173 lines
5.8 KiB
C
173 lines
5.8 KiB
C
/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Eggert (eggert@twinsun.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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* dgb 10/02/98: ripped this from glibc source to help convert timestamps
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* to unix time
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* 10/04/98: added new table-based lookup after seeing how ugly
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* the gnu code is
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* blf 09/27/99: ripped out all the old code and inserted new table from
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* John Brockmeyer (without leap second corrections)
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* rewrote udf_stamp_to_time and fixed timezone accounting in
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* udf_time_to_stamp.
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*/
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/*
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* We don't take into account leap seconds. This may be correct or incorrect.
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* For more NIST information (especially dealing with leap seconds), see:
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* http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
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*/
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#include "udfdecl.h"
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#include <linux/types.h>
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#include <linux/kernel.h>
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#define EPOCH_YEAR 1970
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#ifndef __isleap
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/* Nonzero if YEAR is a leap year (every 4 years,
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except every 100th isn't, and every 400th is). */
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#define __isleap(year) \
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((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
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#endif
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/* How many days come before each month (0-12). */
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static const unsigned short int __mon_yday[2][13] = {
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/* Normal years. */
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{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
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/* Leap years. */
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{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
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};
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#define MAX_YEAR_SECONDS 69
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#define SPD 0x15180 /*3600*24 */
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#define SPY(y, l, s) (SPD * (365 * y + l) + s)
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static time_t year_seconds[MAX_YEAR_SECONDS] = {
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/*1970*/ SPY(0, 0, 0), SPY(1, 0, 0), SPY(2, 0, 0), SPY(3, 1, 0),
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/*1974*/ SPY(4, 1, 0), SPY(5, 1, 0), SPY(6, 1, 0), SPY(7, 2, 0),
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/*1978*/ SPY(8, 2, 0), SPY(9, 2, 0), SPY(10, 2, 0), SPY(11, 3, 0),
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/*1982*/ SPY(12, 3, 0), SPY(13, 3, 0), SPY(14, 3, 0), SPY(15, 4, 0),
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/*1986*/ SPY(16, 4, 0), SPY(17, 4, 0), SPY(18, 4, 0), SPY(19, 5, 0),
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/*1990*/ SPY(20, 5, 0), SPY(21, 5, 0), SPY(22, 5, 0), SPY(23, 6, 0),
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/*1994*/ SPY(24, 6, 0), SPY(25, 6, 0), SPY(26, 6, 0), SPY(27, 7, 0),
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/*1998*/ SPY(28, 7, 0), SPY(29, 7, 0), SPY(30, 7, 0), SPY(31, 8, 0),
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/*2002*/ SPY(32, 8, 0), SPY(33, 8, 0), SPY(34, 8, 0), SPY(35, 9, 0),
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/*2006*/ SPY(36, 9, 0), SPY(37, 9, 0), SPY(38, 9, 0), SPY(39, 10, 0),
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/*2010*/ SPY(40, 10, 0), SPY(41, 10, 0), SPY(42, 10, 0), SPY(43, 11, 0),
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/*2014*/ SPY(44, 11, 0), SPY(45, 11, 0), SPY(46, 11, 0), SPY(47, 12, 0),
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/*2018*/ SPY(48, 12, 0), SPY(49, 12, 0), SPY(50, 12, 0), SPY(51, 13, 0),
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/*2022*/ SPY(52, 13, 0), SPY(53, 13, 0), SPY(54, 13, 0), SPY(55, 14, 0),
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/*2026*/ SPY(56, 14, 0), SPY(57, 14, 0), SPY(58, 14, 0), SPY(59, 15, 0),
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/*2030*/ SPY(60, 15, 0), SPY(61, 15, 0), SPY(62, 15, 0), SPY(63, 16, 0),
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/*2034*/ SPY(64, 16, 0), SPY(65, 16, 0), SPY(66, 16, 0), SPY(67, 17, 0),
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/*2038*/ SPY(68, 17, 0)
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};
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extern struct timezone sys_tz;
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#define SECS_PER_HOUR (60 * 60)
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#define SECS_PER_DAY (SECS_PER_HOUR * 24)
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struct timespec *
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udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src)
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{
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int yday;
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u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
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u16 year = le16_to_cpu(src.year);
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uint8_t type = typeAndTimezone >> 12;
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int16_t offset;
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if (type == 1) {
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offset = typeAndTimezone << 4;
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/* sign extent offset */
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offset = (offset >> 4);
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if (offset == -2047) /* unspecified offset */
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offset = 0;
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} else
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offset = 0;
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if ((year < EPOCH_YEAR) ||
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(year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) {
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return NULL;
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}
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dest->tv_sec = year_seconds[year - EPOCH_YEAR];
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dest->tv_sec -= offset * 60;
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yday = ((__mon_yday[__isleap(year)][src.month - 1]) + src.day - 1);
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dest->tv_sec += (((yday * 24) + src.hour) * 60 + src.minute) * 60 + src.second;
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dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
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src.hundredsOfMicroseconds * 100 + src.microseconds);
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return dest;
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}
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struct timestamp *
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udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts)
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{
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long int days, rem, y;
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const unsigned short int *ip;
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int16_t offset;
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offset = -sys_tz.tz_minuteswest;
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if (!dest)
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return NULL;
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dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
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ts.tv_sec += offset * 60;
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days = ts.tv_sec / SECS_PER_DAY;
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rem = ts.tv_sec % SECS_PER_DAY;
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dest->hour = rem / SECS_PER_HOUR;
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rem %= SECS_PER_HOUR;
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dest->minute = rem / 60;
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dest->second = rem % 60;
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y = 1970;
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#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
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#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
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while (days < 0 || days >= (__isleap(y) ? 366 : 365)) {
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long int yg = y + days / 365 - (days % 365 < 0);
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/* Adjust DAYS and Y to match the guessed year. */
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days -= ((yg - y) * 365
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+ LEAPS_THRU_END_OF(yg - 1)
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- LEAPS_THRU_END_OF(y - 1));
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y = yg;
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}
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dest->year = cpu_to_le16(y);
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ip = __mon_yday[__isleap(y)];
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for (y = 11; days < (long int)ip[y]; --y)
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continue;
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days -= ip[y];
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dest->month = y + 1;
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dest->day = days + 1;
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dest->centiseconds = ts.tv_nsec / 10000000;
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dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
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dest->centiseconds * 10000) / 100;
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dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
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dest->hundredsOfMicroseconds * 100);
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return dest;
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}
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/* EOF */
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