new: parsing BLE flags and company identifiers from advertisements

vendor/github.com/nbutton23/zxcvbn-go/utils/math/mathutils.go

@@ -0,0 +1,40 @@
+package zxcvbn_math
+
+import "math"
+
+/**
+I am surprised that I have to define these. . . Maybe i just didn't look hard enough for a lib.
+*/
+
+//http://blog.plover.com/math/choose.html
+func NChoseK(n, k float64) float64 {
+	if k > n {
+		return 0
+	} else if k == 0 {
+		return 1
+	}
+
+	var r float64 = 1
+
+	for d := float64(1); d <= k; d++ {
+		r *= n
+		r /= d
+		n--
+	}
+
+	return r
+}
+
+func Round(val float64, roundOn float64, places int) (newVal float64) {
+	var round float64
+	pow := math.Pow(10, float64(places))
+	digit := pow * val
+	_, div := math.Modf(digit)
+	if div >= roundOn {
+		round = math.Ceil(digit)
+	} else {
+		round = math.Floor(digit)
+	}
+	newVal = round / pow
+	return
+}