Added multiplayer plugin

Assets/Mirror/Runtime/Transport/Telepathy/Utils.cs

@@ -0,0 +1,44 @@
+namespace Telepathy
+{
+    public static class Utils
+    {
+        // fast int to byte[] conversion and vice versa
+        // -> test with 100k conversions:
+        //    BitConverter.GetBytes(ushort): 144ms
+        //    bit shifting: 11ms
+        // -> 10x speed improvement makes this optimization actually worth it
+        // -> this way we don't need to allocate BinaryWriter/Reader either
+        // -> 4 bytes because some people may want to send messages larger than
+        //    64K bytes
+        // => big endian is standard for network transmissions, and necessary
+        //    for compatibility with erlang
+        public static byte[] IntToBytesBigEndian(int value)
+        {
+            return new byte[] {
+                (byte)(value >> 24),
+                (byte)(value >> 16),
+                (byte)(value >> 8),
+                (byte)value
+            };
+        }
+
+        // IntToBytes version that doesn't allocate a new byte[4] each time.
+        // -> important for MMO scale networking performance.
+        public static void IntToBytesBigEndianNonAlloc(int value, byte[] bytes)
+        {
+            bytes[0] = (byte)(value >> 24);
+            bytes[1] = (byte)(value >> 16);
+            bytes[2] = (byte)(value >> 8);
+            bytes[3] = (byte)value;
+        }
+
+        public static int BytesToIntBigEndian(byte[] bytes)
+        {
+            return
+                (bytes[0] << 24) |
+                (bytes[1] << 16) |
+                (bytes[2] << 8) |
+                bytes[3];
+        }
+    }
+}