4 * $Id: crc32.c 18197 2006-05-21 05:12:17Z sahlberg $
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * Copied from README.developer
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.
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.
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.
28 * Table from Solomon Peachy
29 * Routine from Chris Waters
32 #include "qemu/osdep.h"
33 #include "atheros_wlan_crc32.h"
36 * Table for the AUTODIN/HDLC/802.x CRC.
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
43 const guint32 crc32_ccitt_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,
98 #define CRC32_CCITT_SEED 0xFFFFFFFF
101 crc32_ccitt(const guint8
*buf
, guint len
)
103 return crc32_ccitt_seed(buf
, len
, CRC32_CCITT_SEED
);
107 crc32_ccitt_seed(const guint8
*buf
, guint len
, guint32 seed
)
110 guint32 crc32
= seed
;
112 for (i
= 0; i
< len
; i
++) {
113 crc32
= crc32_ccitt_table
[(crc32
^ buf
[i
]) & 0xff] ^ (crc32
>> 8);
121 * Checksum routine for Internet Protocol family headers (Portable Version).
123 * This routine is very heavily used in the network
124 * code and should be modified for each CPU to be as fast as possible.
127 #define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
128 #define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; ADDCARRY(sum);}
131 in_cksum(const vec_t
*vec
, int veclen
)
133 register const guint16
*w
;
134 register int sum
= 0;
135 register int mlen
= 0;
136 int byte_swapped
= 0;
147 for (; veclen
!= 0; vec
++, veclen
--) {
151 w
= (const guint16
*)vec
->ptr
;
154 * The first byte of this chunk is the continuation
155 * of a word spanning between this chunk and the
158 * s_util.c[0] is already saved when scanning previous
161 s_util
.c
[1] = *(const guint8
*)w
;
163 w
= (const guint16
*)((const guint8
*)w
+ 1);
169 * Force to even boundary.
171 if ((1 & (unsigned long) w
) && (mlen
> 0)) {
174 s_util
.c
[0] = *(const guint8
*)w
;
175 w
= (const guint16
*)((const guint8
*)w
+ 1);
180 * Unroll the loop to make overhead from
183 while ((mlen
-= 32) >= 0) {
203 while ((mlen
-= 8) >= 0) {
211 if (mlen
== 0 && byte_swapped
== 0) {
215 while ((mlen
-= 2) >= 0) {
223 s_util
.c
[1] = *(const guint8
*)w
;
229 } else if (mlen
== -1) {
230 s_util
.c
[0] = *(const guint8
*)w
;
234 /* The last mbuf has odd # of bytes. Follow the
235 standard (the odd byte may be shifted left by 8 bits
236 or not as determined by endian-ness of the machine) */
241 return ~sum
& 0xffff;
244 guint16
ip_checksum(const guint8
*ptr
, int len
)
248 cksum_vec
[0].ptr
= ptr
;
249 cksum_vec
[0].len
= len
;
250 return in_cksum(&cksum_vec
[0], 1);