Mercurial > hg > nginx
annotate src/core/ngx_crc32.h @ 1184:040907ba513c
release-0.5.19 tag
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 24 Apr 2007 06:21:00 +0000 |
parents | 45df22906c12 |
children | 8c696afe46b3 |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #ifndef _NGX_CRC32_H_INCLUDED_ | |
8 #define _NGX_CRC32_H_INCLUDED_ | |
9 | |
10 | |
11 #include <ngx_config.h> | |
12 #include <ngx_core.h> | |
13 | |
14 | |
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15 extern uint32_t *ngx_crc32_table_short; |
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16 extern uint32_t ngx_crc32_table256[]; |
790 | 17 |
18 | |
19 static ngx_inline uint32_t | |
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20 ngx_crc32_short(u_char *p, size_t len) |
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21 { |
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22 u_char c; |
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23 uint32_t crc; |
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parents:
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24 |
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parents:
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25 crc = 0xffffffff; |
8d39da951bbd
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Igor Sysoev <igor@sysoev.ru>
parents:
790
diff
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26 |
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parents:
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27 while (len--) { |
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parents:
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28 c = *p++; |
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29 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4); |
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parents:
790
diff
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30 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4); |
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parents:
790
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31 } |
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parents:
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32 |
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33 return crc ^ 0xffffffff; |
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parents:
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34 } |
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35 |
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parents:
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36 |
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parents:
790
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37 static ngx_inline uint32_t |
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parents:
790
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38 ngx_crc32_long(u_char *p, size_t len) |
790 | 39 { |
40 uint32_t crc; | |
41 | |
42 crc = 0xffffffff; | |
43 | |
44 while (len--) { | |
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parents:
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45 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8); |
790 | 46 } |
47 | |
48 return crc ^ 0xffffffff; | |
49 } | |
50 | |
51 | |
930
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52 ngx_int_t ngx_crc32_init(void); |
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parents:
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53 |
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54 |
790 | 55 #endif /* _NGX_CRC32_H_INCLUDED_ */ |