3 * $Id: crc32.c,v 1.6 2004/04/08 01:36:11 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 /*----- Header files ------------------------------------------------------*/
32 /* --- ANSI headers --- */
38 /* --- Local headers --- */
43 /*----- Functionc provided ------------------------------------------------*/
47 * Arguments: @uint32 crc@ = carryover from previous call, or zero
48 * @const void *buf@ = pointer to buffer to check
49 * @size_t sz@ = size of the buffer
51 * Returns: The CRC updated by the new buffer.
53 * Use: A restartable CRC calculator. This is just a function
54 * wrapper for the macro version.
57 uint32
crc32(uint32 crc
, const void *buf
, size_t sz
)
60 CRC32(c
, crc
, buf
, sz
);
64 /*----- Test driver -------------------------------------------------------*/
77 r
= fread(buf
, 1, sizeof(buf
), stdin
);
79 crc
= crc32(crc
, buf
, r
);
80 } while (r
== sizeof(buf
));
82 printf("crc32(stdin) = %08lx\n", (unsigned long)crc
);
88 /*----- That's all, folks -------------------------------------------------*/