Update MemoryStreamReader.cs

ZeroLevel/Services/Serialization/MemoryStreamReader.cs

@@ -13,7 +13,7 @@ namespace ZeroLevel.Services.Serialization
     public sealed class MemoryStreamReader
         : IBinaryReader
     {
-        private readonly MemoryStream _stream;
+        private readonly Stream _stream;
 
         public MemoryStreamReader(byte[] data)
         {
@@ -22,6 +22,13 @@ namespace ZeroLevel.Services.Serialization
             _stream = new MemoryStream(data);
         }
 
+        public MemoryStreamReader(Stream stream)
+        {
+            if (stream == null)
+                throw new ArgumentNullException(nameof(stream));
+            _stream = stream;
+        }
+
         /// <summary>
         /// Flag reading
         /// </summary>