Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_crc.h @ 602:c5122335e41d NGINX_0_8_53
nginx 0.8.53
*) Feature: now the "error_page" directive allows to change a status
code in a redirect.
*) Feature: the "gzip_disable" directive supports special "degradation"
mask.
*) Bugfix: a socket leak might occurred if file AIO was used.
Thanks to Maxim Dounin.
*) Bugfix: if the first server had no "listen" directive and there was
no explicit default server, then a next server with a "listen"
directive became the default server; the bug had appeared in 0.8.21.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Mon, 18 Oct 2010 00:00:00 +0400 |
| parents | fbf2b2f66c9f |
| children | d0f7a625f27c |
| 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 | |
| 250 | 11 #include <ngx_config.h> |
| 12 #include <ngx_core.h> | |
| 13 | |
| 14 | |
| 0 | 15 /* 32-bit crc16 */ |
| 16 | |
| 248 | 17 static ngx_inline uint32_t |
| 250 | 18 ngx_crc(u_char *data, size_t len) |
| 0 | 19 { |
| 20 uint32_t sum; | |
| 21 | |
| 22 for (sum = 0; len; len--) { | |
| 23 | |
| 24 /* | |
| 248 | 25 * gcc 2.95.2 x86 and icc 7.1.006 compile |
| 26 * that operator into the single "rol" opcode, | |
| 0 | 27 * msvc 6.0sp2 compiles it into four opcodes. |
| 28 */ | |
| 29 sum = sum >> 1 | sum << 31; | |
| 30 | |
| 31 sum += *data++; | |
| 32 } | |
| 33 | |
| 34 return sum; | |
| 35 } | |
| 36 | |
| 37 | |
| 38 #endif /* _NGX_CRC_H_INCLUDED_ */ |