[Dev-luatex] Bug for subsetted CFF font output

Marcel Krüger tex at 2krueger.de
Tue Oct 23 11:57:56 CEST 2018

 ---- On Tue, 23 Oct 2018 11:21:33 +0200 luigi scarso <luigi.scarso at gmail.com> wrote ---- 
 > On Tue, Oct 23, 2018 at 10:53 AM Marcel Krüger <tex at 2krueger.de> wrote:
 > Hi,
 >  another bug in LuaTeX: If LuaTeX tries to calculate the size of a CFF table where the second entry in the table is a real number,
 >  `pack_real` is called with `work_buffer+i` for a small `i`.
 >  This causes aliasing issues because `work_buffer` writes into `work_buffer` using `sprintf`.
 >  So the output from `pack_real` modifies `work_buffer` before the digits are read completely,
 >  causing LuaTeX to complain about a "invalid character".
 >  An example to reproduce the issue:
 >  Run the following plainTeX document with the attached version of `LOGO10.otf` (the font was created by reordering
 >  the Private table entries and has an invalid checksum, but this is ignored by LuaTeX)
 > hm, not sure about invalid checksum... can you try to fix it with ttx  ? (be careful, change the name of the new otf ie  CFFFont name etc) 
 > --luigi 

I already tried, but tty always stores the BlueValues first. I originally triggered this when I had a font which had fractional BlueValues which
are replaced by whole 
So fixing the checksum would need some other tool or manual calculation, but I do
not think it is worth it: LuaTeX does not care (I regularly use auto-generated fonts with all checksums set to zero
without problems)
Also there are no checksums in the actual CFF part, only in the OTF wrapper which is mostly ignored anyway.

Best regards

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