# File lib/NADOLFile.rb, line 21
        def hex_dump
                #assumes file is a multiple of 16 bytes, which it always should be
                s=""
                (0..(@contents.length/16)-1).each {|line_number|
                         lhs=""
                         rhs=""
                         start_byte=line_number*16
                         line=@contents[start_byte..start_byte+15]
                         line.each_byte {|byte|
                                  lhs+= sprintf("%02X ", byte)
                                  rhs+= (byte%128).chr.sub(/[\x00-\x1f]/,'.')
                      }
                        s+=sprintf("%02X\t%s %s\n",start_byte,lhs,rhs)
                }
                s
        end