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139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/*
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filetime.c
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Conversion of file time and date values to various other types
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2006-07-11 - Chishm
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* Original release
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2006-09-30 - Chishm
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* Validity checks performed on the time supplied by the IPC
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* Cleaned up magic numbers
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2006-10-01 - Chishm
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* Fixed incorrect use of bitwise-or instead of logical-or
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*/
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#include "filetime.h"
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#ifdef NDS
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#include <nds/ipc.h>
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#endif
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#define HOUR_PM_INDICATOR 40
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#define MAX_HOUR 23
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#define MAX_MINUTE 59
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#define MAX_SECOND 59
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#define MAX_YEAR 99
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#define MIN_YEAR 6 // The date is invalid if it's before this year
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#define MAX_MONTH 12
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#define MIN_MONTH 1
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#define MAX_DAY 31
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#define MIN_DAY 1
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// Second values are averages, so time value won't be 100% accurate,
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// but should be within the correct month.
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#define SECONDS_PER_MINUTE 60
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#define SECONDS_PER_HOUR 3600
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#define SECONDS_PER_DAY 86400
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#define SECONDS_PER_MONTH 2629743
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#define SECONDS_PER_YEAR 31556926
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u16 _FAT_filetime_getTimeFromRTC (void) {
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#ifdef NDS
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int hour, minute, second;
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hour = (IPC->rtc_hours >= HOUR_PM_INDICATOR ? IPC->rtc_hours - HOUR_PM_INDICATOR : IPC->rtc_hours);
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minute = IPC->rtc_minutes;
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second = IPC->rtc_seconds;
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// Check that the values are all in range.
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// If they are not, return 0 (no timestamp)
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if ((hour < 0) || (hour > MAX_HOUR)) return 0;
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if ((minute < 0) || (minute > MAX_MINUTE)) return 0;
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if ((second < 0) || (second > MAX_SECOND)) return 0;
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return (
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((hour & 0x1F) << 11) |
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((minute & 0x3F) << 5) |
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((second >> 1) & 0x1F)
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);
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#else
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return 0;
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#endif
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}
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u16 _FAT_filetime_getDateFromRTC (void) {
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#ifdef NDS
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int year, month, day;
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year = IPC->rtc_year;
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month = IPC->rtc_month;
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day = IPC->rtc_day;
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if ((year < MIN_YEAR) || (year > MAX_YEAR)) return 0;
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if ((month < MIN_MONTH) || (month > MAX_MONTH)) return 0;
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if ((day < MIN_DAY) || (day > MAX_DAY)) return 0;
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return (
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(((year + 20) & 0x7F) <<9) | // Adjust for MS-FAT base year (1980 vs 2000 for DS clock)
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((month & 0xF) << 5) |
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(day & 0x1F)
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);
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#else
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return 0;
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#endif
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}
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time_t _FAT_filetime_to_time_t (u16 time, u16 date) {
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int hour, minute, second;
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int day, month, year;
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time_t result;
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hour = time >> 11;
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minute = (time >> 5) & 0x3F;
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second = (time & 0x1F) << 1;
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day = date & 0x1F;
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month = (date >> 5) & 0x0F;
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year = date >> 9;
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// Second values are averages, so time value won't be 100% accurate,
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// but should be within the correct month.
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result = second
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+ minute * SECONDS_PER_MINUTE
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+ hour * SECONDS_PER_HOUR
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+ day * SECONDS_PER_DAY
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+ month * SECONDS_PER_MONTH
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+ year * SECONDS_PER_YEAR
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;
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return result;
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}
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