pfcoder

import os
from struct import *

def read_as_byte(filename):
    handle = open(filename, 'rb')
    fsize = os.path.getsize(filename)
    contents = handle.read(fsize)
    byteArray = unpack(str(fsize)+'B',contents)
    return byteArray

def savefile(data, filename):
    string = ''
    for byte in data:
        string = string+chr(byte)
    fp = open(filename, 'w')
    fp.write(string)
    fp.close()

dec_key = read_as_byte('./canon_ps.key')
enc_file = read_as_byte('./PictureStyle.pf2')

i = -11
dec = []

for ef in enc_file:
    if (i > -1):
        dec.append(ef^dec_key[i])
        i = i%(512*513)
    else:
        dec.append(ef)
    i = i+1
savefile(dec, './PictureStyle.decoded.pf2')