From f7f23f92126994cfd6a9446c5de57e773827e46b Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 12 Jun 2019 20:02:46 +0900
Subject: [PATCH] [Modify] Polish it

---
 websocket-sharp/Ext.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 9c25ffe2..abff330b 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -1624,6 +1624,12 @@ namespace WebSocketSharp
       if (length < 0 || length > len - startIndex)
         throw new ArgumentOutOfRangeException ("length");
 
+      if (length == 0)
+        return new T[0];
+
+      if (length == len)
+        return array;
+
       var subArray = new T[length];
       Array.Copy (array, startIndex, subArray, 0, length);