<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2009 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.1, 2009-11-02
 */

// Original file header of PEAR::Spreadsheet_Excel_Writer_Worksheet (used as the base for this class):
// -----------------------------------------------------------------------------------------
// /*
// *  Module written/ported by Xavier Noguer <xnoguer@rezebra.com>
// *
// *  The majority of this is _NOT_ my code.  I simply ported it from the
// *  PERL Spreadsheet::WriteExcel module.
// *
// *  The author of the Spreadsheet::WriteExcel module is John McNamara 
// *  <jmcnamara@cpan.org>
// *
// *  I _DO_ maintain this code, and John McNamara has nothing to do with the
// *  porting of this code to PHP.  Any questions directly related to this
// *  class library should be directed to me.
// *
// *  License Information:
// *
// *    Spreadsheet_Excel_Writer:  A library for generating Excel Spreadsheets
// *    Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com
// *
// *    This library is free software; you can redistribute it and/or
// *    modify it under the terms of the GNU Lesser General Public
// *    License as published by the Free Software Foundation; either
// *    version 2.1 of the License, or (at your option) any later version.
// *
// *    This library is distributed in the hope that it will be useful,
// *    but WITHOUT ANY WARRANTY; without even the implied warranty of
// *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// *    Lesser General Public License for more details.
// *
// *    You should have received a copy of the GNU Lesser General Public
// *    License along with this library; if not, write to the Free Software
// *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// */


/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
	/**
	 * @ignore
	 */
	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../../');
}

/** PHPExcel_Writer_Excel5_Parser.php */
require_once PHPEXCEL_ROOT . 'PHPExcel/Writer/Excel5/Parser.php';

/** PHPExcel_Writer_Excel5_BIFFwriter.php */
require_once PHPEXCEL_ROOT . 'PHPExcel/Writer/Excel5/BIFFwriter.php';

/** PHPExcel_Writer_Excel5_Escher */
require_once PHPEXCEL_ROOT . 'PHPExcel/Writer/Excel5/Escher.php';

/** PHPExcel_RichText */
require_once PHPEXCEL_ROOT . 'PHPExcel/RichText.php';

/** PHPExcel_Shared_Font */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Font.php';

/** PHPExcel_Shared_String */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/String.php';

/** PHPExcel_Shared_Excel5 */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Excel5.php';

/** PHPExcel_Shared_Escher */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Escher.php';

/** PHPExcel_Shared_Escher_DgContainer */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Escher/DgContainer.php';

/** PHPExcel_Shared_Escher_DgContainer_SpgrContainer */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Escher/DgContainer/SpgrContainer.php';

/** PHPExcel_Shared_Escher_DgContainer_SpgrContainer_SpContainer */
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/Escher/DgContainer/SpgrContainer/SpContainer.php';


/**
 * PHPExcel_Writer_Excel5_Worksheet
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
{
	/**
	 * Formula parser
	 *
	 * @var PHPExcel_Writer_Excel5_Parser
	 */
	private $_parser;

	/**
	 * Filehandle to the temporary file for storing data
	 * @var resource
	 */
	var $_filehandle;

	/**
	 * Boolean indicating if we are using a temporary file for storing data
	 * @var bool
	 */
	var $_using_tmpfile;

	/**
	 * Maximum number of characters for a string (LABEL record in BIFF5)
	 * @var integer
	 */
	var $_xls_strmax;

	/**
	 * Array containing format information for columns
	 * @var array
	 */
	var $_colinfo;

	/**
	 * Array containing the selected area for the worksheet
	 * @var array
	 */
	var $_selection;

	/**
	 * The active pane for the worksheet
	 * @var integer
	 */
	var $_active_pane;

	/**
	 * Whether to use outline.
	 * @var integer
	 */
	var $_outline_on;

	/**
	 * Auto outline styles.
	 * @var bool
	 */
	var $_outline_style;

	/**
	 * Whether to have outline summary below.
	 * @var bool
	 */
	var $_outline_below;

	/**
	 * Whether to have outline summary at the right.
	 * @var bool
	 */
	var $_outline_right;

	/**
	 * Reference to the total number of strings in the workbook
	 * @var integer
	 */
	var $_str_total;

	/**
	 * Reference to the number of unique strings in the workbook
	 * @var integer
	 */
	var $_str_unique;

	/**
	 * Reference to the array containing all the unique strings in the workbook
	 * @var array
	 */
	var $_str_table;

	/**
	 * Color cache
	 */
	private $_colors;

	/**
	 * The temporary dir for storing files
	 * @var string
	 */
	var $_tmp_dir;

	/**
	 * List of temporary files created
	 * @var array
	 */
	var $_tempFilesCreated = array();

	/**
	 * Index of first used row (at least 0)
	 * @var int
	 */
	private $_firstRowIndex;

	/**
	 * Index of last used row. (no used rows means -1)
	 * @var int
	 */
	private $_lastRowIndex;

	/**
	 * Index of first used column (at least 0)
	 * @var int
	 */
	private $_firstColumnIndex;

	/**
	 * Index of last used column (no used columns means -1)
	 * @var int
	 */
	private $_lastColumnIndex;

	/**
	 * Sheet object
	 * @var PHPExcel_Worksheet
	 */
	private $_phpSheet;

	/**
	 * Count cell style Xfs
	 *
	 * @var int
	 */
	private $_countCellStyleXfs;

	/**
	 * Constructor
	 *
	 * @param int  $BIFF_version		 BIFF version
	 * @param int  $str_total		Total number of strings
	 * @param int  $str_unique		Total number of unique strings
	 * @param array  $str_table
	 * @param mixed   $parser	  The formula parser created for the Workbook
	 * @param string   $tempDir	  The temporary directory to be used
	 * @param PHPExcel_Worksheet $phpSheet
	 */
	public function __construct($BIFF_version,
												&$str_total,
												&$str_unique, &$str_table, &$colors,
												$parser, $tempDir = '', $phpSheet)
	{
		// It needs to call its parent's constructor explicitly
		parent::__construct();

		$this->_BIFF_version	= $BIFF_version;
		if ($BIFF_version == 0x0600) {
			// change BIFFwriter limit for CONTINUE records
			$this->_limit = 8224;
		}


		$this->_str_total		= &$str_total;
		$this->_str_unique		= &$str_unique;
		$this->_str_table		= &$str_table;
		$this->_colors			= &$colors;
		$this->_parser			= $parser;
		
		$this->_phpSheet = $phpSheet;

		//$this->ext_sheets		= array();
		$this->_filehandle		= '';
		$this->_using_tmpfile	= true;
		//$this->fileclosed		= 0;
		//$this->offset			= 0;
		$this->_xls_strmax		= 255;
		$this->_colinfo			= array();
		$this->_selection		= array(0,0,0,0);
		$this->_active_pane		= 3;

		$this->_print_headers		= 0;

		$this->_outline_style		= 0;
		$this->_outline_below		= 1;
		$this->_outline_right		= 1;
		$this->_outline_on			= 1;

		$this->_dv				= array();

		$this->_tmp_dir			= $tempDir;

		// calculate values for DIMENSIONS record
		$this->_firstRowIndex    =  0;
		$this->_lastRowIndex     = -1;
		$this->_firstColumnIndex =  0;
		$this->_lastColumnIndex  = -1;

		foreach ($this->_phpSheet->getCellCollection(false) as $cell) {
			$row = $cell->getRow() - 1;
			$column = PHPExcel_Cell::columnIndexFromString($cell->getColumn()) - 1;

			// Don't break Excel!
			if ($row + 1 > 65536 or $column + 1 > 256) {
				break;
			}

			$this->_firstRowIndex    = min($this->_firstRowIndex, $row);
			$this->_lastRowIndex     = max($this->_lastRowIndex, $row);
			$this->_firstColumnIndex = min($this->_firstColumnIndex, $column);
			$this->_lastColumnIndex  = max($this->_lastColumnIndex, $column);
		}

		$this->_initialize();
		$this->_countCellStyleXfs = count($phpSheet->getParent()->getCellStyleXfCollection());
	}

	/**
	 * Cleanup
	 */
	public function cleanup() {
		@fclose($this->_filehandle);

		foreach ($this->_tempFilesCreated as $file) {
			@unlink($file);
		}
	}

	/**
	 * Open a tmp file to store the majority of the Worksheet data. If this fails,
	 * for example due to write permissions, store the data in memory. This can be
	 * slow for large files.
	 *
	 * @access private
	 */
	function _initialize()
	{
		// Open tmp file for storing Worksheet data
		$fileName = tempnam($this->_tmp_dir, 'XLSHEET');
		$fh = fopen($fileName, 'w+');
		if ($fh) {
			// Store filehandle
			$this->_filehandle = $fh;
			$this->_tempFilesCreated[] = $fileName;
		} else {
			// If tmpfile() fails store data in memory
			$this->_using_tmpfile = false;
		}
	}

	/**
	 * Add data to the beginning of the workbook (note the reverse order)
	 * and to the end of the workbook.
	 *
	 * @access public
	 * @see PHPExcel_Writer_Excel5_Workbook::storeWorkbook()
	 */
	function close()
	{
		$num_sheets = count($this->_phpSheet->getParent()->getAllSheets());

		// Write BOF record
		$this->_storeBof(0x0010);

		// Write DEFCOLWIDTH record
		$this->_storeDefcol();

		// Calculate column widths
		$this->_phpSheet->calculateColumnWidths();

		// Column dimensions
		$columnDimensions = $this->_phpSheet->getColumnDimensions();
		for ($i = 0; $i < 256; ++$i) {
			$hidden = 0;
			$level = 0;
			$xfIndex = 15; // there are 15 cell style Xfs

			if ($this->_phpSheet->getDefaultColumnDimension()->getWidth() >= 0) {
				$width = $this->_phpSheet->getDefaultColumnDimension()->getWidth();
			} else {
				$width = PHPExcel_Shared_Font::getDefaultColumnWidthByFont($this->_phpSheet->getParent()->getDefaultStyle()->getFont());
			}

			$columnLetter = PHPExcel_Cell::stringFromColumnIndex($i);
			if (isset($columnDimensions[$columnLetter])) {
				$columnDimension = $columnDimensions[$columnLetter];
				if ($columnDimension->getWidth() >= 0) {
					$width = $columnDimension->getWidth();
				}
				$hidden = $columnDimension->getVisible() ? 0 : 1;
				$level = $columnDimension->getOutlineLevel();
				$xfIndex = $columnDimension->getXfIndex() + 15; // there are 15 cell style Xfs
			}

			$this->_setColumn( $i, $i, $width, $xfIndex, $hidden, $level);
		}

		// Write the COLINFO records if they exist
		if (!empty($this->_colinfo)) {
			$colcount = count($this->_colinfo);
			for ($i = 0; $i < $colcount; ++$i) {
				$this->_storeColinfo($this->_colinfo[$i]);
			}
		}

		// Write EXTERNCOUNT of external references
		if ($this->_BIFF_version == 0x0500) {
			$this->_storeExterncount($num_sheets);
		}

		// Write EXTERNSHEET references
		if ($this->_BIFF_version == 0x0500) {
			for ($i = 0; $i < $num_sheets; ++$i) {
				$this->_storeExternsheet($this->_phpSheet->getParent()->getSheet($i)->getTitle());
			}
		}

		// Write PRINTHEADERS
		$this->_storePrintHeaders();

		// Write PRINTGRIDLINES
		$this->_storePrintGridlines();

		// Write GUTS
		$this->_storeGuts();

		// Write GRIDSET
		$this->_storeGridset();

		// Write DEFAULTROWHEIGHT
		if ($this->_BIFF_version == 0x0600) {
			$this->_storeDefaultRowHeight();
		}

		// Write WSBOOL
		$this->_storeWsbool();

		// Write horizontal and vertical page breaks
		$this->_storeBreaks();

		// Write page header
		$this->_storeHeader();

		// Write page footer
		$this->_storeFooter();

		// Write page horizontal centering
		$this->_storeHcenter();

		// Write page vertical centering
		$this->_storeVcenter();

		// Write left margin
		$this->_storeMarginLeft();

		// Write right margin
		$this->_storeMarginRight();

		// Write top margin
		$this->_storeMarginTop();

		// Write bottom margin
		$this->_storeMarginBottom();

		// Write page setup
		$this->_storeSetup();

		// Write sheet protection
		$this->_storeProtect();

		// Write sheet password
		$this->_storePassword();

		// Write sheet dimensions
		$this->_storeDimensions();

		// Row dimensions
		foreach ($this->_phpSheet->getRowDimensions() as $rowDimension) {
			$xfIndex = $rowDimension->getXfIndex() + 15; // there are 15 cellXfs
			$this->_setRow( $rowDimension->getRowIndex() - 1, $rowDimension->getRowHeight(), $xfIndex, ($rowDimension->getVisible() ? '0' : '1'), $rowDimension->getOutlineLevel() );
		}

		// Write Cells
		foreach ($this->_phpSheet->getCellCollection() as $cell) {
			$row = $cell->getRow() - 1;
			$column = PHPExcel_Cell::columnIndexFromString($cell->getColumn()) - 1;

			// Don't break Excel!
			if ($row + 1 > 65536 or $column + 1 > 256) {
				break;
			}

			// Write cell value
			$xfIndex = $cell->getXfIndex() + 15; // there are 15 cell style Xfs
			
			if ($cell->getValue() instanceof PHPExcel_RichText) {
				$this->_writeString($row, $column, $cell->getValue()->getPlainText(), $xfIndex);
			} else {
				switch ($cell->getDatatype()) {

				case PHPExcel_Cell_DataType::TYPE_STRING:
					if ($cell->getValue() === '' or $cell->getValue() === null) {
						$this->_writeBlank($row, $column, $xfIndex);
					} else {
						$this->_writeString($row, $column, $cell->getValue(), $xfIndex);
					}
					break;

				case PHPExcel_Cell_DataType::TYPE_FORMULA:
					$this->_writeFormula($row, $column, $cell->getValue(), $xfIndex);
					break;

				case PHPExcel_Cell_DataType::TYPE_BOOL:
					$this->_writeBoolErr($row, $column, $cell->getValue(), 0, $xfIndex);
					break;

				case PHPExcel_Cell_DataType::TYPE_ERROR:
					$this->_writeBoolErr($row, $column, $this->_mapErrorCode($cell->getValue()), 1, $xfIndex);
					break;

				case PHPExcel_Cell_DataType::TYPE_NUMERIC:
					$this->_writeNumber($row, $column, $cell->getValue(), $xfIndex);
					break;
				}
			}
		}

		// Append
		if ($this->_BIFF_version == 0x0600) {
			$this->_storeMsoDrawing();
		}
		$this->_storeWindow2();
		$this->_storeZoom();
		if ($this->_phpSheet->getFreezePane()) {
			$this->_storePanes();
		}
		$this->_storeSelection($this->_selection);
		$this->_storeMergedCells();

		// Hyperlinks
		if ($this->_BIFF_version == 0x0600) {
			foreach ($this->_phpSheet->getHyperLinkCollection() as $coordinate => $hyperlink) {
				list($column, $row) = PHPExcel_Cell::coordinateFromString($coordinate);

				$url = $hyperlink->getUrl();

				if ( strpos($url, 'sheet://') !== false ) {
					// internal to current workbook
					$url = str_replace('sheet://', 'internal:', $url);

				} else if ( preg_match('/^(http:|https:|ftp:|mailto:)/', $url) ) {
					// URL
					// $url = $url;

				} else {
					// external (local file)
					$url = 'external:' . $url;
				}
				
				$this->_writeUrl($row - 1, PHPExcel_Cell::columnIndexFromString($column) - 1, $url);
			}
		}

		/*if ($this->_BIFF_version == 0x0600) {
			$this->_storeDataValidity();
		}*/

		if ($this->_BIFF_version == 0x0600) {
			$this->_storeSheetLayout();
			$this->_storeRangeProtection();
		}

		$this->_storeEof();
	}

	/**
	 * Write a cell range address in BIFF8
	 * always fixed range
	 * See section 2.5.14 in OpenOffice.org's Documentation of the Microsoft Excel File Format
	 *
	 * @param string $range E.g. 'A1' or 'A1:B6'
	 * @return string Binary data
	 */
	private function _writeBIFF8CellRangeAddressFixed($range = 'A1')
	{
		$explodes = explode(':', $range);

		// extract first cell, e.g. 'A1'
		$firstCell = $explodes[0];

		// extract last cell, e.g. 'B6'
		if (count($explodes) == 1) {
			$lastCell = $firstCell;
		} else {
			$lastCell = $explodes[1];
		}

		$firstCellCoordinates = PHPExcel_Cell::coordinateFromString($firstCell); // e.g. array(0, 1)
		$lastCellCoordinates  = PHPExcel_Cell::coordinateFromString($lastCell);  // e.g. array(1, 6)

		$data = pack('vvvv',
			$firstCellCoordinates[1] - 1,
			$lastCellCoordinates[1] - 1,
			PHPExcel_Cell::columnIndexFromString($firstCellCoordinates[0]) - 1,
			PHPExcel_Cell::columnIndexFromString($lastCellCoordinates[0]) - 1
		);

		return $data;
	}

	/**
	 * Retrieves data from memory in one chunk, or from disk in $buffer
	 * sized chunks.
	 *
	 * @return string The data
	 */
	function getData()
	{
		$buffer = 4096;

		// Return data stored in memory
		if (isset($this->_data)) {
			$tmp   = $this->_data;
			unset($this->_data);
			$fh	= $this->_filehandle;
			if ($this->_using_tmpfile) {
				fseek($fh, 0);
			}
			return $tmp;
		}
		// Return data stored on disk
		if ($this->_using_tmpfile) {
			if ($tmp = fread($this->_filehandle, $buffer)) {
				return $tmp;
			}
		}

		// No data to return
		return false;
	}

	/**
	 * Set the width of a single column or a range of columns.
	 *
	 * @param integer $firstcol first column on the range
	 * @param integer $lastcol  last column on the range
	 * @param integer $width	width to set
	 * @param integer $xfIndex  The optional cell style Xf index to apply to the columns
	 * @param integer $hidden   The optional hidden atribute
	 * @param integer $level	The optional outline level
	 */
	private function _setColumn($firstcol, $lastcol, $width, $xfIndex = 15, $hidden = 0, $level = 0)
	{
		$this->_colinfo[] = array($firstcol, $lastcol, $width, $xfIndex, $hidden, $level);

		// Set width to zero if column is hidden
		$width = ($hidden) ? 0 : $width;
	}

	/**
	 * Set which cell or cells are selected in a worksheet
	 *
	 * @access public
	 * @param integer $first_row	first row in the selected quadrant
	 * @param integer $first_column first column in the selected quadrant
	 * @param integer $last_row	 last row in the selected quadrant
	 * @param integer $last_column  last column in the selected quadrant
	 */
	function setSelection($first_row,$first_column,$last_row,$last_column)
	{
		$this->_selection = array($first_row,$first_column,$last_row,$last_column);
	}

	/**
	 * Set the option to print the row and column headers on the printed page.
	 *
	 * @access public
	 * @param integer $print Whether to print the headers or not. Defaults to 1 (print).
	 */
	function printRowColHeaders($print = 1)
	{
		$this->_print_headers = $print;
	}

	/**
	 * Store Worksheet data in memory using the parent's class append() or to a
	 * temporary file, the default.
	 *
	 * @access private
	 * @param string $data The binary data to append
	 */
	function _append($data)
	{
		if ($this->_using_tmpfile) {
			// Add CONTINUE records if necessary
			if (strlen($data) - 4 > $this->_limit) {
				$data = $this->_addContinue($data);
			}
			fwrite($this->_filehandle, $data);
			$this->_datasize += strlen($data);
		} else {
			parent::_append($data);
		}
	}

	/**
	 * This method sets the properties for outlining and grouping. The defaults
	 * correspond to Excel's defaults.
	 *
	 * @param bool $visible
	 * @param bool $symbols_below
	 * @param bool $symbols_right
	 * @param bool $auto_style
	 */
	function setOutline($visible = true, $symbols_below = true, $symbols_right = true, $auto_style = false)
	{
		$this->_outline_on	= $visible;
		$this->_outline_below = $symbols_below;
		$this->_outline_right = $symbols_right;
		$this->_outline_style = $auto_style;

		// Ensure this is a boolean vale for Window2
		if ($this->_outline_on) {
			$this->_outline_on = 1;
		}
	 }

	/**
	 * Write a double to the specified row and column (zero indexed).
	 * An integer can be written as a double. Excel will display an
	 * integer. $format is optional.
	 *
	 * Returns  0 : normal termination
	 *		 -2 : row or column out of range
	 *
	 * @param integer $row	Zero indexed row
	 * @param integer $col	Zero indexed column
	 * @param float   $num	The number to write
	 * @param mixed   $format The optional XF format
	 * @return integer
	 */
	private function _writeNumber($row, $col, $num, $xfIndex)
	{
		$record	= 0x0203;				 // Record identifier
		$length	= 0x000E;				 // Number of bytes to follow

		$header	= pack("vv",  $record, $length);
		$data	  = pack("vvv", $row, $col, $xfIndex);
		$xl_double = pack("d",   $num);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$xl_double = strrev($xl_double);
		}

		$this->_append($header.$data.$xl_double);
		return(0);
	}

	/**
	 * Write a LABELSST record or a LABEL record. Which one depends on BIFF version
	 *
	 * @param int $row Row index (0-based)
	 * @param int $col Column index (0-based)
	 * @param string $str The string
	 * @param int $xfIndex Index to XF record
	 */
	private function _writeString($row, $col, $str, $xfIndex)
	{
		if ($this->_BIFF_version == 0x0600) {
			$this->_writeLabelSst($row, $col, $str, $xfIndex);
		} else {
			$this->_writeLabel($row, $col, $str, $xfIndex);
		}
	}
	/**
	 * Write a string to the specified row and column (zero indexed).
	 * NOTE: there is an Excel 5 defined limit of 255 characters.
	 * $format is optional.
	 * Returns  0 : normal termination
	 *		 -2 : row or column out of range
	 *		 -3 : long string truncated to 255 chars
	 *
	 * @access public
	 * @param integer $row	Zero indexed row
	 * @param integer $col	Zero indexed column
	 * @param string  $str	The string to write
	 * @param mixed   $format The XF format for the cell
	 * @return integer
	 */
	private function _writeLabel($row, $col, $str, $xfIndex)
	{
		$strlen	= strlen($str);
		$record	= 0x0204;				   // Record identifier
		$length	= 0x0008 + $strlen;		 // Bytes to follow

		$str_error = 0;

		if ($strlen > $this->_xls_strmax) { // LABEL must be < 255 chars
			$str	   = substr($str, 0, $this->_xls_strmax);
			$length	= 0x0008 + $this->_xls_strmax;
			$strlen	= $this->_xls_strmax;
			$str_error = -3;
		}

		$header	= pack("vv",   $record, $length);
		$data	  = pack("vvvv", $row, $col, $xfIndex, $strlen);
		$this->_append($header . $data . $str);
		return($str_error);
	}

	/**
	 * Write a string to the specified row and column (zero indexed).
	 * This is the BIFF8 version (no 255 chars limit).
	 * $format is optional.
	 * Returns  0 : normal termination
	 *		 -2 : row or column out of range
	 *		 -3 : long string truncated to 255 chars
	 *
	 * @access public
	 * @param integer $row	Zero indexed row
	 * @param integer $col	Zero indexed column
	 * @param string  $str	The string to write
	 * @param mixed   $format The XF format for the cell
	 * @return integer
	 */
	private function _writeLabelSst($row, $col, $str, $xfIndex)
	{
		$record	= 0x00FD;				   // Record identifier
		$length	= 0x000A;				   // Bytes to follow

		$str = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($str);

		/* check if string is already present */
		if (!isset($this->_str_table[$str])) {
			$this->_str_table[$str] = $this->_str_unique++;
		}
		$this->_str_total++;

		$header	= pack('vv',   $record, $length);
		$data	  = pack('vvvV', $row, $col, $xfIndex, $this->_str_table[$str]);
		$this->_append($header.$data);
	}

	/**
	 * Writes a note associated with the cell given by the row and column.
	 * NOTE records don't have a length limit.
	 *
	 * @param integer $row	Zero indexed row
	 * @param integer $col	Zero indexed column
	 * @param string  $note   The note to write
	 */
	private function _writeNote($row, $col, $note)
	{
		$note_length	= strlen($note);
		$record		 = 0x001C;				// Record identifier
		$max_length	 = 2048;				  // Maximun length for a NOTE record
		//$length	  = 0x0006 + $note_length;	// Bytes to follow

		// Length for this record is no more than 2048 + 6
		$length	= 0x0006 + min($note_length, 2048);
		$header	= pack("vv",   $record, $length);
		$data	  = pack("vvv", $row, $col, $note_length);
		$this->_append($header . $data . substr($note, 0, 2048));

		for ($i = $max_length; $i < $note_length; $i += $max_length) {
			$chunk  = substr($note, $i, $max_length);
			$length = 0x0006 + strlen($chunk);
			$header = pack("vv",   $record, $length);
			$data   = pack("vvv", -1, 0, strlen($chunk));
			$this->_append($header.$data.$chunk);
		}
		return(0);
	}

	/**
	 * Write a blank cell to the specified row and column (zero indexed).
	 * A blank cell is used to specify formatting without adding a string
	 * or a number.
	 *
	 * A blank cell without a format serves no purpose. Therefore, we don't write
	 * a BLANK record unless a format is specified.
	 *
	 * Returns  0 : normal termination (including no format)
	 *		 -1 : insufficient number of arguments
	 *		 -2 : row or column out of range
	 *
	 * @param integer $row	Zero indexed row
	 * @param integer $col	Zero indexed column
	 * @param mixed   $format The XF format
	 */
	function _writeBlank($row, $col, $xfIndex)
	{
		$record	= 0x0201;				 // Record identifier
		$length	= 0x0006;				 // Number of bytes to follow

		$header	= pack("vv",  $record, $length);
		$data	  = pack("vvv", $row, $col, $xfIndex);
		$this->_append($header . $data);
		return 0;
	}

	/**
	 * Write a boolean or an error type to the specified row and column (zero indexed)
	 *
	 * @param int $row Row index (0-based)
	 * @param int $col Column index (0-based)
	 * @param int $value
	 * @param boolean $isError Error or Boolean?
	 * @param int $xfIndex
	 */
	private function _writeBoolErr($row, $col, $value, $isError, $xfIndex)
	{
		$record = 0x0205;
		$length = 8;

		$header	= pack("vv",  $record, $length);
		$data	  = pack("vvvCC", $row, $col, $xfIndex, $value, $isError);
		$this->_append($header . $data);
		return 0;
	}

	/**
	 * Write a formula to the specified row and column (zero indexed).
	 * The textual representation of the formula is passed to the parser in
	 * Parser.php which returns a packed binary string.
	 *
	 * Returns  0 : normal termination
	 *		 -1 : formula errors (bad formula)
	 *		 -2 : row or column out of range
	 *
	 * @param integer $row	 Zero indexed row
	 * @param integer $col	 Zero indexed column
	 * @param string  $formula The formula text string
	 * @param mixed   $format  The optional XF format
	 * @return integer
	 */
	private function _writeFormula($row, $col, $formula, $xfIndex)
	{
		$record	= 0x0006;	 // Record identifier

		// Excel normally stores the last calculated value of the formula in $num.
		// Clearly we are not in a position to calculate this a priori. Instead
		// we set $num to zero and set the option flags in $grbit to ensure
		// automatic calculation of the formula when the file is opened.
		//
		$num	   = 0x00;				// Current value of formula
		$grbit	 = 0x03;				// Option flags
		$unknown   = 0x0000;			  // Must be zero

		// Strip the '=' or '@' sign at the beginning of the formula string
		if (preg_match("/^=/", $formula)) {
			$formula = preg_replace("/(^=)/", "", $formula);
		} elseif (preg_match("/^@/", $formula)) {
			$formula = preg_replace("/(^@)/", "", $formula);
		} else {
			// Error handling
			$this->_writeString($row, $col, 'Unrecognised character for formula');
			return -1;
		}

		// Parse the formula using the parser in Parser.php
		try {
			$error = $this->_parser->parse($formula);
			$formula = $this->_parser->toReversePolish();

			$formlen	= strlen($formula);	// Length of the binary string
			$length	 = 0x16 + $formlen;	 // Length of the record data

			$header	= pack("vv",	  $record, $length);
			$data	  = pack("vvvdvVv", $row, $col, $xfIndex, $num,
										 $grbit, $unknown, $formlen);
			$this->_append($header . $data . $formula);
			return 0;

		} catch (Exception $e) {
			// do nothing
		}

	}

	/**
	 * Write a hyperlink.
	 * This is comprised of two elements: the visible label and
	 * the invisible link. The visible label is the same as the link unless an
	 * alternative string is specified. The label is written using the
	 * _writeString() method. Therefore the 255 characters string limit applies.
	 * $string and $format are optional.
	 *
	 * The hyperlink can be to a http, ftp, mail, internal sheet (not yet), or external
	 * directory url.
	 *
	 * Returns  0 : normal termination
	 *		 -2 : row or column out of range
	 *		 -3 : long string truncated to 255 chars
	 *
	 * @param integer $row	Row
	 * @param integer $col	Column
	 * @param string  $url	URL string
	 * @return integer
	 */
	private function _writeUrl($row, $col, $url)
	{
		// Add start row and col to arg list
		return($this->_writeUrlRange($row, $col, $row, $col, $url));
	}

	/**
	 * This is the more general form of _writeUrl(). It allows a hyperlink to be
	 * written to a range of cells. This function also decides the type of hyperlink
	 * to be written. These are either, Web (http, ftp, mailto), Internal
	 * (Sheet1!A1) or external ('c:\temp\foo.xls#Sheet1!A1').
	 *
	 * @access private
	 * @see _writeUrl()
	 * @param integer $row1   Start row
	 * @param integer $col1   Start column
	 * @param integer $row2   End row
	 * @param integer $col2   End column
	 * @param string  $url	URL string
	 * @return integer
	 */

	function _writeUrlRange($row1, $col1, $row2, $col2, $url)
	{

		// Check for internal/external sheet links or default to web link
		if (preg_match('[^internal:]', $url)) {
			return($this->_writeUrlInternal($row1, $col1, $row2, $col2, $url));
		}
		if (preg_match('[^external:]', $url)) {
			return($this->_writeUrlExternal($row1, $col1, $row2, $col2, $url));
		}
		return($this->_writeUrlWeb($row1, $col1, $row2, $col2, $url));
	}


	/**
	 * Used to write http, ftp and mailto hyperlinks.
	 * The link type ($options) is 0x03 is the same as absolute dir ref without
	 * sheet. However it is differentiated by the $unknown2 data stream.
	 *
	 * @access private
	 * @see _writeUrl()
	 * @param integer $row1   Start row
	 * @param integer $col1   Start column
	 * @param integer $row2   End row
	 * @param integer $col2   End column
	 * @param string  $url	URL string
	 * @return integer
	 */
	function _writeUrlWeb($row1, $col1, $row2, $col2, $url)
	{
		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		// Pack the undocumented parts of the hyperlink stream
		$unknown1	= pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");
		$unknown2	= pack("H*", "E0C9EA79F9BACE118C8200AA004BA90B");

		// Pack the option flags
		$options	 = pack("V", 0x03);

		// Convert URL to a null terminated wchar string
		$url		 = join("\0", preg_split("''", $url, -1, PREG_SPLIT_NO_EMPTY));
		$url		 = $url . "\0\0\0";

		// Pack the length of the URL
		$url_len	 = pack("V", strlen($url));

		// Calculate the data length
		$length	  = 0x34 + strlen($url);

		// Pack the header data
		$header	  = pack("vv",   $record, $length);
		$data		= pack("vvvv", $row1, $row2, $col1, $col2);

		// Write the packed data
		$this->_append($header . $data .
					   $unknown1 . $options .
					   $unknown2 . $url_len . $url);
		return 0;
	}

	/**
	 * Used to write internal reference hyperlinks such as "Sheet1!A1".
	 *
	 * @access private
	 * @see _writeUrl()
	 * @param integer $row1   Start row
	 * @param integer $col1   Start column
	 * @param integer $row2   End row
	 * @param integer $col2   End column
	 * @param string  $url	URL string
	 * @return integer
	 */
	function _writeUrlInternal($row1, $col1, $row2, $col2, $url)
	{
		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		// Strip URL type
		$url = preg_replace('/^internal:/', '', $url);

		// Pack the undocumented parts of the hyperlink stream
		$unknown1	= pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");

		// Pack the option flags
		$options	 = pack("V", 0x08);

		// Convert the URL type and to a null terminated wchar string
		$url .= "\0";

		// character count
		$url_len = PHPExcel_Shared_String::CountCharacters($url);
		$url_len = pack('V', $url_len);

		$url = PHPExcel_Shared_String::ConvertEncoding($url, 'UTF-16LE', 'UTF-8');

		// Calculate the data length
		$length	  = 0x24 + strlen($url);

		// Pack the header data
		$header	  = pack("vv",   $record, $length);
		$data		= pack("vvvv", $row1, $row2, $col1, $col2);

		// Write the packed data
		$this->_append($header . $data .
					   $unknown1 . $options .
					   $url_len . $url);
		return 0;
	}

	/**
	 * Write links to external directory names such as 'c:\foo.xls',
	 * c:\foo.xls#Sheet1!A1', '../../foo.xls'. and '../../foo.xls#Sheet1!A1'.
	 *
	 * Note: Excel writes some relative links with the $dir_long string. We ignore
	 * these cases for the sake of simpler code.
	 *
	 * @access private
	 * @see _writeUrl()
	 * @param integer $row1   Start row
	 * @param integer $col1   Start column
	 * @param integer $row2   End row
	 * @param integer $col2   End column
	 * @param string  $url	URL string
	 * @return integer
	 */
	function _writeUrlExternal($row1, $col1, $row2, $col2, $url)
	{
		// Network drives are different. We will handle them separately
		// MS/Novell network drives and shares start with \\
		if (preg_match('[^external:\\\\]', $url)) {
			return; //($this->_writeUrlExternal_net($row1, $col1, $row2, $col2, $url, $str, $format));
		}

		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		// Strip URL type and change Unix dir separator to Dos style (if needed)
		//
		$url = preg_replace('/^external:/', '', $url);
		$url = preg_replace('/\//', "\\", $url);

		// Determine if the link is relative or absolute:
		//   relative if link contains no dir separator, "somefile.xls"
		//   relative if link starts with up-dir, "..\..\somefile.xls"
		//   otherwise, absolute

		$absolute = 0x00; // relative path
		if ( preg_match('/^[A-Z]:/', $url) ) {
			$absolute = 0x02; // absolute path on Windows, e.g. C:\...
		}
		$link_type			   = 0x01 | $absolute;

		// Determine if the link contains a sheet reference and change some of the
		// parameters accordingly.
		// Split the dir name and sheet name (if it exists)
		/*if (preg_match("/\#/", $url)) {
			list($dir_long, $sheet) = split("\#", $url);
		} else {
			$dir_long = $url;
		}

		if (isset($sheet)) {
			$link_type |= 0x08;
			$sheet_len  = pack("V", strlen($sheet) + 0x01);
			$sheet	  = join("\0", split('', $sheet));
			$sheet	 .= "\0\0\0";
		} else {
			$sheet_len   = '';
			$sheet	   = '';
		}*/
		$dir_long = $url;
		if (preg_match("/\#/", $url)) {
			$link_type |= 0x08;
		}


		// Pack the link type
		$link_type   = pack("V", $link_type);

		// Calculate the up-level dir count e.g.. (..\..\..\ == 3)
		$up_count	= preg_match_all("/\.\.\\\/", $dir_long, $useless);
		$up_count	= pack("v", $up_count);

		// Store the short dos dir name (null terminated)
		$dir_short   = preg_replace("/\.\.\\\/", '', $dir_long) . "\0";

		// Store the long dir name as a wchar string (non-null terminated)
		//$dir_long	   = join("\0", split('', $dir_long));
		$dir_long	   = $dir_long . "\0";

		// Pack the lengths of the dir strings
		$dir_short_len = pack("V", strlen($dir_short)	  );
		$dir_long_len  = pack("V", strlen($dir_long)	   );
		$stream_len	= pack("V", 0);//strlen($dir_long) + 0x06);

		// Pack the undocumented parts of the hyperlink stream
		$unknown1 = pack("H*",'D0C9EA79F9BACE118C8200AA004BA90B02000000'	   );
		$unknown2 = pack("H*",'0303000000000000C000000000000046'			   );
		$unknown3 = pack("H*",'FFFFADDE000000000000000000000000000000000000000');
		$unknown4 = pack("v",  0x03											);

		// Pack the main data stream
		$data		= pack("vvvv", $row1, $row2, $col1, $col2) .
						  $unknown1	 .
						  $link_type	.
						  $unknown2	 .
						  $up_count	 .
						  $dir_short_len.
						  $dir_short	.
						  $unknown3	 .
						  $stream_len   ;/*.
						  $dir_long_len .
						  $unknown4	 .
						  $dir_long	 .
						  $sheet_len	.
						  $sheet		;*/

		// Pack the header data
		$length   = strlen($data);
		$header   = pack("vv", $record, $length);

		// Write the packed data
		$this->_append($header. $data);
		return 0;
	}

	/**
	 * This method is used to set the height and format for a row.
	 *
	 * @param integer $row	The row to set
	 * @param integer $height Height we are giving to the row.
	 *						Use null to set XF without setting height
	 * @param integer $xfIndex  The optional cell style Xf index to apply to the columns
	 * @param bool	$hidden The optional hidden attribute
	 * @param integer $level  The optional outline level for row, in range [0,7]
	 */
	private function _setRow($row, $height, $xfIndex, $hidden = false, $level = 0)
	{
		$record	  = 0x0208;			   // Record identifier
		$length	  = 0x0010;			   // Number of bytes to follow

		$colMic	  = 0x0000;			   // First defined column
		$colMac	  = 0x0000;			   // Last defined column
		$irwMac	  = 0x0000;			   // Used by Excel to optimise loading
		$reserved	= 0x0000;			   // Reserved
		$grbit	   = 0x0000;			   // Option flags
		$ixfe		= $xfIndex;

		if ( $height < 0 ){
			$height = null;
		}

		// Use _setRow($row, null, $XF) to set XF format without setting height
		if ($height != null) {
			$miyRw = $height * 20;  // row height
		} else {
			$miyRw = 0xff;		  // default row height is 256
		}

		// Set the options flags. fUnsynced is used to show that the font and row
		// heights are not compatible. This is usually the case for WriteExcel.
		// The collapsed flag 0x10 doesn't seem to be used to indicate that a row
		// is collapsed. Instead it is used to indicate that the previous row is
		// collapsed. The zero height flag, 0x20, is used to collapse a row.

		$grbit |= $level;
		if ($hidden) {
			$grbit |= 0x0020;
		}
		if ($height !== null) {
			$grbit |= 0x0040; // fUnsynced
		}
		if ($xfIndex !== 0xF) {
			$grbit |= 0x0080;
		}
		$grbit |= 0x0100;

		$header   = pack("vv",	   $record, $length);
		$data	 = pack("vvvvvvvv", $row, $colMic, $colMac, $miyRw,
									 $irwMac,$reserved, $grbit, $ixfe);
		$this->_append($header.$data);
	}

	/**
	 * Writes Excel DIMENSIONS to define the area in which there is data.
	 *
	 * @access private
	 */
	function _storeDimensions()
	{
		$record = 0x0200; // Record identifier

		if ($this->_BIFF_version == 0x0500) {
			$length = 0x000A;			   // Number of bytes to follow
			$data = pack("vvvvv"
					, $this->_firstRowIndex
					, $this->_lastRowIndex + 1
					, $this->_firstColumnIndex
					, $this->_lastColumnIndex + 1
					, 0x0000 // reserved
				);

		} elseif ($this->_BIFF_version == 0x0600) {
			$length = 0x000E;
			$data = pack('VVvvv'
					, $this->_firstRowIndex
					, $this->_lastRowIndex + 1
					, $this->_firstColumnIndex
					, $this->_lastColumnIndex + 1
					, 0x0000 // reserved
				);
		}

		$header = pack("vv", $record, $length);
		$this->_append($header.$data);
	}

	/**
	 * Write BIFF record Window2.
	 *
	 * @access private
	 */
	function _storeWindow2()
	{
		$record		 = 0x023E;	 // Record identifier
		if ($this->_BIFF_version == 0x0500) {
			$length		 = 0x000A;	 // Number of bytes to follow
		} elseif ($this->_BIFF_version == 0x0600) {
			$length		 = 0x0012;
		}

		$grbit		  = 0x00B6;	 // Option flags
		$rwTop		  = 0x0000;	 // Top row visible in window
		$colLeft		= 0x0000;	 // Leftmost column visible in window


		// The options flags that comprise $grbit
		$fDspFmla	   = 0;					 // 0 - bit
		$fDspGrid	   = $this->_phpSheet->getShowGridlines() ? 1 : 0; // 1
		$fDspRwCol	  = 1;					 // 2
		$fFrozen		= $this->_phpSheet->getFreezePane() ? 1 : 0;		// 3
		$fDspZeros	  = 1;					 // 4
		$fDefaultHdr	= 1;					 // 5
		$fArabic		= $this->_phpSheet->getRightToLeft() ? 1 : 0; // 6
		$fDspGuts	   = $this->_outline_on;	// 7
		$fFrozenNoSplit = 0;					 // 0 - bit
		// no support in PHPExcel for selected sheet, therefore sheet is only selected if it is the active sheet
		$fSelected	  = ($this->_phpSheet === $this->_phpSheet->getParent()->getActiveSheet()) ? 1 : 0;
		$fPaged		 = 1;					 // 2

		$grbit			 = $fDspFmla;
		$grbit			|= $fDspGrid	   << 1;
		$grbit			|= $fDspRwCol	  << 2;
		$grbit			|= $fFrozen		<< 3;
		$grbit			|= $fDspZeros	  << 4;
		$grbit			|= $fDefaultHdr	<< 5;
		$grbit			|= $fArabic		<< 6;
		$grbit			|= $fDspGuts	   << 7;
		$grbit			|= $fFrozenNoSplit << 8;
		$grbit			|= $fSelected	  << 9;
		$grbit			|= $fPaged		 << 10;

		$header  = pack("vv",   $record, $length);
		$data	= pack("vvv", $grbit, $rwTop, $colLeft);
		// FIXME !!!
		if ($this->_BIFF_version == 0x0500) {
			$rgbHdr		 = 0x00000000; // Row/column heading and gridline color
			$data .= pack("V", $rgbHdr);
		} elseif ($this->_BIFF_version == 0x0600) {
			$rgbHdr	   = 0x0040; // Row/column heading and gridline color index
			$zoom_factor_page_break = 0x0000;
			$zoom_factor_normal	 = 0x0000;
			$data .= pack("vvvvV", $rgbHdr, 0x0000, $zoom_factor_page_break, $zoom_factor_normal, 0x00000000);
		}
		$this->_append($header.$data);
	}

	/**
	 * Write BIFF record DEFAULTROWHEIGHT.
	 *
	 * @access private
	 */
	private function _storeDefaultRowHeight()
	{
		$defaultRowHeight = $this->_phpSheet->getDefaultRowDimension()->getRowHeight();

		if ($defaultRowHeight < 0) {
			return;
		}

		// convert to twips
		$defaultRowHeight = (int) 20 * $defaultRowHeight;

		$record   = 0x0225;	  // Record identifier
		$length   = 0x0004;	  // Number of bytes to follow

		$header   = pack("vv", $record, $length);
		$data	 = pack("vv",  1, $defaultRowHeight);
		$this->_append($header . $data);
	}

	/**
	 * Write BIFF record DEFCOLWIDTH if COLINFO records are in use.
	 *
	 * @access private
	 */
	function _storeDefcol()
	{
		$defaultColWidth = 8;
		
		$record   = 0x0055;	  // Record identifier
		$length   = 0x0002;	  // Number of bytes to follow

		$header = pack("vv", $record, $length);
		$data = pack("v", $defaultColWidth);
		$this->_append($header . $data);
	}

	/**
	 * Write BIFF record COLINFO to define column widths
	 *
	 * Note: The SDK says the record length is 0x0B but Excel writes a 0x0C
	 * length record.
	 *
	 * @access private
	 * @param array $col_array This is the only parameter received and is composed of the following:
	 *				0 => First formatted column,
	 *				1 => Last formatted column,
	 *				2 => Col width (8.43 is Excel default),
	 *				3 => The optional XF format of the column,
	 *				4 => Option flags.
	 *				5 => Optional outline level
	 */
	function _storeColinfo($col_array)
	{
		if (isset($col_array[0])) {
			$colFirst = $col_array[0];
		}
		if (isset($col_array[1])) {
			$colLast = $col_array[1];
		}
		if (isset($col_array[2])) {
			$coldx = $col_array[2];
		} else {
			$coldx = 8.43;
		}
		if (isset($col_array[3])) {
			$xfIndex = $col_array[3];
		} else {
			$xfIndex = 15;
		}
		if (isset($col_array[4])) {
			$grbit = $col_array[4];
		} else {
			$grbit = 0;
		}
		if (isset($col_array[5])) {
			$level = $col_array[5];
		} else {
			$level = 0;
		}
		$record   = 0x007D;		  // Record identifier
		$length   = 0x000B;		  // Number of bytes to follow

		$coldx   *= 256;			 // Convert to units of 1/256 of a char

		$ixfe	 = $xfIndex;
		$reserved = 0x00;			// Reserved

		$level = max(0, min($level, 7));
		$grbit |= $level << 8;

		$header   = pack("vv",	 $record, $length);
		$data	 = pack("vvvvvC", $colFirst, $colLast, $coldx,
								   $ixfe, $grbit, $reserved);
		$this->_append($header.$data);
	}

	/**
	 * Write BIFF record SELECTION.
	 *
	 * @access private
	 * @param array $array array containing ($rwFirst,$colFirst,$rwLast,$colLast)
	 * @see setSelection()
	 */
	function _storeSelection($array)
	{
		list($rwFirst,$colFirst,$rwLast,$colLast) = $array;
		$record   = 0x001D;				  // Record identifier
		$length   = 0x000F;				  // Number of bytes to follow

		$pnn	  = $this->_active_pane;	 // Pane position
		$rwAct	= $rwFirst;				// Active row
		$colAct   = $colFirst;			   // Active column
		$irefAct  = 0;					   // Active cell ref
		$cref	 = 1;					   // Number of refs

		if (!isset($rwLast)) {
			$rwLast   = $rwFirst;	   // Last  row in reference
		}
		if (!isset($colLast)) {
			$colLast  = $colFirst;	  // Last  col in reference
		}

		// Swap last row/col for first row/col as necessary
		if ($rwFirst > $rwLast) {
			list($rwFirst, $rwLast) = array($rwLast, $rwFirst);
		}

		if ($colFirst > $colLast) {
			list($colFirst, $colLast) = array($colLast, $colFirst);
		}

		$header   = pack("vv",		 $record, $length);
		$data	 = pack("CvvvvvvCC",  $pnn, $rwAct, $colAct,
									   $irefAct, $cref,
									   $rwFirst, $rwLast,
									   $colFirst, $colLast);
		$this->_append($header . $data);
	}

	/**
	 * Store the MERGEDCELLS records for all ranges of merged cells
	 *
	 * @access private
	 */
	function _storeMergedCells()
	{
		$mergeCells = $this->_phpSheet->getMergeCells();
		$countMergeCells = count($mergeCells);
		
		if ($countMergeCells == 0) {
			return;
		}
		
		// maximum allowed number of merged cells per record
		if ($this->_BIFF_version == 0x0600) {
			$maxCountMergeCellsPerRecord = 1027;
		} else {
			$maxCountMergeCellsPerRecord = 259;
		}
		
		// record identifier
		$record = 0x00E5;
		
		// counter for total number of merged cells treated so far by the writer
		$i = 0;
		
		// counter for number of merged cells written in record currently being written
		$j = 0;
		
		// initialize record data
		$recordData = '';
		
		// loop through the merged cells
		foreach ($mergeCells as $mergeCell) {
			++$i;
			++$j;

			// extract the row and column indexes
			$range = PHPExcel_Cell::splitRange($mergeCell);
			list($first, $last) = $range[0];
			list($firstColumn, $firstRow) = PHPExcel_Cell::coordinateFromString($first);
			list($lastColumn, $lastRow) = PHPExcel_Cell::coordinateFromString($last);

			$recordData .= pack('vvvv', $firstRow - 1, $lastRow - 1, PHPExcel_Cell::columnIndexFromString($firstColumn) - 1, PHPExcel_Cell::columnIndexFromString($lastColumn) - 1);

			// flush record if we have reached limit for number of merged cells, or reached final merged cell
			if ($j == $maxCountMergeCellsPerRecord or $i == $countMergeCells) {
				$recordData = pack('v', $j) . $recordData;
				$length = strlen($recordData);
				$header = pack('vv', $record, $length);
				$this->_append($header . $recordData);
				
				// initialize for next record, if any
				$recordData = '';
				$j = 0;
			}
		}
	}

	/**
	 * Write SHEETLAYOUT record
	 */
	private function _storeSheetLayout()
	{
		if (!$this->_phpSheet->isTabColorSet()) {
			return;
		}

		$recordData = pack(
			'vvVVVvv'
			, 0x0862
			, 0x0000		// unused
			, 0x00000000	// unused
			, 0x00000000	// unused
			, 0x00000014	// size of record data
			, $this->_colors[$this->_phpSheet->getTabColor()->getRGB()]	// color index
			, 0x0000		// unused
		);

		$length = strlen($recordData);

		$record = 0x0862; // Record identifier
		$header = pack('vv', $record, $length);
		$this->_append($header . $recordData);
	}
	
	/**
	 * Write BIFF record RANGEPROTECTION
	 * 
	 * Openoffice.org's Documentaion of the Microsoft Excel File Format uses term RANGEPROTECTION for these records
	 * Microsoft Office Excel 97-2007 Binary File Format Specification uses term FEAT for these records
	 */
	private function _storeRangeProtection()
	{
		foreach ($this->_phpSheet->getProtectedCells() as $range => $password) {
			// number of ranges, e.g. 'A1:B3 C20:D25'
			$cellRanges = explode(' ', $range);
			$cref = count($cellRanges);

			$recordData = pack(
				'vvVVvCVvVv',
				0x0868,
				0x00,
				0x0000,
				0x0000,
				0x02,
				0x0,
				0x0000,
				$cref,
				0x0000,
				0x00
			);

			foreach ($cellRanges as $cellRange) {
				$recordData .= $this->_writeBIFF8CellRangeAddressFixed($cellRange);
			}

			// the rgbFeat structure
			$recordData .= pack(
				'VV',
				0x0000,
				hexdec($password)
			);

			$recordData .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong('p' . md5($recordData));

			$length = strlen($recordData);

			$record = 0x0868;		// Record identifier
			$header = pack("vv", $record, $length);
			$this->_append($header . $recordData);
		}
	}

	/**
	 * Write BIFF record EXTERNCOUNT to indicate the number of external sheet
	 * references in a worksheet.
	 *
	 * Excel only stores references to external sheets that are used in formulas.
	 * For simplicity we store references to all the sheets in the workbook
	 * regardless of whether they are used or not. This reduces the overall
	 * complexity and eliminates the need for a two way dialogue between the formula
	 * parser the worksheet objects.
	 *
	 * @access private
	 * @param integer $count The number of external sheet references in this worksheet
	 */
	function _storeExterncount($count)
	{
		$record = 0x0016;		  // Record identifier
		$length = 0x0002;		  // Number of bytes to follow

		$header = pack("vv", $record, $length);
		$data   = pack("v",  $count);
		$this->_append($header . $data);
	}

	/**
	 * Writes the Excel BIFF EXTERNSHEET record. These references are used by
	 * formulas. A formula references a sheet name via an index. Since we store a
	 * reference to all of the external worksheets the EXTERNSHEET index is the same
	 * as the worksheet index.
	 *
	 * @access private
	 * @param string $sheetname The name of a external worksheet
	 */
	function _storeExternsheet($sheetname)
	{
		$record	= 0x0017;		 // Record identifier

		// References to the current sheet are encoded differently to references to
		// external sheets.
		//
		if ($this->_phpSheet->getTitle() == $sheetname) {
			$sheetname = '';
			$length	= 0x02;  // The following 2 bytes
			$cch	   = 1;	 // The following byte
			$rgch	  = 0x02;  // Self reference
		} else {
			$length	= 0x02 + strlen($sheetname);
			$cch	   = strlen($sheetname);
			$rgch	  = 0x03;  // Reference to a sheet in the current workbook
		}

		$header = pack("vv",  $record, $length);
		$data   = pack("CC", $cch, $rgch);
		$this->_append($header . $data . $sheetname);
	}

	/**
	 * Writes the Excel BIFF PANE record.
	 * The panes can either be frozen or thawed (unfrozen).
	 * Frozen panes are specified in terms of an integer number of rows and columns.
	 * Thawed panes are specified in terms of Excel's units for rows and columns.
	 *
	 * @access private
	 */
	function _storePanes()
	{
		$panes = array();
		if ($freezePane = $this->_phpSheet->getFreezePane()) {
			list($column, $row) = PHPExcel_Cell::coordinateFromString($freezePane);
			$panes[0] = $row - 1;
			$panes[1] = PHPExcel_Cell::columnIndexFromString($column) - 1;
		} else {
			// thaw panes
			return;
		}
		
		$y	   = isset($panes[0]) ? $panes[0] : null;
		$x	   = isset($panes[1]) ? $panes[1] : null;
		$rwTop   = isset($panes[2]) ? $panes[2] : null;
		$colLeft = isset($panes[3]) ? $panes[3] : null;
		if (count($panes) > 4) { // if Active pane was received
			$pnnAct = $panes[4];
		} else {
			$pnnAct = null;
		}
		$record  = 0x0041;	   // Record identifier
		$length  = 0x000A;	   // Number of bytes to follow

		// Code specific to frozen or thawed panes.
		if ($this->_phpSheet->getFreezePane()) {
			// Set default values for $rwTop and $colLeft
			if (!isset($rwTop)) {
				$rwTop   = $y;
			}
			if (!isset($colLeft)) {
				$colLeft = $x;
			}
		} else {
			// Set default values for $rwTop and $colLeft
			if (!isset($rwTop)) {
				$rwTop   = 0;
			}
			if (!isset($colLeft)) {
				$colLeft = 0;
			}

			// Convert Excel's row and column units to the internal units.
			// The default row height is 12.75
			// The default column width is 8.43
			// The following slope and intersection values were interpolated.
			//
			$y = 20*$y	  + 255;
			$x = 113.879*$x + 390;
		}


		// Determine which pane should be active. There is also the undocumented
		// option to override this should it be necessary: may be removed later.
		//
		if (!isset($pnnAct)) {
			if ($x != 0 && $y != 0) {
				$pnnAct = 0; // Bottom right
			}
			if ($x != 0 && $y == 0) {
				$pnnAct = 1; // Top right
			}
			if ($x == 0 && $y != 0) {
				$pnnAct = 2; // Bottom left
			}
			if ($x == 0 && $y == 0) {
				$pnnAct = 3; // Top left
			}
		}

		$this->_active_pane = $pnnAct; // Used in _storeSelection

		$header	 = pack("vv",	$record, $length);
		$data	   = pack("vvvvv", $x, $y, $rwTop, $colLeft, $pnnAct);
		$this->_append($header . $data);
	}

	/**
	 * Store the page setup SETUP BIFF record.
	 *
	 * @access private
	 */
	function _storeSetup()
	{
		$record	   = 0x00A1;				  // Record identifier
		$length	   = 0x0022;				  // Number of bytes to follow

		$iPaperSize   = $this->_phpSheet->getPageSetup()->getPaperSize();	// Paper size

		$iScale = $this->_phpSheet->getPageSetup()->getScale() ?
			$this->_phpSheet->getPageSetup()->getScale() : 100;   // Print scaling factor

		$iPageStart   = 0x01;				 // Starting page number
		$iFitWidth	= (int) $this->_phpSheet->getPageSetup()->getFitToWidth();	// Fit to number of pages wide
		$iFitHeight	= (int) $this->_phpSheet->getPageSetup()->getFitToHeight();	// Fit to number of pages high
		$grbit		= 0x00;				 // Option flags
		$iRes		 = 0x0258;			   // Print resolution
		$iVRes		= 0x0258;			   // Vertical print resolution
		
		$numHdr	   = $this->_phpSheet->getPageMargins()->getHeader();  // Header Margin
		
		$numFtr	   = $this->_phpSheet->getPageMargins()->getFooter();   // Footer Margin
		$iCopies	  = 0x01;				 // Number of copies

		$fLeftToRight = 0x0;					 // Print over then down

		// Page orientation
		$fLandscape = ($this->_phpSheet->getPageSetup()->getOrientation() == PHPExcel_Worksheet_PageSetup::ORIENTATION_LANDSCAPE) ?
			0x0 : 0x1;

		$fNoPls	   = 0x0;					 // Setup not read from printer
		$fNoColor	 = 0x0;					 // Print black and white
		$fDraft	   = 0x0;					 // Print draft quality
		$fNotes	   = 0x0;					 // Print notes
		$fNoOrient	= 0x0;					 // Orientation not set
		$fUsePage	 = 0x0;					 // Use custom starting page

		$grbit		   = $fLeftToRight;
		$grbit		  |= $fLandscape	<< 1;
		$grbit		  |= $fNoPls		<< 2;
		$grbit		  |= $fNoColor	  << 3;
		$grbit		  |= $fDraft		<< 4;
		$grbit		  |= $fNotes		<< 5;
		$grbit		  |= $fNoOrient	 << 6;
		$grbit		  |= $fUsePage	  << 7;

		$numHdr = pack("d", $numHdr);
		$numFtr = pack("d", $numFtr);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$numHdr = strrev($numHdr);
			$numFtr = strrev($numFtr);
		}

		$header = pack("vv", $record, $length);
		$data1  = pack("vvvvvvvv", $iPaperSize,
								   $iScale,
								   $iPageStart,
								   $iFitWidth,
								   $iFitHeight,
								   $grbit,
								   $iRes,
								   $iVRes);
		$data2  = $numHdr.$numFtr;
		$data3  = pack("v", $iCopies);
		$this->_append($header . $data1 . $data2 . $data3);
	}

	/**
	 * Store the header caption BIFF record.
	 *
	 * @access private
	 */
	function _storeHeader()
	{
		$record  = 0x0014;			   // Record identifier

		/* removing for now
		// need to fix character count (multibyte!)
		if (strlen($this->_phpSheet->getHeaderFooter()->getOddHeader()) <= 255) {
			$str	  = $this->_phpSheet->getHeaderFooter()->getOddHeader();	   // header string
		} else {
			$str = '';
		}
		*/
		
		if ($this->_BIFF_version == 0x0600) {
			$recordData = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($this->_phpSheet->getHeaderFooter()->getOddHeader());
			$length = strlen($recordData);
		} else {
			$cch	  = strlen($this->_phpSheet->getHeaderFooter()->getOddHeader());		 // Length of header string
			$length  = 1 + $cch;			 // Bytes to follow
			$data	  = pack("C",  $cch);
			$recordData = $data . $this->_phpSheet->getHeaderFooter()->getOddHeader();
		}

		$header   = pack("vv", $record, $length);

		$this->_append($header . $recordData);
	}

	/**
	 * Store the footer caption BIFF record.
	 *
	 * @access private
	 */
	function _storeFooter()
	{
		$record  = 0x0015;			   // Record identifier

		/* removing for now
		// need to fix character count (multibyte!)
		if (strlen($this->_phpSheet->getHeaderFooter()->getOddFooter()) <= 255) {
			$str = $this->_phpSheet->getHeaderFooter()->getOddFooter();
		} else {
			$str = '';
		}
		*/
		
		if ($this->_BIFF_version == 0x0600) {
			$recordData = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($this->_phpSheet->getHeaderFooter()->getOddFooter());
			$length = strlen($recordData);
		} else {
			$cch	  = strlen($this->_phpSheet->getHeaderFooter()->getOddFooter());		 // Length of footer string
			$length  = 1 + $cch;
			$data	  = pack("C",  $cch);
			$recordData = $data . $this->_phpSheet->getHeaderFooter()->getOddFooter();
		}

		$header	= pack("vv", $record, $length);

		$this->_append($header . $recordData);
	}

	/**
	 * Store the horizontal centering HCENTER BIFF record.
	 *
	 * @access private
	 */
	function _storeHcenter()
	{
		$record   = 0x0083;			  // Record identifier
		$length   = 0x0002;			  // Bytes to follow

		$fHCenter = $this->_phpSheet->getPageSetup()->getHorizontalCentered() ? 1 : 0;	 // Horizontal centering

		$header	= pack("vv", $record, $length);
		$data	  = pack("v",  $fHCenter);

		$this->_append($header.$data);
	}

	/**
	 * Store the vertical centering VCENTER BIFF record.
	 *
	 * @access private
	 */
	function _storeVcenter()
	{
		$record   = 0x0084;			  // Record identifier
		$length   = 0x0002;			  // Bytes to follow

		$fVCenter = $this->_phpSheet->getPageSetup()->getVerticalCentered() ? 1 : 0;	 // Horizontal centering

		$header	= pack("vv", $record, $length);
		$data	  = pack("v",  $fVCenter);
		$this->_append($header . $data);
	}

	/**
	 * Store the LEFTMARGIN BIFF record.
	 *
	 * @access private
	 */
	function _storeMarginLeft()
	{
		$record  = 0x0026;				   // Record identifier
		$length  = 0x0008;				   // Bytes to follow

		$margin  = $this->_phpSheet->getPageMargins()->getLeft();	 // Margin in inches

		$header	= pack("vv",  $record, $length);
		$data	  = pack("d",   $margin);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$data = strrev($data);
		}

		$this->_append($header . $data);
	}

	/**
	 * Store the RIGHTMARGIN BIFF record.
	 *
	 * @access private
	 */
	function _storeMarginRight()
	{
		$record  = 0x0027;				   // Record identifier
		$length  = 0x0008;				   // Bytes to follow

		$margin  = $this->_phpSheet->getPageMargins()->getRight();	 // Margin in inches

		$header	= pack("vv",  $record, $length);
		$data	  = pack("d",   $margin);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$data = strrev($data);
		}

		$this->_append($header . $data);
	}

	/**
	 * Store the TOPMARGIN BIFF record.
	 *
	 * @access private
	 */
	function _storeMarginTop()
	{
		$record  = 0x0028;				   // Record identifier
		$length  = 0x0008;				   // Bytes to follow

		$margin  = $this->_phpSheet->getPageMargins()->getTop();	 // Margin in inches

		$header	= pack("vv",  $record, $length);
		$data	  = pack("d",   $margin);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$data = strrev($data);
		}

		$this->_append($header . $data);
	}

	/**
	 * Store the BOTTOMMARGIN BIFF record.
	 *
	 * @access private
	 */
	function _storeMarginBottom()
	{
		$record  = 0x0029;				   // Record identifier
		$length  = 0x0008;				   // Bytes to follow

		$margin  = $this->_phpSheet->getPageMargins()->getBottom();	 // Margin in inches

		$header	= pack("vv",  $record, $length);
		$data	  = pack("d",   $margin);
		if (PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder()) { // if it's Big Endian
			$data = strrev($data);
		}

		$this->_append($header . $data);
	}

	/**
	 * Write the PRINTHEADERS BIFF record.
	 *
	 * @access private
	 */
	function _storePrintHeaders()
	{
		$record	  = 0x002a;				   // Record identifier
		$length	  = 0x0002;				   // Bytes to follow

		$fPrintRwCol = $this->_print_headers;	 // Boolean flag

		$header	  = pack("vv", $record, $length);
		$data		= pack("v", $fPrintRwCol);
		$this->_append($header . $data);
	}

	/**
	 * Write the PRINTGRIDLINES BIFF record. Must be used in conjunction with the
	 * GRIDSET record.
	 *
	 * @access private
	 */
	function _storePrintGridlines()
	{
		$record	  = 0x002b;					// Record identifier
		$length	  = 0x0002;					// Bytes to follow

		$fPrintGrid  = $this->_phpSheet->getPrintGridlines() ? 1 : 0;	// Boolean flag

		$header	  = pack("vv", $record, $length);
		$data		= pack("v", $fPrintGrid);
		$this->_append($header . $data);
	}

	/**
	 * Write the GRIDSET BIFF record. Must be used in conjunction with the
	 * PRINTGRIDLINES record.
	 *
	 * @access private
	 */
	function _storeGridset()
	{
		$record	  = 0x0082;						// Record identifier
		$length	  = 0x0002;						// Bytes to follow

		$fGridSet	= !$this->_phpSheet->getPrintGridlines();	 // Boolean flag

		$header	  = pack("vv",  $record, $length);
		$data		= pack("v",   $fGridSet);
		$this->_append($header . $data);
	}

	/**
	 * Write the GUTS BIFF record. This is used to configure the gutter margins
	 * where Excel outline symbols are displayed. The visibility of the gutters is
	 * controlled by a flag in WSBOOL.
	 *
	 * @see _storeWsbool()
	 * @access private
	 */
	function _storeGuts()
	{
		$record	  = 0x0080;   // Record identifier
		$length	  = 0x0008;   // Bytes to follow

		$dxRwGut	 = 0x0000;   // Size of row gutter
		$dxColGut	= 0x0000;   // Size of col gutter

		// determine maximum row outline level
		$maxRowOutlineLevel = 0;
		foreach ($this->_phpSheet->getRowDimensions() as $rowDimension) {
			$maxRowOutlineLevel = max($maxRowOutlineLevel, $rowDimension->getOutlineLevel());
		}

		$col_level   = 0;

		// Calculate the maximum column outline level. The equivalent calculation
		// for the row outline level is carried out in _setRow().
		$colcount = count($this->_colinfo);
		for ($i = 0; $i < $colcount; ++$i) {
			$col_level = max($this->_colinfo[$i][5], $col_level);
		}

		// Set the limits for the outline levels (0 <= x <= 7).
		$col_level = max(0, min($col_level, 7));

		// The displayed level is one greater than the max outline levels
		if ($maxRowOutlineLevel) {
			++$maxRowOutlineLevel;
		}
		if ($col_level) {
			++$col_level;
		}

		$header	  = pack("vv",   $record, $length);
		$data		= pack("vvvv", $dxRwGut, $dxColGut, $maxRowOutlineLevel, $col_level);

		$this->_append($header.$data);
	}


	/**
	 * Write the WSBOOL BIFF record, mainly for fit-to-page. Used in conjunction
	 * with the SETUP record.
	 *
	 * @access private
	 */
	function _storeWsbool()
	{
		$record	  = 0x0081;   // Record identifier
		$length	  = 0x0002;   // Bytes to follow
		$grbit	   = 0x0000;

		// The only option that is of interest is the flag for fit to page. So we
		// set all the options in one go.
		//
		// Set the option flags
		$grbit |= 0x0001;						   // Auto page breaks visible
		if ($this->_outline_style) {
			$grbit |= 0x0020; // Auto outline styles
		}
		if ($this->_phpSheet->getShowSummaryBelow()) {
			$grbit |= 0x0040; // Outline summary below
		}
		if ($this->_phpSheet->getShowSummaryRight()) {
			$grbit |= 0x0080; // Outline summary right
		}
		if ($this->_phpSheet->getPageSetup()->getFitToPage()) {
			$grbit |= 0x0100; // Page setup fit to page
		}
		if ($this->_outline_on) {
			$grbit |= 0x0400; // Outline symbols displayed
		}

		$header	  = pack("vv", $record, $length);
		$data		= pack("v",  $grbit);
		$this->_append($header . $data);
	}

	/**
	 * Write the HORIZONTALPAGEBREAKS and VERTICALPAGEBREAKS BIFF records.
	 */
	private function _storeBreaks()
	{
		// initialize
		$vbreaks = array();
		$hbreaks = array();

		foreach ($this->_phpSheet->getBreaks() as $cell => $breakType) {
			// Fetch coordinates
			$coordinates = PHPExcel_Cell::coordinateFromString($cell);

			// Decide what to do by the type of break
			switch ($breakType) {
				case PHPExcel_Worksheet::BREAK_COLUMN:
					// Add to list of vertical breaks
					$vbreaks[] = PHPExcel_Cell::columnIndexFromString($coordinates[0]) - 1;
					break;

				case PHPExcel_Worksheet::BREAK_ROW:
					// Add to list of horizontal breaks
					$hbreaks[] = $coordinates[1];
					break;

				case PHPExcel_Worksheet::BREAK_NONE:
				default:
					// Nothing to do
					break;
			}
		}
		
		//horizontal page breaks
		if (count($hbreaks) > 0) {

			// Sort and filter array of page breaks
			sort($hbreaks, SORT_NUMERIC);
			if ($hbreaks[0] == 0) { // don't use first break if it's 0
				array_shift($hbreaks);
			}

			$record  = 0x001b;			   // Record identifier
			$cbrk	= count($hbreaks);	   // Number of page breaks
			if ($this->_BIFF_version == 0x0600) {
				$length  = 2 + 6 * $cbrk;	  // Bytes to follow
			} else {
				$length  = 2 + 2 * $cbrk;	  // Bytes to follow
			}

			$header  = pack("vv", $record, $length);
			$data	= pack("v",  $cbrk);

			// Append each page break
			foreach ($hbreaks as $hbreak) {
				if ($this->_BIFF_version == 0x0600) {
					$data .= pack("vvv", $hbreak, 0x0000, 0x00ff);
				} else {
					$data .= pack("v", $hbreak);
				}
			}

			$this->_append($header . $data);
		}

		// vertical page breaks
		if (count($vbreaks) > 0) {

			// 1000 vertical pagebreaks appears to be an internal Excel 5 limit.
			// It is slightly higher in Excel 97/200, approx. 1026
			$vbreaks = array_slice($vbreaks, 0, 1000);

			// Sort and filter array of page breaks
			sort($vbreaks, SORT_NUMERIC);
			if ($vbreaks[0] == 0) { // don't use first break if it's 0
				array_shift($vbreaks);
			}

			$record  = 0x001a;			   // Record identifier
			$cbrk	= count($vbreaks);	   // Number of page breaks
			if ($this->_BIFF_version == 0x0600) {
				$length  = 2 + 6 * $cbrk;	  // Bytes to follow
			} else {
				$length  = 2 + 2 * $cbrk;	  // Bytes to follow
			}

			$header  = pack("vv",  $record, $length);
			$data	= pack("v",   $cbrk);

			// Append each page break
			foreach ($vbreaks as $vbreak) {
				if ($this->_BIFF_version == 0x0600) {
					$data .= pack("vvv", $vbreak, 0x0000, 0xffff);
				} else {
					$data .= pack("v", $vbreak);
				}
			}

			$this->_append($header . $data);
		}
	}

	/**
	 * Set the Biff PROTECT record to indicate that the worksheet is protected.
	 *
	 * @access private
	 */
	function _storeProtect()
	{
		// Exit unless sheet protection has been specified
		if (!$this->_phpSheet->getProtection()->getSheet()) {
			return;
		}

		$record	  = 0x0012;			 // Record identifier
		$length	  = 0x0002;			 // Bytes to follow

		$fLock	   = 1;	// Worksheet is protected

		$header	  = pack("vv", $record, $length);
		$data		= pack("v",  $fLock);

		$this->_append($header.$data);
	}

	/**
	 * Write the worksheet PASSWORD record.
	 *
	 * @access private
	 */
	function _storePassword()
	{
		// Exit unless sheet protection and password have been specified
		if (!$this->_phpSheet->getProtection()->getSheet() || !$this->_phpSheet->getProtection()->getPassword()) {
			return;
		}

		$record	  = 0x0013;			   // Record identifier
		$length	  = 0x0002;			   // Bytes to follow

		$wPassword   = hexdec($this->_phpSheet->getProtection()->getPassword());	 // Encoded password

		$header	  = pack("vv", $record, $length);
		$data		= pack("v",  $wPassword);

		$this->_append($header . $data);
	}


	/**
	 * Insert a 24bit bitmap image in a worksheet.
	 *
	 * @access public
	 * @param integer $row	 The row we are going to insert the bitmap into
	 * @param integer $col	 The column we are going to insert the bitmap into
	 * @param mixed   $bitmap  The bitmap filename or GD-image resource
	 * @param integer $x	   The horizontal position (offset) of the image inside the cell.
	 * @param integer $y	   The vertical position (offset) of the image inside the cell.
	 * @param float   $scale_x The horizontal scale
	 * @param float   $scale_y The vertical scale
	 */
	function insertBitmap($row, $col, $bitmap, $x = 0, $y = 0, $scale_x = 1, $scale_y = 1)
	{
		$bitmap_array = (is_resource($bitmap) ? $this->_processBitmapGd($bitmap) : $this->_processBitmap($bitmap));
		list($width, $height, $size, $data) = $bitmap_array; //$this->_processBitmap($bitmap);

		// Scale the frame of the image.
		$width  *= $scale_x;
		$height *= $scale_y;

		// Calculate the vertices of the image and write the OBJ record
		$this->_positionImage($col, $row, $x, $y, $width, $height);

		// Write the IMDATA record to store the bitmap data
		$record	  = 0x007f;
		$length	  = 8 + $size;
		$cf		  = 0x09;
		$env		 = 0x01;
		$lcb		 = $size;

		$header	  = pack("vvvvV", $record, $length, $cf, $env, $lcb);
		$this->_append($header.$data);
	}

	/**
	 * Calculate the vertices that define the position of the image as required by
	 * the OBJ record.
	 *
	 *		 +------------+------------+
	 *		 |	 A	  |	  B	 |
	 *   +-----+------------+------------+
	 *   |	 |(x1,y1)	 |			|
	 *   |  1  |(A1)._______|______	  |
	 *   |	 |	|			  |	 |
	 *   |	 |	|			  |	 |
	 *   +-----+----|	BITMAP	|-----+
	 *   |	 |	|			  |	 |
	 *   |  2  |	|______________.	 |
	 *   |	 |			|		(B2)|
	 *   |	 |			|	 (x2,y2)|
	 *   +---- +------------+------------+
	 *
	 * Example of a bitmap that covers some of the area from cell A1 to cell B2.
	 *
	 * Based on the width and height of the bitmap we need to calculate 8 vars:
	 *	 $col_start, $row_start, $col_end, $row_end, $x1, $y1, $x2, $y2.
	 * The width and height of the cells are also variable and have to be taken into
	 * account.
	 * The values of $col_start and $row_start are passed in from the calling
	 * function. The values of $col_end and $row_end are calculated by subtracting
	 * the width and height of the bitmap from the width and height of the
	 * underlying cells.
	 * The vertices are expressed as a percentage of the underlying cell width as
	 * follows (rhs values are in pixels):
	 *
	 *	   x1 = X / W *1024
	 *	   y1 = Y / H *256
	 *	   x2 = (X-1) / W *1024
	 *	   y2 = (Y-1) / H *256
	 *
	 *	   Where:  X is distance from the left side of the underlying cell
	 *			   Y is distance from the top of the underlying cell
	 *			   W is the width of the cell
	 *			   H is the height of the cell
	 * The SDK incorrectly states that the height should be expressed as a
	 *		percentage of 1024.
	 *
	 * @access private
	 * @param integer $col_start Col containing upper left corner of object
	 * @param integer $row_start Row containing top left corner of object
	 * @param integer $x1		Distance to left side of object
	 * @param integer $y1		Distance to top of object
	 * @param integer $width	 Width of image frame
	 * @param integer $height	Height of image frame
	 */
	function _positionImage($col_start, $row_start, $x1, $y1, $width, $height)
	{
		// Initialise end cell to the same as the start cell
		$col_end	= $col_start;  // Col containing lower right corner of object
		$row_end	= $row_start;  // Row containing bottom right corner of object

		// Zero the specified offset if greater than the cell dimensions
		if ($x1 >= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start))) {
			$x1 = 0;
		}
		if ($y1 >= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1)) {
			$y1 = 0;
		}

		$width	  = $width  + $x1 -1;
		$height	 = $height + $y1 -1;

		// Subtract the underlying cell widths to find the end cell of the image
		while ($width >= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end))) {
			$width -= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end));
			++$col_end;
		}

		// Subtract the underlying cell heights to find the end cell of the image
		while ($height >= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1)) {
			$height -= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1);
			++$row_end;
		}

		// Bitmap isn't allowed to start or finish in a hidden cell, i.e. a cell
		// with zero eight or width.
		//
		if (PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start)) == 0) {
			return;
		}
		if (PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end))   == 0) {
			return;
		}
		if (PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1) == 0) {
			return;
		}
		if (PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1)   == 0) {
			return;
		}

		// Convert the pixel values to the percentage value expected by Excel
		$x1 = $x1	 / PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start))   * 1024;
		$y1 = $y1	 / PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1)   *  256;
		$x2 = $width  / PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end))	 * 1024; // Distance to right side of object
		$y2 = $height / PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1)	 *  256; // Distance to bottom of object

		$this->_storeObjPicture($col_start, $x1,
								 $row_start, $y1,
								 $col_end, $x2,
								 $row_end, $y2);
	}

	/**
	 * Store the OBJ record that precedes an IMDATA record. This could be generalise
	 * to support other Excel objects.
	 *
	 * @access private
	 * @param integer $colL Column containing upper left corner of object
	 * @param integer $dxL  Distance from left side of cell
	 * @param integer $rwT  Row containing top left corner of object
	 * @param integer $dyT  Distance from top of cell
	 * @param integer $colR Column containing lower right corner of object
	 * @param integer $dxR  Distance from right of cell
	 * @param integer $rwB  Row containing bottom right corner of object
	 * @param integer $dyB  Distance from bottom of cell
	 */
	function _storeObjPicture($colL,$dxL,$rwT,$dyT,$colR,$dxR,$rwB,$dyB)
	{
		$record	  = 0x005d;   // Record identifier
		$length	  = 0x003c;   // Bytes to follow

		$cObj		= 0x0001;   // Count of objects in file (set to 1)
		$OT		  = 0x0008;   // Object type. 8 = Picture
		$id		  = 0x0001;   // Object ID
		$grbit	   = 0x0614;   // Option flags

		$cbMacro	 = 0x0000;   // Length of FMLA structure
		$Reserved1   = 0x0000;   // Reserved
		$Reserved2   = 0x0000;   // Reserved

		$icvBack	 = 0x09;	 // Background colour
		$icvFore	 = 0x09;	 // Foreground colour
		$fls		 = 0x00;	 // Fill pattern
		$fAuto	   = 0x00;	 // Automatic fill
		$icv		 = 0x08;	 // Line colour
		$lns		 = 0xff;	 // Line style
		$lnw		 = 0x01;	 // Line weight
		$fAutoB	  = 0x00;	 // Automatic border
		$frs		 = 0x0000;   // Frame style
		$cf		  = 0x0009;   // Image format, 9 = bitmap
		$Reserved3   = 0x0000;   // Reserved
		$cbPictFmla  = 0x0000;   // Length of FMLA structure
		$Reserved4   = 0x0000;   // Reserved
		$grbit2	  = 0x0001;   // Option flags
		$Reserved5   = 0x0000;   // Reserved


		$header	  = pack("vv", $record, $length);
		$data		= pack("V", $cObj);
		$data	   .= pack("v", $OT);
		$data	   .= pack("v", $id);
		$data	   .= pack("v", $grbit);
		$data	   .= pack("v", $colL);
		$data	   .= pack("v", $dxL);
		$data	   .= pack("v", $rwT);
		$data	   .= pack("v", $dyT);
		$data	   .= pack("v", $colR);
		$data	   .= pack("v", $dxR);
		$data	   .= pack("v", $rwB);
		$data	   .= pack("v", $dyB);
		$data	   .= pack("v", $cbMacro);
		$data	   .= pack("V", $Reserved1);
		$data	   .= pack("v", $Reserved2);
		$data	   .= pack("C", $icvBack);
		$data	   .= pack("C", $icvFore);
		$data	   .= pack("C", $fls);
		$data	   .= pack("C", $fAuto);
		$data	   .= pack("C", $icv);
		$data	   .= pack("C", $lns);
		$data	   .= pack("C", $lnw);
		$data	   .= pack("C", $fAutoB);
		$data	   .= pack("v", $frs);
		$data	   .= pack("V", $cf);
		$data	   .= pack("v", $Reserved3);
		$data	   .= pack("v", $cbPictFmla);
		$data	   .= pack("v", $Reserved4);
		$data	   .= pack("v", $grbit2);
		$data	   .= pack("V", $Reserved5);

		$this->_append($header . $data);
	}

	/**
	 * Convert a GD-image into the internal format.
	 *
	 * @access private
	 * @param resource $image The image to process
	 * @return array Array with data and properties of the bitmap
	 */
	function _processBitmapGd($image) {
		$width = imagesx($image);
		$height = imagesy($image);

		$data = pack("Vvvvv", 0x000c, $width, $height, 0x01, 0x18);
		for ($j=$height; $j--; ) {
			for ($i=0; $i < $width; ++$i) {
				$color = imagecolorsforindex($image, imagecolorat($image, $i, $j));
				foreach (array("red", "green", "blue") as $key) {
					$color[$key] = $color[$key] + round((255 - $color[$key]) * $color["alpha"] / 127);
				}
				$data .= chr($color["blue"]) . chr($color["green"]) . chr($color["red"]);
			}
			if (3*$width % 4) {
				$data .= str_repeat("\x00", 4 - 3*$width % 4);
			}
		}

		return array($width, $height, strlen($data), $data);
	}

	/**
	 * Convert a 24 bit bitmap into the modified internal format used by Windows.
	 * This is described in BITMAPCOREHEADER and BITMAPCOREINFO structures in the
	 * MSDN library.
	 *
	 * @access private
	 * @param string $bitmap The bitmap to process
	 * @return array Array with data and properties of the bitmap
	 */
	function _processBitmap($bitmap)
	{
		// Open file.
		$bmp_fd = @fopen($bitmap,"rb");
		if (!$bmp_fd) {
			throw new Exception("Couldn't import $bitmap");
		}

		// Slurp the file into a string.
		$data = fread($bmp_fd, filesize($bitmap));

		// Check that the file is big enough to be a bitmap.
		if (strlen($data) <= 0x36) {
			throw new Exception("$bitmap doesn't contain enough data.\n");
		}

		// The first 2 bytes are used to identify the bitmap.
		$identity = unpack("A2ident", $data);
		if ($identity['ident'] != "BM") {
			throw new Exception("$bitmap doesn't appear to be a valid bitmap image.\n");
		}

		// Remove bitmap data: ID.
		$data = substr($data, 2);

		// Read and remove the bitmap size. This is more reliable than reading
		// the data size at offset 0x22.
		//
		$size_array   = unpack("Vsa", substr($data, 0, 4));
		$size   = $size_array['sa'];
		$data   = substr($data, 4);
		$size  -= 0x36; // Subtract size of bitmap header.
		$size  += 0x0C; // Add size of BIFF header.

		// Remove bitmap data: reserved, offset, header length.
		$data = substr($data, 12);

		// Read and remove the bitmap width and height. Verify the sizes.
		$width_and_height = unpack("V2", substr($data, 0, 8));
		$width  = $width_and_height[1];
		$height = $width_and_height[2];
		$data   = substr($data, 8);
		if ($width > 0xFFFF) {
			throw new Exception("$bitmap: largest image width supported is 65k.\n");
		}
		if ($height > 0xFFFF) {
			throw new Exception("$bitmap: largest image height supported is 65k.\n");
		}

		// Read and remove the bitmap planes and bpp data. Verify them.
		$planes_and_bitcount = unpack("v2", substr($data, 0, 4));
		$data = substr($data, 4);
		if ($planes_and_bitcount[2] != 24) { // Bitcount
			throw new Exception("$bitmap isn't a 24bit true color bitmap.\n");
		}
		if ($planes_and_bitcount[1] != 1) {
			throw new Exception("$bitmap: only 1 plane supported in bitmap image.\n");
		}

		// Read and remove the bitmap compression. Verify compression.
		$compression = unpack("Vcomp", substr($data, 0, 4));
		$data = substr($data, 4);

		//$compression = 0;
		if ($compression['comp'] != 0) {
			throw new Exception("$bitmap: compression not supported in bitmap image.\n");
		}

		// Remove bitmap data: data size, hres, vres, colours, imp. colours.
		$data = substr($data, 20);

		// Add the BITMAPCOREHEADER data
		$header  = pack("Vvvvv", 0x000c, $width, $height, 0x01, 0x18);
		$data	= $header . $data;

		return (array($width, $height, $size, $data));
	}

	/**
	 * Store the window zoom factor. This should be a reduced fraction but for
	 * simplicity we will store all fractions with a numerator of 100.
	 *
	 * @access private
	 */
	function _storeZoom()
	{
		// If scale is 100 we don't need to write a record
		if ($this->_phpSheet->getSheetView()->getZoomScale() == 100) {
			return;
		}

		$record	  = 0x00A0;			   // Record identifier
		$length	  = 0x0004;			   // Bytes to follow

		$header	  = pack("vv", $record, $length);
		$data		= pack("vv", $this->_phpSheet->getSheetView()->getZoomScale(), 100);
		$this->_append($header . $data);
	}

	/**
	 * Write MSODRAWING record
	 */
	private function _storeMsoDrawing()
	{
		// check if there are any shapes for this sheet
		if (count($this->_phpSheet->getDrawingCollection()) == 0) {
			return;
		}

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

		// dgContainer
		$dgContainer = new PHPExcel_Shared_Escher_DgContainer();

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

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

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

		// add the shapes

		// outer loop is for determining BSE index
		$blipIndex = 0; // 1-based index to BstoreContainer

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

		foreach ($this->_phpSheet->getParent()->getAllsheets() as $sheet) {
			foreach ($sheet->getDrawingCollection() as $drawing) {
				++$blipIndex;

				if ($sheet === $this->_phpSheet) {
					++$countShapes;

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

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

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

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

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

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

					$twoAnchor = PHPExcel_Shared_Excel5::oneAnchor2twoAnchor($this->_phpSheet, $coordinates, $offsetX, $offsetY, $width, $height);

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

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

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

		// write the Escher stream
		$writer = new PHPExcel_Writer_Excel5_Escher($escher);
		$data = $writer->close();
		$spOffsets = $writer->getSpOffsets();

		// write the neccesary MSODRAWING, OBJ records

		// split the Escher stream
		$spOffsets[0] = 0;
		$nm = count($spOffsets) - 1; // number of shapes excluding first shape
		for ($i = 1; $i <= $nm; ++$i) {
			// MSODRAWING record
			$record = 0x00EC;			// Record identifier

			// chunk of Escher stream for one shape

			$dataChunk = substr($data, $spOffsets[$i -1], $spOffsets[$i] - $spOffsets[$i - 1]);

			$length = strlen($dataChunk);
			$header = pack("vv", $record, $length);

			$this->_append($header . $dataChunk);

			// OBJ record
			$record = 0x005D; // record identifier
			$objData = '';

			// ftCmo
			$objData .=
				pack('vvvvvVVV'
					, 0x0015	// 0x0015 = ftCmo
					, 0x0012	// length of ftCmo data
					, 0x0008	// object type, 0x0008 = picture
					, $i		// object id number, Excel seems to use 1-based index, local for the sheet
					, 0x6011	// option flags, 0x6011 is what OpenOffice.org uses
					, 0			// reserved
					, 0			// reserved
					, 0			// reserved
				);
			// ftEnd
			$objData .=
				pack('vv'
					, 0x0000	// 0x0000 = ftEnd
					, 0x0000	// length of ftEnd data
				);

			$length = strlen($objData);
			$header = pack('vv', $record, $length);
			$this->_append($header . $objData);
		}
		
	}

	/**
	 * Store the DVAL and DV records.
	 *
	 * @access private
	 */
	function _storeDataValidity()
	{
		$record	  = 0x01b2;	  // Record identifier
		$length	  = 0x0012;	  // Bytes to follow

		$grbit	   = 0x0002;	  // Prompt box at cell, no cached validity data at DV records
		$horPos	  = 0x00000000;  // Horizontal position of prompt box, if fixed position
		$verPos	  = 0x00000000;  // Vertical position of prompt box, if fixed position
		$objId	   = 0xffffffff;  // Object identifier of drop down arrow object, or -1 if not visible

		$header	  = pack('vv', $record, $length);
		$data		= pack('vVVVV', $grbit, $horPos, $verPos, $objId,
									 count($this->_dv));
		$this->_append($header.$data);

		$record = 0x01be;			  // Record identifier
		foreach ($this->_dv as $dv) {
			$length = strlen($dv);	  // Bytes to follow
			$header = pack("vv", $record, $length);
			$this->_append($header . $dv);
		}
	}

	/**
	 * Map Error code
	 */
	private function _mapErrorCode($errorCode) {
		switch ($errorCode) {
			case '#NULL!':	return 0x00;
			case '#DIV/0!':	return 0x07;
			case '#VALUE!':	return 0x0F;
			case '#REF!':	return 0x17;
			case '#NAME?':	return 0x1D;
			case '#NUM!':	return 0x24;
			case '#N/A':	return 0x2A;
		}

		return 0;
	}

}
