Marcus: could you specify the speed loss? If it's noticeable I would
rather suggest to either introduce a new function or another parameter
to getimagesize(), no matter what the default is (e.g. let
getimagesize() get the "real" size and introduce something like
getimagesize_fast()) or the other way around.
Not before seeing the solution...
I once thought about it, too. But i skipped the idea because i guessed
i had to decompress the first block. At the time i was thinking about it
we had the philosophy to exclude all patend related code...
marcus