Mercurial > hg > nginx-vendor-1-0
annotate src/core/ngx_crc.h @ 180:4cd3e70c4d60 NGINX_0_3_37
nginx 0.3.37
*) Feature: the "limit_except" directive.
*) Feature: the "if" directive supports the "!~", "!~*", "-f", and
"!-f" operators.
*) Feature: the ngx_http_perl_module supports the $r->request_body
method.
*) Bugfix: in the ngx_http_addition_filter_module.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Fri, 07 Apr 2006 00:00:00 +0400 |
parents | 74b1868dd3cd |
children | acd2ec3541cb |
rev | line source |
---|---|
0 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #ifndef _NGX_CRC_H_INCLUDED_ | |
8 #define _NGX_CRC_H_INCLUDED_ | |
9 | |
10 | |
11 /* 32-bit crc16 */ | |
12 | |
16 | 13 static ngx_inline uint32_t ngx_crc(char *data, size_t len) |
0 | 14 { |
15 uint32_t sum; | |
16 | |
17 for (sum = 0; len; len--) { | |
18 | |
19 /* | |
20 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator | |
21 * into the single "rol" opcode. | |
22 * msvc 6.0sp2 compiles it into four opcodes. | |
23 */ | |
24 sum = sum >> 1 | sum << 31; | |
25 | |
26 sum += *data++; | |
27 } | |
28 | |
29 return sum; | |
30 } | |
31 | |
32 | |
33 #endif /* _NGX_CRC_H_INCLUDED_ */ |