3 * $Id: crc32.c,v 1.5 2000/07/21 19:01:33 mdw Exp $
5 * Calculating cyclic redundancy values (non-cryptographic!)
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
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.
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
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.5 2000/07/21 19:01:33 mdw
34 * Generate the CRC table rather than hardcoding it.
36 * Revision 1.4 1999/06/01 09:47:22 mdw
37 * Make the return type of `crc32' a `uint32' now that we have `bits.h'.
39 * Revision 1.3 1999/05/06 19:51:35 mdw
40 * Reformatted the LGPL notice a little bit.
42 * Revision 1.2 1999/05/05 18:50:31 mdw
43 * Change licensing conditions to LGPL.
45 * Revision 1.1.1.1 1998/06/17 23:44:42 mdw
46 * Initial version of mLib
50 /*----- Header files ------------------------------------------------------*/
52 /* --- ANSI headers --- */
58 /* --- Local headers --- */
63 /*----- Functionc provided ------------------------------------------------*/
67 * Arguments: @uint32 crc@ = carryover from previous call, or zero
68 * @const void *buf@ = pointer to buffer to check
69 * @size_t sz@ = size of the buffer
71 * Returns: The CRC updated by the new buffer.
73 * Use: A restartable CRC calculator. This is just a function
74 * wrapper for the macro version.
77 uint32 crc32(uint32 crc, const void *buf, size_t sz)
80 CRC32(c, crc, buf, sz);
84 /*----- Test driver -------------------------------------------------------*/
97 r = fread(buf, 1, sizeof(buf), stdin);
99 crc = crc32(crc, buf, r);
100 } while (r == sizeof(buf));
102 printf("crc32(stdin) = %08lx\n", (unsigned long)crc);
108 /*----- That's all, folks -------------------------------------------------*/