#ifndef __CRC_H__
#define __CRC_H__
/*
 * $Id: crc.h,v 1.6 1993/12/08 13:58:56 edvkai Exp $
 *
 * Copyright (C) 1986 Gary S. Brown.  You may use this program, or
 * code or tables extracted from it, as desired without restriction.
 *
 * $Log: crc.h,v $
 * Revision 1.6  1993/12/08 13:58:56  edvkai
 * Removed false RCSids from log.
 *
 * Revision 1.5  1993/08/04  12:15:26  edvkai
 * C++
 *
 * Revision 1.4  1992/02/14  18:07:54  ak
 * *** empty log message ***
 *
 * Revision 1.3  1992/01/03  14:19:08  ak
 *
 * Revision 1.2  1992/01/03  13:44:45  ak
 * Zortech fixes.
 *
 * Revision 1.1.1.1  1991/12/12  16:09:55  ak
 * Initial checkin of server source, modified to contain RCS IDs.
 *
 * Revision 1.1  1991/12/12  16:09:51  ak
 * Initial revision
 *
 */

 /**********************************************************************\
|*								      *|
|* Library functions to compute the 32-bit CRC used as the frame      *|
|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71     *|
|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level     *|
|* protocol).  The 32-bit FCS was added via the Federal Register,     *|
|* 1 June 1982, p.23798.  I presume but don't know for certain that   *|
|* this polynomial is or will be included in CCITT V.41, which	      *|
|* defines the 16-bit CRC (often called CRC-CCITT) polynomial.	FIPS  *|
|* PUB 78 says that the 32-bit FCS reduces otherwise undetected       *|
|* errors by a factor of 10^-5 over 16-bit FCS. 		      *|
|*								      *|
\**********************************************************************/

#ifdef __cplusplus
   extern "C" {
#endif

/* Need an unsigned type capable of holding 32 bits; */
typedef unsigned long int UNS_32_BITS;

extern const UNS_32_BITS crc_32_tab[];

		/* initialize crc to 0xFFFFFFFFuL */
#define crc32_byte(octet, crc) (crc_32_tab[((crc)^(octet)) & 0xff] ^ ((crc)>>8))
extern UNS_32_BITS crc32(void *ptr, unsigned len, UNS_32_BITS crc);

#ifdef __cplusplus
   }
#endif

#endif