qiodevice.cpp

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/****************************************************************************
** $Id: qiodevice.cpp,v 1.2 2003/07/10 02:40:12 llornkcor Exp $
**
** Implementation 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
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**********************************************************************/

#include "qiodevice.h"

QIODevice::QIODevice()
{
    ioMode = 0;                                 // initial mode
    ioSt = IO_Ok;
    ioIndex = 0;
}

QIODevice::~QIODevice()
{
}


void QIODevice::setType( int t )
{
#if defined(QT_CHECK_RANGE)
    if ( (t & IO_TypeMask) != t )
        qWarning( "QIODevice::setType: Specified type out of range" );
#endif
    ioMode &= ~IO_TypeMask;                     // reset type bits
    ioMode |= t;
}

void QIODevice::setMode( int m )
{
#if defined(QT_CHECK_RANGE)
    if ( (m & IO_ModeMask) != m )
        qWarning( "QIODevice::setMode: Specified mode out of range" );
#endif
    ioMode &= ~IO_ModeMask;                     // reset mode bits
    ioMode |= m;
}

void QIODevice::setState( int s )
{
#if defined(QT_CHECK_RANGE)
    if ( ((uint)s & IO_StateMask) != (uint)s )
        qWarning( "QIODevice::setState: Specified state out of range" );
#endif
    ioMode &= ~IO_StateMask;                    // reset state bits
    ioMode |= (uint)s;
}

void QIODevice::setStatus( int s )
{
    ioSt = s;
}


QIODevice::Offset QIODevice::at() const
{
    return ioIndex;
}


/*
    The following is a "bad" overload, since it does "not behave essentially
    the same" like the above. So don't use  \overload in the documentation of
    this function and we have to live with the qdoc warning which is generated
    for this.
*/
bool QIODevice::at( Offset pos )
{
#if defined(QT_CHECK_RANGE)
    if ( pos > size() ) {
#if defined(QT_LARGEFILE_SUPPORT) && defined(QT_ABI_64BITOFFSET)
        qWarning( "QIODevice::at: Index %llu out of range", pos );
#else
        qWarning( "QIODevice::at: Index %lu out of range", pos );
#endif
        return FALSE;
    }
#endif
    ioIndex = pos;
    return TRUE;
}

bool QIODevice::atEnd() const
{
    if ( isSequentialAccess() || isTranslated() ) {
        QIODevice* that = (QIODevice*)this;
        int c = that->getch();
        bool result = c < 0;
        that->ungetch(c);
        return result;
    } else {
        return at() == size();
    }
}

QByteArray QIODevice::readAll()
{
    if ( isDirectAccess() ) {
        // we know the size
        int n = size()-at(); // ### fix for 64-bit or large files?
        int totalRead = 0;
        QByteArray ba( n );
        char* c = ba.data();
        while ( n ) {
            int r = readBlock( c, n );
            if ( r < 0 )
                return QByteArray();
            n -= r;
            c += r;
            totalRead += r;
            // If we have a translated file, then it is possible that
            // we read less bytes than size() reports
            if ( atEnd() ) {
                ba.resize( totalRead );
                break;
            }
        }
        return ba;
    } else {
        // read until we reach the end
        const int blocksize = 512;
        int nread = 0;
        QByteArray ba;
        while ( !atEnd() ) {
            ba.resize( nread + blocksize );
            int r = readBlock( ba.data()+nread, blocksize );
            if ( r < 0 )
                return QByteArray();
            nread += r;
        }
        ba.resize( nread );
        return ba;
    }
}

Q_LONG QIODevice::writeBlock( const QByteArray& data )
{
    return writeBlock( data.data(), data.size() );
}

Q_LONG QIODevice::readLine( char *data, Q_ULONG maxlen )
{
    if ( maxlen == 0 )                          // application bug?
        return 0;
    char *p = data;
    while ( --maxlen && (readBlock(p,1)>0) ) {  // read one byte at a time
        if ( *p++ == '\n' )                     // end of line
            break;
    }
    *p++ = '\0';
    return p - data;
}

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