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#!/bin/sh
#
# Copyright (C) 2018 Oceanic Systems (UK) Ltd
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
# Maintained by: Ryan Pannell <ryan [at] o s u k l .com> <github.com/Escalion>
#
# Write Linksys signature for factory image
# This is appended to the factory image and is tested by the Linksys Upgrader - as observed in civic.
# The footer is 256 bytes. The format is:
# .LINKSYS. This is detected by the Linksys upgrader before continuing with upgrade. (9 bytes)
# <VERSION> The version number of upgrade. Not checked so use arbitrary value (8 bytes)
# <TYPE> Model of target device, padded (0x20) to (15 bytes)
# <CRC> CRC checksum of the image to flash (8 byte)
# <padding> Padding (0x20) (7 bytes)
# <signature> Signature of signer. Not checked so use arbitrary value (16 bytes)
# <padding> Padding (0x00) (192 bytes)
# 0x0A (1 byte)
## version history
# * version 1: initial commit
set -e
ME="${0##*/}"
usage() {
echo "Usage: $ME <type> <in filename>"
[ "$IMG_OUT" ] && rm -f "$IMG_OUT"
exit 1
}
[ "$#" -lt 3 ] && usage
TYPE=$1
tmpdir="$( mktemp -d 2> /dev/null )"
if [ -z "$tmpdir" ]; then
# try OSX signature
tmpdir="$( mktemp -t 'ubitmp' -d )"
fi
if [ -z "$tmpdir" ]; then
exit 1
fi
trap "rm -rf $tmpdir" EXIT
IMG_TMP_OUT="${tmpdir}/out"
IMG_IN=$2
IMG_OUT="${IMG_IN}.new"
[ ! -f "$IMG_IN" ] && echo "$ME: Not a valid image: $IMG_IN" && usage
dd if="${IMG_IN}" of="${IMG_TMP_OUT}"
CRC=$(printf "%08X" $(dd if="${IMG_IN}" bs=$(stat -c%s "${IMG_IN}") count=1|cksum| cut -d ' ' -f1))
printf ".LINKSYS.01000409%-15s%-8s%-7s%-16s" "${TYPE}" "${CRC}" "" "K0000000F0246434" >> "${IMG_TMP_OUT}"
dd if=/dev/zero bs=1 count=192 conv=notrunc >> "${IMG_TMP_OUT}"
printf '\12' >> "${IMG_TMP_OUT}"
cp "${IMG_TMP_OUT}" "${IMG_OUT}"
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