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LibPDF: Make CFF::parse_charset() return SIDs
...and do string expansion at the call site. CID-keyed fonts treat the charset as CIDs instead of as SIDs, so having access to the SIDs in numberic form will be useful when we implement support for CID-keyed CFF fonts. No behavior change.
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9750261921
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2 changed files with 11 additions and 8 deletions
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@ -267,10 +267,13 @@ PDFErrorOr<NonnullRefPtr<CFF>> CFF::create(ReadonlyBytes const& cff_bytes, RefPt
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for (SID sid : s_predefined_charset_expert_subset)
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TRY(charset_names.try_append(resolve_sid(sid, strings)));
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break;
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default:
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charset_names = TRY(parse_charset(Reader { cff_bytes.slice(charset_offset) }, glyphs.size(), strings));
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default: {
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auto charset = TRY(parse_charset(Reader { cff_bytes.slice(charset_offset) }, glyphs.size()));
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for (SID sid : charset)
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TRY(charset_names.try_append(resolve_sid(sid, strings)));
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break;
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}
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}
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// Adjust glyphs' widths as they are deltas from nominalWidthX
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for (auto& glyph : glyphs) {
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@ -734,17 +737,17 @@ DeprecatedFlyString CFF::resolve_sid(SID sid, Vector<StringView> const& strings)
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return DeprecatedFlyString("space");
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}
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PDFErrorOr<Vector<DeprecatedFlyString>> CFF::parse_charset(Reader&& reader, size_t glyph_count, Vector<StringView> const& strings)
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PDFErrorOr<Vector<CFF::SID>> CFF::parse_charset(Reader&& reader, size_t glyph_count)
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{
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// CFF spec, "13 Charsets"
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Vector<DeprecatedFlyString> names;
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Vector<SID> names;
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auto format = TRY(reader.try_read<Card8>());
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if (format == 0) {
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// CFF spec, "Table 17 Format 0"
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dbgln_if(CFF_DEBUG, "CFF charset format 0");
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for (size_t i = 0; i < glyph_count - 1; i++) {
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SID sid = TRY(reader.try_read<BigEndian<SID>>());
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TRY(names.try_append(resolve_sid(sid, strings)));
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TRY(names.try_append(sid));
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}
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} else if (format == 1) {
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// CFF spec, "Table 18 Format 1"
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@ -754,7 +757,7 @@ PDFErrorOr<Vector<DeprecatedFlyString>> CFF::parse_charset(Reader&& reader, size
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auto first_sid = TRY(reader.try_read<BigEndian<SID>>());
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int left = TRY(reader.try_read<Card8>());
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for (SID sid = first_sid; left >= 0 && names.size() < glyph_count - 1; left--, sid++)
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TRY(names.try_append(resolve_sid(sid, strings)));
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TRY(names.try_append(sid));
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}
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} else if (format == 2) {
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// CFF spec, "Table 20 Format 2"
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@ -765,7 +768,7 @@ PDFErrorOr<Vector<DeprecatedFlyString>> CFF::parse_charset(Reader&& reader, size
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auto first_sid = TRY(reader.try_read<BigEndian<SID>>());
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int left = TRY(reader.try_read<BigEndian<Card16>>());
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for (SID sid = first_sid; left >= 0 && names.size() < glyph_count - 1; left--, sid++)
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TRY(names.try_append(resolve_sid(sid, strings)));
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TRY(names.try_append(sid));
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}
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} else {
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dbgln("CFF: Unknown charset format {}", format);
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@ -97,7 +97,7 @@ public:
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static PDFErrorOr<Vector<CFF::Glyph>> parse_charstrings(Reader&&, Vector<ByteBuffer> const& local_subroutines, Vector<ByteBuffer> const& global_subroutines);
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static DeprecatedFlyString resolve_sid(SID, Vector<StringView> const&);
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static PDFErrorOr<Vector<DeprecatedFlyString>> parse_charset(Reader&&, size_t, Vector<StringView> const&);
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static PDFErrorOr<Vector<SID>> parse_charset(Reader&&, size_t);
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static PDFErrorOr<Vector<u8>> parse_encoding(Reader&&, HashMap<Card8, SID>& supplemental);
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};
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