Wes xx mediapipe integration

Packages/com.github.homuler.mediapipe/Runtime/Scripts/PInvoke/UnsafeNativeMethods.cs

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+// Copyright (c) 2021 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+using System;
+using System.Security;
+using System.Runtime.InteropServices;
+
+namespace Mediapipe
+{
+  [SuppressUnmanagedCodeSecurity]
+  internal static partial class UnsafeNativeMethods
+  {
+    internal const string MediaPipeLibrary =
+#if UNITY_EDITOR
+      "mediapipe_c";
+#elif UNITY_IOS || UNITY_WEBGL
+      "__Internal";
+#elif UNITY_ANDROID
+      "mediapipe_jni";
+#else
+      "mediapipe_c";
+#endif
+
+    static UnsafeNativeMethods()
+    {
+      mp_api__SetFreeHGlobal(FreeHGlobal);
+    }
+
+    private delegate void FreeHGlobalDelegate(IntPtr hglobal);
+
+    [AOT.MonoPInvokeCallback(typeof(FreeHGlobalDelegate))]
+    private static void FreeHGlobal(IntPtr hglobal)
+    {
+      Marshal.FreeHGlobal(hglobal);
+    }
+
+    [DllImport(MediaPipeLibrary, ExactSpelling = true)]
+    private static extern void mp_api__SetFreeHGlobal([MarshalAs(UnmanagedType.FunctionPtr)] FreeHGlobalDelegate freeHGlobal);
+  }
+}