qlibrary.cpp

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/****************************************************************************
** $Id: qlibrary.cpp,v 1.2 2003/07/10 02:40:12 llornkcor Exp $
**
** Implementation of QLibrary class
**
** Created : 000101
**
** Copyright (C) 2000-2003 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.
**
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** not clear to you.
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**********************************************************************/

#include "qplatformdefs.h"
#include <private/qlibrary_p.h>

#ifndef QT_NO_LIBRARY

// uncomment this to get error messages
//#define QT_DEBUG_COMPONENT 1
// uncomment this to get error and success messages
//#define QT_DEBUG_COMPONENT 2

#ifndef QT_DEBUG_COMPONENT
# if defined(QT_DEBUG)
#  define QT_DEBUG_COMPONENT 1
# endif
#endif

#if defined(QT_DEBUG_COMPONENT)
#include <qfile.h>
#endif

#if defined(Q_WS_WIN) && !defined(QT_MAKEDLL)
#define QT_NO_LIBRARY_UNLOAD
#endif

QLibraryPrivate::QLibraryPrivate( QLibrary *lib )
    : pHnd( 0 ), library( lib )
{
}


QLibrary::QLibrary( const QString& filename )
    : libfile( filename ), aunload( TRUE )
{
    libfile.replace( '\\', '/' );
    d = new QLibraryPrivate( this );
}

QLibrary::~QLibrary()
{
    if ( autoUnload() )
        unload();

    delete d;
}

void *QLibrary::resolve( const char* symb )
{
    if ( !d->pHnd )
        load();
    if ( !d->pHnd )
        return 0;

    void *address = d->resolveSymbol( symb );

    return address;
}

void *QLibrary::resolve( const QString &filename, const char *symb )
{
    QLibrary lib( filename );
    lib.setAutoUnload( FALSE );
    return lib.resolve( symb );
}

bool QLibrary::isLoaded() const
{
    return d->pHnd != 0;
}

bool QLibrary::load()
{
    return d->loadLibrary();
}

bool QLibrary::unload()
{
    if ( !d->pHnd )
        return TRUE;

#if !defined(QT_NO_LIBRARY_UNLOAD)
    if ( !d->freeLibrary() ) {
# if defined(QT_DEBUG_COMPONENT)
        qWarning( "%s could not be unloaded", (const char*) QFile::encodeName(library()) );
# endif
        return FALSE;
    }

# if defined(QT_DEBUG_COMPONENT) && QT_DEBUG_COMPONENT == 2
    qWarning( "%s has been unloaded", (const char*) QFile::encodeName(library()) );
# endif
    d->pHnd = 0;
#endif
    return TRUE;
}

bool QLibrary::autoUnload() const
{
    return (bool)aunload;
}

void QLibrary::setAutoUnload( bool enabled )
{
    aunload = enabled;
}

QString QLibrary::library() const
{
    if ( libfile.isEmpty() )
        return libfile;

    QString filename = libfile;

#if defined(Q_WS_WIN)
    if ( filename.findRev( '.' ) <= filename.findRev( '/' ) )
        filename += ".dll";
#elif defined(Q_OS_MACX)
    if ( filename.find( ".dylib" ) == -1 )
        filename += ".dylib";
#else
    QString filter = ".so";
    if ( filename.find(filter) == -1 ) {
        const int x = filename.findRev( "/" );
        if ( x != -1 ) {
            QString path = filename.left( x + 1 );
            QString file = filename.right( filename.length() - x - 1 );
            filename = QString( "%1lib%2.%3" ).arg( path ).arg( file ).arg( filter );
        } else {
            filename = QString( "lib%1.%2" ).arg( filename ).arg( filter );
        }
    }
#endif

    return filename;
}
#endif //QT_NO_LIBRARY

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