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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/src/tools/qiodevice.h   2.3.3   edited 2001-01-26 $
    **
    ** Definition of QIODevice class
    **
    ** Created : 940913
    **
    ** Copyright (C) 1992-2000 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                                        // IO device class
    {
    public:
        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 uint size()   const = 0;
        virtual int  at()     const;
        virtual bool at( int );
        virtual bool atEnd()  const;
        bool         reset() { return at(0); }

        virtual int  readBlock( char *data, uint maxlen ) = 0;
        virtual int  writeBlock( const char *data, uint len ) = 0;
        virtual int  readLine( char *data, uint maxlen );
        int writeBlock( const QByteArray& data );
        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 );
        int          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