Leaked source code of windows server 2003
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// nmtime.h - defines DOS packed date and time types
//
// Copyright (c) 1987-1990, Microsoft Corporation. All rights reserved.
//
// Purpose:
// This file defines the DOS packed date and time types.
//
// Revision History:
// 19-May-1993 HV Changed _dtoxtime() to _dostotime_t() so that we can
// use the standard llibce.lib instead of the private
// llibcer.lib.
// 04-Dec-1989 SB added proper fn proto for _dtoxtime() (c6 -W3 reqmemt)
// 05-Dec-1988 SB added CDECL for _dtoxtime()
// ??-???-???? ?? Taken from dostypes.h
#define MASK4 0xf // 4 bit mask
#define MASK5 0x1f // 5 bit mask
#define MASK6 0x3f // 6 bit mask
#define MASK7 0x7f // 7 bit mask
#define DAYLOC 0 // day value starts in bit 0
#define MONTHLOC 5 // month value starts in bit 5
#define YEARLOC 9 // year value starts in bit 9
#define SECLOC 0 // seconds value starts in bit 0
#define MINLOC 5 // minutes value starts in bit 5
#define HOURLOC 11 // hours value starts in bit 11
#define DOS_DAY(dword) (((dword) >> DAYLOC) & MASK5)
#define DOS_MONTH(dword) (((dword) >> MONTHLOC) & MASK4)
#define DOS_YEAR(dword) (((dword) >> YEARLOC) & MASK7)
#define DOS_HOUR(tword) (((tword) >> HOURLOC) & MASK5)
#define DOS_MIN(tword) (((tword) >> MINLOC) & MASK6)
#define DOS_SEC(tword) (((tword) >> SECLOC) & MASK5)
extern time_t CDECL _dostotime_t(int, int, int, int, int, int);
#define XTIME(d,t) _dostotime_t(DOS_YEAR(d), \
DOS_MONTH(d), \ DOS_DAY(d), \ DOS_HOUR(t), \ DOS_MIN(t), \ DOS_SEC(t)*2)
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