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790
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #ifndef _NGX_CRC32_H_INCLUDED_
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8 #define _NGX_CRC32_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13
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14
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15 extern uint32_t ngx_crc32_table[];
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16
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17
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18 static ngx_inline uint32_t
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19 ngx_crc32(u_char *p, size_t len)
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20 {
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21 uint32_t crc;
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22
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23 crc = 0xffffffff;
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24
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25 while (len--) {
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26 crc = ngx_crc32_table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
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27 }
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28
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29 return crc ^ 0xffffffff;
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30 }
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31
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32
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33 #endif /* _NGX_CRC32_H_INCLUDED_ */
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