Timur Kamalov created PDFBOX-3093:
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Summary: Exception in TTFParser
Key: PDFBOX-3093
URL: https://issues.apache.org/jira/browse/PDFBOX-3093
Project: PDFBox
Issue Type: Bug
Reporter: Timur Kamalov
Attachments: Skipping_font_tables_with_zero_length_.patch, resfont.ttf
The reason for this is an ambiguity in the TrueType specification. Namely, one
of the font tables (OS/2) is present in the font directory with length 0. The
specification itself is completely silent about this.
The only other information I was able to find is:
- the FreeType font library
(http://www.freetype.org/freetype2/docs/reference/ft2-truetype_tables.html#FT_Sfnt_Table_Info)
assumes that any table having 0 length in the font directory is treated as
missing.
- Google OpenType Sanitizer would report an error in such situation:
https://github.com/khaledhosny/ots/blob/master/src/ots.cc, lines 575-578
- there are several related discussions at Adobe forums:
https://forums.adobe.com/thread/1616317 ,
https://forums.adobe.com/thread/1611899
As allowing zero length tables in TrueType fonts seems to be quite logical
(and also implicitly confirmed by Adobe Acrobat validator), I've changed the
TTFParser to skip tables with 0 length.
Attaching patch and font file. Will add test file also if necessary.
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