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