# File lib/pdf/reader/filter.rb, line 72
    def ascii85(data)
      data = "<~#{data}" unless data.to_s[0,2] == "<~"
      Ascii85::decode(data)
    rescue Exception => e
      # Oops, there was a problem decoding the stream
      raise MalformedPDFError, "Error occured while decoding an ASCII85 stream (#{e.class.to_s}: #{e.to_s})"
    end