Mercurial > hg > nginx-quic

annotate src/core/ngx_crc.h @ 4367:9c4acdf9b276 stable-1.0

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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>
date Wed, 14 Dec 2011 18:06:21 +0000
parents 99858705b03f
children d620f497c50f
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_CRC_H_INCLUDED_
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8 #define _NGX_CRC_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 /* 32-bit crc16 */
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17 static ngx_inline uint32_t
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18 ngx_crc(u_char *data, size_t len)
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19 {
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20 uint32_t sum;
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22 for (sum = 0; len; len--) {
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24 /*
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25 * gcc 2.95.2 x86 and icc 7.1.006 compile
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26 * that operator into the single "rol" opcode,
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27 * msvc 6.0sp2 compiles it into four opcodes.
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28 */
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29 sum = sum >> 1 | sum << 31;
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31 sum += *data++;
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32 }
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34 return sum;
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35 }
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38 #endif /* _NGX_CRC_H_INCLUDED_ */