Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_crc.h @ 218:1bf60f8c5c9e NGINX_0_3_56
nginx 0.3.56
*) Feature: the "dav_access" directive.
*) Feature: the "if" directive supports the "-d", "!-d", "-e", "!-e",
"-x", and "!-x" operators.
*) Bugfix: a segmentation fault occurred if an request returned an
redirect and some sent to client header lines were logged in the
access log.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Fri, 04 Aug 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_ */ |