    bool isTiffType(BasicIo& iIo, bool advance)
    {
        const int32_t len = 8;
        byte buf[len];
        iIo.read(buf, len);
        if (iIo.error() || iIo.eof()) {
            return false;
        }
        TiffHeader tiffHeader;
        bool rc = tiffHeader.read(buf, len);
        if (!advance || !rc) {
            iIo.seek(-len, BasicIo::cur);
        }
        return rc;
    }
Unknown