Libarchive creates empty file called T while archiveing

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Bharathi Nandhan

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May 20, 2019, 6:53:14 AM5/20/19
to libarchive-discuss
Am using Qt for my development. Below is the code which i used for creating tar.gz files. 

Few times while creating tar.gz it creates an empty file T with 0 bytes of memory usage. What am i doing wrong here


    /**
     * @brief Create a tar bundle
     * @param QMap<SaveFileName, SaveFilePath> m_SaveFile - url of file
     * @param QMap<FileName , FilePath> m_FilesToTar - Files to be tar bundled
     * @return 0 on failure 1 on success
     */
bool SSL_ED::CreateTarBundle(QMap<QString, QString> m_SaveFile, QMap<QString, QString> m_FilesToTar, unsigned int i_FileType)
{
    if( m_SaveFile.size() != 1 ) {
        qDebug() << "Invalid tar bundle save location or filename";
        return false;
    }
    if ( !QDir::setCurrent(m_SaveFile.value(m_SaveFile.firstKey())) ) {
        qDebug() << "Bundle creation: Unable to change dir";
        return false;
    }


    struct archive *a;
    struct archive_entry *entry;
    struct stat st;

    a = archive_write_new();
    archive_write_add_filter_gzip(a);
    archive_write_set_format_pax_restricted(a);
    archive_write_open_filename(a, m_SaveFile.firstKey().toUtf8().constData());

    QMapIterator<QString, QString> mItr(m_FilesToTar);
    while(mItr.hasNext())
    {
        mItr.next();
        if( !QDir::setCurrent(mItr.value()) ) {
            qDebug() << "Bundle creation: Unable to change dir to read file";
            return false;
        }
        const char *filename = mItr.key().toUtf8().constData();
        stat(filename, &st);
        entry = archive_entry_new();
        archive_entry_set_pathname(entry, filename);
        archive_entry_set_size(entry, st.st_size);
        archive_entry_set_filetype(entry, AE_IFREG);
        archive_entry_set_perm(entry, 0644);
        archive_write_header(a, entry);

        QFile file(mItr.value()+mItr.key());
        qDebug() << "FileName:"<<mItr.value()+mItr.key();
        if (!file.open(QIODevice::ReadOnly))
        {
            qDebug() << "Unable to read file for creating tar:"<<file.fileName();
            return false;
        }

        char c_ReadData[512000];
        qint64 i_ReadData = file.read(c_ReadData,512000);
        while( i_ReadData > 0 )
        {
            int i = archive_write_data(a, c_ReadData, static_cast<size_t>(i_ReadData));
            if ( i == ARCHIVE_RETRY || i == ARCHIVE_WARN ||
                 i == ARCHIVE_FAILED || i == ARCHIVE_FATAL )
            {
                qDebug() <<"Fatal error while creating tar file: "<<i;
                return false;
            }
            i_ReadData = file.read(c_ReadData,512000);
        }
        file.close();
        file.flush();
        archive_entry_free(entry);
    }
    if ( ARCHIVE_OK != archive_write_close(a) ){
        return false;
    }
    if ( ARCHIVE_OK != archive_write_free(a) ){
        return false;
    }
    return true;
}
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