Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.IO.Compression/SharpCompress/EnumExtensions.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace SharpCompress
+{
+    internal static class EnumExtensions
+    {
+        public static bool HasFlag(this Enum enumRef, Enum flag)
+        {
+            long value = Convert.ToInt64(enumRef);
+            long flagVal = Convert.ToInt64(flag);
+
+            return (value & flagVal) == flagVal;
+        }
+    }
+}