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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: crc32.c,v 1.3 1999/05/06 19:51:35 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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: crc32.c,v $ |
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33 | * Revision 1.3 1999/05/06 19:51:35 mdw |
34 | * Reformatted the LGPL notice a little bit. |
35 | * |
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36 | * Revision 1.2 1999/05/05 18:50:31 mdw |
37 | * Change licensing conditions to LGPL. |
38 | * |
39 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
40 | * Initial version of mLib |
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41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | /* --- ANSI headers --- */ |
47 | |
48 | #include <stdio.h> |
49 | #include <stdlib.h> |
50 | #include <string.h> |
51 | |
52 | /* --- Local headers --- */ |
53 | |
54 | #include "crc32.h" |
55 | |
56 | /*----- CRC table ---------------------------------------------------------*/ |
57 | |
58 | /* --- Acknowledgements and information --- * |
59 | * |
60 | * This table was generated using a derivative of the Rocksoft Model CRC |
61 | * generator. The parameters given are: |
62 | * |
63 | * width = 32bits |
64 | * poly = 0x04C11DB7 |
65 | * init = -1 |
66 | * xorout = -1 |
67 | * reverse = yes |
68 | * check = crc(123456789) = 0xCBF43926 |
69 | */ |
70 | |
71 | unsigned long crc32_table[256] = { |
72 | 0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL, |
73 | 0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L, |
74 | 0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L, |
75 | 0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L, |
76 | 0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL, |
77 | 0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L, |
78 | 0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL, |
79 | 0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L, |
80 | 0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L, |
81 | 0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL, |
82 | 0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L, |
83 | 0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L, |
84 | 0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L, |
85 | 0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL, |
86 | 0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L, |
87 | 0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL, |
88 | 0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL, |
89 | 0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L, |
90 | 0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L, |
91 | 0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L, |
92 | 0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL, |
93 | 0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L, |
94 | 0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL, |
95 | 0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L, |
96 | 0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L, |
97 | 0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL, |
98 | 0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L, |
99 | 0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L, |
100 | 0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L, |
101 | 0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL, |
102 | 0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L, |
103 | 0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL, |
104 | 0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL, |
105 | 0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L, |
106 | 0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L, |
107 | 0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L, |
108 | 0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL, |
109 | 0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L, |
110 | 0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL, |
111 | 0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L, |
112 | 0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L, |
113 | 0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL, |
114 | 0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L, |
115 | 0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L, |
116 | 0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L, |
117 | 0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL, |
118 | 0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L, |
119 | 0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL, |
120 | 0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL, |
121 | 0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L, |
122 | 0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L, |
123 | 0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L, |
124 | 0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL, |
125 | 0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L, |
126 | 0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL, |
127 | 0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L, |
128 | 0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L, |
129 | 0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL, |
130 | 0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L, |
131 | 0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L, |
132 | 0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L, |
133 | 0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL, |
134 | 0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L, |
135 | 0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL, |
136 | }; |
137 | |
138 | /*----- Functionc provided ------------------------------------------------*/ |
139 | |
140 | /* --- @crc32@ --- * |
141 | * |
142 | * Arguments: @unsigned long crc@ = carryover from previous call, or zero |
143 | * @const void *buf@ = pointer to buffer to check |
144 | * @size_t sz@ = size of the buffer |
145 | * |
146 | * Returns: The CRC updated by the new buffer. |
147 | * |
148 | * Use: A restartable CRC calculator. This is just a function |
149 | * wrapper for the macro version. |
150 | */ |
151 | |
152 | unsigned long crc32(unsigned long crc, const void *buf, size_t sz) |
153 | { |
154 | unsigned long c; |
155 | CRC32(c, crc, buf, sz); |
156 | return (c); |
157 | } |
158 | |
159 | /*----- Test driver -------------------------------------------------------*/ |
160 | |
161 | #ifdef TEST_RIG |
162 | |
163 | #include <stdio.h> |
164 | |
165 | int main(void) |
166 | { |
167 | unsigned long crc = 0; |
168 | char buf[BUFSIZ]; |
169 | int r; |
170 | |
171 | do { |
172 | r = fread(buf, 1, sizeof(buf), stdin); |
173 | if (r > 0) |
174 | crc = crc32(crc, buf, r); |
175 | } while (r == sizeof(buf)); |
176 | |
177 | printf("crc32(stdin) = %08lx\n", crc); |
178 | return (0); |
179 | } |
180 | |
181 | #endif |
182 | |
183 | /*----- That's all, folks -------------------------------------------------*/ |