1 | import org.apache.tools.ant.*;
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2 | import org.apache.tools.ant.taskdefs.*;
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3 | import java.util.*;
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4 | import java.io.*;
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5 | import java.util.regex.*;
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6 |
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7 | /**
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8 | * Splits a file (resource) into chunks of a given size and puts them in files
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9 | * with the same name as the resource but appended with a dot followed by the chunk number
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10 | */
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11 | public class SplitResource extends Task {
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12 |
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13 | private File resource = null;
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14 | private File resourceScript = null;
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15 | private File outputDir = null;
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16 | private String resourceName = null;
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17 | private String resourceType = null;
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18 | private int chunkSize = 0;
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19 |
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20 |
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21 | /**
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22 | * for testing
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23 | */
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24 | public static void main( String[] args ) {
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25 |
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26 | SplitResource sr = new SplitResource();
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27 | sr.setResource( new File(args[0]) );
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28 | sr.setOutputDir( new File(args[1]) );
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29 | sr.setResourceScript( new File(args[2]) );
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30 | sr.setResourceName( args[3] );
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31 | sr.setResourceType( args[4] );
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32 | sr.setChunkSize( Integer.parseInt(args[5]) );
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33 | sr.execute();
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34 |
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35 | }
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36 |
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37 | public void execute() {
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38 |
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39 | if ( resource == null ) {
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40 | throw new BuildException( "Error - No resource specified !!" );
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41 | }
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42 |
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43 | if ( outputDir == null ) {
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44 | outputDir = new File(".");
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45 | }
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46 | outputDir.mkdir();
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47 |
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48 | if ( chunkSize == 0 ) {
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49 | throw new BuildException( "Error - No chunk size specified !!" );
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50 | }
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51 |
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52 | DataInputStream is;
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53 |
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54 | try {
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55 | is = new DataInputStream( new FileInputStream( resource ) );
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56 | } catch ( IOException e ) {
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57 | throw new BuildException( "Error - couldn't open the resource file" );
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58 | }
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59 |
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60 | //figure out how many chunks to do this in
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61 | int noChunks = (int)(resource.length() / chunkSize) + 1;
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62 |
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63 | System.out.println( "Splitting file into chunks" );
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64 | System.out.println( "file: " + resource.getAbsolutePath() );
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65 | System.out.println( "file size: " + resource.length() );
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66 | System.out.println( "chunk size: " + chunkSize );
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67 | System.out.println( "ergo, num chunks: " + noChunks );
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68 |
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69 | long written = 0;
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70 | for ( int i=0; i<noChunks; i++ ) {
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71 |
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72 | //open a file for output
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73 | DataOutputStream os;
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74 | File partFile = new File( outputDir, resource.getName() + "." + i );
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75 | //System.out.println( "partFile: " + partFile );
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76 |
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77 | try {
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78 | os = new DataOutputStream( new FileOutputStream( partFile ) );
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79 | } catch ( IOException e ) {
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80 | throw new BuildException( "Error - couldn't create a part file" );
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81 | }
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82 |
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83 |
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84 | //sort out thisChunkSize
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85 | int thisChunkSize = chunkSize;
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86 | if ( i == noChunks - 1 ) {
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87 | //System.out.println( "(Last Chunk)");
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88 | thisChunkSize = (int)(resource.length() % chunkSize);
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89 | }
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90 |
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91 | //System.out.println( "Read a chunk (" + thisChunkSize + " bytes)" );
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92 | byte[] data = new byte[thisChunkSize];
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93 | try {
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94 | is.readFully( data, 0, thisChunkSize );
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95 | } catch( EOFException eof ) {
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96 | throw new BuildException( "Error - unexpectedly hit the end of the resource file" );
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97 | } catch ( IOException e ) {
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98 | throw new BuildException( "Error - couldn't read a byte from the resource file" );
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99 | }
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100 |
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101 | //System.out.println( "Write to the file");
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102 | try {
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103 | os.write( data, 0, thisChunkSize );
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104 | written += thisChunkSize;
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105 | } catch ( IOException e ) {
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106 | throw new BuildException( "Error - couldn't write out a byte to the part file" );
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107 | }
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108 |
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109 | try {
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110 | os.close();
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111 | } catch ( IOException e ) {
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112 | throw new BuildException( "Error - couldn't close a chunk output stream" );
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113 | }
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114 |
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115 | }
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116 |
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117 | //System.out.println( "Total written: " + written + " bytes" );
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118 |
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119 | try {
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120 | is.close();
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121 | } catch ( IOException e ) {
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122 | throw new BuildException( "Error - couldn't close the input stream" );
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123 | }
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124 |
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125 |
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126 | //if they have specified a resource script and resource name, write an rc file
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127 | if ( resourceScript != null && resourceName != null && resourceType != null ) {
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128 | System.out.println( "Putting references into a resource script" );
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129 | System.out.println( "resourceScript: " + resourceScript.getAbsolutePath() );
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130 | System.out.println( "resourceName : " + resourceName );
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131 | System.out.println( "resourceType : " + resourceType );
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132 |
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133 | //open the resource script
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134 | PrintWriter out = null;
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135 | try {
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136 | out = new PrintWriter(new FileWriter( resourceScript, true ));
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137 | } catch ( IOException e ) {
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138 | throw new BuildException( "Error - couldn't open the resource script" );
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139 | }
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140 |
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141 | //put a line in for each chunk
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142 | for ( int i=0; i<noChunks; i++ ){
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143 | out.println(
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144 | resourceName + "_" + i + " " + resourceType + " \"" + resource.getName() + "." + i + "\""
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145 | );
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146 | }
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147 |
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148 | //close the resource script
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149 | out.close();
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150 |
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151 | }
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152 |
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153 | }
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154 |
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155 |
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156 | public void setResource(File resource) {
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157 | this.resource = resource;
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158 | }
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159 |
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160 | public void setResourceScript(File resourceScript) {
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161 | this.resourceScript = resourceScript;
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162 | }
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163 |
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164 | public void setResourceName(String resourceName) {
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165 | this.resourceName = resourceName;
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166 | }
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167 | public void setResourceType(String resourceType) {
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168 | this.resourceType = resourceType;
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169 | }
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170 |
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171 | public void setOutputDir(File outputDir) {
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172 | this.outputDir = outputDir;
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173 | }
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174 |
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175 | public void setChunkSize(int chunkSize) {
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176 | this.chunkSize = chunkSize;
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177 | }
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178 |
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179 | }
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