GopherProxy

	cksum.c - sbase - suckless unix tools
	git clone git://git.suckless.org/sbase
	Log
	Files
	Refs
	README
	LICENSE
	---
	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 }