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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qfilesystemengine_p.h"
#include <QtCore/qdir.h>
#include <QtCore/qset.h>
#include <QtCore/qstringbuilder.h>
#include <QtCore/private/qabstractfileengine_p.h>
#ifdef QT_BUILD_CORE_LIB
#include <QtCore/private/qresource_p.h>
#endif
#include <QtCore/private/qduplicatetracker_p.h>
QT_BEGIN_NAMESPACE
/*!
\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(u'/');
QString tmpPath = path;
int separatorPos = 0;
QSet<QString> nonSymlinks;
QDuplicateTracker<QString> known;
(void)known.hasSeen(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) == u':' && 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 (!nonSymlinks.contains(prefix)) {
fi.setFile(prefix);
if (fi.isSymLink()) {
QString target = fi.symLinkTarget();
if (separatorPos != -1) {
if (fi.isDir() && !target.endsWith(slash))
target.append(slash);
target.append(QStringView{tmpPath}.mid(separatorPos));
}
tmpPath = QDir::cleanPath(target);
separatorPos = 0;
if (known.hasSeen(tmpPath))
return QString();
} else {
nonSymlinks.insert(prefix);
}
}
} while (separatorPos != -1);
return QDir::cleanPath(tmpPath);
}
static inline bool _q_checkEntry(QFileSystemEntry &entry, QFileSystemMetaData &data, bool resolvingEntry)
{
if (resolvingEntry) {
if (!QFileSystemEngine::fillMetaData(entry, data, QFileSystemMetaData::ExistsAttribute)
|| !data.exists()) {
data.clear();
return false;
}
}
return true;
}
static inline bool _q_checkEntry(QAbstractFileEngine *&engine, bool resolvingEntry)
{
if (resolvingEntry) {
if (!(engine->fileFlags(QAbstractFileEngine::FlagsMask) & QAbstractFileEngine::ExistsFlag)) {
delete engine;
engine = nullptr;
return false;
}
}
return true;
}
static bool _q_resolveEntryAndCreateLegacyEngine_recursive(QFileSystemEntry &entry, QFileSystemMetaData &data,
QAbstractFileEngine *&engine, bool resolvingEntry = false)
{
QString const &filePath = entry.filePath();
if ((engine = qt_custom_file_engine_handler_create(filePath)))
return _q_checkEntry(engine, resolvingEntry);
#if defined(QT_BUILD_CORE_LIB)
for (int prefixSeparator = 0; prefixSeparator < filePath.size(); ++prefixSeparator) {
QChar const ch = filePath[prefixSeparator];
if (ch == u'/')
break;
if (ch == u':') {
if (prefixSeparator == 0) {
engine = new QResourceFileEngine(filePath);
return _q_checkEntry(engine, resolvingEntry);
}
if (prefixSeparator == 1)
break;
const QStringList &paths = QDir::searchPaths(filePath.left(prefixSeparator));
for (int i = 0; i < paths.count(); i++) {
entry = QFileSystemEntry(QDir::cleanPath(
paths.at(i) % u'/' % QStringView{filePath}.mid(prefixSeparator + 1)));
// Recurse!
if (_q_resolveEntryAndCreateLegacyEngine_recursive(entry, data, engine, true))
return true;
}
// entry may have been clobbered at this point.
return false;
}
// There's no need to fully validate the prefix here. Consulting the
// unicode tables could be expensive and validation is already
// performed in QDir::setSearchPaths.
//
// if (!ch.isLetterOrNumber())
// break;
}
#endif // defined(QT_BUILD_CORE_LIB)
return _q_checkEntry(entry, data, resolvingEntry);
}
/*!
\internal
Resolves the \a entry (see QDir::searchPaths) and returns an engine for
it, but never a QFSFileEngine.
Returns a file engine that can be used to access the entry. Returns 0 if
QFileSystemEngine API should be used to query and interact with the file
system object.
*/
QAbstractFileEngine *QFileSystemEngine::resolveEntryAndCreateLegacyEngine(
QFileSystemEntry &entry, QFileSystemMetaData &data) {
QFileSystemEntry copy = entry;
QAbstractFileEngine *engine = nullptr;
if (_q_resolveEntryAndCreateLegacyEngine_recursive(copy, data, engine))
// Reset entry to resolved copy.
entry = copy;
else
data.clear();
return engine;
}
//static
QString QFileSystemEngine::resolveUserName(const QFileSystemEntry &entry, QFileSystemMetaData &metaData)
{
#if defined(Q_OS_WIN)
Q_UNUSED(metaData);
return QFileSystemEngine::owner(entry, QAbstractFileEngine::OwnerUser);
#else //(Q_OS_UNIX)
if (!metaData.hasFlags(QFileSystemMetaData::UserId))
QFileSystemEngine::fillMetaData(entry, metaData, QFileSystemMetaData::UserId);
if (!metaData.exists())
return QString();
return resolveUserName(metaData.userId());
#endif
}
//static
QString QFileSystemEngine::resolveGroupName(const QFileSystemEntry &entry, QFileSystemMetaData &metaData)
{
#if defined(Q_OS_WIN)
Q_UNUSED(metaData);
return QFileSystemEngine::owner(entry, QAbstractFileEngine::OwnerGroup);
#else //(Q_OS_UNIX)
if (!metaData.hasFlags(QFileSystemMetaData::GroupId))
QFileSystemEngine::fillMetaData(entry, metaData, QFileSystemMetaData::GroupId);
if (!metaData.exists())
return QString();
return resolveGroupName(metaData.groupId());
#endif
}
//static
QFileSystemEntry QFileSystemEngine::getJunctionTarget(const QFileSystemEntry &link,
QFileSystemMetaData &data)
{
#if defined(Q_OS_WIN)
return junctionTarget(link, data);
#else
Q_UNUSED(link);
Q_UNUSED(data);
return {};
#endif
}
QT_END_NAMESPACE
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