[fontloader] crash in font-otf.lua / actions["reorganize glyph anchors"]

[fontloader] crash in font-otf.lua / actions["reorganize glyph anchors"]

[Philipp Gesang]

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Hi Hans,

this bug was reported a while ago by user Thérèse on
tex.stackexchange.com [1]. The font “Eadui.ttf” [2] causes the
fontloader to access a nil value because the “Anchor-1” table is
sparse (nil at index 3). Test file for Context:

    https://bitbucket.org/phg/lua-la-tex-tests/src/tip/cnt-eadui.tex

Patch attached, though I suspect it covers only the symptoms.

Philipp

[1] http://tex.stackexchange.com/q/195481/14066
[2] Download at http://openfontlibrary.org/font/eadui


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diff --git a/tex/context/base/font-otf.lua b/tex/context/base/font-otf.lua
index 302d8ea..de392a9 100644
--- a/tex/context/base/font-otf.lua
+++ b/tex/context/base/font-otf.lua
@@ -2010,7 +2010,11 @@ actions["reorganize glyph anchors"] = function(data,filename,raw) -- when we rep
                     for tag, specification in next, data do
                         for i=1,#specification do
                             local si = specification[i]
-                            specification[i] = { si.x or 0, si.y or 0 }
+                            if si then
+                              specification[i] = { si.x or 0, si.y or 0 }
+                            else
+                              specification[i] = {  }
+                            end
                         end
                     end
                 else

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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: [fontloader] crash in font-otf.lua / actions["reorganize glyph anchors"]

[Philipp Gesang]

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···<date: 2014-12-14, Sunday>···<from: Philipp Gesang>···

> this bug was reported a while ago by user Thérèse on
> tex.stackexchange.com [1]. The font “Eadui.ttf” [2] causes the
> fontloader to access a nil value because the “Anchor-1” table is
> sparse (nil at index 3). Test file for Context:
> 
>     https://bitbucket.org/phg/lua-la-tex-tests/src/tip/cnt-eadui.tex
> 
> Patch attached, though I suspect it covers only the symptoms.

Thanks for fixing!

Philipp


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________