1 files changed, 150 insertions, 0 deletions
diff --git a/kalarm/calendarcompat.cpp b/kalarm/calendarcompat.cpp
new file mode 100644
index 000000000..ada75e768
--- /dev/null
+++ b/kalarm/calendarcompat.cpp
@@ -0,0 +1,150 @@
+/*
+ *  calendarcompat.cpp -  compatibility for old calendar file formats
+ *  Program:  kalarm
+ *  Copyright © 2001-2006 by David Jarvie <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "kalarm.h"
+
+#include <qfile.h>
+#include <qtextstream.h>
+#include <qstringlist.h>
+
+#include <kapplication.h>
+#include <kaboutdata.h>
+#include <kdebug.h>
+
+#include <libkcal/calendar.h>
+
+#include "alarmevent.h"
+#include "functions.h"
+#include "preferences.h"
+#include "calendarcompat.h"
+
+using namespace KCal;
+
+
+/******************************************************************************
+* Find the version of KAlarm which wrote the calendar file, and do any
+* necessary conversions to the current format. The calendar is not saved - any
+* conversions will only be saved if changes are made later.
+*/
+void CalendarCompat::fix(KCal::Calendar& calendar, const QString& localFile)
+{
+	bool version057_UTC = false;
+	QString subVersion;
+	int version = readKAlarmVersion(calendar, subVersion);
+	if (!version)
+	{
+		// The calendar was created either by the current version of KAlarm,
+		// or another program, so don't do any conversions
+		return;
+	}
+	if (version == KAlarm::Version(0,5,7)  &&  !localFile.isEmpty())
+	{
+		// KAlarm version 0.5.7 - check whether times are stored in UTC, in which
+		// case it is the KDE 3.0.0 version, which needs adjustment of summer times.
+		version057_UTC = isUTC(localFile);
+		kdDebug(5950) << "CalendarCompat::fix(): KAlarm version 0.5.7 (" << (version057_UTC ? "" : "non-") << "UTC)\n";
+	}
+	else
+		kdDebug(5950) << "CalendarCompat::fix(): KAlarm version " << version << endl;
+
+	// Convert events to current KAlarm format for when calendar is saved
+	KAEvent::convertKCalEvents(calendar, version, version057_UTC);
+}
+
+/******************************************************************************
+* Return the KAlarm version which wrote the calendar which has been loaded.
+* The format is, for example, 000507 for 0.5.7.
+* Reply = 0 if the calendar was created by the current version of KAlarm,
+*           KAlarm pre-0.3.5, or another program.
+*/
+int CalendarCompat::readKAlarmVersion(KCal::Calendar& calendar, QString& subVersion)
+{
+	subVersion = QString::null;
+	const QString& prodid = calendar.productId();
+
+	// Find the KAlarm identifier
+	QString progname = QString::fromLatin1(" KAlarm ");
+	int i = prodid.find(progname, 0, false);
+	if (i < 0)
+	{
+		// Older versions used KAlarm's translated name in the product ID, which
+		// could have created problems using a calendar in different locales.
+		progname = QString(" ") + kapp->aboutData()->programName() + ' ';
+		i = prodid.find(progname, 0, false);
+		if (i < 0)
+			return 0;    // calendar wasn't created by KAlarm
+	}
+
+	// Extract the KAlarm version string
+	QString ver = prodid.mid(i + progname.length()).stripWhiteSpace();
+	i = ver.find('/');
+	int j = ver.find(' ');
+	if (j >= 0  &&  j < i)
+		i = j;
+	if (i <= 0)
+		return 0;    // missing version string
+	ver = ver.left(i);     // ver now contains the KAlarm version string
+	if (ver == KAlarm::currentCalendarVersionString())
+		return 0;      // the calendar is in the current KAlarm format
+	return KAlarm::getVersionNumber(ver, &subVersion);
+}
+
+/******************************************************************************
+ * Check whether the calendar file has its times stored as UTC times,
+ * indicating that it was written by the KDE 3.0.0 version of KAlarm 0.5.7.
+ * Reply = true if times are stored in UTC
+ *       = false if the calendar is a vCalendar, times are not UTC, or any error occurred.
+ */
+bool CalendarCompat::isUTC(const QString& localFile)
+{
+	// Read the calendar file into a QString
+	QFile file(localFile);
+	if (!file.open(IO_ReadOnly))
+		return false;
+	QTextStream ts(&file);
+	ts.setEncoding(QTextStream::Latin1);
+	QString text = ts.read();
+	file.close();
+
+	// Extract the CREATED property for the first VEVENT from the calendar
+	QString VCALENDAR = QString::fromLatin1("BEGIN:VCALENDAR");
+	QString VEVENT    = QString::fromLatin1("BEGIN:VEVENT");
+	QString CREATED   = QString::fromLatin1("CREATED:");
+	QStringList lines = QStringList::split(QChar('\n'), text);
+	for (QStringList::ConstIterator it = lines.begin();  it != lines.end(); ++it)
+	{
+		if ((*it).startsWith(VCALENDAR))
+		{
+			while (++it != lines.end())
+			{
+				if ((*it).startsWith(VEVENT))
+				{
+					while (++it != lines.end())
+					{
+						if ((*it).startsWith(CREATED))
+							return (*it).endsWith("Z");
+					}
+				}
+			}
+			break;
+		}
+	}
+	return false;
+}