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LibPDF: Make Subrs optional in PS1FontProgram

Browse Source 
https://adobe-type-tools.github.io/font-tech-notes/pdfs/T1_SPEC.pdf :

"Using charstring subroutines is not a requirement of a Type 1
font program."

And some versions of Computer Modern do in fact not contain a Subrs
array.

Together with #21473, makes Problemset.pdf from the pdffiles repro
render ok instead of crashing.
This commit is contained in:
Nico Weber 2023-10-17 15:54:42 -04:00 committed by Andreas Kling
parent 063e66cae9
commit f0e7fb7038
Notes: sideshowbarker 2024-07-16 23:52:10 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/f0e7fb7038
Pull-request: https://github.com/SerenityOS/serenity/pull/21480
1 changed files with 3 additions and 3 deletions
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6
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
View File

@ -70,9 +70,9 @@ PDFErrorOr<void> PS1FontProgram::parse_encrypted_portion(ByteBuffer const& buffe
if (seek_name(reader, "lenIV"))
m_lenIV = TRY(parse_int(reader));
if (!seek_name(reader, "Subrs"))
return error("Missing subroutine array");
auto subroutines = TRY(parse_subroutines(reader));
Vector<ByteBuffer> subroutines;
if (seek_name(reader, "Subrs"))
subroutines = TRY(parse_subroutines(reader));
if (!seek_name(reader, "CharStrings"))
return error("Missing char strings array");