C++ QFileSystemEntry::isEmpty方法代码示例

void tst_QFileSystemEntry::defaultCtor()
{
    QFileSystemEntry entry;

    QVERIFY(entry.filePath().isNull());
    QVERIFY(entry.nativeFilePath().isNull());

    QVERIFY(entry.fileName().isNull());
    QCOMPARE(entry.path(), QString("."));

    QVERIFY(entry.baseName().isNull());
    QVERIFY(entry.completeBaseName().isNull());
    QVERIFY(entry.suffix().isNull());
    QVERIFY(entry.completeSuffix().isNull());

    QVERIFY(!entry.isAbsolute());
    QVERIFY(entry.isRelative());

    QVERIFY(entry.isClean());

#if defined(Q_OS_WIN)
    QVERIFY(!entry.isDriveRoot());
#endif
    QVERIFY(!entry.isRoot());

    QVERIFY(entry.isEmpty());
}

/*!
    \internal

    Returns the stdlib open string corresponding to a QIODevice::OpenMode.
*/
static inline QByteArray openModeToFopenMode(QIODevice::OpenMode flags, const QFileSystemEntry &fileEntry,
        QFileSystemMetaData &metaData)
{
    QByteArray mode;
    if ((flags & QIODevice::ReadOnly) && !(flags & QIODevice::Truncate)) {
        mode = "rb";
        if (flags & QIODevice::WriteOnly) {
            metaData.clearFlags(QFileSystemMetaData::FileType);
            if (!fileEntry.isEmpty()
                    && QFileSystemEngine::fillMetaData(fileEntry, metaData, QFileSystemMetaData::FileType)
                    && metaData.isFile()) {
                mode += '+';
            } else {
                mode = "wb+";
            }
        }
    } else if (flags & QIODevice::WriteOnly) {
        mode = "wb";
        if (flags & QIODevice::ReadOnly)
            mode += '+';
    }
    if (flags & QIODevice::Append) {
        mode = "ab";
        if (flags & QIODevice::ReadOnly)
            mode += '+';
    }

#if defined(__GLIBC__) && (__GLIBC__ * 0x100 + __GLIBC_MINOR__) >= 0x0207
    // must be glibc >= 2.7
    mode += 'e';
#endif

    return mode;
}

QFileSystemEntry QFileSystemEngine::currentPath()
{
    QFileSystemEntry result;
    QT_STATBUF st;
    if (QT_STAT(".", &st) == 0) {
#if defined(__GLIBC__) && !defined(PATH_MAX)
        char *currentName = ::get_current_dir_name();
        if (currentName) {
            result = QFileSystemEntry(QByteArray(currentName), QFileSystemEntry::FromNativePath());
            ::free(currentName);
        }
#else
        char currentName[PATH_MAX+1];
        if (::getcwd(currentName, PATH_MAX))
            result = QFileSystemEntry(QByteArray(currentName), QFileSystemEntry::FromNativePath());
# if defined(QT_DEBUG)
        if (result.isEmpty())
            qWarning("QFSFileEngine::currentPath: getcwd() failed");
# endif
#endif
    } else {
# if defined(QT_DEBUG)
        qWarning("QFSFileEngine::currentPath: stat(\".\") failed");
# endif
    }
    return result;
}

QFileSystemEntry QFileSystemEngine::currentPath()
{
    QFileSystemEntry result;
    QT_STATBUF st;
    if (QT_STAT(".", &st) == 0) {
#if defined(__GLIBC__) && !defined(PATH_MAX)
        char *currentName = ::get_current_dir_name();
        if (currentName) {
            result = QFileSystemEntry(QByteArray(currentName), QFileSystemEntry::FromNativePath());
            ::free(currentName);
        }
#else
        char currentName[PATH_MAX+1];
        if (::getcwd(currentName, PATH_MAX)) {
#if defined(Q_OS_VXWORKS) && defined(VXWORKS_VXSIM)
            QByteArray dir(currentName);
            if (dir.indexOf(':') < dir.indexOf('/'))
                dir.remove(0, dir.indexOf(':')+1);

            qstrncpy(currentName, dir.constData(), PATH_MAX);
#endif
            result = QFileSystemEntry(QByteArray(currentName), QFileSystemEntry::FromNativePath());
        }
# if defined(QT_DEBUG)
        if (result.isEmpty())
            qWarning("QFileSystemEngine::currentPath: getcwd() failed");
# endif
#endif
    } else {
# if defined(QT_DEBUG)
        qWarning("QFileSystemEngine::currentPath: stat(\".\") failed");
# endif
    }
    return result;
}

//static
QFileSystemEntry QFileSystemEngine::canonicalName(const QFileSystemEntry &entry, QFileSystemMetaData &data)
{
    if (entry.isEmpty() || entry.isRoot())
        return entry;

#if !defined(Q_OS_MAC) && _POSIX_VERSION < 200809L
    // realpath(X,0) is not supported
    Q_UNUSED(data);
    return QFileSystemEntry(slowCanonicalized(absoluteName(entry).filePath()));
#else
    char *ret = 0;
# if defined(Q_OS_MAC)
#  if !defined(QT_NO_CORESERVICES)
    // Mac OS X 10.5.x doesn't support the realpath(X,0) extension we use here.
    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_6) {
        ret = realpath(entry.nativeFilePath().constData(), (char*)0);
    } else {
        // on 10.5 we can use FSRef to resolve the file path.
        QString path = QDir::cleanPath(entry.filePath());
        FSRef fsref;
        if (FSPathMakeRef((const UInt8 *)path.toUtf8().data(), &fsref, 0) == noErr) {
            CFURLRef urlref = CFURLCreateFromFSRef(NULL, &fsref);
            CFStringRef canonicalPath = CFURLCopyFileSystemPath(urlref, kCFURLPOSIXPathStyle);
            QString ret = QCFString::toQString(canonicalPath);
            CFRelease(canonicalPath);
            CFRelease(urlref);
            return QFileSystemEntry(ret);
        }
    }
#  else
    ret = (char*)malloc(PATH_MAX);
    realpath(entry.nativeFilePath().constData(), (char*)ret);
#  endif //!defined(QT_NO_CORESERVICES)
#  else
#ifdef Q_OS_ANDROID
    ret = (char*)malloc(PATH_MAX);
    memset(ret, 0, PATH_MAX);
    ret = realpath(entry.nativeFilePath().constData(), ret);
#else
    ret = realpath(entry.nativeFilePath().constData(), (char*)0);
#endif
    ret = realpath(entry.nativeFilePath().constData(), (char*)0);
# endif //defined(Q_OS_MAC)
    if (ret) {
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags |= QFileSystemMetaData::ExistsAttribute;
        QString canonicalPath = QDir::cleanPath(QString::fromLocal8Bit(ret));
        free(ret);
        return QFileSystemEntry(canonicalPath);
    } else if (errno == ENOENT) { // file doesn't exist
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags &= ~(QFileSystemMetaData::ExistsAttribute);
        return QFileSystemEntry();
    }
    return entry;
#endif
}

//static
QFileSystemEntry QFileSystemEngine::canonicalName(const QFileSystemEntry &entry, QFileSystemMetaData &data)
{
    if (entry.isEmpty() || entry.isRoot())
        return entry;

    QFileSystemEntry result = absoluteName(entry);
    if (!data.hasFlags(QFileSystemMetaData::ExistsAttribute))
        fillMetaData(result, data, QFileSystemMetaData::ExistsAttribute);
    if (!data.exists()) {
        // file doesn't exist
        return QFileSystemEntry();
    } else {
        return result;
    }
}

//static
bool QFileSystemEngine::fillMetaData(const QFileSystemEntry &entry, QFileSystemMetaData &data, QFileSystemMetaData::MetaDataFlags what)
{
    if (what & QFileSystemMetaData::SymbianTEntryFlags) {
        RFs& fs(qt_s60GetRFs());
        TInt err;
        QFileSystemEntry absentry(absoluteName(entry));
        if (entry.isEmpty()) {
            err = KErrNotFound;
        } else if (absentry.isRoot()) {
            //Root directories don't have an entry, and Entry() returns KErrBadName.
            //Therefore get information about the volume instead.
            TInt drive;
            err = RFs::CharToDrive(TChar(absentry.nativeFilePath().at(0).unicode()), drive);
            if (!err) {
                TVolumeInfo info;
                err = fs.Volume(info, drive);
                if (!err)
                    data.fillFromVolumeInfo(info);
            }
        } else {
            TEntry ent;
            err = fs.Entry(qt_QString2TPtrC(absentry.nativeFilePath()), ent);
            if (!err)
                data.fillFromTEntry(ent);
        }
        if (err) {
            data.size_ = 0;
            data.modificationTime_ = TTime(0);
            data.entryFlags &= ~(QFileSystemMetaData::SymbianTEntryFlags);
        }
        //files in /sys/bin on any drive are executable, even though we don't normally have permission to check whether they exist or not
        if(absentry.filePath().midRef(1,10).compare(QLatin1String(":/sys/bin/"), Qt::CaseInsensitive) == 0)
            data.entryFlags |= QFileSystemMetaData::ExecutePermissions;
    }
    return data.hasFlags(what);
}

//static
QFileSystemEntry QFileSystemEngine::canonicalName(const QFileSystemEntry &entry, QFileSystemMetaData &data)
{
    if (entry.isEmpty() || entry.isRoot())
        return entry;

#if !defined(Q_OS_MAC) && !defined(Q_OS_QNX) && !defined(Q_OS_ANDROID) && _POSIX_VERSION < 200809L
    // realpath(X,0) is not supported
    Q_UNUSED(data);
    return QFileSystemEntry(slowCanonicalized(absoluteName(entry).filePath()));
#else
    char *ret = 0;
# if defined(Q_OS_MACX)
    // When using -mmacosx-version-min=10.4, we get the legacy realpath implementation,
    // which does not work properly with the realpath(X,0) form. See QTBUG-28282.
    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_6) {
        ret = (char*)malloc(PATH_MAX + 1);
        if (ret && realpath(entry.nativeFilePath().constData(), (char*)ret) == 0) {
            const int savedErrno = errno; // errno is checked below, and free() might change it
            free(ret);
            errno = savedErrno;
            ret = 0;
        }
    } else {
        // on 10.5 we can use FSRef to resolve the file path.
        QString path = QDir::cleanPath(entry.filePath());
        FSRef fsref;
        if (FSPathMakeRef((const UInt8 *)path.toUtf8().data(), &fsref, 0) == noErr) {
            CFURLRef urlref = CFURLCreateFromFSRef(NULL, &fsref);
            CFStringRef canonicalPath = CFURLCopyFileSystemPath(urlref, kCFURLPOSIXPathStyle);
            QString ret = QCFString::toQString(canonicalPath);
            CFRelease(canonicalPath);
            CFRelease(urlref);
            return QFileSystemEntry(ret);
        }
    }
# else
#  if _POSIX_VERSION >= 200801L
    ret = realpath(entry.nativeFilePath().constData(), (char*)0);
#  else
    ret = (char*)malloc(PATH_MAX + 1);
    if (realpath(entry.nativeFilePath().constData(), (char*)ret) == 0) {
        const int savedErrno = errno; // errno is checked below, and free() might change it
        free(ret);
        errno = savedErrno;
        ret = 0;
    }
#  endif
# endif
    if (ret) {
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags |= QFileSystemMetaData::ExistsAttribute;
        QString canonicalPath = QDir::cleanPath(QString::fromLocal8Bit(ret));
        free(ret);
        return QFileSystemEntry(canonicalPath);
    } else if (errno == ENOENT) { // file doesn't exist
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags &= ~(QFileSystemMetaData::ExistsAttribute);
        return QFileSystemEntry();
    }
    return entry;
#endif
}

//static
QFileSystemEntry QFileSystemEngine::canonicalName(const QFileSystemEntry &entry, QFileSystemMetaData &data)
{
    if (entry.isEmpty() || entry.isRoot())
        return entry;

#if !defined(Q_OS_MAC) && !defined(Q_OS_QNX) && !defined(Q_OS_ANDROID) && !defined(Q_OS_HAIKU) && _POSIX_VERSION < 200809L
    // realpath(X,0) is not supported
    Q_UNUSED(data);
    return QFileSystemEntry(slowCanonicalized(absoluteName(entry).filePath()));
#else
    char *ret = 0;
# if defined(Q_OS_DARWIN)
    ret = (char*)malloc(PATH_MAX + 1);
    if (ret && realpath(entry.nativeFilePath().constData(), (char*)ret) == 0) {
        const int savedErrno = errno; // errno is checked below, and free() might change it
        free(ret);
        errno = savedErrno;
        ret = 0;
    }
# elif defined(Q_OS_ANDROID)
    // On some Android versions, realpath() will return a path even if it does not exist
    // To work around this, we check existence in advance.
    if (!data.hasFlags(QFileSystemMetaData::ExistsAttribute))
        fillMetaData(entry, data, QFileSystemMetaData::ExistsAttribute);

    if (!data.exists()) {
        ret = 0;
        errno = ENOENT;
    } else {
        ret = (char*)malloc(PATH_MAX + 1);
        if (realpath(entry.nativeFilePath().constData(), (char*)ret) == 0) {
            const int savedErrno = errno; // errno is checked below, and free() might change it
            free(ret);
            errno = savedErrno;
            ret = 0;
        }
    }

# else
#  if _POSIX_VERSION >= 200801L
    ret = realpath(entry.nativeFilePath().constData(), (char*)0);
#  else
    ret = (char*)malloc(PATH_MAX + 1);
    if (realpath(entry.nativeFilePath().constData(), (char*)ret) == 0) {
        const int savedErrno = errno; // errno is checked below, and free() might change it
        free(ret);
        errno = savedErrno;
        ret = 0;
    }
#  endif
# endif
    if (ret) {
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags |= QFileSystemMetaData::ExistsAttribute;
        QString canonicalPath = QDir::cleanPath(QString::fromLocal8Bit(ret));
        free(ret);
        return QFileSystemEntry(canonicalPath);
    } else if (errno == ENOENT) { // file doesn't exist
        data.knownFlagsMask |= QFileSystemMetaData::ExistsAttribute;
        data.entryFlags &= ~(QFileSystemMetaData::ExistsAttribute);
        return QFileSystemEntry();
    }
    return entry;
#endif
}