//  Telnet.java
//  A Telnet window as applet
//  usage <app class="Telnet" alg="<IP-Address>" alh="Port">
//    IP-Address = Dotted 4 byte standard address
//    Port = Standard port number, e.g. 23 for Telnet port
//  Example: <app class="Telnet" alg="129.69.221.121" alh="3333">
//  Author: Fritz Hohl (hohl@hermes.informatik.uni-stuttgart.de)
//  System: Java Alpha release
//  Date: 19.5.95

import awt.*;
import browser.NameServer;
import java.io.InputStream;
import java.util.Hashtable;
import net.www.html.*;
import net.Socket;
import browser.Applet;

public class  Telnet
  extends Applet 
  implements Runnable {

String ipadresse;
Integer port;
Socket dose;
String text[] = new String[25];
public int zeile = 0;
public int spalte = 0;
// Transcript alpha;
private Thread kicker;
private Integer bip;
private Ping watchdog;
// ----------------------------------------------------
public void crlf() {
  spalte = 0;
  zeile++;
  if (zeile > 24) {
    for (int i = 0; i < 24; i++) {
      text[i] = text[i + 1];
    }
    zeile = 24;
    text[24] = "";
  }
}
// ----------------------------------------------------
public synchronized void show1(String einString) {
// alpha.show(zeile);
  if (spalte < 80) {
    text[zeile] = text[zeile].concat(einString);
    spalte += 1;
  }
  else {
    spalte = 0;
    if (zeile == 24) {
// alpha.show("Scroll on");
      for (int i = 0; i < 24; i++) {
        text[i] = text[i + 1];
      }
// alpha.show("Scroll off");
      text[24] = einString;
    }
    else {
      zeile += 1;
      text[zeile] = einString;
    }
  }
}
// ----------------------------------------------------
public void show(String einString) {
  for (int i = 0; i < einString.length(); i++) {
    show1(einString.substring(i, i + 1));
  }
}
// ----------------------------------------------------
public void init() {
  resize(640,400);
  String at = getAttribute("alg");
  if (at == null) {
    at = "0.0.0.0";
  }
  ipadresse = at;
  at = getAttribute("alh");
  if (at == null) {
    at = "0";
  }
  port = port.valueOf(at,10);
  dose = new Socket(ipadresse,port.intValue());
// alpha = Transcript.get();
  for (int i = 0; i < 25; i++) {
    text[i] = "";
  }
  show("Verbindung hergestellt.");
  bip = new Integer(0);
  watchdog = new Ping(this);
}
// ----------------------------------------------------
public int setzero() {
  int tmp;

  synchronize (bip) {
    tmp = bip.intValue();
    bip = new Integer(0);
  }
  return(tmp);
}
// ----------------------------------------------------
public int next() {
  synchronize (bip) {
    bip = new Integer(bip.intValue() + 1);
   // alpha.show(bip.intValue());
  }
  return(dose.inputStream.read());
}
// ----------------------------------------------------
public void paint(Graphics g) {
  g.clearRect(0,0,639,399);
  g.drawRect(0,0,639,399);
  for (int i = 0; i < 25; i++) {
    g.drawString(text[i],2, i*16 + 16);
  }
}
// ----------------------------------------------------
public String intToString(int zeichen) {
  byte eins[] = new byte[1];
//alpha.show(zeichen);
  eins[0] = (byte)zeichen;
  return(new String(eins,0));
}
// ----------------------------------------------------
public void keyDown( int key ) {
  dose.outputStream.write(key);
}
// ----------------------------------------------------
public synchronized void mouseUp( int x, int y) {
  getFocus();  // um Tastaturevents verarbeiten zu koennen
  if (kicker == null || !kicker.isAlive()) {
    kicker = new Thread(this);
    kicker.start();
    watchdog.start();
  }
}
// ----------------------------------------------------
public synchronized void stop() {
  if (kicker != null) {
    try {
      kicker.stop();
    } catch (IllegalStateException e) {
      // ignore this exception
    }
    kicker = null;
  }
}
// ----------------------------------------------------
public void run() {

  int key = 0;
  while (key != -1) {
    key = next();
    if (key == 13) {
      key = next();
      crlf();
      key = next();
      show1(intToString(key));
    }
    else {
      if (key == -1) {
        show("Verbindung beendet.");
      }
      else {
        if (key == 255) {
        //  alpha.show("IAC");
          key = next();
          if (key == 253) {
          //  alpha.show("DO");
            key = next();
          //  alpha.show(key);
            // No negotiations with the enemy :-)
            dose.outputStream.write(255);
            dose.outputStream.write(252);
            dose.outputStream.write(key);
          }
          if (key == 254) {
          //  alpha.show("DON'T");
            key = next();
           // alpha.show(key);
            // No negotiations with the enemy :-)
            dose.outputStream.write(255);
            dose.outputStream.write(252);
            dose.outputStream.write(key);
          }
        }
        else {
          show1(intToString(key));
        }
      }
    }
  }
}
// ----------------------------------------------------

}