Date: Mon, 22 Sep 1997 17:00:45 -0700 (PDT) From: Mike Meyer <mwm@shiva.the-park.com> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/4615: There is no 32-bit CRC in Freebsd. Message-ID: <199709230000.RAA02972@shiva.the-park.com> Resent-Message-ID: <199709240010.RAA15274@hub.freebsd.org>
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>Number: 4615
>Category: bin
>Synopsis: There is no 32-bit CRC in Freebsd.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Sep 23 17:10:01 PDT 1997
>Last-Modified:
>Originator: Mike Meyer
>Organization:
Meyer Consulting.
>Release: FreeBSD 2.2-STABLE i386
>Environment:
FreeBSD shiva.the-park.com 2.2-STABLE FreeBSD 2.2-STABLE #1: Thu Sep 18 19:59:4\2 PDT 1997 dima@shiva.the-park.com:/usr/src/sys/compile/THE_PARK i386
>Description:
There is no 32-bit CRC in FreeBSD. Not the 32-bit CRC that those
outside of Posix land use, anyway. This makes checking data
cross-platform - especially with legacy platforms - painfull.
>How-To-Repeat:
"man -k crc" and check all the programs that are listed for crcs
>Fix:
The attached patch file changes cksum to add "-o 3" to generate this
checksum for it's input.
diff -crN cksum/Makefile ncksum/Makefile
*** cksum/Makefile Tue Sep 23 10:15:36 1997
--- ncksum/Makefile Tue Sep 23 10:14:50 1997
***************
*** 1,6 ****
# @(#)Makefile 8.1 (Berkeley) 6/6/93
PROG= cksum
! SRCS= cksum.c crc.c print.c sum1.c sum2.c
.include <bsd.prog.mk>
--- 1,6 ----
# @(#)Makefile 8.1 (Berkeley) 6/6/93
PROG= cksum
! SRCS= cksum.c crc.c print.c sum1.c sum2.c crc32.c
.include <bsd.prog.mk>
diff -crN cksum/cksum.1 ncksum/cksum.1
*** cksum/cksum.1 Tue Sep 23 10:15:37 1997
--- ncksum/cksum.1 Tue Sep 23 10:14:50 1997
***************
*** 85,90 ****
--- 85,95 ----
s = sum of all bytes;
r = s % 2^16 + (s % 2^32) / 2^16;
cksum = (r % 2^16) + r / 2^16;
+ .Pp
+ Algorithm 3 is what is commonly called the
+ .q 32bit CRC
+ algorithm.
+ This is a 32-bit checksum.
.Ed
.Pp
Both algorithm 1 and 2 write to the standard output the same fields as
diff -crN cksum/cksum.c ncksum/cksum.c
*** cksum/cksum.c Tue Sep 23 10:15:37 1997
--- ncksum/cksum.c Tue Sep 23 10:14:50 1997
***************
*** 79,84 ****
--- 79,87 ----
} else if (*optarg == '2') {
cfncn = csum2;
pfncn = psum2;
+ } else if (*optarg == '3') {
+ cfncn = crc32;
+ pfncn = pcrc;
} else {
(void)fprintf(stderr,
"cksum: illegal argument to -o option\n");
diff -crN cksum/crc32.c ncksum/crc32.c
*** cksum/crc32.c Wed Dec 31 16:00:00 1969
--- ncksum/crc32.c Tue Sep 23 10:14:51 1997
***************
*** 0 ****
--- 1,115 ----
+ /*
+ * This code implements the AUTODIN II polynomial used by Ethernet,
+ * and can be used to calculate multicast address hash indices.
+ * It assumes that the low order bits will be transmitted first,
+ * and consequently the low byte should be sent first when
+ * the crc computation is finished. The crc should be complemented
+ * before transmission.
+ * The variable corresponding to the macro argument "crc" should
+ * be an unsigned long and should be preset to all ones for Ethernet
+ * use. An error-free packet will leave 0xDEBB20E3 in the crc.
+ * Spencer Garrett <srg@quick.com>
+ */
+
+ #define CRC(crc, ch) (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])
+
+ /* generated using the AUTODIN II polynomial
+ * 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 + 1
+ */
+ unsigned long crctab[256] = {
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
+ 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+ 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+ 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+ 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+ 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+ 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
+ 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+ 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+ 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+ 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
+ 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+ 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
+ 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+ 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+ 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
+ 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+ 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
+ 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+ 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+ 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+ 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
+ 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+ 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+ 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+ 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+ 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+ 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
+ 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
+ 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+ 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+ 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+ 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+ 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+ 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
+ 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+ 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+ 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+ 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
+ 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+ 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
+ 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+ 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+ 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
+ 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+ 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
+ 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+ 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+ 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+ 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
+ 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+ 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+ 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+ 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+ 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+ 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
+ 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
+ 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+ 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+ 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+ };
+
+ #include <stdio.h>
+ #include <sys/types.h>
+
+ u_long crc32_total = 0 ;
+
+ crc32(fd, cval, clen)
+ register int fd;
+ u_long *cval, *clen;
+ {
+ u_long crc = ~0;
+ char buf[BUFSIZ], *p ;
+ int len, nr ;
+ FILE *in;
+
+ len = 0 ;
+ crc32_total = ~crc32_total ;
+ while (nr = read(fd, buf, sizeof(buf)))
+ for (len += nr, p = buf; nr--; ++p) {
+ CRC(crc, *p) ;
+ CRC(crc32_total, *p) ;
+ }
+ if (nr < 0)
+ return 1 ;
+
+ *clen = len ;
+ *cval = ~crc ;
+ crc32_total = ~crc32_total ;
+ return 0 ;
+ }
diff -crN cksum/extern.h ncksum/extern.h
*** cksum/extern.h Tue Sep 23 10:15:37 1997
--- ncksum/extern.h Tue Sep 23 10:14:50 1997
***************
*** 42,45 ****
--- 42,46 ----
void psum2 __P((char *, unsigned long, unsigned long));
int csum1 __P((int, unsigned long *, unsigned long *));
int csum2 __P((int, unsigned long *, unsigned long *));
+ int crc32 __P((int, unsigned long *, unsigned long *));
__END_DECLS
>Audit-Trail:
>Unformatted:
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