/** * MMSLIB - A Java Implementation of the MMS Protocol * Copyright (C) 2004 Simon Vogl  * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */package at.jku.soft.mms.util;import net.sourceforge.jwap.wsp.*;import net.sourceforge.jwap.wsp.pdu.*;import net.sourceforge.jwap.util.*;import java.util.*;import org.apache.log4j.*;//protected class DataBlock {public class DataBlock {    public byte[] data;    public int pos;      // position in the data block    public DataBlock(int len)    {	data = new byte[len];	pos=0;    }    public DataBlock()    {	this(1500); // default MTU size    }    public synchronized void realloc(int size)     {	byte tmp[] = new byte[size];	int max = ( size> data.length) ? size: data.length;	System.arraycopy(data, 0, tmp, 0, max);	if (pos>max) pos=max;	data = tmp;    }    protected void growIfNeeded(int toSize)     {	if (pos >= data.length)	    realloc(toSize);    }        private void growIfNeeded()     {	growIfNeeded(data.length * 2);    }    public synchronized void add(byte b)     {	growIfNeeded();	data[pos++]=b;    }    public synchronized void add(byte[] b) {	growIfNeeded( (data.length * 2) + b.length);	    	    	    	System.arraycopy(b, 0, data, pos, b.length);    	pos = pos + b.length;    	    }        public synchronized void addShortInt(int i)     {	//if (i>=128) {err}	growIfNeeded();	data[pos++]= (byte)(i | 0x80);    }        public void addString(String s)     {	char cs[] = s.toCharArray();	for (int i=0;i<cs.length;i++) {	    add((byte)(cs[i]));	}	add((byte)(0x00));    }    public void addUIntVar(long var)    {	int i;	if (var<0){ // it should work anyway, but haven't tried	    throw new NumberFormatException("No negative values supported");	} 	if(var==0){	    add((byte)0);	    return;	}	// split into 7-bit values	byte bits[] = new byte[8];	for (i=0;i<8;i++) {	    bits[i] = (byte)(var & 0x7f);	    var >>=7;	}	i=7;	while ( bits[i] == 0 ) { i--; } // skip over empty values	// now start coding:	while (i>0) {	    add( (byte)(0x80 | bits[i]) );	    i--;	} 	add(bits[0]);    }    public synchronized byte[] getAsByteArray() {    	byte ret[] = new byte[pos];    	System.arraycopy(data, 0, ret, 0, pos);    	    	return ret;    }}