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
  *
  *     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.bookkeeper.proto.checksum;
  
  import io.netty.buffer.ByteBuf;
  import java.util.zip.CRC32;
  import org.apache.bookkeeper.proto.checksum.CRC32DigestManager.CRC32Digest;
  
  /**
   * Regular implementation of CRC32 digest that makes use of {@link CRC32} class.
   */
  class StandardCRC32Digest implements CRC32Digest {
  
      private final CRC32 crc = new CRC32();
  
      @Override
      public long getValueAndReset() {
          long value = crc.getValue();
          crc.reset();
          return value;
      }
  
      @Override
      public void update(ByteBuf buf, int offset, int len) {
          crc.update(buf.slice(offset, len).nioBuffer());
      }
  
      @Override
      public void update(byte[] buffer, int offset, int len) {
          crc.update(buffer, offset, len);
      }
  }
  