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diff --git a/include/ntfs-3g/ntfstime.h b/include/ntfs-3g/ntfstime.h new file mode 100755 index 0000000..2225d39 --- a/dev/null +++ b/include/ntfs-3g/ntfstime.h @@ -0,0 +1,131 @@ +/* + * ntfstime.h - NTFS time related functions. Originated from the Linux-NTFS project. + * + * Copyright (c) 2005 Anton Altaparmakov + * Copyright (c) 2005 Yura Pakhuchiy + * Copyright (c) 2010 Jean-Pierre Andre + * + * 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 NTFS-3G + * 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 + +#ifdef HAVE_TIME_H +#include <time.h> +#endif +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_GETTIMEOFDAY +#include <sys/time.h> +#endif + +#include "types.h" + +/* + * assume "struct timespec" is not defined if st_mtime is not defined + */ +#if !defined(st_mtime) & !defined(__timespec_defined) +/*struct timespec { + time_t tv_sec; + long tv_nsec; +} */; +#endif + +/* + * There are four times more conversions of internal representation + * to ntfs representation than any other conversion, so the most + * efficient internal representation is ntfs representation + * (with low endianness) + */ +typedef sle64 ntfs_time; + +#define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000) + +/** + * ntfs2timespec - 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: A Unix time (number of seconds since 1970, and nanoseconds) + */ +static __inline__ struct timespec ntfs2timespec(ntfs_time ntfstime) +{ + struct timespec spec; + s64 cputime; + + cputime = sle64_to_cpu(ntfstime); + spec.tv_sec = (cputime - (NTFS_TIME_OFFSET)) / 10000000; + spec.tv_nsec = (cputime - (NTFS_TIME_OFFSET) + - (s64)spec.tv_sec*10000000)*100; + /* force zero nsec for overflowing dates */ + if ((spec.tv_nsec < 0) || (spec.tv_nsec > 999999999)) + spec.tv_nsec = 0; + return (spec); +} + +/** + * timespec2ntfs - 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 + * with a separated non-negative nanosecond value + * + * NTFS uses Microsoft's standard time format which is stored in a sle64 and is + * measured as the number of 100 nano-second intervals since 1st January 1601, + * 00:00:00 UTC. + * + * Return: An NTFS time (100ns units since Jan 1601) + */ +static __inline__ ntfs_time timespec2ntfs(struct timespec spec) +{ + s64 units; + + units = (s64)spec.tv_sec * 10000000 + + NTFS_TIME_OFFSET + spec.tv_nsec/100; + return (cpu_to_le64(units)); +} + +/* + * Return the current time in ntfs format + */ + +static __inline__ ntfs_time ntfs_current_time(void) +{ + struct timespec now; + +#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_SYS_CLOCK_GETTIME) + clock_gettime(CLOCK_REALTIME, &now); +#elif defined(HAVE_GETTIMEOFDAY) + struct timeval microseconds; + + gettimeofday(µseconds, (struct timezone*)NULL); + now.tv_sec = microseconds.tv_sec; + now.tv_nsec = microseconds.tv_usec*1000; +#else + now.tv_sec = time((time_t*)NULL); + now.tv_nsec = 0; +#endif + return (timespec2ntfs(now)); +} + +#endif /* _NTFS_NTFSTIME_H */ |