1 files changed, 146 insertions, 0 deletions
diff --git a/sdk-modifications/libsrc/fs/filetime.c b/sdk-modifications/libsrc/fs/filetime.c
new file mode 100644
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+++ b/sdk-modifications/libsrc/fs/filetime.c
@@ -0,0 +1,146 @@
+/*
+ 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;
+}