1*433d6423SLionel Sambuc /* Compute checksum Author: Johan W. Stevenson */
2*433d6423SLionel Sambuc
3*433d6423SLionel Sambuc /* Copyright 1988 by Johan W. Stevenson */
4*433d6423SLionel Sambuc
5*433d6423SLionel Sambuc #include <stdlib.h>
6*433d6423SLionel Sambuc #include <string.h>
7*433d6423SLionel Sambuc #include <stdio.h>
8*433d6423SLionel Sambuc #include <string.h>
9*433d6423SLionel Sambuc #include <errno.h>
10*433d6423SLionel Sambuc
11*433d6423SLionel Sambuc int errs;
12*433d6423SLionel Sambuc
13*433d6423SLionel Sambuc #if __STDC__
14*433d6423SLionel Sambuc int main(int argc, char **argv);
15*433d6423SLionel Sambuc void crc(char *fname);
16*433d6423SLionel Sambuc #else
17*433d6423SLionel Sambuc void crc();
18*433d6423SLionel Sambuc #endif
19*433d6423SLionel Sambuc
main(int argc,char ** argv)20*433d6423SLionel Sambuc int main(int argc, char **argv)
21*433d6423SLionel Sambuc {
22*433d6423SLionel Sambuc char line[256];
23*433d6423SLionel Sambuc
24*433d6423SLionel Sambuc if (argc <= 1)
25*433d6423SLionel Sambuc crc((char *) 0);
26*433d6423SLionel Sambuc else if (argc == 2 && strcmp(argv[1], "-") == 0)
27*433d6423SLionel Sambuc while (fgets(line, sizeof line, stdin) != NULL) {
28*433d6423SLionel Sambuc if (line[strlen(line) - 1] == '\n')
29*433d6423SLionel Sambuc line[strlen(line) - 1] = '\0';
30*433d6423SLionel Sambuc crc(line);
31*433d6423SLionel Sambuc }
32*433d6423SLionel Sambuc else
33*433d6423SLionel Sambuc do {
34*433d6423SLionel Sambuc crc(argv[1]);
35*433d6423SLionel Sambuc argv++;
36*433d6423SLionel Sambuc argc--;
37*433d6423SLionel Sambuc } while (argc > 1);
38*433d6423SLionel Sambuc return(errs != 0);
39*433d6423SLionel Sambuc }
40*433d6423SLionel Sambuc
41*433d6423SLionel Sambuc /* Crctab calculated by Mark G. Mendel, Network Systems Corporation */
42*433d6423SLionel Sambuc static unsigned short crctab[256] = {
43*433d6423SLionel Sambuc 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
44*433d6423SLionel Sambuc 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
45*433d6423SLionel Sambuc 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
46*433d6423SLionel Sambuc 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
47*433d6423SLionel Sambuc 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
48*433d6423SLionel Sambuc 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
49*433d6423SLionel Sambuc 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
50*433d6423SLionel Sambuc 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
51*433d6423SLionel Sambuc 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
52*433d6423SLionel Sambuc 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
53*433d6423SLionel Sambuc 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
54*433d6423SLionel Sambuc 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
55*433d6423SLionel Sambuc 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
56*433d6423SLionel Sambuc 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
57*433d6423SLionel Sambuc 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
58*433d6423SLionel Sambuc 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
59*433d6423SLionel Sambuc 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
60*433d6423SLionel Sambuc 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
61*433d6423SLionel Sambuc 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
62*433d6423SLionel Sambuc 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
63*433d6423SLionel Sambuc 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
64*433d6423SLionel Sambuc 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
65*433d6423SLionel Sambuc 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
66*433d6423SLionel Sambuc 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
67*433d6423SLionel Sambuc 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
68*433d6423SLionel Sambuc 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
69*433d6423SLionel Sambuc 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
70*433d6423SLionel Sambuc 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
71*433d6423SLionel Sambuc 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
72*433d6423SLionel Sambuc 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
73*433d6423SLionel Sambuc 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
74*433d6423SLionel Sambuc 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
75*433d6423SLionel Sambuc };
76*433d6423SLionel Sambuc
77*433d6423SLionel Sambuc /* Updcrc macro derived from article Copyright (C) 1986 Stephen Satchell.
78*433d6423SLionel Sambuc * NOTE: First argument must be in range 0 to 255.
79*433d6423SLionel Sambuc * Second argument is referenced twice.
80*433d6423SLionel Sambuc *
81*433d6423SLionel Sambuc * Programmers may incorporate any or all code into their programs,
82*433d6423SLionel Sambuc * giving proper credit within the source. Publication of the
83*433d6423SLionel Sambuc * source routines is permitted so long as proper credit is given
84*433d6423SLionel Sambuc * to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
85*433d6423SLionel Sambuc * Omen Technology.
86*433d6423SLionel Sambuc */
87*433d6423SLionel Sambuc
88*433d6423SLionel Sambuc #define updcrc(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
89*433d6423SLionel Sambuc
crc(char * fname)90*433d6423SLionel Sambuc void crc(char *fname)
91*433d6423SLionel Sambuc {
92*433d6423SLionel Sambuc register int c;
93*433d6423SLionel Sambuc register long len = 0;
94*433d6423SLionel Sambuc register unsigned short crc = 0;
95*433d6423SLionel Sambuc register FILE *fp;
96*433d6423SLionel Sambuc
97*433d6423SLionel Sambuc if (fname == NULL)
98*433d6423SLionel Sambuc fp = stdin;
99*433d6423SLionel Sambuc else if ((fp = fopen(fname, "r")) == NULL) {
100*433d6423SLionel Sambuc fprintf(stderr, "crc: Can't open %s: %s\n", fname, strerror(errno));
101*433d6423SLionel Sambuc errs++;
102*433d6423SLionel Sambuc return;
103*433d6423SLionel Sambuc }
104*433d6423SLionel Sambuc while ((c = getc(fp)) != EOF) {
105*433d6423SLionel Sambuc len++;
106*433d6423SLionel Sambuc crc = updcrc(c, crc);
107*433d6423SLionel Sambuc }
108*433d6423SLionel Sambuc printf("%05u %6ld", crc, len);
109*433d6423SLionel Sambuc if (fname) {
110*433d6423SLionel Sambuc printf(" %s", fname);
111*433d6423SLionel Sambuc fclose(fp);
112*433d6423SLionel Sambuc }
113*433d6423SLionel Sambuc printf("\n");
114*433d6423SLionel Sambuc }
115