nginx 0.7.54 *) Feature: the ngx_http_image_filter_module. *) Feature: the "proxy_ignore_headers" and "fastcgi_ignore_headers" directives. *) Bugfix: a segmentation fault might occur in worker process, if an "open_file_cache_errors off" directive was used; the bug had appeared in 0.7.53. *) Bugfix: the "port_in_redirect off" directive did not work; the bug had appeared in 0.7.39. *) Bugfix: improve handling of "select" method errors. *) Bugfix: of "select() failed (10022: ...)" error in nginx/Windows. *) Bugfix: in error text descriptions in nginx/Windows; the bug had appeared in 0.7.53.

/*
 * 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_ */