// 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> voidudf_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; 	/*	 * Sanitize nanosecond field since reportedly some filesystems are	 * recorded with bogus sub-second values.	 */	if (src.centiseconds < 100 && src.hundredsOfMicroseconds < 100 &&	    src.microseconds < 100) {		dest->tv_nsec = 1000 * (src.centiseconds * 10000 +			src.hundredsOfMicroseconds * 100 + src.microseconds);	} else {		dest->tv_nsec = 0;	}} voidudf_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 */