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             gzip_simple.rb
        
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        Jean-Philippe Lang
    
Added syntax highlightment for repository files (using CodeRay)....

              r638
            
      # =GZip Simple

      #

      # A simplified interface to the gzip library +zlib+ (from the Ruby Standard Library.)

      #

        Jean-Philippe Lang
    
Reverts r3014 (CodeRay back to 0.7.6)....

              r2965
            
      # Author: murphy (mail to murphy cYcnus de)

        Jean-Philippe Lang
    
Added syntax highlightment for repository files (using CodeRay)....

              r638
            
      #

      # Version: 0.2 (2005.may.28)

      #

      # ==Documentation

      #

      # See +GZip+ module and the +String+ extensions.

      #

      module GZip

        require 'zlib'

        # The default zipping level. 7 zips good and fast.

        DEFAULT_GZIP_LEVEL = 7

        # Unzips the given string +s+.

        #

        # Example:

        #   require 'gzip_simple'

        #   print GZip.gunzip(File.read('adresses.gz'))

        def GZip.gunzip s

          Zlib::Inflate.inflate s

        end

        # Zips the given string +s+.

        #

        # Example:

        #   require 'gzip_simple'

        #   File.open('adresses.gz', 'w') do |file

        #     file.write GZip.gzip('Mum: 0123 456 789', 9)

        #   end

        #

        # If you provide a +level+, you can control how strong

        # the string is compressed:

        # - 0: no compression, only convert to gzip format

        # - 1: compress fast

        # - 7: compress more, but still fast (default)

        # - 8: compress more, slower

        # - 9: compress best, very slow

        def GZip.gzip s, level = DEFAULT_GZIP_LEVEL

          Zlib::Deflate.new(level).deflate s, Zlib::FINISH

        end

      end

      # String extensions to use the GZip module.

      #

      # The methods gzip and gunzip provide an even more simple

      # interface to the ZLib:

      #

      #   # create a big string

      #   x = 'a' * 1000

      #   

      #   # zip it

      #   x_gz = x.gzip

      #   

      #   # test the result

      #   puts 'Zipped %d bytes to %d bytes.' % [x.size, x_gz.size]

      #   #-> Zipped 1000 bytes to 19 bytes.

      #   

      #   # unzipping works

      #   p x_gz.gunzip == x  #-> true

      class String

        # Returns the string, unzipped.

        # See GZip.gunzip

        def gunzip

          GZip.gunzip self

        end

        # Replaces the string with its unzipped value.

        # See GZip.gunzip

        def gunzip!

          replace gunzip

        end

        # Returns the string, zipped.

        # +level+ is the gzip compression level, see GZip.gzip.

        def gzip level = GZip::DEFAULT_GZIP_LEVEL

          GZip.gzip self, level

        end

        # Replaces the string with its zipped value.

        # See GZip.gzip.

        def gzip!(*args)

          replace gzip(*args)

        end

      end

      if $0 == __FILE__

        eval DATA.read, nil, $0, __LINE__+4

      end

      __END__

      #CODE

      # Testing / Benchmark

      x = 'a' * 1000

      x_gz = x.gzip

      puts 'Zipped %d bytes to %d bytes.' % [x.size, x_gz.size]  #-> Zipped 1000 bytes to 19 bytes.

      p x_gz.gunzip == x  #-> true

      require 'benchmark'

      INFO = 'packed to %0.3f%%'  # :nodoc:

      x = Array.new(100000) { rand(255).chr + 'aaaaaaaaa' + rand(255).chr }.join

      Benchmark.bm(10) do |bm|

        for level in 0..9

          bm.report "zip #{level}" do

            $x = x.gzip level

          end

          puts INFO % [100.0 * $x.size / x.size]

        end

        bm.report 'zip' do

          $x = x.gzip

        end

        puts INFO % [100.0 * $x.size / x.size]

        bm.report 'unzip' do

          $x.gunzip

        end

      end

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Jean-Philippe Lang Added syntax highlightment for repository files (using CodeRay)....	r638	# =GZip Simple
		#
		# A simplified interface to the gzip library +zlib+ (from the Ruby Standard Library.)
		#
Jean-Philippe Lang Reverts r3014 (CodeRay back to 0.7.6)....	r2965	# Author: murphy (mail to murphy cYcnus de)
Jean-Philippe Lang Added syntax highlightment for repository files (using CodeRay)....	r638	#
		# Version: 0.2 (2005.may.28)
		#
		# ==Documentation
		#
		# See +GZip+ module and the +String+ extensions.
		#
		module GZip

		require 'zlib'

		# The default zipping level. 7 zips good and fast.
		DEFAULT_GZIP_LEVEL = 7

		# Unzips the given string +s+.
		#
		# Example:
		# require 'gzip_simple'
		# print GZip.gunzip(File.read('adresses.gz'))
		def GZip.gunzip s
		Zlib::Inflate.inflate s
		end

		# Zips the given string +s+.
		#
		# Example:
		# require 'gzip_simple'
		# File.open('adresses.gz', 'w') do \|file
		# file.write GZip.gzip('Mum: 0123 456 789', 9)
		# end
		#
		# If you provide a +level+, you can control how strong
		# the string is compressed:
		# - 0: no compression, only convert to gzip format
		# - 1: compress fast
		# - 7: compress more, but still fast (default)
		# - 8: compress more, slower
		# - 9: compress best, very slow
		def GZip.gzip s, level = DEFAULT_GZIP_LEVEL
		Zlib::Deflate.new(level).deflate s, Zlib::FINISH
		end
		end


		# String extensions to use the GZip module.
		#
		# The methods gzip and gunzip provide an even more simple
		# interface to the ZLib:
		#
		# # create a big string
		# x = 'a' * 1000
		#
		# # zip it
		# x_gz = x.gzip
		#
		# # test the result
		# puts 'Zipped %d bytes to %d bytes.' % [x.size, x_gz.size]
		# #-> Zipped 1000 bytes to 19 bytes.
		#
		# # unzipping works
		# p x_gz.gunzip == x #-> true
		class String
		# Returns the string, unzipped.
		# See GZip.gunzip
		def gunzip
		GZip.gunzip self
		end
		# Replaces the string with its unzipped value.
		# See GZip.gunzip
		def gunzip!
		replace gunzip
		end

		# Returns the string, zipped.
		# +level+ is the gzip compression level, see GZip.gzip.
		def gzip level = GZip::DEFAULT_GZIP_LEVEL
		GZip.gzip self, level
		end
		# Replaces the string with its zipped value.
		# See GZip.gzip.
		def gzip!(*args)
		replace gzip(*args)
		end
		end

		if $0 == __FILE__
		eval DATA.read, nil, $0, __LINE__+4
		end

		__END__
		#CODE

		# Testing / Benchmark
		x = 'a' * 1000
		x_gz = x.gzip
		puts 'Zipped %d bytes to %d bytes.' % [x.size, x_gz.size] #-> Zipped 1000 bytes to 19 bytes.
		p x_gz.gunzip == x #-> true

		require 'benchmark'

		INFO = 'packed to %0.3f%%' # :nodoc:

		x = Array.new(100000) { rand(255).chr + 'aaaaaaaaa' + rand(255).chr }.join
		Benchmark.bm(10) do \|bm\|
		for level in 0..9
		bm.report "zip #{level}" do
		$x = x.gzip level
		end
		puts INFO % [100.0 * $x.size / x.size]
		end
		bm.report 'zip' do
		$x = x.gzip
		end
		puts INFO % [100.0 * $x.size / x.size]
		bm.report 'unzip' do
		$x.gunzip
		end
		end