src/org/xwt/translators/MSPack.java

   1 package org.xwt.translators;
   2
   3 import org.xwt.Main;
   4 import org.xwt.util.*;
   5 import org.xwt.mips.*;
   6 import java.io.*;
   7
   8 public class MSPack {
   9     private static byte[] image;
  10
  11     private String[] fileNames;
  12     private int[] lengths;
  13     private byte[][] data;
  14
  15     public static class MSPackException extends IOException { public MSPackException(String s) { super(s); } }
  16
  17     private static synchronized byte[] getImage() {
  18         if (image == null)
  19             image = InputStreamToByteArray.convert(Main.builtin.getInputStream("libmspack.mips"));
  20         return image;
  21     }
  22
  23     public MSPack(InputStream cabIS) throws IOException {
  24         byte[] cab = InputStreamToByteArray.convert(cabIS);
  25         Interpreter vm = new Interpreter(getImage());
  26
  27         int cabAddr = vm.sbrk(cab.length);
  28         if(cabAddr < 0) throw new MSPackException("sbrk failed");
  29
  30         try {
  31             vm.copyout(cab,cabAddr,cab.length);
  32
  33             vm.setUserInfo(0,cabAddr);
  34             vm.setUserInfo(1,cab.length);
  35
  36             int status = vm.run(new String[]{ "mspack.mips"} );
  37             if(status != 0) throw new MSPackException("mspack.mips failed (" + status + ")");
  38
  39             /*static struct {
  40                 char *filename;
  41                 char *data;
  42                 int length;
  43             } output_table[MAX_MEMBERS+1]; */
  44
  45             int filesTable = vm.getUserInfo(2);
  46             int count=0;
  47             while(vm.memRead(filesTable+count*12) != 0) count++;
  48
  49             fileNames = new String[count];
  50             data = new byte[count][];
  51             lengths = new int[count];
  52
  53             for(int i=0,addr=filesTable;i<count;i++,addr+=12) {
  54                 int length = vm.memRead(addr+8);
  55                 data[i] = new byte[length];
  56                 lengths[i] = length;
  57                 fileNames[i] = vm.cstring(vm.memRead(addr));
  58                 System.out.println("" + fileNames[i]);
  59                 vm.copyin(vm.memRead(addr+4),data[i],length);
  60             }
  61         } catch(VM.EmulationException e) {
  62             e.printStackTrace();
  63             throw new MSPackException("mspack.mips crashed");
  64         }
  65     }
  66
  67     public String[] getFileNames() { return fileNames; }
  68     public int[] getLengths() { return lengths; }
  69     public InputStream getInputStream(int index) { return new ByteArrayInputStream(data[index]); }
  70     public InputStream getInputStream(String fileName) {
  71         for(int i=0;i<fileNames.length;i++) {
  72             if(fileName.equalsIgnoreCase(fileNames[i])) return getInputStream(i);
  73         }
  74         return null;
  75     }
  76
  77     public static void main(String[] args) throws IOException {
  78         MSPack pack = new MSPack(new FileInputStream(args[0]));
  79         String[] files = pack.getFileNames();
  80         for(int i=0;i<files.length;i++)
  81             System.out.println(i + ": " + files[i] + ": " + pack.getLengths()[i]);
  82         System.out.println("Writing " + files[files.length-1]);
  83         InputStream is = pack.getInputStream(files.length-1);
  84         OutputStream os = new FileOutputStream(files[files.length-1]);
  85         int n;
  86         byte[] buf = new byte[4096];
  87         while((n = is.read(buf)) != -1) os.write(buf,0,n);
  88         os.close();
  89         is.close();
  90     }
  91 }
  92