From 9c24eddf62f97f354c9715388e18859492f13e40 Mon Sep 17 00:00:00 2001
From: Kenny Root <kenny@the-b.org>
Date: Wed, 24 Jun 2009 19:18:35 +0000
Subject: Add in CHARSET (RFC 2066) support to Telnet transport

git-svn-id: https://connectbot.googlecode.com/svn/trunk/connectbot@329 df292f66-193f-0410-a5fc-6d59da041ff2
---
 src/de/mud/telnet/TelnetProtocolHandler.java   | 31 ++++++++++++++++++++++++++
 src/org/connectbot/service/Relay.java          |  4 ++++
 src/org/connectbot/service/TerminalBridge.java |  8 +++++++
 src/org/connectbot/transport/Telnet.java       | 10 +++++++++
 4 files changed, 53 insertions(+)

(limited to 'src')

diff --git a/src/de/mud/telnet/TelnetProtocolHandler.java b/src/de/mud/telnet/TelnetProtocolHandler.java
index fd4d034..74f08bb 100644
--- a/src/de/mud/telnet/TelnetProtocolHandler.java
+++ b/src/de/mud/telnet/TelnetProtocolHandler.java
@@ -91,6 +91,11 @@ public abstract class TelnetProtocolHandler {
    */
   protected abstract void write(byte[] b) throws IOException;
 
+  /**
+   * Read the charset name from terminal.
+   */
+  protected abstract String getCharsetName();
+
   /**
    * Send one byte to the remote host.
    * @param b the byte to be sent
@@ -167,6 +172,8 @@ public abstract class TelnetProtocolHandler {
   private final static byte TELOPT_NAWS  = (byte)31;  /* NA-WindowSize*/
   /** Telnet option: Terminal Type */
   private final static byte TELOPT_TTYPE  = (byte)24;  /* terminal type */
+  /** Telnet option: CHARSET */
+  private final static byte TELOPT_CHARSET= (byte)42;  /* charset */
 
   private final static byte[] IACWILL  = { IAC, WILL };
   private final static byte[] IACWONT  = { IAC, WONT };
@@ -175,6 +182,9 @@ public abstract class TelnetProtocolHandler {
   private final static byte[] IACSB  = { IAC, SB };
   private final static byte[] IACSE  = { IAC, SE };
 
+  private final static byte CHARSET_ACCEPTED = (byte)2;
+  private final static byte CHARSET_REJECTED = (byte)3;
+
   /** Telnet option qualifier 'IS' */
   private final static byte TELQUAL_IS = (byte)0;
   /** Telnet option qualifier 'SEND' */
@@ -242,7 +252,28 @@ public abstract class TelnetProtocolHandler {
         write(ttype.getBytes());
         write(IACSE);
       }
+      break;
+    case TELOPT_CHARSET:
+        System.out.println("Got SB CHARSET");
 
+      String charsetStr = new String(sbdata, "US-ASCII");
+      if (charsetStr.startsWith("TTABLE ")) {
+        charsetStr = charsetStr.substring(7);
+      }
+      String[] charsets = charsetStr.split(charsetStr.substring(0,0));
+      String myCharset = getCharsetName();
+      for (String charset : charsets) {
+        if (charset.equals(myCharset)) {
+          write(IACSB);write(TELOPT_CHARSET);write(CHARSET_ACCEPTED);
+          write(charset.getBytes());
+          write(IACSE);
+          System.out.println("Sent our charset!");
+          return;
+        }
+      }
+      write(IACSB);write(TELOPT_CHARSET);write(CHARSET_REJECTED);
+      write(IACSE);
+      break;
     }
   }
 
diff --git a/src/org/connectbot/service/Relay.java b/src/org/connectbot/service/Relay.java
index 8cf9bf9..746a915 100644
--- a/src/org/connectbot/service/Relay.java
+++ b/src/org/connectbot/service/Relay.java
@@ -84,6 +84,10 @@ public class Relay implements Runnable {
 		}
 	}
 
+	public Charset getCharset() {
+		return currentCharset;
+	}
+
 	public void run() {
 		byteBuffer = ByteBuffer.allocate(BUFFER_SIZE);
 		charBuffer = CharBuffer.allocate(BUFFER_SIZE);
diff --git a/src/org/connectbot/service/TerminalBridge.java b/src/org/connectbot/service/TerminalBridge.java
index 28fd821..b0d4dbe 100644
--- a/src/org/connectbot/service/TerminalBridge.java
+++ b/src/org/connectbot/service/TerminalBridge.java
@@ -19,6 +19,7 @@
 package org.connectbot.service;
 
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -303,6 +304,13 @@ public class TerminalBridge implements VDUDisplay, OnKeyListener {
 		return responses;
 	}
 
+	/**
+	 * @return charset in use by bridge
+	 */
+	public Charset getCharset() {
+		return relay.getCharset();
+	}
+
 	/**
 	 * Sets the encoding used by the terminal. If the connection is live,
 	 * then the character set is changed for the next read.
diff --git a/src/org/connectbot/transport/Telnet.java b/src/org/connectbot/transport/Telnet.java
index 681da45..05f31b6 100644
--- a/src/org/connectbot/transport/Telnet.java
+++ b/src/org/connectbot/transport/Telnet.java
@@ -24,6 +24,7 @@ import java.io.OutputStream;
 import java.net.Socket;
 import java.net.SocketException;
 import java.net.UnknownHostException;
+import java.nio.charset.Charset;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -98,6 +99,15 @@ public class Telnet extends AbsTransport {
 			@Override
 			public void notifyEndOfRecord() {
 			}
+
+			@Override
+			protected String getCharsetName() {
+				Charset charset = bridge.getCharset();
+				if (charset != null)
+					return charset.name();
+				else
+					return "";
+			}
 		};
 	}
 
-- 
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