decompress_text.rb

def decompress_text(file)
  input_file  = File.new file, 'rb'
  input  = input_file.read
  output = Zlib::GzipReader.new( StringIO.new( input ) ).read
  input_file.close

  File.open( file.gsub( '.zip', '.pdf' ), 'w' ) do |f|
    f << output
  end
end