#!/usr/bin/perl
#
# lspartab
#
# Read, parse and list an MSDOS labeled disc partition table 
#
# Copyright 2007 Simtec Electronics
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use, copy,
# modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

$F = $ARGV[0] or die "Usage: lspartab <disc image>";

open PARTTAB, "<", $F;
binmode PARTTAB;

my @partstarts = (446,462,478,494);

$extended = 4;

sub scanparts {
   my $secoffset = shift;
   my $pnum = shift;
   my $isext = shift;
   $buffer = "                ";
   foreach $partstart (@partstarts) {
      seek(PARTTAB, (512 * $secoffset) + $partstart, 0);
      sysread PARTTAB, $buffer, 16;
      $pnum++;
      ($type, $b1, $b2, $b3, $sys, $e1, $e2, $e3, $start, $count) = unpack("CCCCCCCCLL", $buffer);
      if ($sys == 5 || $sys == 15 || $sys == 0x85) {
         if ($secoffset == 0) {
            scanparts($isext+$start, $extended, $secoffset+$start);
         } else {
            scanparts($isext+$start, $extended, $isext);
         }
      }
      $extended++ if $isext;
      if( $count == 0 ) { $pnum++; next; }
      print $pnum," ", $secoffset+$start, " ", $count, " ", $sys, "\n";
   }
   return $pnum;
}

scanparts(0,0,0);

close PARTTAB;