/*

  * Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

  *

  * Copyright (c) 2006

  * Francois Dumont

  *

  * This material is provided "as is", with absolutely no warranty expressed

  * or implied. Any use is at your own risk.

  *

  * Permission to use or copy this software for any purpose is hereby granted

  * without fee, provided the above notices are retained on all copies.

  * Permission to modify the code and to distribute modified code is granted,

  * provided the above notices are retained, and a notice that the code was

  * modified is included with the above copyright notice.

  *

  */

 #ifndef CPPUNIT_TIMER_H

 #define CPPUNIT_TIMER_H

 #ifndef __SYMBIAN32__

 #if defined (_WIN32)

 #  define CPPUNIT_WIN32_TIMER

 #  include <windows.h>

 #endif

 #endif

 class Timer {

 public:

   Timer() {

 #if defined (CPPUNIT_WIN32_TIMER)

     m_start.LowPart = m_restart.LowPart = m_stop.LowPart = 0;

     m_start.HighPart = m_restart.HighPart = m_stop.HighPart = 0;

     QueryPerformanceFrequency(&m_frequency);

 #endif

   }

   void start() {

 #if defined (CPPUNIT_WIN32_TIMER)

     QueryPerformanceCounter(&m_start);

 #endif

   }

   void restart() {

 #if defined (CPPUNIT_WIN32_TIMER)

     QueryPerformanceCounter(&m_restart);

     if (m_start.HighPart == 0 && m_start.LowPart == 0) {

       m_start = m_restart;

     }

 #endif

   }

   void stop() {

 #if defined (CPPUNIT_WIN32_TIMER)

     LARGE_INTEGER stop;

     QueryPerformanceCounter(&stop);

     if ((m_stop.HighPart != 0 || m_stop.LowPart != 0) &&

         m_restart.HighPart != 0 && m_restart.LowPart != 0) {

       m_stop.HighPart += (stop.HighPart - m_restart.HighPart);

       if (stop.LowPart < m_restart.LowPart) {

         if (m_restart.LowPart - stop.LowPart > m_stop.LowPart) {

           m_stop.HighPart -= 1;

         }

         m_stop.LowPart -= m_restart.LowPart - stop.LowPart;

       }

       else {

         if (stop.LowPart - m_restart.LowPart > 0xFFFFFFFF - m_stop.LowPart) {

           m_stop.HighPart += 1;

         }

         m_stop.LowPart += stop.LowPart - m_restart.LowPart;

       }

     }

     else {

       m_stop = stop;

     }

 #endif

   }

   double elapsedMilliseconds() const {

 #if defined (CPPUNIT_WIN32_TIMER)

     LARGE_INTEGER elapsed;

     elapsed.HighPart = m_stop.HighPart - m_start.HighPart;

     elapsed.LowPart = m_stop.LowPart - m_start.LowPart;

     return (double)elapsed.QuadPart / (double)m_frequency.QuadPart * 1000;

 #else

     return 0;

 #endif

   }

   static bool supported() {

 #if defined (CPPUNIT_WIN32_TIMER)

     return true;

 #else

     return false;

 #endif

   }

 private:

 #if defined (CPPUNIT_WIN32_TIMER)

   LARGE_INTEGER m_frequency;

   LARGE_INTEGER m_start, m_stop, m_restart;

 #endif

 };

 #endif