Method: CombinePDF::PDF#to_pdf

Defined in:
lib/combine_pdf/pdf_public.rb

#to_pdf(options = {}) ⇒ Object

Formats the data to PDF formats and returns a binary string that represents the PDF file content.

This method is used by the save(file_name) method to save the content to a file.

use this to export the PDF file without saving to disk (such as sending through HTTP ect’).



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# File 'lib/combine_pdf/pdf_public.rb', line 176

def to_pdf(options = {})
  # reset version if not specified
  @version = 1.5 if @version.to_f == 0.0

  # set info for merged file
  unless(@info[:CreationDate].is_a?(String))
    @info[:CreationDate] = Time.now unless @info[:CreationDate].is_a?(Time)
    @info[:CreationDate] = @info[:CreationDate].getgm.strftime("D:%Y%m%d%H%M%S%:::z'00")
  end
  @info[:Subject] = options[:subject] if options[:subject]
  @info[:Producer] = options[:producer] if options[:producer]
  # rebuild_catalog
  catalog = rebuild_catalog_and_objects
  # add ID and generation numbers to objects
  renumber_object_ids

  out = []
  xref = []
  indirect_object_count = 1 # the first object is the null object
  # write head (version and binanry-code)
  out << "%PDF-#{@version}\n%\xFF\xFF\xFF\xFF\xFF\x00\x00\x00\x00".force_encoding(Encoding::ASCII_8BIT)

  # collect objects and set xref table locations
  loc = 0
  out.each { |line| loc += line.bytesize + 1 }
  @objects.each do |o|
    indirect_object_count += 1
    xref << loc
    out << object_to_pdf(o)
    loc += out.last.bytesize + 1
  end
  xref_location = loc
  # xref_location = 0
  # out.each { |line| xref_location += line.bytesize + 1}
  out << "xref\n0 #{indirect_object_count}\n0000000000 65535 f "
  xref.each { |offset| out << ("%010d 00000 n ".freeze % offset) }
  out << 'trailer'.freeze
  out << "<<\n/Root #{false || "#{catalog[:indirect_reference_id]} #{catalog[:indirect_generation_number]} R"}"
  out << "/Size #{indirect_object_count}"
  out << "/Info #{@info[:indirect_reference_id]} #{@info[:indirect_generation_number]} R"
  out << ">>\nstartxref\n#{xref_location}\n%%EOF"
  # when finished, remove the numbering system and keep only pointers
  remove_old_ids
  # output the pdf stream
  out.join("\n".b).force_encoding(Encoding::ASCII_8BIT)
end