crc32.c revision 25b3c049e70834cf33790a28643ab058b507b35c 
1/* Copyright (C) 2002 Red Hat, Inc.
2   This file is part of Red Hat elfutils.
3
4   Red Hat elfutils is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by the
6   Free Software Foundation; version 2 of the License.
7
8   Red Hat elfutils is distributed in the hope that it will be useful, but
9   WITHOUT ANY WARRANTY; without even the implied warranty of
10   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11   General Public License for more details.
12
13   You should have received a copy of the GNU General Public License along
14   with Red Hat elfutils; if not, write to the Free Software Foundation,
15   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
16
17   In addition, as a special exception, Red Hat, Inc. gives You the
18   additional right to link the code of Red Hat elfutils with code licensed
19   under any Open Source Initiative certified open source license
20   (http://www.opensource.org/licenses/index.php) which requires the
21   distribution of source code with any binary distribution and to
22   distribute linked combinations of the two.  Non-GPL Code permitted under
23   this exception must only link to the code of Red Hat elfutils through
24   those well defined interfaces identified in the file named EXCEPTION
25   found in the source code files (the "Approved Interfaces").  The files
26   of Non-GPL Code may instantiate templates or use macros or inline
27   functions from the Approved Interfaces without causing the resulting
28   work to be covered by the GNU General Public License.  Only Red Hat,
29   Inc. may make changes or additions to the list of Approved Interfaces.
30   Red Hat's grant of this exception is conditioned upon your not adding
31   any new exceptions.  If you wish to add a new Approved Interface or
32   exception, please contact Red Hat.  You must obey the GNU General Public
33   License in all respects for all of the Red Hat elfutils code and other
34   code used in conjunction with Red Hat elfutils except the Non-GPL Code
35   covered by this exception.  If you modify this file, you may extend this
36   exception to your version of the file, but you are not obligated to do
37   so.  If you do not wish to provide this exception without modification,
38   you must delete this exception statement from your version and license
39   this file solely under the GPL without exception.
40
41   Red Hat elfutils is an included package of the Open Invention Network.
42   An included package of the Open Invention Network is a package for which
43   Open Invention Network licensees cross-license their patents.  No patent
44   license is granted, either expressly or impliedly, by designation as an
45   included package.  Should you wish to participate in the Open Invention
46   Network licensing program, please visit www.openinventionnetwork.com
47   <http://www.openinventionnetwork.com>.  */
48
49#include <stdint.h>
50#include "system.h"
51
52
53/* Table computed with Mark Adler's makecrc.c utility.  */
54static const uint32_t crc32_table[256] =
55{
56  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
57  0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
58  0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
59  0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
60  0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
61  0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
62  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
63  0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
64  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
65  0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
66  0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
67  0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
68  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
69  0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
70  0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
71  0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
72  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
73  0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
74  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
75  0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
76  0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
77  0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
78  0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
79  0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
80  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
81  0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
82  0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
83  0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
84  0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
85  0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
86  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
87  0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
88  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
89  0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
90  0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
91  0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
92  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
93  0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
94  0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
95  0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
96  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
97  0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
98  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
99  0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
100  0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
101  0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
102  0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
103  0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
104  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
105  0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
106  0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
107  0x2d02ef8d
108};
109
110uint32_t
111crc32 (uint32_t crc, unsigned char *buf, size_t len)
112{
113  unsigned char *end;
114
115  crc = ~crc;
116  for (end = buf + len; buf < end; ++buf)
117    crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
118  return ~crc;
119}
120