Class: Ciphr::Functions::ZLib::Gzip

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

Defined Under Namespace

Classes: UncloseableIOProxy

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

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

Constructor Details

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

Class Method Details

.params ⇒ Object 



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# File 'lib/ciphr/functions/zlib.rb', line 91

def self.params 
  [:input]
end

.variants ⇒ Object 



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# File 'lib/ciphr/functions/zlib.rb', line 85

def self.variants
  [
    [['gzip','gz'], {}]
  ]
end

Instance Method Details

#apply ⇒ Object 



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# File 'lib/ciphr/functions/zlib.rb', line 53

def apply
  input = @args[0]
  sio = StringIO.new
  sio.binmode
  gz = !invert ? Zlib::GzipWriter.new(UncloseableIOProxy.new(sio)) : Zlib::GzipReader.new(input) 
  Proc.new do
    if invert # unzip
      gz.read(256)
    else # zip
      chunk = input.read(256)
      if chunk
        gz.write chunk 
        sio.rewind
        ret = sio.read
        sio.rewind
        sio.truncate(0)
        ret
      elsif gz
        gz.close
        gz = nil
        sio.rewind
        ret = sio.read
        sio.rewind
        sio.truncate(0)
        ret
      else
        nil
      end
    end
  end
end