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Annotation of qemu/pc-bios/optionrom/signrom.sh, revision 1.1

1.1     ! root        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 <[email protected]>
        !            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 "$1"`
        !            35: for i in ${nums}; do
        !            36:     # add each byte's value to sum
        !            37:     sum=`expr $sum + $i`
        !            38: done
        !            39: 
        !            40: sum=$(( $sum % 256 ))
        !            41: sum=$(( 256 - $sum ))
        !            42: sum_octal=$( printf "%o" $sum )
        !            43: 
        !            44: # and write the output file
        !            45: cp "$1" "$2"
        !            46: printf "\\$sum_octal" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null

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