conversion to/from DOS date/time (patch 627575)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17709 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/datetime.tex

@@ -235,6 +235,7 @@ values were correct as constructors can not return an error code.
 \helpref{Set(double jdn)}{wxdatetimesetjdn}\\
 \helpref{Set(h, m, s, ms)}{wxdatetimesettime}\\
 \helpref{Set(day, mon, year, h, m, s, ms)}{wxdatetimesetdate}\\
+\helpref{SetFromDOS(unsigned long ddt)}{wxdatetimesetfromdos}\\
 \helpref{ResetTime}{wxdatetimeresettime}\\
 \helpref{SetYear}{wxdatetimesetyear}\\
 \helpref{SetMonth}{wxdatetimesetmonth}\\
@@ -268,7 +269,8 @@ some more complicated calculations to find the answer are under the
 \helpref{GetWeekOfMonth}{wxdatetimegetweekofmonth}\\
 \helpref{GetYearDay}{wxdatetimegetyearday}\\
 \helpref{IsWorkDay}{wxdatetimeisworkday}\\
-\helpref{IsGregorianDate}{wxdatetimeisgregoriandate}
+\helpref{IsGregorianDate}{wxdatetimeisgregoriandate}\\
+\helpref{GetAsDOS}{wxdatetimegetasdos}
 
 \membersection{Date comparison}
 
@@ -882,6 +884,24 @@ Returns {\tt TRUE} if the given date os later than the date of adoption of the
 Gregorian calendar in the given country (and hence the Gregorian calendar
 calculations make sense for it).
 
+%%%%%%%%%%%%%%%%%%%%%% dos date and time format %%%%%%%%%%%%%%%%%%%%%%%
+
+\membersection{wxDateTime::SetFromDOS}\label{wxdatetimesetfromdos}
+
+\func{wxDateTime\&}{Set}{\param{unsigned long }{ddt}}
+
+Sets the date from the date and time in 
+\urlref{DOS}{http://developer.novell.com/ndk/doc/smscomp/index.html?page=/ndk/doc/smscomp/sms\_docs/data/hc2vlu5i.html} 
+format.
+
+\membersection{wxDateTime::GetAsDOS}\label{wxdatetimegetasdos}
+
+\constfunc{unsigned long}{GetAsDOS}{\void}
+
+Returns the date and time in 
+\urlref{DOS}{http://developer.novell.com/ndk/doc/smscomp/index.html?page=/ndk/doc/smscomp/sms\_docs/data/hc2vlu5i.html} 
+format.
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%% comparison %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 \membersection{wxDateTime::IsEqualTo}\label{wxdatetimeisequalto}

include/wx/datetime.h

@@ -851,6 +851,15 @@ public:
         //     adoption of the Gregorian calendar is simply unknown.
     bool IsGregorianDate(GregorianAdoption country = Gr_Standard) const;
 
+    // dos date and time format
+    // ------------------------------------------------------------------------
+
+        // set from the DOS packed format
+    wxDateTime& SetFromDOS(unsigned long ddt);
+
+        // pack the date in DOS format
+    unsigned long GetAsDOS() const;
+
     // comparison (see also functions below for operator versions)
     // ------------------------------------------------------------------------
 

src/common/datetime.cpp

@@ -1247,6 +1247,82 @@ wxDateTime& wxDateTime::ResetTime()
     return *this;
 }
 
+// ----------------------------------------------------------------------------
+// DOS Date and Time Format functions
+// ----------------------------------------------------------------------------
+// the dos date and time value is an unsigned 32 bit value in the format:
+// YYYYYYYMMMMDDDDDhhhhhmmmmmmsssss
+//
+// Y = year offset from 1980 (0-127)
+// M = month (1-12)
+// D = day of month (1-31)
+// h = hour (0-23)
+// m = minute (0-59)
+// s = bisecond (0-29) each bisecond indicates two seconds
+// ----------------------------------------------------------------------------
+
+wxDateTime& wxDateTime::SetFromDOS(unsigned long ddt)
+{
+    struct tm tm;
+
+    long year = ddt & 0xFE000000;
+    year >>= 25;
+    year += 80;
+    tm.tm_year = year;
+
+    long month = ddt & 0x1E00000;
+    month >>= 21;
+    month -= 1;
+    tm.tm_mon = month;
+
+    long day = ddt & 0x1F0000;
+    day >>= 16;
+    tm.tm_mday = day;
+
+    long hour = ddt & 0xF800;
+    hour >>= 11;
+    tm.tm_hour = hour;
+
+    long minute = ddt & 0x7E0;
+    minute >>= 5;
+    tm.tm_min = minute;
+
+    long second = ddt & 0x1F;
+    tm.tm_sec = second * 2;
+
+    return Set(mktime(&tm));
+}
+
+unsigned long wxDateTime::GetAsDOS() const
+{
+    unsigned long ddt;
+    time_t ticks = GetTicks();
+    struct tm *tm = localtime(&ticks);
+
+    long year = tm->tm_year;
+    year -= 80;
+    year <<= 25;
+
+    long month = tm->tm_mon;
+    month += 1;
+    month <<= 21;
+
+    long day = tm->tm_mday;
+    day <<= 16;
+
+    long hour = tm->tm_hour;
+    hour <<= 11;
+
+    long minute = tm->tm_min;
+    minute <<= 5;
+
+    long second = tm->tm_sec;
+    second /= 2;
+
+    ddt = year | month | day | hour | minute | second;
+    return ddt;
+}
+
 // ----------------------------------------------------------------------------
 // time_t <-> broken down time conversions
 // ----------------------------------------------------------------------------