qdev: split out UI portions into a new function
[qemu.git] / scripts / signrom.sh
1 #!/bin/sh
2
3 # Option ROM Signing utility
4 #
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2 of the License, or
8 # (at your option) any later version.
9 #
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, see <http://www.gnu.org/licenses/>.
17 #
18 # Copyright Novell Inc, 2009
19 # Authors: Alexander Graf <agraf@suse.de>
20 #
21 # Syntax: signrom.sh <input> <output>
22
23 # did we get proper arguments?
24 test "$1" -a "$2" || exit 1
25
26 sum=0
27
28 # find out the file size
29 x=`dd if="$1" bs=1 count=1 skip=2 2>/dev/null | od -t u1 -A n`
30 #size=`expr $x \* 512 - 1`
31 size=$(( $x * 512 - 1 ))
32
33 # now get the checksum
34 nums=`od -A n -t u1 -v -N $size "$1"`
35 for i in ${nums}; do
36 # add each byte's value to sum
37 sum=`expr \( $sum + $i \) % 256`
38 done
39
40 sum=$(( (256 - $sum) % 256 ))
41 sum_octal=$( printf "%o" $sum )
42
43 # and write the output file
44 cp "$1" "$2"
45 printf "\\$sum_octal" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null