That is a nice approach.

I was in a hurry, so went for a quick substr approach:

push @a, [ unpack "CCSS", substr($data, $_ * 6, 6) ]
    for 0..(length($data) / 6 - 1);
[download]

Had an off-by-one error at first though. Perl doesn't seem to have a range operator that goes up to n-1, like Ruby does? (0..5 loops from 0 to 5 but 0...5 loops from 0 to 4 in Ruby)