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/*
* Copyright (C) 2007-2019 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_DEFLATE_H
#define BU_DEFLATE_H
#include <stdint.h>
#include "bu/filter.h"
namespace Bu
{
/**
* Provides Deflate (LZ77) support via zlib. This provides zlib, raw, and
* gzip stream types. By default it will autodetect the input type and
* encode into a raw deflate stream.
*
*@ingroup Streams
*@ingroup Compression
*/
class Deflate : public Bu::Filter
{
public:
enum Format
{
Raw = 0x01,
Zlib = 0x02,
Gzip = 0x03,
AutoDetect = 0x04,
AutoRaw = 0x04|0x01,
AutoZlib = 0x04|0x02,
AutoGzip = 0x04|0x03
};
Deflate( Bu::Stream &rNext, int nCompression=-1, Format eFmt=AutoZlib );
virtual ~Deflate();
virtual void start();
virtual Bu::size stop();
virtual Bu::size read( void *pBuf, Bu::size nBytes );
virtual Bu::size write( const void *pBuf, Bu::size nBytes );
virtual bool isOpen();
virtual bool isEos();
Bu::size getCompressedSize();
private:
void zError( int code );
void *prState;
bool bReading;
int nCompression;
char *pBuf;
uint32_t nBufSize;
Bu::size sTotalOut;
Format eFmt;
bool bEos;
};
}
#endif
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