org.apache.kafka.common.utils.Checksums Maven / Gradle / Ivy
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* 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 org.apache.kafka.common.utils;
import java.nio.ByteBuffer;
import java.util.zip.Checksum;
/**
* Utility methods for `Checksum` instances.
*
* Implementation note: we can add methods to our implementations of CRC32 and CRC32C, but we cannot do the same for
* the Java implementations (we prefer the Java 9 implementation of CRC32C if available). A utility class is the
* simplest way to add methods that are useful for all Checksum implementations.
*
* NOTE: This class is intended for INTERNAL usage only within Kafka.
*/
public final class Checksums {
private Checksums() {
}
public static void update(Checksum checksum, ByteBuffer buffer, int length) {
update(checksum, buffer, 0, length);
}
public static void update(Checksum checksum, ByteBuffer buffer, int offset, int length) {
if (buffer.hasArray()) {
checksum.update(buffer.array(), buffer.position() + buffer.arrayOffset() + offset, length);
} else {
int start = buffer.position() + offset;
for (int i = start; i < start + length; i++)
checksum.update(buffer.get(i));
}
}
public static void updateInt(Checksum checksum, int input) {
checksum.update((byte) (input >> 24));
checksum.update((byte) (input >> 16));
checksum.update((byte) (input >> 8));
checksum.update((byte) input /* >> 0 */);
}
public static void updateLong(Checksum checksum, long input) {
checksum.update((byte) (input >> 56));
checksum.update((byte) (input >> 48));
checksum.update((byte) (input >> 40));
checksum.update((byte) (input >> 32));
checksum.update((byte) (input >> 24));
checksum.update((byte) (input >> 16));
checksum.update((byte) (input >> 8));
checksum.update((byte) input /* >> 0 */);
}
}