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Diffstat (limited to 'vendor/gems/coderay-0.9.7/lib/coderay/helpers/gzip_simple.rb')
-rw-r--r-- | vendor/gems/coderay-0.9.7/lib/coderay/helpers/gzip_simple.rb | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/vendor/gems/coderay-0.9.7/lib/coderay/helpers/gzip_simple.rb b/vendor/gems/coderay-0.9.7/lib/coderay/helpers/gzip_simple.rb new file mode 100644 index 000000000..b979f665b --- /dev/null +++ b/vendor/gems/coderay-0.9.7/lib/coderay/helpers/gzip_simple.rb @@ -0,0 +1,123 @@ +# =GZip Simple +# +# A simplified interface to the gzip library +zlib+ (from the Ruby Standard Library.) +# +# Author: murphy (mail to murphy rubychan de) +# +# 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 |