blob: 146d119863f4bac2544e61aa81d7c4dfc03586ec (
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# -*- coding: utf-8 -*-
import sys
out = open(sys.argv[2], 'w')
buffering = False
buf = ""
with open(sys.argv[1], 'rb') as f:
f.read(256) # skip to $0100
while True:
byte = f.read(1)
if not byte:
break
# the program shall end with $FF followed only by $00 bytes
# for every $FF we hit, buffer until something that isn’t $00
if (not buffering and ord(byte) == 0xFF) or (buffering and ord(byte) == 0x00):
buf += byte
buffering = True
elif buffering and ord(byte) == 0xFF:
out.write(buf)
buf = byte
elif buffering:
out.write(buf)
out.write(byte)
buf = ""
buffering = False
else:
out.write(byte)
f.closed
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