view src/core/ngx_crc.h @ 605:5dac8c7fb71b release-0.3.24

nginx-0.3.24-RELEASE import *) Workaround: for bug in FreeBSD kqueue. *) Bugfix: now a response generated by the "post_action" directive is not transferred to a client. *) Bugfix: the memory leaks were occurring if many log files were used. *) Bugfix: the first "proxy_redirect" directive was working inside one location. *) Bugfix: on 64-bit platforms segmentation fault may occurred on start if the many names were used in the "server_name" directives; the bug had appeared in 0.3.18.
author Igor Sysoev <igor@sysoev.ru>
date Wed, 01 Feb 2006 18:22:15 +0000
parents bbd6b0b4a2b1
children 5622cdd48e5b
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 */


#ifndef _NGX_CRC_H_INCLUDED_
#define _NGX_CRC_H_INCLUDED_


/* 32-bit crc16 */

static ngx_inline uint32_t ngx_crc(char *data, size_t len)
{
    uint32_t  sum;

    for (sum = 0; len; len--) {

        /*
         * gcc 2.95.2 x86 and icc 7.1.006 compile that operator
         *                                into the single "rol" opcode.
         * msvc 6.0sp2 compiles it into four opcodes.
         */
        sum = sum >> 1 | sum << 31;

        sum += *data++;
    }

    return sum;
}


#endif /* _NGX_CRC_H_INCLUDED_ */