/*************************************************************************
* (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
* by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: aitcrc.h,v 1.3 2010/06/13 16:13:51 misho Exp $
*
*************************************************************************/
#ifndef __AITCRC_H
#define __AITCRC_H
#include <sys/types.h>
#define REVOPTS_REVERTBYTE 1
#define REVOPTS_REVERTCRC 2
struct tagCRCPoly {
u_char poly_bits;
u_int poly_num;
char poly_name[19];
}; // size 24bytes
typedef struct tagCRCPoly crcPoly_t;
// -------------------------------------------------------
// crc_GetErrno() Get error code of last operation
inline int crc_GetErrno();
// crc_GetError() Get error text of last operation
inline const char *crc_GetError();
// -------------------------------------------------------
/*
* crcReflect() Reflect all bits of number
* @crcNum = Number for reflection
* @crcBits = Number width bits
* return: -1 error, !=-1 reflecting number
*/
inline u_int crcReflect(u_int crcNum, u_char crcBits);
/*
* crcCalc() Generic CRC calculation function for many sub variants of CRC algorithms
* @psBuf = Data for calculation
* @bufLen = Length of data
* @crcBits = CRC algorithm bits (1, 4, 5, 6, 7, 8, 10, 11, 12, 15, 16, 24, 30, 32)
* @RevOpts = Options for computation (REVOPTS_REVERTBYTE, REVOPTS_REVERTCRC)
* @initCRC = Initial CRC value
* @xorCRC = Last xor CRC value
* return: -1 error, !=-1 CRC checksum
*/
inline u_int crcCalc(u_char * __restrict psBuf, u_int bufLen, u_char crcBits,
u_char RevOpts, u_int initCRC, u_int xorCRC);
/*
* crcIP() Checksum in IP communication
* @nBuf = Data for calculation
* @bufLen = Length of data
* return: -1 error, !=-1 Checksum
*/
inline u_short crcIP(u_short * __restrict nBuf, int bufLen);
/*
* crcFletcher16() Fletcher-16 Checksum computing
* @nBuf = Data for calculation
* @bufLen = Length of data
* return: -1 error, !=-1 Checksum
*/
inline u_short crcFletcher16(u_short * __restrict nBuf, int bufLen);
/*
* crcFletcher() Fletcher-32 Checksum computing
* @nBuf = Data for calculation
* @bufLen = Length of data
* return: -1 error, !=-1 Checksum
*/
inline u_int crcFletcher(u_short * __restrict nBuf, int bufLen);
/*
* crcAdler() crcAdler-32 Checksum computing
* @psBuf = Data for calculation
* @bufLen = Length of data
* return: -1 error, !=-1 Checksum
*/
inline u_int crcAdler(u_char * __restrict psBuf, int bufLen);
/*
* crcEther() Checksum in Ethernet communication
* @psBuf = Data for calculation
* @bufLen = Length of data
* return: -1 error, !=-1 Checksum
*/
#define crcEther(psBuf, bufLen) crcCalc((psBuf), (bufLen), 32, 3, 0xFFFFFFFF, 0xFFFFFFFF)
/*
* crcPelco() Calculate Pelco D/P CRC
* @ver = Pelco protocol version (Dd | Pp)
* @pkt = Packet for calculate crc
* return: crc for packet, if is 0 check and crc_GetErrno() == 1
Pelco protocol not supported
*/
inline u_char crcPelco(u_char ver, u_char *pkt);
#endif
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