| /* |
| * 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 |
| * |
| * https://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.trevni; |
| |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| import java.util.zip.CRC32; |
| |
| /** Implements CRC32 checksum. */ |
| final class Crc32Checksum extends Checksum { |
| private CRC32 crc32 = new CRC32(); |
| |
| @Override |
| public int size() { |
| return 4; |
| } |
| |
| @Override |
| public ByteBuffer compute(ByteBuffer data) { |
| crc32.reset(); |
| crc32.update(data.array(), data.position(), data.remaining()); |
| |
| ByteBuffer result = ByteBuffer.allocate(size()); |
| result.putInt((int) crc32.getValue()); |
| ((Buffer) result).flip(); |
| return result; |
| } |
| |
| } |