Package org.jmule.core.utils

Source Code of org.jmule.core.utils.JMuleZLib

/*
*  JMule - Java file sharing client
*  Copyright (C) 2007-2008 JMule team ( jmule@jmule.org / http://jmule.org )
*
*  Any parts of this program derived from other projects, or contributed
*  by third-party developers are copyrighted by their respective authors.
*
*  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*
*/
package org.jmule.core.utils;

import java.nio.ByteBuffer;
import java.util.List;
import java.util.Vector;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

/**
*
* @author binary256
* @version $$Revision: 1.3 $$
* Last changed by $$Author: binary255 $$ on $$Date: 2009/09/17 18:32:25 $$
*/
public class JMuleZLib{

  private static int BLOCK_SIZE = 1000;
 
  public static ByteBuffer compressData(ByteBuffer inputData) {
   
    Deflater compressor = new Deflater();
   
    compressor.setInput(inputData.array());
    compressor.finish();
    long capacity = 0;
   
    int byte_count = 0;
   
    List<ByteBuffer> vector = new Vector<ByteBuffer>();
   
    do {
      ByteBuffer tmpData = Misc.getByteBuffer(BLOCK_SIZE);
     
      byte_count = compressor.deflate(tmpData.array());
   
      if (byte_count == 0) break;
     
      tmpData.limit(byte_count);
     
      vector.add(tmpData);
     
      capacity += byte_count;
     
    } while (byte_count != 0);
   
    compressor.end();
   
    ByteBuffer outputData = Misc.getByteBuffer(capacity);
   
    for(ByteBuffer buffer : vector) {
      buffer.position(0);
      outputData.put(buffer.array(), 0, buffer.limit());
    }
   
    return outputData;
   
  }
 
  public static ByteBuffer decompressData(ByteBuffer inputData) throws DataFormatException {
   
    Inflater decompressor = new Inflater();
   
    decompressor.setInput(inputData.array());
   
    long capacity = 0;
   
    int byte_count = 0;
   
    Vector<ByteBuffer> vector = new Vector<ByteBuffer>();
   
    do {
     
      ByteBuffer tmpData = Misc.getByteBuffer(BLOCK_SIZE);
     
      byte_count = decompressor.inflate(tmpData.array());
   
      tmpData.limit(byte_count);
     
      vector.add(tmpData);
     
      capacity += byte_count;
     
    } while(byte_count !=0 );
   
    decompressor.end();
   
    ByteBuffer outputBuffer = Misc.getByteBuffer(capacity);
   
    for(ByteBuffer buffer : vector) {
     
      outputBuffer.put(buffer.array(), 0, buffer.limit());
     
    }
   
    return outputBuffer;
   
   
  }
 
}
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