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annotate app/src/main/java/org/tn5250j/framework/tn5250/DataStreamProducer.java @ 518:9acc51a5a98f

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Added tag stable-1.9.4-6 for changeset 947ea334735d
author Carl Byington <carl@five-ten-sg.com>
date Fri, 31 May 2024 13:35:44 -0600
parents 5ce5235adde6
children
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1 package org.tn5250j.framework.tn5250;
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2
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3 import org.tn5250j.encoding.ICodePage;
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4
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5 import java.io.BufferedInputStream;
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6 import java.io.ByteArrayOutputStream;
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7 import java.io.IOException;
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8 import java.net.SocketException;
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9 import java.util.concurrent.BlockingQueue;
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11 import static org.tn5250j.framework.tn5250.Stream5250.OPCODE_OFFSET;
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12
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13 import java.util.Timer;
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14 import java.util.TimerTask;
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16 import android.util.Log;
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19 public class DataStreamProducer implements Runnable {
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20 private static final int MINIMAL_PARTIAL_STREAM_LEN = 2;
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21 private static final String TAG = "DataStreamProducer";
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22 private tnvt vt;
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23 private BufferedInputStream bin;
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24 private ByteArrayOutputStream baosin;
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25 private byte[] saveStream;
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26 private final BlockingQueue<Object> dsq;
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27 private byte[] dataStream;
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28 private DataStreamDumper dataStreamDumper = new DataStreamDumper();
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32 public DataStreamProducer(tnvt vt, BufferedInputStream bin, BlockingQueue<Object> queue, byte[] init) {
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33 this.bin = bin;
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34 this.vt = vt;
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35 baosin = new ByteArrayOutputStream();
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36 dsq = queue;
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37 dataStream = init;
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38 }
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40 public final void run() {
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41 boolean done = false;
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42 Thread me = Thread.currentThread();
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43 // load the first response screen
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44 loadStream(dataStream, 0);
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46 while (!done) {
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47 try {
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48 byte[] abyte0 = readIncoming();
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49
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50 // WVL - LDC : 17/05/2004 : Device name negotiations send TIMING MARK
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51 // Restructured to the readIncoming() method to return null
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52 // on TIMING MARK. Don't process in that case (abyte0 == null)!
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53 if (abyte0 != null) {
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54 // WVL - LDC : 16/07/2003 : TR.000345
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55 // When the socket has been closed, the reading returns
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56 // no bytes (an empty byte arrray).
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57 // But the loadStream fails on this, so we check it here!
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58 if (abyte0.length > 0) {
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59 loadStream(abyte0, 0);
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60 }
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61 // WVL - LDC : 16/07/2003 : TR.000345
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62 // Returning no bytes means the input buffer has
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63 // reached end-of-stream, so we do a disconnect!
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64 else {
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65 done = true;
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66 vt.disconnect();
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67 }
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68 }
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69 }
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70 catch (SocketException se) {
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71 Log.w(TAG, " DataStreamProducer thread interrupted and stopping " + se.getMessage());
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72 done = true;
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73 }
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74 catch (IOException ioe) {
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75 Log.w(TAG, ioe.getMessage());
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76 if (me.isInterrupted()) done = true;
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77 }
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78 catch (Exception ex) {
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79 Log.w(TAG, ex.getMessage());
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80 if (me.isInterrupted()) done = true;
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81 }
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82 }
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83 }
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84
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85 private void loadStream(byte streamBuffer[], int offset) {
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86
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87 int partialLen = (streamBuffer[offset] & 0xff) << 8 | streamBuffer[offset + 1] & 0xff;
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88 int bufferLen = streamBuffer.length;
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89
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90 Log.d(TAG, "loadStream() offset=" + offset + " partialLen=" + partialLen + " bufferLen=" + bufferLen);
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91
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92 if (saveStream != null) {
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93 Log.d(TAG, "partial stream found");
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94 bufferLen = saveStream.length + streamBuffer.length;
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95 byte[] inter = new byte[bufferLen];
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96 System.arraycopy(saveStream, 0, inter, 0, saveStream.length);
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97 System.arraycopy(streamBuffer, 0, inter, saveStream.length, streamBuffer.length);
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98 streamBuffer = new byte[bufferLen];
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99 System.arraycopy(inter, 0, streamBuffer, 0, bufferLen);
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100 saveStream = null;
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101 }
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102
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103 if (partialLen > bufferLen) {
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104 saveStream = new byte[streamBuffer.length];
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105 Log.d(TAG, "partial stream saved");
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106 System.arraycopy(streamBuffer, 0, saveStream, 0, streamBuffer.length);
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107 } else {
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108 int buf_len = partialLen + 2;
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109 byte[] buf = new byte[buf_len];
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110 if (isBufferShifted(partialLen, bufferLen) && isOpcodeShifted(streamBuffer, offset)) {
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111 Log.d(TAG, "Invalid stream buffer detected. Ignoring the inserted byte.");
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112 System.arraycopy(streamBuffer, offset, buf, 0, MINIMAL_PARTIAL_STREAM_LEN);
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113 System.arraycopy(streamBuffer, offset + MINIMAL_PARTIAL_STREAM_LEN + 1, buf, MINIMAL_PARTIAL_STREAM_LEN, partialLen);
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114 } else {
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115 System.arraycopy(streamBuffer, offset, buf, 0, buf_len);
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116 }
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117 try {
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118 dsq.put(buf);
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119 if (streamBuffer.length > buf.length + offset + MINIMAL_PARTIAL_STREAM_LEN)
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120 loadStream(streamBuffer, offset + buf_len);
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121 } catch (InterruptedException ex) {
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122 Log.w(TAG, "load stream error.", ex);
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123 }
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124 }
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125 }
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126
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127 private boolean isOpcodeShifted(byte[] streamBuffer, int offset) {
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128 byte code = streamBuffer[offset + 1 + OPCODE_OFFSET];
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129 return (0 <= code && code <= 12);
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130 }
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131
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132 private boolean isBufferShifted(int partialLen, int bufferLen) {
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133 return partialLen + MINIMAL_PARTIAL_STREAM_LEN + 1 == bufferLen;
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134 }
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135
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136 public final byte[] readIncoming() throws IOException {
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137 boolean done = false;
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138 boolean negotiate = false;
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139 baosin.reset();
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140 int j = -1;
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141 Timer timer = new Timer("data.stream", true);
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142 TimerTask task = null;
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143
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144 while (!done) {
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145 if (bin.available() == 0) {
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146 task = new TimerTask() {
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147 public void run() {
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148 try {
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149 dsq.put(new Integer(0)); // trigger buffer.testChanged()
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150 }
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151 catch (Exception ex) {
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152 Log.w(TAG, "readIncoming error " + ex.getMessage());
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153 }
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154 }
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155 };
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156 timer.schedule(task, 10); // 10 ms delay
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157 }
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158
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159 int i = bin.read();
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160
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161 if (task != null) {
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162 task.cancel();
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163 task = null;
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164 }
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165
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166 // WVL - LDC : 16/07/2003 : TR.000345
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167 // The inStream return -1 when end-of-stream is reached. This
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168 // happens e.g. when the connection is closed from the AS/400.
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169 // So we stop in this case!
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170 // ==> an empty byte array is returned from this method.
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171 if (i == -1) { // nothing read!
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172 done = true;
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173 vt.disconnect();
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174 continue;
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175 }
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176
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177 // We use the values instead of the static values IAC and EOR
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178 // because they are defined as bytes.
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179 //
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180 // The > if(i != 255 || j != 255) < is a hack for the double FF FF's
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181 // that are being returned. I do not know why this is like this and
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182 // can not find any documentation for it. It is also being returned
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183 // on my Client Access tcp dump as well so they are handling it.
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184 //
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185 // my5250
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186 // 0000: 00 50 DA 44 C8 45 42 00 00 00 00 24 08 00 45 00 .P.D.EB....$..E.
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187 // 0010: 04 2A BC F9 00 00 40 06 D0 27 C1 A8 33 04 C1 A8 .*....@..'..3...
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188 // 0020: 33 58 00 17 04 18 6F A2 83 CB 00 1E D1 BA 50 18 3X....o.......P.
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189 // 0030: 20 00 8A 9A 00 00 03 FF FF 12 A0 00 00 04 00 00 ...............
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190 // --------------------------- || || -------------------------------------
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191 // 0040: 03 04 40 04 11 00 20 01 07 00 00 00 18 00 00 10 ..@... .........
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192
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193 if (j == 255 && i == 255) {
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194 j = -1;
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195 continue;
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196 }
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197
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198 baosin.write(i);
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199
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200 // check for end of record EOR and IAC - FFEF
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201 if (j == 255 && i == 239)
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202 done = true;
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203
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204 // This is to check for the TELNET TIMING MARK OPTION
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205 // rfc860 explains this in more detail. When we receive it
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206 // we will negotiate with the server by sending a WONT'T TIMING-MARK
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207 // This will let the server know that we processed the information
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208 // and are just waiting for the user to enter some data so keep the
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209 // socket alive. This is more or less a AYT (ARE YOU THERE) or not.
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210 if (i == 253 && j == 255) {
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211 done = true;
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212 negotiate = true;
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213 }
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214
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215 j = i;
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216 }
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217
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218 // after the initial negotiation we might get other options such as
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219 // timing marks ?????????????? do we ???????????? look at telnet spec
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220 // yes we do. rfc860 explains about timing marks.
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221 // WVL - LDC : 17/05/2004 : Device name negotiations send TIMING MARK
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222 // to existing device!
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223 // Handled incorrectly: we cannot continue processing the TIMING MARK DO
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224 // after we have handled it in the vt.negotiate()
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225 // We should not return the bytes;
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226 // ==> restructured to return null after negotiation!
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227 // Impacts the run method! Added the null check.
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228 byte[] rBytes = baosin.toByteArray();
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229
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230 dataStreamDumper.dump(rBytes);
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231
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232 if (negotiate) {
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233 if (bin.available() == 0) {
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234 task = new TimerTask() {
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235 public void run() {
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236 try {
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237 dsq.put(new Integer(0)); // trigger buffer.testChanged()
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238 }
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239 catch (Exception ex) {
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240 Log.w(TAG, "readIncoming error " + ex.getMessage());
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241 }
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242 }
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243 };
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244 timer.schedule(task, 10); // 10 ms delay
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245 }
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246
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247 // get the negotiation option
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248 baosin.write(bin.read());
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249
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250 if (task != null) {
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251 task.cancel();
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252 task = null;
392
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253 }
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254
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255 vt.negotiate(rBytes);
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256 return null;
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257 }
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258
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259 return rBytes;
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260 }
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261
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262 protected void toggleDebug(ICodePage codePage) {
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263 dataStreamDumper.toggleDebug(codePage);
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264 }
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265
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266 }