From 0cd36dc6151d7ce2b1302d0396a47d74a52c9a6d Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Tue, 2 Oct 2018 19:42:58 +0900
Subject: [PATCH] [Modify] Add it

---
 websocket-sharp/Net/HttpUtility.cs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index 167da146..83ba1645 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -178,6 +178,29 @@ namespace WebSocketSharp.Net
       return buff.ToString ();
     }
 
+    private static string htmlEncode (string s, bool attribute)
+    {
+      var buff = new StringBuilder ();
+
+      foreach (var c in s) {
+        buff.Append (
+          c == '"'
+          ? "&quot;"
+          : c == '&'
+            ? "&amp;"
+            : c == '<'
+              ? "&lt;"
+              : c == '>'
+                ? "&gt;"
+                : !attribute && c > 159
+                  ? String.Format ("&#{0};", (int) c)
+                  : c.ToString ()
+        );
+      }
+
+      return buff.ToString ();
+    }
+
     private static void initEntities ()
     {
       // Build the dictionary of HTML entity references.