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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
//
// GzCompressor compresses a byte stream using gzip compression
// calling the client's ProcessBytes() method with the compressed stream
//
#ifndef O3D_IMPORT_CROSS_GZ_COMPRESSOR_H_
#define O3D_IMPORT_CROSS_GZ_COMPRESSOR_H_
#include "base/basictypes.h"
#include "zlib.h"
#include "import/cross/memory_stream.h"
namespace o3d {
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class GzCompressor : public StreamProcessor {
public:
explicit GzCompressor(StreamProcessor *callback_client);
virtual ~GzCompressor();
virtual Status ProcessBytes(MemoryReadStream *stream,
size_t bytes_to_process);
// Must call when all bytes to compress have been sent (with ProcessBytes)
virtual void Close(bool success);
private:
Status CompressBytes(MemoryReadStream *stream,
size_t bytes_to_process,
bool flush);
z_stream strm_; // low-level zlib state
bool initialized_;
bool stream_is_closed_;
StreamProcessor *callback_client_;
DISALLOW_COPY_AND_ASSIGN(GzCompressor);
};
} // namespace o3d
#endif // O3D_IMPORT_CROSS_GZ_COMPRESSOR_H_
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