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1 /*
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2 * ConnectBot: simple, powerful, open-source SSH client for Android
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3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
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4 *
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5 * Licensed under the Apache License, Version 2.0 (the "License");
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6 * you may not use this file except in compliance with the License.
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7 * You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package com.five_ten_sg.connectbot.service;
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19
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20 import java.io.IOException;
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21 import java.nio.ByteBuffer;
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22 import java.nio.CharBuffer;
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23 import java.nio.charset.Charset;
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24 import java.nio.charset.CharsetDecoder;
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25 import java.nio.charset.CoderResult;
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26 import java.nio.charset.CodingErrorAction;
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27
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28 import org.apache.harmony.niochar.charset.additional.IBM437;
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29
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30 import com.five_ten_sg.connectbot.transport.AbsTransport;
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31 import android.graphics.Paint;
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32 import android.text.AndroidCharacter;
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33 import android.util.Log;
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34 import de.mud.terminal.vt320;
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35
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36 /**
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37 * @author Kenny Root
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38 */
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39 public class Relay implements Runnable {
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40 private static final String TAG = "ConnectBot.Relay";
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41
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42 private static final int BUFFER_SIZE = 4096;
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43
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44 private TerminalBridge bridge;
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45
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46 private Charset currentCharset;
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47 private CharsetDecoder decoder;
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48
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49 private AbsTransport transport;
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50
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51 private vt320 buffer;
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52
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53 private ByteBuffer byteBuffer;
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54 private CharBuffer charBuffer;
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55
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56 private byte[] byteArray;
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57 private char[] charArray;
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58
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59 private void eastAsianWidthMeasure(char[] charArray, int start, int end,
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60 byte[] wideAttribute, Paint paint, int charWidth) {
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61 AndroidCharacter.getEastAsianWidths(charArray, start, end - start, wideAttribute);
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62 }
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63
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64 public Relay(TerminalBridge bridge, AbsTransport transport, vt320 buffer, String encoding) {
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65 setCharset(encoding);
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66 this.bridge = bridge;
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67 this.transport = transport;
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68 this.buffer = buffer;
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69 }
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70
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71 public void setCharset(String encoding) {
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72 Log.d("ConnectBot.Relay", "changing charset to " + encoding);
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73 Charset charset;
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74
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75 if (encoding.equals("CP437"))
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76 charset = new IBM437("IBM437",
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77 new String[] { "IBM437", "CP437" });
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78 else
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79 charset = Charset.forName(encoding);
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80
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81 if (charset == currentCharset || charset == null)
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82 return;
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83
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84 CharsetDecoder newCd = charset.newDecoder();
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85 newCd.onUnmappableCharacter(CodingErrorAction.REPLACE);
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86 newCd.onMalformedInput(CodingErrorAction.REPLACE);
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87 currentCharset = charset;
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88
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89 synchronized (this) {
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90 decoder = newCd;
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91 }
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92 }
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93
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94 public Charset getCharset() {
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95 return currentCharset;
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96 }
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97
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98 public void run() {
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99 byteBuffer = ByteBuffer.allocate(BUFFER_SIZE);
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100 charBuffer = CharBuffer.allocate(BUFFER_SIZE);
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101 /* for East Asian character widths */
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102 byte[] wideAttribute = new byte[BUFFER_SIZE];
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103 byteArray = byteBuffer.array();
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104 charArray = charBuffer.array();
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105 CoderResult result;
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106 int bytesRead = 0;
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107 byteBuffer.limit(0);
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108 int bytesToRead;
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109 int offset;
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110 int charWidth;
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111
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112 try {
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113 while (true) {
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114 charWidth = bridge.charWidth;
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115 bytesToRead = byteBuffer.capacity() - byteBuffer.limit();
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116 offset = byteBuffer.arrayOffset() + byteBuffer.limit();
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117 if (transport.willBlock()) buffer.testChanged();
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118 bytesRead = transport.read(byteArray, offset, bytesToRead);
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119
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120 if (bytesRead > 0) {
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121 byteBuffer.limit(byteBuffer.limit() + bytesRead);
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122
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123 synchronized (this) {
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124 result = decoder.decode(byteBuffer, charBuffer, false);
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125 }
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126
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127 if (result.isUnderflow() &&
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128 byteBuffer.limit() == byteBuffer.capacity()) {
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129 byteBuffer.compact();
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130 byteBuffer.limit(byteBuffer.position());
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131 byteBuffer.position(0);
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132 }
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133
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134 offset = charBuffer.position();
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135 eastAsianWidthMeasure(charArray, 0, offset, wideAttribute, bridge.defaultPaint, charWidth);
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136 buffer.putString(charArray, wideAttribute, 0, charBuffer.position());
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137 bridge.propagateConsoleText(charArray, charBuffer.position());
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138 charBuffer.clear();
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139 bridge.redraw();
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140 }
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141 }
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142 }
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143 catch (IOException e) {
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144 Log.e(TAG, "Problem while handling incoming data in relay thread", e);
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145 }
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146 }
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147 }
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