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diff --git a/libkcal/icalformatimpl.h b/libkcal/icalformatimpl.h
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+/*
+    This file is part of libkcal.
+    Copyright (c) 2001 Cornelius Schumacher <schumacher@kde.org>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+*/
+#ifndef ICALFORMATIMPL_H
+#define ICALFORMATIMPL_H
+
+#include <qstring.h>
+
+#include "scheduler.h"
+#include "freebusy.h"
+
+extern "C" {
+  #include <ical.h>
+  #include <icalss.h>
+}
+
+namespace KCal {
+
+class Compat;
+
+/**
+  This class provides the libical dependent functions for ICalFormat.
+*/
+class ICalFormatImpl {
+  public:
+    /** Create new iCal format for calendar object */
+    ICalFormatImpl( ICalFormat *parent );
+    virtual ~ICalFormatImpl();
+
+    bool populate( Calendar *, icalcomponent *fs);
+
+    icalcomponent *writeIncidence(Incidence *incidence);
+    icalcomponent *writeTodo(Todo *todo);
+    icalcomponent *writeEvent(Event *event);
+    icalcomponent *writeFreeBusy(FreeBusy *freebusy,
+                                 Scheduler::Method method);
+    icalcomponent *writeJournal(Journal *journal);
+    void writeIncidence(icalcomponent *parent,Incidence *incidence);
+    icalproperty *writeAttendee(Attendee *attendee);
+    icalproperty *writeAttachment(Attachment *attach);
+    icalproperty *writeRecurrenceRule(Recurrence *);
+    icalproperty *writeAlarm(Alarm *alarm);
+
+    QString extractErrorProperty(icalcomponent *);
+    Todo *readTodo(icalcomponent *vtodo);
+    Event *readEvent(icalcomponent *vevent);
+    FreeBusy *readFreeBusy(icalcomponent *vfreebusy);
+    Journal *readJournal(icalcomponent *vjournal);
+    Attendee *readAttendee(icalproperty *attendee);
+    Attachment *readAttachment(icalproperty *attach);
+    void readIncidence(icalcomponent *parent,Incidence *incidence);
+    void readRecurrenceRule(struct icalrecurrencetype rrule,Incidence *event);
+    void readRecurrence( const struct icalrecurrencetype &r, Recurrence* recur,Incidence *event );
+    void readAlarm(icalcomponent *alarm,Incidence *incidence);
+    /** Return the PRODID string loaded from calendar file */
+    const QString &loadedProductId()  { return mLoadedProductId; }
+
+    icaltimetype writeICalDate(const QDate &);
+    QDate readICalDate(icaltimetype);
+    icaltimetype writeICalDateTime(const QDateTime &);
+    QDateTime readICalDateTime(icaltimetype);
+    icaldurationtype writeICalDuration(int seconds);
+    int readICalDuration(icaldurationtype);
+    icalcomponent *createCalendarComponent(Calendar * = 0);
+    icalcomponent *createScheduleComponent(IncidenceBase *,Scheduler::Method);
+
+  private:
+    void writeIncidenceBase(icalcomponent *parent,IncidenceBase *);
+    void readIncidenceBase(icalcomponent *parent,IncidenceBase *);
+    void writeCustomProperties(icalcomponent *parent,CustomProperties *);
+    void readCustomProperties(icalcomponent *parent,CustomProperties *);
+    void dumpIcalRecurrence(icalrecurrencetype);
+
+    ICalFormat *mParent;
+    Calendar *mCalendar;
+
+    QString mLoadedProductId;         // PRODID string loaded from calendar file
+    int mCalendarVersion;             // determines backward compatibility mode on read
+
+    QPtrList<Event> mEventsRelate;           // events with relations
+    QPtrList<Todo> mTodosRelate;             // todos with relations
+
+    static const int mSecondsPerWeek;
+    static const int mSecondsPerDay;
+    static const int mSecondsPerHour;
+    static const int mSecondsPerMinute;
+
+    Compat *mCompat;
+};
+
+}
+
+#endif