nginx 0.7.48 *) Feature: the "proxy_cache_key" directive. *) Bugfix: now nginx takes into account the "X-Accel-Expires", "Expires", and "Cache-Control" header lines in a backend response. *) Bugfix: now nginx caches responses for the GET requests only. *) Bugfix: the "fastcgi_cache_key" directive was not inherited. *) Bugfix: the $arg_... variables did not work with SSI subrequests. Thanks to Maxim Dounin. *) Bugfix: nginx could not be built with uclibc library. Thanks to Timothy Redaelli. *) Bugfix: nginx could not be built on OpenBSD; the bug had appeared in 0.7.46.

/*
 * 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_ */