<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2011 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_Reader_Excel5
 * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    ##VERSION##, ##DATE##
 */

// Original file header of ParseXL (used as the base for this class):
// --------------------------------------------------------------------------------
// Adapted from Excel_Spreadsheet_Reader developed by users bizon153,
// trex005, and mmp11 (SourceForge.net)
// http://sourceforge.net/projects/phpexcelreader/
// Primary changes made by canyoncasa (dvc) for ParseXL 1.00 ...
//	 Modelled moreso after Perl Excel Parse/Write modules
//	 Added Parse_Excel_Spreadsheet object
//		 Reads a whole worksheet or tab as row,column array or as
//		 associated hash of indexed rows and named column fields
//	 Added variables for worksheet (tab) indexes and names
//	 Added an object call for loading individual woorksheets
//	 Changed default indexing defaults to 0 based arrays
//	 Fixed date/time and percent formats
//	 Includes patches found at SourceForge...
//		 unicode patch by nobody
//		 unpack("d") machine depedency patch by matchy
//		 boundsheet utf16 patch by bjaenichen
//	 Renamed functions for shorter names
//	 General code cleanup and rigor, including <80 column width
//	 Included a testcase Excel file and PHP example calls
//	 Code works for PHP 5.x

// Primary changes made by canyoncasa (dvc) for ParseXL 1.10 ...
// http://sourceforge.net/tracker/index.php?func=detail&aid=1466964&group_id=99160&atid=623334
//	 Decoding of formula conditions, results, and tokens.
//	 Support for user-defined named cells added as an array "namedcells"
//		 Patch code for user-defined named cells supports single cells only.
//		 NOTE: this patch only works for BIFF8 as BIFF5-7 use a different
//		 external sheet reference structure


/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
	/**
	 * @ignore
	 */
	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

/**
 * PHPExcel_Reader_Excel5
 *
 * This class uses {@link http://sourceforge.net/projects/phpexcelreader/parseXL}
 *
 * @category   PHPExcel
 * @package    PHPExcel_Reader_Excel5
 * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Reader_Excel5 implements PHPExcel_Reader_IReader
{
	// ParseXL definitions
	const XLS_BIFF8						= 0x0600;
	const XLS_BIFF7						= 0x0500;
	const XLS_WorkbookGlobals			= 0x0005;
	const XLS_Worksheet					= 0x0010;

	// record identifiers
	const XLS_Type_FORMULA				= 0x0006;
	const XLS_Type_EOF					= 0x000a;
	const XLS_Type_PROTECT				= 0x0012;
	const XLS_Type_OBJECTPROTECT		= 0x0063;
	const XLS_Type_SCENPROTECT			= 0x00dd;
	const XLS_Type_PASSWORD				= 0x0013;
	const XLS_Type_HEADER				= 0x0014;
	const XLS_Type_FOOTER				= 0x0015;
	const XLS_Type_EXTERNSHEET			= 0x0017;
	const XLS_Type_DEFINEDNAME			= 0x0018;
	const XLS_Type_VERTICALPAGEBREAKS	= 0x001a;
	const XLS_Type_HORIZONTALPAGEBREAKS	= 0x001b;
	const XLS_Type_NOTE					= 0x001c;
	const XLS_Type_SELECTION			= 0x001d;
	const XLS_Type_DATEMODE				= 0x0022;
	const XLS_Type_EXTERNNAME			= 0x0023;
	const XLS_Type_LEFTMARGIN			= 0x0026;
	const XLS_Type_RIGHTMARGIN			= 0x0027;
	const XLS_Type_TOPMARGIN			= 0x0028;
	const XLS_Type_BOTTOMMARGIN			= 0x0029;
	const XLS_Type_PRINTGRIDLINES		= 0x002b;
	const XLS_Type_FILEPASS				= 0x002f;
	const XLS_Type_FONT					= 0x0031;
	const XLS_Type_CONTINUE				= 0x003c;
	const XLS_Type_PANE					= 0x0041;
	const XLS_Type_CODEPAGE				= 0x0042;
	const XLS_Type_DEFCOLWIDTH 			= 0x0055;
	const XLS_Type_OBJ					= 0x005d;
	const XLS_Type_COLINFO				= 0x007d;
	const XLS_Type_IMDATA				= 0x007f;
	const XLS_Type_SHEETPR				= 0x0081;
	const XLS_Type_HCENTER				= 0x0083;
	const XLS_Type_VCENTER				= 0x0084;
	const XLS_Type_SHEET				= 0x0085;
	const XLS_Type_PALETTE				= 0x0092;
	const XLS_Type_SCL					= 0x00a0;
	const XLS_Type_PAGESETUP			= 0x00a1;
	const XLS_Type_MULRK				= 0x00bd;
	const XLS_Type_MULBLANK				= 0x00be;
	const XLS_Type_DBCELL				= 0x00d7;
	const XLS_Type_XF					= 0x00e0;
	const XLS_Type_MERGEDCELLS			= 0x00e5;
	const XLS_Type_MSODRAWINGGROUP		= 0x00eb;
	const XLS_Type_MSODRAWING			= 0x00ec;
	const XLS_Type_SST					= 0x00fc;
	const XLS_Type_LABELSST				= 0x00fd;
	const XLS_Type_EXTSST				= 0x00ff;
	const XLS_Type_EXTERNALBOOK			= 0x01ae;
	const XLS_Type_DATAVALIDATIONS		= 0x01b2;
	const XLS_Type_TXO					= 0x01b6;
	const XLS_Type_HYPERLINK			= 0x01b8;
	const XLS_Type_DATAVALIDATION		= 0x01be;
	const XLS_Type_DIMENSION			= 0x0200;
	const XLS_Type_BLANK				= 0x0201;
	const XLS_Type_NUMBER				= 0x0203;
	const XLS_Type_LABEL				= 0x0204;
	const XLS_Type_BOOLERR				= 0x0205;
	const XLS_Type_STRING				= 0x0207;
	const XLS_Type_ROW					= 0x0208;
	const XLS_Type_INDEX				= 0x020b;
	const XLS_Type_ARRAY				= 0x0221;
	const XLS_Type_DEFAULTROWHEIGHT 	= 0x0225;
	const XLS_Type_WINDOW2				= 0x023e;
	const XLS_Type_RK					= 0x027e;
	const XLS_Type_STYLE				= 0x0293;
	const XLS_Type_FORMAT				= 0x041e;
	const XLS_Type_SHAREDFMLA			= 0x04bc;
	const XLS_Type_BOF					= 0x0809;
	const XLS_Type_SHEETPROTECTION		= 0x0867;
	const XLS_Type_RANGEPROTECTION		= 0x0868;
	const XLS_Type_SHEETLAYOUT			= 0x0862;
	const XLS_Type_XFEXT				= 0x087d;
	const XLS_Type_UNKNOWN				= 0xffff;

	/**
	 * Read data only?
	 *
	 * @var boolean
	 */
	private $_readDataOnly = false;

	/**
	 * Restict which sheets should be loaded?
	 *
	 * @var array
	 */
	private $_loadSheetsOnly = null;

	/**
	 * PHPExcel_Reader_IReadFilter instance
	 *
	 * @var PHPExcel_Reader_IReadFilter
	 */
	private $_readFilter = null;

	/**
	 * Summary Information stream data.
	 *
	 * @var string
	 */
	private $_summaryInformation;

	/**
	 * Extended Summary Information stream data.
	 *
	 * @var string
	 */
	private $_documentSummaryInformation;

	/**
	 * User-Defined Properties stream data.
	 *
	 * @var string
	 */
	private $_userDefinedProperties;

	/**
	 * Workbook stream data. (Includes workbook globals substream as well as sheet substreams)
	 *
	 * @var string
	 */
	private $_data;

	/**
	 * Size in bytes of $this->_data
	 *
	 * @var int
	 */
	private $_dataSize;

	/**
	 * Current position in stream
	 *
	 * @var integer
	 */
	private $_pos;

	/**
	 * Workbook to be returned by the reader.
	 *
	 * @var PHPExcel
	 */
	private $_phpExcel;

	/**
	 * Worksheet that is currently being built by the reader.
	 *
	 * @var PHPExcel_Worksheet
	 */
	private $_phpSheet;

	/**
	 * BIFF version
	 *
	 * @var int
	 */
	private $_version;

	/**
	 * Codepage set in the Excel file being read. Only important for BIFF5 (Excel 5.0 - Excel 95)
	 * For BIFF8 (Excel 97 - Excel 2003) this will always have the value 'UTF-16LE'
	 *
	 * @var string
	 */
	private $_codepage;

	/**
	 * Shared formats
	 *
	 * @var array
	 */
	private $_formats;

	/**
	 * Shared fonts
	 *
	 * @var array
	 */
	private $_objFonts;

	/**
	 * Color palette
	 *
	 * @var array
	 */
	private $_palette;

	/**
	 * Worksheets
	 *
	 * @var array
	 */
	private $_sheets;

	/**
	 * External books
	 *
	 * @var array
	 */
	private $_externalBooks;

	/**
	 * REF structures. Only applies to BIFF8.
	 *
	 * @var array
	 */
	private $_ref;

	/**
	 * External names
	 *
	 * @var array
	 */
	private $_externalNames;

	/**
	 * Defined names
	 *
	 * @var array
	 */
	private $_definedname;

	/**
	 * Shared strings. Only applies to BIFF8.
	 *
	 * @var array
	 */
	private $_sst;

	/**
	 * Panes are frozen? (in sheet currently being read). See WINDOW2 record.
	 *
	 * @var boolean
	 */
	private $_frozen;

	/**
	 * Fit printout to number of pages? (in sheet currently being read). See SHEETPR record.
	 *
	 * @var boolean
	 */
	private $_isFitToPages;

	/**
	 * Objects. One OBJ record contributes with one entry.
	 *
	 * @var array
	 */
	private $_objs;

	/**
	 * The combined MSODRAWINGGROUP data
	 *
	 * @var string
	 */
	private $_drawingGroupData;

	/**
	 * The combined MSODRAWING data (per sheet)
	 *
	 * @var string
	 */
	private $_drawingData;

	/**
	 * Keep track of XF index
	 *
	 * @var int
	 */
	private $_xfIndex;

	/**
	 * Mapping of XF index (that is a cell XF) to final index in cellXf collection
	 *
	 * @var array
	 */
	private $_mapCellXfIndex;

	/**
	 * Mapping of XF index (that is a style XF) to final index in cellStyleXf collection
	 *
	 * @var array
	 */
	private $_mapCellStyleXfIndex;

	/**
	 * The shared formulas in a sheet. One SHAREDFMLA record contributes with one value.
	 *
	 * @var array
	 */
	private $_sharedFormulas;

	/**
	 * The shared formula parts in a sheet. One FORMULA record contributes with one value if it
	 * refers to a shared formula.
	 *
	 * @var array
	 */
	private $_sharedFormulaParts;

	/**
	 * Read data only?
	 *
	 * @return boolean
	 */
	public function getReadDataOnly()
	{
		return $this->_readDataOnly;
	}

	/**
	 * Set read data only
	 *
	 * @param boolean $pValue
	 * @return PHPExcel_Reader_Excel5
	 */
	public function setReadDataOnly($pValue = false)
	{
		$this->_readDataOnly = $pValue;
		return $this;
	}

	/**
	 * Get which sheets to load
	 *
	 * @return mixed
	 */
	public function getLoadSheetsOnly()
	{
		return $this->_loadSheetsOnly;
	}

	/**
	 * Set which sheets to load
	 *
	 * @param mixed $value
	 * @return PHPExcel_Reader_Excel5
	 */
	public function setLoadSheetsOnly($value = null)
	{
		$this->_loadSheetsOnly = is_array($value) ?
			$value : array($value);
		return $this;
	}

	/**
	 * Set all sheets to load
	 *
	 * @return PHPExcel_Reader_Excel5
	 */
	public function setLoadAllSheets()
	{
		$this->_loadSheetsOnly = null;
		return $this;
	}

	/**
	 * Read filter
	 *
	 * @return PHPExcel_Reader_IReadFilter
	 */
	public function getReadFilter() {
		return $this->_readFilter;
	}

	/**
	 * Set read filter
	 *
	 * @param PHPExcel_Reader_IReadFilter $pValue
	 * @return PHPExcel_Reader_Excel5
	 */
	public function setReadFilter(PHPExcel_Reader_IReadFilter $pValue) {
		$this->_readFilter = $pValue;
		return $this;
	}

	/**
	 * Create a new PHPExcel_Reader_Excel5 instance
	 */
	public function __construct() {
		$this->_readFilter = new PHPExcel_Reader_DefaultReadFilter();
	}

	/**
	 * Can the current PHPExcel_Reader_IReader read the file?
	 *
	 * @param 	string 		$pFileName
	 * @return 	boolean
	 */
	public function canRead($pFilename)
	{
		// Check if file exists
		if (!file_exists($pFilename)) {
			throw new Exception("Could not open " . $pFilename . " for reading! File does not exist.");
		}

		try {
			// Use ParseXL for the hard work.
			$ole = new PHPExcel_Shared_OLERead();

			// get excel data
			$res = $ole->read($pFilename);
			return true;

		} catch (Exception $e) {
			return false;
		}
	}

	/**
	 * Reads names of the worksheets from a file, without parsing the whole file to a PHPExcel object
	 *
	 * @param 	string 		$pFilename
	 * @throws 	Exception
	 */
	public function listWorksheetNames($pFilename)
	{
		// Check if file exists
		if (!file_exists($pFilename)) {
			throw new Exception("Could not open " . $pFilename . " for reading! File does not exist.");
		}

		$worksheetNames = array();

		// Read the OLE file
		$this->_loadOLE($pFilename);

		// total byte size of Excel data (workbook global substream + sheet substreams)
		$this->_dataSize = strlen($this->_data);

		$this->_pos		= 0;
		$this->_sheets	= array();

		// Parse Workbook Global Substream
		while ($this->_pos < $this->_dataSize) {
			$code = self::_GetInt2d($this->_data, $this->_pos);

			switch ($code) {
				case self::XLS_Type_BOF:	$this->_readBof();		break;
				case self::XLS_Type_SHEET:	$this->_readSheet();	break;
				case self::XLS_Type_EOF:	$this->_readDefault();	break 2;
				default:					$this->_readDefault();	break;
			}
		}

		foreach ($this->_sheets as $sheet) {
			if ($sheet['sheetType'] != 0x00) {
				// 0x00: Worksheet, 0x02: Chart, 0x06: Visual Basic module
				continue;
			}

			$worksheetNames[] = $sheet['name'];
		}

		return $worksheetNames;
	}


	/**
	 * Loads PHPExcel from file
	 *
	 * @param 	string 		$pFilename
	 * @return 	PHPExcel
	 * @throws 	Exception
	 */
	public function load($pFilename)
	{
		// Read the OLE file
		$this->_loadOLE($pFilename);

		// Initialisations
		$this->_phpExcel = new PHPExcel;
		$this->_phpExcel->removeSheetByIndex(0); // remove 1st sheet
		if (!$this->_readDataOnly) {
			$this->_phpExcel->removeCellStyleXfByIndex(0); // remove the default style
			$this->_phpExcel->removeCellXfByIndex(0); // remove the default style
		}

		// Read the summary information stream (containing meta data)
		$this->_readSummaryInformation();

		// Read the Additional document summary information stream (containing application-specific meta data)
		$this->_readDocumentSummaryInformation();

		// total byte size of Excel data (workbook global substream + sheet substreams)
		$this->_dataSize = strlen($this->_data);

		// initialize
		$this->_pos					= 0;
		$this->_codepage			= 'CP1252';
		$this->_formats				= array();
		$this->_objFonts			= array();
		$this->_palette				= array();
		$this->_sheets				= array();
		$this->_externalBooks		= array();
		$this->_ref					= array();
		$this->_definedname			= array();
		$this->_sst					= array();
		$this->_drawingGroupData	= '';
		$this->_xfIndex				= '';
		$this->_mapCellXfIndex		= array();
		$this->_mapCellStyleXfIndex	= array();

		// Parse Workbook Global Substream
		while ($this->_pos < $this->_dataSize) {
			$code = self::_GetInt2d($this->_data, $this->_pos);

			switch ($code) {
				case self::XLS_Type_BOF:			$this->_readBof();				break;
				case self::XLS_Type_FILEPASS:		$this->_readFilepass();			break;
				case self::XLS_Type_CODEPAGE:		$this->_readCodepage();			break;
				case self::XLS_Type_DATEMODE:		$this->_readDateMode();			break;
				case self::XLS_Type_FONT:			$this->_readFont();				break;
				case self::XLS_Type_FORMAT:			$this->_readFormat();			break;
				case self::XLS_Type_XF:				$this->_readXf();				break;
				case self::XLS_Type_XFEXT:			$this->_readXfExt();			break;
				case self::XLS_Type_STYLE:			$this->_readStyle();			break;
				case self::XLS_Type_PALETTE:		$this->_readPalette();			break;
				case self::XLS_Type_SHEET:			$this->_readSheet();			break;
				case self::XLS_Type_EXTERNALBOOK:	$this->_readExternalBook();		break;
				case self::XLS_Type_EXTERNNAME:		$this->_readExternName();		break;
				case self::XLS_Type_EXTERNSHEET:	$this->_readExternSheet();		break;
				case self::XLS_Type_DEFINEDNAME:	$this->_readDefinedName();		break;
				case self::XLS_Type_MSODRAWINGGROUP:	$this->_readMsoDrawingGroup();	break;
				case self::XLS_Type_SST:			$this->_readSst();				break;
				case self::XLS_Type_EOF:			$this->_readDefault();			break 2;
				default:							$this->_readDefault();			break;
			}
		}

		// Resolve indexed colors for font, fill, and border colors
		// Cannot be resolved already in XF record, because PALETTE record comes afterwards
		if (!$this->_readDataOnly) {
			foreach ($this->_objFonts as $objFont) {
				if (isset($objFont->colorIndex)) {
					$color = self::_readColor($objFont->colorIndex,$this->_palette,$this->_version);
					$objFont->getColor()->setRGB($color['rgb']);
				}
			}

			foreach ($this->_phpExcel->getCellXfCollection() as $objStyle) {
				// fill start and end color
				$fill = $objStyle->getFill();

				if (isset($fill->startcolorIndex)) {
					$startColor = self::_readColor($fill->startcolorIndex,$this->_palette,$this->_version);
					$fill->getStartColor()->setRGB($startColor['rgb']);
				}

				if (isset($fill->endcolorIndex)) {
					$endColor = self::_readColor($fill->endcolorIndex,$this->_palette,$this->_version);
					$fill->getEndColor()->setRGB($endColor['rgb']);
				}

				// border colors
				$top      = $objStyle->getBorders()->getTop();
				$right    = $objStyle->getBorders()->getRight();
				$bottom   = $objStyle->getBorders()->getBottom();
				$left     = $objStyle->getBorders()->getLeft();
				$diagonal = $objStyle->getBorders()->getDiagonal();

				if (isset($top->colorIndex)) {
					$borderTopColor = self::_readColor($top->colorIndex,$this->_palette,$this->_version);
					$top->getColor()->setRGB($borderTopColor['rgb']);
				}

				if (isset($right->colorIndex)) {
					$borderRightColor = self::_readColor($right->colorIndex,$this->_palette,$this->_version);
					$right->getColor()->setRGB($borderRightColor['rgb']);
				}

				if (isset($bottom->colorIndex)) {
					$borderBottomColor = self::_readColor($bottom->colorIndex,$this->_palette,$this->_version);
					$bottom->getColor()->setRGB($borderBottomColor['rgb']);
				}

				if (isset($left->colorIndex)) {
					$borderLeftColor = self::_readColor($left->colorIndex,$this->_palette,$this->_version);
					$left->getColor()->setRGB($borderLeftColor['rgb']);
				}

				if (isset($diagonal->colorIndex)) {
					$borderDiagonalColor = self::_readColor($diagonal->colorIndex,$this->_palette,$this->_version);
					$diagonal->getColor()->setRGB($borderDiagonalColor['rgb']);
				}
			}
		}

		// treat MSODRAWINGGROUP records, workbook-level Escher
		if (!$this->_readDataOnly && $this->_drawingGroupData) {
			$escherWorkbook = new PHPExcel_Shared_Escher();
			$reader = new PHPExcel_Reader_Excel5_Escher($escherWorkbook);
			$escherWorkbook = $reader->load($this->_drawingGroupData);

			// debug Escher stream
			//$debug = new Debug_Escher(new PHPExcel_Shared_Escher());
			//$debug->load($this->_drawingGroupData);
		}

		// Parse the individual sheets
		foreach ($this->_sheets as $sheet) {

			if ($sheet['sheetType'] != 0x00) {
				// 0x00: Worksheet, 0x02: Chart, 0x06: Visual Basic module
				continue;
			}

			// check if sheet should be skipped
			if (isset($this->_loadSheetsOnly) && !in_array($sheet['name'], $this->_loadSheetsOnly)) {
				continue;
			}

			// add sheet to PHPExcel object
			$this->_phpSheet = $this->_phpExcel->createSheet();
			$this->_phpSheet->setTitle($sheet['name']);
			$this->_phpSheet->setSheetState($sheet['sheetState']);

			$this->_pos = $sheet['offset'];

			// Initialize isFitToPages. May change after reading SHEETPR record.
			$this->_isFitToPages = false;

			// Initialize drawingData
			$this->_drawingData = '';

			// Initialize objs
			$this->_objs = array();

			// Initialize shared formula parts
			$this->_sharedFormulaParts = array();

			// Initialize shared formulas
			$this->_sharedFormulas = array();

			while ($this->_pos <= $this->_dataSize - 4) {
				$code = self::_GetInt2d($this->_data, $this->_pos);

				switch ($code) {
					case self::XLS_Type_BOF:					$this->_readBof();						break;
					case self::XLS_Type_PRINTGRIDLINES:			$this->_readPrintGridlines();			break;
					case self::XLS_Type_DEFAULTROWHEIGHT:		$this->_readDefaultRowHeight();			break;
					case self::XLS_Type_SHEETPR:				$this->_readSheetPr();					break;
					case self::XLS_Type_HORIZONTALPAGEBREAKS:	$this->_readHorizontalPageBreaks();		break;
					case self::XLS_Type_VERTICALPAGEBREAKS:		$this->_readVerticalPageBreaks();		break;
					case self::XLS_Type_HEADER:					$this->_readHeader();					break;
					case self::XLS_Type_FOOTER:					$this->_readFooter();					break;
					case self::XLS_Type_HCENTER:				$this->_readHcenter();					break;
					case self::XLS_Type_VCENTER:				$this->_readVcenter();					break;
					case self::XLS_Type_LEFTMARGIN:				$this->_readLeftMargin();				break;
					case self::XLS_Type_RIGHTMARGIN:			$this->_readRightMargin();				break;
					case self::XLS_Type_TOPMARGIN:				$this->_readTopMargin();				break;
					case self::XLS_Type_BOTTOMMARGIN:			$this->_readBottomMargin();				break;
					case self::XLS_Type_PAGESETUP:				$this->_readPageSetup();				break;
					case self::XLS_Type_PROTECT:				$this->_readProtect();					break;
					case self::XLS_Type_SCENPROTECT:			$this->_readScenProtect();				break;
					case self::XLS_Type_OBJECTPROTECT:			$this->_readObjectProtect();			break;
					case self::XLS_Type_PASSWORD:				$this->_readPassword();					break;
					case self::XLS_Type_DEFCOLWIDTH:			$this->_readDefColWidth();				break;
					case self::XLS_Type_COLINFO:				$this->_readColInfo();					break;
					case self::XLS_Type_DIMENSION:				$this->_readDefault();					break;
					case self::XLS_Type_ROW:					$this->_readRow();						break;
					case self::XLS_Type_DBCELL:					$this->_readDefault();					break;
					case self::XLS_Type_RK:						$this->_readRk();						break;
					case self::XLS_Type_LABELSST:				$this->_readLabelSst();					break;
					case self::XLS_Type_MULRK:					$this->_readMulRk();					break;
					case self::XLS_Type_NUMBER:					$this->_readNumber();					break;
					case self::XLS_Type_FORMULA:				$this->_readFormula();					break;
					case self::XLS_Type_SHAREDFMLA:				$this->_readSharedFmla();				break;
					case self::XLS_Type_BOOLERR:				$this->_readBoolErr();					break;
					case self::XLS_Type_MULBLANK:				$this->_readMulBlank();					break;
					case self::XLS_Type_LABEL:					$this->_readLabel();					break;
					case self::XLS_Type_BLANK:					$this->_readBlank();					break;
					case self::XLS_Type_MSODRAWING:				$this->_readMsoDrawing();				break;
					case self::XLS_Type_OBJ:					$this->_readObj();						break;
					case self::XLS_Type_WINDOW2:				$this->_readWindow2();					break;
					case self::XLS_Type_SCL:					$this->_readScl();						break;
					case self::XLS_Type_PANE:					$this->_readPane();						break;
					case self::XLS_Type_SELECTION:				$this->_readSelection();				break;
					case self::XLS_Type_MERGEDCELLS:			$this->_readMergedCells();				break;
					case self::XLS_Type_HYPERLINK:				$this->_readHyperLink();				break;
					case self::XLS_Type_DATAVALIDATIONS:		$this->_readDataValidations();			break;
					case self::XLS_Type_DATAVALIDATION:			$this->_readDataValidation();			break;
					case self::XLS_Type_SHEETLAYOUT:			$this->_readSheetLayout();				break;
					case self::XLS_Type_SHEETPROTECTION:		$this->_readSheetProtection();			break;
					case self::XLS_Type_RANGEPROTECTION:		$this->_readRangeProtection();			break;
					case self::XLS_Type_NOTE:					$this->_readNote();						break;
					//case self::XLS_Type_IMDATA:				$this->_readImData();					break;
					case self::XLS_Type_CONTINUE:				$this->_readContinue();					break;
					case self::XLS_Type_EOF:					$this->_readDefault();					break 2;
					default:									$this->_readDefault();					break;
				}

			}

			// treat MSODRAWING records, sheet-level Escher
			if (!$this->_readDataOnly && $this->_drawingData) {
				$escherWorksheet = new PHPExcel_Shared_Escher();
				$reader = new PHPExcel_Reader_Excel5_Escher($escherWorksheet);
				$escherWorksheet = $reader->load($this->_drawingData);

				// debug Escher stream
				//$debug = new Debug_Escher(new PHPExcel_Shared_Escher());
				//$debug->load($this->_drawingData);

				// get all spContainers in one long array, so they can be mapped to OBJ records
				$allSpContainers = $escherWorksheet->getDgContainer()->getSpgrContainer()->getAllSpContainers();
			}

			// treat OBJ records
			foreach ($this->_objs as $n => $obj) {
//				echo 'Object ID is ',$n,'<br />';
//
				// the first shape container never has a corresponding OBJ record, hence $n + 1
				$spContainer = $allSpContainers[$n + 1];

				// we skip all spContainers that are a part of a group shape since we cannot yet handle those
				if ($spContainer->getNestingLevel() > 1) {
					continue;
				}

				// calculate the width and height of the shape
				list($startColumn, $startRow) = PHPExcel_Cell::coordinateFromString($spContainer->getStartCoordinates());
				list($endColumn, $endRow) = PHPExcel_Cell::coordinateFromString($spContainer->getEndCoordinates());

				$startOffsetX = $spContainer->getStartOffsetX();
				$startOffsetY = $spContainer->getStartOffsetY();
				$endOffsetX = $spContainer->getEndOffsetX();
				$endOffsetY = $spContainer->getEndOffsetY();

				$width = PHPExcel_Shared_Excel5::getDistanceX($this->_phpSheet, $startColumn, $startOffsetX, $endColumn, $endOffsetX);
				$height = PHPExcel_Shared_Excel5::getDistanceY($this->_phpSheet, $startRow, $startOffsetY, $endRow, $endOffsetY);

				// calculate offsetX and offsetY of the shape
				$offsetX = $startOffsetX * PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, $startColumn) / 1024;
				$offsetY = $startOffsetY * PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $startRow) / 256;

				switch ($obj['type']) {

				case 0x19:
					// Note
//					echo 'Comment Object<br />';
					break;

				case 0x08:
					// picture

					// get index to BSE entry (1-based)
					$BSEindex = $spContainer->getOPT(0x0104);
					$BSECollection = $escherWorkbook->getDggContainer()->getBstoreContainer()->getBSECollection();
					$BSE = $BSECollection[$BSEindex - 1];
					$blipType = $BSE->getBlipType();

					// need check because some blip types are not supported by Escher reader such as EMF
					if ($blip = $BSE->getBlip()) {
						$ih = imagecreatefromstring($blip->getData());
						$drawing = new PHPExcel_Worksheet_MemoryDrawing();
						$drawing->setImageResource($ih);

						// width, height, offsetX, offsetY
						$drawing->setResizeProportional(false);
						$drawing->setWidth($width);
						$drawing->setHeight($height);
						$drawing->setOffsetX($offsetX);
						$drawing->setOffsetY($offsetY);

						switch ($blipType) {
							case PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_JPEG:
								$drawing->setRenderingFunction(PHPExcel_Worksheet_MemoryDrawing::RENDERING_JPEG);
								$drawing->setMimeType(PHPExcel_Worksheet_MemoryDrawing::MIMETYPE_JPEG);
								break;

							case PHPExcel_Shared_Escher_DggContainer_BstoreContainer_BSE::BLIPTYPE_PNG:
								$drawing->setRenderingFunction(PHPExcel_Worksheet_MemoryDrawing::RENDERING_PNG);
								$drawing->setMimeType(PHPExcel_Worksheet_MemoryDrawing::MIMETYPE_PNG);
								break;
						}

						$drawing->setWorksheet($this->_phpSheet);
						$drawing->setCoordinates($spContainer->getStartCoordinates());
					}

					break;

				default:
					// other object type
					break;

				}
			}

			// treat SHAREDFMLA records
			if ($this->_version == self::XLS_BIFF8) {
				foreach ($this->_sharedFormulaParts as $cell => $baseCell) {
					list($column, $row) = PHPExcel_Cell::coordinateFromString($cell);
					if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($column, $row, $this->_phpSheet->getTitle()) ) {
						$formula = $this->_getFormulaFromStructure($this->_sharedFormulas[$baseCell], $cell);
						$this->_phpSheet->getCell($cell)->setValueExplicit('=' . $formula, PHPExcel_Cell_DataType::TYPE_FORMULA);
					}
				}
			}
		}

		// add the named ranges (defined names)
		foreach ($this->_definedname as $definedName) {
			if ($definedName['isBuiltInName']) {
				switch ($definedName['name']) {

				case pack('C', 0x06):
					// print area
					//	in general, formula looks like this: Foo!$C$7:$J$66,Bar!$A$1:$IV$2

					$ranges = explode(',', $definedName['formula']); // FIXME: what if sheetname contains comma?

					$extractedRanges = array();
					foreach ($ranges as $range) {
						// $range should look like one of these
						//		Foo!$C$7:$J$66
						//		Bar!$A$1:$IV$2

						$explodes = explode('!', $range);	// FIXME: what if sheetname contains exclamation mark?
						$sheetName = $explodes[0];

						if (count($explodes) == 2) {
							$extractedRanges[] = str_replace('$', '', $explodes[1]); // C7:J66
						}
					}
					if ($docSheet = $this->_phpExcel->getSheetByName($sheetName)) {
						$docSheet->getPageSetup()->setPrintArea(implode(',', $extractedRanges)); // C7:J66,A1:IV2
					}
					break;

				case pack('C', 0x07):
					// print titles (repeating rows)
					// Assuming BIFF8, there are 3 cases
					// 1. repeating rows
					//		formula looks like this: Sheet!$A$1:$IV$2
					//		rows 1-2 repeat
					// 2. repeating columns
					//		formula looks like this: Sheet!$A$1:$B$65536
					//		columns A-B repeat
					// 3. both repeating rows and repeating columns
					//		formula looks like this: Sheet!$A$1:$B$65536,Sheet!$A$1:$IV$2

					$ranges = explode(',', $definedName['formula']); // FIXME: what if sheetname contains comma?

					foreach ($ranges as $range) {
						// $range should look like this one of these
						//		Sheet!$A$1:$B$65536
						//		Sheet!$A$1:$IV$2

						$explodes = explode('!', $range);

						if (count($explodes) == 2) {
							if ($docSheet = $this->_phpExcel->getSheetByName($explodes[0])) {

								$extractedRange = $explodes[1];
								$extractedRange = str_replace('$', '', $extractedRange);

								$coordinateStrings = explode(':', $extractedRange);
								if (count($coordinateStrings) == 2) {
									list($firstColumn, $firstRow) = PHPExcel_Cell::coordinateFromString($coordinateStrings[0]);
									list($lastColumn, $lastRow) = PHPExcel_Cell::coordinateFromString($coordinateStrings[1]);

									if ($firstColumn == 'A' and $lastColumn == 'IV') {
										// then we have repeating rows
										$docSheet->getPageSetup()->setRowsToRepeatAtTop(array($firstRow, $lastRow));
									} elseif ($firstRow == 1 and $lastRow == 65536) {
										// then we have repeating columns
										$docSheet->getPageSetup()->setColumnsToRepeatAtLeft(array($firstColumn, $lastColumn));
									}
								}
							}
						}
					}
					break;

				}
			} else {
				// Extract range
				$explodes = explode('!', $definedName['formula']);

				if (count($explodes) == 2) {
					if ($docSheet = $this->_phpExcel->getSheetByName($explodes[0])) {
						$extractedRange = $explodes[1];
						$extractedRange = str_replace('$', '', $extractedRange);

						$localOnly = ($definedName['scope'] == 0) ? false : true;
						$scope = ($definedName['scope'] == 0) ?
							null : $this->_phpExcel->getSheetByName($this->_sheets[$definedName['scope'] - 1]['name']);

						$this->_phpExcel->addNamedRange( new PHPExcel_NamedRange((string)$definedName['name'], $docSheet, $extractedRange, $localOnly, $scope) );
					}
				}
			}
		}

		return $this->_phpExcel;
	}

	/**
	 * Use OLE reader to extract the relevant data streams from the OLE file
	 *
	 * @param string $pFilename
	 */
	private function _loadOLE($pFilename)
	{
		// OLE reader
		$ole = new PHPExcel_Shared_OLERead();

		// get excel data,
		$res = $ole->read($pFilename);
		// Get workbook data: workbook stream + sheet streams
		$this->_data = $ole->getStream($ole->wrkbook);

		// Get summary information data
		$this->_summaryInformation = $ole->getStream($ole->summaryInformation);

		// Get additional document summary information data
		$this->_documentSummaryInformation = $ole->getStream($ole->documentSummaryInformation);

		// Get user-defined property data
//		$this->_userDefinedProperties = $ole->getUserDefinedProperties();
	}

	/**
	 * Read summary information
	 */
	private function _readSummaryInformation()
	{
		if (!isset($this->_summaryInformation)) {
			return;
		}

		// offset: 0; size: 2; must be 0xFE 0xFF (UTF-16 LE byte order mark)
		// offset: 2; size: 2;
		// offset: 4; size: 2; OS version
		// offset: 6; size: 2; OS indicator
		// offset: 8; size: 16
		// offset: 24; size: 4; section count
		$secCount = self::_GetInt4d($this->_summaryInformation, 24);

		// 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
		// offset: 44; size: 4
		$secOffset = self::_GetInt4d($this->_summaryInformation, 44);

		// section header
		// offset: $secOffset; size: 4; section length
		$secLength = self::_GetInt4d($this->_summaryInformation, $secOffset);

		// offset: $secOffset+4; size: 4; property count
		$countProperties = self::_GetInt4d($this->_summaryInformation, $secOffset+4);

		// initialize code page (used to resolve string values)
		$codePage = 'CP1252';

		// offset: ($secOffset+8); size: var
		// loop through property decarations and properties
		for ($i = 0; $i < $countProperties; ++$i) {

			// offset: ($secOffset+8) + (8 * $i); size: 4; property ID
			$id = self::_GetInt4d($this->_summaryInformation, ($secOffset+8) + (8 * $i));

			// Use value of property id as appropriate
			// offset: ($secOffset+12) + (8 * $i); size: 4; offset from beginning of section (48)
			$offset = self::_GetInt4d($this->_summaryInformation, ($secOffset+12) + (8 * $i));

			$type = self::_GetInt4d($this->_summaryInformation, $secOffset + $offset);

			// initialize property value
			$value = null;

			// extract property value based on property type
			switch ($type) {
				case 0x02: // 2 byte signed integer
					$value = self::_GetInt2d($this->_summaryInformation, $secOffset + 4 + $offset);
					break;

				case 0x03: // 4 byte signed integer
					$value = self::_GetInt4d($this->_summaryInformation, $secOffset + 4 + $offset);
					break;

				case 0x13: // 4 byte unsigned integer
					// not needed yet, fix later if necessary
					break;

				case 0x1E: // null-terminated string prepended by dword string length
					$byteLength = self::_GetInt4d($this->_summaryInformation, $secOffset + 4 + $offset);
					$value = substr($this->_summaryInformation, $secOffset + 8 + $offset, $byteLength);
					$value = PHPExcel_Shared_String::ConvertEncoding($value, 'UTF-8', $codePage);
					$value = rtrim($value);
					break;

				case 0x40: // Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
					// PHP-time
					$value = PHPExcel_Shared_OLE::OLE2LocalDate(substr($this->_summaryInformation, $secOffset + 4 + $offset, 8));
					break;

				case 0x47: // Clipboard format
					// not needed yet, fix later if necessary
					break;
			}

			switch ($id) {
				case 0x01:	//	Code Page
					$codePage = PHPExcel_Shared_CodePage::NumberToName($value);
					break;

				case 0x02:	//	Title
					$this->_phpExcel->getProperties()->setTitle($value);
					break;

				case 0x03:	//	Subject
					$this->_phpExcel->getProperties()->setSubject($value);
					break;

				case 0x04:	//	Author (Creator)
					$this->_phpExcel->getProperties()->setCreator($value);
					break;

				case 0x05:	//	Keywords
					$this->_phpExcel->getProperties()->setKeywords($value);
					break;

				case 0x06:	//	Comments (Description)
					$this->_phpExcel->getProperties()->setDescription($value);
					break;

				case 0x07:	//	Template
					//	Not supported by PHPExcel
					break;

				case 0x08:	//	Last Saved By (LastModifiedBy)
					$this->_phpExcel->getProperties()->setLastModifiedBy($value);
					break;

				case 0x09:	//	Revision
					//	Not supported by PHPExcel
					break;

				case 0x0A:	//	Total Editing Time
					//	Not supported by PHPExcel
					break;

				case 0x0B:	//	Last Printed
					//	Not supported by PHPExcel
					break;

				case 0x0C:	//	Created Date/Time
					$this->_phpExcel->getProperties()->setCreated($value);
					break;

				case 0x0D:	//	Modified Date/Time
					$this->_phpExcel->getProperties()->setModified($value);
					break;

				case 0x0E:	//	Number of Pages
					//	Not supported by PHPExcel
					break;

				case 0x0F:	//	Number of Words
					//	Not supported by PHPExcel
					break;

				case 0x10:	//	Number of Characters
					//	Not supported by PHPExcel
					break;

				case 0x11:	//	Thumbnail
					//	Not supported by PHPExcel
					break;

				case 0x12:	//	Name of creating application
					//	Not supported by PHPExcel
					break;

				case 0x13:	//	Security
					//	Not supported by PHPExcel
					break;

			}
		}
	}

	/**
	 * Read additional document summary information
	 */
	private function _readDocumentSummaryInformation()
	{
		if (!isset($this->_documentSummaryInformation)) {
			return;
		}

//		hexDump($this->_documentSummaryInformation);
//
		//	offset: 0;	size: 2;	must be 0xFE 0xFF (UTF-16 LE byte order mark)
		//	offset: 2;	size: 2;
		//	offset: 4;	size: 2;	OS version
		//	offset: 6;	size: 2;	OS indicator
		//	offset: 8;	size: 16
		//	offset: 24;	size: 4;	section count
		$secCount = self::_GetInt4d($this->_documentSummaryInformation, 24);
//		echo '$secCount = ',$secCount,'<br />';

		// 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
		// offset: 44;	size: 4;	first section offset
		$secOffset = self::_GetInt4d($this->_documentSummaryInformation, 44);
//		echo '$secOffset = ',$secOffset,'<br />';

		//	section header
		//	offset: $secOffset;	size: 4;	section length
		$secLength = self::_GetInt4d($this->_documentSummaryInformation, $secOffset);
//		echo '$secLength = ',$secLength,'<br />';

		//	offset: $secOffset+4;	size: 4;	property count
		$countProperties = self::_GetInt4d($this->_documentSummaryInformation, $secOffset+4);
//		echo '$countProperties = ',$countProperties,'<br />';

		// initialize code page (used to resolve string values)
		$codePage = 'CP1252';

		//	offset: ($secOffset+8);	size: var
		//	loop through property decarations and properties
		for ($i = 0; $i < $countProperties; ++$i) {
//			echo 'Property ',$i,'<br />';
			//	offset: ($secOffset+8) + (8 * $i);	size: 4;	property ID
			$id = self::_GetInt4d($this->_documentSummaryInformation, ($secOffset+8) + (8 * $i));
//			echo 'ID is ',$id,'<br />';

			// Use value of property id as appropriate
			// offset: 60 + 8 * $i;	size: 4;	offset from beginning of section (48)
			$offset = self::_GetInt4d($this->_documentSummaryInformation, ($secOffset+12) + (8 * $i));

			$type = self::_GetInt4d($this->_documentSummaryInformation, $secOffset + $offset);
//			echo 'Type is ',$type,', ';

			// initialize property value
			$value = null;

			// extract property value based on property type
			switch ($type) {
				case 0x02:	//	2 byte signed integer
					$value = self::_GetInt2d($this->_documentSummaryInformation, $secOffset + 4 + $offset);
					break;

				case 0x03:	//	4 byte signed integer
					$value = self::_GetInt4d($this->_documentSummaryInformation, $secOffset + 4 + $offset);
					break;

				case 0x13:	//	4 byte unsigned integer
					// not needed yet, fix later if necessary
					break;

				case 0x1E:	//	null-terminated string prepended by dword string length
					$byteLength = self::_GetInt4d($this->_documentSummaryInformation, $secOffset + 4 + $offset);
					$value = substr($this->_documentSummaryInformation, $secOffset + 8 + $offset, $byteLength);
					$value = PHPExcel_Shared_String::ConvertEncoding($value, 'UTF-8', $codePage);
					$value = rtrim($value);
					break;

				case 0x40:	//	Filetime (64-bit value representing the number of 100-nanosecond intervals since January 1, 1601)
					// PHP-Time
					$value = PHPExcel_Shared_OLE::OLE2LocalDate(substr($this->_documentSummaryInformation, $secOffset + 4 + $offset, 8));
					break;

				case 0x47:	//	Clipboard format
					// not needed yet, fix later if necessary
					break;
			}

			switch ($id) {
				case 0x01:	//	Code Page
					$codePage = PHPExcel_Shared_CodePage::NumberToName($value);
					break;

				case 0x02:	//	Category
					$this->_phpExcel->getProperties()->setCategory($value);
					break;

				case 0x03:	//	Presentation Target
					//	Not supported by PHPExcel
					break;

				case 0x04:	//	Bytes
					//	Not supported by PHPExcel
					break;

				case 0x05:	//	Lines
					//	Not supported by PHPExcel
					break;

				case 0x06:	//	Paragraphs
					//	Not supported by PHPExcel
					break;

				case 0x07:	//	Slides
					//	Not supported by PHPExcel
					break;

				case 0x08:	//	Notes
					//	Not supported by PHPExcel
					break;

				case 0x09:	//	Hidden Slides
					//	Not supported by PHPExcel
					break;

				case 0x0A:	//	MM Clips
					//	Not supported by PHPExcel
					break;

				case 0x0B:	//	Scale Crop
					//	Not supported by PHPExcel
					break;

				case 0x0C:	//	Heading Pairs
					//	Not supported by PHPExcel
					break;

				case 0x0D:	//	Titles of Parts
					//	Not supported by PHPExcel
					break;

				case 0x0E:	//	Manager
					$this->_phpExcel->getProperties()->setManager($value);
					break;

				case 0x0F:	//	Company
					$this->_phpExcel->getProperties()->setCompany($value);
					break;

				case 0x10:	//	Links up-to-date
					//	Not supported by PHPExcel
					break;

			}
		}
	}

	/**
	 * Reads a general type of BIFF record. Does nothing except for moving stream pointer forward to next record.
	 */
	private function _readDefault()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
//		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;
	}

	private function _readNote()
	{
//		echo 'Read Note<br />';
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly || $this->_version != self::XLS_BIFF8) {
			return;
		}

//		hexDump($recordData);
//
		$cellAddress = $this->_readBIFF8CellAddress(substr($recordData, 0, 4));
		$noteObjID = self::_GetInt2d($recordData, 6);
		$noteAuthor = trim(substr($recordData, 8));

//		echo 'Note Address=',$cellAddress,'<br />';
//		echo 'Note Object ID=',$noteObjID,'<br />';
//		echo 'Note Author=',$noteAuthor,'<br />';
	}

	/**
	 * Read BOF
	 */
	private function _readBof()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 2; size: 2; type of the following data
		$substreamType = self::_GetInt2d($recordData, 2);

		switch ($substreamType) {
			case self::XLS_WorkbookGlobals:
				$version = self::_GetInt2d($recordData, 0);
				if (($version != self::XLS_BIFF8) && ($version != self::XLS_BIFF7)) {
					throw new Exception('Cannot read this Excel file. Version is too old.');
				}
				$this->_version = $version;
				break;

			case self::XLS_Worksheet:
				// do not use this version information for anything
				// it is unreliable (OpenOffice doc, 5.8), use only version information from the global stream
				break;

			default:
				// substream, e.g. chart
				// just skip the entire substream
				do {
					$code = self::_GetInt2d($this->_data, $this->_pos);
					$this->_readDefault();
				} while ($code != self::XLS_Type_EOF && $this->_pos < $this->_dataSize);
				break;
		}
	}

	/**
	 * FILEPASS
	 *
	 * This record is part of the File Protection Block. It
	 * contains information about the read/write password of the
	 * file. All record contents following this record will be
	 * encrypted.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readFilepass()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
//		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		throw new Exception('Cannot read encrypted file');
	}

	/**
	 * CODEPAGE
	 *
	 * This record stores the text encoding used to write byte
	 * strings, stored as MS Windows code page identifier.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readCodepage()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; code page identifier
		$codepage = self::_GetInt2d($recordData, 0);

		$this->_codepage = PHPExcel_Shared_CodePage::NumberToName($codepage);
	}

	/**
	 * DATEMODE
	 *
	 * This record specifies the base date for displaying date
	 * values. All dates are stored as count of days past this
	 * base date. In BIFF2-BIFF4 this record is part of the
	 * Calculation Settings Block. In BIFF5-BIFF8 it is
	 * stored in the Workbook Globals Substream.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readDateMode()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; 0 = base 1900, 1 = base 1904
		PHPExcel_Shared_Date::setExcelCalendar(PHPExcel_Shared_Date::CALENDAR_WINDOWS_1900);
		if (ord($recordData{0}) == 1) {
			PHPExcel_Shared_Date::setExcelCalendar(PHPExcel_Shared_Date::CALENDAR_MAC_1904);
		}
	}

	/**
	 * Read a FONT record
	 */
	private function _readFont()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			$objFont = new PHPExcel_Style_Font();

			// offset: 0; size: 2; height of the font (in twips = 1/20 of a point)
			$size = self::_GetInt2d($recordData, 0);
			$objFont->setSize($size / 20);

			// offset: 2; size: 2; option flags
				// bit: 0; mask 0x0001; bold (redundant in BIFF5-BIFF8)
				// bit: 1; mask 0x0002; italic
				$isItalic = (0x0002 & self::_GetInt2d($recordData, 2)) >> 1;
				if ($isItalic) $objFont->setItalic(true);

				// bit: 2; mask 0x0004; underlined (redundant in BIFF5-BIFF8)
				// bit: 3; mask 0x0008; strike
				$isStrike = (0x0008 & self::_GetInt2d($recordData, 2)) >> 3;
				if ($isStrike) $objFont->setStrikethrough(true);

			// offset: 4; size: 2; colour index
			$colorIndex = self::_GetInt2d($recordData, 4);
			$objFont->colorIndex = $colorIndex;

			// offset: 6; size: 2; font weight
			$weight = self::_GetInt2d($recordData, 6);
			switch ($weight) {
				case 0x02BC:
					$objFont->setBold(true);
					break;
			}

			// offset: 8; size: 2; escapement type
			$escapement = self::_GetInt2d($recordData, 8);
			switch ($escapement) {
				case 0x0001:
					$objFont->setSuperScript(true);
					break;
				case 0x0002:
					$objFont->setSubScript(true);
					break;
			}

			// offset: 10; size: 1; underline type
			$underlineType = ord($recordData{10});
			switch ($underlineType) {
				case 0x00:
					break; // no underline
				case 0x01:
					$objFont->setUnderline(PHPExcel_Style_Font::UNDERLINE_SINGLE);
					break;
				case 0x02:
					$objFont->setUnderline(PHPExcel_Style_Font::UNDERLINE_DOUBLE);
					break;
				case 0x21:
					$objFont->setUnderline(PHPExcel_Style_Font::UNDERLINE_SINGLEACCOUNTING);
					break;
				case 0x22:
					$objFont->setUnderline(PHPExcel_Style_Font::UNDERLINE_DOUBLEACCOUNTING);
					break;
			}

			// offset: 11; size: 1; font family
			// offset: 12; size: 1; character set
			// offset: 13; size: 1; not used
			// offset: 14; size: var; font name
			if ($this->_version == self::XLS_BIFF8) {
				$string = self::_readUnicodeStringShort(substr($recordData, 14));
			} else {
				$string = $this->_readByteStringShort(substr($recordData, 14));
			}
			$objFont->setName($string['value']);

			$this->_objFonts[] = $objFont;
		}
	}

	/**
	 * FORMAT
	 *
	 * This record contains information about a number format.
	 * All FORMAT records occur together in a sequential list.
	 *
	 * In BIFF2-BIFF4 other records referencing a FORMAT record
	 * contain a zero-based index into this list. From BIFF5 on
	 * the FORMAT record contains the index itself that will be
	 * used by other records.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readFormat()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			$indexCode = self::_GetInt2d($recordData, 0);

			if ($this->_version == self::XLS_BIFF8) {
				$string = self::_readUnicodeStringLong(substr($recordData, 2));
			} else {
				// BIFF7
				$string = $this->_readByteStringShort(substr($recordData, 2));
			}

			$formatString = $string['value'];
			$this->_formats[$indexCode] = $formatString;
		}
	}

	/**
	 * XF - Extended Format
	 *
	 * This record contains formatting information for cells, rows, columns or styles.
	 * According to http://support.microsoft.com/kb/147732 there are always at least 15 cell style XF
	 * and 1 cell XF.
	 * Inspection of Excel files generated by MS Office Excel shows that XF records 0-14 are cell style XF
	 * and XF record 15 is a cell XF
	 * We only read the first cell style XF and skip the remaining cell style XF records
	 * We read all cell XF records.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readXf()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		$objStyle = new PHPExcel_Style();

		if (!$this->_readDataOnly) {
			// offset:  0; size: 2; Index to FONT record
			if (self::_GetInt2d($recordData, 0) < 4) {
				$fontIndex = self::_GetInt2d($recordData, 0);
			} else {
				// this has to do with that index 4 is omitted in all BIFF versions for some strange reason
				// check the OpenOffice documentation of the FONT record
				$fontIndex = self::_GetInt2d($recordData, 0) - 1;
			}
			$objStyle->setFont($this->_objFonts[$fontIndex]);

			// offset:  2; size: 2; Index to FORMAT record
			$numberFormatIndex = self::_GetInt2d($recordData, 2);
			if (isset($this->_formats[$numberFormatIndex])) {
				// then we have user-defined format code
				$numberformat = array('code' => $this->_formats[$numberFormatIndex]);
			} elseif (($code = PHPExcel_Style_NumberFormat::builtInFormatCode($numberFormatIndex)) !== '') {
				// then we have built-in format code
				$numberformat = array('code' => $code);
			} else {
				// we set the general format code
				$numberformat = array('code' => 'General');
			}
			$objStyle->getNumberFormat()->setFormatCode($numberformat['code']);

			// offset:  4; size: 2; XF type, cell protection, and parent style XF
			// bit 2-0; mask 0x0007; XF_TYPE_PROT
			$xfTypeProt = self::_GetInt2d($recordData, 4);
			// bit 0; mask 0x01; 1 = cell is locked
			$isLocked = (0x01 & $xfTypeProt) >> 0;
			$objStyle->getProtection()->setLocked($isLocked ?
				PHPExcel_Style_Protection::PROTECTION_INHERIT : PHPExcel_Style_Protection::PROTECTION_UNPROTECTED);

			// bit 1; mask 0x02; 1 = Formula is hidden
			$isHidden = (0x02 & $xfTypeProt) >> 1;
			$objStyle->getProtection()->setHidden($isHidden ?
				PHPExcel_Style_Protection::PROTECTION_PROTECTED : PHPExcel_Style_Protection::PROTECTION_UNPROTECTED);

			// bit 2; mask 0x04; 0 = Cell XF, 1 = Cell Style XF
			$isCellStyleXf = (0x04 & $xfTypeProt) >> 2;

			// offset:  6; size: 1; Alignment and text break
			// bit 2-0, mask 0x07; horizontal alignment
			$horAlign = (0x07 & ord($recordData{6})) >> 0;
			switch ($horAlign) {
				case 0:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_GENERAL);
					break;
				case 1:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_LEFT);
					break;
				case 2:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
					break;
				case 3:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_RIGHT);
					break;
				case 5:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_JUSTIFY);
					break;
				case 6:
					$objStyle->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER_CONTINUOUS);
					break;
			}
			// bit 3, mask 0x08; wrap text
			$wrapText = (0x08 & ord($recordData{6})) >> 3;
			switch ($wrapText) {
				case 0:
					$objStyle->getAlignment()->setWrapText(false);
					break;
				case 1:
					$objStyle->getAlignment()->setWrapText(true);
					break;
			}
			// bit 6-4, mask 0x70; vertical alignment
			$vertAlign = (0x70 & ord($recordData{6})) >> 4;
			switch ($vertAlign) {
				case 0:
					$objStyle->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_TOP);
					break;
				case 1:
					$objStyle->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER);
					break;
				case 2:
					$objStyle->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_BOTTOM);
					break;
				case 3:
					$objStyle->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_JUSTIFY);
					break;
			}

			if ($this->_version == self::XLS_BIFF8) {
				// offset:  7; size: 1; XF_ROTATION: Text rotation angle
					$angle = ord($recordData{7});
					$rotation = 0;
					if ($angle <= 90) {
						$rotation = $angle;
					} else if ($angle <= 180) {
						$rotation = 90 - $angle;
					} else if ($angle == 255) {
						$rotation = -165;
					}
					$objStyle->getAlignment()->setTextRotation($rotation);

				// offset:  8; size: 1; Indentation, shrink to cell size, and text direction
					// bit: 3-0; mask: 0x0F; indent level
					$indent = (0x0F & ord($recordData{8})) >> 0;
					$objStyle->getAlignment()->setIndent($indent);

					// bit: 4; mask: 0x10; 1 = shrink content to fit into cell
					$shrinkToFit = (0x10 & ord($recordData{8})) >> 4;
					switch ($shrinkToFit) {
						case 0:
							$objStyle->getAlignment()->setShrinkToFit(false);
							break;
						case 1:
							$objStyle->getAlignment()->setShrinkToFit(true);
							break;
					}

				// offset:  9; size: 1; Flags used for attribute groups

				// offset: 10; size: 4; Cell border lines and background area
					// bit: 3-0; mask: 0x0000000F; left style
					if ($bordersLeftStyle = self::_mapBorderStyle((0x0000000F & self::_GetInt4d($recordData, 10)) >> 0)) {
						$objStyle->getBorders()->getLeft()->setBorderStyle($bordersLeftStyle);
					}
					// bit: 7-4; mask: 0x000000F0; right style
					if ($bordersRightStyle = self::_mapBorderStyle((0x000000F0 & self::_GetInt4d($recordData, 10)) >> 4)) {
						$objStyle->getBorders()->getRight()->setBorderStyle($bordersRightStyle);
					}
					// bit: 11-8; mask: 0x00000F00; top style
					if ($bordersTopStyle = self::_mapBorderStyle((0x00000F00 & self::_GetInt4d($recordData, 10)) >> 8)) {
						$objStyle->getBorders()->getTop()->setBorderStyle($bordersTopStyle);
					}
					// bit: 15-12; mask: 0x0000F000; bottom style
					if ($bordersBottomStyle = self::_mapBorderStyle((0x0000F000 & self::_GetInt4d($recordData, 10)) >> 12)) {
						$objStyle->getBorders()->getBottom()->setBorderStyle($bordersBottomStyle);
					}
					// bit: 22-16; mask: 0x007F0000; left color
					$objStyle->getBorders()->getLeft()->colorIndex = (0x007F0000 & self::_GetInt4d($recordData, 10)) >> 16;

					// bit: 29-23; mask: 0x3F800000; right color
					$objStyle->getBorders()->getRight()->colorIndex = (0x3F800000 & self::_GetInt4d($recordData, 10)) >> 23;

					// bit: 30; mask: 0x40000000; 1 = diagonal line from top left to right bottom
					$diagonalDown = (0x40000000 & self::_GetInt4d($recordData, 10)) >> 30 ?
						true : false;

					// bit: 31; mask: 0x80000000; 1 = diagonal line from bottom left to top right
					$diagonalUp = (0x80000000 & self::_GetInt4d($recordData, 10)) >> 31 ?
						true : false;

					if ($diagonalUp == false && $diagonalDown == false) {
						$objStyle->getBorders()->setDiagonalDirection(PHPExcel_Style_Borders::DIAGONAL_NONE);
					} elseif ($diagonalUp == true && $diagonalDown == false) {
						$objStyle->getBorders()->setDiagonalDirection(PHPExcel_Style_Borders::DIAGONAL_UP);
					} elseif ($diagonalUp == false && $diagonalDown == true) {
						$objStyle->getBorders()->setDiagonalDirection(PHPExcel_Style_Borders::DIAGONAL_DOWN);
					} elseif ($diagonalUp == true && $diagonalDown == true) {
						$objStyle->getBorders()->setDiagonalDirection(PHPExcel_Style_Borders::DIAGONAL_BOTH);
					}

				// offset: 14; size: 4;
					// bit: 6-0; mask: 0x0000007F; top color
					$objStyle->getBorders()->getTop()->colorIndex = (0x0000007F & self::_GetInt4d($recordData, 14)) >> 0;

					// bit: 13-7; mask: 0x00003F80; bottom color
					$objStyle->getBorders()->getBottom()->colorIndex = (0x00003F80 & self::_GetInt4d($recordData, 14)) >> 7;

					// bit: 20-14; mask: 0x001FC000; diagonal color
					$objStyle->getBorders()->getDiagonal()->colorIndex = (0x001FC000 & self::_GetInt4d($recordData, 14)) >> 14;

					// bit: 24-21; mask: 0x01E00000; diagonal style
					if ($bordersDiagonalStyle = self::_mapBorderStyle((0x01E00000 & self::_GetInt4d($recordData, 14)) >> 21)) {
						$objStyle->getBorders()->getDiagonal()->setBorderStyle($bordersDiagonalStyle);
					}

					// bit: 31-26; mask: 0xFC000000 fill pattern
					if ($fillType = self::_mapFillPattern((0xFC000000 & self::_GetInt4d($recordData, 14)) >> 26)) {
						$objStyle->getFill()->setFillType($fillType);
					}
				// offset: 18; size: 2; pattern and background colour
					// bit: 6-0; mask: 0x007F; color index for pattern color
					$objStyle->getFill()->startcolorIndex = (0x007F & self::_GetInt2d($recordData, 18)) >> 0;

					// bit: 13-7; mask: 0x3F80; color index for pattern background
					$objStyle->getFill()->endcolorIndex = (0x3F80 & self::_GetInt2d($recordData, 18)) >> 7;
			} else {
				// BIFF5

				// offset: 7; size: 1; Text orientation and flags
				$orientationAndFlags = ord($recordData{7});

				// bit: 1-0; mask: 0x03; XF_ORIENTATION: Text orientation
				$xfOrientation = (0x03 & $orientationAndFlags) >> 0;
				switch ($xfOrientation) {
					case 0:
						$objStyle->getAlignment()->setTextRotation(0);
						break;
					case 1:
						$objStyle->getAlignment()->setTextRotation(-165);
						break;
					case 2:
						$objStyle->getAlignment()->setTextRotation(90);
						break;
					case 3:
						$objStyle->getAlignment()->setTextRotation(-90);
						break;
				}

				// offset: 8; size: 4; cell border lines and background area
				$borderAndBackground = self::_GetInt4d($recordData, 8);

				// bit: 6-0; mask: 0x0000007F; color index for pattern color
				$objStyle->getFill()->startcolorIndex = (0x0000007F & $borderAndBackground) >> 0;

				// bit: 13-7; mask: 0x00003F80; color index for pattern background
				$objStyle->getFill()->endcolorIndex = (0x00003F80 & $borderAndBackground) >> 7;

				// bit: 21-16; mask: 0x003F0000; fill pattern
				$objStyle->getFill()->setFillType(self::_mapFillPattern((0x003F0000 & $borderAndBackground) >> 16));

				// bit: 24-22; mask: 0x01C00000; bottom line style
				$objStyle->getBorders()->getBottom()->setBorderStyle(self::_mapBorderStyle((0x01C00000 & $borderAndBackground) >> 22));

				// bit: 31-25; mask: 0xFE000000; bottom line color
				$objStyle->getBorders()->getBottom()->colorIndex = (0xFE000000 & $borderAndBackground) >> 25;

				// offset: 12; size: 4; cell border lines
				$borderLines = self::_GetInt4d($recordData, 12);

				// bit: 2-0; mask: 0x00000007; top line style
				$objStyle->getBorders()->getTop()->setBorderStyle(self::_mapBorderStyle((0x00000007 & $borderLines) >> 0));

				// bit: 5-3; mask: 0x00000038; left line style
				$objStyle->getBorders()->getLeft()->setBorderStyle(self::_mapBorderStyle((0x00000038 & $borderLines) >> 3));

				// bit: 8-6; mask: 0x000001C0; right line style
				$objStyle->getBorders()->getRight()->setBorderStyle(self::_mapBorderStyle((0x000001C0 & $borderLines) >> 6));

				// bit: 15-9; mask: 0x0000FE00; top line color index
				$objStyle->getBorders()->getTop()->colorIndex = (0x0000FE00 & $borderLines) >> 9;

				// bit: 22-16; mask: 0x007F0000; left line color index
				$objStyle->getBorders()->getLeft()->colorIndex = (0x007F0000 & $borderLines) >> 16;

				// bit: 29-23; mask: 0x3F800000; right line color index
				$objStyle->getBorders()->getRight()->colorIndex = (0x3F800000 & $borderLines) >> 23;
			}

			// add cellStyleXf or cellXf and update mapping
			if ($isCellStyleXf) {
				// we only read one style XF record which is always the first
				if ($this->_xfIndex == 0) {
					$this->_phpExcel->addCellStyleXf($objStyle);
					$this->_mapCellStyleXfIndex[$this->_xfIndex] = 0;
				}
			} else {
				// we read all cell XF records
				$this->_phpExcel->addCellXf($objStyle);
				$this->_mapCellXfIndex[$this->_xfIndex] = count($this->_phpExcel->getCellXfCollection()) - 1;
			}

			// update XF index for when we read next record
			++$this->_xfIndex;
		}
	}

	/**
	 *
	 */
	private function _readXfExt()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; 0x087D = repeated header

			// offset: 2; size: 2

			// offset: 4; size: 8; not used

			// offset: 12; size: 2; record version

			// offset: 14; size: 2; index to XF record which this record modifies
			$ixfe = self::_GetInt2d($recordData, 14);

			// offset: 16; size: 2; not used

			// offset: 18; size: 2; number of extension properties that follow
			$cexts = self::_GetInt2d($recordData, 18);

			// start reading the actual extension data
			$offset = 20;
			while ($offset < $length) {
				// extension type
				$extType = self::_GetInt2d($recordData, $offset);

				// extension length
				$cb = self::_GetInt2d($recordData, $offset + 2);

				// extension data
				$extData = substr($recordData, $offset + 4, $cb);

				switch ($extType) {
					case 4:		// fill start color
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$fill = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getFill();
								$fill->getStartColor()->setRGB($rgb);
								unset($fill->startcolorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 5:		// fill end color
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$fill = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getFill();
								$fill->getEndColor()->setRGB($rgb);
								unset($fill->endcolorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 7:		// border color top
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$top = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getBorders()->getTop();
								$top->getColor()->setRGB($rgb);
								unset($top->colorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 8:		// border color bottom
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$bottom = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getBorders()->getBottom();
								$bottom->getColor()->setRGB($rgb);
								unset($bottom->colorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 9:		// border color left
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$left = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getBorders()->getLeft();
								$left->getColor()->setRGB($rgb);
								unset($left->colorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 10:		// border color right
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$right = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getBorders()->getRight();
								$right->getColor()->setRGB($rgb);
								unset($right->colorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 11:		// border color diagonal
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$diagonal = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getBorders()->getDiagonal();
								$diagonal->getColor()->setRGB($rgb);
								unset($diagonal->colorIndex); // normal color index does not apply, discard
							}
						}
						break;

					case 13:	// font color
						$xclfType  = self::_GetInt2d($extData, 0); // color type
						$xclrValue = substr($extData, 4, 4); // color value (value based on color type)

						if ($xclfType == 2) {
							$rgb = sprintf('%02X%02X%02X', ord($xclrValue{0}), ord($xclrValue{1}), ord($xclrValue{2}));

							// modify the relevant style property
							if ( isset($this->_mapCellXfIndex[$ixfe]) ) {
								$font = $this->_phpExcel->getCellXfByIndex($this->_mapCellXfIndex[$ixfe])->getFont();
								$font->getColor()->setRGB($rgb);
								unset($font->colorIndex); // normal color index does not apply, discard
							}
						}
						break;
				}

				$offset += $cb;
			}
		}

	}

	/**
	 * Read STYLE record
	 */
	private function _readStyle()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; index to XF record and flag for built-in style
			$ixfe = self::_GetInt2d($recordData, 0);

			// bit: 11-0; mask 0x0FFF; index to XF record
			$xfIndex = (0x0FFF & $ixfe) >> 0;

			// bit: 15; mask 0x8000; 0 = user-defined style, 1 = built-in style
			$isBuiltIn = (bool) ((0x8000 & $ixfe) >> 15);

			if ($isBuiltIn) {
				// offset: 2; size: 1; identifier for built-in style
				$builtInId = ord($recordData{2});

				switch ($builtInId) {
				case 0x00:
					// currently, we are not using this for anything
					break;

				default:
					break;
				}

			} else {
				// user-defined; not supported by PHPExcel
			}
		}
	}

	/**
	 * Read PALETTE record
	 */
	private function _readPalette()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; number of following colors
			$nm = self::_GetInt2d($recordData, 0);

			// list of RGB colors
			for ($i = 0; $i < $nm; ++$i) {
				$rgb = substr($recordData, 2 + 4 * $i, 4);
				$this->_palette[] = self::_readRGB($rgb);
			}
		}
	}

	/**
	 * SHEET
	 *
	 * This record is  located in the  Workbook Globals
	 * Substream  and represents a sheet inside the workbook.
	 * One SHEET record is written for each sheet. It stores the
	 * sheet name and a stream offset to the BOF record of the
	 * respective Sheet Substream within the Workbook Stream.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readSheet()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 4; absolute stream position of the BOF record of the sheet
		$rec_offset = self::_GetInt4d($recordData, 0);

		// offset: 4; size: 1; sheet state
		switch (ord($recordData{4})) {
			case 0x00: $sheetState = PHPExcel_Worksheet::SHEETSTATE_VISIBLE;    break;
			case 0x01: $sheetState = PHPExcel_Worksheet::SHEETSTATE_HIDDEN;     break;
			case 0x02: $sheetState = PHPExcel_Worksheet::SHEETSTATE_VERYHIDDEN; break;
			default: $sheetState = PHPExcel_Worksheet::SHEETSTATE_VISIBLE;      break;
		}

		// offset: 5; size: 1; sheet type
		$sheetType = ord($recordData{5});

		// offset: 6; size: var; sheet name
		if ($this->_version == self::XLS_BIFF8) {
			$string = self::_readUnicodeStringShort(substr($recordData, 6));
			$rec_name = $string['value'];
		} elseif ($this->_version == self::XLS_BIFF7) {
			$string = $this->_readByteStringShort(substr($recordData, 6));
			$rec_name = $string['value'];
		}

		$this->_sheets[] = array(
			'name' => $rec_name,
			'offset' => $rec_offset,
			'sheetState' => $sheetState,
			'sheetType' => $sheetType,
		);
	}

	/**
	 * Read EXTERNALBOOK record
	 */
	private function _readExternalBook()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset within record data
		$offset = 0;

		// there are 4 types of records
		if (strlen($recordData) > 4) {
			// external reference
			// offset: 0; size: 2; number of sheet names ($nm)
			$nm = self::_GetInt2d($recordData, 0);
			$offset += 2;

			// offset: 2; size: var; encoded URL without sheet name (Unicode string, 16-bit length)
			$encodedUrlString = self::_readUnicodeStringLong(substr($recordData, 2));
			$offset += $encodedUrlString['size'];

			// offset: var; size: var; list of $nm sheet names (Unicode strings, 16-bit length)
			$externalSheetNames = array();
			for ($i = 0; $i < $nm; ++$i) {
				$externalSheetNameString = self::_readUnicodeStringLong(substr($recordData, $offset));
				$externalSheetNames[] = $externalSheetNameString['value'];
				$offset += $externalSheetNameString['size'];
			}

			// store the record data
			$this->_externalBooks[] = array(
				'type' => 'external',
				'encodedUrl' => $encodedUrlString['value'],
				'externalSheetNames' => $externalSheetNames,
			);

		} elseif (substr($recordData, 2, 2) == pack('CC', 0x01, 0x04)) {
			// internal reference
			// offset: 0; size: 2; number of sheet in this document
			// offset: 2; size: 2; 0x01 0x04
			$this->_externalBooks[] = array(
				'type' => 'internal',
			);
		} elseif (substr($recordData, 0, 4) == pack('vCC', 0x0001, 0x01, 0x3A)) {
			// add-in function
			// offset: 0; size: 2; 0x0001
			$this->_externalBooks[] = array(
				'type' => 'addInFunction',
			);
		} elseif (substr($recordData, 0, 2) == pack('v', 0x0000)) {
			// DDE links, OLE links
			// offset: 0; size: 2; 0x0000
			// offset: 2; size: var; encoded source document name
			$this->_externalBooks[] = array(
				'type' => 'DDEorOLE',
			);
		}
	}

	/**
	 * Read EXTERNNAME record.
	 */
	private function _readExternName()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// external sheet references provided for named cells
		if ($this->_version == self::XLS_BIFF8) {
			// offset: 0; size: 2; options
			$options = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 2;

			// offset: 4; size: 2; not used

			// offset: 6; size: var
			$nameString = self::_readUnicodeStringShort(substr($recordData, 6));

			// offset: var; size: var; formula data
			$offset = 6 + $nameString['size'];
			$formula = $this->_getFormulaFromStructure(substr($recordData, $offset));

			$this->_externalNames[] = array(
				'name' => $nameString['value'],
				'formula' => $formula,
			);
		}
	}

	/**
	 * Read EXTERNSHEET record
	 */
	private function _readExternSheet()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// external sheet references provided for named cells
		if ($this->_version == self::XLS_BIFF8) {
			// offset: 0; size: 2; number of following ref structures
			$nm = self::_GetInt2d($recordData, 0);
			for ($i = 0; $i < $nm; ++$i) {
				$this->_ref[] = array(
					// offset: 2 + 6 * $i; index to EXTERNALBOOK record
					'externalBookIndex' => self::_GetInt2d($recordData, 2 + 6 * $i),
					// offset: 4 + 6 * $i; index to first sheet in EXTERNALBOOK record
					'firstSheetIndex' => self::_GetInt2d($recordData, 4 + 6 * $i),
					// offset: 6 + 6 * $i; index to last sheet in EXTERNALBOOK record
					'lastSheetIndex' => self::_GetInt2d($recordData, 6 + 6 * $i),
				);
			}
		}
	}

	/**
	 * DEFINEDNAME
	 *
	 * This record is part of a Link Table. It contains the name
	 * and the token array of an internal defined name. Token
	 * arrays of defined names contain tokens with aberrant
	 * token classes.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readDefinedName()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8) {
			// retrieves named cells

			// offset: 0; size: 2; option flags
			$opts = self::_GetInt2d($recordData, 0);

				// bit: 5; mask: 0x0020; 0 = user-defined name, 1 = built-in-name
				$isBuiltInName = (0x0020 & $opts) >> 5;

			// offset: 2; size: 1; keyboard shortcut

			// offset: 3; size: 1; length of the name (character count)
			$nlen = ord($recordData{3});

			// offset: 4; size: 2; size of the formula data (it can happen that this is zero)
			// note: there can also be additional data, this is not included in $flen
			$flen = self::_GetInt2d($recordData, 4);

			// offset: 8; size: 2; 0=Global name, otherwise index to sheet (1-based)
			$scope = self::_GetInt2d($recordData, 8);

			// offset: 14; size: var; Name (Unicode string without length field)
			$string = self::_readUnicodeString(substr($recordData, 14), $nlen);

			// offset: var; size: $flen; formula data
			$offset = 14 + $string['size'];
			$formulaStructure = pack('v', $flen) . substr($recordData, $offset);

			try {
				$formula = $this->_getFormulaFromStructure($formulaStructure);
			} catch (Exception $e) {
				$formula = '';
			}

			$this->_definedname[] = array(
				'isBuiltInName' => $isBuiltInName,
				'name' => $string['value'],
				'formula' => $formula,
				'scope' => $scope,
			);
		}
	}

	/**
	 * Read MSODRAWINGGROUP record
	 */
	private function _readMsoDrawingGroup()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);

		// get spliced record data
		$splicedRecordData = $this->_getSplicedRecordData();
		$recordData = $splicedRecordData['recordData'];

		$this->_drawingGroupData .= $recordData;
	}

	/**
	 * SST - Shared String Table
	 *
	 * This record contains a list of all strings used anywhere
	 * in the workbook. Each string occurs only once. The
	 * workbook uses indexes into the list to reference the
	 * strings.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 **/
	private function _readSst()
	{
		// offset within (spliced) record data
		$pos = 0;

		// get spliced record data
		$splicedRecordData = $this->_getSplicedRecordData();

		$recordData = $splicedRecordData['recordData'];
		$spliceOffsets = $splicedRecordData['spliceOffsets'];

		// offset: 0; size: 4; total number of strings in the workbook
		$pos += 4;

		// offset: 4; size: 4; number of following strings ($nm)
		$nm = self::_GetInt4d($recordData, 4);
		$pos += 4;

		// loop through the Unicode strings (16-bit length)
		for ($i = 0; $i < $nm; ++$i) {

			// number of characters in the Unicode string
			$numChars = self::_GetInt2d($recordData, $pos);
			$pos += 2;

			// option flags
			$optionFlags = ord($recordData{$pos});
			++$pos;

			// bit: 0; mask: 0x01; 0 = compressed; 1 = uncompressed
			$isCompressed = (($optionFlags & 0x01) == 0) ;

			// bit: 2; mask: 0x02; 0 = ordinary; 1 = Asian phonetic
			$hasAsian = (($optionFlags & 0x04) != 0);

			// bit: 3; mask: 0x03; 0 = ordinary; 1 = Rich-Text
			$hasRichText = (($optionFlags & 0x08) != 0);

			if ($hasRichText) {
				// number of Rich-Text formatting runs
				$formattingRuns = self::_GetInt2d($recordData, $pos);
				$pos += 2;
			}

			if ($hasAsian) {
				// size of Asian phonetic setting
				$extendedRunLength = self::_GetInt4d($recordData, $pos);
				$pos += 4;
			}

			// expected byte length of character array if not split
			$len = ($isCompressed) ? $numChars : $numChars * 2;

			// look up limit position
			foreach ($spliceOffsets as $spliceOffset) {
				// it can happen that the string is empty, therefore we need
				// <= and not just <
				if ($pos <= $spliceOffset) {
					$limitpos = $spliceOffset;
					break;
				}
			}

			if ($pos + $len <= $limitpos) {
				// character array is not split between records

				$retstr = substr($recordData, $pos, $len);
				$pos += $len;

			} else {
				// character array is split between records

				// first part of character array
				$retstr = substr($recordData, $pos, $limitpos - $pos);

				$bytesRead = $limitpos - $pos;

				// remaining characters in Unicode string
				$charsLeft = $numChars - (($isCompressed) ? $bytesRead : ($bytesRead / 2));

				$pos = $limitpos;

				// keep reading the characters
				while ($charsLeft > 0) {

					// look up next limit position, in case the string span more than one continue record
					foreach ($spliceOffsets as $spliceOffset) {
						if ($pos < $spliceOffset) {
							$limitpos = $spliceOffset;
							break;
						}
					}

					// repeated option flags
					// OpenOffice.org documentation 5.21
					$option = ord($recordData{$pos});
					++$pos;

					if ($isCompressed && ($option == 0)) {
						// 1st fragment compressed
						// this fragment compressed
						$len = min($charsLeft, $limitpos - $pos);
						$retstr .= substr($recordData, $pos, $len);
						$charsLeft -= $len;
						$isCompressed = true;

					} elseif (!$isCompressed && ($option != 0)) {
						// 1st fragment uncompressed
						// this fragment uncompressed
						$len = min($charsLeft * 2, $limitpos - $pos);
						$retstr .= substr($recordData, $pos, $len);
						$charsLeft -= $len / 2;
						$isCompressed = false;

					} elseif (!$isCompressed && ($option == 0)) {
						// 1st fragment uncompressed
						// this fragment compressed
						$len = min($charsLeft, $limitpos - $pos);
						for ($j = 0; $j < $len; ++$j) {
							$retstr .= $recordData{$pos + $j} . chr(0);
						}
						$charsLeft -= $len;
						$isCompressed = false;

					} else {
						// 1st fragment compressed
						// this fragment uncompressed
						$newstr = '';
						for ($j = 0; $j < strlen($retstr); ++$j) {
							$newstr .= $retstr[$j] . chr(0);
						}
						$retstr = $newstr;
						$len = min($charsLeft * 2, $limitpos - $pos);
						$retstr .= substr($recordData, $pos, $len);
						$charsLeft -= $len / 2;
						$isCompressed = false;
					}

					$pos += $len;
				}
			}

			// convert to UTF-8
			$retstr = self::_encodeUTF16($retstr, $isCompressed);

			// read additional Rich-Text information, if any
			$fmtRuns = array();
			if ($hasRichText) {
				// list of formatting runs
				for ($j = 0; $j < $formattingRuns; ++$j) {
					// first formatted character; zero-based
					$charPos = self::_GetInt2d($recordData, $pos + $j * 4);

					// index to font record
					$fontIndex = self::_GetInt2d($recordData, $pos + 2 + $j * 4);

					$fmtRuns[] = array(
						'charPos' => $charPos,
						'fontIndex' => $fontIndex,
					);
				}
				$pos += 4 * $formattingRuns;
			}

			// read additional Asian phonetics information, if any
			if ($hasAsian) {
				// For Asian phonetic settings, we skip the extended string data
				$pos += $extendedRunLength;
			}

			// store the shared sting
			$this->_sst[] = array(
				'value' => $retstr,
				'fmtRuns' => $fmtRuns,
			);
		}

		// _getSplicedRecordData() takes care of moving current position in data stream
	}

	/**
	 * Read PRINTGRIDLINES record
	 */
	private function _readPrintGridlines()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8 && !$this->_readDataOnly) {
			// offset: 0; size: 2; 0 = do not print sheet grid lines; 1 = print sheet gridlines
			$printGridlines = (bool) self::_GetInt2d($recordData, 0);
			$this->_phpSheet->setPrintGridlines($printGridlines);
		}
	}

	/**
	 * Read DEFAULTROWHEIGHT record
	 */
	private function _readDefaultRowHeight()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; option flags
		// offset: 2; size: 2; default height for unused rows, (twips 1/20 point)
		$height = self::_GetInt2d($recordData, 2);
		$this->_phpSheet->getDefaultRowDimension()->setRowHeight($height / 20);
	}

	/**
	 * Read SHEETPR record
	 */
	private function _readSheetPr()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2

		// bit: 6; mask: 0x0040; 0 = outline buttons above outline group
		$isSummaryBelow = (0x0040 & self::_GetInt2d($recordData, 0)) >> 6;
		$this->_phpSheet->setShowSummaryBelow($isSummaryBelow);

		// bit: 7; mask: 0x0080; 0 = outline buttons left of outline group
		$isSummaryRight = (0x0080 & self::_GetInt2d($recordData, 0)) >> 7;
		$this->_phpSheet->setShowSummaryRight($isSummaryRight);

		// bit: 8; mask: 0x100; 0 = scale printout in percent, 1 = fit printout to number of pages
		// this corresponds to radio button setting in page setup dialog in Excel
		$this->_isFitToPages = (bool) ((0x0100 & self::_GetInt2d($recordData, 0)) >> 8);
	}

	/**
	 * Read HORIZONTALPAGEBREAKS record
	 */
	private function _readHorizontalPageBreaks()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8 && !$this->_readDataOnly) {

			// offset: 0; size: 2; number of the following row index structures
			$nm = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 6 * $nm; list of $nm row index structures
			for ($i = 0; $i < $nm; ++$i) {
				$r = self::_GetInt2d($recordData, 2 + 6 * $i);
				$cf = self::_GetInt2d($recordData, 2 + 6 * $i + 2);
				$cl = self::_GetInt2d($recordData, 2 + 6 * $i + 4);

				// not sure why two column indexes are necessary?
				$this->_phpSheet->setBreakByColumnAndRow($cf, $r, PHPExcel_Worksheet::BREAK_ROW);
			}
		}
	}

	/**
	 * Read VERTICALPAGEBREAKS record
	 */
	private function _readVerticalPageBreaks()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8 && !$this->_readDataOnly) {
			// offset: 0; size: 2; number of the following column index structures
			$nm = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 6 * $nm; list of $nm row index structures
			for ($i = 0; $i < $nm; ++$i) {
				$c = self::_GetInt2d($recordData, 2 + 6 * $i);
				$rf = self::_GetInt2d($recordData, 2 + 6 * $i + 2);
				$rl = self::_GetInt2d($recordData, 2 + 6 * $i + 4);

				// not sure why two row indexes are necessary?
				$this->_phpSheet->setBreakByColumnAndRow($c, $rf, PHPExcel_Worksheet::BREAK_COLUMN);
			}
		}
	}

	/**
	 * Read HEADER record
	 */
	private function _readHeader()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: var
			// realized that $recordData can be empty even when record exists
			if ($recordData) {
				if ($this->_version == self::XLS_BIFF8) {
					$string = self::_readUnicodeStringLong($recordData);
				} else {
					$string = $this->_readByteStringShort($recordData);
				}

				$this->_phpSheet->getHeaderFooter()->setOddHeader($string['value']);
				$this->_phpSheet->getHeaderFooter()->setEvenHeader($string['value']);
			}
		}
	}

	/**
	 * Read FOOTER record
	 */
	private function _readFooter()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: var
			// realized that $recordData can be empty even when record exists
			if ($recordData) {
				if ($this->_version == self::XLS_BIFF8) {
					$string = self::_readUnicodeStringLong($recordData);
				} else {
					$string = $this->_readByteStringShort($recordData);
				}
				$this->_phpSheet->getHeaderFooter()->setOddFooter($string['value']);
				$this->_phpSheet->getHeaderFooter()->setEvenFooter($string['value']);
			}
		}
	}

	/**
	 * Read HCENTER record
	 */
	private function _readHcenter()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; 0 = print sheet left aligned, 1 = print sheet centered horizontally
			$isHorizontalCentered = (bool) self::_GetInt2d($recordData, 0);

			$this->_phpSheet->getPageSetup()->setHorizontalCentered($isHorizontalCentered);
		}
	}

	/**
	 * Read VCENTER record
	 */
	private function _readVcenter()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; 0 = print sheet aligned at top page border, 1 = print sheet vertically centered
			$isVerticalCentered = (bool) self::_GetInt2d($recordData, 0);

			$this->_phpSheet->getPageSetup()->setVerticalCentered($isVerticalCentered);
		}
	}

	/**
	 * Read LEFTMARGIN record
	 */
	private function _readLeftMargin()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 8
			$this->_phpSheet->getPageMargins()->setLeft(self::_extractNumber($recordData));
		}
	}

	/**
	 * Read RIGHTMARGIN record
	 */
	private function _readRightMargin()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 8
			$this->_phpSheet->getPageMargins()->setRight(self::_extractNumber($recordData));
		}
	}

	/**
	 * Read TOPMARGIN record
	 */
	private function _readTopMargin()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 8
			$this->_phpSheet->getPageMargins()->setTop(self::_extractNumber($recordData));
		}
	}

	/**
	 * Read BOTTOMMARGIN record
	 */
	private function _readBottomMargin()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 8
			$this->_phpSheet->getPageMargins()->setBottom(self::_extractNumber($recordData));
		}
	}

	/**
	 * Read PAGESETUP record
	 */
	private function _readPageSetup()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; paper size
			$paperSize = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 2; scaling factor
			$scale = self::_GetInt2d($recordData, 2);

			// offset: 6; size: 2; fit worksheet width to this number of pages, 0 = use as many as needed
			$fitToWidth = self::_GetInt2d($recordData, 6);

			// offset: 8; size: 2; fit worksheet height to this number of pages, 0 = use as many as needed
			$fitToHeight = self::_GetInt2d($recordData, 8);

			// offset: 10; size: 2; option flags

				// bit: 1; mask: 0x0002; 0=landscape, 1=portrait
				$isPortrait = (0x0002 & self::_GetInt2d($recordData, 10)) >> 1;

				// bit: 2; mask: 0x0004; 1= paper size, scaling factor, paper orient. not init
				// when this bit is set, do not use flags for those properties
				$isNotInit = (0x0004 & self::_GetInt2d($recordData, 10)) >> 2;

			if (!$isNotInit) {
				$this->_phpSheet->getPageSetup()->setPaperSize($paperSize);
				switch ($isPortrait) {
				case 0: $this->_phpSheet->getPageSetup()->setOrientation(PHPExcel_Worksheet_PageSetup::ORIENTATION_LANDSCAPE); break;
				case 1: $this->_phpSheet->getPageSetup()->setOrientation(PHPExcel_Worksheet_PageSetup::ORIENTATION_PORTRAIT); break;
				}

				$this->_phpSheet->getPageSetup()->setScale($scale, false);
				$this->_phpSheet->getPageSetup()->setFitToPage((bool) $this->_isFitToPages);
				$this->_phpSheet->getPageSetup()->setFitToWidth($fitToWidth, false);
				$this->_phpSheet->getPageSetup()->setFitToHeight($fitToHeight, false);
			}

			// offset: 16; size: 8; header margin (IEEE 754 floating-point value)
			$marginHeader = self::_extractNumber(substr($recordData, 16, 8));
			$this->_phpSheet->getPageMargins()->setHeader($marginHeader);

			// offset: 24; size: 8; footer margin (IEEE 754 floating-point value)
			$marginFooter = self::_extractNumber(substr($recordData, 24, 8));
			$this->_phpSheet->getPageMargins()->setFooter($marginFooter);
		}
	}

	/**
	 * PROTECT - Sheet protection (BIFF2 through BIFF8)
	 *   if this record is omitted, then it also means no sheet protection
	 */
	private function _readProtect()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly) {
			return;
		}

		// offset: 0; size: 2;

		// bit 0, mask 0x01; 1 = sheet is protected
		$bool = (0x01 & self::_GetInt2d($recordData, 0)) >> 0;
		$this->_phpSheet->getProtection()->setSheet((bool)$bool);
	}

	/**
	 * SCENPROTECT
	 */
	private function _readScenProtect()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly) {
			return;
		}

		// offset: 0; size: 2;

		// bit: 0, mask 0x01; 1 = scenarios are protected
		$bool = (0x01 & self::_GetInt2d($recordData, 0)) >> 0;

		$this->_phpSheet->getProtection()->setScenarios((bool)$bool);
	}

	/**
	 * OBJECTPROTECT
	 */
	private function _readObjectProtect()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly) {
			return;
		}

		// offset: 0; size: 2;

		// bit: 0, mask 0x01; 1 = objects are protected
		$bool = (0x01 & self::_GetInt2d($recordData, 0)) >> 0;

		$this->_phpSheet->getProtection()->setObjects((bool)$bool);
	}

	/**
	 * PASSWORD - Sheet protection (hashed) password (BIFF2 through BIFF8)
	 */
	private function _readPassword()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; 16-bit hash value of password
			$password = strtoupper(dechex(self::_GetInt2d($recordData, 0))); // the hashed password
			$this->_phpSheet->getProtection()->setPassword($password, true);
		}
	}

	/**
	 * Read DEFCOLWIDTH record
	 */
	private function _readDefColWidth()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; default column width
		$width = self::_GetInt2d($recordData, 0);
		if ($width != 8) {
			$this->_phpSheet->getDefaultColumnDimension()->setWidth($width);
		}
	}

	/**
	 * Read COLINFO record
	 */
	private function _readColInfo()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; index to first column in range
			$fc = self::_GetInt2d($recordData, 0); // first column index

			// offset: 2; size: 2; index to last column in range
			$lc = self::_GetInt2d($recordData, 2); // first column index

			// offset: 4; size: 2; width of the column in 1/256 of the width of the zero character
			$width = self::_GetInt2d($recordData, 4);

			// offset: 6; size: 2; index to XF record for default column formatting
			$xfIndex = self::_GetInt2d($recordData, 6);

			// offset: 8; size: 2; option flags

				// bit: 0; mask: 0x0001; 1= columns are hidden
				$isHidden = (0x0001 & self::_GetInt2d($recordData, 8)) >> 0;

				// bit: 10-8; mask: 0x0700; outline level of the columns (0 = no outline)
				$level = (0x0700 & self::_GetInt2d($recordData, 8)) >> 8;

				// bit: 12; mask: 0x1000; 1 = collapsed
				$isCollapsed = (0x1000 & self::_GetInt2d($recordData, 8)) >> 12;

			// offset: 10; size: 2; not used

			for ($i = $fc; $i <= $lc; ++$i) {
				if ($lc == 255 || $lc == 256) {
					$this->_phpSheet->getDefaultColumnDimension()->setWidth($width / 256);
					break;
				}
				$this->_phpSheet->getColumnDimensionByColumn($i)->setWidth($width / 256);
				$this->_phpSheet->getColumnDimensionByColumn($i)->setVisible(!$isHidden);
				$this->_phpSheet->getColumnDimensionByColumn($i)->setOutlineLevel($level);
				$this->_phpSheet->getColumnDimensionByColumn($i)->setCollapsed($isCollapsed);
				$this->_phpSheet->getColumnDimensionByColumn($i)->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}
		}
	}

	/**
	 * ROW
	 *
	 * This record contains the properties of a single row in a
	 * sheet. Rows and cells in a sheet are divided into blocks
	 * of 32 rows.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readRow()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; index of this row
			$r = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 2; index to column of the first cell which is described by a cell record

			// offset: 4; size: 2; index to column of the last cell which is described by a cell record, increased by 1

			// offset: 6; size: 2;

				// bit: 14-0; mask: 0x7FFF; height of the row, in twips = 1/20 of a point
				$height = (0x7FFF & self::_GetInt2d($recordData, 6)) >> 0;

				// bit: 15: mask: 0x8000; 0 = row has custom height; 1= row has default height
				$useDefaultHeight = (0x8000 & self::_GetInt2d($recordData, 6)) >> 15;

				if (!$useDefaultHeight) {
					$this->_phpSheet->getRowDimension($r + 1)->setRowHeight($height / 20);
				}

			// offset: 8; size: 2; not used

			// offset: 10; size: 2; not used in BIFF5-BIFF8

			// offset: 12; size: 4; option flags and default row formatting

				// bit: 2-0: mask: 0x00000007; outline level of the row
				$level = (0x00000007 & self::_GetInt4d($recordData, 12)) >> 0;
				$this->_phpSheet->getRowDimension($r + 1)->setOutlineLevel($level);

				// bit: 4; mask: 0x00000010; 1 = outline group start or ends here... and is collapsed
				$isCollapsed = (0x00000010 & self::_GetInt4d($recordData, 12)) >> 4;
				$this->_phpSheet->getRowDimension($r + 1)->setCollapsed($isCollapsed);

				// bit: 5; mask: 0x00000020; 1 = row is hidden
				$isHidden = (0x00000020 & self::_GetInt4d($recordData, 12)) >> 5;
				$this->_phpSheet->getRowDimension($r + 1)->setVisible(!$isHidden);

				// bit: 7; mask: 0x00000080; 1 = row has explicit format
				$hasExplicitFormat = (0x00000080 & self::_GetInt4d($recordData, 12)) >> 7;

				// bit: 27-16; mask: 0x0FFF0000; only applies when hasExplicitFormat = 1; index to XF record
				$xfIndex = (0x0FFF0000 & self::_GetInt4d($recordData, 12)) >> 16;

				if ($hasExplicitFormat) {
					$this->_phpSheet->getRowDimension($r + 1)->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
				}
		}
	}

	/**
	 * Read RK record
	 * This record represents a cell that contains an RK value
	 * (encoded integer or floating-point value). If a
	 * floating-point value cannot be encoded to an RK value,
	 * a NUMBER record will be written. This record replaces the
	 * record INTEGER written in BIFF2.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readRk()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; index to column
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset: 4; size: 2; index to XF record
			$xfIndex = self::_GetInt2d($recordData, 4);

			// offset: 6; size: 4; RK value
			$rknum = self::_GetInt4d($recordData, 6);
			$numValue = self::_GetIEEE754($rknum);

			$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
			if (!$this->_readDataOnly) {
				// add style information
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}

			// add cell
			$cell->setValueExplicit($numValue, PHPExcel_Cell_DataType::TYPE_NUMERIC);
		}
	}

	/**
	 * Read LABELSST record
	 * This record represents a cell that contains a string. It
	 * replaces the LABEL record and RSTRING record used in
	 * BIFF2-BIFF5.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readLabelSst()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; index to column
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset: 4; size: 2; index to XF record
			$xfIndex = self::_GetInt2d($recordData, 4);

			// offset: 6; size: 4; index to SST record
			$index = self::_GetInt4d($recordData, 6);

			// add cell
			if (($fmtRuns = $this->_sst[$index]['fmtRuns']) && !$this->_readDataOnly) {
				// then we should treat as rich text
				$richText = new PHPExcel_RichText();
				$charPos = 0;
				$sstCount = count($this->_sst[$index]['fmtRuns']);
				for ($i = 0; $i <= $sstCount; ++$i) {
					if (isset($fmtRuns[$i])) {
						$text = PHPExcel_Shared_String::Substring($this->_sst[$index]['value'], $charPos, $fmtRuns[$i]['charPos'] - $charPos);
						$charPos = $fmtRuns[$i]['charPos'];
					} else {
						$text = PHPExcel_Shared_String::Substring($this->_sst[$index]['value'], $charPos, PHPExcel_Shared_String::CountCharacters($this->_sst[$index]['value']));
					}

					if (PHPExcel_Shared_String::CountCharacters($text) > 0) {
						if ($i == 0) { // first text run, no style
							$richText->createText($text);
						} else {
							$textRun = $richText->createTextRun($text);
							if (isset($fmtRuns[$i - 1])) {
								if ($fmtRuns[$i - 1]['fontIndex'] < 4) {
									$fontIndex = $fmtRuns[$i - 1]['fontIndex'];
								} else {
									// this has to do with that index 4 is omitted in all BIFF versions for some strange reason
									// check the OpenOffice documentation of the FONT record
									$fontIndex = $fmtRuns[$i - 1]['fontIndex'] - 1;
								}
								$textRun->setFont(clone $this->_objFonts[$fontIndex]);
							}
						}
					}
				}
				$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
				$cell->setValueExplicit($richText, PHPExcel_Cell_DataType::TYPE_STRING);
			} else {
				$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
				$cell->setValueExplicit($this->_sst[$index]['value'], PHPExcel_Cell_DataType::TYPE_STRING);
			}

			if (!$this->_readDataOnly) {
				// add style information
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}
		}
	}

	/**
	 * Read MULRK record
	 * This record represents a cell range containing RK value
	 * cells. All cells are located in the same row.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readMulRk()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; index to first column
		$colFirst = self::_GetInt2d($recordData, 2);

		// offset: var; size: 2; index to last column
		$colLast = self::_GetInt2d($recordData, $length - 2);
		$columns = $colLast - $colFirst + 1;

		// offset within record data
		$offset = 4;

		for ($i = 0; $i < $columns; ++$i) {
			$columnString = PHPExcel_Cell::stringFromColumnIndex($colFirst + $i);

			// Read cell?
			if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {

				// offset: var; size: 2; index to XF record
				$xfIndex = self::_GetInt2d($recordData, $offset);

				// offset: var; size: 4; RK value
				$numValue = self::_GetIEEE754(self::_GetInt4d($recordData, $offset + 2));
				$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
				if (!$this->_readDataOnly) {
					// add style
					$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
				}

				// add cell value
				$cell->setValueExplicit($numValue, PHPExcel_Cell_DataType::TYPE_NUMERIC);
			}

			$offset += 6;
		}
	}

	/**
	 * Read NUMBER record
	 * This record represents a cell that contains a
	 * floating-point value.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readNumber()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size 2; index to column
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset 4; size: 2; index to XF record
			$xfIndex = self::_GetInt2d($recordData, 4);

			$numValue = self::_extractNumber(substr($recordData, 6, 8));

			$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
			if (!$this->_readDataOnly) {
				// add cell style
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}

			// add cell value
			$cell->setValueExplicit($numValue, PHPExcel_Cell_DataType::TYPE_NUMERIC);
		}
	}

	/**
	 * Read FORMULA record + perhaps a following STRING record if formula result is a string
	 * This record contains the token array and the result of a
	 * formula cell.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readFormula()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; row index
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; col index
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// offset: 20: size: variable; formula structure
		$formulaStructure = substr($recordData, 20);

		// offset: 14: size: 2; option flags, recalculate always, recalculate on open etc.
		$options = self::_GetInt2d($recordData, 14);

		// bit: 0; mask: 0x0001; 1 = recalculate always
		// bit: 1; mask: 0x0002; 1 = calculate on open
		// bit: 2; mask: 0x0008; 1 = part of a shared formula
		$isPartOfSharedFormula = (bool) (0x0008 & $options);

		// WARNING:
		// We can apparently not rely on $isPartOfSharedFormula. Even when $isPartOfSharedFormula = true
		// the formula data may be ordinary formula data, therefore we need to check
		// explicitly for the tExp token (0x01)
		$isPartOfSharedFormula = $isPartOfSharedFormula && ord($formulaStructure{2}) == 0x01;

		if ($isPartOfSharedFormula) {
			// part of shared formula which means there will be a formula with a tExp token and nothing else
			// get the base cell, grab tExp token
			$baseRow = self::_GetInt2d($formulaStructure, 3);
			$baseCol = self::_GetInt2d($formulaStructure, 5);
			$this->_baseCell = PHPExcel_Cell::stringFromColumnIndex($baseCol). ($baseRow + 1);
		}

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {

			if ($isPartOfSharedFormula) {
				// formula is added to this cell after the sheet has been read
				$this->_sharedFormulaParts[$columnString . ($row + 1)] = $this->_baseCell;
			}

			// offset: 16: size: 4; not used

			// offset: 4; size: 2; XF index
			$xfIndex = self::_GetInt2d($recordData, 4);

			// offset: 6; size: 8; result of the formula
			if ( (ord($recordData{6}) == 0)
				&& (ord($recordData{12}) == 255)
				&& (ord($recordData{13}) == 255) ) {

				// String formula. Result follows in appended STRING record
				$dataType = PHPExcel_Cell_DataType::TYPE_STRING;

				// read possible SHAREDFMLA record
				$code = self::_GetInt2d($this->_data, $this->_pos);
				if ($code == self::XLS_Type_SHAREDFMLA) {
					$this->_readSharedFmla();
				}

				// read STRING record
				$value = $this->_readString();

			} elseif ((ord($recordData{6}) == 1)
				&& (ord($recordData{12}) == 255)
				&& (ord($recordData{13}) == 255)) {

				// Boolean formula. Result is in +2; 0=false, 1=true
				$dataType = PHPExcel_Cell_DataType::TYPE_BOOL;
				$value = (bool) ord($recordData{8});

			} elseif ((ord($recordData{6}) == 2)
				&& (ord($recordData{12}) == 255)
				&& (ord($recordData{13}) == 255)) {

				// Error formula. Error code is in +2
				$dataType = PHPExcel_Cell_DataType::TYPE_ERROR;
				$value = self::_mapErrorCode(ord($recordData{8}));

			} elseif ((ord($recordData{6}) == 3)
				&& (ord($recordData{12}) == 255)
				&& (ord($recordData{13}) == 255)) {

				// Formula result is a null string
				$dataType = PHPExcel_Cell_DataType::TYPE_NULL;
				$value = '';

			} else {

				// forumla result is a number, first 14 bytes like _NUMBER record
				$dataType = PHPExcel_Cell_DataType::TYPE_NUMERIC;
				$value = self::_extractNumber(substr($recordData, 6, 8));

			}

			$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
			if (!$this->_readDataOnly) {
				// add cell style
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}

			// store the formula
			if (!$isPartOfSharedFormula) {
				// not part of shared formula
				// add cell value. If we can read formula, populate with formula, otherwise just used cached value
				try {
					if ($this->_version != self::XLS_BIFF8) {
						throw new Exception('Not BIFF8. Can only read BIFF8 formulas');
					}
					$formula = $this->_getFormulaFromStructure($formulaStructure); // get formula in human language
					$cell->setValueExplicit('=' . $formula, PHPExcel_Cell_DataType::TYPE_FORMULA);

				} catch (Exception $e) {
					$cell->setValueExplicit($value, $dataType);
				}
			} else {
				if ($this->_version == self::XLS_BIFF8) {
					// do nothing at this point, formula id added later in the code
				} else {
					$cell->setValueExplicit($value, $dataType);
				}
			}

			// store the cached calculated value
			$cell->setCalculatedValue($value);
		}
	}

	/**
	 * Read a SHAREDFMLA record. This function just stores the binary shared formula in the reader,
	 * which usually contains relative references.
	 * These will be used to construct the formula in each shared formula part after the sheet is read.
	 */
	private function _readSharedFmla()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0, size: 6; cell range address of the area used by the shared formula, not used for anything
		$cellRange = substr($recordData, 0, 6);
		$cellRange = $this->_readBIFF5CellRangeAddressFixed($cellRange); // note: even BIFF8 uses BIFF5 syntax

		// offset: 6, size: 1; not used

		// offset: 7, size: 1; number of existing FORMULA records for this shared formula
		$no = ord($recordData{7});

		// offset: 8, size: var; Binary token array of the shared formula
		$formula = substr($recordData, 8);

		// at this point we only store the shared formula for later use
		$this->_sharedFormulas[$this->_baseCell] = $formula;

	}

	/**
	 * Read a STRING record from current stream position and advance the stream pointer to next record
	 * This record is used for storing result from FORMULA record when it is a string, and
	 * it occurs directly after the FORMULA record
	 *
	 * @return string The string contents as UTF-8
	 */
	private function _readString()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8) {
			$string = self::_readUnicodeStringLong($recordData);
			$value = $string['value'];
		} else {
			$string = $this->_readByteStringLong($recordData);
			$value = $string['value'];
		}

		return $value;
	}

	/**
	 * Read BOOLERR record
	 * This record represents a Boolean value or error value
	 * cell.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readBoolErr()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; row index
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; column index
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset: 4; size: 2; index to XF record
			$xfIndex = self::_GetInt2d($recordData, 4);

			// offset: 6; size: 1; the boolean value or error value
			$boolErr = ord($recordData{6});

			// offset: 7; size: 1; 0=boolean; 1=error
			$isError = ord($recordData{7});

			$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
			switch ($isError) {
				case 0: // boolean
					$value = (bool) $boolErr;

					// add cell value
					$cell->setValueExplicit($value, PHPExcel_Cell_DataType::TYPE_BOOL);
					break;

				case 1: // error type
					$value = self::_mapErrorCode($boolErr);

					// add cell value
					$cell->setValueExplicit($value, PHPExcel_Cell_DataType::TYPE_ERROR);
					break;
			}

			if (!$this->_readDataOnly) {
				// add cell style
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}
		}
	}

	/**
	 * Read MULBLANK record
	 * This record represents a cell range of empty cells. All
	 * cells are located in the same row
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readMulBlank()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; index to first column
		$fc = self::_GetInt2d($recordData, 2);

		// offset: 4; size: 2 x nc; list of indexes to XF records
		// add style information
		if (!$this->_readDataOnly) {
			for ($i = 0; $i < $length / 2 - 3; ++$i) {
				$columnString = PHPExcel_Cell::stringFromColumnIndex($fc + $i);

				// Read cell?
				if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
					$xfIndex = self::_GetInt2d($recordData, 4 + 2 * $i);
					$this->_phpSheet->getCell($columnString . ($row + 1))->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
				}
			}
		}

		// offset: 6; size 2; index to last column (not needed)
	}

	/**
	 * Read LABEL record
	 * This record represents a cell that contains a string. In
	 * BIFF8 it is usually replaced by the LABELSST record.
	 * Excel still uses this record, if it copies unformatted
	 * text cells to the clipboard.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readLabel()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; index to row
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; index to column
		$column = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($column);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset: 4; size: 2; XF index
			$xfIndex = self::_GetInt2d($recordData, 4);

			// add cell value
			// todo: what if string is very long? continue record
			if ($this->_version == self::XLS_BIFF8) {
				$string = self::_readUnicodeStringLong(substr($recordData, 6));
				$value = $string['value'];
			} else {
				$string = $this->_readByteStringLong(substr($recordData, 6));
				$value = $string['value'];
			}
			$cell = $this->_phpSheet->getCell($columnString . ($row + 1));
			$cell->setValueExplicit($value, PHPExcel_Cell_DataType::TYPE_STRING);

			if (!$this->_readDataOnly) {
				// add cell style
				$cell->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}
		}
	}

	/**
	 * Read BLANK record
	 */
	private function _readBlank()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; row index
		$row = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; col index
		$col = self::_GetInt2d($recordData, 2);
		$columnString = PHPExcel_Cell::stringFromColumnIndex($col);

		// Read cell?
		if ( !is_null($this->getReadFilter()) && $this->getReadFilter()->readCell($columnString, $row + 1, $this->_phpSheet->getTitle()) ) {
			// offset: 4; size: 2; XF index
			$xfIndex = self::_GetInt2d($recordData, 4);

			// add style information
			if (!$this->_readDataOnly) {
				$this->_phpSheet->getCell($columnString . ($row + 1))->setXfIndex($this->_mapCellXfIndex[$xfIndex]);
			}
		}

	}

	/**
	 * Read MSODRAWING record
	 */
	private function _readMsoDrawing()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);

		// get spliced record data
		$splicedRecordData = $this->_getSplicedRecordData();
		$recordData = $splicedRecordData['recordData'];

		$this->_drawingData .= $recordData;
	}

	/**
	 * Read OBJ record
	 */
	private function _readObj()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly || $this->_version != self::XLS_BIFF8) {
			return;
		}

		// recordData consists of an array of subrecords looking like this:
		//	ft: 2 bytes; id number
		//	cb: 2 bytes; size in bytes of following data
		//	data: var; subrecord data

		// for now, we are just interested in the second subrecord containing the object type
		$ot = self::_GetInt2d($recordData, 4);

		$this->_objs[] = array(
			'type' => $ot,
		);
	}

	/**
	 * Read WINDOW2 record
	 */
	private function _readWindow2()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; option flags
		$options = self::_GetInt2d($recordData, 0);

		// bit: 1; mask: 0x0002; 0 = do not show gridlines, 1 = show gridlines
		$showGridlines = (bool) ((0x0002 & $options) >> 1);
		$this->_phpSheet->setShowGridlines($showGridlines);

		// bit: 2; mask: 0x0004; 0 = do not show headers, 1 = show headers
		$showRowColHeaders = (bool) ((0x0004 & $options) >> 2);
		$this->_phpSheet->setShowRowColHeaders($showRowColHeaders);

		// bit: 3; mask: 0x0008; 0 = panes are not frozen, 1 = panes are frozen
		$this->_frozen = (bool) ((0x0008 & $options) >> 3);

		// bit: 6; mask: 0x0040; 0 = columns from left to right, 1 = columns from right to left
		$this->_phpSheet->setRightToLeft((bool)((0x0040 & $options) >> 6));

		// bit: 10; mask: 0x0400; 0 = sheet not active, 1 = sheet active
		$isActive = (bool) ((0x0400 & $options) >> 10);
		if ($isActive) {
			$this->_phpExcel->setActiveSheetIndex($this->_phpExcel->getIndex($this->_phpSheet));
		}
	}

	/**
	 * Read SCL record
	 */
	private function _readScl()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// offset: 0; size: 2; numerator of the view magnification
		$numerator = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; numerator of the view magnification
		$denumerator = self::_GetInt2d($recordData, 2);

		// set the zoom scale (in percent)
		$this->_phpSheet->getSheetView()->setZoomScale($numerator * 100 / $denumerator);
	}

	/**
	 * Read PANE record
	 */
	private function _readPane()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; position of vertical split
			$px = self::_GetInt2d($recordData, 0);

			// offset: 2; size: 2; position of horizontal split
			$py = self::_GetInt2d($recordData, 2);

			if ($this->_frozen) {
				// frozen panes
				$this->_phpSheet->freezePane(PHPExcel_Cell::stringFromColumnIndex($px) . ($py + 1));
			} else {
				// unfrozen panes; split windows; not supported by PHPExcel core
			}
		}
	}

	/**
	 * Read SELECTION record. There is one such record for each pane in the sheet.
	 */
	private function _readSelection()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 1; pane identifier
			$paneId = ord($recordData{0});

			// offset: 1; size: 2; index to row of the active cell
			$r = self::_GetInt2d($recordData, 1);

			// offset: 3; size: 2; index to column of the active cell
			$c = self::_GetInt2d($recordData, 3);

			// offset: 5; size: 2; index into the following cell range list to the
			//  entry that contains the active cell
			$index = self::_GetInt2d($recordData, 5);

			// offset: 7; size: var; cell range address list containing all selected cell ranges
			$data = substr($recordData, 7);
			$cellRangeAddressList = $this->_readBIFF5CellRangeAddressList($data); // note: also BIFF8 uses BIFF5 syntax

			$selectedCells = $cellRangeAddressList['cellRangeAddresses'][0];

			// first row '1' + last row '16384' indicates that full column is selected (apparently also in BIFF8!)
			if (preg_match('/^([A-Z]+1\:[A-Z]+)16384$/', $selectedCells)) {
				$selectedCells = preg_replace('/^([A-Z]+1\:[A-Z]+)16384$/', '${1}1048576', $selectedCells);
			}

			// first row '1' + last row '65536' indicates that full column is selected
			if (preg_match('/^([A-Z]+1\:[A-Z]+)65536$/', $selectedCells)) {
				$selectedCells = preg_replace('/^([A-Z]+1\:[A-Z]+)65536$/', '${1}1048576', $selectedCells);
			}

			// first column 'A' + last column 'IV' indicates that full row is selected
			if (preg_match('/^(A[0-9]+\:)IV([0-9]+)$/', $selectedCells)) {
				$selectedCells = preg_replace('/^(A[0-9]+\:)IV([0-9]+)$/', '${1}XFD${2}', $selectedCells);
			}

			$this->_phpSheet->setSelectedCells($selectedCells);
		}
	}

	private function _includeCellRangeFiltered($cellRangeAddress)
	{
		$includeCellRange = true;
		if (!is_null($this->getReadFilter())) {
			$includeCellRange = false;
			$rangeBoundaries = PHPExcel_Cell::getRangeBoundaries($cellRangeAddress);
			for ($row = $rangeBoundaries[0][1]; $row <= $rangeBoundaries[1][1]; $row++) {
				for ($column = $rangeBoundaries[0][0]; $column <= $rangeBoundaries[1][0]; $column++) {
					if ($this->getReadFilter()->readCell($column, $row, $this->_phpSheet->getTitle())) {
						$includeCellRange = true;
						break 2;
					}
				}
			}
		}
		return $includeCellRange;
	}

	/**
	 * MERGEDCELLS
	 *
	 * This record contains the addresses of merged cell ranges
	 * in the current sheet.
	 *
	 * --	"OpenOffice.org's Documentation of the Microsoft
	 * 		Excel File Format"
	 */
	private function _readMergedCells()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_version == self::XLS_BIFF8 && !$this->_readDataOnly) {
			$cellRangeAddressList = $this->_readBIFF8CellRangeAddressList($recordData);
			foreach ($cellRangeAddressList['cellRangeAddresses'] as $cellRangeAddress) {
				if ($this->_includeCellRangeFiltered($cellRangeAddress)) {
					$this->_phpSheet->mergeCells($cellRangeAddress);
				}
			}
		}
	}

	/**
	 * Read HYPERLINK record
	 */
	private function _readHyperLink()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer forward to next record
		$this->_pos += 4 + $length;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 8; cell range address of all cells containing this hyperlink
			try {
				$cellRange = $this->_readBIFF8CellRangeAddressFixed($recordData, 0, 8);
			} catch (Exception $e) {
				return;
			}

			// offset: 8, size: 16; GUID of StdLink

			// offset: 24, size: 4; unknown value

			// offset: 28, size: 4; option flags

				// bit: 0; mask: 0x00000001; 0 = no link or extant, 1 = file link or URL
				$isFileLinkOrUrl = (0x00000001 & self::_GetInt2d($recordData, 28)) >> 0;

				// bit: 1; mask: 0x00000002; 0 = relative path, 1 = absolute path or URL
				$isAbsPathOrUrl = (0x00000001 & self::_GetInt2d($recordData, 28)) >> 1;

				// bit: 2 (and 4); mask: 0x00000014; 0 = no description
				$hasDesc = (0x00000014 & self::_GetInt2d($recordData, 28)) >> 2;

				// bit: 3; mask: 0x00000008; 0 = no text, 1 = has text
				$hasText = (0x00000008 & self::_GetInt2d($recordData, 28)) >> 3;

				// bit: 7; mask: 0x00000080; 0 = no target frame, 1 = has target frame
				$hasFrame = (0x00000080 & self::_GetInt2d($recordData, 28)) >> 7;

				// bit: 8; mask: 0x00000100; 0 = file link or URL, 1 = UNC path (inc. server name)
				$isUNC = (0x00000100 & self::_GetInt2d($recordData, 28)) >> 8;

			// offset within record data
			$offset = 32;

			if ($hasDesc) {
				// offset: 32; size: var; character count of description text
				$dl = self::_GetInt4d($recordData, 32);
				// offset: 36; size: var; character array of description text, no Unicode string header, always 16-bit characters, zero terminated
				$desc = self::_encodeUTF16(substr($recordData, 36, 2 * ($dl - 1)), false);
				$offset += 4 + 2 * $dl;
			}
			if ($hasFrame) {
				$fl = self::_GetInt4d($recordData, $offset);
				$offset += 4 + 2 * $fl;
			}

			// detect type of hyperlink (there are 4 types)
			$hyperlinkType = null;

			if ($isUNC) {
				$hyperlinkType = 'UNC';
			} else if (!$isFileLinkOrUrl) {
				$hyperlinkType = 'workbook';
			} else if (ord($recordData{$offset}) == 0x03) {
				$hyperlinkType = 'local';
			} else if (ord($recordData{$offset}) == 0xE0) {
				$hyperlinkType = 'URL';
			}

			switch ($hyperlinkType) {
			case 'URL':
				// section 5.58.2: Hyperlink containing a URL
				// e.g. http://example.org/index.php

				// offset: var; size: 16; GUID of URL Moniker
				$offset += 16;
				// offset: var; size: 4; size (in bytes) of character array of the URL including trailing zero word
				$us = self::_GetInt4d($recordData, $offset);
				$offset += 4;
				// offset: var; size: $us; character array of the URL, no Unicode string header, always 16-bit characters, zero-terminated
				$url = self::_encodeUTF16(substr($recordData, $offset, $us - 2), false);
				$url .= $hasText ? '#' : '';
				$offset += $us;
				break;

			case 'local':
				// section 5.58.3: Hyperlink to local file
				// examples:
				//   mydoc.txt
				//   ../../somedoc.xls#Sheet!A1

				// offset: var; size: 16; GUI of File Moniker
				$offset += 16;

				// offset: var; size: 2; directory up-level count.
				$upLevelCount = self::_GetInt2d($recordData, $offset);
				$offset += 2;

				// offset: var; size: 4; character count of the shortened file path and name, including trailing zero word
				$sl = self::_GetInt4d($recordData, $offset);
				$offset += 4;

				// offset: var; size: sl; character array of the shortened file path and name in 8.3-DOS-format (compressed Unicode string)
				$shortenedFilePath = substr($recordData, $offset, $sl);
				$shortenedFilePath = self::_encodeUTF16($shortenedFilePath, true);
				$shortenedFilePath = substr($shortenedFilePath, 0, -1); // remove trailing zero

				$offset += $sl;

				// offset: var; size: 24; unknown sequence
				$offset += 24;

				// extended file path
				// offset: var; size: 4; size of the following file link field including string lenth mark
				$sz = self::_GetInt4d($recordData, $offset);
				$offset += 4;

				// only present if $sz > 0
				if ($sz > 0) {
					// offset: var; size: 4; size of the character array of the extended file path and name
					$xl = self::_GetInt4d($recordData, $offset);
					$offset += 4;

					// offset: var; size 2; unknown
					$offset += 2;

					// offset: var; size $xl; character array of the extended file path and name.
					$extendedFilePath = substr($recordData, $offset, $xl);
					$extendedFilePath = self::_encodeUTF16($extendedFilePath, false);
					$offset += $xl;
				}

				// construct the path
				$url = str_repeat('..\\', $upLevelCount);
				$url .= ($sz > 0) ?
					$extendedFilePath : $shortenedFilePath; // use extended path if available
				$url .= $hasText ? '#' : '';

				break;


			case 'UNC':
				// section 5.58.4: Hyperlink to a File with UNC (Universal Naming Convention) Path
				// todo: implement
				return;

			case 'workbook':
				// section 5.58.5: Hyperlink to the Current Workbook
				// e.g. Sheet2!B1:C2, stored in text mark field
				$url = 'sheet://';
				break;

			default:
				return;

			}

			if ($hasText) {
				// offset: var; size: 4; character count of text mark including trailing zero word
				$tl = self::_GetInt4d($recordData, $offset);
				$offset += 4;
				// offset: var; size: var; character array of the text mark without the # sign, no Unicode header, always 16-bit characters, zero-terminated
				$text = self::_encodeUTF16(substr($recordData, $offset, 2 * ($tl - 1)), false);
				$url .= $text;
			}

			// apply the hyperlink to all the relevant cells
			foreach (PHPExcel_Cell::extractAllCellReferencesInRange($cellRange) as $coordinate) {
				$this->_phpSheet->getCell($coordinate)->getHyperLink()->setUrl($url);
			}
		}
	}

	/**
	 * Read DATAVALIDATIONS record
	 */
	private function _readDataValidations()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer forward to next record
		$this->_pos += 4 + $length;
	}

	/**
	 * Read DATAVALIDATION record
	 */
	private function _readDataValidation()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer forward to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly) {
			return;
		}

		// offset: 0; size: 4; Options
		$options = self::_GetInt4d($recordData, 0);

		// bit: 0-3; mask: 0x0000000F; type
		$type = (0x0000000F & $options) >> 0;
		switch ($type) {
			case 0x00:	$type = PHPExcel_Cell_DataValidation::TYPE_NONE;		break;
			case 0x01:	$type = PHPExcel_Cell_DataValidation::TYPE_WHOLE;		break;
			case 0x02:	$type = PHPExcel_Cell_DataValidation::TYPE_DECIMAL;		break;
			case 0x03:	$type = PHPExcel_Cell_DataValidation::TYPE_LIST;		break;
			case 0x04:	$type = PHPExcel_Cell_DataValidation::TYPE_DATE;		break;
			case 0x05:	$type = PHPExcel_Cell_DataValidation::TYPE_TIME;		break;
			case 0x06:	$type = PHPExcel_Cell_DataValidation::TYPE_TEXTLENGTH;	break;
			case 0x07:	$type = PHPExcel_Cell_DataValidation::TYPE_CUSTOM;		break;
		}

		// bit: 4-6; mask: 0x00000070; error type
		$errorStyle = (0x00000070 & $options) >> 4;
		switch ($errorStyle) {
			case 0x00:	$errorStyle = PHPExcel_Cell_DataValidation::STYLE_STOP;			break;
			case 0x01:	$errorStyle = PHPExcel_Cell_DataValidation::STYLE_WARNING;		break;
			case 0x02:	$errorStyle = PHPExcel_Cell_DataValidation::STYLE_INFORMATION;	break;
		}

		// bit: 7; mask: 0x00000080; 1= formula is explicit (only applies to list)
		// I have only seen cases where this is 1
		$explicitFormula = (0x00000080 & $options) >> 7;

		// bit: 8; mask: 0x00000100; 1= empty cells allowed
		$allowBlank = (0x00000100 & $options) >> 8;

		// bit: 9; mask: 0x00000200; 1= suppress drop down arrow in list type validity
		$suppressDropDown = (0x00000200 & $options) >> 9;

		// bit: 18; mask: 0x00040000; 1= show prompt box if cell selected
		$showInputMessage = (0x00040000 & $options) >> 18;

		// bit: 19; mask: 0x00080000; 1= show error box if invalid values entered
		$showErrorMessage = (0x00080000 & $options) >> 19;

		// bit: 20-23; mask: 0x00F00000; condition operator
		$operator = (0x00F00000 & $options) >> 20;
		switch ($operator) {
			case 0x00: $operator = PHPExcel_Cell_DataValidation::OPERATOR_BETWEEN			;	break;
			case 0x01: $operator = PHPExcel_Cell_DataValidation::OPERATOR_NOTBETWEEN		;	break;
			case 0x02: $operator = PHPExcel_Cell_DataValidation::OPERATOR_EQUAL				;	break;
			case 0x03: $operator = PHPExcel_Cell_DataValidation::OPERATOR_NOTEQUAL			;	break;
			case 0x04: $operator = PHPExcel_Cell_DataValidation::OPERATOR_GREATERTHAN		;	break;
			case 0x05: $operator = PHPExcel_Cell_DataValidation::OPERATOR_LESSTHAN			;	break;
			case 0x06: $operator = PHPExcel_Cell_DataValidation::OPERATOR_GREATERTHANOREQUAL;	break;
			case 0x07: $operator = PHPExcel_Cell_DataValidation::OPERATOR_LESSTHANOREQUAL	;	break;
		}

		// offset: 4; size: var; title of the prompt box
		$offset = 4;
		$string = self::_readUnicodeStringLong(substr($recordData, $offset));
		$promptTitle = $string['value'] !== chr(0) ?
			$string['value'] : '';
		$offset += $string['size'];

		// offset: var; size: var; title of the error box
		$string = self::_readUnicodeStringLong(substr($recordData, $offset));
		$errorTitle = $string['value'] !== chr(0) ?
			$string['value'] : '';
		$offset += $string['size'];

		// offset: var; size: var; text of the prompt box
		$string = self::_readUnicodeStringLong(substr($recordData, $offset));
		$prompt = $string['value'] !== chr(0) ?
			$string['value'] : '';
		$offset += $string['size'];

		// offset: var; size: var; text of the error box
		$string = self::_readUnicodeStringLong(substr($recordData, $offset));
		$error = $string['value'] !== chr(0) ?
			$string['value'] : '';
		$offset += $string['size'];

		// offset: var; size: 2; size of the formula data for the first condition
		$sz1 = self::_GetInt2d($recordData, $offset);
		$offset += 2;

		// offset: var; size: 2; not used
		$offset += 2;

		// offset: var; size: $sz1; formula data for first condition (without size field)
		$formula1 = substr($recordData, $offset, $sz1);
		$formula1 = pack('v', $sz1) . $formula1; // prepend the length
		try {
			$formula1 = $this->_getFormulaFromStructure($formula1);

			// in list type validity, null characters are used as item separators
			if ($type == PHPExcel_Cell_DataValidation::TYPE_LIST) {
				$formula1 = str_replace(chr(0), ',', $formula1);
			}
		} catch (Exception $e) {
			return;
		}
		$offset += $sz1;

		// offset: var; size: 2; size of the formula data for the first condition
		$sz2 = self::_GetInt2d($recordData, $offset);
		$offset += 2;

		// offset: var; size: 2; not used
		$offset += 2;

		// offset: var; size: $sz2; formula data for second condition (without size field)
		$formula2 = substr($recordData, $offset, $sz2);
		$formula2 = pack('v', $sz2) . $formula2; // prepend the length
		try {
			$formula2 = $this->_getFormulaFromStructure($formula2);
		} catch (Exception $e) {
			return;
		}
		$offset += $sz2;

		// offset: var; size: var; cell range address list with
		$cellRangeAddressList = $this->_readBIFF8CellRangeAddressList(substr($recordData, $offset));
		$cellRangeAddresses = $cellRangeAddressList['cellRangeAddresses'];

		foreach ($cellRangeAddresses as $cellRange) {
			$stRange = $this->_phpSheet->shrinkRangeToFit($cellRange);
			$stRange = PHPExcel_Cell::extractAllCellReferencesInRange($stRange);
			foreach ($stRange as $coordinate) {
				$objValidation = $this->_phpSheet->getCell($coordinate)->getDataValidation();
				$objValidation->setType($type);
				$objValidation->setErrorStyle($errorStyle);
				$objValidation->setAllowBlank((bool)$allowBlank);
				$objValidation->setShowInputMessage((bool)$showInputMessage);
				$objValidation->setShowErrorMessage((bool)$showErrorMessage);
				$objValidation->setShowDropDown(!$suppressDropDown);
				$objValidation->setOperator($operator);
				$objValidation->setErrorTitle($errorTitle);
				$objValidation->setError($error);
				$objValidation->setPromptTitle($promptTitle);
				$objValidation->setPrompt($prompt);
				$objValidation->setFormula1($formula1);
				$objValidation->setFormula2($formula2);
			}
		}

	}

	/**
	 * Read SHEETLAYOUT record. Stores sheet tab color information.
	 */
	private function _readSheetLayout()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// local pointer in record data
		$offset = 0;

		if (!$this->_readDataOnly) {
			// offset: 0; size: 2; repeated record identifier 0x0862

			// offset: 2; size: 10; not used

			// offset: 12; size: 4; size of record data
			// Excel 2003 uses size of 0x14 (documented), Excel 2007 uses size of 0x28 (not documented?)
			$sz = self::_GetInt4d($recordData, 12);

			switch ($sz) {
				case 0x14:
					// offset: 16; size: 2; color index for sheet tab
					$colorIndex = self::_GetInt2d($recordData, 16);
					$color = self::_readColor($colorIndex,$this->_palette,$this->_version);
					$this->_phpSheet->getTabColor()->setRGB($color['rgb']);
					break;

				case 0x28:
					// TODO: Investigate structure for .xls SHEETLAYOUT record as saved by MS Office Excel 2007
					return;
					break;
			}
		}
	}

	/**
	 * Read SHEETPROTECTION record (FEATHEADR)
	 */
	private function _readSheetProtection()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		if ($this->_readDataOnly) {
			return;
		}

		// offset: 0; size: 2; repeated record header

		// offset: 2; size: 2; FRT cell reference flag (=0 currently)

		// offset: 4; size: 8; Currently not used and set to 0

		// offset: 12; size: 2; Shared feature type index (2=Enhanced Protetion, 4=SmartTag)
		$isf = self::_GetInt2d($recordData, 12);
		if ($isf != 2) {
			return;
		}

		// offset: 14; size: 1; =1 since this is a feat header

		// offset: 15; size: 4; size of rgbHdrSData

		// rgbHdrSData, assume "Enhanced Protection"
		// offset: 19; size: 2; option flags
		$options = self::_GetInt2d($recordData, 19);

		// bit: 0; mask 0x0001; 1 = user may edit objects, 0 = users must not edit objects
		$bool = (0x0001 & $options) >> 0;
		$this->_phpSheet->getProtection()->setObjects(!$bool);

		// bit: 1; mask 0x0002; edit scenarios
		$bool = (0x0002 & $options) >> 1;
		$this->_phpSheet->getProtection()->setScenarios(!$bool);

		// bit: 2; mask 0x0004; format cells
		$bool = (0x0004 & $options) >> 2;
		$this->_phpSheet->getProtection()->setFormatCells(!$bool);

		// bit: 3; mask 0x0008; format columns
		$bool = (0x0008 & $options) >> 3;
		$this->_phpSheet->getProtection()->setFormatColumns(!$bool);

		// bit: 4; mask 0x0010; format rows
		$bool = (0x0010 & $options) >> 4;
		$this->_phpSheet->getProtection()->setFormatRows(!$bool);

		// bit: 5; mask 0x0020; insert columns
		$bool = (0x0020 & $options) >> 5;
		$this->_phpSheet->getProtection()->setInsertColumns(!$bool);

		// bit: 6; mask 0x0040; insert rows
		$bool = (0x0040 & $options) >> 6;
		$this->_phpSheet->getProtection()->setInsertRows(!$bool);

		// bit: 7; mask 0x0080; insert hyperlinks
		$bool = (0x0080 & $options) >> 7;
		$this->_phpSheet->getProtection()->setInsertHyperlinks(!$bool);

		// bit: 8; mask 0x0100; delete columns
		$bool = (0x0100 & $options) >> 8;
		$this->_phpSheet->getProtection()->setDeleteColumns(!$bool);

		// bit: 9; mask 0x0200; delete rows
		$bool = (0x0200 & $options) >> 9;
		$this->_phpSheet->getProtection()->setDeleteRows(!$bool);

		// bit: 10; mask 0x0400; select locked cells
		$bool = (0x0400 & $options) >> 10;
		$this->_phpSheet->getProtection()->setSelectLockedCells(!$bool);

		// bit: 11; mask 0x0800; sort cell range
		$bool = (0x0800 & $options) >> 11;
		$this->_phpSheet->getProtection()->setSort(!$bool);

		// bit: 12; mask 0x1000; auto filter
		$bool = (0x1000 & $options) >> 12;
		$this->_phpSheet->getProtection()->setAutoFilter(!$bool);

		// bit: 13; mask 0x2000; pivot tables
		$bool = (0x2000 & $options) >> 13;
		$this->_phpSheet->getProtection()->setPivotTables(!$bool);

		// bit: 14; mask 0x4000; select unlocked cells
		$bool = (0x4000 & $options) >> 14;
		$this->_phpSheet->getProtection()->setSelectUnlockedCells(!$bool);

		// offset: 21; size: 2; not used
	}

	/**
	 * Read RANGEPROTECTION record
	 * Reading of this record is based on Microsoft Office Excel 97-2000 Binary File Format Specification,
	 * where it is referred to as FEAT record
	 */
	private function _readRangeProtection()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// move stream pointer to next record
		$this->_pos += 4 + $length;

		// local pointer in record data
		$offset = 0;

		if (!$this->_readDataOnly) {
			$offset += 12;

			// offset: 12; size: 2; shared feature type, 2 = enhanced protection, 4 = smart tag
			$isf = self::_GetInt2d($recordData, 12);
			if ($isf != 2) {
				// we only read FEAT records of type 2
				return;
			}
			$offset += 2;

			$offset += 5;

			// offset: 19; size: 2; count of ref ranges this feature is on
			$cref = self::_GetInt2d($recordData, 19);
			$offset += 2;

			$offset += 6;

			// offset: 27; size: 8 * $cref; list of cell ranges (like in hyperlink record)
			$cellRanges = array();
			for ($i = 0; $i < $cref; ++$i) {
				try {
					$cellRange = $this->_readBIFF8CellRangeAddressFixed(substr($recordData, 27 + 8 * $i, 8));
				} catch (Exception $e) {
					return;
				}
				$cellRanges[] = $cellRange;
				$offset += 8;
			}

			// offset: var; size: var; variable length of feature specific data
			$rgbFeat = substr($recordData, $offset);
			$offset += 4;

			// offset: var; size: 4; the encrypted password (only 16-bit although field is 32-bit)
			$wPassword = self::_GetInt4d($recordData, $offset);
			$offset += 4;

			// Apply range protection to sheet
			if ($cellRanges) {
				$this->_phpSheet->protectCells(implode(' ', $cellRanges), strtoupper(dechex($wPassword)), true);
			}
		}
	}

	/**
	 * Read IMDATA record
	 */
	private function _readImData()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);

		// get spliced record data
		$splicedRecordData = $this->_getSplicedRecordData();
		$recordData = $splicedRecordData['recordData'];

		// UNDER CONSTRUCTION

		// offset: 0; size: 2; image format
		$cf = self::_GetInt2d($recordData, 0);

		// offset: 2; size: 2; environment from which the file was written
		$env = self::_GetInt2d($recordData, 2);

		// offset: 4; size: 4; length of the image data
		$lcb = self::_GetInt4d($recordData, 4);

		// offset: 8; size: var; image data
		$iData = substr($recordData, 8);

		switch ($cf) {
		case 0x09: // Windows bitmap format
			// BITMAPCOREINFO
			// 1. BITMAPCOREHEADER
			// offset: 0; size: 4; bcSize, Specifies the number of bytes required by the structure
			$bcSize = self::_GetInt4d($iData, 0);
//			var_dump($bcSize);

			// offset: 4; size: 2; bcWidth, specifies the width of the bitmap, in pixels
			$bcWidth = self::_GetInt2d($iData, 4);
//			var_dump($bcWidth);

			// offset: 6; size: 2; bcHeight, specifies the height of the bitmap, in pixels.
			$bcHeight = self::_GetInt2d($iData, 6);
//			var_dump($bcHeight);
			$ih = imagecreatetruecolor($bcWidth, $bcHeight);

			// offset: 8; size: 2; bcPlanes, specifies the number of planes for the target device. This value must be 1

			// offset: 10; size: 2; bcBitCount specifies the number of bits-per-pixel. This value must be 1, 4, 8, or 24
			$bcBitCount = self::_GetInt2d($iData, 10);
//			var_dump($bcBitCount);

			$rgbString = substr($iData, 12);
			$rgbTriples = array();
			while (strlen($rgbString) > 0) {
				$rgbTriples[] = unpack('Cb/Cg/Cr', $rgbString);
				$rgbString = substr($rgbString, 3);
			}
			$x = 0;
			$y = 0;
			foreach ($rgbTriples as $i => $rgbTriple) {
				$color = imagecolorallocate($ih, $rgbTriple['r'], $rgbTriple['g'], $rgbTriple['b']);
				imagesetpixel($ih, $x, $bcHeight - 1 - $y, $color);
				$x = ($x + 1) % $bcWidth;
				$y = $y + floor(($x + 1) / $bcWidth);
			}
			//imagepng($ih, 'image.png');

			$drawing = new PHPExcel_Worksheet_Drawing();
			$drawing->setPath($filename);
			$drawing->setWorksheet($this->_phpSheet);

			break;

		case 0x02: // Windows metafile or Macintosh PICT format
		case 0x0e: // native format
		default;
			break;

		}

		// _getSplicedRecordData() takes care of moving current position in data stream
	}

	/**
	 * Read a free CONTINUE record. Free CONTINUE record may be a camouflaged MSODRAWING record
	 * When MSODRAWING data on a sheet exceeds 8224 bytes, CONTINUE records are used instead. Undocumented.
	 * In this case, we must treat the CONTINUE record as a MSODRAWING record
	 */
	private function _readContinue()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);
		$recordData = substr($this->_data, $this->_pos + 4, $length);

		// check if we are reading drawing data
		// this is in case a free CONTINUE record occurs in other circumstances we are unaware of
		if ($this->_drawingData == '') {
			// move stream pointer to next record
			$this->_pos += 4 + $length;

			return;
		}

		// check if record data is at least 4 bytes long, otherwise there is no chance this is MSODRAWING data
		if ($length < 4) {
			// move stream pointer to next record
			$this->_pos += 4 + $length;

			return;
		}

		// dirty check to see if CONTINUE record could be a camouflaged MSODRAWING record
		// look inside CONTINUE record to see if it looks like a part of an Escher stream
		// we know that Escher stream may be split at least at
		//		0xF003 MsofbtSpgrContainer
		//		0xF004 MsofbtSpContainer
		//		0xF00D MsofbtClientTextbox
		$validSplitPoints = array(0xF003, 0xF004, 0xF00D); // add identifiers if we find more

		$splitPoint = self::_GetInt2d($recordData, 2);
		if (in_array($splitPoint, $validSplitPoints)) {
			// get spliced record data (and move pointer to next record)
			$splicedRecordData = $this->_getSplicedRecordData();
			$this->_drawingData .= $splicedRecordData['recordData'];

			return;
		}

		// move stream pointer to next record
		$this->_pos += 4 + $length;

	}


	/**
	 * Reads a record from current position in data stream and continues reading data as long as CONTINUE
	 * records are found. Splices the record data pieces and returns the combined string as if record data
	 * is in one piece.
	 * Moves to next current position in data stream to start of next record different from a CONtINUE record
	 *
	 * @return array
	 */
	private function _getSplicedRecordData()
	{
		$data = '';
		$spliceOffsets = array();

		$i = 0;
		$spliceOffsets[0] = 0;

		do {
			++$i;

			// offset: 0; size: 2; identifier
			$identifier = self::_GetInt2d($this->_data, $this->_pos);
			// offset: 2; size: 2; length
			$length = self::_GetInt2d($this->_data, $this->_pos + 2);
			$data .= substr($this->_data, $this->_pos + 4, $length);

			$spliceOffsets[$i] = $spliceOffsets[$i - 1] + $length;

			$this->_pos += 4 + $length;
			$nextIdentifier = self::_GetInt2d($this->_data, $this->_pos);
		}
		while ($nextIdentifier == self::XLS_Type_CONTINUE);

		$splicedData = array(
			'recordData' => $data,
			'spliceOffsets' => $spliceOffsets,
		);

		return $splicedData;

	}

	/**
	 * Convert formula structure into human readable Excel formula like 'A3+A5*5'
	 *
	 * @param string $formulaStructure The complete binary data for the formula
	 * @param string $baseCell Base cell, only needed when formula contains tRefN tokens, e.g. with shared formulas
	 * @return string Human readable formula
	 */
	private function _getFormulaFromStructure($formulaStructure, $baseCell = 'A1')
	{
		// offset: 0; size: 2; size of the following formula data
		$sz = self::_GetInt2d($formulaStructure, 0);

		// offset: 2; size: sz
		$formulaData = substr($formulaStructure, 2, $sz);

		// for debug: dump the formula data
		//echo '<xmp>';
		//echo 'size: ' . $sz . "\n";
		//echo 'the entire formula data: ';
		//Debug::dump($formulaData);
		//echo "\n----\n";

		// offset: 2 + sz; size: variable (optional)
		if (strlen($formulaStructure) > 2 + $sz) {
			$additionalData = substr($formulaStructure, 2 + $sz);

			// for debug: dump the additional data
			//echo 'the entire additional data: ';
			//Debug::dump($additionalData);
			//echo "\n----\n";

		} else {
			$additionalData = '';
		}

		return $this->_getFormulaFromData($formulaData, $additionalData, $baseCell);
	}

	/**
	 * Take formula data and additional data for formula and return human readable formula
	 *
	 * @param string $formulaData The binary data for the formula itself
	 * @param string $additionalData Additional binary data going with the formula
	 * @param string $baseCell Base cell, only needed when formula contains tRefN tokens, e.g. with shared formulas
	 * @return string Human readable formula
	 */
	private function _getFormulaFromData($formulaData,  $additionalData = '', $baseCell = 'A1')
	{
		// start parsing the formula data
		$tokens = array();

		while (strlen($formulaData) > 0 and $token = $this->_getNextToken($formulaData, $baseCell)) {
			$tokens[] = $token;
			$formulaData = substr($formulaData, $token['size']);

			// for debug: dump the token
			//var_dump($token);
		}

		$formulaString = $this->_createFormulaFromTokens($tokens, $additionalData);

		return $formulaString;
	}

	/**
	 * Take array of tokens together with additional data for formula and return human readable formula
	 *
	 * @param array $tokens
	 * @param array $additionalData Additional binary data going with the formula
	 * @param string $baseCell Base cell, only needed when formula contains tRefN tokens, e.g. with shared formulas
	 * @return string Human readable formula
	 */
	private function _createFormulaFromTokens($tokens, $additionalData)
	{
		// empty formula?
		if (count($tokens) == 0) {
			return '';
		}

		$formulaStrings = array();
		foreach ($tokens as $token) {
			// initialize spaces
			$space0 = isset($space0) ? $space0 : ''; // spaces before next token, not tParen
			$space1 = isset($space1) ? $space1 : ''; // carriage returns before next token, not tParen
			$space2 = isset($space2) ? $space2 : ''; // spaces before opening parenthesis
			$space3 = isset($space3) ? $space3 : ''; // carriage returns before opening parenthesis
			$space4 = isset($space4) ? $space4 : ''; // spaces before closing parenthesis
			$space5 = isset($space5) ? $space5 : ''; // carriage returns before closing parenthesis

			switch ($token['name']) {
			case 'tAdd': // addition
			case 'tConcat': // addition
			case 'tDiv': // division
			case 'tEQ': // equality
			case 'tGE': // greater than or equal
			case 'tGT': // greater than
			case 'tIsect': // intersection
			case 'tLE': // less than or equal
			case 'tList': // less than or equal
			case 'tLT': // less than
			case 'tMul': // multiplication
			case 'tNE': // multiplication
			case 'tPower': // power
			case 'tRange': // range
			case 'tSub': // subtraction
				$op2 = array_pop($formulaStrings);
				$op1 = array_pop($formulaStrings);
				$formulaStrings[] = "$op1$space1$space0{$token['data']}$op2";
				unset($space0, $space1);
				break;
			case 'tUplus': // unary plus
			case 'tUminus': // unary minus
				$op = array_pop($formulaStrings);
				$formulaStrings[] = "$space1$space0{$token['data']}$op";
				unset($space0, $space1);
				break;
			case 'tPercent': // percent sign
				$op = array_pop($formulaStrings);
				$formulaStrings[] = "$op$space1$space0{$token['data']}";
				unset($space0, $space1);
				break;
			case 'tAttrVolatile': // indicates volatile function
			case 'tAttrIf':
			case 'tAttrSkip':
			case 'tAttrChoose':
				// token is only important for Excel formula evaluator
				// do nothing
				break;
			case 'tAttrSpace': // space / carriage return
				// space will be used when next token arrives, do not alter formulaString stack
				switch ($token['data']['spacetype']) {
				case 'type0':
					$space0 = str_repeat(' ', $token['data']['spacecount']);
					break;
				case 'type1':
					$space1 = str_repeat("\n", $token['data']['spacecount']);
					break;
				case 'type2':
					$space2 = str_repeat(' ', $token['data']['spacecount']);
					break;
				case 'type3':
					$space3 = str_repeat("\n", $token['data']['spacecount']);
					break;
				case 'type4':
					$space4 = str_repeat(' ', $token['data']['spacecount']);
					break;
				case 'type5':
					$space5 = str_repeat("\n", $token['data']['spacecount']);
					break;
				}
				break;
			case 'tAttrSum': // SUM function with one parameter
				$op = array_pop($formulaStrings);
				$formulaStrings[] = "{$space1}{$space0}SUM($op)";
				unset($space0, $space1);
				break;
			case 'tFunc': // function with fixed number of arguments
			case 'tFuncV': // function with variable number of arguments
				if ($token['data']['function'] != '') {
					// normal function
					$ops = array(); // array of operators
					for ($i = 0; $i < $token['data']['args']; ++$i) {
						$ops[] = array_pop($formulaStrings);
					}
					$ops = array_reverse($ops);
					$formulaStrings[] = "$space1$space0{$token['data']['function']}(" . implode(',', $ops) . ")";
					unset($space0, $space1);
				} else {
					// add-in function
					$ops = array(); // array of operators
					for ($i = 0; $i < $token['data']['args'] - 1; ++$i) {
						$ops[] = array_pop($formulaStrings);
					}
					$ops = array_reverse($ops);
					$function = array_pop($formulaStrings);
					$formulaStrings[] = "$space1$space0$function(" . implode(',', $ops) . ")";
					unset($space0, $space1);
				}
				break;
			case 'tParen': // parenthesis
				$expression = array_pop($formulaStrings);
				$formulaStrings[] = "$space3$space2($expression$space5$space4)";
				unset($space2, $space3, $space4, $space5);
				break;
			case 'tArray': // array constant
				$constantArray = self::_readBIFF8ConstantArray($additionalData);
				$formulaStrings[] = $space1 . $space0 . $constantArray['value'];
				$additionalData = substr($additionalData, $constantArray['size']); // bite of chunk of additional data
				unset($space0, $space1);
				break;
			case 'tMemArea':
				// bite off chunk of additional data
				$cellRangeAddressList = $this->_readBIFF8CellRangeAddressList($additionalData);
				$additionalData = substr($additionalData, $cellRangeAddressList['size']);
				$formulaStrings[] = "$space1$space0{$token['data']}";
				unset($space0, $space1);
				break;
			case 'tArea': // cell range address
			case 'tBool': // boolean
			case 'tErr': // error code
			case 'tInt': // integer
			case 'tMemErr':
			case 'tMemFunc':
			case 'tMissArg':
			case 'tName':
			case 'tNameX':
			case 'tNum': // number
			case 'tRef': // single cell reference
			case 'tRef3d': // 3d cell reference
			case 'tArea3d': // 3d cell range reference
			case 'tRefN':
			case 'tAreaN':
			case 'tStr': // string
				$formulaStrings[] = "$space1$space0{$token['data']}";
				unset($space0, $space1);
				break;
			}
		}
		$formulaString = $formulaStrings[0];

		// for debug: dump the human readable formula
		//echo '----' . "\n";
		//echo 'Formula: ' . $formulaString;

		return $formulaString;
	}

	/**
	 * Fetch next token from binary formula data
	 *
	 * @param string Formula data
	 * @param string $baseCell Base cell, only needed when formula contains tRefN tokens, e.g. with shared formulas
	 * @return array
	 * @throws Exception
	 */
	private function _getNextToken($formulaData, $baseCell = 'A1')
	{
		// offset: 0; size: 1; token id
		$id = ord($formulaData[0]); // token id
		$name = false; // initialize token name

		switch ($id) {
		case 0x03: $name = 'tAdd';		$size = 1;	$data = '+';	break;
		case 0x04: $name = 'tSub';		$size = 1;	$data = '-';	break;
		case 0x05: $name = 'tMul';		$size = 1;	$data = '*';	break;
		case 0x06: $name = 'tDiv';		$size = 1;	$data = '/';	break;
		case 0x07: $name = 'tPower';	$size = 1;	$data = '^';	break;
		case 0x08: $name = 'tConcat';	$size = 1;	$data = '&';	break;
		case 0x09: $name = 'tLT';		$size = 1;	$data = '<';	break;
		case 0x0A: $name = 'tLE';		$size = 1;	$data = '<=';	break;
		case 0x0B: $name = 'tEQ';		$size = 1;	$data = '=';	break;
		case 0x0C: $name = 'tGE';		$size = 1;	$data = '>=';	break;
		case 0x0D: $name = 'tGT';		$size = 1;	$data = '>';	break;
		case 0x0E: $name = 'tNE';		$size = 1;	$data = '<>';	break;
		case 0x0F: $name = 'tIsect';	$size = 1;	$data = ' ';	break;
		case 0x10: $name = 'tList';		$size = 1;	$data = ',';	break;
		case 0x11: $name = 'tRange';	$size = 1;	$data = ':';	break;
		case 0x12: $name = 'tUplus';	$size = 1;	$data = '+';	break;
		case 0x13: $name = 'tUminus';	$size = 1;	$data = '-';	break;
		case 0x14: $name = 'tPercent';	$size = 1;	$data = '%';	break;
		case 0x15:	//	parenthesis
			$name  = 'tParen';
			$size  = 1;
			$data = null;
			break;
		case 0x16:	//	missing argument
			$name = 'tMissArg';
			$size = 1;
			$data = '';
			break;
		case 0x17:	//	string
			$name = 'tStr';
			// offset: 1; size: var; Unicode string, 8-bit string length
			$string = self::_readUnicodeStringShort(substr($formulaData, 1));
			$size = 1 + $string['size'];
			$data = self::_UTF8toExcelDoubleQuoted($string['value']);
			break;
		case 0x19:	//	Special attribute
			// offset: 1; size: 1; attribute type flags:
			switch (ord($formulaData[1])) {
			case 0x01:
				$name = 'tAttrVolatile';
				$size = 4;
				$data = null;
				break;
			case 0x02:
				$name = 'tAttrIf';
				$size = 4;
				$data = null;
				break;
			case 0x04:
				$name = 'tAttrChoose';
				// offset: 2; size: 2; number of choices in the CHOOSE function ($nc, number of parameters decreased by 1)
				$nc = self::_GetInt2d($formulaData, 2);
				// offset: 4; size: 2 * $nc
				// offset: 4 + 2 * $nc; size: 2
				$size = 2 * $nc + 6;
				$data = null;
				break;
			case 0x08:
				$name = 'tAttrSkip';
				$size = 4;
				$data = null;
				break;
			case 0x10:
				$name = 'tAttrSum';
				$size = 4;
				$data = null;
				break;
			case 0x40:
			case 0x41:
				$name = 'tAttrSpace';
				$size = 4;
				// offset: 2; size: 2; space type and position
				switch (ord($formulaData[2])) {
				case 0x00:
					$spacetype = 'type0';
					break;
				case 0x01:
					$spacetype = 'type1';
					break;
				case 0x02:
					$spacetype = 'type2';
					break;
				case 0x03:
					$spacetype = 'type3';
					break;
				case 0x04:
					$spacetype = 'type4';
					break;
				case 0x05:
					$spacetype = 'type5';
					break;
				default:
					throw new Exception('Unrecognized space type in tAttrSpace token');
					break;
				}
				// offset: 3; size: 1; number of inserted spaces/carriage returns
				$spacecount = ord($formulaData[3]);

				$data = array('spacetype' => $spacetype, 'spacecount' => $spacecount);
				break;
			default:
				throw new Exception('Unrecognized attribute flag in tAttr token');
				break;
			}
			break;
		case 0x1C:	//	error code
			// offset: 1; size: 1; error code
			$name = 'tErr';
			$size = 2;
			$data = self::_mapErrorCode(ord($formulaData[1]));
			break;
		case 0x1D:	//	boolean
			// offset: 1; size: 1; 0 = false, 1 = true;
			$name = 'tBool';
			$size = 2;
			$data = ord($formulaData[1]) ? 'TRUE' : 'FALSE';
			break;
		case 0x1E:	//	integer
			// offset: 1; size: 2; unsigned 16-bit integer
			$name = 'tInt';
			$size = 3;
			$data = self::_GetInt2d($formulaData, 1);
			break;
		case 0x1F:	//	number
			// offset: 1; size: 8;
			$name = 'tNum';
			$size = 9;
			$data = self::_extractNumber(substr($formulaData, 1));
			$data = str_replace(',', '.', (string)$data); // in case non-English locale
			break;
		case 0x20:	//	array constant
		case 0x40:
		case 0x60:
			// offset: 1; size: 7; not used
			$name = 'tArray';
			$size = 8;
			$data = null;
			break;
		case 0x21:	//	function with fixed number of arguments
		case 0x41:
		case 0x61:
			$name = 'tFunc';
			$size = 3;
			// offset: 1; size: 2; index to built-in sheet function
			switch (self::_GetInt2d($formulaData, 1)) {
			case   2: $function = 'ISNA'; 			$args = 1; 	break;
			case   3: $function = 'ISERROR'; 		$args = 1; 	break;
			case  10: $function = 'NA'; 			$args = 0; 	break;
			case  15: $function = 'SIN'; 			$args = 1; 	break;
			case  16: $function = 'COS'; 			$args = 1; 	break;
			case  17: $function = 'TAN'; 			$args = 1; 	break;
			case  18: $function = 'ATAN'; 			$args = 1; 	break;
			case  19: $function = 'PI'; 			$args = 0; 	break;
			case  20: $function = 'SQRT'; 			$args = 1; 	break;
			case  21: $function = 'EXP'; 			$args = 1; 	break;
			case  22: $function = 'LN'; 			$args = 1; 	break;
			case  23: $function = 'LOG10'; 			$args = 1; 	break;
			case  24: $function = 'ABS'; 			$args = 1; 	break;
			case  25: $function = 'INT'; 			$args = 1; 	break;
			case  26: $function = 'SIGN'; 			$args = 1; 	break;
			case  27: $function = 'ROUND'; 			$args = 2; 	break;
			case  30: $function = 'REPT'; 			$args = 2; 	break;
			case  31: $function = 'MID'; 			$args = 3; 	break;
			case  32: $function = 'LEN'; 			$args = 1; 	break;
			case  33: $function = 'VALUE'; 			$args = 1; 	break;
			case  34: $function = 'TRUE'; 			$args = 0; 	break;
			case  35: $function = 'FALSE'; 			$args = 0; 	break;
			case  38: $function = 'NOT'; 			$args = 1; 	break;
			case  39: $function = 'MOD'; 			$args = 2;	break;
			case  40: $function = 'DCOUNT'; 		$args = 3;	break;
			case  41: $function = 'DSUM'; 			$args = 3;	break;
			case  42: $function = 'DAVERAGE'; 		$args = 3;	break;
			case  43: $function = 'DMIN'; 			$args = 3;	break;
			case  44: $function = 'DMAX'; 			$args = 3;	break;
			case  45: $function = 'DSTDEV'; 		$args = 3;	break;
			case  48: $function = 'TEXT'; 			$args = 2;	break;
			case  61: $function = 'MIRR'; 			$args = 3;	break;
			case  63: $function = 'RAND'; 			$args = 0;	break;
			case  65: $function = 'DATE'; 			$args = 3;	break;
			case  66: $function = 'TIME'; 			$args = 3;	break;
			case  67: $function = 'DAY'; 			$args = 1;	break;
			case  68: $function = 'MONTH'; 			$args = 1;	break;
			case  69: $function = 'YEAR'; 			$args = 1;	break;
			case  71: $function = 'HOUR'; 			$args = 1;	break;
			case  72: $function = 'MINUTE'; 		$args = 1;	break;
			case  73: $function = 'SECOND'; 		$args = 1;	break;
			case  74: $function = 'NOW'; 			$args = 0;	break;
			case  75: $function = 'AREAS'; 			$args = 1;	break;
			case  76: $function = 'ROWS'; 			$args = 1;	break;
			case  77: $function = 'COLUMNS'; 		$args = 1;	break;
			case  83: $function = 'TRANSPOSE'; 		$args = 1;	break;
			case  86: $function = 'TYPE'; 			$args = 1;	break;
			case  97: $function = 'ATAN2'; 			$args = 2;	break;
			case  98: $function = 'ASIN'; 			$args = 1;	break;
			case  99: $function = 'ACOS'; 			$args = 1;	break;
			case 105: $function = 'ISREF'; 			$args = 1;	break;
			case 111: $function = 'CHAR'; 			$args = 1;	break;
			case 112: $function = 'LOWER'; 			$args = 1;	break;
			case 113: $function = 'UPPER'; 			$args = 1;	break;
			case 114: $function = 'PROPER'; 		$args = 1;	break;
			case 117: $function = 'EXACT'; 			$args = 2;	break;
			case 118: $function = 'TRIM'; 			$args = 1;	break;
			case 119: $function = 'REPLACE'; 		$args = 4;	break;
			case 121: $function = 'CODE'; 			$args = 1;	break;
			case 126: $function = 'ISERR'; 			$args = 1;	break;
			case 127: $function = 'ISTEXT'; 		$args = 1;	break;
			case 128: $function = 'ISNUMBER'; 		$args = 1;	break;
			case 129: $function = 'ISBLANK'; 		$args = 1;	break;
			case 130: $function = 'T'; 				$args = 1;	break;
			case 131: $function = 'N'; 				$args = 1;	break;
			case 140: $function = 'DATEVALUE'; 		$args = 1;	break;
			case 141: $function = 'TIMEVALUE'; 		$args = 1;	break;
			case 142: $function = 'SLN'; 			$args = 3;	break;
			case 143: $function = 'SYD'; 			$args = 4;	break;
			case 162: $function = 'CLEAN'; 			$args = 1;	break;
			case 163: $function = 'MDETERM'; 		$args = 1;	break;
			case 164: $function = 'MINVERSE'; 		$args = 1;	break;
			case 165: $function = 'MMULT'; 			$args = 2;	break;
			case 184: $function = 'FACT'; 			$args = 1;	break;
			case 189: $function = 'DPRODUCT'; 		$args = 3;	break;
			case 190: $function = 'ISNONTEXT'; 		$args = 1;	break;
			case 195: $function = 'DSTDEVP'; 		$args = 3;	break;
			case 196: $function = 'DVARP'; 			$args = 3;	break;
			case 198: $function = 'ISLOGICAL'; 		$args = 1;	break;
			case 199: $function = 'DCOUNTA'; 		$args = 3;	break;
			case 207: $function = 'REPLACEB'; 		$args = 4;	break;
			case 210: $function = 'MIDB'; 			$args = 3;	break;
			case 211: $function = 'LENB'; 			$args = 1;	break;
			case 212: $function = 'ROUNDUP'; 		$args = 2;	break;
			case 213: $function = 'ROUNDDOWN'; 		$args = 2;	break;
			case 214: $function = 'ASC'; 			$args = 1;	break;
			case 215: $function = 'DBCS'; 			$args = 1;	break;
			case 221: $function = 'TODAY'; 			$args = 0;	break;
			case 229: $function = 'SINH'; 			$args = 1;	break;
			case 230: $function = 'COSH'; 			$args = 1;	break;
			case 231: $function = 'TANH'; 			$args = 1;	break;
			case 232: $function = 'ASINH'; 			$args = 1;	break;
			case 233: $function = 'ACOSH'; 			$args = 1;	break;
			case 234: $function = 'ATANH'; 			$args = 1;	break;
			case 235: $function = 'DGET'; 			$args = 3;	break;
			case 244: $function = 'INFO'; 			$args = 1;	break;
			case 252: $function = 'FREQUENCY'; 		$args = 2;	break;
			case 261: $function = 'ERROR.TYPE'; 	$args = 1;	break;
			case 271: $function = 'GAMMALN'; 		$args = 1;	break;
			case 273: $function = 'BINOMDIST'; 		$args = 4;	break;
			case 274: $function = 'CHIDIST'; 		$args = 2;	break;
			case 275: $function = 'CHIINV'; 		$args = 2;	break;
			case 276: $function = 'COMBIN'; 		$args = 2;	break;
			case 277: $function = 'CONFIDENCE'; 	$args = 3;	break;
			case 278: $function = 'CRITBINOM'; 		$args = 3;	break;
			case 279: $function = 'EVEN'; 			$args = 1;	break;
			case 280: $function = 'EXPONDIST'; 		$args = 3;	break;
			case 281: $function = 'FDIST'; 			$args = 3;	break;
			case 282: $function = 'FINV'; 			$args = 3;	break;
			case 283: $function = 'FISHER'; 		$args = 1;	break;
			case 284: $function = 'FISHERINV'; 		$args = 1;	break;
			case 285: $function = 'FLOOR'; 			$args = 2;	break;
			case 286: $function = 'GAMMADIST'; 		$args = 4;	break;
			case 287: $function = 'GAMMAINV'; 		$args = 3;	break;
			case 288: $function = 'CEILING'; 		$args = 2;	break;
			case 289: $function = 'HYPGEOMDIST';	$args = 4;	break;
			case 290: $function = 'LOGNORMDIST';	$args = 3;	break;
			case 291: $function = 'LOGINV';			$args = 3;	break;
			case 292: $function = 'NEGBINOMDIST';	$args = 3;	break;
			case 293: $function = 'NORMDIST';		$args = 4;	break;
			case 294: $function = 'NORMSDIST';		$args = 1;	break;
			case 295: $function = 'NORMINV';		$args = 3;	break;
			case 296: $function = 'NORMSINV';		$args = 1;	break;
			case 297: $function = 'STANDARDIZE';	$args = 3;	break;
			case 298: $function = 'ODD';			$args = 1;	break;
			case 299: $function = 'PERMUT';			$args = 2;	break;
			case 300: $function = 'POISSON';		$args = 3;	break;
			case 301: $function = 'TDIST';			$args = 3;	break;
			case 302: $function = 'WEIBULL';		$args = 4;	break;
			case 303: $function = 'SUMXMY2';		$args = 2;	break;
			case 304: $function = 'SUMX2MY2';		$args = 2;	break;
			case 305: $function = 'SUMX2PY2';		$args = 2;	break;
			case 306: $function = 'CHITEST';		$args = 2;	break;
			case 307: $function = 'CORREL';			$args = 2;	break;
			case 308: $function = 'COVAR';			$args = 2;	break;
			case 309: $function = 'FORECAST';		$args = 3;	break;
			case 310: $function = 'FTEST';			$args = 2;	break;
			case 311: $function = 'INTERCEPT';		$args = 2;	break;
			case 312: $function = 'PEARSON';		$args = 2;	break;
			case 313: $function = 'RSQ';			$args = 2;	break;
			case 314: $function = 'STEYX';			$args = 2;	break;
			case 315: $function = 'SLOPE';			$args = 2;	break;
			case 316: $function = 'TTEST';			$args = 4;	break;
			case 325: $function = 'LARGE';			$args = 2;	break;
			case 326: $function = 'SMALL';			$args = 2;	break;
			case 327: $function = 'QUARTILE';		$args = 2;	break;
			case 328: $function = 'PERCENTILE';		$args = 2;	break;
			case 331: $function = 'TRIMMEAN';		$args = 2;	break;
			case 332: $function = 'TINV';			$args = 2;	break;
			case 337: $function = 'POWER';			$args = 2;	break;
			case 342: $function = 'RADIANS';		$args = 1;	break;
			case 343: $function = 'DEGREES';		$args = 1;	break;
			case 346: $function = 'COUNTIF';		$args = 2;	break;
			case 347: $function = 'COUNTBLANK';		$args = 1;	break;
			case 350: $function = 'ISPMT';			$args = 4;	break;
			case 351: $function = 'DATEDIF';		$args = 3;	break;
			case 352: $function = 'DATESTRING';		$args = 1;	break;
			case 353: $function = 'NUMBERSTRING';	$args = 2;	break;
			case 360: $function = 'PHONETIC';		$args = 1;	break;
			default:
				throw new Exception('Unrecognized function in formula');
				break;
			}
			$data = array('function' => $function, 'args' => $args);
			break;
		case 0x22:	//	function with variable number of arguments
		case 0x42:
		case 0x62:
			$name = 'tFuncV';
			$size = 4;
			// offset: 1; size: 1; number of arguments
			$args = ord($formulaData[1]);
			// offset: 2: size: 2; index to built-in sheet function
			$index = self::_GetInt2d($formulaData, 2);
			switch ($index) {
			case   0: $function = 'COUNT';			break;
			case   1: $function = 'IF';				break;
			case   4: $function = 'SUM';			break;
			case   5: $function = 'AVERAGE';		break;
			case   6: $function = 'MIN';			break;
			case   7: $function = 'MAX';			break;
			case   8: $function = 'ROW';			break;
			case   9: $function = 'COLUMN';			break;
			case  11: $function = 'NPV';			break;
			case  12: $function = 'STDEV';			break;
			case  13: $function = 'DOLLAR';			break;
			case  14: $function = 'FIXED';			break;
			case  28: $function = 'LOOKUP';			break;
			case  29: $function = 'INDEX';			break;
			case  36: $function = 'AND';			break;
			case  37: $function = 'OR';				break;
			case  46: $function = 'VAR';			break;
			case  49: $function = 'LINEST';			break;
			case  50: $function = 'TREND';			break;
			case  51: $function = 'LOGEST';			break;
			case  52: $function = 'GROWTH';			break;
			case  56: $function = 'PV';				break;
			case  57: $function = 'FV';				break;
			case  58: $function = 'NPER';			break;
			case  59: $function = 'PMT';			break;
			case  60: $function = 'RATE';			break;
			case  62: $function = 'IRR';			break;
			case  64: $function = 'MATCH';			break;
			case  70: $function = 'WEEKDAY';		break;
			case  78: $function = 'OFFSET';			break;
			case  82: $function = 'SEARCH';			break;
			case 100: $function = 'CHOOSE';			break;
			case 101: $function = 'HLOOKUP';		break;
			case 102: $function = 'VLOOKUP';		break;
			case 109: $function = 'LOG';			break;
			case 115: $function = 'LEFT';			break;
			case 116: $function = 'RIGHT';			break;
			case 120: $function = 'SUBSTITUTE';		break;
			case 124: $function = 'FIND';			break;
			case 125: $function = 'CELL';			break;
			case 144: $function = 'DDB';			break;
			case 148: $function = 'INDIRECT';		break;
			case 167: $function = 'IPMT';			break;
			case 168: $function = 'PPMT';			break;
			case 169: $function = 'COUNTA';			break;
			case 183: $function = 'PRODUCT';		break;
			case 193: $function = 'STDEVP';			break;
			case 194: $function = 'VARP';			break;
			case 197: $function = 'TRUNC';			break;
			case 204: $function = 'USDOLLAR';		break;
			case 205: $function = 'FINDB';			break;
			case 206: $function = 'SEARCHB';		break;
			case 208: $function = 'LEFTB';			break;
			case 209: $function = 'RIGHTB';			break;
			case 216: $function = 'RANK';			break;
			case 219: $function = 'ADDRESS';		break;
			case 220: $function = 'DAYS360';		break;
			case 222: $function = 'VDB';			break;
			case 227: $function = 'MEDIAN';			break;
			case 228: $function = 'SUMPRODUCT';		break;
			case 247: $function = 'DB';				break;
			case 255: $function = '';				break;
			case 269: $function = 'AVEDEV';			break;
			case 270: $function = 'BETADIST';		break;
			case 272: $function = 'BETAINV';		break;
			case 317: $function = 'PROB';			break;
			case 318: $function = 'DEVSQ';			break;
			case 319: $function = 'GEOMEAN';		break;
			case 320: $function = 'HARMEAN';		break;
			case 321: $function = 'SUMSQ';			break;
			case 322: $function = 'KURT';			break;
			case 323: $function = 'SKEW';			break;
			case 324: $function = 'ZTEST';			break;
			case 329: $function = 'PERCENTRANK';	break;
			case 330: $function = 'MODE';			break;
			case 336: $function = 'CONCATENATE';	break;
			case 344: $function = 'SUBTOTAL';		break;
			case 345: $function = 'SUMIF';			break;
			case 354: $function = 'ROMAN';			break;
			case 358: $function = 'GETPIVOTDATA';	break;
			case 359: $function = 'HYPERLINK';		break;
			case 361: $function = 'AVERAGEA';		break;
			case 362: $function = 'MAXA';			break;
			case 363: $function = 'MINA';			break;
			case 364: $function = 'STDEVPA';		break;
			case 365: $function = 'VARPA';			break;
			case 366: $function = 'STDEVA';			break;
			case 367: $function = 'VARA';			break;
			default:
				throw new Exception('Unrecognized function in formula');
				break;
			}
			$data = array('function' => $function, 'args' => $args);
			break;
		case 0x23:	//	index to defined name
		case 0x43:
		case 0x63:
			$name = 'tName';
			$size = 5;
			// offset: 1; size: 2; one-based index to definedname record
			$definedNameIndex = self::_GetInt2d($formulaData, 1) - 1;
			// offset: 2; size: 2; not used
			$data = $this->_definedname[$definedNameIndex]['name'];
			break;
		case 0x24:	//	single cell reference e.g. A5
		case 0x44:
		case 0x64:
			$name = 'tRef';
			$size = 5;
			$data = $this->_readBIFF8CellAddress(substr($formulaData, 1, 4));
			break;
		case 0x25:	//	cell range reference to cells in the same sheet (2d)
		case 0x45:
		case 0x65:
			$name = 'tArea';
			$size = 9;
			$data = $this->_readBIFF8CellRangeAddress(substr($formulaData, 1, 8));
			break;
		case 0x26:	//	Constant reference sub-expression
		case 0x46:
		case 0x66:
			$name = 'tMemArea';
			// offset: 1; size: 4; not used
			// offset: 5; size: 2; size of the following subexpression
			$subSize = self::_GetInt2d($formulaData, 5);
			$size = 7 + $subSize;
			$data = $this->_getFormulaFromData(substr($formulaData, 7, $subSize));
			break;
		case 0x27:	//	Deleted constant reference sub-expression
		case 0x47:
		case 0x67:
			$name = 'tMemErr';
			// offset: 1; size: 4; not used
			// offset: 5; size: 2; size of the following subexpression
			$subSize = self::_GetInt2d($formulaData, 5);
			$size = 7 + $subSize;
			$data = $this->_getFormulaFromData(substr($formulaData, 7, $subSize));
			break;
		case 0x29:	//	Variable reference sub-expression
		case 0x49:
		case 0x69:
			$name = 'tMemFunc';
			// offset: 1; size: 2; size of the following sub-expression
			$subSize = self::_GetInt2d($formulaData, 1);
			$size = 3 + $subSize;
			$data = $this->_getFormulaFromData(substr($formulaData, 3, $subSize));
			break;

		case 0x2C: // Relative 2d cell reference reference, used in shared formulas and some other places
		case 0x4C:
		case 0x6C:
			$name = 'tRefN';
			$size = 5;
			$data = $this->_readBIFF8CellAddressB(substr($formulaData, 1, 4), $baseCell);
			break;

		case 0x2D:	//	Relative 2d range reference
		case 0x4D:
		case 0x6D:
			$name = 'tAreaN';
			$size = 9;
			$data = $this->_readBIFF8CellRangeAddressB(substr($formulaData, 1, 8), $baseCell);
			break;

		case 0x39:	//	External name
		case 0x59:
		case 0x79:
			$name = 'tNameX';
			$size = 7;
			// offset: 1; size: 2; index to REF entry in EXTERNSHEET record
			// offset: 3; size: 2; one-based index to DEFINEDNAME or EXTERNNAME record
			$index = self::_GetInt2d($formulaData, 3);
			// assume index is to EXTERNNAME record
			$data = $this->_externalNames[$index - 1]['name'];
			// offset: 5; size: 2; not used
			break;

		case 0x3A:	//	3d reference to cell
		case 0x5A:
		case 0x7A:
			$name = 'tRef3d';
			$size = 7;

			try {
				// offset: 1; size: 2; index to REF entry
				$sheetRange = $this->_readSheetRangeByRefIndex(self::_GetInt2d($formulaData, 1));
				// offset: 3; size: 4; cell address
				$cellAddress = $this->_readBIFF8CellAddress(substr($formulaData, 3, 4));

				$data = "$sheetRange!$cellAddress";
			} catch (Exception $e) {
				// deleted sheet reference
				$data = '#REF!';
			}

			break;
		case 0x3B:	//	3d reference to cell range
		case 0x5B:
		case 0x7B:
			$name = 'tArea3d';
			$size = 11;

			try {
				// offset: 1; size: 2; index to REF entry
				$sheetRange = $this->_readSheetRangeByRefIndex(self::_GetInt2d($formulaData, 1));
				// offset: 3; size: 8; cell address
				$cellRangeAddress = $this->_readBIFF8CellRangeAddress(substr($formulaData, 3, 8));

				$data = "$sheetRange!$cellRangeAddress";
			} catch (Exception $e) {
				// deleted sheet reference
				$data = '#REF!';
			}

			break;
		// Unknown cases	// don't know how to deal with
		default:
			throw new Exception('Unrecognized token ' . sprintf('%02X', $id) . ' in formula');
			break;
		}

		return array(
			'id' => $id,
			'name' => $name,
			'size' => $size,
			'data' => $data,
		);
	}

	/**
	 * Reads a cell address in BIFF8 e.g. 'A2' or '$A$2'
	 * section 3.3.4
	 *
	 * @param string $cellAddressStructure
	 * @return string
	 */
	private function _readBIFF8CellAddress($cellAddressStructure)
	{
		// offset: 0; size: 2; index to row (0... 65535) (or offset (-32768... 32767))
		$row = self::_GetInt2d($cellAddressStructure, 0) + 1;

		// offset: 2; size: 2; index to column or column offset + relative flags

			// bit: 7-0; mask 0x00FF; column index
			$column = PHPExcel_Cell::stringFromColumnIndex(0x00FF & self::_GetInt2d($cellAddressStructure, 2));

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($cellAddressStructure, 2))) {
				$column = '$' . $column;
			}
			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($cellAddressStructure, 2))) {
				$row = '$' . $row;
			}

		return $column . $row;
	}

	/**
	 * Reads a cell address in BIFF8 for shared formulas. Uses positive and negative values for row and column
	 * to indicate offsets from a base cell
	 * section 3.3.4
	 *
	 * @param string $cellAddressStructure
	 * @param string $baseCell Base cell, only needed when formula contains tRefN tokens, e.g. with shared formulas
	 * @return string
	 */
	private function _readBIFF8CellAddressB($cellAddressStructure, $baseCell = 'A1')
	{
		list($baseCol, $baseRow) = PHPExcel_Cell::coordinateFromString($baseCell);
		$baseCol = PHPExcel_Cell::columnIndexFromString($baseCol) - 1;

		// offset: 0; size: 2; index to row (0... 65535) (or offset (-32768... 32767))
			$rowIndex = self::_GetInt2d($cellAddressStructure, 0);
			$row = self::_GetInt2d($cellAddressStructure, 0) + 1;

		// offset: 2; size: 2; index to column or column offset + relative flags

			// bit: 7-0; mask 0x00FF; column index
			$colIndex = 0x00FF & self::_GetInt2d($cellAddressStructure, 2);

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($cellAddressStructure, 2))) {
				$column = PHPExcel_Cell::stringFromColumnIndex($colIndex);
				$column = '$' . $column;
			} else {
				$colIndex = ($colIndex <= 127) ? $colIndex : $colIndex - 256;
				$column = PHPExcel_Cell::stringFromColumnIndex($baseCol + $colIndex);
			}

			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($cellAddressStructure, 2))) {
				$row = '$' . $row;
			} else {
				$rowIndex = ($rowIndex <= 32767) ? $rowIndex : $rowIndex - 65536;
				$row = $baseRow + $rowIndex;
			}

		return $column . $row;
	}

	/**
	 * Reads a cell range address in BIFF5 e.g. 'A2:B6' or 'A1'
	 * always fixed range
	 * section 2.5.14
	 *
	 * @param string $subData
	 * @return string
	 * @throws Exception
	 */
	private function _readBIFF5CellRangeAddressFixed($subData)
	{
		// offset: 0; size: 2; index to first row
		$fr = self::_GetInt2d($subData, 0) + 1;

		// offset: 2; size: 2; index to last row
		$lr = self::_GetInt2d($subData, 2) + 1;

		// offset: 4; size: 1; index to first column
		$fc = ord($subData{4});

		// offset: 5; size: 1; index to last column
		$lc = ord($subData{5});

		// check values
		if ($fr > $lr || $fc > $lc) {
			throw new Exception('Not a cell range address');
		}

		// column index to letter
		$fc = PHPExcel_Cell::stringFromColumnIndex($fc);
		$lc = PHPExcel_Cell::stringFromColumnIndex($lc);

		if ($fr == $lr and $fc == $lc) {
			return "$fc$fr";
		}
		return "$fc$fr:$lc$lr";
	}

	/**
	 * Reads a cell range address in BIFF8 e.g. 'A2:B6' or 'A1'
	 * always fixed range
	 * section 2.5.14
	 *
	 * @param string $subData
	 * @return string
	 * @throws Exception
	 */
	private function _readBIFF8CellRangeAddressFixed($subData)
	{
		// offset: 0; size: 2; index to first row
		$fr = self::_GetInt2d($subData, 0) + 1;

		// offset: 2; size: 2; index to last row
		$lr = self::_GetInt2d($subData, 2) + 1;

		// offset: 4; size: 2; index to first column
		$fc = self::_GetInt2d($subData, 4);

		// offset: 6; size: 2; index to last column
		$lc = self::_GetInt2d($subData, 6);

		// check values
		if ($fr > $lr || $fc > $lc) {
			throw new Exception('Not a cell range address');
		}

		// column index to letter
		$fc = PHPExcel_Cell::stringFromColumnIndex($fc);
		$lc = PHPExcel_Cell::stringFromColumnIndex($lc);

		if ($fr == $lr and $fc == $lc) {
			return "$fc$fr";
		}
		return "$fc$fr:$lc$lr";
	}

	/**
	 * Reads a cell range address in BIFF8 e.g. 'A2:B6' or '$A$2:$B$6'
	 * there are flags indicating whether column/row index is relative
	 * section 3.3.4
	 *
	 * @param string $subData
	 * @return string
	 */
	private function _readBIFF8CellRangeAddress($subData)
	{
		// todo: if cell range is just a single cell, should this funciton
		// not just return e.g. 'A1' and not 'A1:A1' ?

		// offset: 0; size: 2; index to first row (0... 65535) (or offset (-32768... 32767))
			$fr = self::_GetInt2d($subData, 0) + 1;

		// offset: 2; size: 2; index to last row (0... 65535) (or offset (-32768... 32767))
			$lr = self::_GetInt2d($subData, 2) + 1;

		// offset: 4; size: 2; index to first column or column offset + relative flags

			// bit: 7-0; mask 0x00FF; column index
			$fc = PHPExcel_Cell::stringFromColumnIndex(0x00FF & self::_GetInt2d($subData, 4));

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($subData, 4))) {
				$fc = '$' . $fc;
			}

			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($subData, 4))) {
				$fr = '$' . $fr;
			}

		// offset: 6; size: 2; index to last column or column offset + relative flags

			// bit: 7-0; mask 0x00FF; column index
			$lc = PHPExcel_Cell::stringFromColumnIndex(0x00FF & self::_GetInt2d($subData, 6));

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($subData, 6))) {
				$lc = '$' . $lc;
			}

			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($subData, 6))) {
				$lr = '$' . $lr;
			}

		return "$fc$fr:$lc$lr";
	}

	/**
	 * Reads a cell range address in BIFF8 for shared formulas. Uses positive and negative values for row and column
	 * to indicate offsets from a base cell
	 * section 3.3.4
	 *
	 * @param string $subData
	 * @param string $baseCell Base cell
	 * @return string Cell range address
	 */
	private function _readBIFF8CellRangeAddressB($subData, $baseCell = 'A1')
	{
		list($baseCol, $baseRow) = PHPExcel_Cell::coordinateFromString($baseCell);
		$baseCol = PHPExcel_Cell::columnIndexFromString($baseCol) - 1;

		// TODO: if cell range is just a single cell, should this funciton
		// not just return e.g. 'A1' and not 'A1:A1' ?

		// offset: 0; size: 2; first row
		$frIndex = self::_GetInt2d($subData, 0); // adjust below

		// offset: 2; size: 2; relative index to first row (0... 65535) should be treated as offset (-32768... 32767)
		$lrIndex = self::_GetInt2d($subData, 2); // adjust below

		// offset: 4; size: 2; first column with relative/absolute flags

			// bit: 7-0; mask 0x00FF; column index
			$fcIndex = 0x00FF & self::_GetInt2d($subData, 4);

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($subData, 4))) {
				// absolute column index
				$fc = PHPExcel_Cell::stringFromColumnIndex($fcIndex);
				$fc = '$' . $fc;
			} else {
				// column offset
				$fcIndex = ($fcIndex <= 127) ? $fcIndex : $fcIndex - 256;
				$fc = PHPExcel_Cell::stringFromColumnIndex($baseCol + $fcIndex);
			}

			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($subData, 4))) {
				// absolute row index
				$fr = $frIndex + 1;
				$fr = '$' . $fr;
			} else {
				// row offset
				$frIndex = ($frIndex <= 32767) ? $frIndex : $frIndex - 65536;
				$fr = $baseRow + $frIndex;
			}

		// offset: 6; size: 2; last column with relative/absolute flags

			// bit: 7-0; mask 0x00FF; column index
			$lcIndex = 0x00FF & self::_GetInt2d($subData, 6);
			$lcIndex = ($lcIndex <= 127) ? $lcIndex : $lcIndex - 256;
			$lc = PHPExcel_Cell::stringFromColumnIndex($baseCol + $lcIndex);

			// bit: 14; mask 0x4000; (1 = relative column index, 0 = absolute column index)
			if (!(0x4000 & self::_GetInt2d($subData, 6))) {
				// absolute column index
				$lc = PHPExcel_Cell::stringFromColumnIndex($lcIndex);
				$lc = '$' . $lc;
			} else {
				// column offset
				$lcIndex = ($lcIndex <= 127) ? $lcIndex : $lcIndex - 256;
				$lc = PHPExcel_Cell::stringFromColumnIndex($baseCol + $lcIndex);
			}

			// bit: 15; mask 0x8000; (1 = relative row index, 0 = absolute row index)
			if (!(0x8000 & self::_GetInt2d($subData, 6))) {
				// absolute row index
				$lr = $lrIndex + 1;
				$lr = '$' . $lr;
			} else {
				// row offset
				$lrIndex = ($lrIndex <= 32767) ? $lrIndex : $lrIndex - 65536;
				$lr = $baseRow + $lrIndex;
			}

		return "$fc$fr:$lc$lr";
	}

	/**
	 * Read BIFF8 cell range address list
	 * section 2.5.15
	 *
	 * @param string $subData
	 * @return array
	 */
	private function _readBIFF8CellRangeAddressList($subData)
	{
		$cellRangeAddresses = array();

		// offset: 0; size: 2; number of the following cell range addresses
		$nm = self::_GetInt2d($subData, 0);

		$offset = 2;
		// offset: 2; size: 8 * $nm; list of $nm (fixed) cell range addresses
		for ($i = 0; $i < $nm; ++$i) {
			$cellRangeAddresses[] = $this->_readBIFF8CellRangeAddressFixed(substr($subData, $offset, 8));
			$offset += 8;
		}

		return array(
			'size' => 2 + 8 * $nm,
			'cellRangeAddresses' => $cellRangeAddresses,
		);
	}

	/**
	 * Read BIFF5 cell range address list
	 * section 2.5.15
	 *
	 * @param string $subData
	 * @return array
	 */
	private function _readBIFF5CellRangeAddressList($subData)
	{
		$cellRangeAddresses = array();

		// offset: 0; size: 2; number of the following cell range addresses
		$nm = self::_GetInt2d($subData, 0);

		$offset = 2;
		// offset: 2; size: 6 * $nm; list of $nm (fixed) cell range addresses
		for ($i = 0; $i < $nm; ++$i) {
			$cellRangeAddresses[] = $this->_readBIFF5CellRangeAddressFixed(substr($subData, $offset, 6));
			$offset += 6;
		}

		return array(
			'size' => 2 + 6 * $nm,
			'cellRangeAddresses' => $cellRangeAddresses,
		);
	}

	/**
	 * Get a sheet range like Sheet1:Sheet3 from REF index
	 * Note: If there is only one sheet in the range, one gets e.g Sheet1
	 * It can also happen that the REF structure uses the -1 (FFFF) code to indicate deleted sheets,
	 * in which case an exception is thrown
	 *
	 * @param int $index
	 * @return string|false
	 * @throws Exception
	 */
	private function _readSheetRangeByRefIndex($index)
	{
		if (isset($this->_ref[$index])) {

			$type = $this->_externalBooks[$this->_ref[$index]['externalBookIndex']]['type'];

			switch ($type) {
				case 'internal':
					// check if we have a deleted 3d reference
					if ($this->_ref[$index]['firstSheetIndex'] == 0xFFFF or $this->_ref[$index]['lastSheetIndex'] == 0xFFFF) {
						throw new Exception('Deleted sheet reference');
					}

					// we have normal sheet range (collapsed or uncollapsed)
					$firstSheetName = $this->_sheets[$this->_ref[$index]['firstSheetIndex']]['name'];
					$lastSheetName = $this->_sheets[$this->_ref[$index]['lastSheetIndex']]['name'];

					if ($firstSheetName == $lastSheetName) {
						// collapsed sheet range
						$sheetRange = $firstSheetName;
					} else {
						$sheetRange = "$firstSheetName:$lastSheetName";
					}

					// escape the single-quotes
					$sheetRange = str_replace("'", "''", $sheetRange);

					// if there are special characters, we need to enclose the range in single-quotes
					// todo: check if we have identified the whole set of special characters
					// it seems that the following characters are not accepted for sheet names
					// and we may assume that they are not present: []*/:\?
					if (preg_match("/[ !\"@#£$%&{()}<>=+'|^,;-]/", $sheetRange)) {
						$sheetRange = "'$sheetRange'";
					}

					return $sheetRange;
					break;

				default:
					// TODO: external sheet support
					throw new Exception('Excel5 reader only supports internal sheets in fomulas');
					break;
			}
		}
		return false;
	}

	/**
	 * read BIFF8 constant value array from array data
	 * returns e.g. array('value' => '{1,2;3,4}', 'size' => 40}
	 * section 2.5.8
	 *
	 * @param string $arrayData
	 * @return array
	 */
	private static function _readBIFF8ConstantArray($arrayData)
	{
		// offset: 0; size: 1; number of columns decreased by 1
		$nc = ord($arrayData[0]);

		// offset: 1; size: 2; number of rows decreased by 1
		$nr = self::_GetInt2d($arrayData, 1);
		$size = 3; // initialize
		$arrayData = substr($arrayData, 3);

		// offset: 3; size: var; list of ($nc + 1) * ($nr + 1) constant values
		$matrixChunks = array();
		for ($r = 1; $r <= $nr + 1; ++$r) {
			$items = array();
			for ($c = 1; $c <= $nc + 1; ++$c) {
				$constant = self::_readBIFF8Constant($arrayData);
				$items[] = $constant['value'];
				$arrayData = substr($arrayData, $constant['size']);
				$size += $constant['size'];
			}
			$matrixChunks[] = implode(',', $items); // looks like e.g. '1,"hello"'
		}
		$matrix = '{' . implode(';', $matrixChunks) . '}';

		return array(
			'value' => $matrix,
			'size' => $size,
		);
	}

	/**
	 * read BIFF8 constant value which may be 'Empty Value', 'Number', 'String Value', 'Boolean Value', 'Error Value'
	 * section 2.5.7
	 * returns e.g. array('value' => '5', 'size' => 9)
	 *
	 * @param string $valueData
	 * @return array
	 */
	private static function _readBIFF8Constant($valueData)
	{
		// offset: 0; size: 1; identifier for type of constant
		$identifier = ord($valueData[0]);

		switch ($identifier) {
		case 0x00: // empty constant (what is this?)
			$value = '';
			$size = 9;
			break;
		case 0x01: // number
			// offset: 1; size: 8; IEEE 754 floating-point value
			$value = self::_extractNumber(substr($valueData, 1, 8));
			$size = 9;
			break;
		case 0x02: // string value
			// offset: 1; size: var; Unicode string, 16-bit string length
			$string = self::_readUnicodeStringLong(substr($valueData, 1));
			$value = '"' . $string['value'] . '"';
			$size = 1 + $string['size'];
			break;
		case 0x04: // boolean
			// offset: 1; size: 1; 0 = FALSE, 1 = TRUE
			if (ord($valueData[1])) {
				$value = 'TRUE';
			} else {
				$value = 'FALSE';
			}
			$size = 9;
			break;
		case 0x10: // error code
			// offset: 1; size: 1; error code
			$value = self::_mapErrorCode(ord($valueData[1]));
			$size = 9;
			break;
		}
		return array(
			'value' => $value,
			'size' => $size,
		);
	}

	/**
	 * Extract RGB color
	 * OpenOffice.org's Documentation of the Microsoft Excel File Format, section 2.5.4
	 *
	 * @param string $rgb Encoded RGB value (4 bytes)
	 * @return array
	 */
	private static function _readRGB($rgb)
	{
		// offset: 0; size 1; Red component
		$r = ord($rgb{0});

		// offset: 1; size: 1; Green component
		$g = ord($rgb{1});

		// offset: 2; size: 1; Blue component
		$b = ord($rgb{2});

		// HEX notation, e.g. 'FF00FC'
		$rgb = sprintf('%02X%02X%02X', $r, $g, $b);

		return array('rgb' => $rgb);
	}

	/**
	 * Read byte string (8-bit string length)
	 * OpenOffice documentation: 2.5.2
	 *
	 * @param string $subData
	 * @return array
	 */
	private function _readByteStringShort($subData)
	{
		// offset: 0; size: 1; length of the string (character count)
		$ln = ord($subData[0]);

		// offset: 1: size: var; character array (8-bit characters)
		$value = $this->_decodeCodepage(substr($subData, 1, $ln));

		return array(
			'value' => $value,
			'size' => 1 + $ln, // size in bytes of data structure
		);
	}

	/**
	 * Read byte string (16-bit string length)
	 * OpenOffice documentation: 2.5.2
	 *
	 * @param string $subData
	 * @return array
	 */
	private function _readByteStringLong($subData)
	{
		// offset: 0; size: 2; length of the string (character count)
		$ln = self::_GetInt2d($subData, 0);

		// offset: 2: size: var; character array (8-bit characters)
		$value = $this->_decodeCodepage(substr($subData, 2));

		//return $string;
		return array(
			'value' => $value,
			'size' => 2 + $ln, // size in bytes of data structure
		);
	}

	/**
	 * Extracts an Excel Unicode short string (8-bit string length)
	 * OpenOffice documentation: 2.5.3
	 * function will automatically find out where the Unicode string ends.
	 *
	 * @param string $subData
	 * @return array
	 */
	private static function _readUnicodeStringShort($subData)
	{
		$value = '';

		// offset: 0: size: 1; length of the string (character count)
		$characterCount = ord($subData[0]);

		$string = self::_readUnicodeString(substr($subData, 1), $characterCount);

		// add 1 for the string length
		$string['size'] += 1;

		return $string;
	}

	/**
	 * Extracts an Excel Unicode long string (16-bit string length)
	 * OpenOffice documentation: 2.5.3
	 * this function is under construction, needs to support rich text, and Asian phonetic settings
	 *
	 * @param string $subData
	 * @return array
	 */
	private static function _readUnicodeStringLong($subData)
	{
		$value = '';

		// offset: 0: size: 2; length of the string (character count)
		$characterCount = self::_GetInt2d($subData, 0);

		$string = self::_readUnicodeString(substr($subData, 2), $characterCount);

		// add 2 for the string length
		$string['size'] += 2;

		return $string;
	}

	/**
	 * Read Unicode string with no string length field, but with known character count
	 * this function is under construction, needs to support rich text, and Asian phonetic settings
	 * OpenOffice.org's Documentation of the Microsoft Excel File Format, section 2.5.3
	 *
	 * @param string $subData
	 * @param int $characterCount
	 * @return array
	 */
	private static function _readUnicodeString($subData, $characterCount)
	{
		$value = '';

		// offset: 0: size: 1; option flags

			// bit: 0; mask: 0x01; character compression (0 = compressed 8-bit, 1 = uncompressed 16-bit)
			$isCompressed = !((0x01 & ord($subData[0])) >> 0);

			// bit: 2; mask: 0x04; Asian phonetic settings
			$hasAsian = (0x04) & ord($subData[0]) >> 2;

			// bit: 3; mask: 0x08; Rich-Text settings
			$hasRichText = (0x08) & ord($subData[0]) >> 3;

		// offset: 1: size: var; character array
		// this offset assumes richtext and Asian phonetic settings are off which is generally wrong
		// needs to be fixed
		$value = self::_encodeUTF16(substr($subData, 1, $isCompressed ? $characterCount : 2 * $characterCount), $isCompressed);

		return array(
			'value' => $value,
			'size' => $isCompressed ? 1 + $characterCount : 1 + 2 * $characterCount, // the size in bytes including the option flags
		);
	}

	/**
	 * Convert UTF-8 string to string surounded by double quotes. Used for explicit string tokens in formulas.
	 * Example:  hello"world  -->  "hello""world"
	 *
	 * @param string $value UTF-8 encoded string
	 * @return string
	 */
	private static function _UTF8toExcelDoubleQuoted($value)
	{
		return '"' . str_replace('"', '""', $value) . '"';
	}

	/**
	 * Reads first 8 bytes of a string and return IEEE 754 float
	 *
	 * @param string $data Binary string that is at least 8 bytes long
	 * @return float
	 */
	private static function _extractNumber($data)
	{
		$rknumhigh = self::_GetInt4d($data, 4);
		$rknumlow = self::_GetInt4d($data, 0);
		$sign = ($rknumhigh & 0x80000000) >> 31;
		$exp = (($rknumhigh & 0x7ff00000) >> 20) - 1023;
		$mantissa = (0x100000 | ($rknumhigh & 0x000fffff));
		$mantissalow1 = ($rknumlow & 0x80000000) >> 31;
		$mantissalow2 = ($rknumlow & 0x7fffffff);
		$value = $mantissa / pow( 2 , (20 - $exp));

		if ($mantissalow1 != 0) {
			$value += 1 / pow (2 , (21 - $exp));
		}

		$value += $mantissalow2 / pow (2 , (52 - $exp));
		if ($sign) {
			$value = -1 * $value;
		}

		return $value;
	}

	private static function _GetIEEE754($rknum)
	{
		if (($rknum & 0x02) != 0) {
			$value = $rknum >> 2;
		}
		else {
			// changes by mmp, info on IEEE754 encoding from
			// research.microsoft.com/~hollasch/cgindex/coding/ieeefloat.html
			// The RK format calls for using only the most significant 30 bits
			// of the 64 bit floating point value. The other 34 bits are assumed
			// to be 0 so we use the upper 30 bits of $rknum as follows...
			$sign = ($rknum & 0x80000000) >> 31;
			$exp = ($rknum & 0x7ff00000) >> 20;
			$mantissa = (0x100000 | ($rknum & 0x000ffffc));
			$value = $mantissa / pow( 2 , (20- ($exp - 1023)));
			if ($sign) {
				$value = -1 * $value;
			}
			//end of changes by mmp
		}
		if (($rknum & 0x01) != 0) {
			$value /= 100;
		}
		return $value;
	}

	/**
	 * Get UTF-8 string from (compressed or uncompressed) UTF-16 string
	 *
	 * @param string $string
	 * @param bool $compressed
	 * @return string
	 */
	private static function _encodeUTF16($string, $compressed = '')
	{
		if ($compressed) {
			$string = self::_uncompressByteString($string);
 		}

		return PHPExcel_Shared_String::ConvertEncoding($string, 'UTF-8', 'UTF-16LE');
	}

	/**
	 * Convert UTF-16 string in compressed notation to uncompressed form. Only used for BIFF8.
	 *
	 * @param string $string
	 * @return string
	 */
	private static function _uncompressByteString($string)
	{
		$uncompressedString = '';
		$strLen = strlen($string);
		for ($i = 0; $i < $strLen; ++$i) {
			$uncompressedString .= $string[$i] . "\0";
		}

		return $uncompressedString;
	}

	/**
	 * Convert string to UTF-8. Only used for BIFF5.
	 *
	 * @param string $string
	 * @return string
	 */
	private function _decodeCodepage($string)
	{
		return PHPExcel_Shared_String::ConvertEncoding($string, 'UTF-8', $this->_codepage);
	}

	/**
	 * Read 16-bit unsigned integer
	 *
	 * @param string $data
	 * @param int $pos
	 * @return int
	 */
	public static function _GetInt2d($data, $pos)
	{
		return ord($data[$pos]) | (ord($data[$pos + 1]) << 8);
	}

	/**
	 * Read 32-bit signed integer
	 *
	 * @param string $data
	 * @param int $pos
	 * @return int
	 */
	public static function _GetInt4d($data, $pos)
	{
		// FIX: represent numbers correctly on 64-bit system
		// http://sourceforge.net/tracker/index.php?func=detail&aid=1487372&group_id=99160&atid=623334
		// Hacked by Andreas Rehm 2006 to ensure correct result of the <<24 block on 32 and 64bit systems
		$_or_24 = ord($data[$pos + 3]);
		if ($_or_24 >= 128) {
			// negative number
			$_ord_24 = -abs((256 - $_or_24) << 24);
		} else {
			$_ord_24 = ($_or_24 & 127) << 24;
		}
		return ord($data[$pos]) | (ord($data[$pos + 1]) << 8) | (ord($data[$pos + 2]) << 16) | $_ord_24;
	}

	/**
	 * Read color
	 *
	 * @param int $color Indexed color
	 * @param array $palette Color palette
	 * @return array RGB color value, example: array('rgb' => 'FF0000')
	 */
	private static function _readColor($color,$palette,$version)
	{
		if ($color <= 0x07 || $color >= 0x40) {
			// special built-in color
			return self::_mapBuiltInColor($color);
		} elseif (isset($palette) && isset($palette[$color - 8])) {
			// palette color, color index 0x08 maps to pallete index 0
			return $palette[$color - 8];
		} else {
			// default color table
			if ($version == self::XLS_BIFF8) {
				return self::_mapColor($color);
			} else {
				// BIFF5
				return self::_mapColorBIFF5($color);
			}
		}

		return $color;
	}


	/**
	 * Map border style
	 * OpenOffice documentation: 2.5.11
	 *
	 * @param int $index
	 * @return string
	 */
	private static function _mapBorderStyle($index)
	{
		switch ($index) {
			case 0x00: return PHPExcel_Style_Border::BORDER_NONE;
			case 0x01: return PHPExcel_Style_Border::BORDER_THIN;
			case 0x02: return PHPExcel_Style_Border::BORDER_MEDIUM;
			case 0x03: return PHPExcel_Style_Border::BORDER_DASHED;
			case 0x04: return PHPExcel_Style_Border::BORDER_DOTTED;
			case 0x05: return PHPExcel_Style_Border::BORDER_THICK;
			case 0x06: return PHPExcel_Style_Border::BORDER_DOUBLE;
			case 0x07: return PHPExcel_Style_Border::BORDER_HAIR;
			case 0x08: return PHPExcel_Style_Border::BORDER_MEDIUMDASHED;
			case 0x09: return PHPExcel_Style_Border::BORDER_DASHDOT;
			case 0x0A: return PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT;
			case 0x0B: return PHPExcel_Style_Border::BORDER_DASHDOTDOT;
			case 0x0C: return PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT;
			case 0x0D: return PHPExcel_Style_Border::BORDER_SLANTDASHDOT;
			default:   return PHPExcel_Style_Border::BORDER_NONE;
		}
	}

	/**
	 * Get fill pattern from index
	 * OpenOffice documentation: 2.5.12
	 *
	 * @param int $index
	 * @return string
	 */
	private static function _mapFillPattern($index)
	{
		switch ($index) {
			case 0x00: return PHPExcel_Style_Fill::FILL_NONE;
			case 0x01: return PHPExcel_Style_Fill::FILL_SOLID;
			case 0x02: return PHPExcel_Style_Fill::FILL_PATTERN_MEDIUMGRAY;
			case 0x03: return PHPExcel_Style_Fill::FILL_PATTERN_DARKGRAY;
			case 0x04: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTGRAY;
			case 0x05: return PHPExcel_Style_Fill::FILL_PATTERN_DARKHORIZONTAL;
			case 0x06: return PHPExcel_Style_Fill::FILL_PATTERN_DARKVERTICAL;
			case 0x07: return PHPExcel_Style_Fill::FILL_PATTERN_DARKDOWN;
			case 0x08: return PHPExcel_Style_Fill::FILL_PATTERN_DARKUP;
			case 0x09: return PHPExcel_Style_Fill::FILL_PATTERN_DARKGRID;
			case 0x0A: return PHPExcel_Style_Fill::FILL_PATTERN_DARKTRELLIS;
			case 0x0B: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTHORIZONTAL;
			case 0x0C: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTVERTICAL;
			case 0x0D: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTDOWN;
			case 0x0E: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTUP;
			case 0x0F: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTGRID;
			case 0x10: return PHPExcel_Style_Fill::FILL_PATTERN_LIGHTTRELLIS;
			case 0x11: return PHPExcel_Style_Fill::FILL_PATTERN_GRAY125;
			case 0x12: return PHPExcel_Style_Fill::FILL_PATTERN_GRAY0625;
			default:   return PHPExcel_Style_Fill::FILL_NONE;
		}
	}

	/**
	 * Map error code, e.g. '#N/A'
	 *
	 * @param int $subData
	 * @return string
	 */
	private static function _mapErrorCode($subData)
	{
		switch ($subData) {
			case 0x00: return '#NULL!';		break;
			case 0x07: return '#DIV/0!';	break;
			case 0x0F: return '#VALUE!';	break;
			case 0x17: return '#REF!';		break;
			case 0x1D: return '#NAME?';		break;
			case 0x24: return '#NUM!';		break;
			case 0x2A: return '#N/A';		break;
			default: return false;
		}
	}

	/**
	 * Map built-in color to RGB value
	 *
	 * @param int $color Indexed color
	 * @return array
	 */
	private static function _mapBuiltInColor($color)
	{
		switch ($color) {
			case 0x00: return array('rgb' => '000000');
			case 0x01: return array('rgb' => 'FFFFFF');
			case 0x02: return array('rgb' => 'FF0000');
			case 0x03: return array('rgb' => '00FF00');
			case 0x04: return array('rgb' => '0000FF');
			case 0x05: return array('rgb' => 'FFFF00');
			case 0x06: return array('rgb' => 'FF00FF');
			case 0x07: return array('rgb' => '00FFFF');
			case 0x40: return array('rgb' => '000000'); // system window text color
			case 0x41: return array('rgb' => 'FFFFFF'); // system window background color
			default:   return array('rgb' => '000000');
		}
	}

	/**
	 * Map color array from BIFF5 built-in color index
	 *
	 * @param int $subData
	 * @return array
	 */
	private static function _mapColorBIFF5($subData)
	{
		switch ($subData) {
			case 0x08: return array('rgb' => '000000');
			case 0x09: return array('rgb' => 'FFFFFF');
			case 0x0A: return array('rgb' => 'FF0000');
			case 0x0B: return array('rgb' => '00FF00');
			case 0x0C: return array('rgb' => '0000FF');
			case 0x0D: return array('rgb' => 'FFFF00');
			case 0x0E: return array('rgb' => 'FF00FF');
			case 0x0F: return array('rgb' => '00FFFF');
			case 0x10: return array('rgb' => '800000');
			case 0x11: return array('rgb' => '008000');
			case 0x12: return array('rgb' => '000080');
			case 0x13: return array('rgb' => '808000');
			case 0x14: return array('rgb' => '800080');
			case 0x15: return array('rgb' => '008080');
			case 0x16: return array('rgb' => 'C0C0C0');
			case 0x17: return array('rgb' => '808080');
			case 0x18: return array('rgb' => '8080FF');
			case 0x19: return array('rgb' => '802060');
			case 0x1A: return array('rgb' => 'FFFFC0');
			case 0x1B: return array('rgb' => 'A0E0F0');
			case 0x1C: return array('rgb' => '600080');
			case 0x1D: return array('rgb' => 'FF8080');
			case 0x1E: return array('rgb' => '0080C0');
			case 0x1F: return array('rgb' => 'C0C0FF');
			case 0x20: return array('rgb' => '000080');
			case 0x21: return array('rgb' => 'FF00FF');
			case 0x22: return array('rgb' => 'FFFF00');
			case 0x23: return array('rgb' => '00FFFF');
			case 0x24: return array('rgb' => '800080');
			case 0x25: return array('rgb' => '800000');
			case 0x26: return array('rgb' => '008080');
			case 0x27: return array('rgb' => '0000FF');
			case 0x28: return array('rgb' => '00CFFF');
			case 0x29: return array('rgb' => '69FFFF');
			case 0x2A: return array('rgb' => 'E0FFE0');
			case 0x2B: return array('rgb' => 'FFFF80');
			case 0x2C: return array('rgb' => 'A6CAF0');
			case 0x2D: return array('rgb' => 'DD9CB3');
			case 0x2E: return array('rgb' => 'B38FEE');
			case 0x2F: return array('rgb' => 'E3E3E3');
			case 0x30: return array('rgb' => '2A6FF9');
			case 0x31: return array('rgb' => '3FB8CD');
			case 0x32: return array('rgb' => '488436');
			case 0x33: return array('rgb' => '958C41');
			case 0x34: return array('rgb' => '8E5E42');
			case 0x35: return array('rgb' => 'A0627A');
			case 0x36: return array('rgb' => '624FAC');
			case 0x37: return array('rgb' => '969696');
			case 0x38: return array('rgb' => '1D2FBE');
			case 0x39: return array('rgb' => '286676');
			case 0x3A: return array('rgb' => '004500');
			case 0x3B: return array('rgb' => '453E01');
			case 0x3C: return array('rgb' => '6A2813');
			case 0x3D: return array('rgb' => '85396A');
			case 0x3E: return array('rgb' => '4A3285');
			case 0x3F: return array('rgb' => '424242');
			default:   return array('rgb' => '000000');
		}
	}

	/**
	 * Map color array from BIFF8 built-in color index
	 *
	 * @param int $subData
	 * @return array
	 */
	private static function _mapColor($subData)
	{
		switch ($subData) {
			case 0x08: return array('rgb' => '000000');
			case 0x09: return array('rgb' => 'FFFFFF');
			case 0x0A: return array('rgb' => 'FF0000');
			case 0x0B: return array('rgb' => '00FF00');
			case 0x0C: return array('rgb' => '0000FF');
			case 0x0D: return array('rgb' => 'FFFF00');
			case 0x0E: return array('rgb' => 'FF00FF');
			case 0x0F: return array('rgb' => '00FFFF');
			case 0x10: return array('rgb' => '800000');
			case 0x11: return array('rgb' => '008000');
			case 0x12: return array('rgb' => '000080');
			case 0x13: return array('rgb' => '808000');
			case 0x14: return array('rgb' => '800080');
			case 0x15: return array('rgb' => '008080');
			case 0x16: return array('rgb' => 'C0C0C0');
			case 0x17: return array('rgb' => '808080');
			case 0x18: return array('rgb' => '9999FF');
			case 0x19: return array('rgb' => '993366');
			case 0x1A: return array('rgb' => 'FFFFCC');
			case 0x1B: return array('rgb' => 'CCFFFF');
			case 0x1C: return array('rgb' => '660066');
			case 0x1D: return array('rgb' => 'FF8080');
			case 0x1E: return array('rgb' => '0066CC');
			case 0x1F: return array('rgb' => 'CCCCFF');
			case 0x20: return array('rgb' => '000080');
			case 0x21: return array('rgb' => 'FF00FF');
			case 0x22: return array('rgb' => 'FFFF00');
			case 0x23: return array('rgb' => '00FFFF');
			case 0x24: return array('rgb' => '800080');
			case 0x25: return array('rgb' => '800000');
			case 0x26: return array('rgb' => '008080');
			case 0x27: return array('rgb' => '0000FF');
			case 0x28: return array('rgb' => '00CCFF');
			case 0x29: return array('rgb' => 'CCFFFF');
			case 0x2A: return array('rgb' => 'CCFFCC');
			case 0x2B: return array('rgb' => 'FFFF99');
			case 0x2C: return array('rgb' => '99CCFF');
			case 0x2D: return array('rgb' => 'FF99CC');
			case 0x2E: return array('rgb' => 'CC99FF');
			case 0x2F: return array('rgb' => 'FFCC99');
			case 0x30: return array('rgb' => '3366FF');
			case 0x31: return array('rgb' => '33CCCC');
			case 0x32: return array('rgb' => '99CC00');
			case 0x33: return array('rgb' => 'FFCC00');
			case 0x34: return array('rgb' => 'FF9900');
			case 0x35: return array('rgb' => 'FF6600');
			case 0x36: return array('rgb' => '666699');
			case 0x37: return array('rgb' => '969696');
			case 0x38: return array('rgb' => '003366');
			case 0x39: return array('rgb' => '339966');
			case 0x3A: return array('rgb' => '003300');
			case 0x3B: return array('rgb' => '333300');
			case 0x3C: return array('rgb' => '993300');
			case 0x3D: return array('rgb' => '993366');
			case 0x3E: return array('rgb' => '333399');
			case 0x3F: return array('rgb' => '333333');
			default:   return array('rgb' => '000000');
		}
	}

}