lib

KoStoreDevice.h

00001 /* This file is part of the KDE project
00002    Copyright (C) 2000 David Faure <faure@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License as published by the Free Software Foundation; either
00007    version 2 of the License, or (at your option) any later version.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public License for more details.
00013 
00014    You should have received a copy of the GNU Library General Public License
00015    along with this library; see the file COPYING.LIB.  If not, write to
00016    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  * Boston, MA 02110-1301, USA.
00018 */
00019 
00020 #ifndef koStoreDevice_h
00021 #define koStoreDevice_h
00022 
00023 #include <KoStore.h>
00024 
00030 class KoStoreDevice : public QIODevice
00031 {
00032 public:
00034   KoStoreDevice( KoStore * store ) : m_store(store) {
00035       setType( IO_Direct );
00036   }
00037   ~KoStoreDevice() {}
00038 
00039   bool open( int m ) {
00040     if ( m & IO_ReadOnly )
00041       return ( m_store->mode() == KoStore::Read );
00042     if ( m & IO_WriteOnly )
00043       return ( m_store->mode() == KoStore::Write );
00044     return false;
00045   }
00046   void close() { }
00047   void flush() { }
00048 
00049   Offset size() const {
00050     if ( m_store->mode() == KoStore::Read )
00051       return m_store->size();
00052     else
00053       return 0xffffffff;
00054   }
00055 
00056   virtual Q_LONG readBlock( char *data, Q_ULONG maxlen ) { return m_store->read(data, maxlen); }
00057   virtual Q_LONG writeBlock( const char *data, Q_ULONG len ) { return m_store->write( data, len ); }
00058   // Not virtual, only to uncover shadow
00059   Q_LONG writeBlock( const QByteArray& data ) { return QIODevice::writeBlock( data ); }
00060 
00061   int getch() {
00062     char c[2];
00063     if ( m_store->read(c, 1) == -1)
00064       return -1;
00065     else
00066       return c[0];
00067   }
00068   int putch( int _c ) {
00069     char c[2];
00070     c[0] = _c;
00071     c[1] = 0;
00072     if (m_store->write( c, 1 ) == 1)
00073       return _c;
00074     else
00075       return -1;
00076   }
00077   int ungetch( int ) { return -1; } // unsupported
00078 
00079   // See QIODevice
00080   virtual bool at( Offset pos ) { return m_store->at(pos); }
00081   virtual Offset at() const { return m_store->at(); }
00082   virtual bool atEnd() const { return m_store->atEnd(); }
00083 
00084 protected:
00085   KoStore * m_store;
00086 };
00087 
00088 #endif
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