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1 | /* |
2 | * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved. | |
3 | * | |
4 | * This software may be freely used, copied, modified, and distributed | |
5 | * provided that the above copyright notice is preserved in all copies of the | |
6 | * software. | |
7 | */ | |
8 | ||
9 | /* -*-C-*- | |
10 | * | |
11 | * $Revision$ | |
12 | * $Date$ | |
13 | * | |
14 | * | |
15 | * crc.c - provides some "standard" CRC calculation routines. | |
16 | * | |
17 | */ | |
18 | #include "crc.h" /* describes this code */ | |
19 | ||
20 | /**********************************************************************/ | |
21 | ||
22 | /* | |
23 | * crc32 IEEE-802.3 32bit CRC | |
24 | * ----- -------------------- | |
25 | */ | |
26 | ||
27 | /* This table was generated by the "crctable" program */ | |
28 | static const unsigned int crc32table[256] = { | |
29 | /* 0x00 */ 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, | |
30 | /* 0x04 */ 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, | |
31 | /* 0x08 */ 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, | |
32 | /* 0x0C */ 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, | |
33 | /* 0x10 */ 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, | |
34 | /* 0x14 */ 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, | |
35 | /* 0x18 */ 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, | |
36 | /* 0x1C */ 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, | |
37 | /* 0x20 */ 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, | |
38 | /* 0x24 */ 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, | |
39 | /* 0x28 */ 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, | |
40 | /* 0x2C */ 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, | |
41 | /* 0x30 */ 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, | |
42 | /* 0x34 */ 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, | |
43 | /* 0x38 */ 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, | |
44 | /* 0x3C */ 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, | |
45 | /* 0x40 */ 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, | |
46 | /* 0x44 */ 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, | |
47 | /* 0x48 */ 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, | |
48 | /* 0x4C */ 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, | |
49 | /* 0x50 */ 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, | |
50 | /* 0x54 */ 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, | |
51 | /* 0x58 */ 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, | |
52 | /* 0x5C */ 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, | |
53 | /* 0x60 */ 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, | |
54 | /* 0x64 */ 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, | |
55 | /* 0x68 */ 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, | |
56 | /* 0x6C */ 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, | |
57 | /* 0x70 */ 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, | |
58 | /* 0x74 */ 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, | |
59 | /* 0x78 */ 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, | |
60 | /* 0x7C */ 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, | |
61 | /* 0x80 */ 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, | |
62 | /* 0x84 */ 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, | |
63 | /* 0x88 */ 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, | |
64 | /* 0x8C */ 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, | |
65 | /* 0x90 */ 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, | |
66 | /* 0x94 */ 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, | |
67 | /* 0x98 */ 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, | |
68 | /* 0x9C */ 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, | |
69 | /* 0xA0 */ 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, | |
70 | /* 0xA4 */ 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, | |
71 | /* 0xA8 */ 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, | |
72 | /* 0xAC */ 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, | |
73 | /* 0xB0 */ 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, | |
74 | /* 0xB4 */ 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, | |
75 | /* 0xB8 */ 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, | |
76 | /* 0xBC */ 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, | |
77 | /* 0xC0 */ 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, | |
78 | /* 0xC4 */ 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, | |
79 | /* 0xC8 */ 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, | |
80 | /* 0xCC */ 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, | |
81 | /* 0xD0 */ 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, | |
82 | /* 0xD4 */ 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, | |
83 | /* 0xD8 */ 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, | |
84 | /* 0xDC */ 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, | |
85 | /* 0xE0 */ 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, | |
86 | /* 0xE4 */ 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, | |
87 | /* 0xE8 */ 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, | |
88 | /* 0xEC */ 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, | |
89 | /* 0xF0 */ 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, | |
90 | /* 0xF4 */ 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, | |
91 | /* 0xF8 */ 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, | |
92 | /* 0xFC */ 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D, | |
93 | }; | |
94 | unsigned int crc32(unsigned char *address, unsigned int size, unsigned int crc) | |
95 | { | |
96 | #if 0 | |
97 | /* FAST, but bigger and only good for word-aligned data */ | |
98 | unsigned int *daddr = (unsigned int *)address; | |
99 | unsigned int data = FALSE; /* little-endian by default */ | |
100 | ||
101 | /* | |
102 | * TODO: We should really get the current processor big- or | |
103 | * little-endian state and set "data" accordingly. | |
104 | */ | |
105 | ||
106 | /* Perform word loop to save on memory accesses */ | |
107 | if (data) | |
108 | /* big-endian */ | |
109 | for (; (size > 0); size -= sizeof(unsigned int)) | |
110 | { | |
111 | data = *daddr++; | |
112 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
113 | crc32table[(crc ^ ((data >> 24) & 0xFF)) & 0xFF]); | |
114 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
115 | crc32table[(crc ^ ((data >> 16) & 0xFF)) & 0xFF]); | |
116 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
117 | crc32table[(crc ^ ((data >> 8) & 0xFF)) & 0xFF]); | |
118 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
119 | crc32table[(crc ^ ((data >> 0) & 0xFF)) & 0xFF]); | |
120 | } | |
121 | else | |
122 | for (; (size > 0); size -= sizeof(unsigned int)) | |
123 | { | |
124 | data = *daddr++; | |
125 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
126 | crc32table[(crc ^ ((data >> 0) & 0xFF)) & 0xFF]); | |
127 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
128 | crc32table[(crc ^ ((data >> 8) & 0xFF)) & 0xFF]); | |
129 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
130 | crc32table[(crc ^ ((data >> 16) & 0xFF)) & 0xFF]); | |
131 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
132 | crc32table[(crc ^ ((data >> 24) & 0xFF)) & 0xFF]); | |
133 | } | |
134 | #else | |
135 | for (; (size > 0); size--) | |
136 | /* byte loop */ | |
137 | crc = (((crc >> 8) & 0x00FFFFFF) ^ | |
138 | crc32table[(crc ^ *address++) & 0x000000FF]); | |
139 | #endif | |
140 | ||
141 | return(crc); | |
142 | } | |
143 | ||
144 | /**********************************************************************/ | |
145 | ||
146 | /* | |
147 | * crc16 16bit CRC-CCITT | |
148 | * ----- --------------- | |
149 | * This function provides a table driven 16bit CRC generation for byte data. | |
150 | * This CRC is also known as the HDLC CRC. | |
151 | */ | |
152 | /* | |
153 | * 960201 KWelton | |
154 | * | |
155 | *TODO: Is this correct? The compiler predefines __arm, *not* __ARM | |
156 | */ | |
157 | #ifdef __ARM | |
158 | /* | |
159 | * To make the code quicker on the ARM, we double the table size and | |
160 | * use integer slots rather than short slots for the table. | |
161 | */ | |
162 | static const unsigned int crctableA[16] = { | |
163 | #else | |
164 | static const unsigned short crctableA[16] = { | |
165 | #endif | |
166 | 0x0000, | |
167 | 0x1081, | |
168 | 0x2102, | |
169 | 0x3183, | |
170 | 0x4204, | |
171 | 0x5285, | |
172 | 0x6306, | |
173 | 0x7387, | |
174 | 0x8408, | |
175 | 0x9489, | |
176 | 0xA50A, | |
177 | 0xB58B, | |
178 | 0xC60C, | |
179 | 0xD68D, | |
180 | 0xE70E, | |
181 | 0xF78F | |
182 | }; | |
183 | ||
184 | #ifdef __ARM | |
185 | /* See comments above */ | |
186 | static const unsigned int crctableB[16] = { | |
187 | #else | |
188 | static const unsigned short crctableB[16] = { | |
189 | #endif | |
190 | 0x0000, | |
191 | 0x1189, | |
192 | 0x2312, | |
193 | 0x329B, | |
194 | 0x4624, | |
195 | 0x57AD, | |
196 | 0x6536, | |
197 | 0x74BF, | |
198 | 0x8C48, | |
199 | 0x9DC1, | |
200 | 0xAF5A, | |
201 | 0xBED3, | |
202 | 0xCA6C, | |
203 | 0xDBE5, | |
204 | 0xE97E, | |
205 | 0xF8F7 | |
206 | }; | |
207 | ||
208 | unsigned short crc16(unsigned char *address, unsigned int size, | |
209 | unsigned short crc) | |
210 | { | |
211 | for (; (size > 0); size--) | |
212 | { | |
213 | /* byte loop */ | |
214 | unsigned char data = *address++; /* fetch the next data byte */ | |
215 | ||
216 | data ^= crc; /* EOR data with current CRC value */ | |
217 | crc = ((crctableA[(data & 0xF0) >> 4] ^ crctableB[data & 0x0F]) ^ | |
218 | (crc >> 8)); | |
219 | } | |
220 | ||
221 | return(crc); | |
222 | } | |
223 | ||
224 | /**********************************************************************/ | |
225 | ||
226 | #if 0 /* not required at the moment */ | |
227 | ||
228 | /* | |
229 | * elf_hash | |
230 | * -------- | |
231 | * This function is derived from the one on page 68 of chapter of the "Unix | |
232 | * SVR4 Programmer's Guide". It is used to generate a hash-code from a | |
233 | * symbol name. | |
234 | */ | |
235 | unsigned int elf_hash(const unsigned char *name) | |
236 | { | |
237 | unsigned int h = 0; | |
238 | unsigned int g; | |
239 | ||
240 | /* NULL pointer returns a hash of zero */ | |
241 | while (name && (*name)) | |
242 | { | |
243 | h = ((h << 4) + *name++); | |
244 | ||
245 | if (g = (h & 0xF0000000)) | |
246 | h ^= (g >> 24); | |
247 | ||
248 | h &= ~g; | |
249 | } | |
250 | ||
251 | return(h); | |
252 | } | |
253 | #endif | |
254 | ||
255 | /**********************************************************************/ | |
256 | ||
257 | /* EOF crc.c */ |