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/***********************************************************************CHDR**
* NAME: crc.h
*
* PURPOSE: Provides functions for calculating Cyclic Redundancy Checks
* (CRCs).
*
*****************************************************************************/
#ifndef INCLUDED_CRC
#define INCLUDED_CRC
/*****************************************************************************
* Internal constants
*****************************************************************************/
#define CRC_BITS_BYTE 8
#define CRC_BYTE_MASK 0xFF
#define CRC_UCHAR_MAX 255
/***********************************************************************EXDT**
* NAME: CRC_VAL
*
* PURPOSE: Holds the CRC 'register' during calculation and can be cast to
* an integer for output
*
*****************************************************************************/
typedef unsigned int CRC_VAL;
/***********************************************************************EXDT**
* NAME: CRC_BOOL
*
* PURPOSE: True / false boolean value
*
*****************************************************************************/
typedef int CRC_BOOL;
#define CRC_TRUE 1
#define CRC_FALSE 0
/***********************************************************************EXDT**
* NAME: CRC_TBL
*
* PURPOSE: Stores CRC the parameters and look-up table required for doing
* the CRC calculation
*
*****************************************************************************/
typedef struct crc_tbl
{
CRC_VAL pre_calc[CRC_UCHAR_MAX + 1];
int width;
CRC_VAL poly;
CRC_VAL init_val;
CRC_VAL xor_out;
CRC_BOOL is_rev;
} CRC_TBL;
/***********************************************************************EXCN**
* NAME: CRC_STD_*
*
* PURPOSE: Constants to identify standard varieties of CRCs
*
*****************************************************************************/
#define CRC_STD_CRC16 0
#define CRC_DNP_CRC16 1
#define CRC_MOD_CRC16 2
#define CRC_STD_XMODEM 3
#define CRC_STD_ZMODEM16 4
#define CRC_STD_CRC32 5
#define CRC_STD_JAM 6
/*****************************************************************************
* Function prototypes
*****************************************************************************/
CRC_BOOL crc_mk_tbl(CRC_TBL*, int, CRC_VAL, CRC_VAL, CRC_VAL, int);
CRC_BOOL crc_mk_std_tbl(CRC_TBL*, int);
CRC_VAL crc_final(CRC_VAL*, CRC_TBL*);
void crc_init(CRC_VAL*, CRC_TBL*);
void crc_add_chr(CRC_VAL*, CRC_TBL*, unsigned char, int);
void crc_add_str(CRC_VAL*, CRC_TBL*, unsigned char*);
void crc_add_data(CRC_VAL*, CRC_TBL*, unsigned char*, int);
#endif
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