1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
#!/usr/bin/env ruby
# coding: utf-8
# This demonstrates a way to extract TTF fonts from a PDF. It could be expanded
# to support extra font formats if required. Be aware that many PDFs subset
# fonts before they're embedded so glyphs may be missing or re-arranged.
require 'pdf/reader'
module ExtractFonts
class Extractor
def page(page)
count = 0
return count if page.fonts.nil? || page.fonts.empty?
page.fonts.each do |label, font|
next if complete_refs[label]
complete_refs[label] = true
process_font(page, font)
count += 1
end
count
end
private
def process_font(page, font)
font = page.objects.deref(font)
case font[:Subtype]
when :Type0 then
font[:DescendantFonts].each { |f| process_font(page, f) }
when :TrueType, :CIDFontType2 then
ExtractFonts::TTF.new(page.objects, font).save("#{font[:BaseFont]}.ttf")
else
$stderr.puts "unsupported font type #{font[:Subtype]} for #{font[:BaseFont]}"
end
end
def complete_refs
@complete_refs ||= {}
end
end
class TTF
def initialize(objects, font)
@objects, @font = objects, font
@descriptor = @objects.deref(@font[:FontDescriptor])
end
def save(filename)
puts "#{filename}"
if @descriptor && @descriptor[:FontFile2]
stream = @objects.deref(@descriptor[:FontFile2])
File.open(filename, "wb") { |file| file.write stream.unfiltered_data }
else
$stderr.puts "- TTF font not embedded"
end
end
end
end
if ARGV.size == 0 # default file name
ARGV << File.expand_path(File.join(File.dirname(__dir__), "spec", "data", "cairo-unicode.pdf"))
end
extractor = ExtractFonts::Extractor.new
ARGV.each do |arg|
PDF::Reader.open(arg) do |reader|
page = reader.page(1)
extractor.page(page)
end
end
|
