Class: Origami::XRef
- Inherits:
-
Object
- Object
- Origami::XRef
- Defined in:
- lib/origami/xreftable.rb
Overview
Class representing a Cross-reference information.
Defined Under Namespace
Classes: InvalidXRefSectionError, InvalidXRefSubsectionError, Section, Subsection
Constant Summary collapse
- FREE =
"f"
- USED =
"n"
- FIRSTFREE =
65535
- @@regexp =
/(?<offset>\d{10}) (?<gen>\d{5}) (?<state>n|f)(\r\n| \r| \n)/
Instance Attribute Summary collapse
-
#generation ⇒ Object
Returns the value of attribute generation.
-
#offset ⇒ Object
Returns the value of attribute offset.
-
#state ⇒ Object
Returns the value of attribute state.
Class Method Summary collapse
-
.parse(stream) ⇒ Object
:nodoc:.
Instance Method Summary collapse
-
#free? ⇒ Boolean
Returns true if the associated object is freed.
-
#initialize(offset, generation, state) ⇒ XRef
constructor
Creates a new XRef.
-
#to_s ⇒ Object
Outputs self into PDF code.
- #to_xrefstm_data(type_w, field1_w, field2_w) ⇒ Object
-
#used? ⇒ Boolean
Returns true if the associated object is used.
Constructor Details
#initialize(offset, generation, state) ⇒ XRef
Creates a new XRef.
- offset
-
The file offset of the referenced Object.
- generation
-
The generation number of the referenced Object.
- state
-
The state of the referenced Object (FREE or USED).
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# File 'lib/origami/xreftable.rb', line 66 def initialize(offset, generation, state) @offset, @generation, @state = offset, generation, state end |
Instance Attribute Details
#generation ⇒ Object
Returns the value of attribute generation.
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# File 'lib/origami/xreftable.rb', line 58 def generation @generation end |
#offset ⇒ Object
Returns the value of attribute offset.
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# File 'lib/origami/xreftable.rb', line 58 def offset @offset end |
#state ⇒ Object
Returns the value of attribute state.
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# File 'lib/origami/xreftable.rb', line 58 def state @state end |
Class Method Details
.parse(stream) ⇒ Object
:nodoc:
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# File 'lib/origami/xreftable.rb', line 70 def self.parse(stream) #:nodoc: if stream.scan(@@regexp).nil? raise InvalidXRefError, "Invalid XRef format" end offset = stream['offset'].to_i generation = stream['gen'].to_i state = stream['state'] XRef.new(offset, generation, state) end |
Instance Method Details
#free? ⇒ Boolean
Returns true if the associated object is freed.
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# File 'lib/origami/xreftable.rb', line 92 def free? @state == FREE end |
#to_s ⇒ Object
Outputs self into PDF code.
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# File 'lib/origami/xreftable.rb', line 99 def to_s off = @offset.to_s.rjust(10, '0') gen = @generation.to_s.rjust(5, '0') "#{off} #{gen} #{@state}" + EOL end |
#to_xrefstm_data(type_w, field1_w, field2_w) ⇒ Object
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# File 'lib/origami/xreftable.rb', line 106 def to_xrefstm_data(type_w, field1_w, field2_w) type_w <<= 3 field1_w <<= 3 field2_w <<= 3 type = ((@state == FREE) ? "\000" : "\001").unpack("B#{type_w}")[0] offset = @offset.to_s(2).rjust(field1_w, '0') generation = @generation.to_s(2).rjust(field2_w, '0') [ type , offset, generation ].pack("B#{type_w}B#{field1_w}B#{field2_w}") end |