001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one or more
003 *  contributor license agreements.  See the NOTICE file distributed with
004 *  this work for additional information regarding copyright ownership.
005 *  The ASF licenses this file to You under the Apache License, Version 2.0
006 *  (the "License"); you may not use this file except in compliance with
007 *  the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.commons.compress.harmony.unpack200;
018
019import java.io.BufferedInputStream;
020import java.io.File;
021import java.io.IOException;
022import java.io.InputStream;
023import java.nio.file.Files;
024import java.util.jar.JarOutputStream;
025
026import org.apache.commons.compress.harmony.pack200.Pack200Adapter;
027import org.apache.commons.compress.harmony.pack200.Pack200Exception;
028import org.apache.commons.compress.java.util.jar.Pack200.Unpacker;
029
030/**
031 * This class provides the binding between the standard Pack200 interface and the internal interface for (un)packing. As
032 * this uses generics for the SortedMap, this class must be compiled and run on a Java 1.5 system. However, Java 1.5 is
033 * not necessary to use the internal libraries for unpacking.
034 */
035public class Pack200UnpackerAdapter extends Pack200Adapter implements Unpacker {
036    /*
037     * (non-Javadoc)
038     *
039     * @see org.apache.commons.compress.java.util.jar.Pack200.Unpacker#unpack(java.io.InputStream,
040     * java.util.jar.JarOutputStream)
041     */
042    @Override
043    public void unpack(final InputStream in, final JarOutputStream out) throws IOException {
044        if (in == null || out == null) {
045            throw new IllegalArgumentException("Must specify both input and output streams");
046        }
047        completed(0);
048        try {
049            new Archive(in, out).unpack();
050        } catch (final Pack200Exception e) {
051            throw new IOException("Failed to unpack Jar:" + e);
052        }
053        completed(1);
054    }
055
056    /*
057     * (non-Javadoc)
058     *
059     * @see org.apache.commons.compress.java.util.jar.Pack200.Unpacker#unpack(java.io.File,
060     * java.util.jar.JarOutputStream)
061     */
062    @Override
063    public void unpack(final File file, final JarOutputStream out) throws IOException {
064        if (file == null || out == null) {
065            throw new IllegalArgumentException("Must specify both input and output streams");
066        }
067        final int size = (int) file.length();
068        final int bufferSize = size > 0 && size < DEFAULT_BUFFER_SIZE ? size : DEFAULT_BUFFER_SIZE;
069        try (final InputStream in = new BufferedInputStream(Files.newInputStream(file.toPath()), bufferSize)) {
070            unpack(in, out);
071        }
072    }
073}