C++ QFileSystemEntry类代码示例

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;
}

QString QFSFileEngine::fileName(FileName file) const
{
    Q_D(const QFSFileEngine);
    if (file == BundleName) {
        return QFileSystemEngine::bundleName(d->fileEntry);
    } else if (file == BaseName) {
        return d->fileEntry.fileName();
    } else if (file == PathName) {
        return d->fileEntry.path();
    } else if (file == AbsoluteName || file == AbsolutePathName) {
        QFileSystemEntry entry(QFileSystemEngine::absoluteName(d->fileEntry));
        if (file == AbsolutePathName) {
            return entry.path();
        }
        return entry.filePath();
    } else if (file == CanonicalName || file == CanonicalPathName) {
        QFileSystemEntry entry(QFileSystemEngine::canonicalName(d->fileEntry, d->metaData));
        if (file == CanonicalPathName)
            return entry.path();
        return entry.filePath();
    } else if (file == LinkName) {
        if (d->isSymlink()) {
            QFileSystemEntry entry = QFileSystemEngine::getLinkTarget(d->fileEntry, d->metaData);
            return entry.filePath();
        }
        return QString();
    }
    return d->fileEntry.filePath();
}

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;
}

//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);
}

//static
bool QFileSystemEngine::renameFile(const QFileSystemEntry &source, const QFileSystemEntry &target, QSystemError &error)
{
    if (::rename(source.nativeFilePath().constData(), target.nativeFilePath().constData()) == 0)
        return true;
    error = QSystemError(errno, QSystemError::StandardLibraryError);
    return false;
}

static bool isPackage(const QFileSystemMetaData &data, const QFileSystemEntry &entry)
{
    if (!data.isDirectory())
        return false;

    QFileInfo info(entry.filePath());
    QString suffix = info.suffix();

    if (suffix.length() > 0) {
        // First step: is the extension known ?
        CFStringRef extensionRef = QCFString::toCFStringRef(suffix);
        CFStringRef uniformTypeIdentifier = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, extensionRef, NULL);
        if (UTTypeConformsTo(uniformTypeIdentifier, kUTTypeBundle))
            return true;

        // Second step: check if an application knows the package type
        CFStringRef path = QCFString::toCFStringRef(entry.filePath());
        QCFType<CFURLRef> url = CFURLCreateWithFileSystemPath(0, path, kCFURLPOSIXPathStyle, true);

        UInt32 type, creator;
        // Well created packages have the PkgInfo file
        if (CFBundleGetPackageInfoInDirectory(url, &type, &creator))
            return true;

        // Find if an application other than Finder claims to know how to handle the package
        QCFType<CFURLRef> application;
        LSGetApplicationForURL(url,
                               kLSRolesEditor|kLSRolesViewer|kLSRolesViewer,
                               NULL,
                               &application);

        if (application) {
            QCFType<CFBundleRef> bundle = CFBundleCreate(kCFAllocatorDefault, application);
            CFStringRef identifier = CFBundleGetIdentifier(bundle);
            QString applicationId = QCFString::toQString(identifier);
            if (applicationId != QLatin1String("com.apple.finder"))
                return true;
        }
    }

    // Third step: check if the directory has the package bit set
    FSRef packageRef;
    FSPathMakeRef((UInt8 *)entry.nativeFilePath().constData(), &packageRef, NULL);

    FSCatalogInfo catalogInfo;
    FSGetCatalogInfo(&packageRef,
                     kFSCatInfoFinderInfo,
                     &catalogInfo,
                     NULL,
                     NULL,
                     NULL);

    FolderInfo *folderInfo = reinterpret_cast<FolderInfo *>(catalogInfo.finderInfo);
    return folderInfo->finderFlags & kHasBundle;
}

//static
QByteArray QFileSystemEngine::id(const QFileSystemEntry &entry)
{
    struct stat statResult;
    if (stat(entry.nativeFilePath().constData(), &statResult)) {
        qErrnoWarning("stat() failed for '%s'", entry.nativeFilePath().constData());
        return QByteArray();
    }
    QByteArray result = QByteArray::number(quint64(statResult.st_dev), 16);
    result += ':';
    result += QByteArray::number(quint64(statResult.st_ino));
    return result;
}

//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;
    }
}

QT_BEGIN_NAMESPACE

#if defined(Q_OS_DARWIN)
static inline bool hasResourcePropertyFlag(const QFileSystemMetaData &data,
                                           const QFileSystemEntry &entry,
                                           CFStringRef key)
{
    QCFString path = CFStringCreateWithFileSystemRepresentation(0,
        entry.nativeFilePath().constData());
    if (!path)
        return false;

    QCFType<CFURLRef> url = CFURLCreateWithFileSystemPath(0, path, kCFURLPOSIXPathStyle,
        data.hasFlags(QFileSystemMetaData::DirectoryType));
    if (!url)
        return false;

    CFBooleanRef value;
    if (CFURLCopyResourcePropertyForKey(url, key, &value, NULL)) {
        if (value == kCFBooleanTrue)
            return true;
    }

    return false;
}

//static
bool QFileSystemEngine::setPermissions(const QFileSystemEntry &entry, QFile::Permissions permissions, QSystemError &error, QFileSystemMetaData *data)
{
    mode_t mode = 0;
    if (permissions & (QFile::ReadOwner | QFile::ReadUser))
        mode |= S_IRUSR;
    if (permissions & (QFile::WriteOwner | QFile::WriteUser))
        mode |= S_IWUSR;
    if (permissions & (QFile::ExeOwner | QFile::ExeUser))
        mode |= S_IXUSR;
    if (permissions & QFile::ReadGroup)
        mode |= S_IRGRP;
    if (permissions & QFile::WriteGroup)
        mode |= S_IWGRP;
    if (permissions & QFile::ExeGroup)
        mode |= S_IXGRP;
    if (permissions & QFile::ReadOther)
        mode |= S_IROTH;
    if (permissions & QFile::WriteOther)
        mode |= S_IWOTH;
    if (permissions & QFile::ExeOther)
        mode |= S_IXOTH;

    bool success = ::chmod(entry.nativeFilePath().constData(), mode) == 0;
    if (success && data) {
        data->entryFlags &= ~QFileSystemMetaData::Permissions;
        data->entryFlags |= QFileSystemMetaData::MetaDataFlag(uint(permissions));
        data->knownFlagsMask |= QFileSystemMetaData::Permissions;
    }
    if (!success)
        error = QSystemError(errno, QSystemError::StandardLibraryError);
    return success;
}

//static
bool QFileSystemEngine::createDirectory(const QFileSystemEntry &entry, bool createParents)
{
    QString dirName = entry.filePath();
    if (createParents) {
        dirName = QDir::cleanPath(dirName);
        for (int oldslash = -1, slash=0; slash != -1; oldslash = slash) {
            slash = dirName.indexOf(QDir::separator(), oldslash+1);
            if (slash == -1) {
                if (oldslash == dirName.length())
                    break;
                slash = dirName.length();
            }
            if (slash) {
                QByteArray chunk = QFile::encodeName(dirName.left(slash));
                QT_STATBUF st;
                if (QT_STAT(chunk, &st) != -1) {
                    if ((st.st_mode & S_IFMT) != S_IFDIR)
                        return false;
                } else if (QT_MKDIR(chunk, 0777) != 0) {
                    return false;
                }
            }
        }
        return true;
    }
#if defined(Q_OS_DARWIN)  // Mac X doesn't support trailing /'s
    if (dirName.endsWith(QLatin1Char('/')))
        dirName.chop(1);
#endif
    return (QT_MKDIR(QFile::encodeName(dirName), 0777) == 0);
}

/*!
    \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;
}

//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
bool QFileSystemEngine::removeFile(const QFileSystemEntry &entry, QSystemError &error)
{
    if (unlink(entry.nativeFilePath().constData()) == 0)
        return true;
    error = QSystemError(errno, QSystemError::StandardLibraryError);
    return false;

}

static bool isPackage(const QFileSystemMetaData &data, const QFileSystemEntry &entry)
{
    if (!data.isDirectory())
        return false;

    QFileInfo info(entry.filePath());
    QString suffix = info.suffix();

    if (suffix.length() > 0) {
        // First step: is the extension known ?
        QCFType<CFStringRef> extensionRef = QCFString::toCFStringRef(suffix);
        QCFType<CFStringRef> uniformTypeIdentifier = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, extensionRef, NULL);
        if (UTTypeConformsTo(uniformTypeIdentifier, kUTTypeBundle))
            return true;

        // Second step: check if an application knows the package type
        QCFType<CFStringRef> path = QCFString::toCFStringRef(entry.filePath());
        QCFType<CFURLRef> url = CFURLCreateWithFileSystemPath(0, path, kCFURLPOSIXPathStyle, true);

        UInt32 type, creator;
        // Well created packages have the PkgInfo file
        if (CFBundleGetPackageInfoInDirectory(url, &type, &creator))
            return true;

#ifdef Q_OS_OSX
        // Find if an application other than Finder claims to know how to handle the package
        QCFType<CFURLRef> application;
        LSGetApplicationForURL(url,
                               kLSRolesEditor|kLSRolesViewer|kLSRolesViewer,
                               NULL,
                               &application);

        if (application) {
            QCFType<CFBundleRef> bundle = CFBundleCreate(kCFAllocatorDefault, application);
            CFStringRef identifier = CFBundleGetIdentifier(bundle);
            QString applicationId = QCFString::toQString(identifier);
            if (applicationId != QLatin1String("com.apple.finder"))
                return true;
        }
#endif
    }

    // Third step: check if the directory has the package bit set
    return hasResourcePropertyFlag(data, entry, kCFURLIsPackageKey);
}