    byte PgfImage::readPgfMagicNumber(BasicIo& iIo)
    {
        byte b = iIo.getb();
        if (iIo.error()) throw Error(kerFailedToReadImageData);

        if (b < 0x36)   // 0x36 = '6'.
        {
            // Not right Magick version.
#ifdef DEBUG
            std::cout << "Exiv2::PgfImage::readMetadata: wrong Magick number\n";
#endif
        }

        return b;
    } // PgfImage::readPgfMagicNumber
Unknown