content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *    Marc R. Hoffmann - initial API and implementation
   *    
   *******************************************************************************/
  package org.jacoco.core.internal;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.jar.JarInputStream;
  import java.util.jar.JarOutputStream;
  import java.util.jar.Pack200;
  
  /**
   * Internal wrapper for the weird Pack200 Java API to allow usage with streams.
   */
  public final class Pack200Streams {
  
  	/**
  	 * Unpack a stream in Pack200 format into a stream in JAR/ZIP format.
  	 * 
  	 * @param input
  	 *            stream in Pack200 format
  	 * @return stream in JAR/ZIP format
  	 * @throws IOException
  	 *             in case of errors with the streams
  	 */
  	public static InputStream unpack(final InputStream input)
  			throws IOException {
  		final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
  		final JarOutputStream jar = new JarOutputStream(buffer);
  		Pack200.newUnpacker().unpack(new NoCloseInput(input), jar);
  		jar.finish();
  		return new ByteArrayInputStream(buffer.toByteArray());
  	}
  
  	/**
  	 * Packs a buffer in JAR/ZIP format into a stream in Pack200 format.
  	 * 
  	 * @param source
  	 *            source in JAR/ZIP format
  	 * @param output
  	 *            stream in Pack200 format
  	 * @throws IOException
  	 *             in case of errors with the streams
  	 */
  	public static void pack(final byte[] source, final OutputStream output)
  			throws IOException {
  		final JarInputStream jar = new JarInputStream(new ByteArrayInputStream(
  				source));
  		Pack200.newPacker().pack(jar, output);
  	}
  
  	private static class NoCloseInput extends FilterInputStream {
  		protected NoCloseInput(final InputStream in) {
  			super(in);
  		}
  
  		@Override
  		public void close() throws IOException {
  			// do not close the underlying stream
  		}
  	}
  
  	private Pack200Streams() {
  	}
  
  }
  