From Jesper Peterson:
[obnox/wireshark/wip.git] / crc32.c
1 /* crc32.c
2  * CRC-32 routine
3  *
4  * $Id: crc32.c,v 1.2 2003/08/26 05:52:43 guy Exp $
5  *
6  * Ethereal - Network traffic analyzer
7  * By Gerald Combs <gerald@ethereal.com>
8  * Copyright 1998 Gerald Combs
9  *
10  * Copied from README.developer
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License
14  * as published by the Free Software Foundation; either version 2
15  * of the License, or (at your option) any later version.
16  *
17  * This program 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
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25  *
26  * Credits:
27  *
28  * Table from Solomon Peachy
29  * Routine from Chris Waters
30  */
31
32 #include <glib.h>
33 #include "crc32.h"
34
35 /*
36  * Table for the AUTODIN/HDLC/802.x CRC.
37  *
38  * Polynomial is
39  *
40  *      x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^8 + x^7 +
41  *          x^5 + x^4 + x^2 + x + 1
42  */
43 const guint32 crc32_table[256] = {
44         0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
45         0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
46         0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
47         0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
48         0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
49         0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
50         0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
51         0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
52         0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
53         0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
54         0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
55         0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
56         0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
57         0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
58         0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
59         0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
60         0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
61         0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
62         0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
63         0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
64         0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
65         0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
66         0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
67         0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
68         0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
69         0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
70         0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
71         0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
72         0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
73         0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
74         0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
75         0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
76         0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
77         0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
78         0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
79         0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
80         0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
81         0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
82         0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
83         0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
84         0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
85         0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
86         0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
87         0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
88         0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
89         0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
90         0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
91         0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
92         0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
93         0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
94         0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
95         0x2d02ef8d
96 };
97
98 guint32
99 crc32(const unsigned char* buf, unsigned int len)
100 {
101   unsigned int i;
102   guint32 crc32 = 0xFFFFFFFF;
103
104   for (i = 0; i < len; i++)
105     crc32 = crc32_table[(crc32 ^ buf[i]) & 0xff] ^ (crc32 >> 8);
106
107   return ( ~crc32 );
108 }
109
110 /*
111  * IEEE 802.x version (Ethernet and 802.11, at least) - byte-swap
112  * the result of "crc32()".
113  *
114  * XXX - does this mean we should fetch the Ethernet and 802.11
115  * FCS with "tvb_get_letohl()" rather than "tvb_get_ntohl()",
116  * or is fetching it big-endian and byte-swapping the CRC done
117  * to cope with 802.x sending stuff out in reverse bit order?
118  */
119 guint32
120 crc32_802(const unsigned char* buf, unsigned int len)
121 {
122   guint32 c_crc;
123
124   c_crc = crc32(buf, len);
125
126   /* Byte reverse. */
127   c_crc = ((unsigned char)(c_crc>>0)<<24) |
128     ((unsigned char)(c_crc>>8)<<16) |
129     ((unsigned char)(c_crc>>16)<<8) |
130     ((unsigned char)(c_crc>>24)<<0);
131
132   return ( c_crc );
133 }