blob: 99311e21130d00601024680b837ed23ae62c5961
1 | /* |
2 | * ntfstime.h - NTFS time related functions. Originated from the Linux-NTFS project. |
3 | * |
4 | * Copyright (c) 2005 Anton Altaparmakov |
5 | * Copyright (c) 2005 Yura Pakhuchiy |
6 | * Copyright (c) 2010 Jean-Pierre Andre |
7 | * |
8 | * This program/include file is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License as published |
10 | * by the Free Software Foundation; either version 2 of the License, or |
11 | * (at your option) any later version. |
12 | * |
13 | * This program/include file is distributed in the hope that it will be |
14 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program (in the main directory of the NTFS-3G |
20 | * distribution in the file COPYING); if not, write to the Free Software |
21 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
22 | */ |
23 | |
24 | #ifndef _NTFS_NTFSTIME_H |
25 | #define _NTFS_NTFSTIME_H |
26 | |
27 | #ifdef HAVE_TIME_H |
28 | #include <time.h> |
29 | #endif |
30 | #ifdef HAVE_SYS_STAT_H |
31 | #include <sys/stat.h> |
32 | #endif |
33 | #ifdef HAVE_GETTIMEOFDAY |
34 | #include <sys/time.h> |
35 | #endif |
36 | |
37 | #include "types.h" |
38 | |
39 | /* |
40 | * assume "struct timespec" is not defined if st_mtime is not defined |
41 | */ |
42 | //#if !defined(st_mtime) & !defined(__timespec_defined) |
43 | //struct timespec { |
44 | // time_t tv_sec; |
45 | // long tv_nsec; |
46 | //} ; |
47 | //#endif |
48 | |
49 | /* |
50 | * There are four times more conversions of internal representation |
51 | * to ntfs representation than any other conversion, so the most |
52 | * efficient internal representation is ntfs representation |
53 | * (with low endianness) |
54 | */ |
55 | typedef sle64 ntfs_time; |
56 | |
57 | #define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000) |
58 | |
59 | /** |
60 | * ntfs2timespec - Convert an NTFS time to Unix time |
61 | * @ntfs_time: An NTFS time in 100ns units since 1601 |
62 | * |
63 | * NTFS stores times as the number of 100ns intervals since January 1st 1601 at |
64 | * 00:00 UTC. This system will not suffer from Y2K problems until ~57000AD. |
65 | * |
66 | * Return: A Unix time (number of seconds since 1970, and nanoseconds) |
67 | */ |
68 | static __inline__ struct timespec ntfs2timespec(ntfs_time ntfstime) |
69 | { |
70 | struct timespec spec; |
71 | s64 cputime; |
72 | |
73 | cputime = sle64_to_cpu(ntfstime); |
74 | spec.tv_sec = (cputime - (NTFS_TIME_OFFSET)) / 10000000; |
75 | spec.tv_nsec = (cputime - (NTFS_TIME_OFFSET) |
76 | - (s64)spec.tv_sec*10000000)*100; |
77 | /* force zero nsec for overflowing dates */ |
78 | if ((spec.tv_nsec < 0) || (spec.tv_nsec > 999999999)) |
79 | spec.tv_nsec = 0; |
80 | return (spec); |
81 | } |
82 | |
83 | /** |
84 | * timespec2ntfs - Convert Linux time to NTFS time |
85 | * @utc_time: Linux time to convert to NTFS |
86 | * |
87 | * Convert the Linux time @utc_time to its corresponding NTFS time. |
88 | * |
89 | * Linux stores time in a long at present and measures it as the number of |
90 | * 1-second intervals since 1st January 1970, 00:00:00 UTC |
91 | * with a separated non-negative nanosecond value |
92 | * |
93 | * NTFS uses Microsoft's standard time format which is stored in a sle64 and is |
94 | * measured as the number of 100 nano-second intervals since 1st January 1601, |
95 | * 00:00:00 UTC. |
96 | * |
97 | * Return: An NTFS time (100ns units since Jan 1601) |
98 | */ |
99 | static __inline__ ntfs_time timespec2ntfs(struct timespec spec) |
100 | { |
101 | s64 units; |
102 | |
103 | units = (s64)spec.tv_sec * 10000000 |
104 | + NTFS_TIME_OFFSET + spec.tv_nsec/100; |
105 | return (cpu_to_le64(units)); |
106 | } |
107 | |
108 | /* |
109 | * Return the current time in ntfs format |
110 | */ |
111 | |
112 | static __inline__ ntfs_time ntfs_current_time(void) |
113 | { |
114 | struct timespec now; |
115 | |
116 | #if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_SYS_CLOCK_GETTIME) |
117 | clock_gettime(CLOCK_REALTIME, &now); |
118 | #elif defined(HAVE_GETTIMEOFDAY) |
119 | struct timeval microseconds; |
120 | |
121 | gettimeofday(µseconds, (struct timezone*)NULL); |
122 | now.tv_sec = microseconds.tv_sec; |
123 | now.tv_nsec = microseconds.tv_usec*1000; |
124 | #else |
125 | now.tv_sec = time((time_t*)NULL); |
126 | now.tv_nsec = 0; |
127 | #endif |
128 | return (timespec2ntfs(now)); |
129 | } |
130 | |
131 | #endif /* _NTFS_NTFSTIME_H */ |
132 |