Line data Source code
1 : /**
2 : r_crc32.c
3 :
4 :
5 : Copyright (C) 2002-2003, Network Resonance, Inc.
6 : Copyright (C) 2006, Network Resonance, Inc.
7 : All Rights Reserved
8 :
9 : Redistribution and use in source and binary forms, with or without
10 : modification, are permitted provided that the following conditions
11 : are met:
12 :
13 : 1. Redistributions of source code must retain the above copyright
14 : notice, this list of conditions and the following disclaimer.
15 : 2. Redistributions in binary form must reproduce the above copyright
16 : notice, this list of conditions and the following disclaimer in the
17 : documentation and/or other materials provided with the distribution.
18 : 3. Neither the name of Network Resonance, Inc. nor the name of any
19 : contributors to this software may be used to endorse or promote
20 : products derived from this software without specific prior written
21 : permission.
22 :
23 : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
24 : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 : POSSIBILITY OF SUCH DAMAGE.
34 :
35 :
36 : */
37 :
38 : /**
39 : crc32.c
40 :
41 : Copyright (C) 2003, RTFM, Inc.
42 : All Rights Reserved.
43 :
44 : ekr@rtfm.com Fri Jan 31 13:57:43 2003
45 :
46 : THE FOLLOWING CODE WAS EXTRACTED FROM FreeBSD
47 : The comment below was the original header
48 :
49 : The main function was modified to process a buffer
50 : rather than a file
51 : */
52 :
53 : /*
54 : * This code implements the AUTODIN II polynomial used by Ethernet,
55 : * and can be used to calculate multicast address hash indices.
56 : * It assumes that the low order bits will be transmitted first,
57 : * and consequently the low byte should be sent first when
58 : * the crc computation is finished. The crc should be complemented
59 : * before transmission.
60 : * The variable corresponding to the macro argument "crc" should
61 : * be an unsigned long and should be preset to all ones for Ethernet
62 : * use. An error-free packet will leave 0xDEBB20E3 in the crc.
63 : * Spencer Garrett <srg@quick.com>
64 : */
65 :
66 :
67 : #include <sys/types.h>
68 : #include <r_types.h>
69 :
70 : static char *RCSSTRING __UNUSED__ ="$Id: r_crc32.c,v 1.4 2008/11/26 03:22:02 adamcain Exp $";
71 :
72 : #ifdef WIN32
73 : #define u_int32_t UINT4
74 : #endif
75 :
76 : #define CRC(crc, ch) (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])
77 :
78 : /* generated using the AUTODIN II polynomial
79 : * x^32 + x^26 + x^23 + x^22 + x^16 +
80 : * x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
81 : */
82 : static const u_int32_t crctab[256] = {
83 : 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
84 : 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
85 : 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
86 : 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
87 : 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
88 : 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
89 : 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
90 : 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
91 : 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
92 : 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
93 : 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
94 : 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
95 : 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
96 : 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
97 : 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
98 : 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
99 : 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
100 : 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
101 : 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
102 : 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
103 : 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
104 : 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
105 : 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
106 : 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
107 : 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
108 : 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
109 : 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
110 : 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
111 : 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
112 : 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
113 : 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
114 : 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
115 : 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
116 : 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
117 : 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
118 : 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
119 : 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
120 : 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
121 : 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
122 : 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
123 : 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
124 : 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
125 : 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
126 : 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
127 : 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
128 : 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
129 : 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
130 : 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
131 : 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
132 : 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
133 : 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
134 : 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
135 : 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
136 : 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
137 : 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
138 : 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
139 : 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
140 : 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
141 : 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
142 : 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
143 : 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
144 : 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
145 : 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
146 : 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
147 : };
148 :
149 : #include <stdio.h>
150 : #include <sys/types.h>
151 :
152 :
153 : int r_crc32 (char *buf,int dlen,u_int32_t *cval);
154 :
155 : int
156 0 : r_crc32(buf, dlen, cval)
157 : char *buf;
158 : int dlen;
159 : u_int32_t *cval;
160 : {
161 0 : u_int32_t crc = ~0;
162 : char *p ;
163 : int i;
164 0 : u_int32_t crc32_total = 0 ;
165 :
166 0 : p=buf;
167 :
168 0 : for(i=0;i<dlen;i++){
169 0 : CRC(crc, *p) ;
170 0 : CRC(crc32_total, *p) ;
171 0 : p++;
172 : }
173 :
174 0 : *cval = ~crc ;
175 :
176 0 : return 0 ;
177 : }
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