3 Copyright 2005 Red Hat, Inc.
5 This file is part of RDA, the Red Hat Debug Agent (and library).
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA.
22 Alternative licenses for RDA may be arranged by contacting Red Hat,
27 static long crc32_table[] =
29 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
30 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
31 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
32 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
33 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
34 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
35 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
36 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
37 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
38 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
39 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
40 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
41 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
42 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
43 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
44 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
45 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
46 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
47 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
48 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
49 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
50 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
51 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
52 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
53 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
54 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
55 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
56 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
57 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
58 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
59 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
60 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
61 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
62 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
63 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
64 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
65 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
66 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
67 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
68 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
69 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
70 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
71 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
72 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
73 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
74 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
75 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
76 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
77 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
78 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
79 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
80 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
81 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
82 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
83 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
84 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
85 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
86 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
87 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
88 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
89 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
90 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
91 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
92 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
95 /* crc32(), below, is based on crc_normal() from
96 ftp://ftp.rocksoft.com/papers/crc_v3.txt. The C code contained
97 in that document is fully in the public domain.
99 INIT (from the above site) is passed in as ``crc''. It starts out
100 as 0xffffffff (which is a common value to use) to match GDB. We
101 pass this value as a parameter so that crc32() may be used iteratively
102 over a number of blocks. This is accomplished by passing 0xffffffff
103 as ``crc'' for the first block and then passing the output of crc32()
104 for the previous block as ``crc'' for all subsequent blocks.
106 XOROT is 0. This is atypical for crc implementations; 0xffffffff is
107 more commonly used. This value was chosen so as to match GDB. This
108 is a convenient value to use because it allows the function below to
109 be called iteratively (as described above) using the previous block's
110 crc32() output without modification.
112 The polynomial constant used to create the lookup table is
113 0x04c11db7 which, again, matches GDB. */
116 crc32 (unsigned char *blk, int blk_len, unsigned long crc)
119 crc = crc32_table[((crc >> 24) ^ *blk++) & 0xffL] ^ (crc << 8);