/*
    * 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.commons.compress.archivers.sevenz;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import org.apache.commons.lang3.ArrayUtils;
  import org.tukaani.xz.DeltaOptions;
  import org.tukaani.xz.FinishableWrapperOutputStream;
  import org.tukaani.xz.UnsupportedOptionsException;
  
  final class DeltaDecoder extends AbstractCoder {
      DeltaDecoder() {
          super(Number.class);
      }
  
      @Override
      InputStream decode(final String archiveName, final InputStream in, final long uncompressedLength, final Coder coder, final byte[] password,
              final int maxMemoryLimitKiB) throws IOException {
          return new DeltaOptions(getOptionsFromCoder(coder)).getInputStream(in);
      }
  
      @SuppressWarnings("resource")
      @Override
      OutputStream encode(final OutputStream out, final Object options) throws IOException {
          final int distance = toInt(options, 1);
          try {
              return new DeltaOptions(distance).getOutputStream(new FinishableWrapperOutputStream(out));
          } catch (final UnsupportedOptionsException ex) { // NOSONAR
              throw new IOException(ex.getMessage());
          }
      }
  
      @Override
      byte[] getOptionsAsProperties(final Object options) {
          return new byte[] { (byte) (toInt(options, 1) - 1) };
      }
  
      private int getOptionsFromCoder(final Coder coder) {
          if (coder == null || ArrayUtils.isEmpty(coder.properties)) {
              return 1;
          }
          return (0xff & coder.properties[0]) + 1;
      }
  
      @Override
      Object getOptionsFromCoder(final Coder coder, final InputStream in) {
          return getOptionsFromCoder(coder);
      }
  }