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