Class: Ciphr::Functions::Radix::Radix

Inherits:
InvertibleFunction show all
Defined in:
lib/ciphr/functions/base_radix.rb

Instance Attribute Summary

Attributes inherited from InvertibleFunction

#invert

Attributes inherited from Function

#args, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from InvertibleFunction

invertable?

Methods inherited from Function

inherited, #initialize, invertable?, #prepend, #read

Constructor Details

This class inherits a constructor from Ciphr::Functions::Function

Class Method Details

.aligned ⇒ Object 



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# File 'lib/ciphr/functions/base_radix.rb', line 161

def self.aligned
  :right
end

.params ⇒ Object 



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# File 'lib/ciphr/functions/base_radix.rb', line 169

def self.params
  [:input]
end

.variants ⇒ Object 



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# File 'lib/ciphr/functions/base_radix.rb', line 165

def self.variants
  (2..36).map{|r| [["r#{r}","rad#{r}","radix#{r}"], {:radix => r}]}
end

Instance Method Details

#apply ⇒ Object 



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# File 'lib/ciphr/functions/base_radix.rb', line 173

def apply
  radix = options[:radix]
  input = @args[0]
  if !invert     
    num = 0      
    while chunk = input.read(1)
      num = (num << 8) + chunk.bytes.to_a[0]
    end
    Proc.new do
      begin
        num && num.to_s(radix)
      ensure
        num = nil
      end
    end
  else
    num = input.read().to_i(radix)
    bytes = []
    while num > 0
      bytes.unshift(num & 0xff)
      num = num >> 8
    end
    Proc.new do
      begin
        bytes && bytes.pack("c*")
      ensure
        bytes = nil
      end
    end
  end
end