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/*
* ConnectBot: simple, powerful, open-source SSH client for Android
* Copyright 2007 Kenny Root, Jeffrey Sharkey
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.connectbot.service;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
import org.apache.harmony.niochar.charset.additional.IBM437;
import org.connectbot.transport.AbsTransport;
import org.connectbot.util.EastAsianWidth;
import android.util.Log;
import de.mud.terminal.vt320;
/**
* @author Kenny Root
*/
public class Relay implements Runnable {
private static final String TAG = "CB.Relay";
private static final int BUFFER_SIZE = 4096;
private TerminalBridge bridge;
private Charset currentCharset;
private CharsetDecoder decoder;
private AbsTransport transport;
private vt320 buffer;
private ByteBuffer byteBuffer;
private CharBuffer charBuffer;
private byte[] byteArray;
private char[] charArray;
public Relay(TerminalBridge bridge, AbsTransport transport, vt320 buffer, String encoding) {
setCharset(encoding);
this.bridge = bridge;
this.transport = transport;
this.buffer = buffer;
}
public void setCharset(String encoding) {
Log.d("ConnectBot.Relay", "changing charset to " + encoding);
Charset charset;
if (encoding.equals("CP437"))
charset = new IBM437("IBM437",
new String[] { "IBM437", "CP437" });
else
charset = Charset.forName(encoding);
if (charset == currentCharset || charset == null)
return;
CharsetDecoder newCd = charset.newDecoder();
newCd.onUnmappableCharacter(CodingErrorAction.REPLACE);
newCd.onMalformedInput(CodingErrorAction.REPLACE);
currentCharset = charset;
synchronized (this) {
decoder = newCd;
}
}
public Charset getCharset() {
return currentCharset;
}
public void run() {
byteBuffer = ByteBuffer.allocate(BUFFER_SIZE);
charBuffer = CharBuffer.allocate(BUFFER_SIZE);
/* for East Asian character widths */
byte[] wideAttribute = new byte[BUFFER_SIZE];
byteArray = byteBuffer.array();
charArray = charBuffer.array();
CoderResult result;
int bytesRead = 0;
byteBuffer.limit(0);
int bytesToRead;
int offset;
int charWidth;
EastAsianWidth measurer = EastAsianWidth.getInstance();
try {
while (true) {
charWidth = bridge.charWidth;
bytesToRead = byteBuffer.capacity() - byteBuffer.limit();
offset = byteBuffer.arrayOffset() + byteBuffer.limit();
bytesRead = transport.read(byteArray, offset, bytesToRead);
if (bytesRead > 0) {
byteBuffer.limit(byteBuffer.limit() + bytesRead);
synchronized (this) {
result = decoder.decode(byteBuffer, charBuffer, false);
}
if (result.isUnderflow() &&
byteBuffer.limit() == byteBuffer.capacity()) {
byteBuffer.compact();
byteBuffer.limit(byteBuffer.position());
byteBuffer.position(0);
}
offset = charBuffer.position();
measurer.measure(charArray, 0, offset, wideAttribute, bridge.defaultPaint, charWidth);
buffer.putString(charArray, wideAttribute, 0, charBuffer.position());
bridge.propagateConsoleText(charArray, charBuffer.position());
charBuffer.clear();
bridge.redraw();
}
}
} catch (IOException e) {
Log.e(TAG, "Problem while handling incoming data in relay thread", e);
}
}
}
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