PhpOffice\PhpSpreadsheet\Writer\Xls\Workbook

Complexity

Total Complexity

103

Size/Duplication

Total Lines	1390
Duplicated Lines	6.69 %

Coupling/Cohesion

Components	1
Dependencies	15

Test Coverage

Coverage

58.35%

Importance

Changes

0

35 Methods

Rating	Name	Duplication	Size	Complexity
B	__construct()	0	37	3
B	addXfWriter()	0	44	3
A	addFont()	0	18	3
B	addColor()	0	25	3
A	setPaletteXl97()	0	61	1
A	writeWorkbook()	0	48	3
A	calcSheetOffsets()	0	20	3
A	writeAllFonts()	0	6	2
A	writeAllNumberFormats()	0	6	2
A	writeAllXfs()	0	6	2
A	writeAllStyles()	0	4	1
A	writeExternals()	0	11	2
C	writeNames()	16	88	10
D	writeAllDefinedNamesBiff8()	22	145	23
B	writeDefinedNameBiff8()	0	25	2
B	writeShortNameBiff8()	0	29	2
A	writeCodepage()	0	11	1
B	writeWindow1()	0	25	1
B	writeBoundSheet()	0	33	4
A	writeSupbookInternal()	9	10	1
A	writeExternalsheetBiff8()	0	15	2
A	writeStyle()	0	13	1
A	writeNumberFormat()	11	11	1
A	writeDateMode()	0	13	2
A	writeExternalCount()	0	9	1
A	writeExternalSheet()	12	12	1
A	writeNameShort()	0	50	1
A	writeNameLong()	0	69	1
A	writeCountry()	11	11	1
A	writeRecalcId()	12	12	1
A	writePalette()	0	19	3
C	writeSharedStringsTable()	0	110	12
A	writeMsoDrawingGroup()	0	16	2
A	getEscher()	0	4	1
A	setEscher()	0	4	1

<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Xls;

use PhpOffice\PhpSpreadsheet\Cell;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
use PhpOffice\PhpSpreadsheet\Shared\Date;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
use PhpOffice\PhpSpreadsheet\Spreadsheet;

/**
 * Copyright (c) 2006 - 2015 PhpSpreadsheet.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category   PhpSpreadsheet
 *
 * @copyright  Copyright (c) 2006 - 2015 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 */

// Original file header of PEAR::Spreadsheet_Excel_Writer_Workbook (used as the base for this class):
// -----------------------------------------------------------------------------------------
// /*
// *  Module written/ported by Xavier Noguer <xnoguer@rezebra.com>
// *
// *  The majority of this is _NOT_ my code.  I simply ported it from the
// *  PERL Spreadsheet::WriteExcel module.
// *
// *  The author of the Spreadsheet::WriteExcel module is John McNamara
// *  <jmcnamara@cpan.org>
// *
// *  I _DO_ maintain this code, and John McNamara has nothing to do with the
// *  porting of this code to PHP.  Any questions directly related to this
// *  class library should be directed to me.
// *
// *  License Information:
// *
// *    Spreadsheet_Excel_Writer:  A library for generating Excel Spreadsheets
// *    Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com
// *
// *    This library is free software; you can redistribute it and/or
// *    modify it under the terms of the GNU Lesser General Public
// *    License as published by the Free Software Foundation; either
// *    version 2.1 of the License, or (at your option) any later version.
// *
// *    This library is distributed in the hope that it will be useful,
// *    but WITHOUT ANY WARRANTY; without even the implied warranty of
// *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// *    Lesser General Public License for more details.
// *
// *    You should have received a copy of the GNU Lesser General Public
// *    License along with this library; if not, write to the Free Software
// *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// */
class Workbook extends BIFFwriter
{
    /**
     * Formula parser.
     *
     * @var \PhpOffice\PhpSpreadsheet\Writer\Xls\Parser
     */
    private $parser;

    /**
     * The BIFF file size for the workbook.
     *
     * @var int
     *
     * @see calcSheetOffsets()
     */
    private $biffSize;

    /**
     * XF Writers.
     *
     * @var \PhpOffice\PhpSpreadsheet\Writer\Xls\Xf[]
     */
    private $xfWriters = [];

    /**
     * Array containing the colour palette.
     *
     * @var array
     */
    private $palette;

    /**
     * The codepage indicates the text encoding used for strings.
     *
     * @var int
     */
    private $codepage;

    /**
     * The country code used for localization.
     *
     * @var int
     */
    private $countryCode;

    /**
     * Workbook.
     *
     * @var Spreadsheet
     */
    private $spreadsheet;

    /**
     * Fonts writers.
     *
     * @var Font[]
     */
    private $fontWriters = [];

    /**
     * Added fonts. Maps from font's hash => index in workbook.
     *
     * @var array
     */
    private $addedFonts = [];

    /**
     * Shared number formats.
     *
     * @var array
     */
    private $numberFormats = [];

    /**
     * Added number formats. Maps from numberFormat's hash => index in workbook.
     *
     * @var array
     */
    private $addedNumberFormats = [];

    /**
     * Sizes of the binary worksheet streams.
     *
     * @var array
     */
    private $worksheetSizes = [];

    /**
     * Offsets of the binary worksheet streams relative to the start of the global workbook stream.
     *
     * @var array
     */
    private $worksheetOffsets = [];

    /**
     * Total number of shared strings in workbook.
     *
     * @var int
     */
    private $stringTotal;

    /**
     * Number of unique shared strings in workbook.
     *
     * @var int
     */
    private $stringUnique;

    /**
     * Array of unique shared strings in workbook.
     *
     * @var array
     */
    private $stringTable;

    /**
     * Color cache.
     */
    private $colors;

    /**
     * Escher object corresponding to MSODRAWINGGROUP.
     *
     * @var \PhpOffice\PhpSpreadsheet\Shared\Escher
     */
    private $escher;

    /**
     * Class constructor.
     *
     * @param Spreadsheet $spreadsheet The Workbook
     * @param int $str_total Total number of strings
     * @param int $str_unique Total number of unique strings
     * @param array $str_table String Table
     * @param array $colors Colour Table
     * @param Parser $parser The formula parser created for the Workbook
     */
    public function __construct(Spreadsheet $spreadsheet, &$str_total, &$str_unique, &$str_table, &$colors, Parser $parser)
    {
        // It needs to call its parent's constructor explicitly
        parent::__construct();

        $this->parser = $parser;
        $this->biffSize = 0;
        $this->palette = [];
        $this->countryCode = -1;

        $this->stringTotal = &$str_total;
        $this->stringUnique = &$str_unique;
        $this->stringTable = &$str_table;
        $this->colors = &$colors;
        $this->setPaletteXl97();

        $this->spreadsheet = $spreadsheet;

        $this->codepage = 0x04B0;

        // Add empty sheets and Build color cache
        $countSheets = $spreadsheet->getSheetCount();
        for ($i = 0; $i < $countSheets; ++$i) {
            $phpSheet = $spreadsheet->getSheet($i);

            $this->parser->setExtSheet($phpSheet->getTitle(), $i); // Register worksheet name with parser

            $supbook_index = 0x00;
            $ref = pack('vvv', $supbook_index, $i, $i);
            $this->parser->references[] = $ref; // Register reference with parser

            // Sheet tab colors?
            if ($phpSheet->isTabColorSet()) {
                $this->addColor($phpSheet->getTabColor()->getRGB());
            }
        }
    }

    /**
     * Add a new XF writer.
     *
     * @param \PhpOffice\PhpSpreadsheet\Style
     * @param bool Is it a style XF?
     * @param mixed $style
     * @param mixed $isStyleXf
     *
     * @return int Index to XF record
     */
    public function addXfWriter($style, $isStyleXf = false)
    {
        $xfWriter = new Xf($style);
        $xfWriter->setIsStyleXf($isStyleXf);

        // Add the font if not already added
        $fontIndex = $this->addFont($style->getFont());

        // Assign the font index to the xf record
        $xfWriter->setFontIndex($fontIndex);

        // Background colors, best to treat these after the font so black will come after white in custom palette
        $xfWriter->setFgColor($this->addColor($style->getFill()->getStartColor()->getRGB()));
        $xfWriter->setBgColor($this->addColor($style->getFill()->getEndColor()->getRGB()));
        $xfWriter->setBottomColor($this->addColor($style->getBorders()->getBottom()->getColor()->getRGB()));
        $xfWriter->setTopColor($this->addColor($style->getBorders()->getTop()->getColor()->getRGB()));
        $xfWriter->setRightColor($this->addColor($style->getBorders()->getRight()->getColor()->getRGB()));
        $xfWriter->setLeftColor($this->addColor($style->getBorders()->getLeft()->getColor()->getRGB()));
        $xfWriter->setDiagColor($this->addColor($style->getBorders()->getDiagonal()->getColor()->getRGB()));

        // Add the number format if it is not a built-in one and not already added
        if ($style->getNumberFormat()->getBuiltInFormatCode() === false) {
            $numberFormatHashCode = $style->getNumberFormat()->getHashCode();

            if (isset($this->addedNumberFormats[$numberFormatHashCode])) {
                $numberFormatIndex = $this->addedNumberFormats[$numberFormatHashCode];
            } else {
                $numberFormatIndex = 164 + count($this->numberFormats);
                $this->numberFormats[$numberFormatIndex] = $style->getNumberFormat();
                $this->addedNumberFormats[$numberFormatHashCode] = $numberFormatIndex;
            }
        } else {
            $numberFormatIndex = (int) $style->getNumberFormat()->getBuiltInFormatCode();
        }

        // Assign the number format index to xf record
        $xfWriter->setNumberFormatIndex($numberFormatIndex);

        $this->xfWriters[] = $xfWriter;

        $xfIndex = count($this->xfWriters) - 1;

        return $xfIndex;
    }

    /**
     * Add a font to added fonts.
     *
     * @param \PhpOffice\PhpSpreadsheet\Style\Font $font
     *
     * @return int Index to FONT record
     */
    public function addFont(\PhpOffice\PhpSpreadsheet\Style\Font $font)
    {
        $fontHashCode = $font->getHashCode();
        if (isset($this->addedFonts[$fontHashCode])) {
            $fontIndex = $this->addedFonts[$fontHashCode];
        } else {
            $countFonts = count($this->fontWriters);
            $fontIndex = ($countFonts < 4) ? $countFonts : $countFonts + 1;

            $fontWriter = new Font($font);
            $fontWriter->setColorIndex($this->addColor($font->getColor()->getRGB()));
            $this->fontWriters[] = $fontWriter;

            $this->addedFonts[$fontHashCode] = $fontIndex;
        }

        return $fontIndex;
    }

    /**
     * Alter color palette adding a custom color.
     *
     * @param string $rgb E.g. 'FF00AA'
     *
     * @return int Color index
     */
    private function addColor($rgb)
    {
        if (!isset($this->colors[$rgb])) {
            if (count($this->colors) < 57) {
                // then we add a custom color altering the palette
                $colorIndex = 8 + count($this->colors);
                $this->palette[$colorIndex] =
                    [
                        hexdec(substr($rgb, 0, 2)),
                        hexdec(substr($rgb, 2, 2)),
                        hexdec(substr($rgb, 4)),
                        0,
                    ];
                $this->colors[$rgb] = $colorIndex;
            } else {
                // no room for more custom colors, just map to black
                $colorIndex = 0;
            }
        } else {
            // fetch already added custom color
            $colorIndex = $this->colors[$rgb];
        }

        return $colorIndex;
    }

    /**
     * Sets the colour palette to the Excel 97+ default.
     */
    private function setPaletteXl97()
    {
        $this->palette = [
            0x08 => [0x00, 0x00, 0x00, 0x00],
            0x09 => [0xff, 0xff, 0xff, 0x00],
            0x0A => [0xff, 0x00, 0x00, 0x00],
            0x0B => [0x00, 0xff, 0x00, 0x00],
            0x0C => [0x00, 0x00, 0xff, 0x00],
            0x0D => [0xff, 0xff, 0x00, 0x00],
            0x0E => [0xff, 0x00, 0xff, 0x00],
            0x0F => [0x00, 0xff, 0xff, 0x00],
            0x10 => [0x80, 0x00, 0x00, 0x00],
            0x11 => [0x00, 0x80, 0x00, 0x00],
            0x12 => [0x00, 0x00, 0x80, 0x00],
            0x13 => [0x80, 0x80, 0x00, 0x00],
            0x14 => [0x80, 0x00, 0x80, 0x00],
            0x15 => [0x00, 0x80, 0x80, 0x00],
            0x16 => [0xc0, 0xc0, 0xc0, 0x00],
            0x17 => [0x80, 0x80, 0x80, 0x00],
            0x18 => [0x99, 0x99, 0xff, 0x00],
            0x19 => [0x99, 0x33, 0x66, 0x00],
            0x1A => [0xff, 0xff, 0xcc, 0x00],
            0x1B => [0xcc, 0xff, 0xff, 0x00],
            0x1C => [0x66, 0x00, 0x66, 0x00],
            0x1D => [0xff, 0x80, 0x80, 0x00],
            0x1E => [0x00, 0x66, 0xcc, 0x00],
            0x1F => [0xcc, 0xcc, 0xff, 0x00],
            0x20 => [0x00, 0x00, 0x80, 0x00],
            0x21 => [0xff, 0x00, 0xff, 0x00],
            0x22 => [0xff, 0xff, 0x00, 0x00],
            0x23 => [0x00, 0xff, 0xff, 0x00],
            0x24 => [0x80, 0x00, 0x80, 0x00],
            0x25 => [0x80, 0x00, 0x00, 0x00],
            0x26 => [0x00, 0x80, 0x80, 0x00],
            0x27 => [0x00, 0x00, 0xff, 0x00],
            0x28 => [0x00, 0xcc, 0xff, 0x00],
            0x29 => [0xcc, 0xff, 0xff, 0x00],
            0x2A => [0xcc, 0xff, 0xcc, 0x00],
            0x2B => [0xff, 0xff, 0x99, 0x00],
            0x2C => [0x99, 0xcc, 0xff, 0x00],
            0x2D => [0xff, 0x99, 0xcc, 0x00],
            0x2E => [0xcc, 0x99, 0xff, 0x00],
            0x2F => [0xff, 0xcc, 0x99, 0x00],
            0x30 => [0x33, 0x66, 0xff, 0x00],
            0x31 => [0x33, 0xcc, 0xcc, 0x00],
            0x32 => [0x99, 0xcc, 0x00, 0x00],
            0x33 => [0xff, 0xcc, 0x00, 0x00],
            0x34 => [0xff, 0x99, 0x00, 0x00],
            0x35 => [0xff, 0x66, 0x00, 0x00],
            0x36 => [0x66, 0x66, 0x99, 0x00],
            0x37 => [0x96, 0x96, 0x96, 0x00],
            0x38 => [0x00, 0x33, 0x66, 0x00],
            0x39 => [0x33, 0x99, 0x66, 0x00],
            0x3A => [0x00, 0x33, 0x00, 0x00],
            0x3B => [0x33, 0x33, 0x00, 0x00],
            0x3C => [0x99, 0x33, 0x00, 0x00],
            0x3D => [0x99, 0x33, 0x66, 0x00],
            0x3E => [0x33, 0x33, 0x99, 0x00],
            0x3F => [0x33, 0x33, 0x33, 0x00],
        ];
    }

    /**
     * Assemble worksheets into a workbook and send the BIFF data to an OLE
     * storage.
     *
     * @param array $pWorksheetSizes The sizes in bytes of the binary worksheet streams
     *
     * @return string Binary data for workbook stream
     */
    public function writeWorkbook(array $pWorksheetSizes)
    {
        $this->worksheetSizes = $pWorksheetSizes;

        // Calculate the number of selected worksheet tabs and call the finalization
        // methods for each worksheet
        $total_worksheets = $this->spreadsheet->getSheetCount();

        // Add part 1 of the Workbook globals, what goes before the SHEET records
        $this->storeBof(0x0005);
        $this->writeCodepage();
        $this->writeWindow1();

        $this->writeDateMode();
        $this->writeAllFonts();
        $this->writeAllNumberFormats();
        $this->writeAllXfs();
        $this->writeAllStyles();
        $this->writePalette();

        // Prepare part 3 of the workbook global stream, what goes after the SHEET records
        $part3 = '';
        if ($this->countryCode != -1) {
            $part3 .= $this->writeCountry();
        }
        $part3 .= $this->writeRecalcId();

        $part3 .= $this->writeSupbookInternal();
        /* TODO: store external SUPBOOK records and XCT and CRN records
        in case of external references for BIFF8 */
        $part3 .= $this->writeExternalsheetBiff8();
        $part3 .= $this->writeAllDefinedNamesBiff8();
        $part3 .= $this->writeMsoDrawingGroup();
        $part3 .= $this->writeSharedStringsTable();

        $part3 .= $this->writeEof();

        // Add part 2 of the Workbook globals, the SHEET records
        $this->calcSheetOffsets();
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $this->writeBoundSheet($this->spreadsheet->getSheet($i), $this->worksheetOffsets[$i]);
        }

        // Add part 3 of the Workbook globals
        $this->_data .= $part3;

        return $this->_data;
    }

    /**
     * Calculate offsets for Worksheet BOF records.
     */
    private function calcSheetOffsets()
    {
        $boundsheet_length = 10; // fixed length for a BOUNDSHEET record

        // size of Workbook globals part 1 + 3
        $offset = $this->_datasize;

        // add size of Workbook globals part 2, the length of the SHEET records
        $total_worksheets = count($this->spreadsheet->getAllSheets());
        foreach ($this->spreadsheet->getWorksheetIterator() as $sheet) {
            $offset += $boundsheet_length + strlen(StringHelper::UTF8toBIFF8UnicodeShort($sheet->getTitle()));
        }

        // add the sizes of each of the Sheet substreams, respectively
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $this->worksheetOffsets[$i] = $offset;
            $offset += $this->worksheetSizes[$i];
        }
        $this->biffSize = $offset;
    }

    /**
     * Store the Excel FONT records.
     */
    private function writeAllFonts()
    {
        foreach ($this->fontWriters as $fontWriter) {
            $this->append($fontWriter->writeFont());
        }
    }

    /**
     * Store user defined numerical formats i.e. FORMAT records.
     */
    private function writeAllNumberFormats()
    {
        foreach ($this->numberFormats as $numberFormatIndex => $numberFormat) {
            $this->writeNumberFormat($numberFormat->getFormatCode(), $numberFormatIndex);
        }
    }

    /**
     * Write all XF records.
     */
    private function writeAllXfs()
    {
        foreach ($this->xfWriters as $xfWriter) {
            $this->append($xfWriter->writeXf());
        }
    }

    /**
     * Write all STYLE records.
     */
    private function writeAllStyles()
    {
        $this->writeStyle();
    }

    /**
     * Write the EXTERNCOUNT and EXTERNSHEET records. These are used as indexes for
     * the NAME records.
     */
    private function writeExternals()

This method is not used, and could be removed.

    {
        $countSheets = $this->spreadsheet->getSheetCount();
        // Create EXTERNCOUNT with number of worksheets
        $this->writeExternalCount($countSheets);

        // Create EXTERNSHEET for each worksheet
        for ($i = 0; $i < $countSheets; ++$i) {
            $this->writeExternalSheet($this->spreadsheet->getSheet($i)->getTitle());
        }
    }

    /**
     * Write the NAME record to define the print area and the repeat rows and cols.
     */
    private function writeNames()

This method is not used, and could be removed.

    {
        // total number of sheets
        $total_worksheets = $this->spreadsheet->getSheetCount();

        // Create the print area NAME records
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $sheetSetup = $this->spreadsheet->getSheet($i)->getPageSetup();
            // Write a Name record if the print area has been defined
            if ($sheetSetup->isPrintAreaSet()) {
                // Print area
                $printArea = Cell::splitRange($sheetSetup->getPrintArea());
                $printArea = $printArea[0];
                $printArea[0] = Cell::coordinateFromString($printArea[0]);
                $printArea[1] = Cell::coordinateFromString($printArea[1]);

                $print_rowmin = $printArea[0][1] - 1;
                $print_rowmax = $printArea[1][1] - 1;
                $print_colmin = Cell::columnIndexFromString($printArea[0][0]) - 1;
                $print_colmax = Cell::columnIndexFromString($printArea[1][0]) - 1;

                $this->writeNameShort(
                    $i, // sheet index
                    0x06, // NAME type
                    $print_rowmin,
                    $print_rowmax,
                    $print_colmin,
                    $print_colmax
                );
            }
        }

        // Create the print title NAME records
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $sheetSetup = $this->spreadsheet->getSheet($i)->getPageSetup();

            // simultaneous repeatColumns repeatRows
            if ($sheetSetup->isColumnsToRepeatAtLeftSet() && $sheetSetup->isRowsToRepeatAtTopSet()) {
                $repeat = $sheetSetup->getColumnsToRepeatAtLeft();
                $colmin = Cell::columnIndexFromString($repeat[0]) - 1;
                $colmax = Cell::columnIndexFromString($repeat[1]) - 1;

                $repeat = $sheetSetup->getRowsToRepeatAtTop();
                $rowmin = $repeat[0] - 1;
                $rowmax = $repeat[1] - 1;

                $this->writeNameLong(
                    $i, // sheet index
                    0x07, // NAME type
                    $rowmin,
                    $rowmax,
                    $colmin,
                    $colmax
                );

            // (exclusive) either repeatColumns or repeatRows
            } elseif ($sheetSetup->isColumnsToRepeatAtLeftSet() || $sheetSetup->isRowsToRepeatAtTopSet()) {
                // Columns to repeat
                if ($sheetSetup->isColumnsToRepeatAtLeftSet()) {

This code seems to be duplicated across your project.

                    $repeat = $sheetSetup->getColumnsToRepeatAtLeft();
                    $colmin = Cell::columnIndexFromString($repeat[0]) - 1;
                    $colmax = Cell::columnIndexFromString($repeat[1]) - 1;
                } else {
                    $colmin = 0;
                    $colmax = 255;
                }

                // Rows to repeat
                if ($sheetSetup->isRowsToRepeatAtTopSet()) {

This code seems to be duplicated across your project.

                    $repeat = $sheetSetup->getRowsToRepeatAtTop();
                    $rowmin = $repeat[0] - 1;
                    $rowmax = $repeat[1] - 1;
                } else {
                    $rowmin = 0;
                    $rowmax = 65535;
                }

                $this->writeNameShort(
                    $i, // sheet index
                    0x07, // NAME type
                    $rowmin,
                    $rowmax,
                    $colmin,
                    $colmax
                );
            }
        }
    }

    /**
     * Writes all the DEFINEDNAME records (BIFF8).
     * So far this is only used for repeating rows/columns (print titles) and print areas.
     */
    private function writeAllDefinedNamesBiff8()
    {
        $chunk = '';

        // Named ranges
        if (count($this->spreadsheet->getNamedRanges()) > 0) {
            // Loop named ranges
            $namedRanges = $this->spreadsheet->getNamedRanges();
            foreach ($namedRanges as $namedRange) {
                // Create absolute coordinate
                $range = Cell::splitRange($namedRange->getRange());
                for ($i = 0; $i < count($range); ++$i) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

This code seems to be duplicated across your project.

                    $range[$i][0] = '\'' . str_replace("'", "''", $namedRange->getWorksheet()->getTitle()) . '\'!' . Cell::absoluteCoordinate($range[$i][0]);
                    if (isset($range[$i][1])) {
                        $range[$i][1] = Cell::absoluteCoordinate($range[$i][1]);
                    }
                }
                $range = Cell::buildRange($range); // e.g. Sheet1!$A$1:$B$2

54% of this comment could be valid code. Did you maybe forget this after debugging?

                // parse formula
                try {
                    $error = $this->parser->parse($range);

$error is not used, you could remove the assignment.

                    $formulaData = $this->parser->toReversePolish();

                    // make sure tRef3d is of type tRef3dR (0x3A)
                    if (isset($formulaData[0]) and ($formulaData[0] == "\x7A" or $formulaData[0] == "\x5A")) {

Using logical operators such as and instead of && is generally not recommended.

Using logical operators such as or instead of || is generally not recommended.

                        $formulaData = "\x3A" . substr($formulaData, 1);
                    }

                    if ($namedRange->getLocalOnly()) {
                        // local scope
                        $scope = $this->spreadsheet->getIndex($namedRange->getScope()) + 1;

It seems like $namedRange->getScope() can be null; however, getIndex() does not accept null, maybe add an additional type check?

                    } else {
                        // global scope
                        $scope = 0;
                    }
                    $chunk .= $this->writeData($this->writeDefinedNameBiff8($namedRange->getName(), $formulaData, $scope, false));
                } catch (PhpSpreadsheetException $e) {
                    // do nothing
                }
            }
        }

        // total number of sheets
        $total_worksheets = $this->spreadsheet->getSheetCount();

        // write the print titles (repeating rows, columns), if any
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $sheetSetup = $this->spreadsheet->getSheet($i)->getPageSetup();
            // simultaneous repeatColumns repeatRows
            if ($sheetSetup->isColumnsToRepeatAtLeftSet() && $sheetSetup->isRowsToRepeatAtTopSet()) {
                $repeat = $sheetSetup->getColumnsToRepeatAtLeft();
                $colmin = Cell::columnIndexFromString($repeat[0]) - 1;
                $colmax = Cell::columnIndexFromString($repeat[1]) - 1;

                $repeat = $sheetSetup->getRowsToRepeatAtTop();
                $rowmin = $repeat[0] - 1;
                $rowmax = $repeat[1] - 1;

                // construct formula data manually
                $formulaData = pack('Cv', 0x29, 0x17); // tMemFunc
                $formulaData .= pack('Cvvvvv', 0x3B, $i, 0, 65535, $colmin, $colmax); // tArea3d
                $formulaData .= pack('Cvvvvv', 0x3B, $i, $rowmin, $rowmax, 0, 255); // tArea3d
                $formulaData .= pack('C', 0x10); // tList

                // store the DEFINEDNAME record
                $chunk .= $this->writeData($this->writeDefinedNameBiff8(pack('C', 0x07), $formulaData, $i + 1, true));

            // (exclusive) either repeatColumns or repeatRows
            } elseif ($sheetSetup->isColumnsToRepeatAtLeftSet() || $sheetSetup->isRowsToRepeatAtTopSet()) {
                // Columns to repeat
                if ($sheetSetup->isColumnsToRepeatAtLeftSet()) {

This code seems to be duplicated across your project.

                    $repeat = $sheetSetup->getColumnsToRepeatAtLeft();
                    $colmin = Cell::columnIndexFromString($repeat[0]) - 1;
                    $colmax = Cell::columnIndexFromString($repeat[1]) - 1;
                } else {
                    $colmin = 0;
                    $colmax = 255;
                }
                // Rows to repeat
                if ($sheetSetup->isRowsToRepeatAtTopSet()) {

This code seems to be duplicated across your project.

                    $repeat = $sheetSetup->getRowsToRepeatAtTop();
                    $rowmin = $repeat[0] - 1;
                    $rowmax = $repeat[1] - 1;
                } else {
                    $rowmin = 0;
                    $rowmax = 65535;
                }

                // construct formula data manually because parser does not recognize absolute 3d cell references
                $formulaData = pack('Cvvvvv', 0x3B, $i, $rowmin, $rowmax, $colmin, $colmax);

                // store the DEFINEDNAME record
                $chunk .= $this->writeData($this->writeDefinedNameBiff8(pack('C', 0x07), $formulaData, $i + 1, true));
            }
        }

        // write the print areas, if any
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $sheetSetup = $this->spreadsheet->getSheet($i)->getPageSetup();
            if ($sheetSetup->isPrintAreaSet()) {
                // Print area, e.g. A3:J6,H1:X20
                $printArea = Cell::splitRange($sheetSetup->getPrintArea());
                $countPrintArea = count($printArea);

                $formulaData = '';
                for ($j = 0; $j < $countPrintArea; ++$j) {
                    $printAreaRect = $printArea[$j]; // e.g. A3:J6
                    $printAreaRect[0] = Cell::coordinateFromString($printAreaRect[0]);
                    $printAreaRect[1] = Cell::coordinateFromString($printAreaRect[1]);

                    $print_rowmin = $printAreaRect[0][1] - 1;
                    $print_rowmax = $printAreaRect[1][1] - 1;
                    $print_colmin = Cell::columnIndexFromString($printAreaRect[0][0]) - 1;
                    $print_colmax = Cell::columnIndexFromString($printAreaRect[1][0]) - 1;

                    // construct formula data manually because parser does not recognize absolute 3d cell references
                    $formulaData .= pack('Cvvvvv', 0x3B, $i, $print_rowmin, $print_rowmax, $print_colmin, $print_colmax);

                    if ($j > 0) {
                        $formulaData .= pack('C', 0x10); // list operator token ','
                    }
                }

                // store the DEFINEDNAME record
                $chunk .= $this->writeData($this->writeDefinedNameBiff8(pack('C', 0x06), $formulaData, $i + 1, true));
            }
        }

        // write autofilters, if any
        for ($i = 0; $i < $total_worksheets; ++$i) {
            $sheetAutoFilter = $this->spreadsheet->getSheet($i)->getAutoFilter();
            $autoFilterRange = $sheetAutoFilter->getRange();
            if (!empty($autoFilterRange)) {
                $rangeBounds = Cell::rangeBoundaries($autoFilterRange);

                //Autofilter built in name
                $name = pack('C', 0x0D);

                $chunk .= $this->writeData($this->writeShortNameBiff8($name, $i + 1, $rangeBounds, true));
            }
        }

        return $chunk;
    }

    /**
     * Write a DEFINEDNAME record for BIFF8 using explicit binary formula data.
     *
     * @param string $name The name in UTF-8
     * @param string $formulaData The binary formula data
     * @param string $sheetIndex 1-based sheet index the defined name applies to. 0 = global
     * @param bool $isBuiltIn Built-in name?
     *
     * @return string Complete binary record data
     */
    private function writeDefinedNameBiff8($name, $formulaData, $sheetIndex = 0, $isBuiltIn = false)
    {
        $record = 0x0018;

        // option flags
        $options = $isBuiltIn ? 0x20 : 0x00;

        // length of the name, character count
        $nlen = StringHelper::countCharacters($name);

        // name with stripped length field
        $name = substr(StringHelper::UTF8toBIFF8UnicodeLong($name), 2);

        // size of the formula (in bytes)
        $sz = strlen($formulaData);

        // combine the parts
        $data = pack('vCCvvvCCCC', $options, 0, $nlen, $sz, 0, $sheetIndex, 0, 0, 0, 0)
            . $name . $formulaData;
        $length = strlen($data);

        $header = pack('vv', $record, $length);

        return $header . $data;
    }

    /**
     * Write a short NAME record.
     *
     * @param string $name
     * @param string $sheetIndex 1-based sheet index the defined name applies to. 0 = global
     * @param integer[][] $rangeBounds range boundaries
     * @param bool $isHidden
     *
     * @return string Complete binary record data
     * */
    private function writeShortNameBiff8($name, $sheetIndex, $rangeBounds, $isHidden = false)
    {
        $record = 0x0018;

        // option flags
        $options = ($isHidden ? 0x21 : 0x00);

        $extra = pack(
            'Cvvvvv',
            0x3B,
            $sheetIndex - 1,
            $rangeBounds[0][1] - 1,
            $rangeBounds[1][1] - 1,
            $rangeBounds[0][0] - 1,
            $rangeBounds[1][0] - 1
        );

        // size of the formula (in bytes)
        $sz = strlen($extra);

        // combine the parts
        $data = pack('vCCvvvCCCCC', $options, 0, 1, $sz, 0, $sheetIndex, 0, 0, 0, 0, 0)
            . $name . $extra;
        $length = strlen($data);

        $header = pack('vv', $record, $length);

        return $header . $data;
    }

    /**
     * Stores the CODEPAGE biff record.
     */
    private function writeCodepage()
    {
        $record = 0x0042; // Record identifier
        $length = 0x0002; // Number of bytes to follow
        $cv = $this->codepage; // The code page

        $header = pack('vv', $record, $length);
        $data = pack('v', $cv);

        $this->append($header . $data);
    }

    /**
     * Write Excel BIFF WINDOW1 record.
     */
    private function writeWindow1()
    {
        $record = 0x003D; // Record identifier
        $length = 0x0012; // Number of bytes to follow

        $xWn = 0x0000; // Horizontal position of window
        $yWn = 0x0000; // Vertical position of window
        $dxWn = 0x25BC; // Width of window
        $dyWn = 0x1572; // Height of window

        $grbit = 0x0038; // Option flags

        // not supported by PhpSpreadsheet, so there is only one selected sheet, the active
        $ctabsel = 1; // Number of workbook tabs selected

        $wTabRatio = 0x0258; // Tab to scrollbar ratio

        // not supported by PhpSpreadsheet, set to 0
        $itabFirst = 0; // 1st displayed worksheet
        $itabCur = $this->spreadsheet->getActiveSheetIndex(); // Active worksheet

        $header = pack('vv', $record, $length);
        $data = pack('vvvvvvvvv', $xWn, $yWn, $dxWn, $dyWn, $grbit, $itabCur, $itabFirst, $ctabsel, $wTabRatio);
        $this->append($header . $data);
    }

    /**
     * Writes Excel BIFF BOUNDSHEET record.
     *
     * @param \PhpOffice\PhpSpreadsheet\Worksheet $sheet Worksheet name
     * @param int $offset Location of worksheet BOF
     */
    private function writeBoundSheet($sheet, $offset)
    {
        $sheetname = $sheet->getTitle();
        $record = 0x0085; // Record identifier

        // sheet state
        switch ($sheet->getSheetState()) {
            case \PhpOffice\PhpSpreadsheet\Worksheet::SHEETSTATE_VISIBLE:
                $ss = 0x00;
                break;
            case \PhpOffice\PhpSpreadsheet\Worksheet::SHEETSTATE_HIDDEN:
                $ss = 0x01;
                break;
            case \PhpOffice\PhpSpreadsheet\Worksheet::SHEETSTATE_VERYHIDDEN:
                $ss = 0x02;
                break;
            default:
                $ss = 0x00;
                break;
        }

        // sheet type
        $st = 0x00;

        $grbit = 0x0000; // Visibility and sheet type

$grbit is not used, you could remove the assignment.

        $data = pack('VCC', $offset, $ss, $st);
        $data .= StringHelper::UTF8toBIFF8UnicodeShort($sheetname);

        $length = strlen($data);
        $header = pack('vv', $record, $length);
        $this->append($header . $data);
    }

    /**
     * Write Internal SUPBOOK record.
     */
    private function writeSupbookInternal()

This method seems to be duplicated in your project.

    {
        $record = 0x01AE; // Record identifier
        $length = 0x0004; // Bytes to follow

        $header = pack('vv', $record, $length);
        $data = pack('vv', $this->spreadsheet->getSheetCount(), 0x0401);

        return $this->writeData($header . $data);
    }

    /**
     * Writes the Excel BIFF EXTERNSHEET record. These references are used by
     * formulas.
     */
    private function writeExternalsheetBiff8()
    {
        $totalReferences = count($this->parser->references);
        $record = 0x0017; // Record identifier
        $length = 2 + 6 * $totalReferences; // Number of bytes to follow

        $supbook_index = 0; // FIXME: only using internal SUPBOOK record

$supbook_index is not used, you could remove the assignment.

        $header = pack('vv', $record, $length);
        $data = pack('v', $totalReferences);
        for ($i = 0; $i < $totalReferences; ++$i) {
            $data .= $this->parser->references[$i];
        }

        return $this->writeData($header . $data);
    }

    /**
     * Write Excel BIFF STYLE records.
     */
    private function writeStyle()
    {
        $record = 0x0293; // Record identifier
        $length = 0x0004; // Bytes to follow

        $ixfe = 0x8000; // Index to cell style XF
        $BuiltIn = 0x00; // Built-in style
        $iLevel = 0xff; // Outline style level

        $header = pack('vv', $record, $length);
        $data = pack('vCC', $ixfe, $BuiltIn, $iLevel);
        $this->append($header . $data);
    }

    /**
     * Writes Excel FORMAT record for non "built-in" numerical formats.
     *
     * @param string $format Custom format string
     * @param int $ifmt Format index code
     */
    private function writeNumberFormat($format, $ifmt)

This method seems to be duplicated in your project.

    {
        $record = 0x041E; // Record identifier

        $numberFormatString = StringHelper::UTF8toBIFF8UnicodeLong($format);
        $length = 2 + strlen($numberFormatString); // Number of bytes to follow

        $header = pack('vv', $record, $length);
        $data = pack('v', $ifmt) . $numberFormatString;
        $this->append($header . $data);
    }

    /**
     * Write DATEMODE record to indicate the date system in use (1904 or 1900).
     */
    private function writeDateMode()
    {
        $record = 0x0022; // Record identifier
        $length = 0x0002; // Bytes to follow

        $f1904 = (Date::getExcelCalendar() == Date::CALENDAR_MAC_1904)
            ? 1
            : 0; // Flag for 1904 date system

        $header = pack('vv', $record, $length);
        $data = pack('v', $f1904);
        $this->append($header . $data);
    }

    /**
     * Write BIFF record EXTERNCOUNT to indicate the number of external sheet
     * references in the workbook.
     *
     * Excel only stores references to external sheets that are used in NAME.
     * The workbook NAME record is required to define the print area and the repeat
     * rows and columns.
     *
     * A similar method is used in Worksheet.php for a slightly different purpose.
     *
     * @param int $cxals Number of external references
     */
    private function writeExternalCount($cxals)
    {
        $record = 0x0016; // Record identifier
        $length = 0x0002; // Number of bytes to follow

        $header = pack('vv', $record, $length);
        $data = pack('v', $cxals);
        $this->append($header . $data);
    }

    /**
     * Writes the Excel BIFF EXTERNSHEET record. These references are used by
     * formulas. NAME record is required to define the print area and the repeat
     * rows and columns.
     *
     * A similar method is used in Worksheet.php for a slightly different purpose.
     *
     * @param string $sheetname Worksheet name
     */
    private function writeExternalSheet($sheetname)

This method seems to be duplicated in your project.

    {
        $record = 0x0017; // Record identifier
        $length = 0x02 + strlen($sheetname); // Number of bytes to follow

        $cch = strlen($sheetname); // Length of sheet name
        $rgch = 0x03; // Filename encoding

        $header = pack('vv', $record, $length);
        $data = pack('CC', $cch, $rgch);
        $this->append($header . $data . $sheetname);
    }

    /**
     * Store the NAME record in the short format that is used for storing the print
     * area, repeat rows only and repeat columns only.
     *
     * @param int $index Sheet index
     * @param int $type Built-in name type
     * @param int $rowmin Start row
     * @param int $rowmax End row
     * @param int $colmin Start colum
     * @param int $colmax End column
     */
    private function writeNameShort($index, $type, $rowmin, $rowmax, $colmin, $colmax)
    {
        $record = 0x0018; // Record identifier
        $length = 0x0024; // Number of bytes to follow

        $grbit = 0x0020; // Option flags
        $chKey = 0x00; // Keyboard shortcut
        $cch = 0x01; // Length of text name
        $cce = 0x0015; // Length of text definition
        $ixals = $index + 1; // Sheet index
        $itab = $ixals; // Equal to ixals
        $cchCustMenu = 0x00; // Length of cust menu text
        $cchDescription = 0x00; // Length of description text
        $cchHelptopic = 0x00; // Length of help topic text
        $cchStatustext = 0x00; // Length of status bar text
        $rgch = $type; // Built-in name type

        $unknown03 = 0x3b;
        $unknown04 = 0xffff - $index;
        $unknown05 = 0x0000;
        $unknown06 = 0x0000;
        $unknown07 = 0x1087;
        $unknown08 = 0x8005;

        $header = pack('vv', $record, $length);
        $data = pack('v', $grbit);
        $data .= pack('C', $chKey);
        $data .= pack('C', $cch);
        $data .= pack('v', $cce);
        $data .= pack('v', $ixals);
        $data .= pack('v', $itab);
        $data .= pack('C', $cchCustMenu);
        $data .= pack('C', $cchDescription);
        $data .= pack('C', $cchHelptopic);
        $data .= pack('C', $cchStatustext);
        $data .= pack('C', $rgch);
        $data .= pack('C', $unknown03);
        $data .= pack('v', $unknown04);
        $data .= pack('v', $unknown05);
        $data .= pack('v', $unknown06);
        $data .= pack('v', $unknown07);
        $data .= pack('v', $unknown08);
        $data .= pack('v', $index);
        $data .= pack('v', $index);
        $data .= pack('v', $rowmin);
        $data .= pack('v', $rowmax);
        $data .= pack('C', $colmin);
        $data .= pack('C', $colmax);
        $this->append($header . $data);
    }

    /**
     * Store the NAME record in the long format that is used for storing the repeat
     * rows and columns when both are specified. This shares a lot of code with
     * writeNameShort() but we use a separate method to keep the code clean.
     * Code abstraction for reuse can be carried too far, and I should know. ;-).
     *
     * @param int $index Sheet index
     * @param int $type Built-in name type
     * @param int $rowmin Start row
     * @param int $rowmax End row
     * @param int $colmin Start colum
     * @param int $colmax End column
     */
    private function writeNameLong($index, $type, $rowmin, $rowmax, $colmin, $colmax)
    {
        $record = 0x0018; // Record identifier
        $length = 0x003d; // Number of bytes to follow
        $grbit = 0x0020; // Option flags
        $chKey = 0x00; // Keyboard shortcut
        $cch = 0x01; // Length of text name
        $cce = 0x002e; // Length of text definition
        $ixals = $index + 1; // Sheet index
        $itab = $ixals; // Equal to ixals
        $cchCustMenu = 0x00; // Length of cust menu text
        $cchDescription = 0x00; // Length of description text
        $cchHelptopic = 0x00; // Length of help topic text
        $cchStatustext = 0x00; // Length of status bar text
        $rgch = $type; // Built-in name type

        $unknown01 = 0x29;
        $unknown02 = 0x002b;
        $unknown03 = 0x3b;
        $unknown04 = 0xffff - $index;
        $unknown05 = 0x0000;
        $unknown06 = 0x0000;
        $unknown07 = 0x1087;
        $unknown08 = 0x8008;

        $header = pack('vv', $record, $length);
        $data = pack('v', $grbit);
        $data .= pack('C', $chKey);
        $data .= pack('C', $cch);
        $data .= pack('v', $cce);
        $data .= pack('v', $ixals);
        $data .= pack('v', $itab);
        $data .= pack('C', $cchCustMenu);
        $data .= pack('C', $cchDescription);
        $data .= pack('C', $cchHelptopic);
        $data .= pack('C', $cchStatustext);
        $data .= pack('C', $rgch);
        $data .= pack('C', $unknown01);
        $data .= pack('v', $unknown02);
        // Column definition
        $data .= pack('C', $unknown03);
        $data .= pack('v', $unknown04);
        $data .= pack('v', $unknown05);
        $data .= pack('v', $unknown06);
        $data .= pack('v', $unknown07);
        $data .= pack('v', $unknown08);
        $data .= pack('v', $index);
        $data .= pack('v', $index);
        $data .= pack('v', 0x0000);
        $data .= pack('v', 0x3fff);
        $data .= pack('C', $colmin);
        $data .= pack('C', $colmax);
        // Row definition
        $data .= pack('C', $unknown03);
        $data .= pack('v', $unknown04);
        $data .= pack('v', $unknown05);
        $data .= pack('v', $unknown06);
        $data .= pack('v', $unknown07);
        $data .= pack('v', $unknown08);
        $data .= pack('v', $index);
        $data .= pack('v', $index);
        $data .= pack('v', $rowmin);
        $data .= pack('v', $rowmax);
        $data .= pack('C', 0x00);
        $data .= pack('C', 0xff);
        // End of data
        $data .= pack('C', 0x10);
        $this->append($header . $data);
    }

    /**
     * Stores the COUNTRY record for localization.
     *
     * @return string
     */
    private function writeCountry()

This method seems to be duplicated in your project.

    {
        $record = 0x008C; // Record identifier
        $length = 4; // Number of bytes to follow

        $header = pack('vv', $record, $length);
        /* using the same country code always for simplicity */
        $data = pack('vv', $this->countryCode, $this->countryCode);

        return $this->writeData($header . $data);
    }

    /**
     * Write the RECALCID record.
     *
     * @return string
     */
    private function writeRecalcId()

This method seems to be duplicated in your project.

    {
        $record = 0x01C1; // Record identifier
        $length = 8; // Number of bytes to follow

        $header = pack('vv', $record, $length);

        // by inspection of real Excel files, MS Office Excel 2007 writes this
        $data = pack('VV', 0x000001C1, 0x00001E667);

        return $this->writeData($header . $data);
    }

    /**
     * Stores the PALETTE biff record.
     */
    private function writePalette()
    {
        $aref = $this->palette;

        $record = 0x0092; // Record identifier
        $length = 2 + 4 * count($aref); // Number of bytes to follow
        $ccv = count($aref); // Number of RGB values to follow
        $data = ''; // The RGB data

        // Pack the RGB data
        foreach ($aref as $color) {
            foreach ($color as $byte) {
                $data .= pack('C', $byte);
            }
        }

        $header = pack('vvv', $record, $length, $ccv);
        $this->append($header . $data);
    }

    /**
     * Handling of the SST continue blocks is complicated by the need to include an
     * additional continuation byte depending on whether the string is split between
     * blocks or whether it starts at the beginning of the block. (There are also
     * additional complications that will arise later when/if Rich Strings are
     * supported).
     *
     * The Excel documentation says that the SST record should be followed by an
     * EXTSST record. The EXTSST record is a hash table that is used to optimise
     * access to SST. However, despite the documentation it doesn't seem to be
     * required so we will ignore it.
     *
     * @return string Binary data
     */
    private function writeSharedStringsTable()
    {
        // maximum size of record data (excluding record header)
        $continue_limit = 8224;

        // initialize array of record data blocks
        $recordDatas = [];

        // start SST record data block with total number of strings, total number of unique strings
        $recordData = pack('VV', $this->stringTotal, $this->stringUnique);

        // loop through all (unique) strings in shared strings table
        foreach (array_keys($this->stringTable) as $string) {
            // here $string is a BIFF8 encoded string

            // length = character count
            $headerinfo = unpack('vlength/Cencoding', $string);

            // currently, this is always 1 = uncompressed
            $encoding = $headerinfo['encoding'];

            // initialize finished writing current $string
            $finished = false;

            while ($finished === false) {
                // normally, there will be only one cycle, but if string cannot immediately be written as is
                // there will be need for more than one cylcle, if string longer than one record data block, there
                // may be need for even more cycles

                if (strlen($recordData) + strlen($string) <= $continue_limit) {
                    // then we can write the string (or remainder of string) without any problems
                    $recordData .= $string;

                    if (strlen($recordData) + strlen($string) == $continue_limit) {
                        // we close the record data block, and initialize a new one
                        $recordDatas[] = $recordData;
                        $recordData = '';
                    }

                    // we are finished writing this string
                    $finished = true;
                } else {
                    // special treatment writing the string (or remainder of the string)
                    // If the string is very long it may need to be written in more than one CONTINUE record.

                    // check how many bytes more there is room for in the current record
                    $space_remaining = $continue_limit - strlen($recordData);

                    // minimum space needed
                    // uncompressed: 2 byte string length length field + 1 byte option flags + 2 byte character
                    // compressed:   2 byte string length length field + 1 byte option flags + 1 byte character
                    $min_space_needed = ($encoding == 1) ? 5 : 4;

                    // We have two cases
                    // 1. space remaining is less than minimum space needed
                    //        here we must waste the space remaining and move to next record data block
                    // 2. space remaining is greater than or equal to minimum space needed
                    //        here we write as much as we can in the current block, then move to next record data block

                    // 1. space remaining is less than minimum space needed
                    if ($space_remaining < $min_space_needed) {
                        // we close the block, store the block data
                        $recordDatas[] = $recordData;

                        // and start new record data block where we start writing the string
                        $recordData = '';

                    // 2. space remaining is greater than or equal to minimum space needed
                    } else {
                        // initialize effective remaining space, for Unicode strings this may need to be reduced by 1, see below
                        $effective_space_remaining = $space_remaining;

                        // for uncompressed strings, sometimes effective space remaining is reduced by 1
                        if ($encoding == 1 && (strlen($string) - $space_remaining) % 2 == 1) {
                            --$effective_space_remaining;
                        }

                        // one block fininshed, store the block data
                        $recordData .= substr($string, 0, $effective_space_remaining);

                        $string = substr($string, $effective_space_remaining); // for next cycle in while loop
                        $recordDatas[] = $recordData;

                        // start new record data block with the repeated option flags
                        $recordData = pack('C', $encoding);
                    }
                }
            }
        }

        // Store the last record data block unless it is empty
        // if there was no need for any continue records, this will be the for SST record data block itself
        if (strlen($recordData) > 0) {
            $recordDatas[] = $recordData;
        }

        // combine into one chunk with all the blocks SST, CONTINUE,...
        $chunk = '';
        foreach ($recordDatas as $i => $recordData) {
            // first block should have the SST record header, remaing should have CONTINUE header
            $record = ($i == 0) ? 0x00FC : 0x003C;

            $header = pack('vv', $record, strlen($recordData));
            $data = $header . $recordData;

            $chunk .= $this->writeData($data);
        }

        return $chunk;
    }

    /**
     * Writes the MSODRAWINGGROUP record if needed. Possibly split using CONTINUE records.
     */
    private function writeMsoDrawingGroup()
    {
        // write the Escher stream if necessary
        if (isset($this->escher)) {
            $writer = new Escher($this->escher);
            $data = $writer->close();

            $record = 0x00EB;
            $length = strlen($data);
            $header = pack('vv', $record, $length);

            return $this->writeData($header . $data);
        }

        return '';
    }

    /**
     * Get Escher object.
     *
     * @return \PhpOffice\PhpSpreadsheet\Shared\Escher
     */
    public function getEscher()
    {
        return $this->escher;
    }

    /**
     * Set Escher object.
     *
     * @param \PhpOffice\PhpSpreadsheet\Shared\Escher $pValue
     */
    public function setEscher(\PhpOffice\PhpSpreadsheet\Shared\Escher $pValue = null)
    {
        $this->escher = $pValue;
    }
}