Android Open Source - anode Tar Extractor

• Back to Framework/Application  ↑

From Project

Back to project page anode.

License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2011-2012 Paddy Byers//  w  w  w.  j  a  v a 2s . c  o m
 *
 *   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.meshpoint.anode.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;

import org.kamranzafar.jtar.TarEntry;
import org.kamranzafar.jtar.TarInputStream;

public class TarExtractor implements ModuleUtils.Unpacker {

  public void unpack(File src, File dest) throws IOException {
    /* first extract the tar file */
    File tarFile = new File(src.getAbsolutePath() + ".tar");
    byte[] buf = new byte[1024];
    GZIPInputStream zis = null;
    zis = new GZIPInputStream(new FileInputStream(src));
    FileOutputStream tarfos = new FileOutputStream(tarFile);
    int count;
    while ((count = zis.read(buf, 0, 1024)) != -1)
      tarfos.write(buf, 0, count);
    tarfos.close();
    zis.close();

    /* now unpack the tar */
    TarInputStream tis = new TarInputStream(new BufferedInputStream(
      new FileInputStream(tarFile)));
    TarEntry entry;
    while ((entry = tis.getNextEntry()) != null) {
      File entryFile = new File(dest, entry.getName());
      File parentDir = new File(entryFile.getParent());

      if (!parentDir.isDirectory() && !parentDir.mkdirs()) {
        tis.close();
        throw new IOException(
          "TarExtractor.unpack(): unable to create directory");
      }

      if (entry.getName().equals("././@LongLink")) {
        // GNU tar format not supported by jtar
        // attempt to recover:
        // LongLink entry provides full file name for following entry
        // -> read file name from body and skip ahead
        String filename = "";
        while ((count = tis.read(buf)) != -1) {
          filename += new String(buf, 0, count - 1);
        }
        entry = tis.getNextEntry();
        entryFile = new File(dest, filename);
        android.util.Log.v("TarExtractor",
          String.format("Encountered long filename." +
            " Moving on to: %s:%s -> %s",
            entry.getName(), entry.isDirectory(), entryFile));
      }
      if (entry.isDirectory()) {
        if (entryFile.isDirectory()) {
          // directory already exists
          android.util.Log.v("TarExtractor",
            "directory for " + entry.getName() + " already exists");
        } else if (entryFile.mkdir()) {
          // directory created (side effect)
          android.util.Log.v("TarExtractor",
            "directory created for " + entry.getName());
        } else {
          // fail
          android.util.Log.w("TarExtractor",
            "failed to create directory for " + entry.getName());
        }
      } else if (!entryFile.isDirectory()) {
        FileOutputStream fos = new FileOutputStream(entryFile);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        while ((count = tis.read(buf)) != -1) {
          bos.write(buf, 0, count);
        }

        bos.flush();
        bos.close();
      } else {
        android.util.Log.v("TarExtractor",
          String.format("What? %s:%s:%s", entryFile,
            entryFile.isDirectory(), entry.isDirectory())
          );
      }
    }
    tis.close();

    /* delete the tar file */
    tarFile.delete();
  }
}

Java Source Code List

• Back to Framework/Application  ↑