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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.
#ifndef REMOTING_BASE_MULTIPLE_ARRAY_INPUT_STREAM_H_
#define REMOTING_BASE_MULTIPLE_ARRAY_INPUT_STREAM_H_
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "google/protobuf/io/zero_copy_stream.h"
namespace remoting {
// A MultipleArrayInputStream provides a ZeroCopyInputStream with multiple
// backing arrays.
class MultipleArrayInputStream :
public google::protobuf::io::ZeroCopyInputStream {
public:
// Construct a MultipleArrayInputStream with |count| backing arrays.
// TODO(hclam): Consider adding block size to see if it has a performance
// gain.
explicit MultipleArrayInputStream(int count);
virtual ~MultipleArrayInputStream();
virtual bool Next(const void** data, int* size);
virtual void BackUp(int count);
virtual bool Skip(int count);
virtual int64 ByteCount() const;
// Set the n-th buffer to be |buffer|.
void SetBuffer(int n, const uint8* buffer, int size);
private:
scoped_array<const uint8*> buffers_;
scoped_array<int> buffer_sizes_;
const int buffer_count_;
int current_buffer_;
int current_buffer_offset_;
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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