[CIFS] Legacy time handling for Win9x and OS/2 part 1

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index ce87550e918f..fa5124d9af19 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -909,3 +909,54 @@ cifs_UnixTimeToNT(struct timespec t)
         /* Convert to 100ns intervals and then add the NTFS time offset. */
         return (u64) t.tv_sec * 10000000 + t.tv_nsec/100 + NTFS_TIME_OFFSET;
 }
+
+static int total_days_of_prev_months[] =
+{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+
+
+__le64 cnvrtDosCifsTm(__u16 date, __u16 time)
+{
+        return cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(date, time)));
+}
+struct timespec cnvrtDosUnixTm(__u16 date, __u16 time)
+{
+        __u8  dt[2];
+        __u8  tm[2];
+        struct timespec ts;
+        int sec,min, days, month, year;
+        struct timespec removeme; /* BB removeme BB */
+/*      SMB_TIME * st = (SMB_TIME *)&time;*/
+
+        cFYI(1,("date %d time %d",date, time));
+
+        dt[0] = date & 0xFF;
+        dt[1] = (date & 0xFF00) >> 8;
+        tm[0] = time & 0xFF;
+        tm[1] = (time & 0xFF00) >> 8;
+
+        sec = tm[0] & 0x1F;
+        sec = 2 * sec;
+        min = ((tm[0] >>5)&0xFF) + ((tm[1] & 0x7)<<3);
+
+        sec += (min * 60);
+        sec += 60 * 60 * ((tm[1] >> 3) &0xFF) /* hours */;
+        days = (dt[0] & 0x1F) - 1;
+        month = ((dt[0] >> 5) & 0xFF) + ((dt[1] & 0x1) <<3);
+        if(month > 12)
+                cERROR(1,("illegal month %d in date", month));
+        month -= 1;
+        days += total_days_of_prev_months[month];
+        days += 3653; /* account for difference in days between 1980 and 1970 */
+        year = (dt[1]>>1) & 0xFF;
+        days += year * 365;
+        days += (year/4); /* leap year */
+        /* adjust for leap year where we are still before leap day */
+        days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
+        sec += 24 * 60 * 60 * days; 
+
+        removeme = CURRENT_TIME; /* BB removeme BB */
+        ts.tv_sec = sec;
+
+        ts.tv_nsec = 0;
+        return ts;
+}