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[mLib] / hash / crc32.c
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0875b58f 1/* -*-c-*-
2 *
0875b58f 3 * Calculating cyclic redundancy values (non-cryptographic!)
4 *
5 * (c) 1998 Straylight/Edgeware
6 */
7
d4efbcd9 8/*----- Licensing notice --------------------------------------------------*
0875b58f 9 *
10 * This file is part of the mLib utilities library.
11 *
12 * mLib is free software; you can redistribute it and/or modify
c846879c 13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
d4efbcd9 16 *
0875b58f 17 * mLib is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c846879c 20 * GNU Library General Public License for more details.
d4efbcd9 21 *
c846879c 22 * You should have received a copy of the GNU Library General Public
0bd98442 23 * License along with mLib; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * MA 02111-1307, USA.
0875b58f 26 */
27
0875b58f 28/*----- Header files ------------------------------------------------------*/
29
30/* --- ANSI headers --- */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35
36/* --- Local headers --- */
37
7b4b46a7 38#include "bits.h"
0875b58f 39#include "crc32.h"
40
0875b58f 41/*----- Functionc provided ------------------------------------------------*/
42
43/* --- @crc32@ --- *
44 *
7b4b46a7 45 * Arguments: @uint32 crc@ = carryover from previous call, or zero
0875b58f 46 * @const void *buf@ = pointer to buffer to check
47 * @size_t sz@ = size of the buffer
48 *
49 * Returns: The CRC updated by the new buffer.
50 *
51 * Use: A restartable CRC calculator. This is just a function
52 * wrapper for the macro version.
53 */
54
7b4b46a7 55uint32 crc32(uint32 crc, const void *buf, size_t sz)
0875b58f 56{
7b4b46a7 57 uint32 c;
0875b58f 58 CRC32(c, crc, buf, sz);
59 return (c);
60}
61
62/*----- Test driver -------------------------------------------------------*/
63
64#ifdef TEST_RIG
65
66#include <stdio.h>
67
68int main(void)
69{
7b4b46a7 70 uint32 crc = 0;
0875b58f 71 char buf[BUFSIZ];
72 int r;
73
74 do {
75 r = fread(buf, 1, sizeof(buf), stdin);
76 if (r > 0)
77 crc = crc32(crc, buf, r);
78 } while (r == sizeof(buf));
79
7b4b46a7 80 printf("crc32(stdin) = %08lx\n", (unsigned long)crc);
0875b58f 81 return (0);
82}
83
84#endif
85
86/*----- That's all, folks -------------------------------------------------*/