[JW Lua] Opening a .suit font file on MacOS doesn't work, ttf and otf works

[Jan Angermüller]

Jari et al,

I am finally converting my Perfect Layout plug-in to MacOS
(here a first preview: https://www.youtube.com/watch?v=vFUpFmfAGMk ).

The plug-in includes a tool for reading fonts and their metrics.
Unfortunately there seems to be a weird problem with .suit font files on 
MacOS.
They seem to be not readable through io.open.
.ttf and .otf works fine, but opening .suit simply returns an empty string.

Any ideas on this? I don't have much MacOS insider experience, so any 
help is appreciated.
Does it have to do with how MacOS handles some resources that are 
actually containers/wrappers for other files?

Here is my test code:

|localinput 
=assert(io.open("/Library/Fonts/Tahoma.ttf","rb"))localdata=input:read("*all")print(string.byte(data,1))--prints 
the correct value 0io.close(input)localinput 
=assert(io.open("/Library/Fonts/Maestro.suit","rb"))localdata=input:read("*all")print(string.byte(data,1))--prints 
nothing, but value 0 would have been expected io.close(input)|


When I extract the Maestro.ttf font that is included in Maestro.suit and 
run the code directly on Maestro.ttf, it also works fine.

Jan

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