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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qfsfileengine_p.h"
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#include "qfsfileengine_iterator_p.h"
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#include "qdatetime.h"
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#include "qdiriterator.h"
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#include "qset.h"
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#include <QtCore/qdebug.h>
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#ifndef QT_NO_FSFILEENGINE
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#if !defined(Q_OS_WINCE)
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#include <errno.h>
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#endif
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#if defined(Q_OS_UNIX)
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#include "private/qcore_unix_p.h"
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#endif
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#include <stdio.h>
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QT_BEGIN_NAMESPACE
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#ifdef Q_OS_WIN
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# ifndef S_ISREG
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# define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
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# endif
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# ifndef S_ISCHR
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# define S_ISCHR(x) (((x) & S_IFMT) == S_IFCHR)
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# endif
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# ifndef S_ISFIFO
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# define S_ISFIFO(x) false
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# endif
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# ifndef S_ISSOCK
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# define S_ISSOCK(x) false
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# endif
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# ifndef INVALID_FILE_ATTRIBUTES
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# define INVALID_FILE_ATTRIBUTES (DWORD (-1))
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# endif
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#endif
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/*! \class QFSFileEngine
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\brief The QFSFileEngine class implements Qt's default file engine.
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\since 4.1
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This class is part of the file engine framework in Qt. If you only want to
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access files or directories, use QFile, QFileInfo or QDir instead.
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QFSFileEngine is the default file engine for accessing regular files. It
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is provided for convenience; by subclassing this class, you can alter its
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behavior slightly, without having to write a complete QAbstractFileEngine
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subclass. To install your custom file engine, you must also subclass
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QAbstractFileEngineHandler and create an instance of your handler.
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It can also be useful to create a QFSFileEngine object directly if you
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need to use the local file system inside QAbstractFileEngine::create(), in
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order to avoid recursion (as higher-level classes tend to call
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QAbstractFileEngine::create()).
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*/
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//**************** QFSFileEnginePrivate
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QFSFileEnginePrivate::QFSFileEnginePrivate() : QAbstractFileEnginePrivate()
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{
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init();
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}
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/*!
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\internal
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*/
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void QFSFileEnginePrivate::init()
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{
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is_sequential = 0;
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tried_stat = 0;
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#if !defined(Q_OS_WINCE)
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need_lstat = 1;
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is_link = 0;
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#endif
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openMode = QIODevice::NotOpen;
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fd = -1;
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fh = 0;
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lastIOCommand = IOFlushCommand;
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lastFlushFailed = false;
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closeFileHandle = false;
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#ifdef Q_OS_WIN
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fileAttrib = INVALID_FILE_ATTRIBUTES;
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fileHandle = INVALID_HANDLE_VALUE;
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cachedFd = -1;
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#endif
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#ifdef Q_USE_DEPRECATED_MAP_API
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fileMapHandle = INVALID_HANDLE_VALUE;
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#endif
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}
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/*!
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\internal
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Returns the canonicalized form of \a path (i.e., with all symlinks
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resolved, and all redundant path elements removed.
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*/
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QString QFSFileEnginePrivate::canonicalized(const QString &path)
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{
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if (path.isEmpty())
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return path;
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QFileInfo fi;
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const QChar slash(QLatin1Char('/'));
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QString tmpPath = path;
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int separatorPos = 0;
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QSet<QString> nonSymlinks;
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QSet<QString> known;
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known.insert(path);
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do {
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#ifdef Q_OS_WIN
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// UNC, skip past the first two elements
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if (separatorPos == 0 && tmpPath.startsWith(QLatin1String("//")))
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separatorPos = tmpPath.indexOf(slash, 2);
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if (separatorPos != -1)
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#endif
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separatorPos = tmpPath.indexOf(slash, separatorPos + 1);
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QString prefix = separatorPos == -1 ? tmpPath : tmpPath.left(separatorPos);
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if (
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#ifdef Q_OS_SYMBIAN
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// Symbian doesn't support directory symlinks, so do not check for link unless we
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// are handling the last path element. This not only slightly improves performance,
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// but also saves us from lot of unnecessary platform security check failures
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// when dealing with files under *:/private directories.
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separatorPos == -1 &&
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#endif
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!nonSymlinks.contains(prefix)) {
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fi.setFile(prefix);
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if (fi.isSymLink()) {
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QString target = fi.symLinkTarget();
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if (separatorPos != -1) {
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if (fi.isDir() && !target.endsWith(slash))
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target.append(slash);
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target.append(tmpPath.mid(separatorPos));
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}
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tmpPath = QDir::cleanPath(target);
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separatorPos = 0;
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if (known.contains(tmpPath))
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return QString();
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known.insert(tmpPath);
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} else {
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nonSymlinks.insert(prefix);
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}
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}
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} while (separatorPos != -1);
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return QDir::cleanPath(tmpPath);
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}
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/*!
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Constructs a QFSFileEngine for the file name \a file.
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*/
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QFSFileEngine::QFSFileEngine(const QString &file) : QAbstractFileEngine(*new QFSFileEnginePrivate)
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{
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Q_D(QFSFileEngine);
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d->filePath = QDir::fromNativeSeparators(file);
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d->nativeInitFileName();
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}
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/*!
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Constructs a QFSFileEngine.
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*/
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QFSFileEngine::QFSFileEngine() : QAbstractFileEngine(*new QFSFileEnginePrivate)
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{
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}
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/*!
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\internal
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*/
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QFSFileEngine::QFSFileEngine(QFSFileEnginePrivate &dd)
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: QAbstractFileEngine(dd)
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{
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}
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/*!
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Destructs the QFSFileEngine.
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*/
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QFSFileEngine::~QFSFileEngine()
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{
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Q_D(QFSFileEngine);
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if (d->closeFileHandle) {
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if (d->fh) {
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int ret;
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do {
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ret = fclose(d->fh);
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} while (ret == EOF && errno == EINTR);
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} else if (d->fd != -1) {
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int ret;
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do {
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ret = QT_CLOSE(d->fd);
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} while (ret == -1 && errno == EINTR);
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}
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}
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QList<uchar*> keys = d->maps.keys();
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for (int i = 0; i < keys.count(); ++i)
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unmap(keys.at(i));
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}
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/*!
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\reimp
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*/
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void QFSFileEngine::setFileName(const QString &file)
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{
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Q_D(QFSFileEngine);
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d->init();
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d->filePath = QDir::fromNativeSeparators(file);
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d->nativeInitFileName();
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}
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/*!
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\reimp
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*/
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bool QFSFileEngine::open(QIODevice::OpenMode openMode)
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{
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Q_D(QFSFileEngine);
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if (d->filePath.isEmpty()) {
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qWarning("QFSFileEngine::open: No file name specified");
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setError(QFile::OpenError, QLatin1String("No file name specified"));
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return false;
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}
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// Append implies WriteOnly.
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if (openMode & QFile::Append)
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openMode |= QFile::WriteOnly;
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// WriteOnly implies Truncate if neither ReadOnly nor Append are sent.
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if ((openMode & QFile::WriteOnly) && !(openMode & (QFile::ReadOnly | QFile::Append)))
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openMode |= QFile::Truncate;
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d->openMode = openMode;
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d->lastFlushFailed = false;
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d->tried_stat = 0;
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d->fh = 0;
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d->fd = -1;
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return d->nativeOpen(openMode);
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}
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/*!
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Opens the file handle \a fh in \a openMode mode. Returns true on
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success; otherwise returns false.
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*/
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bool QFSFileEngine::open(QIODevice::OpenMode openMode, FILE *fh)
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{
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Q_D(QFSFileEngine);
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// Append implies WriteOnly.
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if (openMode & QFile::Append)
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openMode |= QFile::WriteOnly;
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// WriteOnly implies Truncate if neither ReadOnly nor Append are sent.
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if ((openMode & QFile::WriteOnly) && !(openMode & (QFile::ReadOnly | QFile::Append)))
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openMode |= QFile::Truncate;
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d->openMode = openMode;
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d->lastFlushFailed = false;
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d->closeFileHandle = false;
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d->nativeFilePath.clear();
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d->filePath.clear();
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d->tried_stat = 0;
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d->fd = -1;
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return d->openFh(openMode, fh);
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}
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/*!
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Opens the file handle \a fh using the open mode \a flags.
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*/
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bool QFSFileEnginePrivate::openFh(QIODevice::OpenMode openMode, FILE *fh)
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{
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Q_Q(QFSFileEngine);
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this->fh = fh;
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fd = -1;
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// Seek to the end when in Append mode.
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if (openMode & QIODevice::Append) {
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int ret;
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do {
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ret = QT_FSEEK(fh, 0, SEEK_END);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1) {
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q->setError(errno == EMFILE ? QFile::ResourceError : QFile::OpenError,
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qt_error_string(int(errno)));
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this->openMode = QIODevice::NotOpen;
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this->fh = 0;
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return false;
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}
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}
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return true;
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}
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/*!
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Opens the file descriptor \a fd in \a openMode mode. Returns true
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on success; otherwise returns false.
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*/
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bool QFSFileEngine::open(QIODevice::OpenMode openMode, int fd)
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{
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Q_D(QFSFileEngine);
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// Append implies WriteOnly.
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if (openMode & QFile::Append)
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openMode |= QFile::WriteOnly;
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349 |
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// WriteOnly implies Truncate if neither ReadOnly nor Append are sent.
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if ((openMode & QFile::WriteOnly) && !(openMode & (QFile::ReadOnly | QFile::Append)))
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openMode |= QFile::Truncate;
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d->openMode = openMode;
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d->lastFlushFailed = false;
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d->closeFileHandle = false;
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d->nativeFilePath.clear();
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d->filePath.clear();
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d->fh = 0;
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d->fd = -1;
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d->tried_stat = 0;
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return d->openFd(openMode, fd);
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}
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366 |
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/*!
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Opens the file descriptor \a fd to the file engine, using the open mode \a
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flags.
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*/
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bool QFSFileEnginePrivate::openFd(QIODevice::OpenMode openMode, int fd)
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{
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Q_Q(QFSFileEngine);
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this->fd = fd;
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fh = 0;
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// Seek to the end when in Append mode.
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if (openMode & QFile::Append) {
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int ret;
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do {
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ret = QT_LSEEK(fd, 0, SEEK_END);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1) {
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q->setError(errno == EMFILE ? QFile::ResourceError : QFile::OpenError,
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qt_error_string(int(errno)));
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387 |
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this->openMode = QIODevice::NotOpen;
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this->fd = -1;
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390 |
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return false;
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}
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}
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394 |
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return true;
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}
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397 |
|
|
398 |
/*!
|
|
399 |
\reimp
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|
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*/
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|
401 |
bool QFSFileEngine::close()
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402 |
{
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Q_D(QFSFileEngine);
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d->openMode = QIODevice::NotOpen;
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return d->nativeClose();
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}
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|
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/*!
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409 |
\internal
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*/
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411 |
bool QFSFileEnginePrivate::closeFdFh()
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{
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Q_Q(QFSFileEngine);
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|
414 |
if (fd == -1 && !fh)
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415 |
return false;
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416 |
|
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417 |
// Flush the file if it's buffered, and if the last flush didn't fail.
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418 |
bool flushed = !fh || (!lastFlushFailed && q->flush());
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|
419 |
bool closed = true;
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tried_stat = 0;
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|
421 |
|
|
422 |
// Close the file if we created the handle.
|
|
423 |
if (closeFileHandle) {
|
|
424 |
int ret;
|
|
425 |
do {
|
|
426 |
if (fh) {
|
|
427 |
// Close buffered file.
|
|
428 |
ret = fclose(fh) != 0 ? -1 : 0;
|
|
429 |
} else {
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430 |
// Close unbuffered file.
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431 |
ret = QT_CLOSE(fd);
|
|
432 |
}
|
|
433 |
} while (ret == -1 && errno == EINTR);
|
|
434 |
|
|
435 |
// We must reset these guys regardless; calling close again after a
|
|
436 |
// failed close causes crashes on some systems.
|
|
437 |
fh = 0;
|
|
438 |
fd = -1;
|
|
439 |
closed = (ret == 0);
|
|
440 |
}
|
|
441 |
|
|
442 |
// Report errors.
|
|
443 |
if (!flushed || !closed) {
|
|
444 |
if (flushed) {
|
|
445 |
// If not flushed, we want the flush error to fall through.
|
|
446 |
q->setError(QFile::UnspecifiedError, qt_error_string(errno));
|
|
447 |
}
|
|
448 |
return false;
|
|
449 |
}
|
|
450 |
|
|
451 |
return true;
|
|
452 |
}
|
|
453 |
|
|
454 |
/*!
|
|
455 |
\reimp
|
|
456 |
*/
|
|
457 |
bool QFSFileEngine::flush()
|
|
458 |
{
|
|
459 |
Q_D(QFSFileEngine);
|
|
460 |
if ((d->openMode & QIODevice::WriteOnly) == 0) {
|
|
461 |
// Nothing in the write buffers, so flush succeeds in doing
|
|
462 |
// nothing.
|
|
463 |
return true;
|
|
464 |
}
|
|
465 |
return d->nativeFlush();
|
|
466 |
}
|
|
467 |
|
|
468 |
/*!
|
|
469 |
\internal
|
|
470 |
*/
|
|
471 |
bool QFSFileEnginePrivate::flushFh()
|
|
472 |
{
|
|
473 |
Q_Q(QFSFileEngine);
|
|
474 |
|
|
475 |
// Never try to flush again if the last flush failed. Otherwise you can
|
|
476 |
// get crashes on some systems (AIX).
|
|
477 |
if (lastFlushFailed)
|
|
478 |
return false;
|
|
479 |
|
|
480 |
int ret = fflush(fh);
|
|
481 |
|
|
482 |
lastFlushFailed = (ret != 0);
|
|
483 |
lastIOCommand = QFSFileEnginePrivate::IOFlushCommand;
|
|
484 |
|
|
485 |
if (ret != 0) {
|
|
486 |
q->setError(errno == ENOSPC ? QFile::ResourceError : QFile::WriteError,
|
|
487 |
qt_error_string(errno));
|
|
488 |
return false;
|
|
489 |
}
|
|
490 |
return true;
|
|
491 |
}
|
|
492 |
|
|
493 |
/*!
|
|
494 |
\reimp
|
|
495 |
*/
|
|
496 |
qint64 QFSFileEngine::size() const
|
|
497 |
{
|
|
498 |
Q_D(const QFSFileEngine);
|
|
499 |
return d->nativeSize();
|
|
500 |
}
|
|
501 |
|
|
502 |
/*!
|
|
503 |
\internal
|
|
504 |
*/
|
|
505 |
qint64 QFSFileEnginePrivate::sizeFdFh() const
|
|
506 |
{
|
|
507 |
Q_Q(const QFSFileEngine);
|
|
508 |
// ### Fix this function, it should not stat unless the file is closed.
|
|
509 |
QT_STATBUF st;
|
|
510 |
int ret = 0;
|
|
511 |
const_cast<QFSFileEngine *>(q)->flush();
|
|
512 |
if (fh && nativeFilePath.isEmpty()) {
|
|
513 |
// Buffered stdlib mode.
|
|
514 |
// ### This should really be an ftell
|
|
515 |
ret = QT_FSTAT(QT_FILENO(fh), &st);
|
|
516 |
} else if (fd == -1) {
|
|
517 |
// Stateless stat.
|
|
518 |
ret = QT_STAT(nativeFilePath.constData(), &st);
|
|
519 |
} else {
|
|
520 |
// Unbuffered stdio mode.
|
|
521 |
ret = QT_FSTAT(fd, &st);
|
|
522 |
}
|
|
523 |
if (ret == -1)
|
|
524 |
return 0;
|
|
525 |
return st.st_size;
|
|
526 |
}
|
|
527 |
|
|
528 |
/*!
|
|
529 |
\reimp
|
|
530 |
*/
|
|
531 |
qint64 QFSFileEngine::pos() const
|
|
532 |
{
|
|
533 |
Q_D(const QFSFileEngine);
|
|
534 |
return d->nativePos();
|
|
535 |
}
|
|
536 |
|
|
537 |
/*!
|
|
538 |
\internal
|
|
539 |
*/
|
|
540 |
qint64 QFSFileEnginePrivate::posFdFh() const
|
|
541 |
{
|
|
542 |
if (fh)
|
|
543 |
return qint64(QT_FTELL(fh));
|
|
544 |
return QT_LSEEK(fd, 0, SEEK_CUR);
|
|
545 |
}
|
|
546 |
|
|
547 |
/*!
|
|
548 |
\reimp
|
|
549 |
*/
|
|
550 |
bool QFSFileEngine::seek(qint64 pos)
|
|
551 |
{
|
|
552 |
Q_D(QFSFileEngine);
|
|
553 |
return d->nativeSeek(pos);
|
|
554 |
}
|
|
555 |
|
|
556 |
/*!
|
|
557 |
\internal
|
|
558 |
*/
|
|
559 |
bool QFSFileEnginePrivate::seekFdFh(qint64 pos)
|
|
560 |
{
|
|
561 |
Q_Q(QFSFileEngine);
|
|
562 |
|
|
563 |
// On Windows' stdlib implementation, the results of calling fread and
|
|
564 |
// fwrite are undefined if not called either in sequence, or if preceded
|
|
565 |
// with a call to fflush().
|
|
566 |
if (lastIOCommand != QFSFileEnginePrivate::IOFlushCommand && !q->flush())
|
|
567 |
return false;
|
|
568 |
|
|
569 |
if (fh) {
|
|
570 |
// Buffered stdlib mode.
|
|
571 |
int ret;
|
|
572 |
do {
|
|
573 |
ret = QT_FSEEK(fh, QT_OFF_T(pos), SEEK_SET);
|
|
574 |
} while (ret == -1 && errno == EINTR);
|
|
575 |
|
|
576 |
if (ret == -1) {
|
|
577 |
q->setError(QFile::ReadError, qt_error_string(int(errno)));
|
|
578 |
return false;
|
|
579 |
}
|
|
580 |
} else {
|
|
581 |
// Unbuffered stdio mode.
|
|
582 |
if (QT_LSEEK(fd, pos, SEEK_SET) == -1) {
|
|
583 |
qWarning() << "QFile::at: Cannot set file position" << pos;
|
|
584 |
q->setError(QFile::PositionError, qt_error_string(errno));
|
|
585 |
return false;
|
|
586 |
}
|
|
587 |
}
|
|
588 |
return true;
|
|
589 |
}
|
|
590 |
|
|
591 |
/*!
|
|
592 |
\reimp
|
|
593 |
*/
|
|
594 |
int QFSFileEngine::handle() const
|
|
595 |
{
|
|
596 |
Q_D(const QFSFileEngine);
|
|
597 |
return d->nativeHandle();
|
|
598 |
}
|
|
599 |
|
|
600 |
/*!
|
|
601 |
\reimp
|
|
602 |
*/
|
|
603 |
qint64 QFSFileEngine::read(char *data, qint64 maxlen)
|
|
604 |
{
|
|
605 |
Q_D(QFSFileEngine);
|
|
606 |
|
|
607 |
// On Windows' stdlib implementation, the results of calling fread and
|
|
608 |
// fwrite are undefined if not called either in sequence, or if preceded
|
|
609 |
// with a call to fflush().
|
|
610 |
if (d->lastIOCommand != QFSFileEnginePrivate::IOReadCommand) {
|
|
611 |
flush();
|
|
612 |
d->lastIOCommand = QFSFileEnginePrivate::IOReadCommand;
|
|
613 |
}
|
|
614 |
|
|
615 |
return d->nativeRead(data, maxlen);
|
|
616 |
}
|
|
617 |
|
|
618 |
/*!
|
|
619 |
\internal
|
|
620 |
*/
|
|
621 |
qint64 QFSFileEnginePrivate::readFdFh(char *data, qint64 len)
|
|
622 |
{
|
|
623 |
Q_Q(QFSFileEngine);
|
|
624 |
|
|
625 |
// Buffered stdlib mode.
|
|
626 |
if (fh) {
|
|
627 |
qint64 readBytes = 0;
|
|
628 |
qint64 read = 0;
|
|
629 |
int retry = 0;
|
|
630 |
|
|
631 |
// Read in blocks of 4k to avoid platform limitations (Windows
|
|
632 |
// commonly bails out if you read or write too large blocks at once).
|
|
633 |
qint64 bytesToRead;
|
|
634 |
do {
|
|
635 |
if (retry == 1)
|
|
636 |
retry = 2;
|
|
637 |
|
|
638 |
bytesToRead = qMin<qint64>(4096, len - read);
|
|
639 |
do {
|
|
640 |
readBytes = fread(data + read, 1, size_t(bytesToRead), fh);
|
|
641 |
} while (readBytes == 0 && !feof(fh) && errno == EINTR);
|
|
642 |
|
|
643 |
if (readBytes > 0) {
|
|
644 |
read += readBytes;
|
|
645 |
} else if (!retry && feof(fh)) {
|
|
646 |
// Synchronize and try again (just once though).
|
|
647 |
if (++retry == 1)
|
|
648 |
QT_FSEEK(fh, QT_FTELL(fh), SEEK_SET);
|
|
649 |
}
|
|
650 |
} while (retry == 1 || (readBytes == bytesToRead && read < len));
|
|
651 |
|
|
652 |
// Return the number of bytes read, or if nothing was read, return -1
|
|
653 |
// if an error occurred, or 0 if we detected EOF.
|
|
654 |
if (read == 0) {
|
|
655 |
q->setError(QFile::ReadError, qt_error_string(int(errno)));
|
|
656 |
if (!feof(fh))
|
|
657 |
read = -1;
|
|
658 |
}
|
|
659 |
return read;
|
|
660 |
}
|
|
661 |
|
|
662 |
// Unbuffered stdio mode.
|
|
663 |
qint64 ret = 0;
|
|
664 |
if (len) {
|
|
665 |
int result;
|
|
666 |
qint64 read = 0;
|
|
667 |
errno = 0;
|
|
668 |
|
|
669 |
// Read in blocks of 4k to avoid platform limitations (Windows
|
|
670 |
// commonly bails out if you read or write too large blocks at once).
|
|
671 |
do {
|
|
672 |
qint64 bytesToRead = qMin<qint64>(4096, len - read);
|
|
673 |
do {
|
|
674 |
result = QT_READ(fd, data + read, int(bytesToRead));
|
|
675 |
} while (result == -1 && errno == EINTR);
|
|
676 |
if (result > 0)
|
|
677 |
read += result;
|
|
678 |
} while (result > 0 && read < len);
|
|
679 |
|
|
680 |
// Return the number of bytes read, or if nothing was read, return -1
|
|
681 |
// if an error occurred.
|
|
682 |
if (read > 0) {
|
|
683 |
ret += read;
|
|
684 |
} else if (read == 0 && result < 0) {
|
|
685 |
ret = -1;
|
|
686 |
q->setError(QFile::ReadError, qt_error_string(errno));
|
|
687 |
}
|
|
688 |
}
|
|
689 |
return ret;
|
|
690 |
}
|
|
691 |
|
|
692 |
/*!
|
|
693 |
\reimp
|
|
694 |
*/
|
|
695 |
qint64 QFSFileEngine::readLine(char *data, qint64 maxlen)
|
|
696 |
{
|
|
697 |
Q_D(QFSFileEngine);
|
|
698 |
|
|
699 |
// On Windows' stdlib implementation, the results of calling fread and
|
|
700 |
// fwrite are undefined if not called either in sequence, or if preceded
|
|
701 |
// with a call to fflush().
|
|
702 |
if (d->lastIOCommand != QFSFileEnginePrivate::IOReadCommand) {
|
|
703 |
flush();
|
|
704 |
d->lastIOCommand = QFSFileEnginePrivate::IOReadCommand;
|
|
705 |
}
|
|
706 |
|
|
707 |
return d->nativeReadLine(data, maxlen);
|
|
708 |
}
|
|
709 |
|
|
710 |
/*!
|
|
711 |
\internal
|
|
712 |
*/
|
|
713 |
qint64 QFSFileEnginePrivate::readLineFdFh(char *data, qint64 maxlen)
|
|
714 |
{
|
|
715 |
Q_Q(QFSFileEngine);
|
|
716 |
if (!fh)
|
|
717 |
return q->QAbstractFileEngine::readLine(data, maxlen);
|
|
718 |
|
|
719 |
QT_OFF_T oldPos = 0;
|
|
720 |
#ifdef Q_OS_WIN
|
|
721 |
bool seq = q->isSequential();
|
|
722 |
if (!seq)
|
|
723 |
#endif
|
|
724 |
oldPos = QT_FTELL(fh);
|
|
725 |
|
|
726 |
// QIODevice::readLine() passes maxlen - 1 to QFile::readLineData()
|
|
727 |
// because it has made space for the '\0' at the end of data. But fgets
|
|
728 |
// does the same, so we'd get two '\0' at the end - passing maxlen + 1
|
|
729 |
// solves this.
|
|
730 |
if (!fgets(data, int(maxlen + 1), fh)) {
|
|
731 |
if (!feof(fh))
|
|
732 |
q->setError(QFile::ReadError, qt_error_string(int(errno)));
|
|
733 |
return -1; // error
|
|
734 |
}
|
|
735 |
|
|
736 |
#ifdef Q_OS_WIN
|
|
737 |
if (seq)
|
|
738 |
return qstrlen(data);
|
|
739 |
#endif
|
|
740 |
|
|
741 |
qint64 lineLength = QT_FTELL(fh) - oldPos;
|
|
742 |
return lineLength > 0 ? lineLength : qstrlen(data);
|
|
743 |
}
|
|
744 |
|
|
745 |
/*!
|
|
746 |
\reimp
|
|
747 |
*/
|
|
748 |
qint64 QFSFileEngine::write(const char *data, qint64 len)
|
|
749 |
{
|
|
750 |
Q_D(QFSFileEngine);
|
|
751 |
|
|
752 |
// On Windows' stdlib implementation, the results of calling fread and
|
|
753 |
// fwrite are undefined if not called either in sequence, or if preceded
|
|
754 |
// with a call to fflush().
|
|
755 |
if (d->lastIOCommand != QFSFileEnginePrivate::IOWriteCommand) {
|
|
756 |
flush();
|
|
757 |
d->lastIOCommand = QFSFileEnginePrivate::IOWriteCommand;
|
|
758 |
}
|
|
759 |
|
|
760 |
return d->nativeWrite(data, len);
|
|
761 |
}
|
|
762 |
|
|
763 |
/*!
|
|
764 |
\internal
|
|
765 |
*/
|
|
766 |
qint64 QFSFileEnginePrivate::writeFdFh(const char *data, qint64 len)
|
|
767 |
{
|
|
768 |
Q_Q(QFSFileEngine);
|
|
769 |
qint64 result;
|
|
770 |
qint64 written = 0;
|
|
771 |
|
|
772 |
do {
|
|
773 |
// Write blocks of 4k to avoid platform limitations (Windows commonly
|
|
774 |
// bails out if you read or write too large blocks at once).
|
|
775 |
qint64 bytesToWrite = qMin<qint64>(4096, len - written);
|
|
776 |
if (fh) {
|
|
777 |
do {
|
|
778 |
// Buffered stdlib mode.
|
|
779 |
result = qint64(fwrite(data + written, 1, size_t(bytesToWrite), fh));
|
|
780 |
} while (result == 0 && errno == EINTR);
|
|
781 |
if (bytesToWrite > 0 && result == 0)
|
|
782 |
result = -1;
|
|
783 |
} else {
|
|
784 |
do {
|
|
785 |
// Unbuffered stdio mode.
|
|
786 |
result = QT_WRITE(fd, data + written, bytesToWrite);
|
|
787 |
} while (result == -1 && errno == EINTR);
|
|
788 |
}
|
|
789 |
if (result > 0)
|
|
790 |
written += qint64(result);
|
|
791 |
} while (written < len && result > 0);
|
|
792 |
|
|
793 |
// If we read anything, return that with success. Otherwise, set an error,
|
|
794 |
// and return the last return value.
|
|
795 |
if (result > 0)
|
|
796 |
return written;
|
|
797 |
q->setError(errno == ENOSPC ? QFile::ResourceError : QFile::WriteError, qt_error_string(errno));
|
|
798 |
return result;
|
|
799 |
}
|
|
800 |
|
|
801 |
/*!
|
|
802 |
\internal
|
|
803 |
*/
|
|
804 |
QAbstractFileEngine::Iterator *QFSFileEngine::beginEntryList(QDir::Filters filters, const QStringList &filterNames)
|
|
805 |
{
|
|
806 |
return new QFSFileEngineIterator(filters, filterNames);
|
|
807 |
}
|
|
808 |
|
|
809 |
/*!
|
|
810 |
\internal
|
|
811 |
*/
|
|
812 |
QAbstractFileEngine::Iterator *QFSFileEngine::endEntryList()
|
|
813 |
{
|
|
814 |
return 0;
|
|
815 |
}
|
|
816 |
|
|
817 |
/*!
|
|
818 |
\internal
|
|
819 |
*/
|
|
820 |
QStringList QFSFileEngine::entryList(QDir::Filters filters, const QStringList &filterNames) const
|
|
821 |
{
|
|
822 |
return QAbstractFileEngine::entryList(filters, filterNames);
|
|
823 |
}
|
|
824 |
|
|
825 |
/*!
|
|
826 |
\reimp
|
|
827 |
*/
|
|
828 |
bool QFSFileEngine::isSequential() const
|
|
829 |
{
|
|
830 |
Q_D(const QFSFileEngine);
|
|
831 |
if (d->is_sequential == 0)
|
|
832 |
d->is_sequential = d->nativeIsSequential() ? 1 : 2;
|
|
833 |
return d->is_sequential == 1;
|
|
834 |
}
|
|
835 |
|
|
836 |
/*!
|
|
837 |
\internal
|
|
838 |
*/
|
|
839 |
bool QFSFileEnginePrivate::isSequentialFdFh() const
|
|
840 |
{
|
|
841 |
if (!tried_stat)
|
|
842 |
doStat();
|
|
843 |
if (could_stat) {
|
|
844 |
#ifdef Q_OS_UNIX
|
|
845 |
return (st.st_mode & S_IFMT) != S_IFREG;
|
|
846 |
// ### WINDOWS!
|
|
847 |
#endif
|
|
848 |
}
|
|
849 |
return true;
|
|
850 |
}
|
|
851 |
|
|
852 |
/*!
|
|
853 |
\reimp
|
|
854 |
*/
|
|
855 |
bool QFSFileEngine::extension(Extension extension, const ExtensionOption *option, ExtensionReturn *output)
|
|
856 |
{
|
|
857 |
Q_D(QFSFileEngine);
|
|
858 |
if (extension == AtEndExtension && d->fh && isSequential())
|
|
859 |
return feof(d->fh);
|
|
860 |
|
|
861 |
if (extension == MapExtension) {
|
|
862 |
const MapExtensionOption *options = (MapExtensionOption*)(option);
|
|
863 |
MapExtensionReturn *returnValue = static_cast<MapExtensionReturn*>(output);
|
|
864 |
returnValue->address = d->map(options->offset, options->size, options->flags);
|
|
865 |
return (returnValue->address != 0);
|
|
866 |
}
|
|
867 |
if (extension == UnMapExtension) {
|
|
868 |
UnMapExtensionOption *options = (UnMapExtensionOption*)option;
|
|
869 |
return d->unmap(options->address);
|
|
870 |
}
|
|
871 |
|
|
872 |
return false;
|
|
873 |
}
|
|
874 |
|
|
875 |
/*!
|
|
876 |
\reimp
|
|
877 |
*/
|
|
878 |
bool QFSFileEngine::supportsExtension(Extension extension) const
|
|
879 |
{
|
|
880 |
Q_D(const QFSFileEngine);
|
|
881 |
if (extension == AtEndExtension && d->fh && isSequential())
|
|
882 |
return true;
|
|
883 |
if (extension == FastReadLineExtension && d->fh)
|
|
884 |
return true;
|
|
885 |
if (extension == FastReadLineExtension && d->fd != -1 && isSequential())
|
|
886 |
return true;
|
|
887 |
if (extension == UnMapExtension || extension == MapExtension)
|
|
888 |
return true;
|
|
889 |
return false;
|
|
890 |
}
|
|
891 |
|
|
892 |
/*! \fn bool QFSFileEngine::caseSensitive() const
|
|
893 |
Returns true for Windows, false for Unix.
|
|
894 |
*/
|
|
895 |
|
|
896 |
/*! \fn bool QFSFileEngine::copy(const QString ©Name)
|
|
897 |
|
|
898 |
For windows, copy the file to file \a copyName.
|
|
899 |
|
|
900 |
Not implemented for Unix.
|
|
901 |
*/
|
|
902 |
|
|
903 |
/*! \fn QString QFSFileEngine::currentPath(const QString &fileName)
|
|
904 |
For Unix, returns the current working directory for the file
|
|
905 |
engine.
|
|
906 |
|
|
907 |
For Windows, returns the canonicalized form of the current path used
|
|
908 |
by the file engine for the drive specified by \a fileName. On
|
|
909 |
Windows, each drive has its own current directory, so a different
|
|
910 |
path is returned for file names that include different drive names
|
|
911 |
(e.g. A: or C:).
|
|
912 |
|
|
913 |
\sa setCurrentPath()
|
|
914 |
*/
|
|
915 |
|
|
916 |
/*! \fn QFileInfoList QFSFileEngine::drives()
|
|
917 |
For Windows, returns the list of drives in the file system as a list
|
|
918 |
of QFileInfo objects. On unix, Mac OS X and Windows CE, only the
|
|
919 |
root path is returned. On Windows, this function returns all drives
|
|
920 |
(A:\, C:\, D:\, etc.).
|
|
921 |
|
|
922 |
For Unix, the list contains just the root path "/".
|
|
923 |
*/
|
|
924 |
|
|
925 |
/*! \fn QString QFSFileEngine::fileName(FileName file) const
|
|
926 |
\reimp
|
|
927 |
*/
|
|
928 |
|
|
929 |
/*! \fn QDateTime QFSFileEngine::fileTime(FileTime time) const
|
|
930 |
\reimp
|
|
931 |
*/
|
|
932 |
|
|
933 |
/*! \fn QString QFSFileEngine::homePath()
|
|
934 |
Returns the home path of the current user.
|
|
935 |
|
|
936 |
\sa rootPath()
|
|
937 |
*/
|
|
938 |
|
|
939 |
/*! \fn bool QFSFileEngine::isRelativePath() const
|
|
940 |
\reimp
|
|
941 |
*/
|
|
942 |
|
|
943 |
/*! \fn bool QFSFileEngine::link(const QString &newName)
|
|
944 |
|
|
945 |
Creates a link from the file currently specified by fileName() to
|
|
946 |
\a newName. What a link is depends on the underlying filesystem
|
|
947 |
(be it a shortcut on Windows or a symbolic link on Unix). Returns
|
|
948 |
true if successful; otherwise returns false.
|
|
949 |
*/
|
|
950 |
|
|
951 |
/*! \fn bool QFSFileEngine::mkdir(const QString &name, bool createParentDirectories) const
|
|
952 |
\reimp
|
|
953 |
*/
|
|
954 |
|
|
955 |
/*! \fn uint QFSFileEngine::ownerId(FileOwner own) const
|
|
956 |
In Unix, if stat() is successful, the \c uid is returned if
|
|
957 |
\a own is the owner. Otherwise the \c gid is returned. If stat()
|
|
958 |
is unsuccessful, -2 is reuturned.
|
|
959 |
|
|
960 |
For Windows, -2 is always returned.
|
|
961 |
*/
|
|
962 |
|
|
963 |
/*! \fn QString QFSFileEngine::owner(FileOwner own) const
|
|
964 |
\reimp
|
|
965 |
*/
|
|
966 |
|
|
967 |
/*! \fn bool QFSFileEngine::remove()
|
|
968 |
\reimp
|
|
969 |
*/
|
|
970 |
|
|
971 |
/*! \fn bool QFSFileEngine::rename(const QString &newName)
|
|
972 |
\reimp
|
|
973 |
*/
|
|
974 |
|
|
975 |
/*! \fn bool QFSFileEngine::rmdir(const QString &name, bool recurseParentDirectories) const
|
|
976 |
\reimp
|
|
977 |
*/
|
|
978 |
|
|
979 |
/*! \fn QString QFSFileEngine::rootPath()
|
|
980 |
Returns the root path.
|
|
981 |
|
|
982 |
\sa homePath()
|
|
983 |
*/
|
|
984 |
|
|
985 |
/*! \fn bool QFSFileEngine::setCurrentPath(const QString &path)
|
|
986 |
Sets the current path (e.g., for QDir), to \a path. Returns true if the
|
|
987 |
new path exists; otherwise this function does nothing, and returns false.
|
|
988 |
|
|
989 |
\sa currentPath()
|
|
990 |
*/
|
|
991 |
|
|
992 |
/*! \fn bool QFSFileEngine::setPermissions(uint perms)
|
|
993 |
\reimp
|
|
994 |
*/
|
|
995 |
|
|
996 |
/*! \fn bool QFSFileEngine::setSize(qint64 size)
|
|
997 |
\reimp
|
|
998 |
*/
|
|
999 |
|
|
1000 |
/*! \fn QString QFSFileEngine::tempPath()
|
|
1001 |
Returns the temporary path (i.e., a path in which it is safe
|
|
1002 |
to store temporary files).
|
|
1003 |
*/
|
|
1004 |
|
|
1005 |
QT_END_NAMESPACE
|
|
1006 |
|
|
1007 |
#endif // QT_NO_FSFILEENGINE
|