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diff --git a/sdk-modifications/libsrc/fs/filetime.c b/sdk-modifications/libsrc/fs/filetime.c
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+/*
+ filetime.c
+ Conversion of file time and date values to various other types
+
+ Copyright (c) 2006 Michael "Chishm" Chisholm
+
+ Redistribution and use in source and binary forms, with or without modification,
+ are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+ 3. The name of the author may not be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ 2006-07-11 - Chishm
+ * Original release
+
+ 2006-09-30 - Chishm
+ * Validity checks performed on the time supplied by the IPC
+ * Cleaned up magic numbers
+
+ 2006-10-01 - Chishm
+ * Fixed incorrect use of bitwise-or instead of logical-or
+*/
+
+
+#include "filetime.h"
+
+#ifdef NDS
+//#include <nds/ipc.h>
+#include "ds2io.h"
+#endif
+
+#define HOUR_PM_INDICATOR 40
+
+#define MAX_HOUR 23
+#define MAX_MINUTE 59
+#define MAX_SECOND 59
+
+#define MAX_YEAR 99
+#define MIN_YEAR 6 // The date is invalid if it's before this year
+#define MAX_MONTH 12
+#define MIN_MONTH 1
+#define MAX_DAY 31
+#define MIN_DAY 1
+
+// Second values are averages, so time value won't be 100% accurate,
+// but should be within the correct month.
+#define SECONDS_PER_MINUTE 60
+#define SECONDS_PER_HOUR 3600
+#define SECONDS_PER_DAY 86400
+#define SECONDS_PER_MONTH 2629743
+#define SECONDS_PER_YEAR 31556926
+
+u16 _FAT_filetime_getTimeFromRTC (void) {
+#ifdef NDS
+ int hour, minute, second;
+ struct rtc time;
+
+ ds2_getTime(&time);
+
+ hour = (time.hours >= HOUR_PM_INDICATOR ? time.hours - HOUR_PM_INDICATOR : time.hours);
+ minute = time.minutes;
+ second = time.seconds;
+
+ // Check that the values are all in range.
+ // If they are not, return 0 (no timestamp)
+ if ((hour < 0) || (hour > MAX_HOUR)) return 0;
+ if ((minute < 0) || (minute > MAX_MINUTE)) return 0;
+ if ((second < 0) || (second > MAX_SECOND)) return 0;
+
+ return (
+ ((hour & 0x1F) << 11) |
+ ((minute & 0x3F) << 5) |
+ ((second >> 1) & 0x1F)
+ );
+#else
+ return 0;
+#endif
+}
+
+
+u16 _FAT_filetime_getDateFromRTC (void) {
+#ifdef NDS
+ int year, month, day;
+ struct rtc time;
+
+ ds2_getTime(&time);
+
+ year = time.year;
+ month = time.month;
+ day = time.day;
+
+ if ((year < MIN_YEAR) || (year > MAX_YEAR)) return 0;
+ if ((month < MIN_MONTH) || (month > MAX_MONTH)) return 0;
+ if ((day < MIN_DAY) || (day > MAX_DAY)) return 0;
+
+ return (
+ (((year + 20) & 0x7F) <<9) | // Adjust for MS-FAT base year (1980 vs 2000 for DS clock)
+ ((month & 0xF) << 5) |
+ (day & 0x1F)
+ );
+#else
+ return 0;
+#endif
+}
+
+time_t _FAT_filetime_to_time_t (u16 time, u16 date) {
+ int hour, minute, second;
+ int day, month, year;
+
+ time_t result;
+
+ hour = time >> 11;
+ minute = (time >> 5) & 0x3F;
+ second = (time & 0x1F) << 1;
+
+ day = date & 0x1F;
+ month = (date >> 5) & 0x0F;
+ year = date >> 9;
+
+ // Second values are averages, so time value won't be 100% accurate,
+ // but should be within the correct month.
+ result = second
+ + minute * SECONDS_PER_MINUTE
+ + hour * SECONDS_PER_HOUR
+ + day * SECONDS_PER_DAY
+ + month * SECONDS_PER_MONTH
+ + year * SECONDS_PER_YEAR
+ ;
+
+ return result;
+}