING_BASE_MULTIPLE_ARRAY_INPUT_STREAM_H_
#include <vector>
#include "base/basictypes.h"
#include "base/ref_counted.h"
#include "google/protobuf/io/zero_copy_stream.h"
namespace net {
class DrainableIOBuffer;
class IOBuffer;
} // namespace net
namespace remoting {
class MultipleArrayInputStream :
public google::protobuf::io::ZeroCopyInputStream {
public:
MultipleArrayInputStream();
virtual ~MultipleArrayInputStream();
// Add a buffer to the list. |buffer| is retained by this object.
void AddBuffer(net::IOBuffer* buffer, int size);
// google::protobuf::io::ZeroCopyInputStream interface.
virtual bool Next(const void** data, int* size);
virtual void BackUp(int count);
virtual bool Skip(int count);
virtual int64 ByteCount() const;
private:
std::vector<scoped_refptr<net::DrainableIOBuffer> > buffers_;
size_t current_buffer_;
int position_;
int last_returned_size_;
DISALLOW_COPY_AND_ASSIGN(MultipleArrayInputStream);
};
} // namespace remoting
#endif // REMOTING_BASE_MULTIPLE_ARRAY_INPUT_STREAM_H_
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