class TTFunk::Table::Cff::Encoding

def code_for(glyph_id)
  return 0 if glyph_id.zero?
  # rather than validating the glyph as part of one of the predefined
  # encodings, just pass it through
  return glyph_id unless offset
  case format_sym
  when :array_format, :supplemental
    @entries[glyph_id]
  when :range_format
    remaining = glyph_id
    @entries.each do |range|
      if range.size >= remaining
        return (range.first + remaining) - 1
      end
      remaining -= range.size
    end
    0
  end
end