11da177e4SLinus Torvalds /* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. 21da177e4SLinus Torvalds This file is part of the GNU C Library. 31da177e4SLinus Torvalds Contributed by Paul Eggert (eggert@twinsun.com). 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds The GNU C Library is free software; you can redistribute it and/or 61da177e4SLinus Torvalds modify it under the terms of the GNU Library General Public License as 71da177e4SLinus Torvalds published by the Free Software Foundation; either version 2 of the 81da177e4SLinus Torvalds License, or (at your option) any later version. 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds The GNU C Library is distributed in the hope that it will be useful, 111da177e4SLinus Torvalds but WITHOUT ANY WARRANTY; without even the implied warranty of 121da177e4SLinus Torvalds MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 131da177e4SLinus Torvalds Library General Public License for more details. 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds You should have received a copy of the GNU Library General Public 161da177e4SLinus Torvalds License along with the GNU C Library; see the file COPYING.LIB. If not, 171da177e4SLinus Torvalds write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 181da177e4SLinus Torvalds Boston, MA 02111-1307, USA. */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds /* 211da177e4SLinus Torvalds * dgb 10/02/98: ripped this from glibc source to help convert timestamps to unix time 221da177e4SLinus Torvalds * 10/04/98: added new table-based lookup after seeing how ugly the gnu code is 231da177e4SLinus Torvalds * blf 09/27/99: ripped out all the old code and inserted new table from 241da177e4SLinus Torvalds * John Brockmeyer (without leap second corrections) 251da177e4SLinus Torvalds * rewrote udf_stamp_to_time and fixed timezone accounting in 2628de7948SCyrill Gorcunov * udf_time_to_stamp. 271da177e4SLinus Torvalds */ 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* 301da177e4SLinus Torvalds * We don't take into account leap seconds. This may be correct or incorrect. 311da177e4SLinus Torvalds * For more NIST information (especially dealing with leap seconds), see: 321da177e4SLinus Torvalds * http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm 331da177e4SLinus Torvalds */ 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include <linux/types.h> 361da177e4SLinus Torvalds #include <linux/kernel.h> 371da177e4SLinus Torvalds #include "udfdecl.h" 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define EPOCH_YEAR 1970 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds #ifndef __isleap 421da177e4SLinus Torvalds /* Nonzero if YEAR is a leap year (every 4 years, 431da177e4SLinus Torvalds except every 100th isn't, and every 400th is). */ 441da177e4SLinus Torvalds #define __isleap(year) \ 451da177e4SLinus Torvalds ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 461da177e4SLinus Torvalds #endif 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* How many days come before each month (0-12). */ 49cb00ea35SCyrill Gorcunov static const unsigned short int __mon_yday[2][13] = { 501da177e4SLinus Torvalds /* Normal years. */ 511da177e4SLinus Torvalds {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}, 521da177e4SLinus Torvalds /* Leap years. */ 531da177e4SLinus Torvalds {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366} 541da177e4SLinus Torvalds }; 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds #define MAX_YEAR_SECONDS 69 571da177e4SLinus Torvalds #define SPD 0x15180 /*3600*24 */ 581da177e4SLinus Torvalds #define SPY(y,l,s) (SPD * (365*y+l)+s) 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds static time_t year_seconds[MAX_YEAR_SECONDS]= { 611da177e4SLinus Torvalds /*1970*/ SPY( 0, 0,0), SPY( 1, 0,0), SPY( 2, 0,0), SPY( 3, 1,0), 621da177e4SLinus Torvalds /*1974*/ SPY( 4, 1,0), SPY( 5, 1,0), SPY( 6, 1,0), SPY( 7, 2,0), 631da177e4SLinus Torvalds /*1978*/ SPY( 8, 2,0), SPY( 9, 2,0), SPY(10, 2,0), SPY(11, 3,0), 641da177e4SLinus Torvalds /*1982*/ SPY(12, 3,0), SPY(13, 3,0), SPY(14, 3,0), SPY(15, 4,0), 651da177e4SLinus Torvalds /*1986*/ SPY(16, 4,0), SPY(17, 4,0), SPY(18, 4,0), SPY(19, 5,0), 661da177e4SLinus Torvalds /*1990*/ SPY(20, 5,0), SPY(21, 5,0), SPY(22, 5,0), SPY(23, 6,0), 671da177e4SLinus Torvalds /*1994*/ SPY(24, 6,0), SPY(25, 6,0), SPY(26, 6,0), SPY(27, 7,0), 681da177e4SLinus Torvalds /*1998*/ SPY(28, 7,0), SPY(29, 7,0), SPY(30, 7,0), SPY(31, 8,0), 691da177e4SLinus Torvalds /*2002*/ SPY(32, 8,0), SPY(33, 8,0), SPY(34, 8,0), SPY(35, 9,0), 701da177e4SLinus Torvalds /*2006*/ SPY(36, 9,0), SPY(37, 9,0), SPY(38, 9,0), SPY(39,10,0), 711da177e4SLinus Torvalds /*2010*/ SPY(40,10,0), SPY(41,10,0), SPY(42,10,0), SPY(43,11,0), 721da177e4SLinus Torvalds /*2014*/ SPY(44,11,0), SPY(45,11,0), SPY(46,11,0), SPY(47,12,0), 731da177e4SLinus Torvalds /*2018*/ SPY(48,12,0), SPY(49,12,0), SPY(50,12,0), SPY(51,13,0), 741da177e4SLinus Torvalds /*2022*/ SPY(52,13,0), SPY(53,13,0), SPY(54,13,0), SPY(55,14,0), 751da177e4SLinus Torvalds /*2026*/ SPY(56,14,0), SPY(57,14,0), SPY(58,14,0), SPY(59,15,0), 761da177e4SLinus Torvalds /*2030*/ SPY(60,15,0), SPY(61,15,0), SPY(62,15,0), SPY(63,16,0), 771da177e4SLinus Torvalds /*2034*/ SPY(64,16,0), SPY(65,16,0), SPY(66,16,0), SPY(67,17,0), 781da177e4SLinus Torvalds /*2038*/ SPY(68,17,0) 791da177e4SLinus Torvalds }; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds extern struct timezone sys_tz; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds #define SECS_PER_HOUR (60 * 60) 841da177e4SLinus Torvalds #define SECS_PER_DAY (SECS_PER_HOUR * 24) 851da177e4SLinus Torvalds 86cb00ea35SCyrill Gorcunov time_t *udf_stamp_to_time(time_t *dest, long *dest_usec, kernel_timestamp src) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds int yday; 891da177e4SLinus Torvalds uint8_t type = src.typeAndTimezone >> 12; 901da177e4SLinus Torvalds int16_t offset; 911da177e4SLinus Torvalds 92cb00ea35SCyrill Gorcunov if (type == 1) { 931da177e4SLinus Torvalds offset = src.typeAndTimezone << 4; 941da177e4SLinus Torvalds /* sign extent offset */ 951da177e4SLinus Torvalds offset = (offset >> 4); 961da177e4SLinus Torvalds if (offset == -2047) /* unspecified offset */ 971da177e4SLinus Torvalds offset = 0; 9828de7948SCyrill Gorcunov } else { 991da177e4SLinus Torvalds offset = 0; 10028de7948SCyrill Gorcunov } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds if ((src.year < EPOCH_YEAR) || 103cb00ea35SCyrill Gorcunov (src.year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) { 1041da177e4SLinus Torvalds *dest = -1; 1051da177e4SLinus Torvalds *dest_usec = -1; 1061da177e4SLinus Torvalds return NULL; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds *dest = year_seconds[src.year - EPOCH_YEAR]; 1091da177e4SLinus Torvalds *dest -= offset * 60; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds yday = ((__mon_yday[__isleap (src.year)] 1121da177e4SLinus Torvalds [src.month - 1]) + (src.day - 1)); 1131da177e4SLinus Torvalds *dest += ( ( (yday * 24) + src.hour ) * 60 + src.minute ) * 60 + src.second; 11428de7948SCyrill Gorcunov *dest_usec = src.centiseconds * 10000 + src.hundredsOfMicroseconds * 100 + src.microseconds; 1151da177e4SLinus Torvalds return dest; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 118cb00ea35SCyrill Gorcunov kernel_timestamp *udf_time_to_stamp(kernel_timestamp * dest, struct timespec ts) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds long int days, rem, y; 1211da177e4SLinus Torvalds const unsigned short int *ip; 1221da177e4SLinus Torvalds int16_t offset; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds offset = -sys_tz.tz_minuteswest; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds if (!dest) 1271da177e4SLinus Torvalds return NULL; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds dest->typeAndTimezone = 0x1000 | (offset & 0x0FFF); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds ts.tv_sec += offset * 60; 1321da177e4SLinus Torvalds days = ts.tv_sec / SECS_PER_DAY; 1331da177e4SLinus Torvalds rem = ts.tv_sec % SECS_PER_DAY; 1341da177e4SLinus Torvalds dest->hour = rem / SECS_PER_HOUR; 1351da177e4SLinus Torvalds rem %= SECS_PER_HOUR; 1361da177e4SLinus Torvalds dest->minute = rem / 60; 1371da177e4SLinus Torvalds dest->second = rem % 60; 1381da177e4SLinus Torvalds y = 1970; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds #define DIV(a,b) ((a) / (b) - ((a) % (b) < 0)) 1411da177e4SLinus Torvalds #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 1421da177e4SLinus Torvalds 143cb00ea35SCyrill Gorcunov while (days < 0 || days >= (__isleap(y) ? 366 : 365)) { 1441da177e4SLinus Torvalds long int yg = y + days / 365 - (days % 365 < 0); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* Adjust DAYS and Y to match the guessed year. */ 14728de7948SCyrill Gorcunov days -= ((yg - y) * 365 14828de7948SCyrill Gorcunov + LEAPS_THRU_END_OF (yg - 1) 1491da177e4SLinus Torvalds - LEAPS_THRU_END_OF (y - 1)); 1501da177e4SLinus Torvalds y = yg; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds dest->year = y; 1531da177e4SLinus Torvalds ip = __mon_yday[__isleap(y)]; 1541da177e4SLinus Torvalds for (y = 11; days < (long int)ip[y]; --y) 1551da177e4SLinus Torvalds continue; 1561da177e4SLinus Torvalds days -= ip[y]; 1571da177e4SLinus Torvalds dest->month = y + 1; 1581da177e4SLinus Torvalds dest->day = days + 1; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds dest->centiseconds = ts.tv_nsec / 10000000; 16128de7948SCyrill Gorcunov dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000) / 100; 16228de7948SCyrill Gorcunov dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 - 1631da177e4SLinus Torvalds dest->hundredsOfMicroseconds * 100); 1641da177e4SLinus Torvalds return dest; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* EOF */ 168