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70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* ntfstime.h - NTFS time related functions. Part of the Linux-NTFS project.
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*
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* Copyright (c) 2005 Anton Altaparmakov
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* Copyright (c) 2005 Yura Pakhuchiy
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_NTFSTIME_H
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#define _NTFS_NTFSTIME_H
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif
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#include "types.h"
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#define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000)
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/**
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* ntfs2utc - Convert an NTFS time to Unix time
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* @ntfs_time: An NTFS time in 100ns units since 1601
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*
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* NTFS stores times as the number of 100ns intervals since January 1st 1601 at
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* 00:00 UTC. This system will not suffer from Y2K problems until ~57000AD.
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*
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* Return: n A Unix time (number of seconds since 1970)
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*/
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static __inline__ time_t ntfs2utc(s64 ntfs_time)
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{
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return (sle64_to_cpu(ntfs_time) - (NTFS_TIME_OFFSET)) / 10000000;
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}
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/**
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* utc2ntfs - Convert Linux time to NTFS time
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* @utc_time: Linux time to convert to NTFS
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*
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* Convert the Linux time @utc_time to its corresponding NTFS time.
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*
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* Linux stores time in a long at present and measures it as the number of
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* 1-second intervals since 1st January 1970, 00:00:00 UTC.
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*
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* NTFS uses Microsoft's standard time format which is stored in a s64 and is
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* measured as the number of 100 nano-second intervals since 1st January 1601,
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* 00:00:00 UTC.
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*
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* Return: n An NTFS time (100ns units since Jan 1601)
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*/
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static __inline__ s64 utc2ntfs(time_t utc_time)
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{
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/* Convert to 100ns intervals and then add the NTFS time offset. */
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return cpu_to_sle64((s64)utc_time * 10000000 + NTFS_TIME_OFFSET);
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}
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#endif /* _NTFS_NTFSTIME_H */
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