nginx-0.3.39-RELEASE import *) Feature: the "uninitialized_variable_warn" directive; the logging level of the "uninitialized variable" message was lowered from "alert" to "warn". *) Feature: the "override_charset" directive. *) Change: now if the unknown variable is used in the "echo" and "if expr='$name'" SSI-commands, then the "unknown variable" message is not logged. *) Bugfix: the active connection counter increased on the exceeding of the connection limit specified by the "worker_connections" directive; the bug had appeared in 0.2.0. *) Bugfix: the limit rate might not work on some condition; the bug had appeared in 0.3.38.

/*
 * 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_ */