
com.alipay.sofa.jraft.util.CrcUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.alipay.sofa.jraft.util;
import java.nio.ByteBuffer;
/**
* CRC utilities to compute CRC64 checksum.
*
* @author boyan([email protected])
*/
public final class CrcUtil {
private static final ThreadLocal CRC_64_THREAD_LOCAL = ThreadLocal.withInitial(CRC64::new);
/**
* Compute CRC64 checksum for byte[].
*
* @param array source array
* @return checksum value
*/
public static long crc64(final byte[] array) {
if (array == null) {
return 0;
}
return crc64(array, 0, array.length);
}
/**
* Compute CRC64 checksum for byte[].
*
* @param array source array
* @param offset starting position in the source array
* @param length the number of array elements to be computed
* @return checksum value
*/
public static long crc64(final byte[] array, final int offset, final int length) {
final CRC64 crc64 = CRC_64_THREAD_LOCAL.get();
crc64.update(array, offset, length);
final long ret = crc64.getValue();
crc64.reset();
return ret;
}
/**
* Compute CRC64 checksum for {@code ByteBuffer}.
*
* @param buf source {@code ByteBuffer}
* @return checksum value
*/
public static long crc64(final ByteBuffer buf) {
final int pos = buf.position();
final int rem = buf.remaining();
if (rem <= 0) {
return 0;
}
// Currently we have not used DirectByteBuffer yet.
if (buf.hasArray()) {
return crc64(buf.array(), pos + buf.arrayOffset(), rem);
}
final byte[] b = new byte[rem];
buf.mark();
buf.get(b);
buf.reset();
return crc64(b);
}
private CrcUtil() {
}
}
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