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318 lines
6.2 KiB
C++
318 lines
6.2 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/******************************************************************************
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* $Id: hasher.h 3843 2013-05-31 13:46:24Z pleblanc $
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*
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*****************************************************************************/
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/** @file
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* class Hasher interface
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*/
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#ifndef UTILS_HASHER_H
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#define UTILS_HASHER_H
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#include <stdint.h>
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#include <string.h>
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namespace utils
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{
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/** @brief class Hasher
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* As of 10/16/12, this implements the Murmur3 hash algorithm.
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*/
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inline uint32_t rotl32(uint32_t x, int8_t r)
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{
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return (x << r) | (x >> (32 - r));
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}
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inline uint32_t fmix(uint32_t h)
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{
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h ^= h >> 16;
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h *= 0x85ebca6b;
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h ^= h >> 13;
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h *= 0xc2b2ae35;
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h ^= h >> 16;
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return h;
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}
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inline uint64_t fmix(uint64_t k)
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{
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k ^= k >> 33;
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k *= 0xff51afd7ed558ccdULL;
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k ^= k >> 33;
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k *= 0xc4ceb9fe1a85ec53ULL;
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k ^= k >> 33;
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return k;
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}
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inline uint64_t rotl64(uint64_t x, int8_t r)
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{
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return (x << r) | (x >> (64 - r));
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}
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class Hasher {
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public:
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inline uint32_t operator()(const std::string &s) const
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{
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return operator()(s.data(), s.length());
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}
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inline uint32_t operator()(const char *data, uint64_t len) const
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{
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const int nblocks = len / 4;
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uint32_t h1 = 0;
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const uint32_t c1 = 0xcc9e2d51;
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const uint32_t c2 = 0x1b873593;
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//----------
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// body
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const uint32_t * blocks = (const uint32_t *) (data + nblocks * 4);
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for (int i = -nblocks; i; i++) {
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uint32_t k1 = blocks[i];
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k1 *= c1;
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k1 = rotl32(k1, 15);
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k1 *= c2;
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h1 ^= k1;
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h1 = rotl32(h1, 13);
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h1 = h1 * 5 + 0xe6546b64;
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}
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//----------
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// tail
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const uint8_t * tail = (const uint8_t*) (data + nblocks * 4);
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uint32_t k1 = 0;
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switch (len & 3) {
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case 3: k1 ^= tail[2] << 16;
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case 2: k1 ^= tail[1] << 8;
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case 1: k1 ^= tail[0];
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k1 *= c1;
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k1 = rotl32(k1, 15);
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k1 *= c2;
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h1 ^= k1;
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};
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//----------
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// finalization
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h1 ^= len;
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h1 = fmix(h1);
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return h1;
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}
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};
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class Hasher_r {
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public:
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inline uint32_t operator()(const char *data, uint64_t len, uint32_t seed) const
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{
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const int nblocks = len / 4;
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uint32_t h1 = seed;
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const uint32_t c1 = 0xcc9e2d51;
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const uint32_t c2 = 0x1b873593;
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//----------
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// body
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const uint32_t * blocks = (const uint32_t *) (data + nblocks * 4);
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for (int i = -nblocks; i; i++) {
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uint32_t k1 = blocks[i];
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k1 *= c1;
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k1 = rotl32(k1, 15);
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k1 *= c2;
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h1 ^= k1;
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h1 = rotl32(h1, 13);
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h1 = h1 * 5 + 0xe6546b64;
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}
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//----------
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// tail
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const uint8_t * tail = (const uint8_t*) (data + nblocks * 4);
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uint32_t k1 = 0;
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switch (len & 3) {
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case 3: k1 ^= tail[2] << 16;
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case 2: k1 ^= tail[1] << 8;
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case 1: k1 ^= tail[0];
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k1 *= c1;
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k1 = rotl32(k1, 15);
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k1 *= c2;
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h1 ^= k1;
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};
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return h1;
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}
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inline uint32_t finalize(uint32_t seed, uint32_t len) const {
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seed ^= len;
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seed = fmix(seed);
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return seed;
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}
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};
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class Hasher128 {
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public:
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inline uint64_t operator()(const char *data, uint64_t len) const
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{
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const int nblocks = len / 16;
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uint64_t h1 = 0;
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uint64_t h2 = 0;
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const uint64_t c1 = 0x87c37b91114253d5ULL;
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const uint64_t c2 = 0x4cf5ad432745937fULL;
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//----------
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// body
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const uint64_t * blocks = (const uint64_t *) (data);
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for (int i = 0; i < nblocks; i++) {
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uint64_t k1 = blocks[i * 2 + 0];
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uint64_t k2 = blocks[i * 2 + 1];
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k1 *= c1;
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k1 = rotl64(k1, 31);
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k1 *= c2;
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h1 ^= k1;
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h1 = rotl64(h1, 27);
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h1 += h2;
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h1 = h1 * 5 + 0x52dce729;
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k2 *= c2;
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k2 = rotl64(k2, 33);
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k2 *= c1;
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h2 ^= k2;
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h2 = rotl64(h2, 31);
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h2 += h1;
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h2 = h2 * 5 + 0x38495ab5;
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}
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//----------
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// tail
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const uint8_t * tail = (const uint8_t*) (data + nblocks * 16);
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uint64_t k1 = 0;
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uint64_t k2 = 0;
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switch (len & 15) {
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case 15: k2 ^= uint64_t(tail[14]) << 48;
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case 14: k2 ^= uint64_t(tail[13]) << 40;
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case 13: k2 ^= uint64_t(tail[12]) << 32;
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case 12: k2 ^= uint64_t(tail[11]) << 24;
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case 11: k2 ^= uint64_t(tail[10]) << 16;
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case 10: k2 ^= uint64_t(tail[9]) << 8;
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case 9: k2 ^= uint64_t(tail[8]) << 0;
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k2 *= c2;
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k2 = rotl64(k2, 33);
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k2 *= c1;
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h2 ^= k2;
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case 8: k1 ^= uint64_t(tail[7]) << 56;
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case 7: k1 ^= uint64_t(tail[6]) << 48;
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case 6: k1 ^= uint64_t(tail[5]) << 40;
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case 5: k1 ^= uint64_t(tail[4]) << 32;
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case 4: k1 ^= uint64_t(tail[3]) << 24;
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case 3: k1 ^= uint64_t(tail[2]) << 16;
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case 2: k1 ^= uint64_t(tail[1]) << 8;
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case 1: k1 ^= uint64_t(tail[0]) << 0;
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k1 *= c1;
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k1 = rotl64(k1, 31);
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k1 *= c2;
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h1 ^= k1;
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};
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//----------
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// finalization
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h1 ^= len;
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h2 ^= len;
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h1 += h2;
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h2 += h1;
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h1 = fmix(h1);
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h2 = fmix(h2);
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h1 += h2;
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h2 += h1;
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return h1;
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}
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};
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//------------------------------------------------------------------------------
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/** @brief class TupleHasher
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*
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*/
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//------------------------------------------------------------------------------
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class TupleHasher
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{
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public:
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TupleHasher(uint32_t len) : fHashLen(len) {}
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inline uint64_t operator()(const uint8_t* hashKey) const
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{
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return fHasher(reinterpret_cast<const char*>(hashKey), fHashLen);
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}
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private:
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Hasher fHasher;
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uint32_t fHashLen;
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};
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//------------------------------------------------------------------------------
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/** @brief class TupleComparator
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*
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*/
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//------------------------------------------------------------------------------
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class TupleComparator
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{
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public:
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TupleComparator(uint32_t len) : fCmpLen(len) {}
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inline bool operator()(const uint8_t* hashKey1, const uint8_t* hashKey2) const
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{
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return (memcmp(hashKey1, hashKey2, fCmpLen) == 0);
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}
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private:
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uint32_t fCmpLen;
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};
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}
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#endif // UTILS_HASHER_H
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