Workbook.php

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<?php
 
namespace PhpOffice\PhpSpreadsheet\Writer\Xls;
 
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\DefinedName;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
use PhpOffice\PhpSpreadsheet\Shared\Date;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Style\Style;
 
// 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
{
    private $parser;
 
    private $biffSize;
 
    private $xfWriters = [];
 
    private $palette;
 
    private $codepage;
 
    private $countryCode;
 
    private $spreadsheet;
 
    private $fontWriters = [];
 
    private $addedFonts = [];
 
    private $numberFormats = [];
 
    private $addedNumberFormats = [];
 
    private $worksheetSizes = [];
 
    private $worksheetOffsets = [];
 
    private $stringTotal;
 
    private $stringUnique;
 
    private $stringTable;
 
    private $colors;
 
    private $escher;
 
    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());
            }
        }
    }
 
    public function addXfWriter(Style $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;
 
        return count($this->xfWriters) - 1;
    }
 
    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;
    }
 
    private function addColor($rgb)
    {
        if (!isset($this->colors[$rgb])) {
            $color =
                [
                    hexdec(substr($rgb, 0, 2)),
                    hexdec(substr($rgb, 2, 2)),
                    hexdec(substr($rgb, 4)),
                    0,
                ];
            $colorIndex = array_search($color, $this->palette);
            if ($colorIndex) {
                $this->colors[$rgb] = $colorIndex;
            } else {
                if (count($this->colors) === 0) {
                    $lastColor = 7;
                } else {
                    $lastColor = end($this->colors);
                }
                if ($lastColor < 57) {
                    // then we add a custom color altering the palette
                    $colorIndex = $lastColor + 1;
                    $this->palette[$colorIndex] = $color;
                    $this->colors[$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;
    }
 
    private function setPaletteXl97(): void
    {
        $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],
        ];
    }
 
    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;
    }
 
    private function calcSheetOffsets(): void
    {
        $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;
    }
 
    private function writeAllFonts(): void
    {
        foreach ($this->fontWriters as $fontWriter) {
            $this->append($fontWriter->writeFont());
        }
    }
 
    private function writeAllNumberFormats(): void
    {
        foreach ($this->numberFormats as $numberFormatIndex => $numberFormat) {
            $this->writeNumberFormat($numberFormat->getFormatCode(), $numberFormatIndex);
        }
    }
 
    private function writeAllXfs(): void
    {
        foreach ($this->xfWriters as $xfWriter) {
            $this->append($xfWriter->writeXf());
        }
    }
 
    private function writeAllStyles(): void
    {
        $this->writeStyle();
    }
 
    private function parseDefinedNameValue(DefinedName $pDefinedName): string
    {
        $definedRange = $pDefinedName->getValue();
        $splitCount = preg_match_all(
            '/' . Calculation::CALCULATION_REGEXP_CELLREF . '/mui',
            $definedRange,
            $splitRanges,
            PREG_OFFSET_CAPTURE
        );
 
        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
        $offsets = array_column($splitRanges[0], 1);
 
        $worksheets = $splitRanges[2];
        $columns = $splitRanges[6];
        $rows = $splitRanges[7];
 
        while ($splitCount > 0) {
            --$splitCount;
            $length = $lengths[$splitCount];
            $offset = $offsets[$splitCount];
            $worksheet = $worksheets[$splitCount][0];
            $column = $columns[$splitCount][0];
            $row = $rows[$splitCount][0];
 
            $newRange = '';
            if (empty($worksheet)) {
                if (($offset === 0) || ($definedRange[$offset - 1] !== ':')) {
                    // We should have a worksheet
                    $worksheet = $pDefinedName->getWorksheet() ? $pDefinedName->getWorksheet()->getTitle() : null;
                }
            } else {
                $worksheet = str_replace("''", "'", trim($worksheet, "'"));
            }
            if (!empty($worksheet)) {
                $newRange = "'" . str_replace("'", "''", $worksheet) . "'!";
            }
 
            if (!empty($column)) {
                $newRange .= "\${$column}";
            }
            if (!empty($row)) {
                $newRange .= "\${$row}";
            }
 
            $definedRange = substr($definedRange, 0, $offset) . $newRange . substr($definedRange, $offset + $length);
        }
 
        return $definedRange;
    }
 
    private function writeAllDefinedNamesBiff8()
    {
        $chunk = '';
 
        // Named ranges
        $definedNames = $this->spreadsheet->getDefinedNames();
        if (count($definedNames) > 0) {
            // Loop named ranges
            foreach ($definedNames as $definedName) {
                $range = $this->parseDefinedNameValue($definedName);
 
                // parse formula
                try {
                    $error = $this->parser->parse($range);
                    $formulaData = $this->parser->toReversePolish();
 
                    // make sure tRef3d is of type tRef3dR (0x3A)
                    if (isset($formulaData[0]) && ($formulaData[0] == "\x7A" || $formulaData[0] == "\x5A")) {
                        $formulaData = "\x3A" . substr($formulaData, 1);
                    }
 
                    if ($definedName->getLocalOnly()) {
                        // local scope
                        $scope = $this->spreadsheet->getIndex($definedName->getScope()) + 1;
                    } else {
                        // global scope
                        $scope = 0;
                    }
                    $chunk .= $this->writeData($this->writeDefinedNameBiff8($definedName->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();
                $colmin = Coordinate::columnIndexFromString($repeat[0]) - 1;
                $colmax = Coordinate::columnIndexFromString($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()) {
                    $repeat = $sheetSetup->getColumnsToRepeatAtLeft();
                    $colmin = Coordinate::columnIndexFromString($repeat[0]) - 1;
                    $colmax = Coordinate::columnIndexFromString($repeat[1]) - 1;
                } else {
                    $colmin = 0;
                    $colmax = 255;
                }
                // Rows to repeat
                if ($sheetSetup->isRowsToRepeatAtTopSet()) {
                    $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
                $printArea = Coordinate::splitRange($sheetSetup->getPrintArea());
                $countPrintArea = count($printArea);
 
                $formulaData = '';
                for ($j = 0; $j < $countPrintArea; ++$j) {
                    $printAreaRect = $printArea[$j]; // e.g. A3:J6
                    $printAreaRect[0] = Coordinate::indexesFromString($printAreaRect[0]);
                    $printAreaRect[1] = Coordinate::indexesFromString($printAreaRect[1]);
 
                    $print_rowmin = $printAreaRect[0][1] - 1;
                    $print_rowmax = $printAreaRect[1][1] - 1;
                    $print_colmin = $printAreaRect[0][0] - 1;
                    $print_colmax = $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)) {
                $rangeBounds = Coordinate::rangeBoundaries($autoFilterRange);
 
                //Autofilter built in name
                $name = pack('C', 0x0D);
 
                $chunk .= $this->writeData($this->writeShortNameBiff8($name, $i + 1, $rangeBounds, true));
            }
        }
 
        return $chunk;
    }
 
    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;
    }
 
    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;
    }
 
    private function writeCodepage(): void
    {
        $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);
    }
 
    private function writeWindow1(): void
    {
        $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);
    }
 
    private function writeBoundSheet(\PhpOffice\PhpSpreadsheet\Worksheet\Worksheet $sheet, $offset): void
    {
        $sheetname = $sheet->getTitle();
        $record = 0x0085; // Record identifier
 
        // sheet state
        switch ($sheet->getSheetState()) {
            case \PhpOffice\PhpSpreadsheet\Worksheet\Worksheet::SHEETSTATE_VISIBLE:
                $ss = 0x00;
 
                break;
            case \PhpOffice\PhpSpreadsheet\Worksheet\Worksheet::SHEETSTATE_HIDDEN:
                $ss = 0x01;
 
                break;
            case \PhpOffice\PhpSpreadsheet\Worksheet\Worksheet::SHEETSTATE_VERYHIDDEN:
                $ss = 0x02;
 
                break;
            default:
                $ss = 0x00;
 
                break;
        }
 
        // sheet type
        $st = 0x00;
 
        $grbit = 0x0000; // Visibility and sheet type
 
        $data = pack('VCC', $offset, $ss, $st);
        $data .= StringHelper::UTF8toBIFF8UnicodeShort($sheetname);
 
        $length = strlen($data);
        $header = pack('vv', $record, $length);
        $this->append($header . $data);
    }
 
    private function writeSupbookInternal()
    {
        $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);
    }
 
    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
        $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);
    }
 
    private function writeStyle(): void
    {
        $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);
    }
 
    private function writeNumberFormat($format, $ifmt): void
    {
        $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);
    }
 
    private function writeDateMode(): void
    {
        $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);
    }
 
    private function writeCountry()
    {
        $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);
    }
 
    private function writeRecalcId()
    {
        $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);
    }
 
    private function writePalette(): void
    {
        $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);
    }
 
    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;
    }
 
    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 '';
    }
 
    public function getEscher()
    {
        return $this->escher;
    }
 
    public function setEscher(?\PhpOffice\PhpSpreadsheet\Shared\Escher $pValue = null): void
    {
        $this->escher = $pValue;
    }
}