nginx 0.1.23 *) Feature: the ngx_http_ssi_filter_module and the ssi, ssi_silent_errors, and ssi_min_file_chunk directives. The 'echo var="HTTP_..." default=""' and 'echo var="REMOTE_ADDR"' commands are supported. *) Feature: the %request_time log parameter. *) Feature: if the request has no the "Host" header line, then the "proxy_preserve_host" directive set this header line to the first server name of the "server_name" directive. *) Bugfix: nginx could not be built on platforms different from i386, amd64, sparc и ppc; bug appeared in 0.1.22. *) Bugfix: the ngx_http_autoindex_module now shows the information not about the symlink, but about file or directory it points to. *) Bugfix: the %apache_length parameter logged the negative length of the response header if the no response was transferred to a client.

/*
 * 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_ */