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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qfilesystemengine_p.h"
#include <QtCore/qdir.h>
#include <QtCore/qset.h>
/*!
\internal
Returns the canonicalized form of \a path (i.e., with all symlinks
resolved, and all redundant path elements removed.
*/
QString QFileSystemEngine::slowCanonicalized(const QString &path)
{
if (path.isEmpty())
return path;
QFileInfo fi;
const QChar slash(QLatin1Char('/'));
QString tmpPath = path;
int separatorPos = 0;
QSet<QString> nonSymlinks;
QSet<QString> known;
known.insert(path);
do {
#ifdef Q_OS_WIN
if (separatorPos == 0) {
if (tmpPath.size() >= 2 && tmpPath.at(0) == slash && tmpPath.at(1) == slash) {
// UNC, skip past the first two elements
separatorPos = tmpPath.indexOf(slash, 2);
} else if (tmpPath.size() >= 3 && tmpPath.at(1) == QLatin1Char(':') && tmpPath.at(2) == slash) {
// volume root, skip since it can not be a symlink
separatorPos = 2;
}
}
if (separatorPos != -1)
#endif
separatorPos = tmpPath.indexOf(slash, separatorPos + 1);
QString prefix = separatorPos == -1 ? tmpPath : tmpPath.left(separatorPos);
if (
#ifdef Q_OS_SYMBIAN
// Symbian doesn't support directory symlinks, so do not check for link unless we
// are handling the last path element. This not only slightly improves performance,
// but also saves us from lot of unnecessary platform security check failures
// when dealing with files under *:/private directories.
separatorPos == -1 &&
#endif
!nonSymlinks.contains(prefix)) {
fi.setFile(prefix);
if (fi.isSymLink()) {
QString target = fi.symLinkTarget();
if(QFileInfo(target).isRelative())
target = fi.absolutePath() + slash + target;
if (separatorPos != -1) {
if (fi.isDir() && !target.endsWith(slash))
target.append(slash);
target.append(tmpPath.mid(separatorPos));
}
tmpPath = QDir::cleanPath(target);
separatorPos = 0;
if (known.contains(tmpPath))
return QString();
known.insert(tmpPath);
} else {
nonSymlinks.insert(prefix);
}
}
} while (separatorPos != -1);
return QDir::cleanPath(tmpPath);
}
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