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/*
* Airport2Analyzer
*
* Copyright (C) 2002, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* 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 airporthangup;
import java.util.*;
import java.io.*;
public class OSUNMSInfoHash
extends Hashtable
{
public OSUNMSInfoHash(byte[] retrievedBytes, int numBytes)
{
ByteArrayInputStream byteStream = new ByteArrayInputStream(retrievedBytes, 0, numBytes);
byte[] messageTypeBytes = new byte[2];
byteStream.read(messageTypeBytes, 0, 2);
while (byteStream.available() > 0)
{
OSUNMSInfoElement element = new OSUNMSInfoElement();
//read the length
byte[] lengthBytes = new byte[2];
byteStream.read(lengthBytes, 0, 2);
element.length = integerValue(lengthBytes);
// read the tag: 2 bytes
byte[] tagBytes = new byte[2];
byteStream.read(tagBytes, 0, 2);
element.tag = integerValue(tagBytes);
//read the value
byte[] valueBytes = new byte[element.length - 2];
byteStream.read(valueBytes, 0, element.length - 2);
element.value = valueBytes;
//System.out.println("Added element with tag " + element.tag);
// add the new element to the hashtable, using an Integer object as the key
this.put(new Integer(element.tag), element);
}
}
public OSUNMSInfoElement get(Integer integerTag)
{
return (OSUNMSInfoElement)super.get(integerTag);
}
private int integerValue(byte[] valueBytes)
{
int value = 0;
for (int i = 0; i < valueBytes.length; i++)
{
int absValue = valueBytes[i];
if (absValue < 0)
absValue += 256;
value = value*256 + absValue;
}
return value;
}
}
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