/* FILE: crc.h */

#ifndef CRC_H_INCLUDED
#define CRC_H_INCLUDED 1

/* define only one of the following... */
//#define CRC8
//#define CRC10
//#define CRC16
//#define X25
//#define XMODEM
//#define MILSTD188
//#define AUTODINII

/* The following typedef's should be adjusted for the particular platform. */
typedef unsigned char  UINT8;
typedef unsigned short UINT16;
typedef unsigned long  UINT32;


/*
 * CRC-8     x^8  + x^2 + x + 1
 * CRC-10    x^10 + x^9 + x^5 + x^4 + x + 1
 * CRC-16    x^16 + x^15 + x^2 + 1
 * X.25      x^16 + x^12 + x^5 + 1
 * XMODEM    x^16 + x^12 + x^5 + 1 (reflected/reversed)
 * MILSTD188 x^24+x^23+x^18+x^17+x^14+x^11+x^10+x^7+x^6+x^5+x^4+x^3+x+1
 * AUTODINII x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1
 */


#ifdef CRC8
#define POLY       0x0107
#define CRC_INIT   0x00
typedef UINT8      CRC_TYPE;
#endif

#ifdef CRC10
#define POLY       0x0633
#define CRC_INIT   0x0000
typedef UINT16     CRC_TYPE;
#endif

#ifdef CRC16
#define POLY       0xa001
#define CRC_INIT   0x0000
typedef UINT16     CRC_TYPE;
#endif

#ifdef X25
#define POLY       0x8408
#define CRC_INIT   0xffff
typedef UINT16     CRC_TYPE;
#endif

#ifdef XMODEM
#define POLY       0x1021
#define CRC_INIT   0x0000
typedef UINT16     CRC_TYPE;
#endif

#ifdef MILSTD188
#define POLY       0x00df3261L
#define CRC_INIT   0x00000000L
typedef UINT32     CRC_TYPE;
#endif

#ifdef AUTODINII
#define POLY       0xedb88320L
#define CRC_INIT   0xffffffffL
typedef UINT32     CRC_TYPE;
#endif


/* prototypes */
extern CRC_TYPE crc( unsigned char *ptr, register int len );


#endif  /* end of ifndef CRC_H_INCLUDED */