view src/core/ngx_murmurhash.c @ 5742:c45c9812cf11

Core: removed meaningless check from ngx_palloc_block(). The check became meaningless after refactoring in 2a92804f4109. With the loop currently in place, "current" can't be NULL, hence the check can be dropped. Additionally, the local variable "current" was removed to simplify code, and pool->current now used directly instead. Found by Coverity (CID 714236).
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 26 Jun 2014 03:34:19 +0400
parents 203eb026ec07
children f38647c651a8
line wrap: on
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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;
}