Class: Pdfrb::XrefSection

Inherits:
Object
  • Object
show all
Defined in:
lib/pdfrb/xref_section.rb

Overview

In-memory cross-reference section (s7.5.4). Maps oid -> Entry where each Entry is one of:

* :in_use   — at +offset+ in the file, generation +gen+.
* :free     — head of free list (with next-free oid +gen+).
* :compressed — inside ObjStm +obj_stm_oid+ at index +index+.

Defined Under Namespace

Classes: Entry

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(size: 0) ⇒ XrefSection

Returns a new instance of XrefSection.



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# File 'lib/pdfrb/xref_section.rb', line 18

def initialize(size: 0)
  @entries = {}
  @size = size
end

Instance Attribute Details

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/pdfrb/xref_section.rb', line 16

def entries
  @entries
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/pdfrb/xref_section.rb', line 16

def size
  @size
end

Instance Method Details

#[](oid) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 37

def [](oid)
  @entries[oid]
end

#add_compressed(oid, obj_stm_oid, index) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 32

def add_compressed(oid, obj_stm_oid, index)
  @entries[oid] = Entry.new(type: :compressed, obj_stm_oid: obj_stm_oid, index: index)
  @size = [@size, oid + 1].max
end

#add_free(oid, gen, next_free) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 28

def add_free(oid, gen, next_free)
  @entries[oid] = Entry.new(type: :free, offset: next_free, gen: gen)
end

#add_in_use(oid, gen, offset) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 23

def add_in_use(oid, gen, offset)
  @entries[oid] = Entry.new(type: :in_use, offset: offset, gen: gen)
  @size = [@size, oid + 1].max
end

#each_entry(&block) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 41

def each_entry(&block)
  @entries.each(&block)
end

#merge!(other) ⇒ Object 



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# File 'lib/pdfrb/xref_section.rb', line 45

def merge!(other)
  other.entries.each { |oid, e| @entries[oid] = e unless @entries.key?(oid) }
  @size = [@size, other.size].max
  self
end