# Copyright (C) 2019 Robert Marko <robimarko@gmail.com>
# Copyright (C) 2019 Roger Pueyo Centelles <roger.pueyo@guifi.net>
#
# Helper function to extract MAC addresses and calibration data for MikroTik
#

mikrotik_caldata_extract() {
	local part=$1
	local offset=$(($2))
	local count=$(($3))
	local mtd
	local erdfile="/tmp/erd.bin"
	local fwfile="/lib/firmware/${FIRMWARE}"

	[ -e $fwfile ] && exit 0

	mtd=$(find_mtd_chardev $part)
	[ -n "$mtd" ] || caldata_die "no mtd device found for partition $part"

	rbextract -e $mtd $erdfile

	dd if=$erdfile of=$fwfile iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
		caldata_die "failed to extract calibration data from $mtd"

	rm -f $erdfile
}