<![CDATA[// +++Date last modified: 05-Jul-1997
/*
** CRC Calculator by Paul Johnston
** Version 1.0 Copyright 10/9/96 (September)
** Explicitly released to the public domain 30-Oct-1996 by the author
*/
/* Custom Hungarian types:
**
** crp - CRC Polynomial
** crgi - CRC reGister Inital value
** crxo - CRC Xor Out value
** crpt - CRC Precalculated Table
** crr - is CRC Reversed
** crst - CRC Standard Type
*/
#ifndef PAJ_CRC
#define PAJ_CRC
class PData {
public:
unsigned long l;
void *pData;
};
unsigned long Reflect(unsigned long toref, char w);
enum Crst {
Crc16=0,
Crc32,
JamCrc,
XModemCrc,
ZModemCrc16,
ZModemCrc32
};
class CheckCalc {
public:
virtual unsigned long Add (unsigned long crc, char *sCrc)=0;
virtual unsigned long Add (unsigned long crc, unsigned char sCrc)=0;
virtual unsigned long Add (unsigned long crc, PData sCrc)=0;
virtual unsigned long Init()=0;
};
class CrcCalc : CheckCalc {
private:
unsigned long acrpt[256], crp, crgi, crxo;
unsigned char fcrr, crwd;
void InitCalc (unsigned long crpNew, unsigned long crgiNew,
unsigned long crxoNew, unsigned char fcrrNew,
unsigned char crwdNew);
public:
unsigned long Add (unsigned long crc, char *sCrc);
unsigned long Add (unsigned long crc, unsigned char sCrc);
unsigned long Add (unsigned long crc, PData sCrc);
unsigned long Init();
CrcCalc (unsigned long crpNew, unsigned long crgiNew=0,
unsigned long crxoNew=0, unsigned char fcrrNew=1,
unsigned char crwdNew=32);
CrcCalc (Crst crst);
};
class Crc {
private:
unsigned long crc;
CheckCalc *crccalc;
public:
unsigned long crcGet() { return crc; };
void Add (char *sCrc) { crc=crccalc->Add(crc, sCrc); }
void Add (char sCrc) { crc=crccalc->Add(crc, sCrc); }
void Add (PData sCrc) { crc=crccalc->Add(crc, sCrc); }
void NewCrc () { crc=crccalc->Init(); }
operator unsigned long () { return crcGet(); }
void operator << (char *sCrc) { Add(sCrc); }
void operator << (char sCrc) { Add(sCrc); }
void operator << (PData sCrc) { Add(sCrc); }
void operator = (int iNew) { if (iNew==0) NewCrc(); }
Crc(CheckCalc *crccalcNew) { crccalc=crccalcNew; NewCrc(); }
};
#endif // PAJ_CRC
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