#!/usr/bin/env python
import os, sys, mmap
from random import randint
CAP = 0x20
RANDADDMAX = 0x20
with open(sys.argv[1], "r+b") as f:
map = mmap.mmap(f.fileno(), 0)
for index, char in enumerate(map):
if ord(char) < CAP:
map[index] = chr(ord(char) + randint(0, RANDADDMAX))
map.close()