1 /* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Paul Eggert (eggert@twinsun.com).
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
19
20 /*
21 * dgb 10/02/98: ripped this from glibc source to help convert timestamps
22 * to unix time
23 * 10/04/98: added new table-based lookup after seeing how ugly
24 * the gnu code is
25 * blf 09/27/99: ripped out all the old code and inserted new table from
26 * John Brockmeyer (without leap second corrections)
27 * rewrote udf_stamp_to_time and fixed timezone accounting in
28 * udf_time_to_stamp.
29 */
30
31 /*
32 * We don't take into account leap seconds. This may be correct or incorrect.
33 * For more NIST information (especially dealing with leap seconds), see:
34 * http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
35 */
36
37 #include "udfdecl.h"
38
39 #include <linux/types.h>
40 #include <linux/kernel.h>
41 #include <linux/time.h>
42
43 void
44 udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src)
45 {
46 u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
47 u16 year = le16_to_cpu(src.year);
48 uint8_t type = typeAndTimezone >> 12;
49 int16_t offset;
50
51 if (type == 1) {
52 offset = typeAndTimezone << 4;
53 /* sign extent offset */
54 offset = (offset >> 4);
55 if (offset == -2047) /* unspecified offset */
56 offset = 0;
57 } else
58 offset = 0;
59
60 dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute,
61 src.second);
62 dest->tv_sec -= offset * 60;
63 dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
64 src.hundredsOfMicroseconds * 100 + src.microseconds);
65 /*
66 * Sanitize nanosecond field since reportedly some filesystems are
67 * recorded with bogus sub-second values.
68 */
69 dest->tv_nsec %= NSEC_PER_SEC;
70 }
71
72 void
73 udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts)
74 {
75 time64_t seconds;
76 int16_t offset;
77 struct tm tm;
78
79 offset = -sys_tz.tz_minuteswest;
80
81 dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
82
83 seconds = ts.tv_sec + offset * 60;
84 time64_to_tm(seconds, 0, &tm);
85 dest->year = cpu_to_le16(tm.tm_year + 1900);
86 dest->month = tm.tm_mon + 1;
87 dest->day = tm.tm_mday;
88 dest->hour = tm.tm_hour;
89 dest->minute = tm.tm_min;
90 dest->second = tm.tm_sec;
91 dest->centiseconds = ts.tv_nsec / 10000000;
92 dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
93 dest->centiseconds * 10000) / 100;
94 dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
95 dest->hundredsOfMicroseconds * 100);
96 }
97
98 /* EOF */