Mercurial > hg > nginx
annotate src/core/ngx_crc32.c @ 2628:64a10d6b97bd
win32 ngx_open_file() supports utf8 names and NGX_FILE_APPEND
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 30 Mar 2009 14:51:51 +0000 |
parents | 8c696afe46b3 |
children | d620f497c50f |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 /* | |
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12 * The code and lookup tables are based on the algorithm |
790 | 13 * described at http://www.w3.org/TR/PNG/ |
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14 * |
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15 * The 256 element lookup table takes 1024 bytes, and it may be completely |
1021 | 16 * cached after processing about 30-60 bytes of data. So for short data |
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17 * we use the 16 element lookup table that takes only 64 bytes and align it |
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18 * to CPU cache line size. Of course, the small table adds code inside |
1021 | 19 * CRC32 loop, but the cache misses overhead is bigger than overhead of |
20 * the additional code. For example, ngx_crc32_short() of 16 bytes of data | |
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21 * takes half as much CPU clocks than ngx_crc32_long(). |
790 | 22 */ |
23 | |
24 | |
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25 static uint32_t ngx_crc32_table16[] = { |
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26 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
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27 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
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28 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
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29 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
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30 }; |
790 | 31 |
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32 |
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33 uint32_t ngx_crc32_table256[] = { |
790 | 34 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
35 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, | |
36 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, | |
37 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, | |
38 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
39 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, | |
40 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, | |
41 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, | |
42 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, | |
43 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
44 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, | |
45 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, | |
46 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, | |
47 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, | |
48 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
49 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, | |
50 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, | |
51 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, | |
52 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, | |
53 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
54 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, | |
55 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, | |
56 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, | |
57 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, | |
58 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
59 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, | |
60 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, | |
61 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, | |
62 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, | |
63 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
64 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, | |
65 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, | |
66 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, | |
67 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, | |
68 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
69 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, | |
70 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, | |
71 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, | |
72 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, | |
73 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
74 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, | |
75 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, | |
76 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, | |
77 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, | |
78 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
79 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, | |
80 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, | |
81 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, | |
82 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, | |
83 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
84 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, | |
85 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, | |
86 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, | |
87 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, | |
88 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
89 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, | |
90 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, | |
91 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, | |
92 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, | |
93 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
94 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, | |
95 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, | |
96 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, | |
97 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d | |
98 }; | |
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99 |
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100 |
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101 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
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102 |
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103 |
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104 ngx_int_t |
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105 ngx_crc32_table_init(void) |
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106 { |
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107 void *p; |
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108 |
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109 if (((uintptr_t) ngx_crc32_table_short |
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110 & ~((uintptr_t) ngx_cacheline_size - 1)) |
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111 == (uintptr_t) ngx_crc32_table_short) |
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112 { |
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113 return NGX_OK; |
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114 } |
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115 |
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116 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
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117 if (p == NULL) { |
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118 return NGX_ERROR; |
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119 } |
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120 |
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121 p = ngx_align_ptr(p, ngx_cacheline_size); |
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122 |
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123 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
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124 |
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125 ngx_crc32_table_short = p; |
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126 |
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127 return NGX_OK; |
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128 } |