mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
0d6b9cc742
Now that we have a hard dependency on python anyway, we can replace the slow shell script to calculate the option ROM checksum with a fast AND portable python version. Tested both with python 2.7 and 3.1. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
40 lines
778 B
Python
40 lines
778 B
Python
#
|
|
# Option ROM signing utility
|
|
#
|
|
# Authors:
|
|
# Jan Kiszka <jan.kiszka@siemens.com>
|
|
#
|
|
# This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
# See the COPYING file in the top-level directory.
|
|
|
|
import sys
|
|
import struct
|
|
|
|
if len(sys.argv) < 3:
|
|
print('usage: signrom.py input output')
|
|
sys.exit(1)
|
|
|
|
fin = open(sys.argv[1], 'rb')
|
|
fout = open(sys.argv[2], 'wb')
|
|
|
|
fin.seek(2)
|
|
size = ord(fin.read(1)) * 512 - 1
|
|
|
|
fin.seek(0)
|
|
data = fin.read(size)
|
|
fout.write(data)
|
|
|
|
checksum = 0
|
|
for b in data:
|
|
# catch Python 2 vs. 3 differences
|
|
if isinstance(b, int):
|
|
checksum += b
|
|
else:
|
|
checksum += ord(b)
|
|
checksum = (256 - checksum) % 256
|
|
|
|
# Python 3 no longer allows chr(checksum)
|
|
fout.write(struct.pack('B', checksum))
|
|
|
|
fin.close()
|
|
fout.close()
|