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author | Jan Kiszka <jan.kiszka@siemens.com> | 2012-01-27 19:44:53 +0100 |
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committer | Jan Kiszka <jan.kiszka@siemens.com> | 2012-04-16 15:41:20 +0200 |
commit | 0d6b9cc7420dd2d531b48508f0d4083d1c6a632a (patch) | |
tree | ae3bae24b4b18ad28fedbed9da949c1198cbd3d6 /scripts | |
parent | e6f5d0be730a41bacb10edba19d1369ec2949486 (diff) | |
download | qemu-0d6b9cc7420dd2d531b48508f0d4083d1c6a632a.zip qemu-0d6b9cc7420dd2d531b48508f0d4083d1c6a632a.tar.gz qemu-0d6b9cc7420dd2d531b48508f0d4083d1c6a632a.tar.bz2 |
signrom: Rewrite as python script
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>
Diffstat (limited to 'scripts')
-rw-r--r-- | scripts/signrom.py | 40 | ||||
-rwxr-xr-x | scripts/signrom.sh | 45 |
2 files changed, 40 insertions, 45 deletions
diff --git a/scripts/signrom.py b/scripts/signrom.py new file mode 100644 index 0000000..f9c35cc --- /dev/null +++ b/scripts/signrom.py @@ -0,0 +1,40 @@ +# +# 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() diff --git a/scripts/signrom.sh b/scripts/signrom.sh deleted file mode 100755 index 9dc5c63..0000000 --- a/scripts/signrom.sh +++ /dev/null @@ -1,45 +0,0 @@ -#!/bin/sh - -# Option ROM Signing utility -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or -# (at your option) any later version. -# -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, see <http://www.gnu.org/licenses/>. -# -# Copyright Novell Inc, 2009 -# Authors: Alexander Graf <agraf@suse.de> -# -# Syntax: signrom.sh <input> <output> - -# did we get proper arguments? -test "$1" -a "$2" || exit 1 - -sum=0 - -# find out the file size -x=`dd if="$1" bs=1 count=1 skip=2 2>/dev/null | od -t u1 -A n` -#size=`expr $x \* 512 - 1` -size=$(( $x * 512 - 1 )) - -# now get the checksum -nums=`od -A n -t u1 -v -N $size "$1"` -for i in ${nums}; do - # add each byte's value to sum - sum=`expr \( $sum + $i \) % 256` -done - -sum=$(( (256 - $sum) % 256 )) -sum_octal=$( printf "%o" $sum ) - -# and write the output file -cp "$1" "$2" -printf "\\$sum_octal" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null |