Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.c @ 4367:9c4acdf9b276 stable-1.0
Merge of r4315:
Allowed add_header for proxied 206 replies.
It was working for nginx's own 206 replies as they are seen as 200 in the
headers filter module (range filter goes later in the headers filter chain),
but not for proxied replies.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 14 Dec 2011 18:06:21 +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 } |