This is the verbatim text of the qiodev.h include file. It is is provided only for illustration; the copyright remains with Troll Tech.


/****************************************************************************
** $Id: qiodev.h,v 1.4 1995/02/16 21:00:04 hanord Exp $
**
** Definition of QIODevice class
**
** Author  : Haavard Nord
** Created : 940913
**
** Copyright (C) 1994,1995 by Troll Tech AS.  All rights reserved.
**
*****************************************************************************/

#ifndef QIODEV_H
#define QIODEV_H

#include "qglobal.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                  0x0010          // raw access (not buffered)
#define IO_Async                0x0020          // asynchronous mode

// IO device open modes

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


class 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; }

#undef  TB
#define TB(x) ((ioMode & (x)) == x)
    bool         isDirectAccess()     const { return TB(IO_Direct); }
    bool         isSequentialAccess() const { return TB(IO_Sequential); }
    bool         isCombinedAccess()   const { return TB(IO_Combined); }
    bool         isBuffered()         const { return !TB(IO_Raw); }
    bool         isRaw()              const { return TB(IO_Raw); }
    bool         isSynchronous()      const { return !TB(IO_Async); }
    bool         isAsynchronous()     const { return TB(IO_Async); }
    bool         isTranslated()       const { return TB(IO_Translate); }
    bool         isReadable()         const { return TB(IO_ReadOnly); }
    bool         isWritable()         const { return TB(IO_WriteOnly); }
    bool         isReadWrite()        const { return TB(IO_ReadWrite); }
#undef  TB
    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;          // open device
    virtual void close() = 0;                   // close device
    virtual void flush() = 0;                   // flush device

    virtual long size()   const = 0;            // get size of data
    virtual long at()     const;                // get data index
    virtual bool at( long );                    // set data index
    virtual bool atEnd()  const;                // test if at end of data
    bool         reset() { return at(0); }      // reset data index

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

    virtual int  getch() = 0;                   // get next char
    virtual int  putch( int ) = 0;              // put char
    virtual int  ungetch( int ) = 0;            // put back char

protected:
    void         setFlags( int f ) { ioMode = f; }
    void         setType( int );                // set device type
    void         setMode( int );                // set device mode
    void         setState( int );               // set device state
    void         setStatus( int );              // set device status
    long         index;                         // data index

private:
    int          ioMode;                        // IO mode
    int          ioSt;                          // IO status
};


#endif // QIODEV_H


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