#hypothetical module 
 use Binary::Parser;

 $compiled_template = Binary::Parser->new( template => 'nCC C/a');
 my @result = $compiled_template->unpack($binary_data);
 
 # would be nice to have, like regex ? (0 or one)  at the end
 # it will match  C C/a 
 #                C C/a B8
 #                C C/a B8 f ...
 $optional_template = Binary::Parser->new( template => 'C C/a (B8 ff cc)?');