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
   *
   *     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.trevni;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.util.zip.Deflater;
  import java.util.zip.DeflaterOutputStream;
  import java.util.zip.Inflater;
  import java.util.zip.InflaterOutputStream;
  
  /** Implements DEFLATE (RFC1951) compression and decompression. */
  class DeflateCodec extends Codec {
    private ByteArrayOutputStream outputBuffer;
    private Deflater deflater;
    private Inflater inflater;
  
    @Override
    ByteBuffer compress(ByteBuffer data) throws IOException {
      ByteArrayOutputStream baos = getOutputBuffer(data.remaining());
      try (OutputStream outputStream = new DeflaterOutputStream(baos, getDeflater())) {
        outputStream.write(data.array(), computeOffset(data), data.remaining());
      }
      return ByteBuffer.wrap(baos.toByteArray());
    }
  
    @Override
    ByteBuffer decompress(ByteBuffer data) throws IOException {
      ByteArrayOutputStream baos = getOutputBuffer(data.remaining());
      try (OutputStream outputStream = new InflaterOutputStream(baos, getInflater())) {
        outputStream.write(data.array(), computeOffset(data), data.remaining());
      }
      return ByteBuffer.wrap(baos.toByteArray());
    }
  
    private Inflater getInflater() {
      if (null == inflater)
        inflater = new Inflater(true);
      inflater.reset();
      return inflater;
    }
  
    private Deflater getDeflater() {
      if (null == deflater)
        deflater = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
      deflater.reset();
      return deflater;
    }
  
    private ByteArrayOutputStream getOutputBuffer(int suggestedLength) {
      if (null == outputBuffer)
        outputBuffer = new ByteArrayOutputStream(suggestedLength);
      outputBuffer.reset();
      return outputBuffer;
    }
  
  }
  