ROB: Prevent excessive layout mode text output from Type3 fonts

[shartzog]

Partially addresses #3081 by checking for a '/ToUnicode' map in Type3 font dictionaries. If no such map is present, check to see if the font is using standard Adobe glyph names. If not, mark the font as 'uninterpretable' and prevent collection of text content from any text operations associated with the font.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (049f71e) to head (eb2f5a4).
Report is 115 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3082      +/-   ##
==========================================
+ Coverage   96.48%   96.50%   +0.01%     
==========================================
  Files          52       52              
  Lines        8795     8807      +12     
  Branches     1608     1612       +4     
==========================================
+ Hits         8486     8499      +13     
+ Misses        184      183       -1     
  Partials      125      125              

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[stefan6419846]

Thanks for the report and looking into it.

I assume that you own the necessary rights for us to be able to distribute the test file as part of the source code?

[shartzog]

Good point. I'm not certain about the copyright details for the engine that created that document. The associated test is currently accessing it via its link in #3081 anyway, so there's no real reason to include it in the resources folder. Is the link in the issue an acceptable long term access option or should I make other arrangements (e.g. in samples)?

[stefan6419846]

Accessing using a link is perfectly fine for now. The alternative for specific files which fulfill CC-BY-SA-4.0 would be the https://github.com/py-pdf/sample-files repository, but we are currently not enforcing anything like this.