sbase

suckless unix tools
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cksum.c (4375B)

      1 /* See LICENSE file for copyright and license details. */
      2 #include <fcntl.h>
      3 #include <inttypes.h>
      4 #include <stdio.h>
      5 #include <string.h>
      6 #include <unistd.h>
      7 
      8 #include "util.h"
      9 
     10 static int ret = 0;
     11 static const unsigned long crctab[] = {         0x00000000,
     12 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
     13 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
     14 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
     15 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
     16 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
     17 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
     18 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
     19 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
     20 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
     21 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
     22 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
     23 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
     24 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
     25 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
     26 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
     27 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
     28 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
     29 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
     30 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
     31 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
     32 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
     33 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
     34 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
     35 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
     36 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
     37 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
     38 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
     39 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
     40 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
     41 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
     42 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
     43 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
     44 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
     45 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
     46 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
     47 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
     48 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
     49 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
     50 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
     51 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
     52 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
     53 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
     54 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
     55 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
     56 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
     57 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
     58 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
     59 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
     60 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
     61 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
     62 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
     63 };
     64 
     65 static void
     66 cksum(int fd, const char *s)
     67 {
     68 	ssize_t n;
     69 	size_t len = 0, i;
     70 	uint32_t ck = 0;
     71 	unsigned char buf[BUFSIZ];
     72 
     73 	while ((n = read(fd, buf, sizeof(buf))) > 0) {
     74 		for (i = 0; i < n; i++)
     75 			ck = (ck << 8) ^ crctab[(ck >> 24) ^ buf[i]];
     76 		len += n;
     77 	}
     78 	if (n < 0) {
     79 		weprintf("read %s:", s ? s : "<stdin>");
     80 		ret = 1;
     81 		return;
     82 	}
     83 
     84 	for (i = len; i; i >>= 8)
     85 		ck = (ck << 8) ^ crctab[(ck >> 24) ^ (i & 0xFF)];
     86 
     87 	printf("%"PRIu32" %zu", ~ck, len);
     88 	if (s) {
     89 		putchar(' ');
     90 		fputs(s, stdout);
     91 	}
     92 	putchar('\n');
     93 }
     94 
     95 static void
     96 usage(void)
     97 {
     98 	eprintf("usage: %s [file ...]\n", argv0);
     99 }
    100 
    101 int
    102 main(int argc, char *argv[])
    103 {
    104 	int fd;
    105 
    106 	ARGBEGIN {
    107 	default:
    108 		usage();
    109 	} ARGEND
    110 
    111 	if (!argc) {
    112 		cksum(0, NULL);
    113 	} else {
    114 		for (; *argv; argc--, argv++) {
    115 			if (!strcmp(*argv, "-")) {
    116 				*argv = "<stdin>";
    117 				fd = 0;
    118 			} else if ((fd = open(*argv, O_RDONLY)) < 0) {
    119 				weprintf("open %s:", *argv);
    120 				ret = 1;
    121 				continue;
    122 			}
    123 			cksum(fd, *argv);
    124 			if (fd != 0)
    125 				close(fd);
    126 		}
    127 	}
    128 
    129 	ret |= fshut(stdout, "<stdout>");
    130 
    131 	return ret;
    132 }