Class: Origami::XRefStream

Inherits:
Stream
  • Object
show all
Includes:
Enumerable, StandardObject
Defined in:
lib/origami/xreftable.rb

Overview

Class representing a XRef Stream.

Constant Summary collapse

XREF_FREE = 
0
XREF_USED = 
1
XREF_COMPRESSED = 
2

Constants included from StandardObject

StandardObject::DEFAULT_ATTRIBUTES

Constants inherited from Stream

Stream::TOKENS

Constants included from Object

Object::TOKENS

Instance Attribute Summary

Attributes inherited from Stream

#dictionary

Attributes included from Object

#file_offset, #generation, #no, #objstm_offset, #parent

Instance Method Summary collapse

Methods included from StandardObject

included, #version_required

Methods inherited from Stream

#[], #[]=, add_type_signature, #cast_to, #data, #data=, #decode!, #each_filter, #each_key, #encode!, #encoded_data, #encoded_data=, #filters, guess_type, #key?, parse, #post_build, #set_predictor, #to_obfuscated_str, #to_s, #value

Methods included from FieldAccessor

#method_missing, #respond_to_missing?

Methods included from Object

#<=>, #cast_to, #copy, #document, #export, included, #indirect?, #indirect_parent, #logicalize, #logicalize!, #native_type, parse, #post_build, #reference, #set_document, #set_indirect, skip_until_next_obj, #solve, #to_o, #to_s, #type, typeof, #version_required, #xrefs

Constructor Details

#initialize(data = "", dictionary = {}) ⇒ XRefStream

Returns a new instance of XRefStream.



387
388
389
390
391
 
# File 'lib/origami/xreftable.rb', line 387

def initialize(data = "", dictionary = {})
    super(data, dictionary)

    @xrefs = nil
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Origami::FieldAccessor

Instance Method Details

#<<(xref) ⇒ Object

Adds an XRef to this Stream.



416
417
418
419
420
 
# File 'lib/origami/xreftable.rb', line 416

def <<(xref)
    load! if @xrefs.nil?

    @xrefs << xref
end

#clear ⇒ Object 



471
472
473
474
475
 
# File 'lib/origami/xreftable.rb', line 471

def clear
    self.data = ''
    @xrefs = []
    self.Index = []
end

#each(&b) ⇒ Object

Iterates over each XRef present in the stream.



425
426
427
428
429
 
# File 'lib/origami/xreftable.rb', line 425

def each(&b)
    load! if @xrefs.nil?

    @xrefs.each(&b)
end

#each_with_number ⇒ Object

Iterates over each XRef present in the stream, passing the XRef and its object number.



434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
 
# File 'lib/origami/xreftable.rb', line 434

def each_with_number
    return enum_for(__method__) unless block_given?

    load! if @xrefs.nil?

    ranges = object_ranges
    xrefs = @xrefs.to_enum

    ranges.each do |range|
        range.each do |no|
            begin
                yield(xrefs.next, no)
            rescue StopIteration
                raise InvalidXRefStreamObjectError, "Range is bigger than number of entries"
            end
        end
    end
end

#entries ⇒ Object 



393
394
395
396
397
 
# File 'lib/origami/xreftable.rb', line 393

def entries
    load! if @xrefs.nil?

    @xrefs
end

#find(no) ⇒ Object

Returns an XRef matching this object number.



456
457
458
459
460
461
462
463
464
465
466
467
468
469
 
# File 'lib/origami/xreftable.rb', line 456

def find(no)
    load! if @xrefs.nil?

    ranges = object_ranges

    index = 0
    ranges.each do |range|
        return @xrefs[index + no - range.begin] if range.cover?(no)

        index += range.size
    end

    nil
end

#pre_build ⇒ Object

Returns XRef entries present in this stream.



402
403
404
405
406
407
408
409
410
411
 
# File 'lib/origami/xreftable.rb', line 402

def pre_build #:nodoc:
    load! if @xrefs.nil?

    self.W = [ 1, 2, 2 ] unless self.key?(:W)
    self.Size = @xrefs.length + 1

    save!

    super
end