Sha256: 7fa3031214ce7cd31263507ac4dfecfb01f21fab8a2ac4b4b3a553c69e96bb7d
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Size: 1.93 KB
Versions: 19
Compression:
Stored size: 1.93 KB
Contents
class Prawn::SVG::TTF
SFNT_VERSION_STRINGS = ["\x00\x01\x00\x00", "true", "typ1"]
LANGUAGE_IDS = [0, 0x409] # English, US English
UTF_16BE_PLATFORM_IDS = [0, 3] # Unicode, Microsoft
attr_reader :family, :subfamily
def initialize(filename)
load_data_from_file(filename)
end
private
def load_data_from_file(filename)
File.open(filename, "rb") do |f|
offset_table = f.read(12)
return unless offset_table && offset_table.length == 12 && SFNT_VERSION_STRINGS.include?(offset_table[0..3])
table_count = offset_table[4].ord * 256 + offset_table[5].ord
tables = f.read(table_count * 16)
return unless tables && tables.length == table_count * 16
offset, length = table_count.times do |index|
start = index * 16
if tables[start..start+3] == 'name'
break tables[start+8..start+15].unpack("NNN")
end
end
return unless length
f.seek(offset)
data = f.read(length)
return unless data && data.length == length
format, name_count, string_offset = data[0..5].unpack("nnn")
names = {}
name_count.times do |index|
start = 6 + index * 12
platform_id, platform_specific_id, language_id, name_id, length, offset = data[start..start+11].unpack("nnnnnn")
next unless offset
next unless LANGUAGE_IDS.include?(language_id)
next unless [1, 2, 16, 17].include?(name_id)
offset += string_offset
field = data[offset..offset+length-1]
next unless field && field.length == length
names[name_id] = if UTF_16BE_PLATFORM_IDS.include?(platform_id)
field.force_encoding(Encoding::UTF_16BE).encode(Encoding::UTF_8) rescue field
else
field
end
end
@family = names[16] || names[1]
@subfamily = names[17] || names[2]
end
rescue Errno::ENOENT # in case the file disappears between the scan and the load, we don't want to crash
end
end
Version data entries
19 entries across 19 versions & 1 rubygems