[rcpilot-cvs] src/rcpilot/rcgs AGWAX25.java,NONE,1.1

[<mjp...@us...>]

Update of /cvsroot/rcpilot/src/rcpilot/rcgs
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv32733

Added Files:
	AGWAX25.java 
Log Message:
Parses AGW Rax AX25 frames

--- NEW FILE: AGWAX25.java ---

package rcpilot.rcgs;

import java.nio.ByteBuffer;
import java.nio.Buffer;
import java.nio.ByteOrder;



public class AGWAX25{

    public int port;
	public String destination;
	public String source;
	public String repeater_1;
	public String repeater_2;
	public byte control;
	public byte PID;
	public byte[] info;
	
	
	public AGWAX25(){
	
	}
	
	
	public int decodeAX25(byte[] dat){
		
		// Let's make sure we have the minimum size required
		if (dat.length < 17) return(-1);
		
		ByteBuffer bdat = ByteBuffer.wrap(dat);
		StringBuffer sb;
				
		// bdat.order(ByteOrder.LITTLE_ENDIAN);
		byte b;
		int t;
		
		// Get the port
		b = bdat.get();
		port = (b&0xff);
		
		//Get the destination field
		sb = new StringBuffer();
		for (int i = 0; i<6; i++){
			b = bdat.get();
			t = (b & 0xff);
			t = t >> 1;
			sb.append((char)t);
		}
		b = bdat.get();
		int s = makeSSID(b);
		if (s != 0) {
			sb.append('-');
			sb.append(Integer.toString(s));
		}
		this.destination = sb.toString();
		
		// Get the source field
		sb = new StringBuffer();
		int more = 0;
		for (int i = 0; i<6; i++){
			b = bdat.get();
			more = (b & 0x01);
			t = (b & 0xff);
			t = t >> 1;
			sb.append((char)t);
		}
		b = bdat.get();
		s = makeSSID(b);
		if (s != 0) {
			sb.append('-');
			sb.append(Integer.toString(s));
		}
		this.source = sb.toString();
		
		
		// If we have a repeater_1
		if (more == 1){
			sb = new StringBuffer();
			for (int i = 0; i<6; i++){
				b = bdat.get();
				more = (b & 0x01);
				t = (b & 0xff);
				t = t >> 1;
				sb.append((char)t);
			}
			b = bdat.get();
			s = makeSSID(b);
			if (s != 0) {
			sb.append('-');
			sb.append(Integer.toString(s));
			}
			this.repeater_1 = sb.toString();			
		}
		
		// If we have a repeater_1
		if (more == 1){
			sb = new StringBuffer();
			for (int i = 0; i<6; i++){
				b = bdat.get();
				more = b & 0x01;
				t = (b & 0xff);
				t = t >> 1;
				sb.append((char)t);
			}
			b = bdat.get();
			s = makeSSID(b);
			if (s != 0) {
			sb.append('-');
			sb.append(Integer.toString(s));
			}
			this.repeater_2 = sb.toString();			
		}
		
		
		// Get the control byte
		control = bdat.get();
		
		// Getthe PID byte
		PID = bdat.get();
		
		// Get the info bytes
		info = new byte[bdat.remaining()];
		bdat.get(info, 0, bdat.remaining());
		
		return(0);
				
	}
	
	
	private int makeSSID(byte ssid){
	
		int i = (int)(ssid & 0x0E);
		return(i);
		
	}

	
	
	
	
	
	
}