Import code from old v4 repo

src/ca/dllmain.cpp

@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+/********************************************************************
+DllMain - standard entry point for all WiX custom actions.
+
+********************************************************************/
+extern "C" BOOL WINAPI DllMain(
+    IN HINSTANCE hInstance,
+    IN ULONG ulReason,
+    IN LPVOID)
+{
+    switch(ulReason)
+    {
+    case DLL_PROCESS_ATTACH:
+        WcaGlobalInitialize(hInstance);
+        ::DisableThreadLibraryCalls(hInstance);
+        break;
+
+    case DLL_PROCESS_DETACH:
+        WcaGlobalFinalize();
+        break;
+    }
+
+    return TRUE;
+}

src/ca/precomp.h

@@ -0,0 +1,18 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+
+#include <windows.h>
+#include <msiquery.h>
+#include <intsafe.h>
+#include <strsafe.h>
+
+#include "wcautil.h"
+#include "fileutil.h"
+#include "strutil.h"
+#include "memutil.h"
+#include "regutil.h"
+#include "dictutil.h"
+#include "deputil.h"
+
+#include "CustomMsiErrors.h"