1 /*
2 * Copyright 2006 Serge van den Boom <svdb@stack.nl>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include "netplay.h"
20 // For DUMP_CRC_OPS
21
22 #include "crc.h"
23
24 #ifdef DUMP_CRC_OPS
25 # include "libs/log.h"
26 #endif
27
28
29 // CRC table for Polynomial 0x04c11db7 (0xedb88320 reversed)
30 uint32 crcTable[256] = {
31 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
32 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
33 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
34 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
35 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
36 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
37 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
38 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
39 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
40 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
41 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
42 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
43 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
44 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
45 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
46 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
47 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
48 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
49 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
50 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
51 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
52 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
53 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
54 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
55 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
56 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
57 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
58 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
59 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
60 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
61 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
62 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
63 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
64 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
65 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
66 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
67 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
68 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
69 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
70 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
71 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
72 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
73 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
74 };
75
76 void
crc_init(crc_State * state)77 crc_init(crc_State *state) {
78 state->crc = 0xffffffff;
79 }
80
81 void
crc_processBytes(crc_State * state,uint8 * buf,size_t bufLen)82 crc_processBytes(crc_State *state, uint8 *buf, size_t bufLen) {
83 uint8 *end = buf + bufLen;
84 uint32 newCrc = state->crc;
85
86 while (buf < end)
87 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ *buf) & 0xff];
88
89 #ifdef DUMP_CRC_OPS
90 crc_log("crc_processBytes(%08x, [%zu bytes]) --> %08x.",
91 state->crc, bufLen, newCrc);
92 #endif
93 state->crc = newCrc;
94 }
95
96 void
crc_processUint8(crc_State * state,uint8 val)97 crc_processUint8(crc_State *state, uint8 val) {
98 uint32 newCrc = state->crc;
99
100 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ val) & 0xff];
101 #ifdef DUMP_CRC_OPS
102 crc_log("crc_processUint8(%08x, %02x) --> %08x.",
103 state->crc, (int) val, newCrc);
104 #endif
105 state->crc = newCrc;
106 }
107
108 void
crc_processUint16(crc_State * state,uint16 val)109 crc_processUint16(crc_State *state, uint16 val) {
110 uint32 newCrc = state->crc;
111
112 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ (val & 0xff)) & 0xff];
113 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ (val >> 8) ) & 0xff];
114 #ifdef DUMP_CRC_OPS
115 crc_log("crc_processUint16(%08x, %04x) --> %08x.",
116 state->crc, (int) val, newCrc);
117 #endif
118 state->crc = newCrc;
119 }
120
121 void
crc_processUint32(crc_State * state,uint32 val)122 crc_processUint32(crc_State *state, uint32 val) {
123 uint32 newCrc = state->crc;
124
125 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ (val & 0xff)) & 0xff];
126 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ ((val >> 8) & 0xff)) & 0xff];
127 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ ((val >> 16) & 0xff)) & 0xff];
128 newCrc = (newCrc >> 8) ^ crcTable[(newCrc ^ ((val >> 24) )) & 0xff];
129
130 #ifdef DUMP_CRC_OPS
131 crc_log("crc_processUint32(%08x, %08x) --> %08x.",
132 state->crc, (int) val, newCrc);
133 #endif
134 state->crc = newCrc;
135 }
136
137 uint32
crc_finish(const crc_State * state)138 crc_finish(const crc_State *state) {
139 return ~state->crc;
140 }
141
142
143