PHPOffice / PhpSpreadsheet

        $v_binary_data = fread($this->zip_fd, 26);

        // ----- Look for invalid block size

        if (strlen($v_binary_data) != 26) {

            $p_header['filename'] = '';

            $p_header['status'] = 'invalid_header';

            // ----- Error log

            self::privErrorLog(PCLZIP_ERR_BAD_FORMAT, 'Invalid block size : ' . strlen($v_binary_data));

            // ----- Return

            return self::errorCode();

        }

        // ----- Extract the values

        $v_data = unpack('vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $v_binary_data);

        $v_binary_data = fread($this->zip_fd, 42);

        // ----- Look for invalid block size

        if (strlen($v_binary_data) != 42) {

            $p_header['filename'] = '';

            $p_header['status'] = 'invalid_header';

            // ----- Error log

            self::privErrorLog(PCLZIP_ERR_BAD_FORMAT, 'Invalid block size : ' . strlen($v_binary_data));

            // ----- Return

            return self::errorCode();

        }

        // ----- Extract the values

        $p_header = unpack('vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $v_binary_data);