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1// SPDX-License-Identifier: LGPL-2.0+
2/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Paul Eggert (eggert@twinsun.com). */
5
6/*
7 * dgb 10/02/98: ripped this from glibc source to help convert timestamps
8 * to unix time
9 * 10/04/98: added new table-based lookup after seeing how ugly
10 * the gnu code is
11 * blf 09/27/99: ripped out all the old code and inserted new table from
12 * John Brockmeyer (without leap second corrections)
13 * rewrote udf_stamp_to_time and fixed timezone accounting in
14 * udf_time_to_stamp.
15 */
16
17/*
18 * We don't take into account leap seconds. This may be correct or incorrect.
19 * For more NIST information (especially dealing with leap seconds), see:
20 * http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
21 */
22
23#include "udfdecl.h"
24
25#include <linux/types.h>
26#include <linux/kernel.h>
27#include <linux/time.h>
28
29void
30udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src)
31{
32 u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
33 u16 year = le16_to_cpu(src.year);
34 uint8_t type = typeAndTimezone >> 12;
35 int16_t offset;
36
37 if (type == 1) {
38 offset = typeAndTimezone << 4;
39 /* sign extent offset */
40 offset = (offset >> 4);
41 if (offset == -2047) /* unspecified offset */
42 offset = 0;
43 } else
44 offset = 0;
45
46 dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute,
47 src.second);
48 dest->tv_sec -= offset * 60;
49
50 /*
51 * Sanitize nanosecond field since reportedly some filesystems are
52 * recorded with bogus sub-second values.
53 */
54 if (src.centiseconds < 100 && src.hundredsOfMicroseconds < 100 &&
55 src.microseconds < 100) {
56 dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
57 src.hundredsOfMicroseconds * 100 + src.microseconds);
58 } else {
59 dest->tv_nsec = 0;
60 }
61}
62
63void
64udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts)
65{
66 time64_t seconds;
67 int16_t offset;
68 struct tm tm;
69
70 offset = -sys_tz.tz_minuteswest;
71
72 dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
73
74 seconds = ts.tv_sec + offset * 60;
75 time64_to_tm(seconds, 0, &tm);
76 dest->year = cpu_to_le16(tm.tm_year + 1900);
77 dest->month = tm.tm_mon + 1;
78 dest->day = tm.tm_mday;
79 dest->hour = tm.tm_hour;
80 dest->minute = tm.tm_min;
81 dest->second = tm.tm_sec;
82 dest->centiseconds = ts.tv_nsec / 10000000;
83 dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
84 dest->centiseconds * 10000) / 100;
85 dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
86 dest->hundredsOfMicroseconds * 100);
87}
88
89/* EOF */
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 <linux/types.h>
38#include <linux/kernel.h>
39#include "udfdecl.h"
40
41#define EPOCH_YEAR 1970
42
43#ifndef __isleap
44/* Nonzero if YEAR is a leap year (every 4 years,
45 except every 100th isn't, and every 400th is). */
46#define __isleap(year) \
47 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
48#endif
49
50/* How many days come before each month (0-12). */
51static const unsigned short int __mon_yday[2][13] = {
52 /* Normal years. */
53 {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
54 /* Leap years. */
55 {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
56};
57
58#define MAX_YEAR_SECONDS 69
59#define SPD 0x15180 /*3600*24 */
60#define SPY(y, l, s) (SPD * (365 * y + l) + s)
61
62static time_t year_seconds[MAX_YEAR_SECONDS] = {
63/*1970*/ SPY(0, 0, 0), SPY(1, 0, 0), SPY(2, 0, 0), SPY(3, 1, 0),
64/*1974*/ SPY(4, 1, 0), SPY(5, 1, 0), SPY(6, 1, 0), SPY(7, 2, 0),
65/*1978*/ SPY(8, 2, 0), SPY(9, 2, 0), SPY(10, 2, 0), SPY(11, 3, 0),
66/*1982*/ SPY(12, 3, 0), SPY(13, 3, 0), SPY(14, 3, 0), SPY(15, 4, 0),
67/*1986*/ SPY(16, 4, 0), SPY(17, 4, 0), SPY(18, 4, 0), SPY(19, 5, 0),
68/*1990*/ SPY(20, 5, 0), SPY(21, 5, 0), SPY(22, 5, 0), SPY(23, 6, 0),
69/*1994*/ SPY(24, 6, 0), SPY(25, 6, 0), SPY(26, 6, 0), SPY(27, 7, 0),
70/*1998*/ SPY(28, 7, 0), SPY(29, 7, 0), SPY(30, 7, 0), SPY(31, 8, 0),
71/*2002*/ SPY(32, 8, 0), SPY(33, 8, 0), SPY(34, 8, 0), SPY(35, 9, 0),
72/*2006*/ SPY(36, 9, 0), SPY(37, 9, 0), SPY(38, 9, 0), SPY(39, 10, 0),
73/*2010*/ SPY(40, 10, 0), SPY(41, 10, 0), SPY(42, 10, 0), SPY(43, 11, 0),
74/*2014*/ SPY(44, 11, 0), SPY(45, 11, 0), SPY(46, 11, 0), SPY(47, 12, 0),
75/*2018*/ SPY(48, 12, 0), SPY(49, 12, 0), SPY(50, 12, 0), SPY(51, 13, 0),
76/*2022*/ SPY(52, 13, 0), SPY(53, 13, 0), SPY(54, 13, 0), SPY(55, 14, 0),
77/*2026*/ SPY(56, 14, 0), SPY(57, 14, 0), SPY(58, 14, 0), SPY(59, 15, 0),
78/*2030*/ SPY(60, 15, 0), SPY(61, 15, 0), SPY(62, 15, 0), SPY(63, 16, 0),
79/*2034*/ SPY(64, 16, 0), SPY(65, 16, 0), SPY(66, 16, 0), SPY(67, 17, 0),
80/*2038*/ SPY(68, 17, 0)
81};
82
83extern struct timezone sys_tz;
84
85#define SECS_PER_HOUR (60 * 60)
86#define SECS_PER_DAY (SECS_PER_HOUR * 24)
87
88struct timespec *
89udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src)
90{
91 int yday;
92 u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
93 u16 year = le16_to_cpu(src.year);
94 uint8_t type = typeAndTimezone >> 12;
95 int16_t offset;
96
97 if (type == 1) {
98 offset = typeAndTimezone << 4;
99 /* sign extent offset */
100 offset = (offset >> 4);
101 if (offset == -2047) /* unspecified offset */
102 offset = 0;
103 } else
104 offset = 0;
105
106 if ((year < EPOCH_YEAR) ||
107 (year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) {
108 return NULL;
109 }
110 dest->tv_sec = year_seconds[year - EPOCH_YEAR];
111 dest->tv_sec -= offset * 60;
112
113 yday = ((__mon_yday[__isleap(year)][src.month - 1]) + src.day - 1);
114 dest->tv_sec += (((yday * 24) + src.hour) * 60 + src.minute) * 60 + src.second;
115 dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
116 src.hundredsOfMicroseconds * 100 + src.microseconds);
117 return dest;
118}
119
120struct timestamp *
121udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts)
122{
123 long int days, rem, y;
124 const unsigned short int *ip;
125 int16_t offset;
126
127 offset = -sys_tz.tz_minuteswest;
128
129 if (!dest)
130 return NULL;
131
132 dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
133
134 ts.tv_sec += offset * 60;
135 days = ts.tv_sec / SECS_PER_DAY;
136 rem = ts.tv_sec % SECS_PER_DAY;
137 dest->hour = rem / SECS_PER_HOUR;
138 rem %= SECS_PER_HOUR;
139 dest->minute = rem / 60;
140 dest->second = rem % 60;
141 y = 1970;
142
143#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
144#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
145
146 while (days < 0 || days >= (__isleap(y) ? 366 : 365)) {
147 long int yg = y + days / 365 - (days % 365 < 0);
148
149 /* Adjust DAYS and Y to match the guessed year. */
150 days -= ((yg - y) * 365
151 + LEAPS_THRU_END_OF(yg - 1)
152 - LEAPS_THRU_END_OF(y - 1));
153 y = yg;
154 }
155 dest->year = cpu_to_le16(y);
156 ip = __mon_yday[__isleap(y)];
157 for (y = 11; days < (long int)ip[y]; --y)
158 continue;
159 days -= ip[y];
160 dest->month = y + 1;
161 dest->day = days + 1;
162
163 dest->centiseconds = ts.tv_nsec / 10000000;
164 dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
165 dest->centiseconds * 10000) / 100;
166 dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
167 dest->hundredsOfMicroseconds * 100);
168 return dest;
169}
170
171/* EOF */