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/*
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "Ant" and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.tools.ant.taskdefs;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.zip.GZIPInputStream;
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import org.apache.tools.ant.BuildException;
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/**
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* Expands a file that has been compressed with the GZIP
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* algorithm. Normally used to compress non-compressed archives such
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* as TAR files.
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*
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* @author Stefan Bodewig
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* @author Magesh Umasankar
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*
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* @since Ant 1.1
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*
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* @ant.task category="packaging"
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*/
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public class GUnzip extends Unpack {
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private static final String DEFAULT_EXTENSION = ".gz";
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protected String getDefaultExtension() {
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return DEFAULT_EXTENSION;
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}
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protected void extract() {
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if (source.lastModified() > dest.lastModified()) {
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log("Expanding " + source.getAbsolutePath() + " to "
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+ dest.getAbsolutePath());
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FileOutputStream out = null;
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GZIPInputStream zIn = null;
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FileInputStream fis = null;
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try {
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out = new FileOutputStream(dest);
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fis = new FileInputStream(source);
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zIn = new GZIPInputStream(fis);
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byte[] buffer = new byte[8 * 1024];
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int count = 0;
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do {
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out.write(buffer, 0, count);
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count = zIn.read(buffer, 0, buffer.length);
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} while (count != -1);
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} catch (IOException ioe) {
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String msg = "Problem expanding gzip " + ioe.getMessage();
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throw new BuildException(msg, ioe, getLocation());
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} finally {
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if (fis != null) {
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try {
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fis.close();
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} catch (IOException ioex) {}
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}
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if (out != null) {
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try {
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out.close();
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} catch (IOException ioex) {}
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}
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if (zIn != null) {
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try {
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zIn.close();
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} catch (IOException ioex) {}
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}
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}
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}
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}
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}
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