com.scurrilous.circe.checksum.Crc32cIntChecksum 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.scurrilous.circe.checksum;
import com.scurrilous.circe.crc.Sse42Crc32C;
import org.apache.pulsar.shade.io.netty.buffer.ByteBuf;
public class Crc32cIntChecksum {
private final static IntHash CRC32C_HASH;
static {
if (Sse42Crc32C.isSupported()) {
CRC32C_HASH = new JniIntHash();
} else if (Java9IntHash.HAS_JAVA9_CRC32C) {
CRC32C_HASH = new Java9IntHash();
} else {
CRC32C_HASH = new Java8IntHash();
}
}
/**
* Computes crc32c checksum: if it is able to load crc32c native library then it computes using that native library
* which is faster as it computes using hardware machine instruction else it computes using crc32c algo.
*
* @param payload
* @return
*/
public static int computeChecksum(ByteBuf payload) {
return CRC32C_HASH.calculate(payload);
}
/**
* Computes crc32c checksum: if it is able to load crc32c native library then it computes using that native library
* which is faster as it computes using hardware machine instruction else it computes using crc32c algo.
*
* @param payload
* @return
*/
public static int computeChecksum(ByteBuf payload, int offset, int len) {
return CRC32C_HASH.calculate(payload, offset, len);
}
/**
* Computes incremental checksum with input previousChecksum and input payload
*
* @param previousChecksum : previously computed checksum
* @param payload
* @return
*/
public static int resumeChecksum(int previousChecksum, ByteBuf payload) {
return CRC32C_HASH.resume(previousChecksum, payload);
}
/**
* Computes incremental checksum with input previousChecksum and input payload
*
* @param previousChecksum the previously computed checksum
* @param payload the data for which the checksum is to be computed
* @param offset the starting position in the payload
* @param len the number of bytes to include in the checksum computation
* @return the updated checksum
*/
public static int resumeChecksum(int previousChecksum, ByteBuf payload, int offset, int len) {
return CRC32C_HASH.resume(previousChecksum, payload, offset, len);
}
/**
* Computes incremental checksum with input previousChecksum and input payload
*
* @param previousChecksum the previously computed checksum
* @param payload the data for which the checksum is to be computed
* @param offset the starting position in the payload
* @param len the number of bytes to include in the checksum computation
* @return the updated checksum
*/
public static int resumeChecksum(int previousChecksum, byte[] payload, int offset, int len) {
return CRC32C_HASH.resume(previousChecksum, payload, offset, len);
}
public static boolean acceptsMemoryAddressBuffer() {
return CRC32C_HASH.acceptsMemoryAddressBuffer();
}
}