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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_COMPRESSOR_H_
#define REMOTING_BASE_COMPRESSOR_H_
#include "base/basictypes.h"
namespace remoting {
// An object to compress data losslessly. Compressed data can be fully
// recovered by a Decompressor.
//
// Note that a Compressor can only be used on one stream during its
// lifetime. This object should be destroyed after use.
class Compressor {
public:
// Defines the flush modes for a compressor.
enum CompressorFlush {
CompressorNoFlush,
CompressorSyncFlush,
CompressorFinish,
};
virtual ~Compressor() {}
// Resets all the internal state so the compressor behaves as if it
// was just created.
virtual void Reset() = 0;
// Compress |input_data| with |input_size| bytes.
//
// |output_data| is provided by the caller and |output_size| is the
// size of |output_data|. |output_size| must be greater than 0.
//
// |flush| is set to one of the three value:
// - CompressorNoFlush
// No flushing is requested
// - CompressorSyncFlush
// Write all pending output and write a synchronization point in the
// output data stream.
// - CompressorFinish
// Mark the end of stream.
//
// Compressed data is written to |output_data|. |consumed| will
// contain the number of bytes consumed from the input. |written|
// contains the number of bytes written to output.
//
// Returns true if this method needs to be called again because
// there is more data to be written out. This is particularly
// useful for end of the compression stream.
virtual bool Process(const uint8* input_data, int input_size,
uint8* output_data, int output_size,
CompressorFlush flush, int* consumed, int* written) = 0;
};
} // namespace remoting
#endif // REMOTING_BASE_COMPRESSOR_H_
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