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"Murmur"hash provided by Austin, tanjent@gmail.com
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#define MIX(h,k,m) { k *= m; k ^= k >> r; k *= m; h *= m; h ^= k; }
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uint32_t murmur_hash(char *key, size_t length)
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const uint32_t m= 0x5bd1e995;
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uint32_t h= length * m;
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case 3: k += key[2] << 16;
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case 2: k += key[1] << 8;