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Old 08-17-2006, 09:29 PM   #8
iamback's Avatar
Join Date: Oct 2005
Location: Amsterdam, NL
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Originally Posted by Michael Rowley View Post
Yes, of course there is, but you will have to go to the Open Type Specification for that.
Found it (links in my reply to KT). The Organization of an OpenType Font section says:
OpenType fonts that contain TrueType outlines should use the value of 1.0 for the sfnt version. OpenType fonts containing CFF data should use the tag 'OTTO' as the sfnt version number.
NOTE: The Apple specification for TrueType fonts allows for 'true' and 'typ1' for sfnt version. These version tags should not be used for fonts which contain OpenType tables.
So... if I go looking first for files with an .OTF extension, and within that set for files which contain the string 'OTTO' then whatever is is not matched by the sub-search must be files with TrueType outlines (given I do not have Mac fonts - at least no working ones!). No hex viewer needed even, just plain Search can do that.

Result on my machine: 17 files with an ".otf" extension (lower case), 13 of which originating from Adobe; all 17 contain the string "OTTO".

Looking with a hex viewer at one of them, the string "OTTO" is right at the start of the file, so finding that (or another sfnt version) is simply a matter of looking at the first 4 bytes (provided the file contains only one font - but if it has multiple fonts it should have a TTC extension, not OTF).

Marjolein Katsma
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