Class: PDF::Reader::Stream

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/stream.rb

Overview

An internal PDF::Reader class that represents a stream object from a PDF. Stream objects have 2 components, a dictionary that describes the content (size, compression, etc) and a stream of bytes.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash, data) ⇒ Stream

Creates a new stream with the specified dictionary and data. The dictionary should be a standard ruby hash, the data should be a standard ruby string.



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# File 'lib/pdf/reader/stream.rb', line 40

def initialize (hash, data)
  @hash = hash
  @data = data
  @udata = nil
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/pdf/reader/stream.rb', line 35

def data
  @data
end

#hash ⇒ Object

Returns the value of attribute hash.



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# File 'lib/pdf/reader/stream.rb', line 35

def hash
  @hash
end

Instance Method Details

#unfiltered_data ⇒ Object

apply this streams filters to its data and return the result.



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# File 'lib/pdf/reader/stream.rb', line 47

def unfiltered_data
  return @udata if @udata
  @udata = data.dup

  if hash.has_key?(:Filter)
    options = []

    if hash.has_key?(:DecodeParms)
      if hash[:DecodeParms].is_a?(Hash)
        options = [hash[:DecodeParms]]
      else
        options = hash[:DecodeParms]
      end
    end

    Array(hash[:Filter]).each_with_index do |filter, index|
      @udata = Filter.with(filter, options[index]).filter(@udata)
    end
  end
  @udata
end