package network

import (
    "fmt"
	"strings"
    "math/big"
)

var manuf = #MAP#

func ManufLookup(mac string) string {
    macHex := strings.Replace(mac, ":", "", -1)
    macInt := new(big.Int)

    if _, ok := macInt.SetString(macHex, 16); ok == false {
        return ""
    }

    for mask := uint(0); mask < 48; mask++ {
        shifted := new(big.Int).Rsh(macInt, mask)
        key := fmt.Sprintf("%d.%s", mask, shifted)
        if vendor, found := manuf[key]; found {
            return vendor
        }   
    }

	return ""
}