require 'zlib' require 'stringio' require 'active_support/core_ext/string/encoding' module ActiveSupport # A convenient wrapper for the zlib standard library that allows compression/decompression of strings with gzip. module Gzip class Stream < StringIO def initialize(*) super set_encoding "BINARY" if "".encoding_aware? end def close; rewind; end end # Decompresses a gzipped string. def self.decompress(source) Zlib::GzipReader.new(StringIO.new(source)).read end # Compresses a string using gzip. def self.compress(source) output = Stream.new gz = Zlib::GzipWriter.new(output) gz.write(source) gz.close output.string end end end