Function timestamp_from_filetime

v2/engine/timestamp.c:82–100

 */

void timestamp_from_filetime( timestamp * const t, FILETIME const * const ft )
{
    /* Seconds between 1.1.1601 and 1.1.1970 */
    static __int64 const secs_between_epochs = 11644473600;

    /* We can not simply cast and dereference a FILETIME, since it might not be
     * aligned properly. __int64 type variables are expected to be aligned to an
     * 8 byte boundary while FILETIME structures may be aligned to any 4 byte
     * boundary. Using an incorrectly aligned __int64 variable may cause a
     * performance penalty on some platforms or even exceptions on others
     * (documented on MSDN).
     */
    __int64 in;
    memcpy( &in, ft, sizeof( in ) );

    /* FILETIME resolution: 100ns. */
    timestamp_init( t, (time_t)( ( in / 10000000 ) - secs_between_epochs ),
        (int)( in % 10000000 ) * 100 );
}
#endif  /* OS_NT */