Mercurial > hg > nginx
annotate src/core/ngx_crc32.c @ 4159:718f2154b813 stable-1.0
Merging r3933, r4154:
A new fix for the case when ssl_session_cache defined, but ssl is not
enabled in any server. The previous r1033 does not help when unused zone
becomes used after reconfiguration, so it is backed out.
The initial thought was to make SSL modules independed from SSL implementation
and to keep OpenSSL code dependance as much as in separate files.
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 30 Sep 2011 13:36:33 +0000 |
| parents | 8c696afe46b3 |
| children | d620f497c50f |
| rev | line source |
|---|---|
| 790 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 | |
| 10 | |
| 11 /* | |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
12 * The code and lookup tables are based on the algorithm |
| 790 | 13 * described at http://www.w3.org/TR/PNG/ |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
14 * |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
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 |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
17 * we use the 16 element lookup table that takes only 64 bytes and align it |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
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 | |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
21 * takes half as much CPU clocks than ngx_crc32_long(). |
| 790 | 22 */ |
| 23 | |
| 24 | |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
25 static uint32_t ngx_crc32_table16[] = { |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
26 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
27 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
28 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
29 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
30 }; |
| 790 | 31 |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
32 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
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 }; | |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
99 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
100 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
101 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
102 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
103 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
104 ngx_int_t |
|
1694
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
1021
diff
changeset
|
105 ngx_crc32_table_init(void) |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
106 { |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
107 void *p; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
108 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
109 if (((uintptr_t) ngx_crc32_table_short |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
110 & ~((uintptr_t) ngx_cacheline_size - 1)) |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
111 == (uintptr_t) ngx_crc32_table_short) |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
112 { |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
113 return NGX_OK; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
114 } |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
115 |
|
930
45df22906c12
allocate aligned ngx_crc32_table_short globally
Igor Sysoev <igor@sysoev.ru>
parents:
793
diff
changeset
|
116 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
|
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
117 if (p == NULL) { |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
118 return NGX_ERROR; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
119 } |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
120 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
121 p = ngx_align_ptr(p, ngx_cacheline_size); |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
122 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
123 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
124 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
125 ngx_crc32_table_short = p; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
126 |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
127 return NGX_OK; |
|
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
128 } |