AOO410/main/tools/inc/tools/zcodec.hxx

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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
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 * 
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#ifndef _ZCODEC_HXX
#define _ZCODEC_HXX

#include "tools/toolsdllapi.h"
#include <tools/solar.h>

// -----------
// - Defines -
// -----------

#define DEFAULT_IN_BUFSIZE			(0x00008000UL)
#define DEFAULT_OUT_BUFSIZE			(0x00008000UL)

#define MAX_MEM_USAGE 8

//
// memory requirement using compress:
//	[ INBUFFER ] + [ OUTBUFFER ] + 128KB + 1 << (MEM_USAGE+9)
//
// memory requirement using decompress:
//	[ INBUFFER ] + [ OUTBUFFER ] + 32KB
//

#define ZCODEC_NO_COMPRESSION		(0x00000000UL)
#define ZCODEC_BEST_SPEED			(0x00000001UL)
#define	ZCODEC_DEFAULT_COMPRESSION	(0x00000006UL)
#define ZCODEC_BEST_COMPRESSION		(0x00000009UL)

#define ZCODEC_DEFAULT_STRATEGY		(0x00000000UL)
#define ZCODEC_ZFILTERED			(0x00000100UL)
#define ZCODEC_ZHUFFMAN_ONLY		(0x00000200UL)

#define ZCODEC_UPDATE_CRC			(0x00010000UL)
#define ZCODEC_GZ_LIB				(0x00020000UL)

#define ZCODEC_PNG_DEFAULT ( ZCODEC_NO_COMPRESSION | ZCODEC_DEFAULT_STRATEGY | ZCODEC_UPDATE_CRC )
#define ZCODEC_DEFAULT	( ZCODEC_DEFAULT_COMPRESSION | ZCODEC_DEFAULT_STRATEGY )

// ----------
// - ZCodec -
// ----------

class SvStream;

class TOOLS_DLLPUBLIC ZCodec
{
private:

	sal_uIntPtr			mbInit;
	sal_Bool			mbStatus;
	sal_Bool			mbFinish;
	sal_uIntPtr			mnMemUsage;
	SvStream*		mpIStm;
	sal_uInt8*			mpInBuf;
	sal_uIntPtr			mnInBufSize;
	sal_uIntPtr			mnInToRead;
	SvStream*		mpOStm;
    sal_uInt8*			mpOutBuf;
	sal_uIntPtr			mnOutBufSize;

	sal_uIntPtr			mnCRC;
	sal_uIntPtr			mnCompressMethod;
	void*			mpsC_Stream;

	void			ImplInitBuf( sal_Bool nIOFlag );
	void			ImplWriteBack( void );

public:	
					ZCodec( sal_uIntPtr nInBuf, sal_uIntPtr nOutBuf, sal_uIntPtr nMemUsage = MAX_MEM_USAGE );
					ZCodec( void );	
	virtual			~ZCodec();

	virtual void	BeginCompression( sal_uIntPtr nCompressMethod = ZCODEC_DEFAULT );
	virtual long	EndCompression();
	sal_Bool            IsFinished () const { return mbFinish; }

	long			Compress( SvStream& rIStm, SvStream& rOStm );
	long			Decompress( SvStream& rIStm, SvStream& rOStm );

	long			Write( SvStream& rOStm, const sal_uInt8* pData, sal_uIntPtr nSize );
	long			Read( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );
	long			ReadAsynchron( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );

	void			SetBreak( sal_uIntPtr );
	sal_uIntPtr			GetBreak( void );
	void			SetCRC( sal_uIntPtr nCurrentCRC );
	sal_uIntPtr			UpdateCRC( sal_uIntPtr nLatestCRC, sal_uIntPtr nSource );	
	sal_uIntPtr			UpdateCRC( sal_uIntPtr nLatestCRC, sal_uInt8* pSource, long nDatSize );
	sal_uIntPtr			GetCRC();
};

class GZCodec : public ZCodec
{

public:
					GZCodec(){};
					~GZCodec(){};
	virtual void	BeginCompression( sal_uIntPtr nCompressMethod = ZCODEC_DEFAULT );
};

#endif // _ZCODEC_HXX