Class: Origami::PDF::LinearParser

Inherits:
Parser show all
Defined in:
lib/origami/parsers/pdf/linear.rb

Overview

Create a new PDF linear Parser.

Constant Summary

Constants inherited from Origami::Parser

Origami::Parser::VERBOSE_DEBUG, Origami::Parser::VERBOSE_INFO, Origami::Parser::VERBOSE_INSANE, Origami::Parser::VERBOSE_QUIET

Instance Attribute Summary

Attributes inherited from Origami::Parser

#options

Instance Method Summary collapse

Methods inherited from Parser

#initialize

Methods inherited from Origami::Parser

#defer_type_cast, #initialize, #parse_object, #parse_trailer, #parse_xreftable, #target_data, #target_filename, #target_filesize

Constructor Details

This class inherits a constructor from Origami::PDF::Parser

Instance Method Details

#parse(stream) ⇒ Object 



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# File 'lib/origami/parsers/pdf/linear.rb', line 34

def parse(stream)
  super
  
  pdf = parse_initialize

  #
  # Parse each revision
  #
  revision = 0
  until @data.eos? do
    
    begin
      pdf.add_new_revision unless revision.zero?
      revision = revision + 1

      info "...Parsing revision #{pdf.revisions.size}..."
      loop do
        break if (object = parse_object).nil?
        pdf.insert(object)
      end

      pdf.revisions.last.xreftable = parse_xreftable

      trailer = parse_trailer
      pdf.revisions.last.trailer = trailer

      xrefstm = pdf.get_object_by_offset(trailer.startxref) || 
        (pdf.get_object_by_offset(trailer.XRefStm) if trailer.has_field? :XRefStm)

      if not xrefstm.nil?
        warn "Found a XRefStream for this revision at #{xrefstm.reference}"
        pdf.revisions.last.xrefstm = xrefstm
      end

    rescue SystemExit
      raise
    rescue Exception => e
      error "Cannot read : " + (@data.peek(10) + "...").inspect
      error "Stopped on exception : " + e.message

      break
    end

  end

  parse_finalize(pdf)
end