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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/**
* Copyright (c) 2013-2024 Nikita Koksharov
*
* 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 org.redisson.misc;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.base64.Base64;
import io.netty.util.CharsetUtil;
/**
*
* @author Nikita Koksharov
*
*/
public final class Hash {
private static final long[] KEY = {0x9e3779b97f4a7c15L, 0xf39cc0605cedc834L, 0x1082276bf3a27251L, 0xf86c6a11d0c18e95L};
private Hash() {
}
public static byte[] hash128toArray(ByteBuf objectState) {
long[] hash = hash128(objectState);
ByteBuf buf = Unpooled.copyLong(hash[0], hash[1]);
try {
byte[] dst = new byte[buf.readableBytes()];
buf.readBytes(dst);
return dst;
} finally {
buf.release();
}
}
public static long hash64(ByteBuf objectState) {
HighwayHash h = calcHash(objectState);
return h.finalize64();
}
public static long[] hash128(ByteBuf objectState) {
HighwayHash h = calcHash(objectState);
return h.finalize128();
}
protected static HighwayHash calcHash(ByteBuf objectState) {
HighwayHash h = new HighwayHash(KEY);
int i;
int length = objectState.readableBytes();
int offset = objectState.readerIndex();
byte[] data = new byte[32];
for (i = 0; i + 32 <= length; i += 32) {
objectState.getBytes(offset + i, data);
h.updatePacket(data, 0);
}
if ((length & 31) != 0) {
data = new byte[length & 31];
objectState.getBytes(offset + i, data);
h.updateRemainder(data, 0, length & 31);
}
return h;
}
public static String hash128toBase64(ByteBuf objectState) {
long[] hash = hash128(objectState);
ByteBuf buf = Unpooled.copyLong(hash[0], hash[1]);
try {
ByteBuf b = Base64.encode(buf);
try {
String s = b.toString(CharsetUtil.UTF_8);
return s.substring(0, s.length() - 2);
} finally {
b.release();
}
} finally {
buf.release();
}
}
}
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