/*

 * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#include "SystemTime.h"

#include <windows.h>

namespace WebCore {

double currentTime()

{

    FILETIME ft;

    GetSystemTimeAsFileTime(&ft);

    // As per Windows documentation for FILETIME, copy the resulting FILETIME structure to a

    // ULARGE_INTEGER structure using memcpy (using memcpy instead of direct assignment can

    // prevent alignment faults on 64-bit Windows).

    ULARGE_INTEGER t;

    memcpy(&t, &ft, sizeof(t));

    // Windows file times are in 100s of nanoseconds.

    // To convert to seconds, we have to divide by 10,000,000, which is more quickly

    // done by multiplying by 0.0000001.

    // Between January 1, 1601 and January 1, 1970, there were 369 complete years,

    // of which 89 were leap years (1700, 1800, and 1900 were not leap years).

    // That is a total of 134774 days, which is 11644473600 seconds.

    return t.QuadPart * 0.0000001 - 11644473600.0;

}

}