Add Modifier model

Elwig/Helpers/Utils.cs

@@ -94,5 +94,15 @@ namespace Elwig.Helpers {
         public static double OeToKmw(double oe) {
             return Math.Round((-4.54 + Math.Sqrt(4.54 * 4.54 - 4 * 0.022 * -oe)) / 2 * 0.022, 1);
         }
+
+        public static decimal DecFromDb(long value, byte precision) {
+            bool neg = value < 0;
+            if (neg)  value = -value;
+            return new decimal((int)(value & 0xFFFFFFFF), (int)((value >> 32) & 0x7FFFFFFF), 0, neg, precision);
+        }
+
+        public static long DecToDb(decimal value, byte precision) {
+            return (long)decimal.Round(value * precision, 0);
+        }
     }
 }