113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
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/*
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* Copyright (C) Austin Appleby
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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uint32_t
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ngx_murmur_hash2(u_char *data, size_t len)
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{
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uint32_t h, k;
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h = 0 ^ len;
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while (len >= 4) {
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k = data[0];
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k |= data[1] << 8;
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k |= data[2] << 16;
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k |= data[3] << 24;
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k *= 0x5bd1e995;
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k ^= k >> 24;
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k *= 0x5bd1e995;
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h *= 0x5bd1e995;
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h ^= k;
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data += 4;
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len -= 4;
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}
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switch (len) {
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case 3:
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h ^= data[2] << 16;
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/* fall through */
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case 2:
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h ^= data[1] << 8;
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/* fall through */
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case 1:
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h ^= data[0];
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h *= 0x5bd1e995;
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}
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h ^= h >> 13;
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h *= 0x5bd1e995;
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h ^= h >> 15;
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return h;
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}
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uint64_t
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ngx_murmur_hash2_64(u_char *data, size_t len, uint64_t seed)
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{
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uint64_t h, k;
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h = seed ^ len;
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while (len >= 8) {
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k = data[0];
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k |= data[1] << 8;
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k |= data[2] << 16;
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k |= data[3] << 24;
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k |= (uint64_t)data[4] << 32;
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k |= (uint64_t)data[5] << 40;
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k |= (uint64_t)data[6] << 48;
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k |= (uint64_t)data[7] << 56;
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k *= 0xc6a4a7935bd1e995ull;
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k ^= k >> 47;
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k *= 0xc6a4a7935bd1e995ull;
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h ^= k;
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h *= 0xc6a4a7935bd1e995ull;
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data += 8;
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len -= 8;
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}
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switch (len) {
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case 7:
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h ^= (uint64_t)data[6] << 48;
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/* fall through */
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case 6:
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h ^= (uint64_t)data[5] << 40;
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/* fall through */
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case 5:
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h ^= (uint64_t)data[4] << 32;
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/* fall through */
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case 4:
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h ^= data[3] << 24;
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/* fall through */
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case 3:
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h ^= data[2] << 16;
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/* fall through */
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case 2:
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h ^= data[1] << 8;
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/* fall through */
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case 1:
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h ^= data[0];
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h *= 0xc6a4a7935bd1e995ull;
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}
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h ^= h >> 47;
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h *= 0xc6a4a7935bd1e995ull;
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h ^= h >> 47;
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return h;
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}
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