nginx 1.0.3 *) Feature: the "auth_basic_user_file" directive supports "$apr1", "{PLAIN}", and "{SSHA}" password encryption methods. Thanks to Maxim Dounin. *) Feature: the "geoip_org" directive and $geoip_org variable. Thanks to Alexander Uskov, Arnaud Granal, and Denis F. Latypoff. *) Feature: ngx_http_geo_module and ngx_http_geoip_module support IPv4 addresses mapped to IPv6 addresses. *) Bugfix: a segmentation fault occurred in a worker process during testing IPv4 address mapped to IPv6 address, if access or deny rules were defined only for IPv6; the bug had appeared in 0.8.22. *) Bugfix: a cached reponse may be broken if proxy/fastcgi/scgi/ uwsgi_cache_bypass and proxy/fastcgi/scgi/uwsgi_no_cache directive values were different; the bug had appeared in 0.8.46.

/*
 * 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_ */