Render text from SID_MESSAGEBOX for chat gateway

Author: carlbennett

src/Atlasd/Battlenet/Protocols/Game/Messages/SID_MESSAGEBOX.cs

@@ -47,5 +47,29 @@ public override bool Invoke(MessageContext context)
             context.Client.Send(ToByteArray(context.Client.ProtocolType));
             return true;
         }
+
+        public new byte[] ToByteArray(ProtocolType protocolType)
+        {
+            if (protocolType.IsChat())
+            {
+                using var _m = new MemoryStream(Buffer);
+                using var r = new BinaryReader(_m);
+                var style = r.ReadUInt32();
+                var text = r.ReadByteString();
+                var caption = r.ReadByteString();
+
+                using var m = new MemoryStream();
+                using var w = new BinaryWriter(m);
+                w.Write($"{2000 + Id} MESSAGEBOX \"");
+                w.Write(text);
+                w.Write('"');
+                w.Write(Battlenet.Common.NewLine);
+                return m.GetBuffer();
+            }
+            else
+            {
+                return base.ToByteArray(protocolType);
+            }
+        }
     }
 }