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swcomprs.h

/******************************************************************************
 *  swcomprs.h   - definition of Class SWCompress used for data compression
 *
 * $Id: swcomprs_8h-source.html,v 1.9 2002/10/31 11:30:16 joachim Exp $
 *
 * Copyright 1998 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
{
  void Init ();
  void cycleStream ();
protected:
  char *buf, *zbuf, direct;     // 0 - encode; 1 - decode
  unsigned long zlen, zpos, pos, slen;
public:
    SWCompress ();
    virtual ~ SWCompress ();
  virtual char *Buf (const char *buf = 0, unsigned long *len = 0);
  virtual char *zBuf (unsigned long *len, char *buf = 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
};

SWORD_NAMESPACE_END
#endif

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