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 com.scurrilous.circe.checksum;
  
  import static com.scurrilous.circe.params.CrcParameters.CRC32C;
  import com.scurrilous.circe.IncrementalIntHash;
  import com.scurrilous.circe.crc.StandardCrcProvider;
  import io.netty.buffer.ByteBuf;
  
  public class Java8IntHash implements IntHash {
  
      private final IncrementalIntHash hash = new StandardCrcProvider().getIncrementalInt(CRC32C);
  
      @Override
      public int calculate(ByteBuf buffer) {
          return resume(0, buffer);
      }
  
      @Override
      public int resume(int current, ByteBuf buffer) {
          return resume(current, buffer, buffer.readerIndex(), buffer.readableBytes());
      }
  
      @Override
      public int calculate(ByteBuf buffer, int offset, int len) {
          return resume(0, buffer, offset, len);
      }
  
      @Override
      public int resume(int current, ByteBuf buffer, int offset, int len) {
          if (buffer.hasArray()) {
              return hash.resume(current, buffer.array(), buffer.arrayOffset() + offset,
                      len);
          } else {
              return hash.resume(current, buffer.slice(offset, len).nioBuffer());
          }
      }
  
      @Override
      public int resume(int current, byte[] buffer, int offset, int len) {
          return hash.resume(current, buffer, offset, len);
      }
  
      @Override
      public boolean acceptsMemoryAddressBuffer() {
          return false;
      }
  }
  