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LibPDF: Add name -> char code conversion in Encoding

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This is an operation that was already being done (sub-optimally) in
PS1FontProgram, so we are replacing that. We will use this during CFF
parsing too.
This commit is contained in:
Rodrigo Tobar 2023-01-18 23:57:11 +08:00 committed by Andreas Kling
parent c592b889bf
commit 1ec4ad5eb6
Notes: sideshowbarker 2024-07-17 18:46:30 +09:00 
Author: https://github.com/rtobar
Commit: https://github.com/SerenityOS/serenity/commit/1ec4ad5eb6
Pull-request: https://github.com/SerenityOS/serenity/pull/17082
3 changed files with 11 additions and 2 deletions
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8
Userland/Libraries/LibPDF/Encoding.cpp
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@ -171,6 +171,14 @@ CharDescriptor const& Encoding::get_char_code_descriptor(u16 char_code) const
return const_cast<Encoding*>(this)->m_descriptors.ensure(char_code);
}
u16 Encoding::get_char_code(DeprecatedString const& name) const
{
auto code_iterator = m_name_mapping.find(name);
if (code_iterator != m_name_mapping.end())
return code_iterator->value;
return 0;
}
bool Encoding::should_map_to_bullet(u16 char_code) const
{
// PDF Annex D table D.2, note 3:

1
Userland/Libraries/LibPDF/Encoding.h
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@ -645,6 +645,7 @@ public:
HashMap<u16, CharDescriptor> const& descriptors() const { return m_descriptors; }
HashMap<DeprecatedString, u16> const& name_mapping() const { return m_name_mapping; }
u16 get_char_code(DeprecatedString const&) const;
CharDescriptor const& get_char_code_descriptor(u16 char_code) const;
bool should_map_to_bullet(u16 char_code) const;

4
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
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@ -92,8 +92,8 @@ PDFErrorOr<void> PS1FontProgram::parse_encrypted_portion(ByteBuffer const& buffe
if (rd == "-|" || rd == "RD") {
auto line = TRY(decrypt(reader.bytes().slice(reader.offset(), encrypted_size), m_encryption_key, m_lenIV));
reader.move_by(encrypted_size);
auto name_mapping = encoding()->name_mapping();
auto char_code = name_mapping.ensure(word.substring_view(1));
auto glyph_name = word.substring_view(1);
auto char_code = encoding()->get_char_code(glyph_name);
GlyphParserState state;
TRY(add_glyph(char_code, TRY(parse_glyph(line, subroutines, state, false))));
}