blob: 4040337dd2d433533a7bbfc9c1518926275e58b8 [file] [log] [blame]
#!/bin/sh
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Takes a path to a file as first and only argument, removes the first 2048 B
# from that file and stores the result with the same name plus a '.bin' suffix.
# Useable to remove the header from UEFI Capsule files to use the resulting
# binary with flashrom.
main () {
if [ "$#" -lt 1 -o ! -r "$1" ]; then
echo "Removes the 2048 B header of UEFI Capsule files.\n"\
"Usage: $0 <FILE.CAP>"
return 1
fi
capsize=$(wc -c "$1" | cut -f 1 -d ' ')
binsize=$(($capsize-2048))
ispowoftwo=$(($binsize & ($binsize-1)))
if [ $ispowoftwo -ne 0 -o $binsize -eq 0 ]; then
echo "The size of the resulting file would not be a power of 2 (but $binsize B)."
return 1
fi
dd bs=2048 skip=1 if="$1" of="$1.bin"
}
main $*