nginx 0.8.22 *) Feature: the "proxy_bind", "fastcgi_bind", and "memcached_bind" directives. *) Feature: the "access" and the "deny" directives support IPv6. *) Feature: the "set_real_ip_from" directive supports IPv6 addresses in request headers. *) Feature: the "unix:" parameter of the "set_real_ip_from" directive. *) Bugfix: nginx did not delete unix domain socket after configuration testing. *) Bugfix: nginx deleted unix domain socket while online upgrade. *) Bugfix: the "!-x" operator did not work. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process, if limit_rate was used in HTTPS server. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process while $limit_rate logging. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process, if there was no "listen" directive in "server" block; the bug had appeared in 0.8.21.

/*
 * 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_ */