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/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.common.hash;
import static com.google.common.primitives.UnsignedBytes.toInt;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* See http://smhasher.googlecode.com/svn/trunk/MurmurHash3.cpp
* MurmurHash3_x64_128
*
* @author aappleby@google.com (Austin Appleby)
* @author andreou@google.com (Dimitris Andreou)
*/
final class Murmur3_128HashFunction extends AbstractStreamingHashFunction implements Serializable {
// TODO(user): when the shortcuts are implemented, update BloomFilterStrategies
private final int seed;
Murmur3_128HashFunction(int seed) {
this.seed = seed;
}
@Override public int bits() {
return 128;
}
@Override public Hasher newHasher() {
return new Murmur3_128Hasher(seed);
}
private static final class Murmur3_128Hasher extends AbstractStreamingHasher {
long h1;
long h2;
long c1 = 0x87c37b91114253d5L;
long c2 = 0x4cf5ad432745937fL;
int len;
Murmur3_128Hasher(int seed) {
super(16);
h1 = seed;
h2 = seed;
}
@Override protected void process(ByteBuffer bb) {
long k1 = bb.getLong();
long k2 = bb.getLong();
len += 16;
bmix64(k1, k2);
}
private void bmix64(long k1, long k2) {
k1 *= c1;
k1 = Long.rotateLeft(k1, 31);
k1 *= c2;
h1 ^= k1;
h1 = Long.rotateLeft(h1, 27);
h1 += h2;
h1 = h1 * 5 + 0x52dce729;
k2 *= c2;
k2 = Long.rotateLeft(k2, 33);
k2 *= c1;
h2 ^= k2;
h2 = Long.rotateLeft(h2, 31);
h2 += h1;
h2 = h2 * 5 + 0x38495ab5;
}
@Override protected void processRemaining(ByteBuffer bb) {
long k1 = 0;
long k2 = 0;
len += bb.remaining();
switch (bb.remaining()) {
case 15:
k2 ^= (long) toInt(bb.get(14)) << 48; // fall through
case 14:
k2 ^= (long) toInt(bb.get(13)) << 40; // fall through
case 13:
k2 ^= (long) toInt(bb.get(12)) << 32; // fall through
case 12:
k2 ^= (long) toInt(bb.get(11)) << 24; // fall through
case 11:
k2 ^= (long) toInt(bb.get(10)) << 16; // fall through
case 10:
k2 ^= (long) toInt(bb.get(9)) << 8; // fall through
case 9:
k2 ^= (long) toInt(bb.get(8)) << 0;
k2 *= c2;
k2 = Long.rotateLeft(k2, 33);
k2 *= c1;
h2 ^= k2;
// fall through
case 8:
k1 ^= (long) toInt(bb.get(7)) << 56; // fall through
case 7:
k1 ^= (long) toInt(bb.get(6)) << 48; // fall through
case 6:
k1 ^= (long) toInt(bb.get(5)) << 40; // fall through
case 5:
k1 ^= (long) toInt(bb.get(4)) << 32; // fall through
case 4:
k1 ^= (long) toInt(bb.get(3)) << 24; // fall through
case 3:
k1 ^= (long) toInt(bb.get(2)) << 16; // fall through
case 2:
k1 ^= (long) toInt(bb.get(1)) << 8; // fall through
case 1:
k1 ^= (long) toInt(bb.get(0)) << 0;
k1 *= c1;
k1 = Long.rotateLeft(k1, 31);
k1 *= c2;
h1 ^= k1;
// fall through
default:
}
}
@Override public HashCode makeHash() {
h1 ^= len;
h2 ^= len;
h1 += h2;
h2 += h1;
h1 = fmix64(h1);
h2 = fmix64(h2);
h1 += h2;
h2 += h1;
ByteBuffer bb = ByteBuffer.wrap(new byte[16]).order(ByteOrder.LITTLE_ENDIAN);
bb.putLong(h1);
bb.putLong(h2);
return HashCodes.fromBytes(bb.array());
}
private long fmix64(long k) {
k ^= k >>> 33;
k *= 0xff51afd7ed558ccdL;
k ^= k >>> 33;
k *= 0xc4ceb9fe1a85ec53L;
k ^= k >>> 33;
return k;
}
}
private static final long serialVersionUID = 0L;
}
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