Add canonical 32bit crc as alorithm 3.
PR: 4615 Reviewed by: phk Submitted by: Mike Meyer <mwm@shiva.the-park.com>
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=29868
@ -1,7 +1,7 @@
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# @(#)Makefile 8.2 (Berkeley) 4/28/95
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PROG= cksum
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SRCS= cksum.c crc.c print.c sum1.c sum2.c
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SRCS= cksum.c crc.c print.c sum1.c sum2.c crc32.c
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LINKS= ${BINDIR}/cksum ${BINDIR}/sum
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MLINKS= cksum.1 sum.1
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@ -33,7 +33,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)cksum.1 8.2 (Berkeley) 4/28/95
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.\" $Id: cksum.1,v 1.4 1997/06/25 07:02:00 charnier Exp $
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.\" $Id: cksum.1,v 1.5 1997/07/06 03:03:06 bde Exp $
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.\"
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.Dd April 28, 1995
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.Dt CKSUM 1
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@ -98,6 +98,11 @@ r = s % 2^16 + (s % 2^32) / 2^16;
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cksum = (r % 2^16) + r / 2^16;
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.Ed
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.Pp
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Algorithm 3 is what is commonly called the
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.Ql 32bit CRC
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algorithm.
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This is a 32-bit checksum.
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.Pp
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Both algorithm 1 and 2 write to the standard output the same fields as
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the default algorithm except that the size of the file in bytes is
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replaced with the size of the file in blocks.
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@ -45,7 +45,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)cksum.c 8.2 (Berkeley) 4/28/95";
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#endif
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static const char rcsid[] =
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"$Id$";
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"$Id: cksum.c,v 1.5 1997/07/06 03:18:13 bde Exp $";
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#endif /* not lint */
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#include <sys/cdefs.h>
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@ -95,6 +95,9 @@ main(argc, argv)
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} else if (!strcmp(optarg, "2")) {
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cfncn = csum2;
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pfncn = psum2;
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} else if (*optarg == '3') {
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cfncn = crc32;
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pfncn = pcrc;
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} else {
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warnx("illegal argument to -o option");
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usage();
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115
usr.bin/cksum/crc32.c
Normal file
115
usr.bin/cksum/crc32.c
Normal file
@ -0,0 +1,115 @@
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/*
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* This code implements the AUTODIN II polynomial used by Ethernet,
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* and can be used to calculate multicast address hash indices.
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* It assumes that the low order bits will be transmitted first,
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* and consequently the low byte should be sent first when
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* the crc computation is finished. The crc should be complemented
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* before transmission.
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* The variable corresponding to the macro argument "crc" should
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* be an unsigned long and should be preset to all ones for Ethernet
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* use. An error-free packet will leave 0xDEBB20E3 in the crc.
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* Spencer Garrett <srg@quick.com>
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*/
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#define CRC(crc, ch) (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])
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/* generated using the AUTODIN II polynomial
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* x^32 + x^26 + x^23 + x^22 + x^16 +
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* x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
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*/
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unsigned long crctab[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
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0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
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0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
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0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
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0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
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0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
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0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
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};
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#include <stdio.h>
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#include <sys/types.h>
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u_long crc32_total = 0 ;
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crc32(fd, cval, clen)
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register int fd;
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u_long *cval, *clen;
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{
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u_long crc = ~0;
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char buf[BUFSIZ], *p ;
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int len, nr ;
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FILE *in;
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len = 0 ;
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crc32_total = ~crc32_total ;
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while (nr = read(fd, buf, sizeof(buf)))
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for (len += nr, p = buf; nr--; ++p) {
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CRC(crc, *p) ;
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CRC(crc32_total, *p) ;
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}
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if (nr < 0)
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return 1 ;
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*clen = len ;
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*cval = ~crc ;
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crc32_total = ~crc32_total ;
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return 0 ;
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}
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@ -42,4 +42,5 @@ void psum1 __P((char *, unsigned long, unsigned long));
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void psum2 __P((char *, unsigned long, unsigned long));
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int csum1 __P((int, unsigned long *, unsigned long *));
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int csum2 __P((int, unsigned long *, unsigned long *));
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int crc32 __P((int, unsigned long *, unsigned long *));
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__END_DECLS
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