/*
 * ServerPacket.java
 *
 * Created on November 25, 2001, 11:23 AM
 */

package netrek.packets;

import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.BufferUnderflowException;

import java.util.logging.Logger;
import java.util.logging.Level;

/**
 *
 * @author  jrichard
 */
public abstract class ServerPacket {

    /** Creates a new instance of ServerPacket */
    public ServerPacket() {
    }
    
    public abstract byte getID();
//    public abstract int getLength();
    public abstract void scan(ByteBuffer buffer);
    
    protected void skipPadBytes(Buffer buffer, int amount)
    {
        try {
            buffer.position(buffer.position()+amount);        
        } catch (IllegalArgumentException e) {
            Logger.global.log(Level.INFO, "buffer overflow moving up " + amount);
            Logger.global.log(Level.INFO, "currently at pos = " + buffer.position());
            Logger.global.log(Level.INFO, "currently at mark = " + buffer.mark());
            Logger.global.log(Level.INFO, "currently at limit = " + buffer.limit());
            
            BufferUnderflowException bue = new BufferUnderflowException();
            bue.initCause(e);
        }
    }
    
    // todo: consider moving this to a utility class
    protected String readString(ByteBuffer buffer, int numByte)
    {
        byte[] buf = new byte[16];
        buffer.get(buf);
        int nullIndex=buf.length;
        for (int i=0, end=buf.length; i<end; i++) {
            if (buf[i] == (byte)0) {
                nullIndex = i;
                break;
            }
        }
        return new String(buf, 0, nullIndex);
    }


}