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122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*
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* ntfstime.h - NTFS time related functions. Originated from 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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* Copyright (c) 2010 Jean-Pierre Andre
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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 NTFS-3G
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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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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_GETTIMEOFDAY
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#include <sys/time.h>
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#endif
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#include "types.h"
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/*
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* There are four times more conversions of internal representation
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* to ntfs representation than any other conversion, so the most
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* efficient internal representation is ntfs representation
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* (with low endianness)
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*/
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typedef sle64 ntfs_time;
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#define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000)
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/**
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* ntfs2timespec - 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: A Unix time (number of seconds since 1970, and nanoseconds)
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*/
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static __inline__ struct timespec ntfs2timespec( ntfs_time ntfstime )
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{
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struct timespec spec;
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s64 cputime;
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cputime = sle64_to_cpu( ntfstime );
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spec.tv_sec = ( cputime - ( NTFS_TIME_OFFSET ) ) / 10000000;
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spec.tv_nsec = ( cputime - ( NTFS_TIME_OFFSET )
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- ( s64 )spec.tv_sec*10000000 )*100;
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/* force zero nsec for overflowing dates */
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if ( ( spec.tv_nsec < 0 ) || ( spec.tv_nsec > 999999999 ) )
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spec.tv_nsec = 0;
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return ( spec );
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}
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/**
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* timespec2ntfs - 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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* with a separated non-negative nanosecond value
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*
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* NTFS uses Microsoft's standard time format which is stored in a sle64 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: An NTFS time (100ns units since Jan 1601)
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*/
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static __inline__ ntfs_time timespec2ntfs( struct timespec spec )
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{
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s64 units;
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units = ( s64 )spec.tv_sec * 10000000
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+ NTFS_TIME_OFFSET + spec.tv_nsec / 100;
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return ( cpu_to_le64( units ) );
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}
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/*
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* Return the current time in ntfs format
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*/
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static __inline__ ntfs_time ntfs_current_time( void )
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{
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struct timespec now;
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#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_SYS_CLOCK_GETTIME)
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clock_gettime( CLOCK_REALTIME, &now );
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#elif defined(HAVE_GETTIMEOFDAY)
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struct timeval microseconds;
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gettimeofday( µseconds, ( struct timezone* )NULL );
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now.tv_sec = microseconds.tv_sec;
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now.tv_nsec = microseconds.tv_usec * 1000;
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#else
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now.tv_sec = time( ( time_t* )NULL );
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now.tv_nsec = 0;
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#endif
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return ( timespec2ntfs( now ) );
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}
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#endif /* _NTFS_NTFSTIME_H */
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