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.causeway.commons.internal.base;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.util.zip.GZIPInputStream;
  import java.util.zip.GZIPOutputStream;
  
  import lombok.experimental.UtilityClass;
  
  /**
   * package private utility for {@link _Bytes}
   */
  @UtilityClass
  class _Bytes_GZipCompressor {
  
      static byte[] compress(final byte[] input) throws IOException {
  
          final int BUFFER_SIZE = Math.max(256, input.length); // at least 256
  
          final ByteArrayOutputStream os = new ByteArrayOutputStream(BUFFER_SIZE);
          final GZIPOutputStream gos = new GZIPOutputStream(os);
          gos.write(input);
          gos.close();
  
          return os.toByteArray();
      }
  
      static byte[] decompress(final byte[] compressed) throws IOException {
  
          final int BUFFER_SIZE = 32;
  
          final ByteArrayInputStream is = new ByteArrayInputStream(compressed);
          final GZIPInputStream gis = new GZIPInputStream(is, BUFFER_SIZE);
          final ByteArrayOutputStream baos = new ByteArrayOutputStream();
          final byte[] data = new byte[BUFFER_SIZE];
          int bytesRead;
          while ((bytesRead = gis.read(data)) != -1) {
              baos.write(data, 0, bytesRead);
          }
          gis.close();
          return baos.toByteArray();
      }
  
  }
  