/branches/v1.6.3/Classes/PHPExcel/Writer/Excel5/Worksheet.php

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<?php
/*
*  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:
*
*	PHPExcel_Writer_Excel5_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
*/

require_once 'PHPExcel/Writer/Excel5/Parser.php';
require_once 'PHPExcel/Writer/Excel5/BIFFwriter.php';

/**
* Class for generating Excel Spreadsheets
*
* @author   Xavier Noguer <xnoguer@rezebra.com>
* @category FileFormats
* @package  PHPExcel_Writer_Excel5_Writer
*/

class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
{
	/**
	* Name of the Worksheet
	* @var string
	*/
	var $name;

	/**
	* Index for the Worksheet
	* @var integer
	*/
	var $index;

	/**
	* Reference to the (default) Format object for URLs
	* @var object Format
	*/
	var $_url_format;

	/**
	* Reference to the parser used for parsing formulas
	* @var object Format
	*/
	var $_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 rows for an Excel spreadsheet (BIFF5)
	* @var integer
	*/
	var $_xls_rowmax;

	/**
	* Maximum number of columns for an Excel spreadsheet (BIFF5)
	* @var integer
	*/
	var $_xls_colmax;

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

	/**
	* First row for the DIMENSIONS record
	* @var integer
	* @see _storeDimensions()
	*/
	var $_dim_rowmin;

	/**
	* Last row for the DIMENSIONS record
	* @var integer
	* @see _storeDimensions()
	*/
	var $_dim_rowmax;

	/**
	* First column for the DIMENSIONS record
	* @var integer
	* @see _storeDimensions()
	*/
	var $_dim_colmin;

	/**
	* Last column for the DIMENSIONS record
	* @var integer
	* @see _storeDimensions()
	*/
	var $_dim_colmax;

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

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

	/**
	* Array containing the panes for the worksheet
	* @var array
	*/
	var $_panes;

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

	/**
	* Bit specifying if panes are frozen
	* @var integer
	*/
	var $_frozen;

	/**
	* Bit specifying if the worksheet is selected
	* @var integer
	*/
	var $selected;

	/**
	* The paper size (for printing) (DOCUMENT!!!)
	* @var integer
	*/
	var $_paper_size;

	/**
	* Bit specifying paper orientation (for printing). 0 => landscape, 1 => portrait
	* @var integer
	*/
	var $_orientation;

	/**
	* The page header caption
	* @var string
	*/
	var $_header;

	/**
	* The page footer caption
	* @var string
	*/
	var $_footer;

	/**
	* The horizontal centering value for the page
	* @var integer
	*/
	var $_hcenter;

	/**
	* The vertical centering value for the page
	* @var integer
	*/
	var $_vcenter;

	/**
	* The margin for the header
	* @var float
	*/
	var $_margin_head;

	/**
	* The margin for the footer
	* @var float
	*/
	var $_margin_foot;

	/**
	* The left margin for the worksheet in inches
	* @var float
	*/
	var $_margin_left;

	/**
	* The right margin for the worksheet in inches
	* @var float
	*/
	var $_margin_right;

	/**
	* The top margin for the worksheet in inches
	* @var float
	*/
	var $_margin_top;

	/**
	* The bottom margin for the worksheet in inches
	* @var float
	*/
	var $_margin_bottom;

	/**
	* First row to reapeat on each printed page
	* @var integer
	*/
	var $title_rowmin;

	/**
	* Last row to reapeat on each printed page
	* @var integer
	*/
	var $title_rowmax;

	/**
	* First column to reapeat on each printed page
	* @var integer
	*/
	var $title_colmin;

	/**
	* First row of the area to print
	* @var integer
	*/
	var $print_rowmin;

	/**
	* Last row to of the area to print
	* @var integer
	*/
	var $print_rowmax;

	/**
	* First column of the area to print
	* @var integer
	*/
	var $print_colmin;

	/**
	* Last column of the area to print
	* @var integer
	*/
	var $print_colmax;

	/**
	* 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;

	/**
	* Outline row level.
	* @var integer
	*/
	var $_outline_row_level;

	/**
	* Whether to fit to page when printing or not.
	* @var bool
	*/
	var $_fit_page;

	/**
	* Number of pages to fit wide
	* @var integer
	*/
	var $_fit_width;

	/**
	* Number of pages to fit high
	* @var integer
	*/
	var $_fit_height;

	/**
	* 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;

	/**
	* Merged cell ranges
	* @var array
	*/
	var $_merged_ranges;

	/**
	* Charset encoding currently used when calling writeString()
	* @var string
	*/
	var $_input_encoding;
	
    /**
    * The temporary dir for storing files
    * @var string
    */
    var $_tmp_dir;
	
	/**
	* List of temporary files created
	* @var array
	*/
	var $_tempFilesCreated = array();

	/**
	* Constructor
	*
	* @param string  $name		 The name of the new worksheet
	* @param integer $index		The index of the new worksheet
	* @param mixed   &$activesheet The current activesheet of the workbook we belong to
	* @param mixed   &$firstsheet  The first worksheet in the workbook we belong to
	* @param mixed   &$url_format  The default format for hyperlinks
	* @param mixed   &$parser	  The formula parser created for the Workbook
	* @param string   $tempDir	  The temporary directory to be used
	* @access private
	*/
	function PHPExcel_Writer_Excel5_Worksheet($BIFF_version, $name,
												$index, &$activesheet,
												&$firstsheet, &$str_total,
												&$str_unique, &$str_table,
												&$url_format, &$parser, $tempDir = '')
	{
		// It needs to call its parent's constructor explicitly
		$this->PHPExcel_Writer_Excel5_BIFFwriter();
		$this->_BIFF_version	= $BIFF_version;
		$rowmax					= 65536; // 16384 in Excel 5
		$colmax					= 256;

		$this->name				= $name;
		$this->index			= $index;
		$this->activesheet		= &$activesheet;
		$this->firstsheet		= &$firstsheet;
		$this->_str_total		= &$str_total;
		$this->_str_unique		= &$str_unique;
		$this->_str_table		= &$str_table;
		$this->_url_format		= &$url_format;
		$this->_parser			= &$parser;

		//$this->ext_sheets		= array();
		$this->_filehandle		= '';
		$this->_using_tmpfile	= true;
		//$this->fileclosed		= 0;
		//$this->offset			= 0;
		$this->_xls_rowmax		= $rowmax;
		$this->_xls_colmax		= $colmax;
		$this->_xls_strmax		= 255;
		$this->_dim_rowmin		= $rowmax + 1;
		$this->_dim_rowmax		= 0;
		$this->_dim_colmin		= $colmax + 1;
		$this->_dim_colmax		= 0;
		$this->_colinfo			= array();
		$this->_selection		= array(0,0,0,0);
		$this->_panes			= array();
		$this->_active_pane		= 3;
		$this->_frozen			= 0;
		$this->selected			= 0;

		$this->_paper_size		= 0x0;
		$this->_orientation		= 0x1;
		$this->_header			= '';
		$this->_footer			= '';
		$this->_hcenter			= 0;
		$this->_vcenter			= 0;
		$this->_margin_head		= 0.50;
		$this->_margin_foot		= 0.50;
		$this->_margin_left		= 0.75;
		$this->_margin_right	= 0.75;
		$this->_margin_top		= 1.00;
		$this->_margin_bottom	= 1.00;

		$this->title_rowmin		= null;
		$this->title_rowmax		= null;
		$this->title_colmin		= null;
		$this->title_colmax		= null;
		$this->print_rowmin		= null;
		$this->print_rowmax		= null;
		$this->print_colmin		= null;
		$this->print_colmax		= null;

		$this->_print_gridlines		= 1;
		$this->_screen_gridlines	= 1;
		$this->_print_headers		= 0;

		$this->_fit_page		= 0;
		$this->_fit_width		= 0;
		$this->_fit_height		= 0;

		$this->_hbreaks			= array();
		$this->_vbreaks			= array();

		$this->_protect			= 0;
		$this->_password		= null;

		$this->col_sizes		= array();
		$this->_row_sizes		= array();

		$this->_zoom			= 100;
		$this->_print_scale		= 100;

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

		$this->_merged_ranges	= array();

		$this->_input_encoding	= '';

		$this->_dv				= array();

		$this->_tmp_dir			= $tempDir;
		
		$this->_initialize();
	}
	
	/**
	 * 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;
		}
	}
	
    /**
    * Sets the temp dir used for storing files
    *
    * @access public
    * @param string $dir The dir to be used as temp dir
    * @return true if given dir is valid, false otherwise
    */
    function setTempDir($dir)
    {
        if (is_dir($dir)) {
            $this->_tmp_dir = $dir;
            return true;
        }
        return 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()
	* @param array $sheetnames The array of sheetnames from the Workbook this
	*						  worksheet belongs to
	*/
	function close($sheetnames)
	{
		$num_sheets = count($sheetnames);

		/***********************************************
		* Prepend in reverse order!!
		*/

		// Prepend the sheet dimensions
		$this->_storeDimensions();

		// Prepend the sheet password
		$this->_storePassword();

		// Prepend the sheet protection
		$this->_storeProtect();

		// Prepend the page setup
		$this->_storeSetup();

		/* FIXME: margins are actually appended */
		// Prepend the bottom margin
		$this->_storeMarginBottom();

		// Prepend the top margin
		$this->_storeMarginTop();

		// Prepend the right margin
		$this->_storeMarginRight();

		// Prepend the left margin
		$this->_storeMarginLeft();

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

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

		// Prepend the page footer
		$this->_storeFooter();

		// Prepend the page header
		$this->_storeHeader();

		// Prepend the vertical page breaks
		$this->_storeVbreak();

		// Prepend the horizontal page breaks
		$this->_storeHbreak();

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

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

		 //  Prepend GUTS
		if ($this->_BIFF_version == 0x0500) {
			$this->_storeGuts();
		}

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

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

		// Prepend EXTERNSHEET references
		if ($this->_BIFF_version == 0x0500) {
			for ($i = $num_sheets; $i > 0; $i--) {
				$sheetname = $sheetnames[$i-1];
				$this->_storeExternsheet($sheetname);
			}
		}

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

		// Prepend 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]);
			}
			$this->_storeDefcol();
		}

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

		/*
		* End of prepend. Read upwards from here.
		***********************************************/

		// Append
		$this->_storeWindow2();
		$this->_storeZoom();
		if (!empty($this->_panes)) {
			$this->_storePanes($this->_panes);
		}
		$this->_storeSelection($this->_selection);
		$this->_storeMergedCells();
		/* TODO: add data validity */
		/*if ($this->_BIFF_version == 0x0600) {
			$this->_storeDataValidity();
		}*/
		$this->_storeEof();
	}

	/**
	* Retrieve the worksheet name.
	* This is usefull when creating worksheets without a name.
	*
	* @access public
	* @return string The worksheet's name
	*/
	function getName()
	{
		return $this->name;
	}

	/**
	* 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 '';
	}

	/**
	* Sets a merged cell range
	*
	* @access public
	* @param integer $first_row First row of the area to merge
	* @param integer $first_col First column of the area to merge
	* @param integer $last_row  Last row of the area to merge
	* @param integer $last_col  Last column of the area to merge
	*/
	function setMerge($first_row, $first_col, $last_row, $last_col)
	{
		if (($last_row < $first_row) || ($last_col < $first_col)) {
			return;
		}
		// don't check rowmin, rowmax, etc... because we don't know when this
		// is going to be called
		$this->_merged_ranges[] = array($first_row, $first_col, $last_row, $last_col);
	}

	/**
	* Set this worksheet as a selected worksheet,
	* i.e. the worksheet has its tab highlighted.
	*
	* @access public
	*/
	function select()
	{
		$this->selected = 1;
	}

	/**
	* Set this worksheet as the active worksheet,
	* i.e. the worksheet that is displayed when the workbook is opened.
	* Also set it as selected.
	*
	* @access public
	*/
	function activate()
	{
		$this->selected = 1;
		$this->activesheet = $this->index;
	}

	/**
	* Set this worksheet as the first visible sheet.
	* This is necessary when there are a large number of worksheets and the
	* activated worksheet is not visible on the screen.
	*
	* @access public
	*/
	function setFirstSheet()
	{
		$this->firstsheet = $this->index;
	}

	/**
	* Set the worksheet protection flag
	* to prevent accidental modification and to
	* hide formulas if the locked and hidden format properties have been set.
	*
	* @access public
	* @param string $password The password to use for protecting the sheet.
	*/
	function protect($password, $encoded = false)
	{
		$this->_protect   = 1;
		$this->_password  = ($encoded ? $password : $this->_encodePassword($password));
	}

	/**
	* Set the width of a single column or a range of columns.
	*
	* @access public
	* @param integer $firstcol first column on the range
	* @param integer $lastcol  last column on the range
	* @param integer $width	width to set
	* @param mixed   $format   The optional XF format to apply to the columns
	* @param integer $hidden   The optional hidden atribute
	* @param integer $level	The optional outline level
	*/
	function setColumn($firstcol, $lastcol, $width, $format = null, $hidden = 0, $level = 0)
	{
		$this->_colinfo[] = array($firstcol, $lastcol, $width, &$format, $hidden, $level);

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

		for ($col = $firstcol; $col <= $lastcol; $col++) {
			$this->col_sizes[$col] = $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 panes and mark them as frozen.
	*
	* @access public
	* @param array $panes This is the only parameter received and is composed of the following:
	*					 0 => Vertical split position,
	*					 1 => Horizontal split position
	*					 2 => Top row visible
	*					 3 => Leftmost column visible
	*					 4 => Active pane
	*/
	function freezePanes($panes)
	{
		$this->_frozen = 1;
		$this->_panes  = $panes;
	}

	/**
	* Set panes and mark them as unfrozen.
	*
	* @access public
	* @param array $panes This is the only parameter received and is composed of the following:
	*					 0 => Vertical split position,
	*					 1 => Horizontal split position
	*					 2 => Top row visible
	*					 3 => Leftmost column visible
	*					 4 => Active pane
	*/
	function thawPanes($panes)
	{
		$this->_frozen = 0;
		$this->_panes  = $panes;
	}

	/**
	* Set the page orientation as portrait.
	*
	* @access public
	*/
	function setPortrait()
	{
		$this->_orientation = 1;
	}

	/**
	* Set the page orientation as landscape.
	*
	* @access public
	*/
	function setLandscape()
	{
		$this->_orientation = 0;
	}

	/**
	* Set the paper type. Ex. 1 = US Letter, 9 = A4
	*
	* @access public
	* @param integer $size The type of paper size to use
	*/
	function setPaper($size = 0)
	{
		$this->_paper_size = $size;
	}


	/**
	* Set the page header caption and optional margin.
	*
	* @access public
	* @param string $string The header text
	* @param float  $margin optional head margin in inches.
	*/
	function setHeader($string,$margin = 0.50)
	{
		if (strlen($string) >= 255) {
			//carp 'Header string must be less than 255 characters';
			return;
		}
		$this->_header	  = $string;
		$this->_margin_head = $margin;
	}

	/**
	* Set the page footer caption and optional margin.
	*
	* @access public
	* @param string $string The footer text
	* @param float  $margin optional foot margin in inches.
	*/
	function setFooter($string,$margin = 0.50)
	{
		if (strlen($string) >= 255) {
			//carp 'Footer string must be less than 255 characters';
			return;
		}
		$this->_footer	  = $string;
		$this->_margin_foot = $margin;
	}

	/**
	* Center the page horinzontally.
	*
	* @access public
	* @param integer $center the optional value for centering. Defaults to 1 (center).
	*/
	function centerHorizontally($center = 1)
	{
		$this->_hcenter = $center;
	}

	/**
	* Center the page vertically.
	*
	* @access public
	* @param integer $center the optional value for centering. Defaults to 1 (center).
	*/
	function centerVertically($center = 1)
	{
		$this->_vcenter = $center;
	}

	/**
	* Set all the page margins to the same value in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMargins($margin)
	{
		$this->setMarginLeft($margin);
		$this->setMarginRight($margin);
		$this->setMarginTop($margin);
		$this->setMarginBottom($margin);
	}

	/**
	* Set the left and right margins to the same value in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMargins_LR($margin)
	{
		$this->setMarginLeft($margin);
		$this->setMarginRight($margin);
	}

	/**
	* Set the top and bottom margins to the same value in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMargins_TB($margin)
	{
		$this->setMarginTop($margin);
		$this->setMarginBottom($margin);
	}

	/**
	* Set the left margin in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMarginLeft($margin = 0.75)
	{
		$this->_margin_left = $margin;
	}

	/**
	* Set the right margin in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMarginRight($margin = 0.75)
	{
		$this->_margin_right = $margin;
	}

	/**
	* Set the top margin in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMarginTop($margin = 1.00)
	{
		$this->_margin_top = $margin;
	}

	/**
	* Set the bottom margin in inches.
	*
	* @access public
	* @param float $margin The margin to set in inches
	*/
	function setMarginBottom($margin = 1.00)
	{
		$this->_margin_bottom = $margin;
	}

	/**
	* Set the rows to repeat at the top of each printed page.
	*
	* @access public
	* @param integer $first_row First row to repeat
	* @param integer $last_row  Last row to repeat. Optional.
	*/
	function repeatRows($first_row, $last_row = null)
	{
		$this->title_rowmin  = $first_row;
		if (isset($last_row)) { //Second row is optional
			$this->title_rowmax  = $last_row;
		} else {
			$this->title_rowmax  = $first_row;
		}
	}

	/**
	* Set the columns to repeat at the left hand side of each printed page.
	*
	* @access public
	* @param integer $first_col First column to repeat
	* @param integer $last_col  Last column to repeat. Optional.
	*/
	function repeatColumns($first_col, $last_col = null)
	{
		$this->title_colmin  = $first_col;
		if (isset($last_col)) { // Second col is optional
			$this->title_colmax  = $last_col;
		} else {
			$this->title_colmax  = $first_col;
		}
	}

	/**
	* Set the area of each worksheet that will be printed.
	*
	* @access public
	* @param integer $first_row First row of the area to print
	* @param integer $first_col First column of the area to print
	* @param integer $last_row  Last row of the area to print
	* @param integer $last_col  Last column of the area to print
	*/
	function printArea($first_row, $first_col, $last_row, $last_col)
	{
		$this->print_rowmin  = $first_row;
		$this->print_colmin  = $first_col;
		$this->print_rowmax  = $last_row;
		$this->print_colmax  = $last_col;
	}


	/**
	* Set the option to hide gridlines on the printed page.
	*
	* @access public
	*/
	function hideGridlines()
	{
		$this->_print_gridlines = 0;
	}

	/**
	* Set the option to hide gridlines on the worksheet (as seen on the screen).
	*
	* @access public
	*/
	function hideScreenGridlines()
	{
		$this->_screen_gridlines = 0;
	}

	/**
	* 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;
	}

	/**
	* Set the vertical and horizontal number of pages that will define the maximum area printed.
	* It doesn't seem to work with OpenOffice.
	*
	* @access public
	* @param  integer $width  Maximun width of printed area in pages
	* @param  integer $height Maximun heigth of printed area in pages
	* @see setPrintScale()
	*/
	function fitToPages($width, $height)
	{
		$this->_fit_page	  = 1;
		$this->_fit_width	 = $width;
		$this->_fit_height	= $height;
	}

	/**
	* Store the horizontal page breaks on a worksheet (for printing).
	* The breaks represent the row after which the break is inserted.
	*
	* @access public
	* @param array $breaks Array containing the horizontal page breaks
	*/
	function setHPagebreaks($breaks)
	{
		foreach ($breaks as $break) {
			array_push($this->_hbreaks, $break);
		}
	}

	/**
	* Store the vertical page breaks on a worksheet (for printing).
	* The breaks represent the column after which the break is inserted.
	*
	* @access public
	* @param array $breaks Array containing the vertical page breaks
	*/
	function setVPagebreaks($breaks)
	{
		foreach ($breaks as $break) {
			array_push($this->_vbreaks, $break);
		}
	}


	/**
	* Set the worksheet zoom factor.
	*
	* @access public
	* @param integer $scale The zoom factor
	*/
	function setZoom($scale = 100)
	{
		// Confine the scale to Excel's range
		if ($scale < 10 || $scale > 400) {
			throw new Exception("Zoom factor $scale outside range: 10 <= zoom <= 400");
			$scale = 100;
		}

		$this->_zoom = floor($scale);
	}

	/**
	* Set the scale factor for the printed page.
	* It turns off the "fit to page" option
	*
	* @access public
	* @param integer $scale The optional scale factor. Defaults to 100
	*/
	function setPrintScale($scale = 100)
	{
		// Confine the scale to Excel's range
		if ($scale < 10 || $scale > 400) {
			throw new Exception("Print scale $scale outside range: 10 <= zoom <= 400");
			$scale = 100;
		}

		// Turn off "fit to page" option
		$this->_fit_page = 0;

		$this->_print_scale = floor($scale);
	}

	/**
	* Map to the appropriate write method acording to the token recieved.
	*
	* @access public
	* @param integer $row	The row of the cell we are writing to
	* @param integer $col	The column of the cell we are writing to
	* @param mixed   $token  What we are writing
	* @param mixed   $format The optional format to apply to the cell
	*/
	function write($row, $col, $token, $format = null, $numberFormat = null)
	{
		// Check for a cell reference in A1 notation and substitute row and column
		/*if ($_[0] =~ /^\D/) {
			@_ = $this->_substituteCellref(@_);
		}*/

		if (($numberFormat != 'General') && (PHPExcel_Shared_Date::isDateTimeFormatCode($numberFormat))) {
			if (is_string($token)) {
				//	Error string
				return $this->writeString($row, $col, $token, $format);
			} elseif (!is_float($token)) {
				//	PHP serialized date/time or date/time object
				return $this->writeNumber($row, $col, PHPExcel_Shared_Date::PHPToExcel($token), $format);
			} else {
				//	Excel serialized date/time
				return $this->writeNumber($row, $col, $token, $format);
			}
		} elseif (preg_match("/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/", $token)) {
			// Match number
			return $this->writeNumber($row, $col, $token, $format);
		} elseif (preg_match("/^[fh]tt?p:\/\//", $token)) {
			// Match http or ftp URL
			return $this->writeUrl($row, $col, $token, '', $format);
		} elseif (preg_match("/^mailto:/", $token)) {
			// Match mailto:
			return $this->writeUrl($row, $col, $token, '', $format);
		} elseif (preg_match("/^(?:in|ex)ternal:/", $token)) {
			// Match internal or external sheet link
			return $this->writeUrl($row, $col, $token, '', $format);
		} elseif (preg_match("/^=/", $token)) {
			// Match formula
			return $this->writeFormula($row, $col, $token, $format);
		} elseif (preg_match("/^@/", $token)) {
			// Match formula
			return $this->writeFormula($row, $col, $token, $format);
		} elseif ($token == '') {
			// Match blank
			return $this->writeBlank($row, $col, $format);
		} else {
			// Default: match string
			return $this->writeString($row, $col, $token, $format);
		}
	}

	/**
	* Write an array of values as a row
	*
	* @access public
	* @param integer $row	The row we are writing to
	* @param integer $col	The first col (leftmost col) we are writing to
	* @param array   $val	The array of values to write
	* @param mixed   $format The optional format to apply to the cell
	*/

	function writeRow($row, $col, $val, $format = null, $numberFormat = null)
	{
		$retval = '';
		if (is_array($val)) {
			foreach ($val as $v) {
				if (is_array($v)) {
					$this->writeCol($row, $col, $v, $format, $numberFormat = null);
				} else {
					$this->write($row, $col, $v, $format, $numberFormat);
				}
				$col++;
			}
		} else {
			throw new Exception('$val needs to be an array');
		}
		return($retval);
	}

	/**
	* Write an array of values as a column
	*
	* @access public
	* @param integer $row	The first row (uppermost row) we are writing to
	* @param integer $col	The col we are writing to
	* @param array   $val	The array of values to write
	* @param mixed   $format The optional format to apply to the cell
	*/

	function writeCol($row, $col, $val, $format = null, $numberFormat = null)
	{
		$retval = '';
		if (is_array($val)) {
			foreach ($val as $v) {
				$this->write($row, $col, $v, $format, $numberFormat);
				$row++;
			}
		} else {
			throw new Exception('$val needs to be an array');
		}
		return($retval);
	}

	/**
	* Returns an index to the XF record in the workbook
	*
	* @access private
	* @param mixed &$format The optional XF format
	* @return integer The XF record index
	*/
	function _XF(&$format)
	{
		if ($format) {
			return($format->getXfIndex());
		} else {
			return(0x0F);
		}
	}


	/******************************************************************************
	*******************************************************************************
	*
	* Internal methods
	*/


	/**
	* 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) > $this->_limit) {
				$data = $this->_addContinue($data);
			}
			fwrite($this->_filehandle, $data);
			$this->_datasize += strlen($data);
		} else {
			parent::_append($data);
		}
	}

	/**
	* Substitute an Excel cell reference in A1 notation for  zero based row and
	* column values in an argument list.
	*
	* Ex: ("A4", "Hello") is converted to (3, 0, "Hello").
	*
	* @access private
	* @param string $cell The cell reference. Or range of cells.
	* @return array
	*/
	function _substituteCellref($cell)
	{
		$cell = strtoupper($cell);

		// Convert a column range: 'A:A' or 'B:G'
		if (preg_match("/([A-I]?[A-Z]):([A-I]?[A-Z])/", $cell, $match)) {
			list($no_use, $col1) =  $this->_cellToRowcol($match[1] .'1'); // Add a dummy row
			list($no_use, $col2) =  $this->_cellToRowcol($match[2] .'1'); // Add a dummy row
			return(array($col1, $col2));
		}

		// Convert a cell range: 'A1:B7'
		if (preg_match("/\$?([A-I]?[A-Z]\$?\d+):\$?([A-I]?[A-Z]\$?\d+)/", $cell, $match)) {
			list($row1, $col1) =  $this->_cellToRowcol($match[1]);
			list($row2, $col2) =  $this->_cellToRowcol($match[2]);
			return(array($row1, $col1, $row2, $col2));
		}

		// Convert a cell reference: 'A1' or 'AD2000'
		if (preg_match("/\$?([A-I]?[A-Z]\$?\d+)/", $cell)) {
			list($row1, $col1) =  $this->_cellToRowcol($match[1]);
			return(array($row1, $col1));
		}

		// TODO use real error codes
		throw new Exception("Unknown cell reference $cell");
	}

	/**
	* Convert an Excel cell reference in A1 notation to a zero based row and column
	* reference; converts C1 to (0, 2).
	*
	* @access private
	* @param string $cell The cell reference.
	* @return array containing (row, column)
	*/
	function _cellToRowcol($cell)
	{
		preg_match("/\$?([A-I]?[A-Z])\$?(\d+)/",$cell,$match);
		$col	 = $match[1];
		$row	 = $match[2];

		// Convert base26 column string to number
		$chars = split('', $col);
		$expn  = 0;
		$col   = 0;

		while ($chars) {
			$char = array_pop($chars);		// LS char first
			$col += (ord($char) -ord('A') +1) * pow(26,$expn);
			$expn++;
		}

		// Convert 1-index to zero-index
		$row--;
		$col--;

		return(array($row, $col));
	}

	/**
	* Based on the algorithm provided by Daniel Rentz of OpenOffice.
	*
	* @access private
	* @param string $plaintext The password to be encoded in plaintext.
	* @return string The encoded password
	*/
	function _encodePassword($plaintext)
	{
		$password = 0x0000;
		$i		= 1;	   // char position

		// split the plain text password in its component characters
		$chars = preg_split('//', $plaintext, -1, PREG_SPLIT_NO_EMPTY);
		foreach ($chars as $char) {
			$value		= ord($char) << $i;   // shifted ASCII value
			$rotated_bits = $value >> 15;	   // rotated bits beyond bit 15
			$value	   &= 0x7fff;			 // first 15 bits
			$password	^= ($value | $rotated_bits);
			$i++;
		}

		$password ^= strlen($plaintext);
		$password ^= 0xCE4B;

		return($password);
	}

	/**
	* 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;
		}
	 }

	/******************************************************************************
	*******************************************************************************
	*
	* BIFF RECORDS
	*/


	/**
	* 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
	*
	* @access public
	* @param integer $row	Zero indexed row
	* @param integer $col	Zero indexed column
	* @param float   $num	The number to write
	* @param mixed   $format The optional XF format
	* @return integer
	*/
	function writeNumber($row, $col, $num, $format = null)
	{
		$record	= 0x0203;				 // Record identifier
		$length	= 0x000E;				 // Number of bytes to follow

		$xf		= $this->_XF($format);	// The cell format

		// Check that row and col are valid and store max and min values
		if ($row >= $this->_xls_rowmax) {
			return(-2);
		}
		if ($col >= $this->_xls_colmax) {
			return(-2);
		}
		if ($row <  $this->_dim_rowmin)  {
			$this->_dim_rowmin = $row;
		}
		if ($row >  $this->_dim_rowmax)  {
			$this->_dim_rowmax = $row;
		}
		if ($col <  $this->_dim_colmin)  {
			$this->_dim_colmin = $col;
		}
		if ($col >  $this->_dim_colmax)  {
			$this->_dim_colmax = $col;
		}

		$header	= pack("vv",  $record, $length);
		$data	  = pack("vvv", $row, $col, $xf);
		$xl_double = pack("d",   $num);
		if ($this->_byte_order) { // if it's Big Endian
			$xl_double = strrev($xl_double);
		}

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

	/**
	* 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   $format The XF format for the cell
	* @return integer
	*/
	function writeString($row, $col, $str, $format = null)
	{
		if ($this->_BIFF_version == 0x0600) {
			return $this->writeStringBIFF8($row, $col, $str, $format);
		}
		$strlen	= strlen($str);
		$record	= 0x0204;				   // Record identifier
		$length	= 0x0008 + $strlen;		 // Bytes to follow
		$xf		= $this->_XF($format);	  // The cell format

		$str_error = 0;

		// Check that row and col are valid and store max and min values
		if ($row >= $this->_xls_rowmax) {
			return(-2);
		}
		if ($col >= $this->_xls_colmax) {
			return(-2);
		}
		if ($row <  $this->_dim_rowmin) {
			$this->_dim_rowmin = $row;
		}
		if ($row >  $this->_dim_rowmax) {
			$this->_dim_rowmax = $row;
		}
		if ($col <  $this->_dim_colmin) {
			$this->_dim_colmin = $col;
		}
		if ($col >  $this->_dim_colmax) {
			$this->_dim_colmax = $col;
		}

		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, $xf, $strlen);
		$this->_append($header . $data . $str);
		return($str_error);
	}

	var $_biff8_input_encoding = 'UTF-16LE';
	function setBIFF8InputEncoding($encoding) {
		if ($encoding != 'UTF-16LE' && !function_exists('iconv')) {
			$this->raiseError("Using an input encoding other than UTF-16LE requires PHP support for iconv");
		}
		$this->_biff8_input_encoding = $encoding;
	}

	/**
	* Sets Input Encoding for writing strings
	*
	* @access public
	* @param string $encoding The encoding. Ex: 'UTF-16LE', 'utf-8', 'ISO-859-7'
	*/
	function setInputEncoding($encoding)
	{
		 if ($encoding != 'UTF-16LE' && !function_exists('iconv')) {
			 throw new Exception("Using an input encoding other than UTF-16LE requires PHP support for iconv");
		 }
		 $this->_input_encoding = $encoding;
	}

	/**
	* 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   $format The XF format for the cell
	* @return integer
	*/
	function writeStringBIFF8($row, $col, $str, $format = null)
	{
		if ($this->_input_encoding == 'UTF-16LE')
		{
			$strlen = function_exists('mb_strlen') ? mb_strlen($str, 'UTF-16LE') : (strlen($str) / 2);
			$encoding  = 0x1;
		}
		elseif ($this->_input_encoding != '')
		{
			$str = iconv($this->_input_encoding, 'UTF-16LE', $str);
			$strlen = function_exists('mb_strlen') ? mb_strlen($str, 'UTF-16LE') : (strlen($str) / 2);
			$encoding  = 0x1;
		}
		else
		{
			$strlen	= strlen($str);
			$encoding  = 0x0;
		}
		$record	= 0x00FD;				   // Record identifier
		$length	= 0x000A;				   // Bytes to follow
		$xf		= $this->_XF($format);	  // The cell format

		$str_error = 0;

		// Check that row and col are valid and store max and min values
		if ($this->_checkRowCol($row, $col) == false) {
			return -2;
		}

		$str = pack('vC', $strlen, $encoding).$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, $xf, $this->_str_table[$str]);
		$this->_append($header.$data);
		return $str_error;
	}

	/**
	* Check row and col before writing to a cell, and update the sheet's
	* dimensions accordingly
	*
	* @access private
	* @param integer $row	Zero indexed row
	* @param integer $col	Zero indexed column
	* @return boolean true for success, false if row and/or col are grester
	*				 then maximums allowed.
	*/
	function _checkRowCol($row, $col)
	{
		if ($row >= $this->_xls_rowmax) {
			return false;
		}
		if ($col >= $this->_xls_colmax) {
			return false;
		}
		if ($row <  $this->_dim_rowmin) {
			$this->_dim_rowmin = $row;
		}
		if ($row >  $this->_dim_rowmax) {
			$this->_dim_rowmax = $row;
		}
		if ($col <  $this->_dim_colmin) {
			$this->_dim_colmin = $col;
		}
		if ($col >  $this->_dim_colmax) {
			$this->_dim_colmax = $col;
		}
		return true;
	}

	/**
	* Writes a note associated with the cell given by the row and column.
	* NOTE records don't have a length limit.
	*
	* @access public
	* @param integer $row	Zero indexed row
	* @param integer $col	Zero indexed column
	* @param string  $note   The note to write
	*/
	function writeNote($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

		// Check that row and col are valid and store max and min values
		if ($row >= $this->_xls_rowmax) {
			return(-2);
		}
		if ($col >= $this->_xls_colmax) {
			return(-2);
		}
		if ($row <  $this->_dim_rowmin) {
			$this->_dim_rowmin = $row;
		}
		if ($row >  $this->_dim_rowmax) {
			$this->_dim_rowmax = $row;
		}
		if ($col <  $this->_dim_colmin) {
			$this->_dim_colmin = $col;
		}
		if ($col >  $this->_dim_colmax) {
			$this->_dim_colmax = $col;
		}

		// 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
	*
	* @access public
	* @param integer $row	Zero indexed row
	* @param integer $col	Zero indexed column
	* @param mixed   $format The XF format
	*/
	function writeBlank($row, $col, $format)
	{
		// Don't write a blank cell unless it has a format
		if (!$format) {
			return(0);
		}

		$record	= 0x0201;				 // Record identifier
		$length	= 0x0006;				 // Number of bytes to follow
		$xf		= $this->_XF($format);	// The cell format

		// Check that row and col are valid and store max and min values
		if ($row >= $this->_xls_rowmax) {
			return(-2);
		}
		if ($col >= $this->_xls_colmax) {
			return(-2);
		}
		if ($row <  $this->_dim_rowmin) {
			$this->_dim_rowmin = $row;
		}
		if ($row >  $this->_dim_rowmax) {
			$this->_dim_rowmax = $row;
		}
		if ($col <  $this->_dim_colmin) {
			$this->_dim_colmin = $col;
		}
		if ($col >  $this->_dim_colmax) {
			$this->_dim_colmax = $col;
		}

		$header	= pack("vv",  $record, $length);
		$data	  = pack("vvv", $row, $col, $xf);
		$this->_append($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
	*
	* @access public
	* @param integer $row	 Zero indexed row
	* @param integer $col	 Zero indexed column
	* @param string  $formula The formula text string
	* @param mixed   $format  The optional XF format
	* @return integer
	*/
	function writeFormula($row, $col, $formula, $format = null)
	{
		$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.
		//
		$xf		= $this->_XF($format); // The cell format
		$num	   = 0x00;				// Current value of formula
		$grbit	 = 0x03;				// Option flags
		$unknown   = 0x0000;			  // Must be zero


		// Check that row and col are valid and store max and min values
		if ($this->_checkRowCol($row, $col) == false) {
			return -2;
		}

		// 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
		$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, $xf, $num,
									 $grbit, $unknown, $formlen);

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

	/**
	* 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
	*
	* @access public
	* @param integer $row	Row
	* @param integer $col	Column
	* @param string  $url	URL string
	* @param string  $string Alternative label
	* @param mixed   $format The cell format
	* @return integer
	*/
	function writeUrl($row, $col, $url, $string = '', $format = null)
	{
		// Add start row and col to arg list
		return($this->_writeUrlRange($row, $col, $row, $col, $url, $string, $format));
	}

	/**
	* 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
	* @param string  $string Alternative label
	* @param mixed   $format The cell format
	* @return integer
	*/

	function _writeUrlRange($row1, $col1, $row2, $col2, $url, $string = '', $format = null)
	{

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


	/**
	* 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
	* @param string  $str	Alternative label
	* @param mixed   $format The cell format
	* @return integer
	*/
	function _writeUrlWeb($row1, $col1, $row2, $col2, $url, $str, $format = null)
	{
		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		if (!$format) {
			$format = $this->_url_format;
		}

		// Write the visible label using the writeString() method.
		if ($str == '') {
			$str = $url;
		}
		$str_error = $this->writeString($row1, $col1, $str, $format);
		if (($str_error == -2) || ($str_error == -3)) {
			return $str_error;
		}

		// 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 . $url);
		return($str_error);
	}

	/**
	* 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
	* @param string  $str	Alternative label
	* @param mixed   $format The cell format
	* @return integer
	*/
	function _writeUrlInternal($row1, $col1, $row2, $col2, $url, $str, $format = null)
	{
		$record	  = 0x01B8;					   // Record identifier
		$length	  = 0x00000;					  // Bytes to follow

		if (!$format) {
			$format = $this->_url_format;
		}

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

		// Write the visible label
		if ($str == '') {
			$str = $url;
		}
		$str_error = $this->writeString($row1, $col1, $str, $format);
		if (($str_error == -2) || ($str_error == -3)) {
			return $str_error;
		}

		// 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		 = join("\0", preg_split(…