require 'zlib' 
require 'stringio' 
 
 
module GZip    
  class Stream < StringIO
    def close; rewind; end
  end
  
  def self.decompress(source)
    Zlib::GzipReader.new(StringIO.new(source)).read
  end  
  
  def self.compress(source)      
    output = Stream.new
    gz = Zlib::GzipWriter.new(output) 
    gz.write(source) 
    gz.close 
    output.string
  end  
end