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So, I'm not entirely sure if this is how it's supposed to be resolved. I was using
ttf-parser
as a fuzzer for my subsetter, and realized thatparse_charset
has this check to returnNone
when there is only one glyph (i.e. the .notdef glyph) in the font. This means that it will fail to parse the cff table in that case. However, I would argue that a font with just the .notdef glyph should be perfectly fine in theory (even though in practice this obviously doesn't make a lot of sense), because the.notdef
glyph can have outlines as well.