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package net.jpountz.xxhash;

import java.nio.ByteBuffer;

/*
 * 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.
 */

/**
 * A 64-bits hash.
 * 

* Instances of this class are thread-safe. */ public abstract class XXHash64 { /** * Computes the 64-bits hash of buf[off:off+len] using seed * seed. * * @param buf the input data * @param off the start offset in buf * @param len the number of bytes to hash * @param seed the seed to use * @return the hash value */ public abstract long hash(byte[] buf, int off, int len, long seed); /** * Computes the hash of the given slice of the {@link ByteBuffer}. * {@link ByteBuffer#position() position} and {@link ByteBuffer#limit() limit} * are not modified. * * @param buf the input data * @param off the start offset in buf * @param len the number of bytes to hash * @param seed the seed to use * @return the hash value */ public abstract long hash(ByteBuffer buf, int off, int len, long seed); /** * Computes the hash of the given {@link ByteBuffer}. The * {@link ByteBuffer#position() position} is moved in order to reflect bytes * which have been read. * * @param buf the input data * @param seed the seed to use * @return the hash value */ public final long hash(ByteBuffer buf, long seed) { final long hash = hash(buf, buf.position(), buf.remaining(), seed); buf.position(buf.limit()); return hash; } @Override public String toString() { return getClass().getSimpleName(); } }





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