[gs-bugs] [Bug 689516] problem reading PDF: Failed to interpret TT instructions (ref 7814)

[bugs.ghostscript.com-bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=689516





------- Additional Comments From leonardo at artifex.com  2008-05-24 07:06 -------
The test document embeds a TT font, in which  numGlyphs=5 and loca length = 
28. This may be obtained when running  with -ZY. The failed condition is 
gstype42.c ln 518 : 

 if (glyph_index >= pfont->data.trueNumGlyphs)
 	return_error(gs_error_invalidfont);

So I've got an idea how to work around : when loading a font. check if 
numGlyphs is smaller than locaa length. If so< chech whether all loca entries 
are correct. If so, fix numGlyphs and print warning.

I'm not sure that it will work fine, but chances look pretty good. So at this 
point we can talk to the customer that the document is incorrect, and we're 
trying to develop a workaround.



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