static void bmix(State state) {
state.k1 *= state.c1;
state.k1 = (state.k1 << 23) | (state.k1 >>> 64 - 23);
state.k1 *= state.c2;
state.h1 ^= state.k1;
state.h1 += state.h2;
state.h2 = (state.h2 << 41) | (state.h2 >>> 64 - 41);
state.k2 *= state.c2;
state.k2 = (state.k2 << 23) | (state.k2 >>> 64 - 23);
state.k2 *= state.c1;
state.h2 ^= state.k2;
state.h2 += state.h1;
state.h1 = state.h1 * 3 + 0x52dce729;
state.h2 = state.h2 * 3 + 0x38495ab5;
state.c1 = state.c1 * 5 + 0x7b7d159c;
state.c2 = state.c2 * 5 + 0x6bce6396;
}
@Override
public int hash(int hashcode) {
// Obtained by inlining MurmurHash3_x64_32(byte[], 9001) and removing all the unused code
// (since we know the input is always 4 bytes and we only need 4 bytes of output)
byte b0 = (byte) hashcode;
byte b1 = (byte) (hashcode >>> 8);
byte b2 = (byte) (hashcode >>> 16);
byte b3 = (byte) (hashcode >>> 24);
State state = new State();
state.h1 = 0x9368e53c2f6af274L ^ 9001;
state.h2 = 0x586dcd208f7cd3fdL ^ 9001;
state.c1 = 0x87c37b91114253d5L;
state.c2 = 0x4cf5ad432745937fL;
state.k1 = 0;
state.k2 = 0;
state.k1 ^= (long) b3 << 24;
state.k1 ^= (long) b2 << 16;
state.k1 ^= (long) b1 << 8;
state.k1 ^= b0;
bmix(state);
state.h2 ^= 4;
state.h1 += state.h2;
state.h2 += state.h1;
state.h1 = fmix(state.h1);
state.h2 = fmix(state.h2);
state.h1 += state.h2;
state.h2 += state.h1;
return (int) (state.h1 >>> 32);
}
/**
* Hash a value using the x64 64 bit variant of MurmurHash3
*
* @param key value to hash
* @param seed random value
* @return 64 bit hashed key
*/
public static long MurmurHash3_x64_64(final long[] key, final int seed) {
// Exactly the same as MurmurHash3_x64_128, except it only returns state.h1
State state = new State();
state.h1 = 0x9368e53c2f6af274L ^ seed;
state.h2 = 0x586dcd208f7cd3fdL ^ seed;
state.c1 = 0x87c37b91114253d5L;
state.c2 = 0x4cf5ad432745937fL;
for (int i = 0; i < key.length / 2; i++) {
state.k1 = key[i * 2];
state.k2 = key[i * 2 + 1];
bmix(state);
}
long tail = key[key.length - 1];
if (key.length % 2 != 0) {
state.k1 ^= tail;
bmix(state);
}
state.h2 ^= key.length * 8;
state.h1 += state.h2;
state.h2 += state.h1;
state.h1 = fmix(state.h1);
state.h2 = fmix(state.h2);
state.h1 += state.h2;
state.h2 += state.h1;
return state.h1;
}
/**
* Hash a value using the x64 128 bit variant of MurmurHash3
*
* @param key value to hash
* @param seed random value
* @return 128 bit hashed key, in an array containing two longs
*/
public static long[] MurmurHash3_x64_128(final long[] key, final int seed) {
State state = new State();
state.h1 = 0x9368e53c2f6af274L ^ seed;
state.h2 = 0x586dcd208f7cd3fdL ^ seed;
state.c1 = 0x87c37b91114253d5L;
state.c2 = 0x4cf5ad432745937fL;
for (int i = 0; i < key.length / 2; i++) {
state.k1 = key[i * 2];
state.k2 = key[i * 2 + 1];
bmix(state);
}
long tail = key[key.length - 1];
// Key length is odd
if ((key.length & 1) == 1) {
state.k1 ^= tail;
bmix(state);
}
state.h2 ^= key.length * 8;
state.h1 += state.h2;
state.h2 += state.h1;
state.h1 = fmix(state.h1);
state.h2 = fmix(state.h2);
state.h1 += state.h2;
state.h2 += state.h1;
return new long[] {state.h1, state.h2};
}
/**
* Hash a value using the x64 128 bit variant of MurmurHash3
*
* @param key value to hash
* @param seed random value
* @return 128 bit hashed key, in an array containing two longs
*/
public static long[] MurmurHash3_x64_128(final byte[] key, final int seed) {
State state = new State();
state.h1 = 0x9368e53c2f6af274L ^ seed;
state.h2 = 0x586dcd208f7cd3fdL ^ seed;
state.c1 = 0x87c37b91114253d5L;
state.c2 = 0x4cf5ad432745937fL;
for (int i = 0; i < key.length / 16; i++) {
state.k1 = getblock(key, i * 2 * 8);
state.k2 = getblock(key, (i * 2 + 1) * 8);
bmix(state);
}
state.k1 = 0;
state.k2 = 0;
int tail = (key.length >>> 4) << 4;
switch (key.length & 15) {
case 15:
state.k2 ^= (long) key[tail + 14] << 48;
case 14:
state.k2 ^= (long) key[tail + 13] << 40;
case 13:
state.k2 ^= (long) key[tail + 12] << 32;
case 12:
state.k2 ^= (long) key[tail + 11] << 24;
case 11:
state.k2 ^= (long) key[tail + 10] << 16;
case 10:
state.k2 ^= (long) key[tail + 9] << 8;
case 9:
state.k2 ^= (long) key[tail + 8] << 0;
case 8:
state.k1 ^= (long) key[tail + 7] << 56;
case 7:
state.k1 ^= (long) key[tail + 6] << 48;
case 6:
state.k1 ^= (long) key[tail + 5] << 40;
case 5:
state.k1 ^= (long) key[tail + 4] << 32;
case 4:
state.k1 ^= (long) key[tail + 3] << 24;
case 3:
state.k1 ^= (long) key[tail + 2] << 16;
case 2:
state.k1 ^= (long) key[tail + 1] << 8;
case 1:
state.k1 ^= (long) key[tail + 0] << 0;
bmix(state);
}
state.h2 ^= key.length;
state.h1 += state.h2;
state.h2 += state.h1;
state.h1 = fmix(state.h1);
state.h2 = fmix(state.h2);
state.h1 += state.h2;
state.h2 += state.h1;
return new long[] {state.h1, state.h2};
}
