src/tests/MSPack.java

   1 package tests;
   2
   3 import org.ibex.nestedvm.Runtime;
   4 import java.io.*;
   5
   6 public class MSPack {
   7     private String[] fileNames;
   8     private int[] lengths;
   9     private byte[][] data;
  10
  11     public static class MSPackException extends IOException { public MSPackException(String s) { super(s); } }
  12
  13     public MSPack(InputStream cabIS) throws IOException {
  14         byte[] cab = InputStreamToByteArray.convert(cabIS);
  15         try {
  16             //Interpreter vm = new Interpreter("mspack.mips");
  17                         Runtime vm;
  18                         try {
  19                                  vm = (Runtime) Class.forName("tests.MSPackHelper").newInstance();
  20                         } catch(Exception e) {
  21                                 throw new MSPackException("couldn't instansiate MSPackHelper");
  22                         }
  23             int cabAddr = vm.sbrk(cab.length);
  24             if(cabAddr < 0) throw new MSPackException("sbrk failed");
  25
  26             vm.copyout(cab,cabAddr,cab.length);
  27
  28             vm.setUserInfo(0,cabAddr);
  29             vm.setUserInfo(1,cab.length);
  30
  31             int status = vm.run(new String[]{ "mspack.mips"} );
  32             if(status != 0) throw new MSPackException("mspack.mips failed (" + status + ")");
  33
  34             /*static struct {
  35                 char *filename;
  36                 char *data;
  37                 int length;
  38             } output_table[MAX_MEMBERS+1]; */
  39
  40             int filesTable = vm.getUserInfo(2);
  41             int count=0;
  42             while(vm.memRead(filesTable+count*12) != 0) count++;
  43
  44             fileNames = new String[count];
  45             data = new byte[count][];
  46             lengths = new int[count];
  47
  48             for(int i=0,addr=filesTable;i<count;i++,addr+=12) {
  49                 int length = vm.memRead(addr+8);
  50                 data[i] = new byte[length];
  51                 lengths[i] = length;
  52                 fileNames[i] = vm.cstring(vm.memRead(addr));
  53                 System.out.println("" + fileNames[i]);
  54                 vm.copyin(vm.memRead(addr+4),data[i],length);
  55             }
  56         } catch(Runtime.ExecutionException e) {
  57             e.printStackTrace();
  58             throw new MSPackException("mspack.mips crashed");
  59         }
  60     }
  61
  62     public String[] getFileNames() { return fileNames; }
  63     public int[] getLengths() { return lengths; }
  64     public InputStream getInputStream(int index) { return new ByteArrayInputStream(data[index]); }
  65     public InputStream getInputStream(String fileName) {
  66         for(int i=0;i<fileNames.length;i++) {
  67             if(fileName.equalsIgnoreCase(fileNames[i])) return getInputStream(i);
  68         }
  69         return null;
  70     }
  71
  72     public static void main(String[] args) throws IOException {
  73         MSPack pack = new MSPack(new FileInputStream(args[0]));
  74         String[] files = pack.getFileNames();
  75         for(int i=0;i<files.length;i++)
  76             System.out.println(i + ": " + files[i] + ": " + pack.getLengths()[i]);
  77         System.out.println("Writing " + files[files.length-1]);
  78         InputStream is = pack.getInputStream(files.length-1);
  79         OutputStream os = new FileOutputStream(files[files.length-1]);
  80         int n;
  81         byte[] buf = new byte[4096];
  82         while((n = is.read(buf)) != -1) os.write(buf,0,n);
  83         os.close();
  84         is.close();
  85     }
  86     private static class InputStreamToByteArray {
  87
  88         /** scratch space for isToByteArray() */
  89         private static byte[] workspace = new byte[16 * 1024];
  90         /** Trivial method to completely read an InputStream */
  91         public static synchronized byte[] convert(InputStream is) throws IOException {
  92             int pos = 0;
  93             while (true) {
  94                 int numread = is.read(workspace, pos, workspace.length - pos);
  95                 if (numread == -1) break;
  96                 else if (pos + numread < workspace.length) pos += numread;
  97                 else {
  98                     pos += numread;
  99                     byte[] temp = new byte[workspace.length * 2];
 100                     System.arraycopy(workspace, 0, temp, 0, workspace.length);
 101                     workspace = temp;
 102                 }
 103             }
 104             byte[] ret = new byte[pos];
 105             System.arraycopy(workspace, 0, ret, 0, pos);
 106             return ret;
 107         }
 108     }
 109 }
 110