src/com/googlecode/lanterna/terminal/ansi/TelnetProtocol.java

   1 /*
   2  * This file is part of lanterna (http://code.google.com/p/lanterna/).
   3  *
   4  * lanterna is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Copyright (C) 2010-2015 Martin
  18  */
  19 package com.googlecode.lanterna.terminal.ansi;
  20
  21 import java.lang.reflect.Field;
  22 import java.util.Collections;
  23 import java.util.HashMap;
  24 import java.util.Map;
  25
  26 /**
  27  * Contains the telnet protocol commands, although not a complete set.
  28  * @author Martin
  29  */
  30 class TelnetProtocol {
  31     public static final byte COMMAND_SUBNEGOTIATION_END = (byte)0xf0;  //SE
  32     public static final byte COMMAND_NO_OPERATION = (byte)0xf1;    //NOP
  33     public static final byte COMMAND_DATA_MARK = (byte)0xf2;   //DM
  34     public static final byte COMMAND_BREAK = (byte)0xf3;       //BRK
  35     public static final byte COMMAND_INTERRUPT_PROCESS = (byte)0xf4;   //IP
  36     public static final byte COMMAND_ABORT_OUTPUT = (byte)0xf5;    //AO
  37     public static final byte COMMAND_ARE_YOU_THERE = (byte)0xf6;   //AYT
  38     public static final byte COMMAND_ERASE_CHARACTER = (byte)0xf7; //EC
  39     public static final byte COMMAND_ERASE_LINE = (byte)0xf8;  //WL
  40     public static final byte COMMAND_GO_AHEAD = (byte)0xf9;    //GA
  41     public static final byte COMMAND_SUBNEGOTIATION = (byte)0xfa;  //SB
  42     public static final byte COMMAND_WILL = (byte)0xfb;
  43     public static final byte COMMAND_WONT = (byte)0xfc;
  44     public static final byte COMMAND_DO = (byte)0xfd;
  45     public static final byte COMMAND_DONT = (byte)0xfe;
  46     public static final byte COMMAND_IAC = (byte)0xff;
  47
  48     public static final byte OPTION_TRANSMIT_BINARY = (byte)0x00;
  49     public static final byte OPTION_ECHO = (byte)0x01;
  50     public static final byte OPTION_SUPPRESS_GO_AHEAD = (byte)0x03;
  51     public static final byte OPTION_STATUS = (byte)0x05;
  52     public static final byte OPTION_TIMING_MARK = (byte)0x06;
  53     public static final byte OPTION_NAOCRD = (byte)0x0a;
  54     public static final byte OPTION_NAOHTS = (byte)0x0b;
  55     public static final byte OPTION_NAOHTD = (byte)0x0c;
  56     public static final byte OPTION_NAOFFD = (byte)0x0d;
  57     public static final byte OPTION_NAOVTS = (byte)0x0e;
  58     public static final byte OPTION_NAOVTD = (byte)0x0f;
  59     public static final byte OPTION_NAOLFD = (byte)0x10;
  60     public static final byte OPTION_EXTEND_ASCII = (byte)0x01;
  61     public static final byte OPTION_TERMINAL_TYPE = (byte)0x18;
  62     public static final byte OPTION_NAWS = (byte)0x1f;
  63     public static final byte OPTION_TERMINAL_SPEED = (byte)0x20;
  64     public static final byte OPTION_TOGGLE_FLOW_CONTROL = (byte)0x21;
  65     public static final byte OPTION_LINEMODE = (byte)0x22;
  66     public static final byte OPTION_AUTHENTICATION = (byte)0x25;
  67
  68     public static final Map<String, Byte> NAME_TO_CODE = createName2CodeMap();
  69     public static final Map<Byte, String> CODE_TO_NAME = reverseMap(NAME_TO_CODE);
  70
  71     private static Map<String, Byte> createName2CodeMap() {
  72         Map<String, Byte> result = new HashMap<String, Byte>();
  73         for(Field field: TelnetProtocol.class.getDeclaredFields()) {
  74             if(field.getType() != byte.class || (!field.getName().startsWith("COMMAND_") && !field.getName().startsWith("OPTION_"))) {
  75                 continue;
  76             }
  77             try {
  78                 String namePart = field.getName().substring(field.getName().indexOf("_") + 1);
  79                 result.put(namePart, (Byte)field.get(null));
  80             }
  81             catch(IllegalAccessException ignored) {
  82             }
  83             catch(IllegalArgumentException ignored) {
  84             }
  85         }
  86         return Collections.unmodifiableMap(result);
  87     }
  88
  89     private static <V,K> Map<V,K> reverseMap(Map<K,V> n2c) {
  90         Map<V, K> result = new HashMap<V,K>();
  91         for (Map.Entry<K, V> e : n2c.entrySet()) {
  92             result.put(e.getValue(), e.getKey());
  93         }
  94         return Collections.unmodifiableMap(result);
  95     }
  96     /** Cannot instantiate. */
  97     private TelnetProtocol() {}
  98 }