Address errors caused by attempting to read data when none exists #128
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- skip mapping 0xFFFF - include glyphs mapped to gid 0 (missing character) - check that the calculated offset to read a glyph exists in the file (can be caused by a bad subtable definition)
Before this change php-font-lib always read the number of contours for a glyph. If a glyph has no data the read information would be incorrect. This could lead to invalid parsing of the glyph since the data may not represent the actual glyph format (simple). In fact, the data could be from outside the glyf table entirely. If the glyph was positioned as the last byte in the font a read error would be thrown.
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There is a known bug in the font lib regarding loading fonts. Conflict all versions that are not fixed. refer to dompdf/php-font-lib#128
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