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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: crc32.c,v 1.6 2004/04/08 01:36:11 mdw Exp $ |
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4 | * |
5 | * Calculating cyclic redundancy values (non-cryptographic!) |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of the mLib utilities library. |
13 | * |
14 | * mLib is free software; you can redistribute it and/or modify |
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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 | * |
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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 |
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22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
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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. |
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28 | */ |
29 | |
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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 | |
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40 | #include "bits.h" |
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41 | #include "crc32.h" |
42 | |
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43 | /*----- Functionc provided ------------------------------------------------*/ |
44 | |
45 | /* --- @crc32@ --- * |
46 | * |
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47 | * Arguments: @uint32 crc@ = carryover from previous call, or zero |
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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 | |
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57 | uint32 crc32(uint32 crc, const void *buf, size_t sz) |
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58 | { |
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59 | uint32 c; |
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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 | |
70 | int main(void) |
71 | { |
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72 | uint32 crc = 0; |
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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 | |
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82 | printf("crc32(stdin) = %08lx\n", (unsigned long)crc); |
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83 | return (0); |
84 | } |
85 | |
86 | #endif |
87 | |
88 | /*----- That's all, folks -------------------------------------------------*/ |