1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
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26 **************************************************************************/
27
28 /**
29 * @file
30 * CRC32 implementation.
31 *
32 * @author Jose Fonseca
33 */
34
35
36 #ifdef HAVE_ZLIB
37 #include <zlib.h>
38 #endif
39 #include "crc32.h"
40
41
42 static const uint32_t
43 util_crc32_table[256] = {
44 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
45 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
46 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
47 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
48 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
49 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
50 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
51 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
52 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
53 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
54 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
55 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
56 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
57 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
58 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
59 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
60 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
61 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
62 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
63 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
64 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
65 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
66 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
67 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
68 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
69 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
70 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
71 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
72 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
73 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
74 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
75 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
76 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
77 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
78 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
79 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
80 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
81 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
82 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
83 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
84 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
85 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
86 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
87 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
88 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
89 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
90 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
91 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
92 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
93 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
94 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
95 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
96 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
97 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
98 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
99 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
100 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
101 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
102 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
103 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
104 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
105 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
106 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
107 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
108 };
109
110
111 /**
112 * @sa http://www.w3.org/TR/PNG/#D-CRCAppendix
113 */
114 uint32_t
util_hash_crc32(const void * data,size_t size)115 util_hash_crc32(const void *data, size_t size)
116 {
117 const uint8_t *p = data;
118 uint32_t crc = 0xffffffff;
119
120 #ifdef HAVE_ZLIB
121 /* Prefer zlib's implementation for better performance.
122 * zlib's uInt is always "unsigned int" while size_t can be 64bit.
123 * Since 1.2.9 there's crc32_z that takes size_t, but use the more
124 * available function to avoid build system complications.
125 */
126 if ((uInt)size == size)
127 return ~crc32(0, data, size);
128 #endif
129
130 while (size--)
131 crc = util_crc32_table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
132
133 return crc;
134 }
135