Work in progres, please take a look and give early feedback if this is the way we want to structure…

src/vm/ffi.h

 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 #ifndef SRC_VM_FFI_H_
 #define SRC_VM_FFI_H_
 
 #include "src/shared/globals.h"
 #include "src/shared/natives.h"
 
 namespace fletch {
 
 class DefaultLibraryEntry;
 class Mutex;
 
 class ForeignFunctionInterface {
  public:
   static void Setup();
   static void TearDown();
   static void AddDefaultSharedLibrary(const char* library);
   static void* LookupInDefaultLibraries(const char* symbol);
  private:
   static DefaultLibraryEntry* libraries_;
   static Mutex* mutex_;
 };
 
+// Platform specific ffi constants and methods.
+class ForeignUtils {
+ public:
+  // We construct default bundle library paths from a prefix and a postfix.
+  static const char* kLibBundlePrefix;
+  static const char* kLibBundlePostfix;
+
+  // In preparation of supporting windows we have a function for this.
+  static char* DirectoryName(char* path);
+};
+
 }  // namespace fletch
 
 #endif  // SRC_VM_FFI_H_