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     * Mime-type in order to use zlib, bzip2 or no compression.

     * In case ext-fileinfo is not present only the relevant types

     * 'application/x-gzip' and 'application/x-bzip2' are assigned

     * to this class property.

     *

        if ($this->fileType === 'application/x-gzip' || $this->fileType === 'application/gzip') {

        if (class_exists('\\finfo')) {

            $fileInfo = new \finfo();

            return $fileInfo->file($this->fileName, FILEINFO_MIME_TYPE);

        }

        return $this->determineFileTypeByHeader();

    }

    /**

     * In case ext-fileinfo is not present only the relevant types

     * 'application/x-gzip' and 'application/x-bzip2' are resolved.

     *

     * @return string

     */

    private function determineFileTypeByHeader()

    {

        $resource = fopen($this->fileName, 'r');

        if (!is_resource($resource)) {

            throw new ReaderException(

                sprintf('Resource %s could not be opened', $this->fileName),

                1557753055

            );

        }

        $header = fgets($resource, 4);

        fclose($resource);

        $mimeType = '';

        if (strpos($header, "\x42\x5a\x68") === 0) {

            $mimeType = 'application/x-bzip2';

        } elseif (strpos($header, "\x1f\x8b") === 0) {

            $mimeType = 'application/x-gzip';

        }

        return $mimeType;