-sub template {
- my ($self, $format) = @_;
- # total (flattened) unpack template from nested format definitions
- return join '', map {
- my $value = $format->[-($_ << 1) - 1];
- if (ref $value eq 'ARRAY') {
- my $count = $value->[0];
- $value = $self->template($value);
- $value = $count =~ s/^([*\d]+)// ? "$count($value)$1"
- : $count."X[$count]$count/($value)";
- }
- else {
- $value =~ s/^C(a)(\d+)/$1 . ($2 + 1)/e; # length prefix
+ $data->{levels} = [];
+ for my $modes (@VARMODES) {
+ my $variant = shift @$modes;
+ my @modeoffsets = grep {defined} #TODO: comment
+ map { $data->{moderef}->{offset}->{$_} } @$modes;
+ @modeoffsets or next;
+ $data->{levelcount}->{$variant} = 0;
+ $offset = min(grep {$_} @modeoffsets) or next;
+ $offset -= $offsetbase;
+ my $amount = $variant eq 'single' ? 100
+ : max(grep {defined} map { $data->{moderef}->{end}->{$_} } @$modes);
+
+ my @varform = @LEVELFORM;
+ $varform[13]->[0] = $variant ~~ ['single', 'peaworm'] ? 1 : 4; # worms
+ unshift @varform, name => 'Z*' unless $variant eq 'single' or $version <= 91;
+ $varform[-3]->[0] = 1 if $variant eq 'race' and $version > 91;
+ $varform[-3]->[0] = 2 if $variant eq 'ctf';
+ push @varform, size => '=.';
+ my $parselevel = Parse::Binary::Nested->new(\@varform);
+
+ while ($offset < length $data->{leveldata}) {
+ last if substr($data->{leveldata}, $offset, 1) eq chr(255);
+
+ # find references to this level offset, and set start number to matching modes
+ while (my ($mode, $location) = each %{ $data->{moderef}->{offset} }) {
+ $location == $offset + $offsetbase or next;
+ $data->{moderef}->{start}->{$mode} = 1 + scalar @{ $data->{levels} };
+ }
+
+ my $level = $parselevel->unpackf(substr $data->{leveldata}, $offset);
+ $level->{offset} = $offset + $offsetbase;
+
+ # add objects until terminator
+ $level->{objects} = [];
+ if ($version <= 91) {
+ ref $_ eq 'ARRAY' and push @{ $level->{objects} }, @$_
+ for map { delete $level->{"objects$_"} } 2, 3;