view src/core/ngx_murmurhash.c @ 684:660139fd80ca NGINX_1_3_5

nginx 1.3.5 *) Change: the ngx_http_mp4_module module no longer skips tracks in formats other than H.264 and AAC. *) Bugfix: a segmentation fault might occur in a worker process if the "map" directive was used with variables as values. *) Bugfix: a segmentation fault might occur in a worker process if the "geo" directive was used with the "ranges" parameter but without the "default" parameter; the bug had appeared in 0.8.43. Thanks to Zhen Chen and Weibin Yao. *) Bugfix: in the -p command-line parameter handling. *) Bugfix: in the mail proxy server. *) Bugfix: of minor potential bugs. Thanks to Coverity. *) Bugfix: nginx/Windows could not be built with Visual Studio 2005 Express. Thanks to HAYASHI Kentaro.
author Igor Sysoev <http://sysoev.ru>
date Tue, 21 Aug 2012 00:00:00 +0400
parents 8dc007eddbcf
children
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/*
 * Copyright (C) Austin Appleby
 */


#include <ngx_config.h>
#include <ngx_core.h>


uint32_t
ngx_murmur_hash2(u_char *data, size_t len)
{
    uint32_t  h, k;

    h = 0 ^ len;

    while (len >= 4) {
        k  = data[0];
        k |= data[1] << 8;
        k |= data[2] << 16;
        k |= data[3] << 24;

        k *= 0x5bd1e995;
        k ^= k >> 24;
        k *= 0x5bd1e995;

        h *= 0x5bd1e995;
        h ^= k;

        data += 4;
        len -= 4;
    }

    switch (len) {
    case 3:
        h ^= data[2] << 16;
    case 2:
        h ^= data[1] << 8;
    case 1:
        h ^= data[0];
        h *= 0x5bd1e995;
    }

    h ^= h >> 13;
    h *= 0x5bd1e995;
    h ^= h >> 15;

    return h;
}