CFF further work. about font-validator HOT 5 OPEN

Discussion with Sairus Patel of Adobe on the opentype mailing list clarified that offSize in the header should be the maximum of all the other offSize embedded in the INDEX's.

I think that already covers the cases of offset's inside dictionaries, as dictionaries are part of the TopDICT INDEX ? Need to think a bit more and test that's actually the case.

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suggestion from @Pomax, 3 February, 2016 on the opentype list:

2. any string that _is_ 7-bit clean, but doesn't conform to the postscript
string format, should probably be flagged as "Illegal string format: not
PostScript-compliant" (or variation thereof)

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Copied from top-level readme:

Incomplete CFF checks:

val_CFF.cs I.CFF_I_NotValidated
val_head.cs: I._TEST_I_NotForCFF head_MinMaxValues
val_hhea.cs: I._TEST_I_NotForCFF hhea_MinMax
val_OS2.cs: I._TEST_I_NotForCFF OS/2_xAvgCharWidth

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Hello, @HinTak

I just want to notify you that I have some C# code
that trying to read CFF in the otf format.

(folder https://github.com/LayoutFarm/Typography/tree/dev/Typography.OpenFont/Tables.CFF)

It works but ** NOT** finish yet.

This may help you too.

:)

example: read CFF, parse CharStrings and render.

pic 1: glyph 4, Latin-Modern-Math-Regular.otf,

please see LayoutFarm/Typography#75

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