@@ -0,0 +1,1337 @@
+/**%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0Apackage org.apache.trevni;%0A%0Aimport java.nio.ByteBuffer;%0Aimport java.util.zip.CRC32;%0A%0A/** Implements CRC32 checksum. */%0Afinal class Crc32Checksum extends Checksum %7B%0A  private CRC32 crc32 = new CRC32();%0A%0A  @Override public int size() %7B return 4; %7D%0A%0A  @Override public ByteBuffer compute(ByteBuffer data) %7B%0A    crc32.reset();%0A    crc32.update(data.array(), data.position(), data.remaining());%0A%0A    ByteBuffer result = ByteBuffer.allocate(size());%0A    result.putInt((int)crc32.getValue());%0A    result.flip();%0A    return result;%0A %7D%0A%0A%7D%0A

Add crc32 checksum, checkum tests and a bugfix.