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#!/bin/sh
#
# Copyright (C) 2018 Weijie Gao <hackpascal@gmail.com>
#
# Helper function to extract mac addresses from mtd part for Phicomm K2T
#

. /lib/functions.sh
. /lib/functions/system.sh
. /usr/share/libubox/jshn.sh

k2t_config_load() {
        local mtd_blk=$(find_mtd_part config)

        if [ -z "$mtd_blk" ]; then
                echo "k2t_config_load: no mtd part named config" >&2
                exit 1
        fi

        local json_size=$(dd if=$mtd_blk bs=1 count=8 2>/dev/null)

        json_size="0x$json_size"
        json_size=$((json_size))

        if [ "$?" -ne 0 ]; then
                echo "k2t_config_load: invalid json data size" >&2
                exit 2
        fi

        if [ "$json_size" -eq 0 ]; then
                echo "k2t_config_load: empty json data" >&2
                exit 3
        fi

        local json_data=$(dd if=$mtd_blk bs=1 skip=8 count=$json_size 2>/dev/null)

        json_load "$json_data"
}

k2t_get_mac() {
        local old_ns

        json_set_namespace "k2t" old_ns

        if k2t_config_load; then
                json_select "this_dev_info"
                json_get_var val "$1"
                json_select ..
        fi

        json_set_namespace old_ns

        echo $val
}