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@blippy

blippy/pd.pl6

Created Nov 25, 2020
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Partition dump MBR
#!/usr/bin/env perl6
# Reference:
# https://wiki.osdev.org/Partition_Table
my %ids = 0x00 => "Empty", 0x0b => "W95 FAT32", 0x0c => "W95 FAT32 (LBA)",
0x82 => "Linux swap", 0x83 => "Linux", 0x93 => "Amoeba";
sub MAIN($filename) {
say "Disk: $filename";
say "NB: addesses given in (decimal) blocks of 512 bytes each";
say "Part Boot Start End Size Id Type";
my $fh = IO::Handle.new(:path($filename.IO.path)).open;
$fh.seek(0x01BE);
my $entry;
sub eat() { return $entry.shift; }
for 1..4 {
$entry = $fh.read(16);
my $boo = eat;
$boo = $boo == 0x80 ?? "*" !! " ";
for 1..3 { eat; }
my $sid = eat;
for 1..3 { eat; }
my $start = $entry.read-uint32(0, LittleEndian);
last if $start == 0;
my $size = $entry.read-uint32(4, LittleEndian);
my $end = $start + $size -1 ;
my $name = %ids{$sid} || "Unknown";
printf "%d %8.8s %8d %8d %8d 0x%.2X %s\n", $_, $boo, $start,$end, $size, $sid, $name;
}
$fh.close;
}
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