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#!/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[font]
complete_refs[font] = 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]}"
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
filename = File.expand_path(File.dirname(__FILE__)) + "/../spec/data/cairo-unicode.pdf"
extractor = ExtractFonts::Extractor.new
PDF::Reader.open(filename) do |reader|
page = reader.page(1)
extractor.page(page)
end
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