cap2bin.py

# convert Intel firmware update capsules to plain binaries

import sys
import os.path
import struct

fn = sys.argv[1]
inf = open(fn, "rb")
inf.seek(0xC8)
e=[]
while True:
 sz, off = struct.unpack("<II", inf.read(8))
 print "off: %08X, sz: %08X" % (off, sz)
 inf.read(32-8)
 if e:
  prevsz, prevoff = e[-1]
  if prevoff+prevsz != off:
    print " end?"
    break
 e.append((sz,off))

base, ext = os.path.splitext(fn)
of = open(base+".bin","wb")
for sz, off in e:
 inf.seek(off)
 of.write(inf.read(sz))

inf.close()
of.close()