/*
* Copyright 2001-2002,2004 The Apache Software Foundation
*
* Licensed 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.tools.ant.taskdefs;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.bzip2.CBZip2InputStream;
/**
* Expands a file that has been compressed with the BZIP2
* algorithm. Normally used to compress non-compressed archives such
* as TAR files.
*
* @author Magesh Umasankar
*
* @since Ant 1.5
*
* @ant.task category="packaging"
*/
public class BUnzip2 extends Unpack {
private static final String DEFAULT_EXTENSION = ".bz2";
protected String getDefaultExtension() {
return DEFAULT_EXTENSION;
}
protected void extract() {
if (source.lastModified() > dest.lastModified()) {
log("Expanding " + source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
FileOutputStream out = null;
CBZip2InputStream zIn = null;
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
out = new FileOutputStream(dest);
fis = new FileInputStream(source);
bis = new BufferedInputStream(fis);
int b = bis.read();
if (b != 'B') {
throw new BuildException("Invalid bz2 file.", getLocation());
}
b = bis.read();
if (b != 'Z') {
throw new BuildException("Invalid bz2 file.", getLocation());
}
zIn = new CBZip2InputStream(bis);
byte[] buffer = new byte[8 * 1024];
int count = 0;
do {
out.write(buffer, 0, count);
count = zIn.read(buffer, 0, buffer.length);
} while (count != -1);
} catch (IOException ioe) {
String msg = "Problem expanding bzip2 " + ioe.getMessage();
throw new BuildException(msg, ioe, getLocation());
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException ioex) {
// ignore
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException ioex) {
// ignore
}
}
if (out != null) {
try {
out.close();
} catch (IOException ioex) {
// ignore
}
}
if (zIn != null) {
try {
zIn.close();
} catch (IOException ioex) {
// ignore
}
}
}
}
}
}