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 */ 99