Mercurial > hg > nginx
diff src/core/ngx_murmurhash.c @ 3891:203eb026ec07
ngx_murmur_hash2()
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 15 Apr 2011 10:59:24 +0000 |
parents | |
children | f38647c651a8 |
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new file mode 100644 --- /dev/null +++ b/src/core/ngx_murmurhash.c @@ -0,0 +1,50 @@ + +/* + * 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; +}