content: /*
   * 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;
    }
  
  }
  