gzip compression/decompression in Ruby

Recently I did some investigation compression and decompression in gzip format using Ruby. Here I posted my ruby code:

	require 'zlib'
	require 'stringio'
	require 'json'
	def gunzip(data)
	io = StringIO.new(data, "rb")
	gz = Zlib::GzipReader.new(io)
	decompressed = gz.read
	end
	def gzip(string)
	wio = StringIO.new("w")
	w_gz = Zlib::GzipWriter.new(wio)
	w_gz.write(string)
	w_gz.close
	compressed = wio.string
	end
	data = (1..100).collect {|i| {"id_#{i}" => "value_#{i}" } }
	contents = data.to_json
	compressed = gzip(contents)
	decompressed = gunzip(compressed)
	puts "compressed string:"
	puts compressed
	puts "decompressed success? #{decompressed == contents}"
	puts "uncompressed data size: #{contents.length}"
	puts "decompressed data size: #{compressed.length}"
	puts "compress ratio: #{compressed.length.to_f / contents.length.to_f}"

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