mirror of https://github.com/pbatard/rufus.git
255 lines
7.6 KiB
C
255 lines
7.6 KiB
C
/*
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Copyright (C) 2005, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
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Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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Modified From part of the GNU C Library.
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Contributed by Paul Eggert.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Some history from the GNU/Linux kernel from which this is also taken...
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dgb 10/02/98: ripped this from glibc source to help convert
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timestamps to unix time
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10/04/98: added new table-based lookup after seeing how ugly the
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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
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accounting in udf_timespec_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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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# define __CDIO_CONFIG_H__ 1
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#endif
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#ifdef NEED_TIMEZONEVAR
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#define timezonevar 1
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#endif
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#include "udf_private.h"
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#include <cdio/udf.h>
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/**
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Imagine the below enum values as #define'd or constant values
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rather than distinct values of an enum.
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*/
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enum {
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HOURS_PER_DAY = 24,
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SECS_PER_MINUTE = 60,
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MAX_YEAR_SECONDS = 69,
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DAYS_PER_YEAR = 365, /* That is, in most of the years. */
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EPOCH_YEAR = 1970,
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SECS_PER_HOUR = (60 * SECS_PER_MINUTE),
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SECS_PER_DAY = SECS_PER_HOUR * HOURS_PER_DAY
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} debug_udf_time_enum;
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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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{
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/* Normal years. */
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, DAYS_PER_YEAR },
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/* Leap years. */
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{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, DAYS_PER_YEAR+1 }
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};
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#define SPY(y,l,s) (SECS_PER_DAY * (DAYS_PER_YEAR*y+l)+s) /* Seconds per year */
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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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#if defined(HAVE_TIMEZONE_VAR) && !defined(_WIN32)
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extern long timezone;
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#endif
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time_t *
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udf_stamp_to_time(time_t *dest, long int *dest_usec,
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const udf_timestamp_t src)
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{
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int yday;
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uint8_t type = src.type_tz >> 12;
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int16_t offset;
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if (type == 1) {
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offset = src.type_tz << 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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}
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else
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offset = 0;
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if ((src.year < EPOCH_YEAR) ||
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(src.year >= EPOCH_YEAR+MAX_YEAR_SECONDS))
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{
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*dest = -1;
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*dest_usec = -1;
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return NULL;
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}
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*dest = year_seconds[src.year - EPOCH_YEAR];
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*dest -= offset * SECS_PER_MINUTE;
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yday = ((__mon_yday[__isleap (src.year)]
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[src.month-1]) + (src.day-1));
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*dest += src.second +
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( SECS_PER_MINUTE *
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( ( (yday* HOURS_PER_DAY) + src.hour ) * 60 + src.minute ) );
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*dest_usec = src.microseconds
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+ (src.centiseconds * 10000)
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+ (src.hundreds_of_microseconds * 100);
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return dest;
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}
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#ifdef HAVE_STRUCT_TIMESPEC
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/*!
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Convert a UDF timestamp to a time_t. If microseconds are desired,
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use dest_usec. The return value is the same as dest. */
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udf_timestamp_t *
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udf_timespec_to_stamp(const struct timespec ts, udf_timestamp_t *dest)
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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 = 0;
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int16_t tv_sec;
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#ifdef HAVE_TIMEZONE_VAR
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offset = -timezone;
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#endif
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if (!dest)
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return dest;
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dest->type_tz = 0x1000 | (offset & 0x0FFF);
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tv_sec = ts.tv_sec + (offset * SECS_PER_MINUTE);
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days = tv_sec / SECS_PER_DAY;
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rem = 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 / SECS_PER_MINUTE;
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dest->second = rem % SECS_PER_MINUTE;
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y = EPOCH_YEAR;
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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) ? DAYS_PER_YEAR+1 : DAYS_PER_YEAR)) {
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long int yg = y + days / DAYS_PER_YEAR - (days % DAYS_PER_YEAR < 0);
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/* Adjust DAYS and Y to match the guessed year. */
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days -= ((yg - y) * DAYS_PER_YEAR
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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 = 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->hundreds_of_microseconds = ( (ts.tv_nsec / 1000)
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- (dest->centiseconds * 10000) ) / 100;
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dest->microseconds = ( (ts.tv_nsec / 1000)
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- (dest->centiseconds * 10000)
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- (dest->hundreds_of_microseconds * 100) );
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return dest;
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}
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#endif
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/*!
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Return the modification time of the file.
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*/
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time_t
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udf_get_modification_time(const udf_dirent_t *p_udf_dirent)
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{
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if (p_udf_dirent) {
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time_t ret_time;
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long int usec;
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udf_stamp_to_time(&ret_time, &usec, p_udf_dirent->fe.modification_time);
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return ret_time;
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}
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return 0;
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}
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/*!
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Return the access time of the file.
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*/
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time_t
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udf_get_access_time(const udf_dirent_t *p_udf_dirent)
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{
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if (p_udf_dirent) {
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time_t ret_time;
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long int usec;
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udf_stamp_to_time(&ret_time, &usec, p_udf_dirent->fe.access_time);
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return ret_time;
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}
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return 0;
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}
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/*!
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Return the attribute (most recent create or access) time of the file
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*/
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time_t
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udf_get_attribute_time(const udf_dirent_t *p_udf_dirent)
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{
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if (p_udf_dirent) {
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time_t ret_time;
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long int usec;
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udf_stamp_to_time(&ret_time, &usec, p_udf_dirent->fe.attribute_time);
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return ret_time;
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}
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return 0;
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}
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