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#!/usr/bin/python

import sys

import difflib

import binascii

from SFF import SFFMessage

file_a = sys.argv[1]

file_b = sys.argv[2]

download = sys.argv[3] # something like NEW DOWNLOAD 00 44 00 01 00 08 00 06 FF F8

fa = open(file_a)

fb = open(file_b)

fc = open('output', 'wb')

aline = fa.readline()

while aline.find(download) < 0:

aline = fa.readline()

bline = fb.readline()

while bline.find(download) < 0:

bline = fb.readline()

def print_line(line):

global fc

i = 9

while i < len(line):

bbyte = binascii.a2b_hex(line[i:i+2])

fc.write(bbyte)

i+=3

aline = fa.readline()

bline = fb.readline()

quit = False

while aline and not quit:

if aline != bline:

alen = int(aline[:3], 16)

blen = int(bline[:3], 16)

if alen > blen:

print_line( aline.strip())

else:

print_line( bline.strip())

else:

print_line( aline.strip())

aline = fa.readline()

bline = fb.readline()

if aline.find('NEW DOWNLOAD') >= 0:

quit = True

fc.close()