require 'zlib' require 'stringio' module ActiveSupport # A convenient wrapper for the zlib standard library that allows # compression/decompression of strings with gzip. # # gzip = ActiveSupport::Gzip.compress('compress me!') # # => "\x1F\x8B\b\x00o\x8D\xCDO\x00\x03K\xCE\xCF-(J-.V\xC8MU\x04\x00R>n\x83\f\x00\x00\x00" # # ActiveSupport::Gzip.decompress(gzip) # # => "compress me!" module Gzip class Stream < StringIO def initialize(*) super set_encoding "BINARY" 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