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diff --git a/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/HeaderFooter.php b/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/HeaderFooter.php
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+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Worksheet;
+
+/**
+ * <code>
+ * Header/Footer Formatting Syntax taken from Office Open XML Part 4 - Markup Language Reference, page 1970:.
+ *
+ * There are a number of formatting codes that can be written inline with the actual header / footer text, which
+ * affect the formatting in the header or footer.
+ *
+ * Example: This example shows the text "Center Bold Header" on the first line (center section), and the date on
+ * the second line (center section).
+ *         &CCenter &"-,Bold"Bold&"-,Regular"Header_x000A_&D
+ *
+ * General Rules:
+ * There is no required order in which these codes must appear.
+ *
+ * The first occurrence of the following codes turns the formatting ON, the second occurrence turns it OFF again:
+ * - strikethrough
+ * - superscript
+ * - subscript
+ * Superscript and subscript cannot both be ON at same time. Whichever comes first wins and the other is ignored,
+ * while the first is ON.
+ * &L - code for "left section" (there are three header / footer locations, "left", "center", and "right"). When
+ * two or more occurrences of this section marker exist, the contents from all markers are concatenated, in the
+ * order of appearance, and placed into the left section.
+ * &P - code for "current page #"
+ * &N - code for "total pages"
+ * &font size - code for "text font size", where font size is a font size in points.
+ * &K - code for "text font color"
+ * RGB Color is specified as RRGGBB
+ * Theme Color is specifed as TTSNN where TT is the theme color Id, S is either "+" or "-" of the tint/shade
+ * value, NN is the tint/shade value.
+ * &S - code for "text strikethrough" on / off
+ * &X - code for "text super script" on / off
+ * &Y - code for "text subscript" on / off
+ * &C - code for "center section". When two or more occurrences of this section marker exist, the contents
+ * from all markers are concatenated, in the order of appearance, and placed into the center section.
+ *
+ * &D - code for "date"
+ * &T - code for "time"
+ * &G - code for "picture as background"
+ * &U - code for "text single underline"
+ * &E - code for "double underline"
+ * &R - code for "right section". When two or more occurrences of this section marker exist, the contents
+ * from all markers are concatenated, in the order of appearance, and placed into the right section.
+ * &Z - code for "this workbook's file path"
+ * &F - code for "this workbook's file name"
+ * &A - code for "sheet tab name"
+ * &+ - code for add to page #.
+ * &- - code for subtract from page #.
+ * &"font name,font type" - code for "text font name" and "text font type", where font name and font type
+ * are strings specifying the name and type of the font, separated by a comma. When a hyphen appears in font
+ * name, it means "none specified". Both of font name and font type can be localized values.
+ * &"-,Bold" - code for "bold font style"
+ * &B - also means "bold font style".
+ * &"-,Regular" - code for "regular font style"
+ * &"-,Italic" - code for "italic font style"
+ * &I - also means "italic font style"
+ * &"-,Bold Italic" code for "bold italic font style"
+ * &O - code for "outline style"
+ * &H - code for "shadow style"
+ * </code>
+ */
+class HeaderFooter
+{
+    // Header/footer image location
+    const IMAGE_HEADER_LEFT = 'LH';
+    const IMAGE_HEADER_CENTER = 'CH';
+    const IMAGE_HEADER_RIGHT = 'RH';
+    const IMAGE_FOOTER_LEFT = 'LF';
+    const IMAGE_FOOTER_CENTER = 'CF';
+    const IMAGE_FOOTER_RIGHT = 'RF';
+
+    /**
+     * OddHeader.
+     *
+     * @var string
+     */
+    private $oddHeader = '';
+
+    /**
+     * OddFooter.
+     *
+     * @var string
+     */
+    private $oddFooter = '';
+
+    /**
+     * EvenHeader.
+     *
+     * @var string
+     */
+    private $evenHeader = '';
+
+    /**
+     * EvenFooter.
+     *
+     * @var string
+     */
+    private $evenFooter = '';
+
+    /**
+     * FirstHeader.
+     *
+     * @var string
+     */
+    private $firstHeader = '';
+
+    /**
+     * FirstFooter.
+     *
+     * @var string
+     */
+    private $firstFooter = '';
+
+    /**
+     * Different header for Odd/Even, defaults to false.
+     *
+     * @var bool
+     */
+    private $differentOddEven = false;
+
+    /**
+     * Different header for first page, defaults to false.
+     *
+     * @var bool
+     */
+    private $differentFirst = false;
+
+    /**
+     * Scale with document, defaults to true.
+     *
+     * @var bool
+     */
+    private $scaleWithDocument = true;
+
+    /**
+     * Align with margins, defaults to true.
+     *
+     * @var bool
+     */
+    private $alignWithMargins = true;
+
+    /**
+     * Header/footer images.
+     *
+     * @var HeaderFooterDrawing[]
+     */
+    private $headerFooterImages = [];
+
+    /**
+     * Create a new HeaderFooter.
+     */
+    public function __construct()
+    {
+    }
+
+    /**
+     * Get OddHeader.
+     *
+     * @return string
+     */
+    public function getOddHeader()
+    {
+        return $this->oddHeader;
+    }
+
+    /**
+     * Set OddHeader.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setOddHeader($pValue)
+    {
+        $this->oddHeader = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get OddFooter.
+     *
+     * @return string
+     */
+    public function getOddFooter()
+    {
+        return $this->oddFooter;
+    }
+
+    /**
+     * Set OddFooter.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setOddFooter($pValue)
+    {
+        $this->oddFooter = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get EvenHeader.
+     *
+     * @return string
+     */
+    public function getEvenHeader()
+    {
+        return $this->evenHeader;
+    }
+
+    /**
+     * Set EvenHeader.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setEvenHeader($pValue)
+    {
+        $this->evenHeader = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get EvenFooter.
+     *
+     * @return string
+     */
+    public function getEvenFooter()
+    {
+        return $this->evenFooter;
+    }
+
+    /**
+     * Set EvenFooter.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setEvenFooter($pValue)
+    {
+        $this->evenFooter = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get FirstHeader.
+     *
+     * @return string
+     */
+    public function getFirstHeader()
+    {
+        return $this->firstHeader;
+    }
+
+    /**
+     * Set FirstHeader.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setFirstHeader($pValue)
+    {
+        $this->firstHeader = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get FirstFooter.
+     *
+     * @return string
+     */
+    public function getFirstFooter()
+    {
+        return $this->firstFooter;
+    }
+
+    /**
+     * Set FirstFooter.
+     *
+     * @param string $pValue
+     *
+     * @return $this
+     */
+    public function setFirstFooter($pValue)
+    {
+        $this->firstFooter = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get DifferentOddEven.
+     *
+     * @return bool
+     */
+    public function getDifferentOddEven()
+    {
+        return $this->differentOddEven;
+    }
+
+    /**
+     * Set DifferentOddEven.
+     *
+     * @param bool $pValue
+     *
+     * @return $this
+     */
+    public function setDifferentOddEven($pValue)
+    {
+        $this->differentOddEven = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get DifferentFirst.
+     *
+     * @return bool
+     */
+    public function getDifferentFirst()
+    {
+        return $this->differentFirst;
+    }
+
+    /**
+     * Set DifferentFirst.
+     *
+     * @param bool $pValue
+     *
+     * @return $this
+     */
+    public function setDifferentFirst($pValue)
+    {
+        $this->differentFirst = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get ScaleWithDocument.
+     *
+     * @return bool
+     */
+    public function getScaleWithDocument()
+    {
+        return $this->scaleWithDocument;
+    }
+
+    /**
+     * Set ScaleWithDocument.
+     *
+     * @param bool $pValue
+     *
+     * @return $this
+     */
+    public function setScaleWithDocument($pValue)
+    {
+        $this->scaleWithDocument = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Get AlignWithMargins.
+     *
+     * @return bool
+     */
+    public function getAlignWithMargins()
+    {
+        return $this->alignWithMargins;
+    }
+
+    /**
+     * Set AlignWithMargins.
+     *
+     * @param bool $pValue
+     *
+     * @return $this
+     */
+    public function setAlignWithMargins($pValue)
+    {
+        $this->alignWithMargins = $pValue;
+
+        return $this;
+    }
+
+    /**
+     * Add header/footer image.
+     *
+     * @param string $location
+     *
+     * @return $this
+     */
+    public function addImage(HeaderFooterDrawing $image, $location = self::IMAGE_HEADER_LEFT)
+    {
+        $this->headerFooterImages[$location] = $image;
+
+        return $this;
+    }
+
+    /**
+     * Remove header/footer image.
+     *
+     * @param string $location
+     *
+     * @return $this
+     */
+    public function removeImage($location = self::IMAGE_HEADER_LEFT)
+    {
+        if (isset($this->headerFooterImages[$location])) {
+            unset($this->headerFooterImages[$location]);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set header/footer images.
+     *
+     * @param HeaderFooterDrawing[] $images
+     *
+     * @return $this
+     */
+    public function setImages(array $images)
+    {
+        $this->headerFooterImages = $images;
+
+        return $this;
+    }
+
+    /**
+     * Get header/footer images.
+     *
+     * @return HeaderFooterDrawing[]
+     */
+    public function getImages()
+    {
+        // Sort array
+        $images = [];
+        if (isset($this->headerFooterImages[self::IMAGE_HEADER_LEFT])) {
+            $images[self::IMAGE_HEADER_LEFT] = $this->headerFooterImages[self::IMAGE_HEADER_LEFT];
+        }
+        if (isset($this->headerFooterImages[self::IMAGE_HEADER_CENTER])) {
+            $images[self::IMAGE_HEADER_CENTER] = $this->headerFooterImages[self::IMAGE_HEADER_CENTER];
+        }
+        if (isset($this->headerFooterImages[self::IMAGE_HEADER_RIGHT])) {
+            $images[self::IMAGE_HEADER_RIGHT] = $this->headerFooterImages[self::IMAGE_HEADER_RIGHT];
+        }
+        if (isset($this->headerFooterImages[self::IMAGE_FOOTER_LEFT])) {
+            $images[self::IMAGE_FOOTER_LEFT] = $this->headerFooterImages[self::IMAGE_FOOTER_LEFT];
+        }
+        if (isset($this->headerFooterImages[self::IMAGE_FOOTER_CENTER])) {
+            $images[self::IMAGE_FOOTER_CENTER] = $this->headerFooterImages[self::IMAGE_FOOTER_CENTER];
+        }
+        if (isset($this->headerFooterImages[self::IMAGE_FOOTER_RIGHT])) {
+            $images[self::IMAGE_FOOTER_RIGHT] = $this->headerFooterImages[self::IMAGE_FOOTER_RIGHT];
+        }
+        $this->headerFooterImages = $images;
+
+        return $this->headerFooterImages;
+    }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $vars = get_object_vars($this);
+        foreach ($vars as $key => $value) {
+            if (is_object($value)) {
+                $this->$key = clone $value;
+            } else {
+                $this->$key = $value;
+            }
+        }
+    }
+}