<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * 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   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version	##VERSION##, ##DATE##
 */


/**
 * PHPExcel_Writer_Excel5
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel5 extends PHPExcel_Writer_Abstract implements PHPExcel_Writer_IWriter
{
	/**
	 * PHPExcel object
	 *
	 * @var PHPExcel
	 */
	private $_phpExcel;

	/**
	 * Total number of shared strings in workbook
	 *
	 * @var int
	 */
	private $_str_total		= 0;

	/**
	 * Number of unique shared strings in workbook
	 *
	 * @var int
	 */
	private $_str_unique	= 0;

	/**
	 * Array of unique shared strings in workbook
	 *
	 * @var array
	 */
	private $_str_table		= array();

	/**
	 * Color cache. Mapping between RGB value and color index.
	 *
	 * @var array
	 */
	private $_colors;

	/**
	 * Formula parser
	 *
	 * @var PHPExcel_Writer_Excel5_Parser
	 */
	private $_parser;

	/**
	 * Identifier clusters for drawings. Used in MSODRAWINGGROUP record.
	 *
	 * @var array
	 */
	private $_IDCLs;

	/**
	 * Basic OLE object summary information
	 *
	 * @var array
	 */
	private $_summaryInformation;

	/**
	 * Extended OLE object document summary information
	 *
	 * @var array
	 */
	private $_documentSummaryInformation;

	/**
	 * Create a new PHPExcel_Writer_Excel5
	 *
	 * @param	PHPExcel	$phpExcel	PHPExcel object
	 */
	public function __construct(PHPExcel $phpExcel) {
		$this->_phpExcel	= $phpExcel;

		$this->_parser		= new PHPExcel_Writer_Excel5_Parser();
	}

	/**
	 * Save PHPExcel to file
	 *
	 * @param	string		$pFilename
	 * @throws	PHPExcel_Writer_Exception
	 */
	public function save($pFilename = null) {

		// garbage collect
		$this->_phpExcel->garbageCollect();

		$saveDebugLog = PHPExcel_Calculation::getInstance($this->_phpExcel)->getDebugLog()->getWriteDebugLog();
		PHPExcel_Calculation::getInstance($this->_phpExcel)->getDebugLog()->setWriteDebugLog(FALSE);
		$saveDateReturnType = PHPExcel_Calculation_Functions::getReturnDateType();
		PHPExcel_Calculation_Functions::setReturnDateType(PHPExcel_Calculation_Functions::RETURNDATE_EXCEL);

		// initialize colors array
		$this->_colors          = array();

		// Initialise workbook writer
		$this->_writerWorkbook = new PHPExcel_Writer_Excel5_Workbook($this->_phpExcel,
																	 $this->_str_total, $this->_str_unique, $this->_str_table,
																	 $this->_colors, $this->_parser);

		// Initialise worksheet writers
		$countSheets = $this->_phpExcel->getSheetCount();
		for ($i = 0; $i < $countSheets; ++$i) {
			$this->_writerWorksheets[$i] = new PHPExcel_Writer_Excel5_Worksheet($this->_str_total, $this->_str_unique,
																			   $this->_str_table, $this->_colors,
																			   $this->_parser,
																			   $this->_preCalculateFormulas,
																			   $this->_phpExcel->getSheet($i));
		}

		// build Escher objects. Escher objects for workbooks needs to be build before Escher object for workbook.
		$this->_buildWorksheetEschers();
		$this->_buildWorkbookEscher();

		// add 15 identical cell style Xfs
		// for now, we use the first cellXf instead of cellStyleXf
		$cellXfCollection = $this->_phpExcel->getCellXfCollection();
		for ($i = 0; $i < 15; ++$i) {
			$this->_writerWorkbook->addXfWriter($cellXfCollection[0], true);
		}

		// add all the cell Xfs
		foreach ($this->_phpExcel->getCellXfCollection() as $style) {
			$this->_writerWorkbook->addXfWriter($style, false);
		}

		// add fonts from rich text eleemnts
		for ($i = 0; $i < $countSheets; ++$i) {
			foreach ($this->_writerWorksheets[$i]->_phpSheet->getCellCollection() as $cellID) {
				$cell = $this->_writerWorksheets[$i]->_phpSheet->getCell($cellID);
				$cVal = $cell->getValue();
				if ($cVal instanceof PHPExcel_RichText) {
					$elements = $cVal->getRichTextElements();
					foreach ($elements as $element) {
						if ($element instanceof PHPExcel_RichText_Run) {
							$font = $element->getFont();
							$this->_writerWorksheets[$i]->_fntHashIndex[$font->getHashCode()] = $this->_writerWorkbook->_addFont($font);
						}
					}
				}
			}
		}

		// initialize OLE file
		$workbookStreamName = 'Workbook';
		$OLE = new PHPExcel_Shared_OLE_PPS_File(PHPExcel_Shared_OLE::Asc2Ucs($workbookStreamName));

		// Write the worksheet streams before the global workbook stream,
		// because the byte sizes of these are needed in the global workbook stream
		$worksheetSizes = array();
		for ($i = 0; $i < $countSheets; ++$i) {
			$this->_writerWorksheets[$i]->close();
			$worksheetSizes[] = $this->_writerWorksheets[$i]->_datasize;
		}

		// add binary data for global workbook stream
		$OLE->append($this->_writerWorkbook->writeWorkbook($worksheetSizes));

		// add binary data for sheet streams
		for ($i = 0; $i < $countSheets; ++$i) {
			$OLE->append($this->_writerWorksheets[$i]->getData());
		}

		$this->_documentSummaryInformation = $this->_writeDocumentSummaryInformation();
		// initialize OLE Document Summary Information
		if(isset($this->_documentSummaryInformation) && !empty($this->_documentSummaryInformation)){
			$OLE_DocumentSummaryInformation = new PHPExcel_Shared_OLE_PPS_File(PHPExcel_Shared_OLE::Asc2Ucs(chr(5) . 'DocumentSummaryInformation'));
			$OLE_DocumentSummaryInformation->append($this->_documentSummaryInformation);
		}

		$this->_summaryInformation = $this->_writeSummaryInformation();
		// initialize OLE Summary Information
		if(isset($this->_summaryInformation) && !empty($this->_summaryInformation)){
		  $OLE_SummaryInformation = new PHPExcel_Shared_OLE_PPS_File(PHPExcel_Shared_OLE::Asc2Ucs(chr(5) . 'SummaryInformation'));
		  $OLE_SummaryInformation->append($this->_summaryInformation);
		}

		// define OLE Parts
		$arrRootData = array($OLE);
		// initialize OLE Properties file
		if(isset($OLE_SummaryInformation)){
			$arrRootData[] = $OLE_SummaryInformation;
		}
		// initialize OLE Extended Properties file
		if(isset($OLE_DocumentSummaryInformation)){
			$arrRootData[] = $OLE_DocumentSummaryInformation;
		}

		$root = new PHPExcel_Shared_OLE_PPS_Root(time(), time(), $arrRootData);
		// save the OLE file
		$res = $root->save($pFilename);

		PHPExcel_Calculation_Functions::setReturnDateType($saveDateReturnType);
		PHPExcel_Calculation::getInstance($this->_phpExcel)->getDebugLog()->setWriteDebugLog($saveDebugLog);
	}

	/**
	 * Set temporary storage directory
	 *
	 * @deprecated
	 * @param	string	$pValue		Temporary storage directory
	 * @throws	PHPExcel_Writer_Exception	when directory does not exist
	 * @return PHPExcel_Writer_Excel5
	 */
	public function setTempDir($pValue = '') {
		return $this;
	}

	/**
	 * Build the Worksheet Escher objects
	 *
	 */
	private function _buildWorksheetEschers()
	{
		// 1-based index to BstoreContainer
		$blipIndex = 0;
		$lastReducedSpId = 0;
		$lastSpId = 0;

		foreach ($this->_phpExcel->getAllsheets() as $sheet) {
			// sheet index
			$sheetIndex = $sheet->getParent()->getIndex($sheet);

			$escher = null;

			// check if there are any shapes for this sheet
			$filterRange = $sheet->getAutoFilter()->getRange();
			if (count($sheet->getDrawingCollection()) == 0 && empty($filterRange)) {
				continue;
			}

			// create intermediate Escher object
			$escher = new PHPExcel_Shared_Escher();

			// dgContainer
			$dgContainer = new PHPExcel_Shared_Escher_DgContainer();

			// set the drawing index (we use sheet index + 1)
			$dgId = $sheet->getParent()->getIndex($sheet) + 1;
			$dgContainer->setDgId($dgId);
			$escher->setDgContainer($dgContainer);

			// spgrContainer
			$spgrContainer = new PHPExcel_Shared_Escher_DgContainer_SpgrContainer();
			$dgContainer->setSpgrContainer($spgrContainer);

			// add one shape which is the group shape
			$spContainer = new PHPExcel_Shared_Escher_DgContainer_SpgrContainer_SpContainer();
			$spContainer->setSpgr(true);
			$spContainer->setSpType(0);
			$spContainer->setSpId(($sheet->getParent()->getIndex($sheet) + 1) << 10);
			$spgrContainer->addChild($spContainer);

			// add the shapes

			$countShapes[$sheetIndex] = 0; // count number of shapes (minus group shape), in sheet

			foreach ($sheet->getDrawingCollection() as $drawing) {
				++$blipIndex;

				++$countShapes[$sheetIndex];

				// add the shape
				$spContainer = new PHPExcel_Shared_Escher_DgContainer_SpgrContainer_SpContainer();

				// set the shape type
				$spContainer->setSpType(0x004B);
				// set the shape flag
				$spContainer->setSpFlag(0x02);

				// set the shape index (we combine 1-based sheet index and $countShapes to create unique shape index)
				$reducedSpId = $countShapes[$sheetIndex];
				$spId = $reducedSpId
					| ($sheet->getParent()->getIndex($sheet) + 1) << 10;
				$spContainer->setSpId($spId);

				// keep track of last reducedSpId
				$lastReducedSpId = $reducedSpId;

				// keep track of last spId
				$lastSpId = $spId;

				// set the BLIP index
				$spContainer->setOPT(0x4104, $blipIndex);

				// set coordinates and offsets, client anchor
				$coordinates = $drawing->getCoordinates();
				$offsetX = $drawing->getOffsetX();
				$offsetY = $drawing->getOffsetY();
				$width = $drawing->getWidth();
				$height = $drawing->getHeight();

				$twoAnchor = PHPExcel_Shared_Excel5::oneAnchor2twoAnchor($sheet, $coordinates, $offsetX, $offsetY, $width, $height);

				$spContainer->setStartCoordinates($twoAnchor['startCoordinates']);
				$spContainer->setStartOffsetX($twoAnchor['startOffsetX']);
				$spContainer->setStartOffsetY($twoAnchor['startOffsetY']);
				$spContainer->setEndCoordinates($twoAnchor['endCoordinates']);
				$spContainer->setEndOffsetX($twoAnchor['endOffsetX']);
				$spContainer->setEndOffsetY($twoAnchor['endOffsetY']);

				$spgrContainer->addChild($spContainer);
			}

			// AutoFilters
			if(!empty($filterRange)){
				$rangeBounds = PHPExcel_Cell::rangeBoundaries($filterRange);
				$iNumColStart = $rangeBounds[0][0];
				$iNumColEnd = $rangeBounds[1][0];

				$iInc = $iNumColStart;
				while($iInc <= $iNumColEnd){
					++$countShapes[$sheetIndex];

					// create an Drawing Object for the dropdown
					$oDrawing  = new PHPExcel_Worksheet_BaseDrawing();
					// get the coordinates of drawing
					$cDrawing   = PHPExcel_Cell::stringFromColumnIndex($iInc - 1) . $rangeBounds[0][1];
					$oDrawing->setCoordinates($cDrawing);
					$oDrawing->setWorksheet($sheet);

					// add the shape
					$spContainer = new PHPExcel_Shared_Escher_DgContainer_SpgrContainer_SpContainer();
					// set the shape type
					$spContainer->setSpType(0x00C9);
					// set the shape flag
					$spContainer->setSpFlag(0x01);

					// set the shape index (we combine 1-based sheet index and $countShapes to create unique shape index)
					$reducedSpId = $countShapes[$sheetIndex];
					$spId = $reducedSpId
						| ($sheet->getParent()->getIndex($sheet) + 1) << 10;
					$spContainer->setSpId($spId);

					// keep track of last reducedSpId
					$lastReducedSpId = $reducedSpId;

					// keep track of last spId
					$lastSpId = $spId;

					$spContainer->setOPT(0x007F, 0x01040104); // Protection -> fLockAgainstGrouping
					$spContainer->setOPT(0x00BF, 0x00080008); // Text -> fFitTextToShape
					$spContainer->setOPT(0x01BF, 0x00010000); // Fill Style -> fNoFillHitTest
					$spContainer->setOPT(0x01FF, 0x00080000); // Line Style -> fNoLineDrawDash
					$spContainer->setOPT(0x03BF, 0x000A0000); // Group Shape -> fPrint

					// set coordinates and offsets, client anchor
					$endCoordinates = PHPExcel_Cell::stringFromColumnIndex(PHPExcel_Cell::stringFromColumnIndex($iInc - 1));
					$endCoordinates .= $rangeBounds[0][1] + 1;

					$spContainer->setStartCoordinates($cDrawing);
					$spContainer->setStartOffsetX(0);
					$spContainer->setStartOffsetY(0);
					$spContainer->setEndCoordinates($endCoordinates);
					$spContainer->setEndOffsetX(0);
					$spContainer->setEndOffsetY(0);

					$spgrContainer->addChild($spContainer);
					$iInc++;
				}
			}

			// identifier clusters, used for workbook Escher object
			$this->_IDCLs[$dgId] = $lastReducedSpId;

			// set last shape index
			$dgContainer->setLastSpId($lastSpId);

			// set the Escher object
			$this->_writerWorksheets[$sheetIndex]->setEscher($escher);
		}
	}

	/**
	 * Build the Escher object corresponding to the MSODRAWINGGROUP record
	 */
	private function _buildWorkbookEscher()
	{
		$escher = null;

		// any drawings in this workbook?
		$found = false;
		foreach ($this->_phpExcel->getAllSheets() as $sheet) {
			if (count($sheet->getDrawingCollection()) > 0) {
				$found = true;
				break;
			}
		}

		// nothing to do if there are no drawings
		if (!$found) {
			return;
		}

		// if we reach here, then there are drawings in the workbook
		$escher = new PHPExcel_Shared_Escher();

		// dggContainer
		$dggContainer = new PHPExcel_Shared_Escher_DggContainer();
		$escher->setDggContainer($dggContainer);

		// set IDCLs (identifier clusters)
		$dggContainer->setIDCLs($this->_IDCLs);

		// this loop is for determining maximum shape identifier of all drawing
		$spIdMax = 0;
		$totalCountShapes = 0;
		$countDrawings = 0;

		foreach ($this->_phpExcel->getAllsheets() as $sheet) {
			$sheetCountShapes = 0; // count number of shapes (minus group shape), in sheet

			if (count($sheet->getDrawingCollection()) > 0) {
				++$countDrawings;

				foreach ($sheet->getDrawingCollection() as $drawing) {
					++$sheetCountShapes;
					++$totalCountShapes;

					$spId = $sheetCountShapes
						| ($this->_phpExcel->getIndex($sheet) + 1) << 10;
					$spIdMax = max($spId, $spIdMax);
				}
			}
		}

		$dggContainer->setSpIdMax($spIdMax + 1);
		$dggContainer->setCDgSaved($countDrawings);
		$dggContainer->setCSpSaved($totalCountShapes + $countDrawings); // total number of shapes incl. one group shapes per drawing

		// bstoreContainer
		$bstoreContainer = new PHPExcel_Shared_Escher_DggContainer_BstoreContainer();
		$dggContainer->setBstoreContainer($bstoreContainer);

		// the BSE's (all the images)
		foreach ($this->_phpExcel->getAllsheets() as $sheet) {
			foreach ($sheet->getDrawingCollection() as $drawing) {
				if ($drawing instanceof PHPExcel_Worksheet_Drawing) {

					$filename = $drawing->getPath();

					list($imagesx, $imagesy, $imageFormat) = getimagesize($filename);

					switch ($imageFormat) {

					case 1: // GIF, not supported by BIFF8, we convert to PNG
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_PNG;
						ob_start();
						imagepng(imagecreatefromgif($filename));
						$blipData = ob_get_contents();
						ob_end_clean();
						break;

					case 2: // JPEG
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_JPEG;
						$blipData = file_get_contents($filename);
						break;

					case 3: // PNG
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_PNG;
						$blipData = file_get_contents($filename);
						break;

					case 6: // Windows DIB (BMP), we convert to PNG
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_PNG;
						ob_start();
						imagepng(PHPExcel_Shared_Drawing::imagecreatefrombmp($filename));
						$blipData = ob_get_contents();
						ob_end_clean();
						break;

					default: continue 2;

					}

					$blip = new PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE_Blip();
					$blip->setData($blipData);

					$BSE = new PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE();
					$BSE->setBlipType($blipType);
					$BSE->setBlip($blip);

					$bstoreContainer->addBSE($BSE);

				} else if ($drawing instanceof PHPExcel_Worksheet_MemoryDrawing) {

					switch ($drawing->getRenderingFunction()) {

					case PHPExcel_Worksheet_MemoryDrawing::RENDERING_JPEG:
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_JPEG;
						$renderingFunction = 'imagejpeg';
						break;

					case PHPExcel_Worksheet_MemoryDrawing::RENDERING_GIF:
					case PHPExcel_Worksheet_MemoryDrawing::RENDERING_PNG:
					case PHPExcel_Worksheet_MemoryDrawing::RENDERING_DEFAULT:
						$blipType = PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_PNG;
						$renderingFunction = 'imagepng';
						break;

					}

					ob_start();
					call_user_func($renderingFunction, $drawing->getImageResource());
					$blipData = ob_get_contents();
					ob_end_clean();

					$blip = new PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE_Blip();
					$blip->setData($blipData);

					$BSE = new PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE();
					$BSE->setBlipType($blipType);
					$BSE->setBlip($blip);

					$bstoreContainer->addBSE($BSE);
				}
			}
		}

		// Set the Escher object
		$this->_writerWorkbook->setEscher($escher);
	}

	/**
	 * Build the OLE Part for DocumentSummary Information
	 * @return string
	 */
	private function _writeDocumentSummaryInformation(){

		// offset: 0; size: 2; must be 0xFE 0xFF (UTF-16 LE byte order mark)
		$data = pack('v', 0xFFFE);
		// offset: 2; size: 2;
		$data .= pack('v', 0x0000);
		// offset: 4; size: 2; OS version
		$data .= pack('v', 0x0106);
		// offset: 6; size: 2; OS indicator
		$data .= pack('v', 0x0002);
		// offset: 8; size: 16
		$data .= pack('VVVV', 0x00, 0x00, 0x00, 0x00);
		// offset: 24; size: 4; section count
		$data .= pack('V', 0x0001);

		// offset: 28; size: 16; first section's class id: 02 d5 cd d5 9c 2e 1b 10 93 97 08 00 2b 2c f9 ae
		$data .= pack('vvvvvvvv', 0xD502, 0xD5CD, 0x2E9C, 0x101B, 0x9793, 0x0008, 0x2C2B, 0xAEF9);
		// offset: 44; size: 4; offset of the start
		$data .= pack('V', 0x30);

		// SECTION
		$dataSection = array();
		$dataSection_NumProps = 0;
		$dataSection_Summary = '';
		$dataSection_Content = '';

		// GKPIDDSI_CODEPAGE: CodePage
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x01),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x02), // 2 byte signed integer
							   'data'	=> array('data' => 1252));
		$dataSection_NumProps++;

		// GKPIDDSI_CATEGORY : Category
		if($this->_phpExcel->getProperties()->getCategory()){
			$dataProp = $this->_phpExcel->getProperties()->getCategory();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x02),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E),
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		// GKPIDDSI_VERSION :Version of the application that wrote the property storage
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x17),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x03),
							   'data'	=> array('pack' => 'V', 'data' => 0x000C0000));
		$dataSection_NumProps++;
		// GKPIDDSI_SCALE : FALSE
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x0B),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x0B),
							   'data'	=> array('data' => false));
		$dataSection_NumProps++;
		// GKPIDDSI_LINKSDIRTY : True if any of the values for the linked properties have changed outside of the application
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x10),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x0B),
							   'data'	=> array('data' => false));
		$dataSection_NumProps++;
		// GKPIDDSI_SHAREDOC : FALSE
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x13),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x0B),
							   'data'	=> array('data' => false));
		$dataSection_NumProps++;
		// GKPIDDSI_HYPERLINKSCHANGED : True if any of the values for the _PID_LINKS (hyperlink text) have changed outside of the application
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x16),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x0B),
							   'data'	=> array('data' => false));
		$dataSection_NumProps++;

		// GKPIDDSI_DOCSPARTS
		// MS-OSHARED p75 (2.3.3.2.2.1)
		// Structure is VtVecUnalignedLpstrValue (2.3.3.1.9)
		// cElements
		$dataProp = pack('v', 0x0001);
		$dataProp .= pack('v', 0x0000);
		// array of UnalignedLpstr
		  // cch
		  $dataProp .= pack('v', 0x000A);
		  $dataProp .= pack('v', 0x0000);
		  // value
		  $dataProp .= 'Worksheet'.chr(0);

		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x0D),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x101E),
							   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
		$dataSection_NumProps++;

		// GKPIDDSI_HEADINGPAIR
		// VtVecHeadingPairValue
		  // cElements
		  $dataProp = pack('v', 0x0002);
		  $dataProp .= pack('v', 0x0000);
		  // Array of vtHeadingPair
		    // vtUnalignedString - headingString
		      // stringType
		      $dataProp .= pack('v', 0x001E);
		      // padding
		      $dataProp .= pack('v', 0x0000);
		      // UnalignedLpstr
		        // cch
		        $dataProp .= pack('v', 0x0013);
		        $dataProp .= pack('v', 0x0000);
		        // value
		        $dataProp .= 'Feuilles de calcul';
		    // vtUnalignedString - headingParts
		      // wType : 0x0003 = 32 bit signed integer
		      $dataProp .= pack('v', 0x0300);
		      // padding
		      $dataProp .= pack('v', 0x0000);
		      // value
		      $dataProp .= pack('v', 0x0100);
		      $dataProp .= pack('v', 0x0000);
			  $dataProp .= pack('v', 0x0000);
		      $dataProp .= pack('v', 0x0000);

        $dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x0C),
        					   'offset' => array('pack' => 'V'),
        					   'type' 	=> array('pack' => 'V', 'data' => 0x100C),
        					   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
        $dataSection_NumProps++;

		// 		4 	Section Length
		//		4 	Property count
		//		8 * $dataSection_NumProps (8 =  ID (4) + OffSet(4))
		$dataSection_Content_Offset = 8 + $dataSection_NumProps * 8;
		foreach ($dataSection as $dataProp){
			// Summary
			$dataSection_Summary .= pack($dataProp['summary']['pack'], $dataProp['summary']['data']);
			// Offset
			$dataSection_Summary .= pack($dataProp['offset']['pack'], $dataSection_Content_Offset);
			// DataType
			$dataSection_Content .= pack($dataProp['type']['pack'], $dataProp['type']['data']);
			// Data
			if($dataProp['type']['data'] == 0x02){ // 2 byte signed integer
				$dataSection_Content .= pack('V', $dataProp['data']['data']);

				$dataSection_Content_Offset += 4 + 4;
			}
			elseif($dataProp['type']['data'] == 0x03){ // 4 byte signed integer
				$dataSection_Content .= pack('V', $dataProp['data']['data']);

				$dataSection_Content_Offset += 4 + 4;
			}
			elseif($dataProp['type']['data'] == 0x0B){ // Boolean
				if($dataProp['data']['data'] == false){
					$dataSection_Content .= pack('V', 0x0000);
				} else {
					$dataSection_Content .= pack('V', 0x0001);
				}
				$dataSection_Content_Offset += 4 + 4;
			}
			elseif($dataProp['type']['data'] == 0x1E){ // null-terminated string prepended by dword string length
				// Null-terminated string
				$dataProp['data']['data'] .= chr(0);
				$dataProp['data']['length'] += 1;
				// Complete the string with null string for being a %4
				$dataProp['data']['length'] = $dataProp['data']['length'] + ((4 - $dataProp['data']['length'] % 4)==4 ? 0 : (4 - $dataProp['data']['length'] % 4));
				$dataProp['data']['data'] = str_pad($dataProp['data']['data'], $dataProp['data']['length'], chr(0), STR_PAD_RIGHT);

				$dataSection_Content .= pack('V', $dataProp['data']['length']);
				$dataSection_Content .= $dataProp['data']['data'];

				$dataSection_Content_Offset += 4 + 4 + strlen($dataProp['data']['data']);
			}
			elseif($dataProp['type']['data'] == 0x40){ // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
				$dataSection_Content .= $dataProp['data']['data'];

				$dataSection_Content_Offset += 4 + 8;
			}
			else {
				// Data Type Not Used at the moment
				$dataSection_Content .= $dataProp['data']['data'];

				$dataSection_Content_Offset += 4 + $dataProp['data']['length'];
			}
		}
		// Now $dataSection_Content_Offset contains the size of the content

		// section header
		// offset: $secOffset; size: 4; section length
		// 		+ x  Size of the content (summary + content)
		$data .= pack('V', $dataSection_Content_Offset);
		// offset: $secOffset+4; size: 4; property count
		$data .= pack('V', $dataSection_NumProps);
		// Section Summary
		$data .= $dataSection_Summary;
		// Section Content
		$data .= $dataSection_Content;

		return $data;
	}

	/**
	 * Build the OLE Part for Summary Information
	 * @return string
	 */
	private function _writeSummaryInformation(){
		// offset: 0; size: 2; must be 0xFE 0xFF (UTF-16 LE byte order mark)
		$data = pack('v', 0xFFFE);
		// offset: 2; size: 2;
		$data .= pack('v', 0x0000);
		// offset: 4; size: 2; OS version
		$data .= pack('v', 0x0106);
		// offset: 6; size: 2; OS indicator
		$data .= pack('v', 0x0002);
		// offset: 8; size: 16
		$data .= pack('VVVV', 0x00, 0x00, 0x00, 0x00);
		// offset: 24; size: 4; section count
		$data .= pack('V', 0x0001);

		// offset: 28; size: 16; first section's class id: e0 85 9f f2 f9 4f 68 10 ab 91 08 00 2b 27 b3 d9
		$data .= pack('vvvvvvvv', 0x85E0, 0xF29F, 0x4FF9, 0x1068, 0x91AB, 0x0008, 0x272B, 0xD9B3);
		// offset: 44; size: 4; offset of the start
		$data .= pack('V', 0x30);

		// SECTION
		$dataSection = array();
		$dataSection_NumProps = 0;
		$dataSection_Summary = '';
		$dataSection_Content = '';

		// CodePage : CP-1252
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x01),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x02), // 2 byte signed integer
							   'data'	=> array('data' => 1252));
		$dataSection_NumProps++;

		//	Title
		if($this->_phpExcel->getProperties()->getTitle()){
			$dataProp = $this->_phpExcel->getProperties()->getTitle();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x02),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Subject
		if($this->_phpExcel->getProperties()->getSubject()){
			$dataProp = $this->_phpExcel->getProperties()->getSubject();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x03),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Author (Creator)
		if($this->_phpExcel->getProperties()->getCreator()){
			$dataProp = $this->_phpExcel->getProperties()->getCreator();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x04),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Keywords
		if($this->_phpExcel->getProperties()->getKeywords()){
			$dataProp = $this->_phpExcel->getProperties()->getKeywords();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x05),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Comments (Description)
		if($this->_phpExcel->getProperties()->getDescription()){
			$dataProp = $this->_phpExcel->getProperties()->getDescription();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x06),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Last Saved By (LastModifiedBy)
		if($this->_phpExcel->getProperties()->getLastModifiedBy()){
			$dataProp = $this->_phpExcel->getProperties()->getLastModifiedBy();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x08),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x1E), // null-terminated string prepended by dword string length
								   'data'	=> array('data' => $dataProp, 'length' => strlen($dataProp)));
			$dataSection_NumProps++;
		}
		//	Created Date/Time
		if($this->_phpExcel->getProperties()->getCreated()){
			$dataProp = $this->_phpExcel->getProperties()->getCreated();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x0C),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x40), // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
								   'data'	=> array('data' => PHPExcel_Shared_OLE::LocalDate2OLE($dataProp)));
			$dataSection_NumProps++;
		}
		//	Modified Date/Time
		if($this->_phpExcel->getProperties()->getModified()){
			$dataProp = $this->_phpExcel->getProperties()->getModified();
			$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x0D),
								   'offset' => array('pack' => 'V'),
								   'type' 	=> array('pack' => 'V', 'data' => 0x40), // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
								   'data'	=> array('data' => PHPExcel_Shared_OLE::LocalDate2OLE($dataProp)));
			$dataSection_NumProps++;
		}
		//	Security
		$dataSection[] = array('summary'=> array('pack' => 'V', 'data' => 0x13),
							   'offset' => array('pack' => 'V'),
							   'type' 	=> array('pack' => 'V', 'data' => 0x03), // 4 byte signed integer
							   'data'	=> array('data' => 0x00));
		$dataSection_NumProps++;


		// 		4 	Section Length
		//		4 	Property count
		//		8 * $dataSection_NumProps (8 =  ID (4) + OffSet(4))
		$dataSection_Content_Offset = 8 + $dataSection_NumProps * 8;
		foreach ($dataSection as $dataProp){
			// Summary
			$dataSection_Summary .= pack($dataProp['summary']['pack'], $dataProp['summary']['data']);
			// Offset
			$dataSection_Summary .= pack($dataProp['offset']['pack'], $dataSection_Content_Offset);
			// DataType
			$dataSection_Content .= pack($dataProp['type']['pack'], $dataProp['type']['data']);
			// Data
			if($dataProp['type']['data'] == 0x02){ // 2 byte signed integer
				$dataSection_Content .= pack('V', $dataProp['data']['data']);

				$dataSection_Content_Offset += 4 + 4;
			}
			elseif($dataProp['type']['data'] == 0x03){ // 4 byte signed integer
				$dataSection_Content .= pack('V', $dataProp['data']['data']);

				$dataSection_Content_Offset += 4 + 4;
			}
			elseif($dataProp['type']['data'] == 0x1E){ // null-terminated string prepended by dword string length
				// Null-terminated string
				$dataProp['data']['data'] .= chr(0);
				$dataProp['data']['length'] += 1;
				// Complete the string with null string for being a %4
				$dataProp['data']['length'] = $dataProp['data']['length'] + ((4 - $dataProp['data']['length'] % 4)==4 ? 0 : (4 - $dataProp['data']['length'] % 4));
				$dataProp['data']['data'] = str_pad($dataProp['data']['data'], $dataProp['data']['length'], chr(0), STR_PAD_RIGHT);

				$dataSection_Content .= pack('V', $dataProp['data']['length']);
				$dataSection_Content .= $dataProp['data']['data'];

				$dataSection_Content_Offset += 4 + 4 + strlen($dataProp['data']['data']);
			}
			elseif($dataProp['type']['data'] == 0x40){ // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
				$dataSection_Content .= $dataProp['data']['data'];

				$dataSection_Content_Offset += 4 + 8;
			}
			else {
				// Data Type Not Used at the moment
			}
		}
		// Now $dataSection_Content_Offset contains the size of the content

		// section header
		// offset: $secOffset; size: 4; section length
		// 		+ x  Size of the content (summary + content)
		$data .= pack('V', $dataSection_Content_Offset);
		// offset: $secOffset+4; size: 4; property count
		$data .= pack('V', $dataSection_NumProps);
		// Section Summary
		$data .= $dataSection_Summary;
		// Section Content
		$data .= $dataSection_Content;

		return $data;
	}
}
