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LibPDF: Convert CFF::parse_charset to Stream

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No behavior change.
This commit is contained in:
Nico Weber 2024-04-13 21:52:08 -04:00 • committed by Andreas Kling
commit 1f7924e14c
Notes: sideshowbarker 2024-07-16 18:03:21 +09:00
2 changed files with 10 additions and 10 deletions
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18
Userland/Libraries/LibPDF/Fonts/CFF.cpp
View file

@ -185,7 +185,7 @@ PDFErrorOr<NonnullRefPtr<CFF>> CFF::create(ReadonlyBytes const& cff_bytes, RefPt
Vector<SID> charset; // Maps GID to CIDs for CID-keyed, to SIDs otherwise.
Vector<DeprecatedFlyString> charset_names; // Only valid for non-CID-keyed fonts.
if (top_dict.is_cid_keyed) {
charset = TRY(parse_charset(Reader { cff_bytes.slice(top_dict.charset_offset) }, glyphs.size()));
charset = TRY(parse_charset(FixedMemoryStream { cff_bytes.slice(top_dict.charset_offset) }, glyphs.size()));
} else {
switch (top_dict.charset_offset) {
case 0:
@ -205,7 +205,7 @@ PDFErrorOr<NonnullRefPtr<CFF>> CFF::create(ReadonlyBytes const& cff_bytes, RefPt
TRY(charset_names.try_append(resolve_sid(sid, strings)));
break;
default: {
charset = TRY(parse_charset(Reader { cff_bytes.slice(top_dict.charset_offset) }, glyphs.size()));
charset = TRY(parse_charset(FixedMemoryStream { cff_bytes.slice(top_dict.charset_offset) }, glyphs.size()));
for (SID sid : charset)
TRY(charset_names.try_append(resolve_sid(sid, strings)));
break;
@ -854,18 +854,18 @@ DeprecatedFlyString CFF::resolve_sid(SID sid, Vector<StringView> const& strings)
return DeprecatedFlyString("space");
}
PDFErrorOr<Vector<CFF::SID>> CFF::parse_charset(Reader&& reader, size_t glyph_count)
PDFErrorOr<Vector<CFF::SID>> CFF::parse_charset(Stream&& reader, size_t glyph_count)
{
// CFF spec, "13 Charsets"
// Maps `GID - 1` to a SID (or CID, for CID-keyed fonts). The name of GID 0 is implicitly ".notdef".
Vector<SID> names;
auto format = TRY(reader.try_read<Card8>());
auto format = TRY(reader.read_value<Card8>());
if (format == 0) {
// CFF spec, "Table 17 Format 0"
dbgln_if(CFF_DEBUG, "CFF charset format 0");
for (size_t i = 0; i < glyph_count - 1; i++) {
SID sid = TRY(reader.try_read<BigEndian<SID>>());
SID sid = TRY(reader.read_value<BigEndian<SID>>());
TRY(names.try_append(sid));
}
} else if (format == 1) {
@ -873,8 +873,8 @@ PDFErrorOr<Vector<CFF::SID>> CFF::parse_charset(Reader&& reader, size_t glyph_co
dbgln_if(CFF_DEBUG, "CFF charset format 1");
while (names.size() < glyph_count - 1) {
// CFF spec, "Table 19 Range1 Format (Charset)"
auto first_sid = TRY(reader.try_read<BigEndian<SID>>());
int left = TRY(reader.try_read<Card8>());
auto first_sid = TRY(reader.read_value<BigEndian<SID>>());
int left = TRY(reader.read_value<Card8>());
for (SID sid = first_sid; left >= 0; left--, sid++)
TRY(names.try_append(sid));
}
@ -884,8 +884,8 @@ PDFErrorOr<Vector<CFF::SID>> CFF::parse_charset(Reader&& reader, size_t glyph_co
dbgln_if(CFF_DEBUG, "CFF charset format 2");
while (names.size() < glyph_count - 1) {
// CFF spec, "Table 21 Range2 Format"
auto first_sid = TRY(reader.try_read<BigEndian<SID>>());
int left = TRY(reader.try_read<BigEndian<Card16>>());
auto first_sid = TRY(reader.read_value<BigEndian<SID>>());
int left = TRY(reader.read_value<BigEndian<Card16>>());
for (SID sid = first_sid; left >= 0; left--, sid++)
TRY(names.try_append(sid));
}

2
Userland/Libraries/LibPDF/Fonts/CFF.h
View file

@ -136,7 +136,7 @@ public:
static PDFErrorOr<Vector<CFF::Glyph>> parse_charstrings(Reader&&, Vector<ByteBuffer> const& local_subroutines, Vector<ByteBuffer> const& global_subroutines);
static DeprecatedFlyString resolve_sid(SID, Vector<StringView> const&);
static PDFErrorOr<Vector<SID>> parse_charset(Reader&&, size_t);
static PDFErrorOr<Vector<SID>> parse_charset(Stream&&, size_t);
static PDFErrorOr<Vector<u8>> parse_fdselect(Stream&&, size_t);
static PDFErrorOr<Vector<u8>> parse_encoding(Stream&&, HashMap<Card8, SID>& supplemental);
};