nginx 0.7.34 *) Feature: the "off" parameter of the "if_modified_since" directive. *) Feature: now nginx sends an HELO/EHLO command after a XCLIENT command. Thanks to Maxim Dounin. *) Feature: Microsoft specific "AUTH LOGIN with User Name" mode support in mail proxy server. Thanks to Maxim Dounin. *) Bugfix: in a redirect rewrite directive original arguments were concatenated with new arguments by an "?" rather than an "&"; the bug had appeared in 0.1.18. Thanks to Maxim Dounin. *) Bugfix: nginx could not be built on AIX.

/*
 * Copyright (C) Igor Sysoev
 */


#ifndef _NGX_CRC_H_INCLUDED_
#define _NGX_CRC_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


/* 32-bit crc16 */

static ngx_inline uint32_t
ngx_crc(u_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_ */