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rails--rails/activesupport/lib/active_support/gzip.rb

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require 'zlib'
require 'stringio'
module ActiveSupport
# A convenient wrapper for the zlib standard library that allows compression/decompression of strings with gzip.
module Gzip
class Stream < StringIO
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