johan@nlgvax.UUCP (Johan Stevenson) (11/28/88)
This message contains a shar wrapping of the following files:
$ crc *
49516 3650 crc.c
This is a slightly updated upwards-compatible version of the crc.c
posted earlier for MINIX-PC. This new one will work on MINIX-PC as well.
The binary /usr/bin/crc has been posted before (patch #6).
Go to an empty directory, feed the lines following the cut mark
to the shell, check the table above with the output of /usr/bin/crc
and install as follows:
$ cp * /usr/src/commands
$ cd /usr/src/commands
$ cc -O -DATARI_ST crc.c -o crc
$ cmp crc /usr/bin/crc
Good luck.
--
Johan W. Stevenson johan@pcg.philips.nl Philips Research
------------------------------------------------------------------------
: This is a shar archive. Extract with sh, not csh.
: This archive ends with exit, so do not worry about trailing junk.
echo 'Extracting crc.c'
sed 's/^X//' > crc.c << '+ END-OF-FILE crc.c'
X/*
X * Tabulate file CRC checksum and length
X *
X * Author: Johan W. Stevenson
X */
X#include <stdio.h>
X
Xint errs;
X
Xmain(argc,argv)
Xchar **argv;
X{
X char line[256];
X
X if (argc <= 1)
X crc((char *)0);
X else if (argc == 2 && strcmp(argv[1], "-") == 0)
X while (fgets(line, sizeof line, stdin) != NULL) {
X line[strlen(line) - 1] = '\0';
X crc(line);
X }
X else
X do {
X crc(argv[1]);
X argv++;
X argc--;
X } while (argc > 1);
X exit(errs != 0);
X}
X
X/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
Xstatic unsigned short crctab[256] = {
X 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
X 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
X 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
X 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
X 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
X 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
X 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
X 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
X 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
X 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
X 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
X 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
X 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
X 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
X 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
X 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
X 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
X 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
X 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
X 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
X 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
X 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
X 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
X 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
X 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
X 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
X 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
X 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
X 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
X 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
X 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
X 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
X};
X
X/*
X * updcrc macro derived from article Copyright (C) 1986 Stephen Satchell.
X * NOTE: First argument must be in range 0 to 255.
X * Second argument is referenced twice.
X *
X * Programmers may incorporate any or all code into their programs,
X * giving proper credit within the source. Publication of the
X * source routines is permitted so long as proper credit is given
X * to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
X * Omen Technology.
X */
X
X#define updcrc(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
X
Xcrc(fname)
Xchar *fname;
X{
X register int c;
X register int i;
X register long len = 0;
X register unsigned short crc = 0;
X register FILE *fp;
X
X if (fname == NULL)
X fp = stdin;
X else if ((fp = fopen(fname, "r")) == NULL) {
X fprintf(stderr, "crc: cannot open %s\n", fname);
X errs++;
X return;
X }
X while ((c = getc(fp)) != EOF) {
X len++;
X crc = updcrc(c, crc);
X }
X printf("%05u %6ld", crc, len);
X if (fname) {
X printf(" %s", fname);
X fclose(fp);
X }
X printf("\n");
X}
+ END-OF-FILE crc.c
chmod 644 crc.c
echo 'CRC SENT: 49516 3650 crc.c'
echo -n 'CRC RCVD: '
crc crc.c
exit 0