Drizzled Public API Documentation

crc32.h
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  * Copyright (C) 1992-2007 The FreeBSD Project. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 /*
28  * The crc32 functions and data was originally written by Spencer
29  * Garrett <srg@quick.com> and was gleaned from the PostgreSQL source
30  * tree via the files contrib/ltree/crc32.[ch] and from FreeBSD at
31  * src/usr.bin/cksum/crc32.c.
32  */
33 
34 #pragma once
35 
36 #ifdef HAVE_SYS_TYPES_H
37 # include <sys/types.h>
38 #endif
39 
40 namespace drizzled {
41 namespace algorithm {
42 
43 static const uint32_t crc32tab[256] =
44 {
45  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
46  0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
47  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
48  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
49  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
50  0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
51  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
52  0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
53  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
54  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
55  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
56  0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
57  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
58  0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
59  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
60  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
61  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
62  0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
63  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
64  0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
65  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
66  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
67  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
68  0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
69  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
70  0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
71  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
72  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
73  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
74  0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
75  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
76  0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
77  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
78  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
79  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
80  0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
81  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
82  0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
83  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
84  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
85  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
86  0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
87  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
88  0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
89  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
90  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
91  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
92  0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
93  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
94  0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
95  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
96  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
97  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
98  0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
99  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
100  0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
101  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
102  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
103  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
104  0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
105  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
106  0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
107  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
108  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
109 };
110 
111 template <class T>
112 uint32_t crc32(T key, size_t key_length)
113 {
114  uint32_t crc= UINT32_MAX;
115 
116  for (size_t x= 0; x < key_length; x++)
117  crc= (crc >> 8) ^ crc32tab[(crc ^ static_cast<uint8_t>(key[x])) & 0xff];
118 
119  return ~crc;
120 }
121 
122 } /* namespace algorithm */
123 } /* namespace drizzled */