/* CRC-32b version 1.03 by Craig Bruce, 27-Jan-94
**
** Based on "File Verification Using CRC" by Mark R. Nelson in Dr. Dobb's
** Journal, May 1992, pp. 64-67. This program DOES generate the same CRC
** values as ZMODEM and PKZIP
**
** v1.00: original release.
** v1.01: fixed printf formats.
** v1.02: fixed something else.
** v1.03: replaced CRC constant table by generator function.
*/
#include <stdio.h>
int main();
unsigned long getcrc();
void crcgen();
unsigned long crcTable[256];
/****************************************************************************/
int main( argc, argv )
	int argc;
	char *argv[];
{
	int	i;
	FILE *fp;
	unsigned long crc;
	crcgen();
	if (argc < 2) { crc = getcrc( stdin ); printf("crc32 = %08lx for <stdin>\n", crc);
	} else {
		for (i=1; i<argc; i++) { if ( (fp=fopen(argv[i],"rb")) == NULL ) { printf("error opening file \"%s\"!\n",argv[i]); } else { crc = getcrc( fp ); printf("crc32 = %08lx for \"%s\"\n", crc, argv[i]); fclose( fp ); } } } return( 0 ); } /****************************************************************************/ unsigned long getcrc( fp ) FILE *fp; { register unsigned long crc; int c; crc = 0xFFFFFFFF; while( (c=getc(fp)) != EOF ) { crc = ((crc>>8) & 0x00FFFFFF) ^ crcTable[ (crc^c) & 0xFF ];
	}
	return( crc^0xFFFFFFFF );
}
/****************************************************************************/
void crcgen( )
{
	unsigned long	crc, poly;
	int	i, j;
	poly = 0xEDB88320L;
	for (i=0; i<256; i++) { crc = i; for (j=8; j>0; j--) {
			if (crc&1) {
				crc = (crc>> 1) ^ poly;
			} else {
				crc>>= 1;
			}
		}
		crcTable[i] = crc;
	}
}
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