ROP addresses can get filtered for bad bytes/chars.

If the user does not want that the shellcode contains certain bytes (e.g. newlines, 0x0 etc), he can now define it in the rop object with the set_badbytes function.

rop.load_gadgets("gadgets")
rop.set_badbytes([0x01, 0xf9, 0x93, 0x95, 0x96, 0x40])
chain = rop.write_to_mem(0x11223344, "abcdefgh")

functions which filter badbytes:
write_to_mem
add_to_mem
write_to_mem_v2
func_call
_get_single_ret
_find_reg_setting_gadgets
_filter_reg_setting_gadgets
_get_sufficient_partial_controllers