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LibPDF/CFF: Store if a font program is CID-keyed

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...and reject CID-keyed font programs for Type1 fonts.
This commit is contained in:
Nico Weber 2024-02-14 09:06:52 -05:00 • committed by Andreas Kling
parent bb7d29d007
commit 7494f24430
4 changed files with 26 additions and 0 deletions
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11
Userland/Libraries/LibPDF/Fonts/CFF.cpp
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@ -126,6 +126,11 @@ PDFErrorOr<NonnullRefPtr<CFF>> CFF::create(ReadonlyBytes const& cff_bytes, RefPt
return error("CFFs with more than one font not yet implemented");
auto const& top_dict = top_dicts[0];
if (top_dict.is_cid_keyed) {
// CFF spec, "18 CID-keyed Fonts"
cff->set_kind(CFF::Kind::CIDKeyed);
}
auto strings = TRY(parse_strings(reader));
// CFF spec "16 Local/Global Subrs INDEXes"
@ -350,6 +355,12 @@ PDFErrorOr<Vector<CFF::TopDict>> CFF::parse_top_dicts(Reader& reader, ReadonlyBy
}));
break;
}
case TopDictOperator::RegistryOrderingSupplement:
// CFF Spec, "18 CID-keyed Fonts"
// "The Top DICT begins with ROS operator which specifies the Registry-Ordering-Supplement for the font.
// This will indicate to a CFF parser that special CID processing should be applied to this font."
top_dict.is_cid_keyed = true;
break;
case TopDictOperator::FDSelect:
if (!operands.is_empty())
top_dict.fdselect_offset = operands[0].get<int>();