#!/usr/bin/perl
$file="PFS.IMG";
$num=0;
$vshift=16;
$fnum=1024;

open(IN, $file);
binmode(IN);
sysread(IN,$buf,$vshift);
$fnum=ord(substr($buf,15,1))*256+ord(substr($buf,14,1));
print "$fnum files\n";

for($i=0;$i<$fnum;$i++){
  sysread(IN,$buf,52);
  for($j=0;$j<40;$j++){
    if(ord(substr($buf,$j,1))==0){
      last;
    }
  }
  $fn=substr($buf,0,$j);
  printf "$fn";
  $nname[$num]=$fn;
  for($j=0;$j<40-length($fn);$j++){
    printf " ";
  }
  $nsize[$num]=ord(substr($buf,51,1))*256*256*256+
               ord(substr($buf,50,1))*256*256+
               ord(substr($buf,49,1))*256+ord(substr($buf,48,1));
  $nstart[$num]=ord(substr($buf,47,1))*256*256*256+
                ord(substr($buf,46,1))*256*256+
                ord(substr($buf,45,1))*256+ord(substr($buf,44,1));
  printf (" %03d %03d",$nstart[$num],$nsize[$num]);
  $num++;
  printf "\n";
}

# reject zero file
for($i=0;$i<$num-1;$i++){
  if($nstart[$i]==0 && $nsize[$i]==0){
    $nstart[$i]=0xffffff;
  }
}

# sort file
for($i=0;$i<$num-1;$i++){
  for($j=0;$j<$num-$i-1;$j++){
    if($nstart[$j]>$nstart[$j+1]){
      $tmpname=$nname[$j];
      $tmpstart=$nstart[$j];
      $tmpsize=$nsize[$j];
      $nname[$j]=$nname[$j+1];
      $nstart[$j]=$nstart[$j+1];
      $nsize[$j]=$nsize[$j+1];
      $nname[$j+1]=$tmpname;
      $nstart[$j+1]=$tmpstart;
      $nsize[$j+1]=$tmpsize;
    }
  }
}

for($i=0;$i<$num;$i++){
  if($nsize[$i]==0){
    next;
  }
  sysread(IN,$buf,$nsize[$i]);
  $nname[$i] =~ s/\\/\//g;
  $spos=0;
  while(index($nname[$i],"\/",$spos) > 0){
    $ndir=substr($nname[$i],0,index($nname[$i],"\/",$spos));
    $spos=index($nname[$i],"\/",$spos)+1;
    unless(-d $ndir){
     mkdir($ndir);
    }
  }

  printf "$nname[$i]\n";
  open(OUT, "> $nname[$i]");
  binmode(OUT);
  print OUT $buf;
  close(OUT);
}

close(IN);