# File lib/spreadsheet/olewriter.rb, line 20
   def initialize(arg)
      if arg.kind_of?(String)
        @io = File.open(arg, "w")
      else
        @io = arg
      end
      @io.binmode

      @biff_only     = false
      @size_allowed  = true
      @biff_size     = 0
      @book_size     = 0
      @big_blocks    = 0
      @list_blocks   = 0
      @root_start    = 0
      @block_count   = 4
   end