--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/com/five_ten_sg/connectbot/service/TerminalMonitor.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,522 @@
+package com.five_ten_sg.connectbot.service;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.net.Uri;
+import android.os.IBinder;
+import android.util.Log;
+import android.view.View;
+import de.mud.terminal.vt320;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+
+import com.five_ten_sg.connectbot.ConsoleActivity;
+import com.five_ten_sg.connectbot.bean.HostBean;
+
+
+public class TerminalMonitor {
+    public final static String TAG = "ConnectBot.TerminalMonitor";
+
+    public  static final char MONITOR_CMD_INIT          = 0;
+    public  static final char MONITOR_CMD_ACTIVATE      = 1;
+    public  static final char MONITOR_CMD_KEYSTATE      = 2;
+    public  static final char MONITOR_CMD_CURSORMOVE    = 3;
+    public  static final char MONITOR_CMD_SCREENCHANGE  = 4;
+    public  static final char MONITOR_CMD_FIELDVALUE    = 5;
+    public  static final char MONITOR_CMD_SETFIELD      = 5;
+    public  static final char MONITOR_CMD_GETFIELD      = 6;
+    public  static final char MONITOR_CMD_SCREENWATCH   = 7;
+    public  static final char MONITOR_CMD_DEPRESS       = 8;
+    public  static final char MONITOR_CMD_SHOWURL       = 9;
+    public  static final char MONITOR_CMD_SWITCHSESSION = 10;
+    public  static final char MONITOR_CMD_CURSORREQUEST = 11;
+
+    public  static final String[] commands = {
+        "cmd_init",
+        "cmd_activate",
+        "cmd_keystate",
+        "cmd_cursormove",
+        "cmd_screenchange",
+        "cmd_fieldvalue/setfield",
+        "cmd_getfield",
+        "cmd_screenwatch",
+        "cmd_depress",
+        "cmd_showurl",
+        "cmd_switchsession",
+        "cmd_cursorrequest"
+    };
+
+    public  static final char CURSOR_REQUESTED      = 0;
+    public  static final char CURSOR_SCREEN_CHANGE  = 1;
+    public  static final char CURSOR_USER_KEY       = 2;
+
+    private static final int    MONITORPORT       = 6000;
+    private static final String LOCALHOST         = "127.0.0.1";
+
+    private Context             parent       = null;
+    private vt320               buffer       = null;
+    private View                view         = null;
+    private HostBean            host         = null;
+    private String              init         = null;
+    private int                 start_line   = 0;       // monitor part of the screen for changes
+    private int                 end_line     = 500;     // ""
+    private int                 start_column = 0;       // ""
+    private int                 end_column   = 500;     // ""
+    private boolean             modified     = false;   // used to delay screen change notifications
+    private boolean             moved        = false;   // used to delay cursor moved notifications
+    private int                 to_line      = 0;       // ""
+    private int                 to_column    = 0;       // ""
+    private HashMap<Integer, Integer>  keymap = null;   // map MS VK_ keys to vt320 virtual keys
+    private IBinder             bound        = null;
+    private Socket              monitor_socket = null;
+    private InputStream         monitor_in     = null;
+    private OutputStream        monitor_out    = null;
+    private MyReader            monitor_reader = null;
+    private BlockingQueue<char[]> pending_commands = new ArrayBlockingQueue<char[]>(100);
+    private MyServiceConnection monitor_connection = new MyServiceConnection();
+
+    class MyReader extends Thread {
+        private InputStream monitor_in;
+        private byte[] b;
+        private boolean is_closing = false;
+
+        public MyReader(InputStream monitor_in) {
+            this.monitor_in = monitor_in;
+            b = new byte[100];
+            Log.i(TAG, "MyReader constructor");
+        }
+
+        public void closing() {
+            is_closing = true;
+        }
+
+        private char[] forceRead(int len) throws IOException {
+            int len2 = len * 2;
+            int off  = 0;
+
+            if (b.length < len2) b = new byte[len2];
+
+            while (off < len2) {
+                int l = monitor_in.read(b, off, len2 - off);
+
+                if (l < 0) throw new IOException("eof");
+
+                off += l;
+            }
+
+            return bytesToChars(b, len2);
+        }
+
+        public void run() {
+            while (true) {
+                try {
+                    char[] len = forceRead(1);
+                    char[] packet = forceRead(len[0]);
+                    char cmd = packet[0];
+                    Log.i(TAG, String.format("received %s", commands[cmd]));
+
+                    switch (cmd) {
+                        case MONITOR_CMD_SETFIELD:
+                            if (packet.length >= 3)
+                                setField(packet[1], packet[2], packet, 3);
+
+                            break;
+
+                        case MONITOR_CMD_GETFIELD:
+                            if (packet.length == 4)
+                                getField(packet[1], packet[2], packet[3]);
+
+                            break;
+
+                        case MONITOR_CMD_SCREENWATCH:
+                            if (packet.length == 4)
+                                screenWatch(packet[1], packet[2], packet[3]);
+
+                            break;
+
+                        case MONITOR_CMD_DEPRESS:
+                            if (packet.length == 2)
+                                depress(packet[1]);
+
+                            break;
+
+                        case MONITOR_CMD_SHOWURL:
+                            if (packet.length > 1)
+                                showUrl(packet, 1);
+
+                            break;
+
+                        case MONITOR_CMD_SWITCHSESSION:
+                            if (packet.length == 1)
+                                switchSession();
+
+                            break;
+
+                        case MONITOR_CMD_CURSORREQUEST:
+                            if (packet.length == 1)
+                                cursorRequest();
+
+                            break;
+
+                        default:
+                            break;
+                    }
+                }
+                catch (IOException e) {
+                    if (!is_closing) Log.e(TAG, "exception in MyReader.run()", e);
+
+                    break;
+                }
+            }
+        }
+    }
+
+    class MyServiceConnection implements ServiceConnection {
+        public void onServiceConnected(ComponentName className, IBinder service) {
+            bound = service;
+            Log.i(TAG, "bound to service");
+
+            try {
+                InetAddress serverAddr = InetAddress.getByName(LOCALHOST);
+                int tries = 0;
+                while (tries < 10) {
+                    try {
+                        Thread.sleep(100);
+                        monitor_socket = new Socket(serverAddr, MONITORPORT);
+                        break;
+                    }
+                    catch (Exception e) {
+                        monitor_socket = null;
+                        Log.e(TAG, "exception connecting to monitor socket", e);
+                        tries = tries + 1;
+                    }
+                }
+                if (monitor_socket != null) {
+                    Log.i(TAG, "connected to monitor socket, send init " + init);
+                    monitor_in     = monitor_socket.getInputStream();
+                    monitor_out    = monitor_socket.getOutputStream();
+                    monitor_reader = new MyReader(monitor_in);
+                    monitor_reader.start();
+                    String x = "  " + init;
+                    monitorWrite(MONITOR_CMD_INIT, x.toCharArray());
+                    char [] c;
+
+                    while (true) {
+                        c = pending_commands.poll();
+
+                        if (c == null) break;
+
+                        monitorWrite(c[1], c);
+                   }
+                }
+            }
+            catch (IOException e) {
+                Log.e(TAG, "exception in onServiceConnected()", e);
+            }
+        }
+        public void onServiceDisconnected(ComponentName classNam) {
+            bound = null;
+            Log.i(TAG, "unbound from service");
+        }
+    };
+
+
+    public TerminalMonitor(Context parent, vt320 buffer, View view, HostBean host, String init) {
+        this.parent      = parent;
+        this.buffer      = buffer;
+        this.view        = view;
+        this.host        = host;
+        this.init        = init;
+        // setup the windows->android keymapping
+        // http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731
+        keymap      = new HashMap<Integer, Integer>();
+        keymap.put(0x08, vt320.KEY_BACK_SPACE);  // vk_back
+        keymap.put(0x09, vt320.KEY_TAB);         // vk_tab
+        keymap.put(0x0d, vt320.KEY_ENTER);       // vk_return
+        keymap.put(0x1b, vt320.KEY_ESCAPE);      // vk_escape
+        keymap.put(0x21, vt320.KEY_PAGE_UP);     // vk_prior
+        keymap.put(0x22, vt320.KEY_PAGE_DOWN);   // vk_next
+        keymap.put(0x23, vt320.KEY_END);         // vk_end
+        keymap.put(0x24, vt320.KEY_HOME);        // vk_home
+        keymap.put(0x25, vt320.KEY_LEFT);        // vk_left
+        keymap.put(0x26, vt320.KEY_UP);          // vk_up
+        keymap.put(0x27, vt320.KEY_RIGHT);       // vk_right
+        keymap.put(0x28, vt320.KEY_DOWN);        // vk_down
+        keymap.put(0x2d, vt320.KEY_INSERT);      // vk_insert
+        keymap.put(0x2e, vt320.KEY_DELETE);      // vk_delete
+        keymap.put(0x70, vt320.KEY_F1);          // vk_f1
+        keymap.put(0x71, vt320.KEY_F2);          // vk_f2
+        keymap.put(0x72, vt320.KEY_F3);          // vk_f3
+        keymap.put(0x73, vt320.KEY_F4);          // vk_f4
+        keymap.put(0x74, vt320.KEY_F5);          // vk_f5
+        keymap.put(0x75, vt320.KEY_F6);          // vk_f6
+        keymap.put(0x76, vt320.KEY_F7);          // vk_f7
+        keymap.put(0x77, vt320.KEY_F8);          // vk_f8
+        keymap.put(0x78, vt320.KEY_F9);          // vk_f9
+        keymap.put(0x79, vt320.KEY_F10);         // vk_f10
+        keymap.put(0x7a, vt320.KEY_F11);         // vk_f11
+        keymap.put(0x7b, vt320.KEY_F12);         // vk_f12
+        keymap.put(0x7c, vt320.KEY_F13);         // vk_f13
+        keymap.put(0x7d, vt320.KEY_F14);         // vk_f14
+        keymap.put(0x7e, vt320.KEY_F15);         // vk_f15
+        keymap.put(0x7f, vt320.KEY_F16);         // vk_f16
+        keymap.put(0x80, vt320.KEY_F17);         // vk_f17
+        keymap.put(0x81, vt320.KEY_F18);         // vk_f18
+        keymap.put(0x82, vt320.KEY_F19);         // vk_f19
+        keymap.put(0x83, vt320.KEY_F20);         // vk_f20
+        keymap.put(0x84, vt320.KEY_F21);         // vk_f21
+        keymap.put(0x85, vt320.KEY_F22);         // vk_f22
+        keymap.put(0x86, vt320.KEY_F23);         // vk_f23
+        keymap.put(0x87, vt320.KEY_F24);         // vk_f24
+        // bind to the monitor service
+        Intent intent = new Intent("com.five_ten_sg.connectbot.monitor.MonitorService");
+        parent.bindService(intent, monitor_connection, Context.BIND_AUTO_CREATE);
+        Log.i(TAG, "constructor");
+    }
+
+
+    public void Disconnect() {
+        if (monitor_reader != null) monitor_reader.closing();
+
+        try {
+            if (monitor_out    != null) monitor_out.close();
+
+            if (monitor_in     != null) monitor_in.close();
+
+            if (monitor_socket != null) monitor_socket.close();
+
+            Log.i(TAG, "disconnected from monitor socket");
+        }
+        catch (IOException e) {
+            Log.e(TAG, "exception in Disconnect() closing sockets", e);
+        }
+
+        monitor_reader = null;
+        monitor_out    = null;
+        monitor_in     = null;
+        monitor_socket = null;
+
+        if (bound != null) parent.unbindService(monitor_connection);
+
+        monitor_connection = null;
+    }
+
+
+    public char[] bytesToChars(byte[] b, int len) {
+        char[] c = new char[len >> 1];
+        int bp = 0;
+
+        for (int i = 0; i < c.length; i++) {
+            byte b1 = b[bp++];
+            byte b2 = b[bp++];
+            c[i] = (char)(((b1 & 0x00FF) << 8) + (b2 & 0x00FF));
+        }
+
+        return c;
+    }
+
+
+    public byte[] charsToBytes(char[] c) {
+        byte[] b = new byte[c.length << 1];
+        int bp = 0;
+
+        for (int i = 0; i < c.length; i++) {
+            b[bp++] = (byte)((c[i] & 0xff00) >> 8);
+            b[bp++] = (byte)(c[i] & 0x00ff);
+        }
+
+        return b;
+    }
+
+
+    public synchronized void monitorWrite(char cmd, char[] c) {
+        try {
+            if (monitor_out != null) {
+                c[0] = (char)(c.length - 1);    // number of chars following
+                c[1] = cmd;
+                Log.i(TAG, String.format("sending %s", commands[cmd]));
+                monitor_out.write(charsToBytes(c));
+                monitor_out.flush();
+            }
+            else {
+                c[1] = cmd;
+                pending_commands.offer(c);
+            }
+        }
+        catch (IOException e) {
+            Log.i(TAG, "exception in monitorWrite(), monitor died or closed the socket", e);
+
+            try {
+                monitor_out.close();
+            }
+            catch (IOException ee) {
+                Log.e(TAG, "exception in monitorWrite() closing output stream", ee);
+            }
+
+            monitor_out = null;
+        }
+    };
+
+    public void resetWatch() {
+        start_line   = 0;
+        end_line     = 500;
+        start_column = 0;
+        end_column   = 500;
+    };
+
+    public void sendScreen(char cmd) {
+        char lines   = (char)(buffer.height & 0x0000ffff);
+        char columns = (char)(buffer.width & 0x0000ffff);
+        char[] arg = new char[4 + lines * columns];
+        arg[2] = lines;
+        arg[3] = columns;
+        int base = 4;
+
+        for (int i = 0; i < lines; i++) {
+            System.arraycopy(buffer.charArray[buffer.screenBase + i], 0, arg, base, columns);
+            base += columns;
+        }
+
+        monitorWrite(cmd, arg);
+        resetWatch();
+    }
+
+    public synchronized void activate() {
+        sendScreen(MONITOR_CMD_ACTIVATE);
+        cursorMoved(CURSOR_SCREEN_CHANGE);
+    }
+
+    public synchronized void keyState(boolean down) {
+        char[] arg = new char[3];
+        arg[2] = (char)((down) ? 1 : 0);
+        monitorWrite(MONITOR_CMD_KEYSTATE, arg);
+    }
+
+    public synchronized void cursorMove(int l, int c) {
+        if ((to_line != l) || (to_column != c)) moved = true;
+
+        to_line = l;
+        to_column = c;
+    }
+
+    public void cursorMoved(char why) {
+        char[] arg = new char[5];
+        arg[2] = (char)(to_line & 0x0000ffff);
+        arg[3] = (char)(to_column & 0x0000ffff);
+        arg[4] = why;
+        monitorWrite(MONITOR_CMD_CURSORMOVE, arg);
+        moved = false;
+    }
+
+    public void testMoved() {
+        if (moved) cursorMoved(CURSOR_USER_KEY);
+    }
+
+    public synchronized void testChanged() {
+        if (modified) {
+            modified = false;
+            sendScreen(MONITOR_CMD_SCREENCHANGE);
+            cursorMoved(CURSOR_SCREEN_CHANGE);
+        }
+        else {
+            if (moved) cursorMoved(CURSOR_SCREEN_CHANGE);
+        }
+    }
+
+    public synchronized void screenChanged(int llow, int lhigh, int clow, int chigh) {
+        if ((start_line <= lhigh) && (llow <= end_line) && (start_column <= chigh) && (clow <= end_column)) {
+            modified = true;
+        }
+    }
+
+    public synchronized void screenChanged(int l, int c) {
+        screenChanged(l, l, c, c);
+    }
+
+    public synchronized void setField(int l, int c, char[] data, int offset) {
+        int len = data.length - offset;
+        char[] da = new char[len];
+        System.arraycopy(data, offset, da, 0, len);
+        Log.i(TAG, String.format("setField(line %d, col %d, value %s)", l, c, new String(da)));
+
+        if ((l > 60000) || (c > 60000)) {
+            l = -1;
+            c = -1;
+        }
+        else {
+            // ignore setfield outside screen boundaries
+            if ((l >= buffer.height) || (c + len > buffer.width)) return;
+        }
+
+        buffer.setField(l, c, da);
+    }
+
+    public synchronized void showUrl(char [] data, int offset) {
+        char[] da = new char[data.length - offset];
+        System.arraycopy(data, offset, da, 0, data.length - offset);
+        String url = new String(da);
+        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        parent.startActivity(intent);
+    }
+
+    public synchronized void getField(int l, int c, int len) {
+        Log.i(TAG, String.format("getField(line %d, col %d, len %d)", l, c, len));
+        char[] arg2 = new char[4 + len];
+        arg2[2] = (char)(l & 0x0000ffff);
+        arg2[3] = (char)(c & 0x0000ffff);
+        int base = 4;
+
+        if ((l >= buffer.height) || (c + len > buffer.width)) {
+            Arrays.fill(arg2, base, base + len, ' ');
+        }
+        else {
+            System.arraycopy(buffer.charArray[buffer.screenBase + l], c, arg2, base, len);
+        }
+
+        char[] da = new char[len];
+        System.arraycopy(arg2, base, da, 0, len);
+        Log.i(TAG, String.format("getField value %s", new String(da)));
+
+        monitorWrite(MONITOR_CMD_FIELDVALUE, arg2);
+    }
+
+    public synchronized void screenWatch(int l, int c, int len) {
+        Log.i(TAG, String.format("screenWatch(line %d, col %d, len %d)", l, c, len));
+        start_line   = l;
+        end_line     = l;
+        start_column = c;
+        end_column   = c + len - 1;
+    }
+
+    public synchronized void depress(int vk_key) {
+        Log.i(TAG, String.format("depress(%d)", vk_key));
+        Integer x = keymap.get(new Integer(vk_key));
+
+        if (x != null) buffer.keyDepressed(x, ' ', 0);
+    }
+
+    public synchronized void switchSession() {
+        Log.i(TAG, "switchSession()");
+        Intent intent = new Intent(parent, ConsoleActivity.class);
+        intent.setAction(Intent.ACTION_VIEW);
+        intent.setData(host.getUri());
+        parent.startActivity(intent);
+    }
+
+
+    public synchronized void cursorRequest() {
+        cursorMoved(CURSOR_REQUESTED);
+    }
+
+}