// tarTools.java
// (C) 2008 by David Wieditz; d.wieditz@gmx.de
// first published 21.05.2008 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2011-03-08 02:51:51 +0100 (Di, 08. Mär 2011) $
// $LastChangedRevision: 7567 $
// $LastChangedBy: low012 $
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.tools;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import net.yacy.kelondro.logging.Log;
import org.apache.tools.tar.TarEntry;
import org.apache.tools.tar.TarInputStream;
public class tarTools {
public static InputStream getInputStream(final String tarFileName) throws Exception{
if (tarFileName.endsWith(".gz")) {
try {
return new GZIPInputStream(new FileInputStream(new File(tarFileName)));
} catch (IOException e) {
// this might happen if the stream is not in gzip format.
// there may be a 'gz' extension, but it may stil be a raw tar file
// this can be caused by 'one too much gzip-content header' that was attached
// by a release file server
// so just try to open is as normal stream
return new FileInputStream(new File(tarFileName));
}
}
return new FileInputStream(new File(tarFileName));
}
public static InputStream getInputStream(final File tarFileName) throws Exception{
return getInputStream(tarFileName.toString());
}
/**
* untar for any archive, overwrites existing data
* @param in use getInputStream() for convenience
* @param untarDir destination path
* @throws Exception (IOException or FileNotFoundException)
*/
public static void unTar(final InputStream in, final String untarDir) throws Exception{
Log.logInfo("UNTAR", "starting");
if(new File(untarDir).exists()){
final TarInputStream tin = new TarInputStream(in);
TarEntry tarEntry = tin.getNextEntry();
while(tarEntry != null){
final File destPath = new File(untarDir + File.separator + tarEntry.getName());
if (!tarEntry.isDirectory()) {
new File(destPath.getParent()).mkdirs(); // create missing subdirectories
final FileOutputStream fout = new FileOutputStream(destPath);
tin.copyEntryContents(fout);
fout.close();
} else {
destPath.mkdir();
}
tarEntry = tin.getNextEntry();
}
tin.close();
} else { // untarDir doesn't exist
Log.logWarning("UNTAR", "destination " + untarDir + " doesn't exist.");
}
Log.logInfo("UNTAR", "finished");
}
public static void main(final String args[]){
// @arg0 source
// @arg1 destination
if(args.length == 2){
try {
unTar(getInputStream(args[0]), args[1]);
} catch (final Exception e) {
System.out.println(e);
}
} else {
System.out.println("usage: <source> <destination>");
}
}
}