vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xls/Escher.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Xls;

use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DgContainer;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DgContainer\SpgrContainer;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DgContainer\SpgrContainer\SpContainer;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DggContainer;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DggContainer\BstoreContainer;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DggContainer\BstoreContainer\BSE;
use PhpOffice\PhpSpreadsheet\Shared\Escher\DggContainer\BstoreContainer\BSE\Blip;

class Escher
{
    /**
     * The object we are writing.
     */
    private $object;

    /**
     * The written binary data.
     */
    private $data;

    /**
     * Shape offsets. Positions in binary stream where a new shape record begins.
     *
     * @var array
     */
    private $spOffsets;

    /**
     * Shape types.
     *
     * @var array
     */
    private $spTypes;

    /**
     * Constructor.
     *
     * @param mixed $object
     */
    public function __construct($object)
    {
        $this->object = $object;
    }

    /**
     * Process the object to be written.
     *
     * @return string
     */
    public function close()
    {
        // initialize
        $this->data = '';

        switch (get_class($this->object)) {