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 // Copyright (c) 2011 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #ifndef SANDBOX_SRC_WOW64_H__

 #define SANDBOX_SRC_WOW64_H__

 #include <windows.h>

 #include "base/basictypes.h"

 #include "sandbox/win/src/sandbox_types.h"

 namespace sandbox {

 class TargetProcess;

 // This class wraps the code needed to interact with the Windows On Windows

 // subsystem on 64 bit OSes, from the point of view of interceptions.

 class Wow64 {

  public:

   Wow64(TargetProcess* child, HMODULE ntdll)

       : child_(child), ntdll_(ntdll), dll_load_(NULL), continue_load_(NULL) {}

   ~Wow64();

   // Waits for the 32 bit DLL to get loaded on the child process. This function

   // will return immediately if not running under WOW, or launch the helper

   // process and wait until ntdll is ready.

   bool WaitForNtdll();

  private:

   // Runs the WOW helper process, passing the address of a buffer allocated on

   // the child (one page).

   bool RunWowHelper(void* buffer);

   // This method receives "notifications" whenever a DLL is mapped on the child.

   bool DllMapped();

   // Returns true if ntdll.dll is mapped on the child.

   bool NtdllPresent();

   TargetProcess* child_;  // Child process.

   HMODULE ntdll_;         // ntdll on the parent.

   HANDLE dll_load_;       // Event that is signaled on dll load.

   HANDLE continue_load_;  // Event to signal to continue execution on the child.

   DISALLOW_IMPLICIT_CONSTRUCTORS(Wow64);

 };

 }  // namespace sandbox

 #endif  // SANDBOX_SRC_WOW64_H__