[host] initial NvFBC implementation

host/Util.h

@@ -0,0 +1,41 @@
+#pragma once
+#include <string>
+
+#include "common\debug.h"
+
+static class Util
+{
+public:
+  static std::string GetSystemRoot()
+  {
+    std::string defaultPath;
+
+    size_t pathSize;
+    char *libPath;
+
+    if (_dupenv_s(&libPath, &pathSize, "SystemRoot") != 0)
+    {
+      DEBUG_ERROR("Unable to get the SystemRoot environment variable");
+      return defaultPath;
+    }
+
+    if (!pathSize)
+    {
+      DEBUG_ERROR("The SystemRoot environment variable is not set");
+      return defaultPath;
+    }
+#ifdef _WIN64
+    defaultPath = std::string(libPath) + "\\System32";
+#else
+    if (IsWow64())
+    {
+      defaultPath = std::string(libPath) + "\\Syswow64";
+    }
+    else
+    {
+      defaultPath = std::string(libPath) + "\\System32";
+    }
+#endif
+    return defaultPath;
+  }
+};