Mercurial > hg > CbC > CbC_gcc

annotate libiberty/crc32.c @ 55:77e2b8dfacca gcc-4.4.5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents
children f6334be47118
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 /* crc32.c
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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2 Copyright (C) 2009 Free Software Foundation, Inc.
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3
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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4 This file is part of the libiberty library.
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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5
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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6 This file is free software; you can redistribute it and/or modify
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
7 it under the terms of the GNU General Public License as published by
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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8 the Free Software Foundation; either version 2 of the License, or
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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9 (at your option) any later version.
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10
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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11 In addition to the permissions in the GNU General Public License, the
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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12 Free Software Foundation gives you unlimited permission to link the
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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13 compiled version of this file into combinations with other programs,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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14 and to distribute those combinations without any restriction coming
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
15 from the use of this file. (The General Public License restrictions
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
16 do apply in other respects; for example, they cover modification of
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
17 the file, and distribution when not linked into a combined
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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18 executable.)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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19
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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20 This program is distributed in the hope that it will be useful,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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21 but WITHOUT ANY WARRANTY; without even the implied warranty of
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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23 GNU General Public License for more details.
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24
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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25 You should have received a copy of the GNU General Public License
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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26 along with this program; if not, write to the Free Software
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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27 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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28 */
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29
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30 #ifdef HAVE_CONFIG_H
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31 #include "config.h"
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32 #endif
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33
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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34 #include "libiberty.h"
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35
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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36 /* This table was generated by the following program. This matches
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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37 what gdb does.
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38
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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39 #include <stdio.h>
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40
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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41 int
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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42 main ()
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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43 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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44 int i, j;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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45 unsigned int c;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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46 int table[256];
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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47
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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48 for (i = 0; i < 256; i++)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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49 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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50 for (c = i << 24, j = 8; j > 0; --j)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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51 c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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52 table[i] = c;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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53 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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54
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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55 printf ("static const unsigned int crc32_table[] =\n{\n");
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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56 for (i = 0; i < 256; i += 4)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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57 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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58 printf (" 0x%08x, 0x%08x, 0x%08x, 0x%08x",
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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59 table[i + 0], table[i + 1], table[i + 2], table[i + 3]);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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60 if (i + 4 < 256)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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61 putchar (',');
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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62 putchar ('\n');
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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63 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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64 printf ("};\n");
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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65 return 0;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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66 }
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67
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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68 For more information on CRC, see, e.g.,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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69 http://www.ross.net/crc/download/crc_v3.txt. */
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70
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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71 static const unsigned int crc32_table[] =
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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72 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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73 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
74 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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75 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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76 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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77 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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78 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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79 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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80 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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81 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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82 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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83 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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84 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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85 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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86 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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87 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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88 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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89 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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90 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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91 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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92 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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93 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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94 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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95 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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96 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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97 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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98 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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99 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
100 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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101 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
102 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
103 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
104 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
105 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
106 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
107 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
108 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
109 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
110 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
111 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
112 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
113 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
114 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
115 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
116 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
117 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
118 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
119 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
120 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
121 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
122 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
123 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
124 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
125 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
126 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
127 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
128 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 };
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 /*
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 @deftypefn Extension unsigned int crc32 (const unsigned char *@var{buf}, int @var{len}, unsigned int @var{init})
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 Compute the 32-bit CRC of @var{buf} which has length @var{len}. The
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 starting value is @var{init}; this may be used to compute the CRC of
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 data split across multiple buffers by passing the return value of each
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 call as the @var{init} parameter of the next.
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 This is intended to match the CRC used by the @command{gdb} remote
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 protocol for the @samp{qCRC} command. In order to get the same
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 results as gdb for a block of data, you must pass the first CRC
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 parameter as @code{0xffffffff}.
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 This CRC can be specified as:
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 Width : 32
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 Poly : 0x04c11db7
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 Init : parameter, typically 0xffffffff
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 RefIn : false
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 RefOut : false
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 XorOut : 0
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 This differs from the "standard" CRC-32 algorithm in that the values
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 are not reflected, and there is no final XOR value. These differences
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 make it easy to compose the values of multiple blocks.
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 @end deftypefn
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 */
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 unsigned int
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 xcrc32 (const unsigned char *buf, int len, unsigned int init)
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 {
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 unsigned int crc = init;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 while (len--)
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 {
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 buf++;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 }
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 return crc;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 }