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# qiodevice.h

This is the verbatim text of the qiodevice.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/qiodevice.h   3.2.1   edited Jun 1 18:37 $
    **
    ** Definition of QIODevice class
    **
    ** Created : 940913
    **
    ** Copyright (C) 1992-2002 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the tools module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QIODEVICE_H
    #define QIODEVICE_H

    #ifndef QT_H
    #include "qglobal.h"
    #include "qcstring.h"
    #endif // QT_H

    // IO device access types

    #define IO_Direct		0x0100		// direct access device
    #define IO_Sequential		0x0200		// sequential access device
    #define IO_Combined		0x0300		// combined direct/sequential
    #define IO_TypeMask		0x0f00

    // IO handling modes

    #define IO_Raw			0x0040		// raw access (not buffered)
    #define IO_Async		0x0080		// asynchronous mode

    // IO device open modes

    #define IO_ReadOnly		0x0001		// readable device
    #define IO_WriteOnly		0x0002		// writable device
    #define IO_ReadWrite		0x0003		// read+write device
    #define IO_Append		0x0004		// append
    #define IO_Truncate		0x0008		// truncate device
    #define IO_Translate		0x0010		// translate CR+LF
    #define IO_ModeMask		0x00ff

    // IO device state

    #define IO_Open			0x1000		// device is open
    #define IO_StateMask		0xf000

    // IO device status

    #define IO_Ok			0
    #define IO_ReadError		1		// read error
    #define IO_WriteError		2		// write error
    #define IO_FatalError		3		// fatal unrecoverable error
    #define IO_ResourceError	4		// resource limitation
    #define IO_OpenError		5		// cannot open device
    #define IO_ConnectError		5		// cannot connect to device
    #define IO_AbortError		6		// abort error
    #define IO_TimeOutError		7		// time out
    #define IO_UnspecifiedError	8		// unspecified error

    class Q_EXPORT QIODevice
    {
    public:
    #if defined(QT_ABI_QT4)
        typedef QtOffset Offset;
    #else
        typedef Q_ULONG Offset;
    #endif

        QIODevice();
        virtual ~QIODevice();

        int		 flags()  const { return ioMode; }
        int		 mode()	  const { return ioMode & IO_ModeMask; }
        int		 state()  const { return ioMode & IO_StateMask; }

        bool	 isDirectAccess()     const { return ((ioMode & IO_Direct)     == IO_Direct); }
        bool	 isSequentialAccess() const { return ((ioMode & IO_Sequential) == IO_Sequential); }
        bool	 isCombinedAccess()   const { return ((ioMode & IO_Combined)   == IO_Combined); }
        bool	 isBuffered()	      const { return ((ioMode & IO_Raw)        != IO_Raw); }
        bool	 isRaw()	      const { return ((ioMode & IO_Raw)        == IO_Raw); }
        bool	 isSynchronous()      const { return ((ioMode & IO_Async)      != IO_Async); }
        bool	 isAsynchronous()     const { return ((ioMode & IO_Async)      == IO_Async); }
        bool	 isTranslated()	      const { return ((ioMode & IO_Translate)  == IO_Translate); }
        bool	 isReadable()	      const { return ((ioMode & IO_ReadOnly)   == IO_ReadOnly); }
        bool	 isWritable()	      const { return ((ioMode & IO_WriteOnly)  == IO_WriteOnly); }
        bool	 isReadWrite()	      const { return ((ioMode & IO_ReadWrite)  == IO_ReadWrite); }
        bool	 isInactive()	      const { return state() == 0; }
        bool	 isOpen()	      const { return state() == IO_Open; }

        int		 status() const { return ioSt; }
        void	 resetStatus()	{ ioSt = IO_Ok; }

        virtual bool open( int mode ) = 0;
        virtual void close() = 0;
        virtual void flush() = 0;

        virtual Offset size()  const = 0;
        virtual Offset at()  const;
        virtual bool at( Offset );
        virtual bool atEnd()  const;
        bool	 reset() { return at(0); }

        virtual Q_LONG readBlock( char *data, Q_ULONG maxlen ) = 0;
        virtual Q_LONG writeBlock( const char *data, Q_ULONG len ) = 0;
        virtual Q_LONG readLine( char *data, Q_ULONG maxlen );
        Q_LONG writeBlock( const QByteArray& data );
        virtual QByteArray readAll();

        virtual int	 getch() = 0;
        virtual int	 putch( int ) = 0;
        virtual int	 ungetch( int ) = 0;

    protected:
        void	 setFlags( int f ) { ioMode = f; }
        void	 setType( int );
        void	 setMode( int );
        void	 setState( int );
        void	 setStatus( int );
        Offset	 ioIndex;

    private:
        int		 ioMode;
        int		 ioSt;

    private:	// Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QIODevice( const QIODevice & );
        QIODevice &operator=( const QIODevice & );
    #endif
    };

    #endif // QIODEVICE_H