swcomprs.h

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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