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[mLib] / crc32.c
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0875b58f 1/* -*-c-*-
2 *
8656dc50 3 * $Id: crc32.c,v 1.6 2004/04/08 01:36:11 mdw Exp $
0875b58f 4 *
5 * Calculating cyclic redundancy values (non-cryptographic!)
6 *
7 * (c) 1998 Straylight/Edgeware
8 */
9
c846879c 10/*----- Licensing notice --------------------------------------------------*
0875b58f 11 *
12 * This file is part of the mLib utilities library.
13 *
14 * mLib is free software; you can redistribute it and/or modify
c846879c 15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
18 *
0875b58f 19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c846879c 22 * GNU Library General Public License for more details.
23 *
24 * You should have received a copy of the GNU Library General Public
0bd98442 25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
27 * MA 02111-1307, USA.
0875b58f 28 */
29
0875b58f 30/*----- Header files ------------------------------------------------------*/
31
32/* --- ANSI headers --- */
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37
38/* --- Local headers --- */
39
7b4b46a7 40#include "bits.h"
0875b58f 41#include "crc32.h"
42
0875b58f 43/*----- Functionc provided ------------------------------------------------*/
44
45/* --- @crc32@ --- *
46 *
7b4b46a7 47 * Arguments: @uint32 crc@ = carryover from previous call, or zero
0875b58f 48 * @const void *buf@ = pointer to buffer to check
49 * @size_t sz@ = size of the buffer
50 *
51 * Returns: The CRC updated by the new buffer.
52 *
53 * Use: A restartable CRC calculator. This is just a function
54 * wrapper for the macro version.
55 */
56
7b4b46a7 57uint32 crc32(uint32 crc, const void *buf, size_t sz)
0875b58f 58{
7b4b46a7 59 uint32 c;
0875b58f 60 CRC32(c, crc, buf, sz);
61 return (c);
62}
63
64/*----- Test driver -------------------------------------------------------*/
65
66#ifdef TEST_RIG
67
68#include <stdio.h>
69
70int main(void)
71{
7b4b46a7 72 uint32 crc = 0;
0875b58f 73 char buf[BUFSIZ];
74 int r;
75
76 do {
77 r = fread(buf, 1, sizeof(buf), stdin);
78 if (r > 0)
79 crc = crc32(crc, buf, r);
80 } while (r == sizeof(buf));
81
7b4b46a7 82 printf("crc32(stdin) = %08lx\n", (unsigned long)crc);
0875b58f 83 return (0);
84}
85
86#endif
87
88/*----- That's all, folks -------------------------------------------------*/