() Lars Magne Ingebrigtsen <larsi@gnus.org>
() Mon, 12 Aug 2013 17:17:39 +0200

   Yes.  This will add to the general confusion in this area.

Another idea (that may or may not increase confusion) is to
use GNU libextractor:

 http://www.gnu.org/software/libextractor/

for image type (format) detection, and perhaps (w/ a SMOP) as an
additional "magic" for ‘magic-mode-alist’, something like:

 (EXTRACTOR-SPEC . FUNCTION)

where EXTRACTOR-SPEC is a non-string (otherwise it would be taken as
REGEXP) form that configures libextractor to DTRT.

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