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// SPDX-License-Identifier: LGPL-2.0+
/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Eggert (eggert@twinsun.com). */
/*
* dgb 10/02/98: ripped this from glibc source to help convert timestamps
* to unix time
* 10/04/98: added new table-based lookup after seeing how ugly
* the gnu code is
* blf 09/27/99: ripped out all the old code and inserted new table from
* John Brockmeyer (without leap second corrections)
* rewrote udf_stamp_to_time and fixed timezone accounting in
* udf_time_to_stamp.
*/
/*
* We don't take into account leap seconds. This may be correct or incorrect.
* For more NIST information (especially dealing with leap seconds), see:
* http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
*/
#include "udfdecl.h"
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
void
udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src)
{
u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
u16 year = le16_to_cpu(src.year);
uint8_t type = typeAndTimezone >> 12;
int16_t offset;
if (type == 1) {
offset = typeAndTimezone << 4;
/* sign extent offset */
offset = (offset >> 4);
if (offset == -2047) /* unspecified offset */
offset = 0;
} else
offset = 0;
dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute,
src.second);
dest->tv_sec -= offset * 60;
dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
src.hundredsOfMicroseconds * 100 + src.microseconds);
/*
* Sanitize nanosecond field since reportedly some filesystems are
* recorded with bogus sub-second values.
*/
dest->tv_nsec %= NSEC_PER_SEC;
}
void
udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts)
{
time64_t seconds;
int16_t offset;
struct tm tm;
offset = -sys_tz.tz_minuteswest;
dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
seconds = ts.tv_sec + offset * 60;
time64_to_tm(seconds, 0, &tm);
dest->year = cpu_to_le16(tm.tm_year + 1900);
dest->month = tm.tm_mon + 1;
dest->day = tm.tm_mday;
dest->hour = tm.tm_hour;
dest->minute = tm.tm_min;
dest->second = tm.tm_sec;
dest->centiseconds = ts.tv_nsec / 10000000;
dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
dest->centiseconds * 10000) / 100;
dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
dest->hundredsOfMicroseconds * 100);
}
/* EOF */
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