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comparison src/core/ngx_crc.h @ 441:da8c5707af39

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nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
author Igor Sysoev <igor@sysoev.ru>
date Tue, 28 Sep 2004 08:34:51 +0000
parents 0b67be7d4489
children 42d11f017717
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440:f390d1775430 441:da8c5707af39
1
2 /*
3 * Copyright (C) 2002-2004 Igor Sysoev
4 */
5
6
1 #ifndef _NGX_CRC_H_INCLUDED_ 7 #ifndef _NGX_CRC_H_INCLUDED_
2 #define _NGX_CRC_H_INCLUDED_ 8 #define _NGX_CRC_H_INCLUDED_
3 9
4 10
5 /* 32-bit crc16 */ 11 /* 32-bit crc16 */
7 ngx_inline static uint32_t ngx_crc(char *data, size_t len) 13 ngx_inline static uint32_t ngx_crc(char *data, size_t len)
8 { 14 {
9 uint32_t sum; 15 uint32_t sum;
10 16
11 for (sum = 0; len; len--) { 17 for (sum = 0; len; len--) {
18
12 /* 19 /*
13 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator 20 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator
14 * into the single rol opcode. 21 * into the single "rol" opcode.
15 * msvc 6.0sp2 compiles it into four opcodes. 22 * msvc 6.0sp2 compiles it into four opcodes.
16 */ 23 */
17 sum = sum >> 1 | sum << 31; 24 sum = sum >> 1 | sum << 31;
18 25
19 sum += *data++; 26 sum += *data++;