C++ QFileSystemEntry函数代码示例

//static
QFileSystemEntry QFileSystemEngine::absoluteName(const QFileSystemEntry &entry)
{
    if (entry.isAbsolute() && entry.isClean())
        return entry;

    QByteArray orig = entry.nativeFilePath();
    QByteArray result;
    if (orig.isEmpty() || !orig.startsWith('/')) {
        QFileSystemEntry cur(currentPath());
        result = cur.nativeFilePath();
    }
    if (!orig.isEmpty() && !(orig.length() == 1 && orig[0] == '.')) {
        if (!result.isEmpty() && !result.endsWith('/'))
            result.append('/');
        result.append(orig);
    }

    if (result.length() == 1 && result[0] == '/')
        return QFileSystemEntry(result, QFileSystemEntry::FromNativePath());
    const bool isDir = result.endsWith('/');

    /* as long as QDir::cleanPath() operates on a QString we have to convert to a string here.
     * ideally we never convert to a string since that loses information. Please fix after
     * we get a QByteArray version of QDir::cleanPath()
     */
    QFileSystemEntry resultingEntry(result, QFileSystemEntry::FromNativePath());
    QString stringVersion = QDir::cleanPath(resultingEntry.filePath());
    if (isDir)
        stringVersion.append(QLatin1Char('/'));
    return QFileSystemEntry(stringVersion);
}

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
}

bool QFileSystemIterator::advance(QFileSystemEntry &fileEntry, QFileSystemMetaData &metaData)
{
    //1st time, lastError is result of dirHandle.Open(), entries.Count() is 0 and entryIndex is -1 so initial read is triggered
    //subsequent times, read is triggered each time we reach the end of the entry list
    //final time, lastError is KErrEof so we don't need to read anymore.
    ++entryIndex;
    if (lastError == KErrNone && entryIndex >= entries.Count()) {
        lastError = dirHandle.Read(entries);
        entryIndex = 0;
    }

    //each call to advance() gets the next entry from the entry list.
    //from the final (or only) read call, KErrEof is returned together with a full buffer so we still need to go through the list
    if ((lastError == KErrNone || lastError == KErrEof) && entryIndex < entries.Count()) {
        Q_ASSERT(entryIndex >= 0);
        const TEntry &entry(entries[entryIndex]);
        fileEntry = QFileSystemEntry(nativePath + qt_TDesC2QString(entry.iName), QFileSystemEntry::FromNativePath());
        metaData.fillFromTEntry(entry);
        return true;
    }

    //TODO: error reporting, to allow user to distinguish empty directory from error condition.

    return false;
}

/*!
    Opens the file descriptor specified by \a file in the mode given by
    \a openMode. Returns true on success; otherwise returns false.

    The \a handleFlags argument specifies whether the file handle will be
    closed by Qt. See the QFile::FileHandleFlags documentation for more
    information.
*/
bool QFSFileEngine::open(QIODevice::OpenMode openMode, const RFile &file, QFile::FileHandleFlags handleFlags)
{
    Q_D(QFSFileEngine);

    // Append implies WriteOnly.
    if (openMode & QFile::Append)
        openMode |= QFile::WriteOnly;

    // WriteOnly implies Truncate if neither ReadOnly nor Append are sent.
    if ((openMode & QFile::WriteOnly) && !(openMode & (QFile::ReadOnly | QFile::Append)))
        openMode |= QFile::Truncate;

    d->openMode = openMode;
    d->lastFlushFailed = false;
    d->closeFileHandle = (handleFlags & QFile::AutoCloseHandle);
    d->fileEntry.clear();
    d->fh = 0;
    d->fd = -1;
    d->tried_stat = 0;

#ifdef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API
    //RFile64 adds only functions to RFile, no data members
    d->symbianFile = static_cast<const RFile64&>(file);
#else
    d->symbianFile = file;
#endif
    TInt ret;
    d->symbianFilePos = 0;
    if (openMode & QFile::Append) {
        // Seek to the end when in Append mode.
        ret = d->symbianFile.Size(d->symbianFilePos);
    } else {
        // Seek to current otherwise
        ret = d->symbianFile.Seek(ESeekCurrent, d->symbianFilePos);
    }

    if (ret != KErrNone) {
        setError(QFile::OpenError, QSystemError(ret, QSystemError::NativeError).toString());

        d->openMode = QIODevice::NotOpen;
#ifdef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API
        d->symbianFile = RFile64();
#else
        d->symbianFile = RFile();
#endif
        return false;
    }

    // Extract filename (best effort)
    TFileName fn;
    TInt err = d->symbianFile.FullName(fn);
    if (err == KErrNone)
        d->fileEntry = QFileSystemEntry(qt_TDesC2QString(fn), QFileSystemEntry::FromNativePath());
    else
        d->fileEntry.clear();

    return true;
}

bool QFSFileEngine::rename(const QString &newName)
{
    Q_D(QFSFileEngine);
    QSystemError error;
    bool ret = QFileSystemEngine::renameFile(d->fileEntry, QFileSystemEntry(newName), error);
    if (!ret)
        setError(QFile::RenameError, error.toString());
    return ret;
}

bool QFSFileEngineIterator::hasNext() const
{
    if (!done && !nativeIterator) {
        nativeIterator.reset(new QFileSystemIterator(QFileSystemEntry(path()),
                    filters(), nameFilters()));
        advance();
    }

    return !done;
}

//static
QFileSystemEntry QFileSystemEngine::currentPath()
{
    TFileName fn;
    QFileSystemEntry ret;
    TInt r = qt_s60GetRFs().SessionPath(fn);
    if(r == KErrNone) {
        //remove terminating slash from non root paths (session path is clean, absolute and always ends in a \)
        if(fn.Length() > 3 && fn[fn.Length() - 1] == '\\')
            fn.SetLength(fn.Length() - 1);
        ret = QFileSystemEntry(qt_TDesC2QString(fn), QFileSystemEntry::FromNativePath());
    }
    return ret;
}

//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 _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 == QLatin1Char('/'))
            break;

        if (ch == QLatin1Char(':')) {
            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) % QLatin1Char('/') % 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);
}

//static
QFileSystemEntry QFileSystemEngine::absoluteName(const QFileSystemEntry &entry)
{
    QString orig = entry.filePath();
    const bool isAbsolute = entry.isAbsolute();
    const bool isDirty = !entry.isClean();
    if (isAbsolute && !isDirty)
        return entry;

    const bool isRelative = entry.isRelative();
    const bool needsDrive = (!orig.isEmpty() && orig.at(0).unicode() == '/');
    const bool isDriveLetter = !needsDrive && !isAbsolute && !isRelative && orig.length() == 2;
    const bool isDriveRelative = !needsDrive && !isAbsolute && !isRelative && orig.length() > 2;

    QString result;
    if (needsDrive || isDriveLetter || isDriveRelative || !isAbsolute || orig.isEmpty()) {
        QFileSystemEntry cur(currentPath());
        if(needsDrive)
            result = cur.filePath().left(2);
        else if(isDriveRelative && cur.filePath().at(0) != orig.at(0))
            result = orig.left(2); // for BC, see tst_QFileInfo::absolutePath(<not current drive>:my.dll)
        else
            result = cur.filePath();
        if(isDriveLetter) {
            result[0] = orig.at(0); //copy drive letter
            orig.clear();
        }
        if(isDriveRelative) {
            orig = orig.mid(2); //discard the drive specifier from orig
        }
    }
    if (!orig.isEmpty() && !(orig.length() == 1 && orig.at(0).unicode() == '.')) {
        if (!result.isEmpty() && !result.endsWith(QLatin1Char('/')))
            result.append(QLatin1Char('/'));
        result.append(orig);
    }

    return QFileSystemEntry(symbianCleanAbsolutePath(result), QFileSystemEntry::FromInternalPath());
}

//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
}

//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
}

/*!
    \reimp
*/
void QFSFileEngine::setFileName(const QString &file)
{
    Q_D(QFSFileEngine);
    d->init();
    d->fileEntry = QFileSystemEntry(file);
}

/*!
    Constructs a QFSFileEngine for the file name \a file.
*/
QFSFileEngine::QFSFileEngine(const QString &file)
    : QAbstractFileEngine(*new QFSFileEnginePrivate)
{
    Q_D(QFSFileEngine);
    d->fileEntry = QFileSystemEntry(file);
}