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/******************************************************************************
*
* swcomprs.h - class SWCompress: used for data
* compression
*
* $Id: swcomprs.h 3786 2020-08-30 11:35:14Z scribe $
*
* Copyright 1996-2014 CrossWire Bible Society (http://www.crosswire.org)
* CrossWire Bible Society
* P. O. Box 2528
* Tempe, AZ 85280-2528
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
*/
#ifndef SWCOMPRS_H
#define SWCOMPRS_H
#include <defs.h>
SWORD_NAMESPACE_START
class SWDLLEXPORT SWCompress {
private:
void init();
void cycleStream();
protected:
mutable char *buf, *zbuf, direct; // 0 - encode; 1 - decode
unsigned long zlen, zpos, pos, slen;
int level;
public:
SWCompress();
virtual ~SWCompress();
virtual void setUncompressedBuf(const char *buf = 0, unsigned long *len = 0);
virtual char *getUncompressedBuf(unsigned long *len = 0);
virtual void setCompressedBuf(unsigned long *len, char *buf = 0);
virtual char *getCompressedBuf(unsigned long *len = 0);
virtual unsigned long getChars(char *buf, unsigned long len); // override for other than buffer compression
virtual unsigned long sendChars(char *buf, unsigned long len); // override for other than buffer compression
virtual void encode(void); // override to provide compression algorythm
virtual void decode(void); // override to provide compression algorythm
virtual void setLevel(int l) {level = l;};
virtual int getLevel() {return level;};
};
SWORD_NAMESPACE_END
#endif
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