0875b58f |
1 | /* -*-c-*- |
2 | * |
b7580524 |
3 | * $Id: crc32.c,v 1.5 2000/07/21 19:01:33 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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: crc32.c,v $ |
b7580524 |
33 | * Revision 1.5 2000/07/21 19:01:33 mdw |
34 | * Generate the CRC table rather than hardcoding it. |
35 | * |
7b4b46a7 |
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'. |
38 | * |
0bd98442 |
39 | * Revision 1.3 1999/05/06 19:51:35 mdw |
40 | * Reformatted the LGPL notice a little bit. |
41 | * |
c846879c |
42 | * Revision 1.2 1999/05/05 18:50:31 mdw |
43 | * Change licensing conditions to LGPL. |
44 | * |
45 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
46 | * Initial version of mLib |
0875b58f |
47 | * |
48 | */ |
49 | |
50 | /*----- Header files ------------------------------------------------------*/ |
51 | |
52 | /* --- ANSI headers --- */ |
53 | |
54 | #include <stdio.h> |
55 | #include <stdlib.h> |
56 | #include <string.h> |
57 | |
58 | /* --- Local headers --- */ |
59 | |
7b4b46a7 |
60 | #include "bits.h" |
0875b58f |
61 | #include "crc32.h" |
62 | |
0875b58f |
63 | /*----- Functionc provided ------------------------------------------------*/ |
64 | |
65 | /* --- @crc32@ --- * |
66 | * |
7b4b46a7 |
67 | * Arguments: @uint32 crc@ = carryover from previous call, or zero |
0875b58f |
68 | * @const void *buf@ = pointer to buffer to check |
69 | * @size_t sz@ = size of the buffer |
70 | * |
71 | * Returns: The CRC updated by the new buffer. |
72 | * |
73 | * Use: A restartable CRC calculator. This is just a function |
74 | * wrapper for the macro version. |
75 | */ |
76 | |
7b4b46a7 |
77 | uint32 crc32(uint32 crc, const void *buf, size_t sz) |
0875b58f |
78 | { |
7b4b46a7 |
79 | uint32 c; |
0875b58f |
80 | CRC32(c, crc, buf, sz); |
81 | return (c); |
82 | } |
83 | |
84 | /*----- Test driver -------------------------------------------------------*/ |
85 | |
86 | #ifdef TEST_RIG |
87 | |
88 | #include <stdio.h> |
89 | |
90 | int main(void) |
91 | { |
7b4b46a7 |
92 | uint32 crc = 0; |
0875b58f |
93 | char buf[BUFSIZ]; |
94 | int r; |
95 | |
96 | do { |
97 | r = fread(buf, 1, sizeof(buf), stdin); |
98 | if (r > 0) |
99 | crc = crc32(crc, buf, r); |
100 | } while (r == sizeof(buf)); |
101 | |
7b4b46a7 |
102 | printf("crc32(stdin) = %08lx\n", (unsigned long)crc); |
0875b58f |
103 | return (0); |
104 | } |
105 | |
106 | #endif |
107 | |
108 | /*----- That's all, folks -------------------------------------------------*/ |