Method extractSubDir

launcher/MMCZip.cpp:276–345

ours

// ours
std::optional<QStringList> MMCZip::extractSubDir(QuaZip *zip, const QString & subdir, const QString &target)
{
    QDir directory(target);
    QStringList extracted;

    qDebug() << "Extracting subdir" << subdir << "from" << zip->getZipName() << "to" << target;
    auto numEntries = zip->getEntriesCount();
    if(numEntries < 0) {
        qWarning() << "Failed to enumerate files in archive";
        return std::nullopt;
    }
    else if(numEntries == 0) {
        qDebug() << "Extracting empty archives seems odd...";
        return extracted;
    }
    else if (!zip->goToFirstFile())
    {
        qWarning() << "Failed to seek to first file in zip";
        return std::nullopt;
    }

    do
    {
        QString name = zip->getCurrentFileName();
        if(!QDir::cleanPath(name).startsWith(subdir))
        {
            continue;
        }
        if (QDir::isAbsolutePath(name) || QDir::cleanPath(name).startsWith(".."))
        {
            qDebug() << "extractSubDir: Skipping file that tries to place itself in an absolute location or in a parent directory.";
            continue;
        }

        name.remove(0, subdir.size());
        auto original_name = name;

        // Fix weird "folders with a single file get squashed" thing
        QString path;
        if(name.contains('/') && !name.endsWith('/')){
            path = name.section('/', 0, -2) + "/";
            FS::ensureFolderPathExists(FS::PathCombine(target, path));

            name = name.split('/').last();
        }

        QString absFilePath;
        if(name.isEmpty())
        {
            absFilePath = directory.absoluteFilePath(name) + "/";
        }
        else
        {
            absFilePath = directory.absoluteFilePath(path + name);
        }

        if (!JlCompress::extractFile(zip, "", absFilePath))
        {