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1 package myVncClient;
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2 //
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3 // Copyright (C) 2002 Constantin Kaplinsky. All Rights Reserved.
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4 //
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5 // This is free software; you can redistribute it and/or modify
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6 // it under the terms of the GNU General Public License as published by
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7 // the Free Software Foundation; either version 2 of the License, or
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8 // (at your option) any later version.
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9 //
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10 // This software is distributed in the hope that it will be useful,
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11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 // GNU General Public License for more details.
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14 //
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15 // You should have received a copy of the GNU General Public License
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16 // along with this software; if not, write to the Free Software
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17 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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18 // USA.
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19 //
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20
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21 //
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22 // SessionRecorder is a class to write FBS (FrameBuffer Stream) files.
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23 // FBS files are used to save RFB sessions for later playback.
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24 //
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25
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26 import java.io.*;
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27
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28 class SessionRecorder {
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29
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30 protected FileOutputStream f;
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31 protected DataOutputStream df;
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32 protected long startTime, lastTimeOffset;
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33
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34 protected byte[] buffer;
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35 protected int bufferSize;
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36 protected int bufferBytes;
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37
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38 public SessionRecorder(String name, int bufsize) throws IOException {
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39 f = new FileOutputStream(name);
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40 df = new DataOutputStream(f);
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41 startTime = System.currentTimeMillis();
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42 lastTimeOffset = 0;
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43
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44 bufferSize = bufsize;
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45 bufferBytes = 0;
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46 buffer = new byte[bufferSize];
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47 }
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48
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49 public SessionRecorder(String name) throws IOException {
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50 this(name, 65536);
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51 }
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52
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53 //
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54 // Close the file, free resources.
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55 //
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56
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57 public void close() throws IOException {
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58 try {
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59 flush();
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60 } catch (IOException e) {
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61 }
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62
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63 df = null;
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64 f.close();
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65 f = null;
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66 buffer = null;
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67 }
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68
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69 //
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70 // Write the FBS file header as defined in the rfbproxy utility.
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71 //
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72
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73 public void writeHeader() throws IOException {
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74 df.write("FBS 001.000\n".getBytes());
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75 }
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76
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77 //
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78 // Write one byte.
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79 //
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80
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81 public void writeByte(int b) throws IOException {
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82 prepareWriting();
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83 buffer[bufferBytes++] = (byte)b;
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84 }
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85
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86 //
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87 // Write 16-bit value, big-endian.
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88 //
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89
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90 public void writeShortBE(int v) throws IOException {
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91 prepareWriting();
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92 buffer[bufferBytes++] = (byte)(v >> 8);
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93 buffer[bufferBytes++] = (byte)v;
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94 }
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95
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96 //
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97 // Write 32-bit value, big-endian.
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98 //
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99
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100 public void writeIntBE(int v) throws IOException {
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101 prepareWriting();
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102 buffer[bufferBytes] = (byte)(v >> 24);
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103 buffer[bufferBytes + 1] = (byte)(v >> 16);
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104 buffer[bufferBytes + 2] = (byte)(v >> 8);
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105 buffer[bufferBytes + 3] = (byte)v;
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106 bufferBytes += 4;
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107 }
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108
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109 //
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110 // Write 16-bit value, little-endian.
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111 //
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112
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113 public void writeShortLE(int v) throws IOException {
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114 prepareWriting();
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115 buffer[bufferBytes++] = (byte)v;
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116 buffer[bufferBytes++] = (byte)(v >> 8);
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117 }
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118
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119 //
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120 // Write 32-bit value, little-endian.
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121 //
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122
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123 public void writeIntLE(int v) throws IOException {
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124 prepareWriting();
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125 buffer[bufferBytes] = (byte)v;
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126 buffer[bufferBytes + 1] = (byte)(v >> 8);
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127 buffer[bufferBytes + 2] = (byte)(v >> 16);
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128 buffer[bufferBytes + 3] = (byte)(v >> 24);
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129 bufferBytes += 4;
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130 }
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131
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132 //
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133 // Write byte arrays.
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134 //
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135
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136 public void write(byte b[], int off, int len) throws IOException {
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137 prepareWriting();
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138 while (len > 0) {
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139 if (bufferBytes > bufferSize - 4)
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140 flush(false);
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141
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142 int partLen;
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143 if (bufferBytes + len > bufferSize) {
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144 partLen = bufferSize - bufferBytes;
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145 } else {
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146 partLen = len;
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147 }
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148 System.arraycopy(b, off, buffer, bufferBytes, partLen);
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149 bufferBytes += partLen;
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150 off += partLen;
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151 len -= partLen;
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152 }
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153 }
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154
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155 public void write(byte b[]) throws IOException {
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156 write(b, 0, b.length);
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157 }
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158
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159 //
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160 // Flush the output. This method saves buffered data in the
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161 // underlying file object adding data sizes and timestamps. If the
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162 // updateTimeOffset is set to false, then the current time offset
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163 // will not be changed for next write operation.
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164 //
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165
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166 public void flush(boolean updateTimeOffset) throws IOException {
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167 if (bufferBytes > 0) {
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168 df.writeInt(bufferBytes);
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169 df.write(buffer, 0, (bufferBytes + 3) & 0x7FFFFFFC);
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170 df.writeInt((int)lastTimeOffset);
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171 bufferBytes = 0;
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172 if (updateTimeOffset)
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173 lastTimeOffset = -1;
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174 }
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175 }
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176
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177 public void flush() throws IOException {
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178 flush(true);
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179 }
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180
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181 //
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182 // Before writing any data, remember time offset and flush the
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183 // buffer before it becomes full.
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184 //
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185
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186 protected void prepareWriting() throws IOException {
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187 if (lastTimeOffset == -1)
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188 lastTimeOffset = System.currentTimeMillis() - startTime;
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189 if (bufferBytes > bufferSize - 4)
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190 flush(false);
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191 }
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192
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193 }
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194
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