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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.
#
# 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, level=Zlib::DEFAULT_COMPRESSION, strategy=Zlib::DEFAULT_STRATEGY)
output = Stream.new
gz = Zlib::GzipWriter.new(output, level, strategy)
gz.write(source)
gz.close
output.string
end
end
end
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