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Generating data that can be compressed with a known ratio

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I'm looking for an algorithm I can use to generate data that will have a 
fixed compress ratio when compressed with an ideal compression
algorithm (or gzip as a practical compressor).

I want to produce files that will compress by a given percentage in
order to test performance of a filesystem with compression enabled.

Any ideas?

-- 
Ian Collins

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Generating data that can be compressed with a known ratio Ian Collins <ian-news@hotmail.com> - 2013-06-23 10:59 +1200
  Re: Generating data that can be compressed with a known ratio glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-06-22 23:24 +0000
  Re: Generating data that can be compressed with a known ratio SG <sgesemann@gmail.invalid> - 2013-06-23 01:45 +0200
  Re: Generating data that can be compressed with a known ratio hitchmanr@gmail.com - 2013-06-24 11:53 -0700
    Re: Generating data that can be compressed with a known ratio glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-06-24 19:15 +0000
      Re: Generating data that can be compressed with a known ratio hitchmanr@gmail.com - 2013-06-24 13:44 -0700
        Re: Generating data that can be compressed with a known ratio Ian Collins <ian-news@hotmail.com> - 2013-06-25 10:18 +1200
          Re: Generating data that can be compressed with a known ratio hitchmanr@gmail.com - 2013-06-24 16:57 -0700
            Re: Generating data that can be compressed with a known ratio Ian Collins <ian-news@hotmail.com> - 2013-06-25 13:58 +1200
  Re: Generating data that can be compressed with a known ratio Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2013-06-27 10:08 +0300

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