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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:

*

*    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

*/

require_once('Format.php');

require_once('OLEwriter.php');

require_once('BIFFwriter.php');

require_once('Worksheet.php');

require_once('Parser.php');

/**

* Class for generating Excel Spreadsheets

*

* @author   Xavier Noguer <xnoguer@rezebra.com>

* @category FileFormats

* @package  Spreadsheet_Excel_Writer

*/

class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwriter

{

    /**

    * Filename for the Workbook

    * @var string

    */

    var $_filename;

    /**

    * Formula parser

    * @var object Parser

    */

    var $_parser;

    /**

    * Flag for 1904 date system

    * @var integer

    */

    var $_1904;

    /**

    * The active worksheet of the workbook (0 indexed)

    * @var integer

    */

    var $_activesheet;

    /**

    * 1st displayed worksheet in the workbook (0 indexed)

    * @var integer

    */

    var $_firstsheet;

    /**

    * Number of workbook tabs selected

    * @var integer

    */

    var $_selected;

    /**

    * Index for creating adding new formats to the workbook

    * @var integer

    */

    var $_xf_index;

    /**

    * Flag for preventing close from being called twice.

    * @var integer

    * @see close()

    */

    var $_fileclosed;

    /**

    * The BIFF file size for the workbook.

    * @var integer

    * @see _calcSheetOffsets()

    */

    var $_biffsize;

    /**

    * The default sheetname for all sheets created.

    * @var string

    */

    var $_sheetname;

    /**

    * The default XF format.

    * @var object Format

    */

    var $_tmp_format;

    /**

    * Array containing references to all of this workbook's worksheets

    * @var array

    */

    var $_worksheets;

    /**

    * Array of sheetnames for creating the EXTERNSHEET records

    * @var array

    */

    var $_sheetnames;

    /**

    * Array containing references to all of this workbook's formats

    * @var array

    */

    var $_formats;

    /**

    * Array containing the colour palette

    * @var array

    */

    var $_palette;

    /**

    * The default format for URLs.

    * @var object Format

    */

    var $_url_format;

    /**

    * Class constructor

    *

    * @param string filename for storing the workbook. "-" for writing to stdout.

    * @access public

    */

    function Spreadsheet_Excel_Writer_Workbook($filename)

    {

        // It needs to call its parent's constructor explicitly

        $this->Spreadsheet_Excel_Writer_BIFFwriter();

        $this->_filename         = $filename;

        $this->_parser           =& new Spreadsheet_Excel_Writer_Parser($this->_byte_order);

        $this->_1904             = 0;

        $this->_activesheet      = 0;

        $this->_firstsheet       = 0;

        $this->_selected         = 0;

        $this->_xf_index         = 16; // 15 style XF's and 1 cell XF.

        $this->_fileclosed       = 0;

        $this->_biffsize         = 0;

        $this->_sheetname        = "Sheet";

        $this->_tmp_format       =& new Spreadsheet_Excel_Writer_Format();

        $this->_worksheets       = array();

        $this->_sheetnames       = array();

        $this->_formats          = array();

        $this->_palette          = array();

        // Add the default format for hyperlinks

        $this->_url_format =& $this->addFormat(array('color' => 'blue', 'underline' => 1));

        $this->_setPaletteXl97();

    }

    /**

    * Calls finalization methods.

    * This method should always be the last one to be called on every workbook

    *

    * @access public

    */

    function close()

    {

        if ($this->_fileclosed) { // Prevent close() from being called twice.

            return;

        }

        $this->_storeWorkbook();

        $this->_fileclosed = 1;

    }

    /**

    * An accessor for the _worksheets[] array

    * Returns an array of the worksheet objects in a workbook

    * It actually calls to worksheets()

    *

    * @access public

    * @see worksheets()

    * @return array

    */

    function sheets()

    {

        return $this->worksheets();

    }

    /**

    * An accessor for the _worksheets[] array.

    * Returns an array of the worksheet objects in a workbook

    *

    * @access public

    * @return array

    */

    function worksheets()

    {

        return($this->_worksheets);

    }

    /**

    * Add a new worksheet to the Excel workbook.

    * If no name is given the name of the worksheet will be Sheeti$i, with

    * $i in [1..].

    *

    * @access public

    * @param string $name the optional name of the worksheet

    * @return &Spreadsheet_Excel_Writer_Worksheet reference to a worksheet object

    */

    function &addWorksheet($name = '')

    {

        $index     = count($this->_worksheets);

        $sheetname = $this->_sheetname;

        if($name == '') {

            $name = $sheetname.($index+1);

        }

        // Check that sheetname is <= 31 chars (Excel limit).

        if(strlen($name) > 31) {

            $this->raiseError("Sheetname $name must be <= 31 chars");

        }

        // Check that the worksheet name doesn't already exist: a fatal Excel error.

        for($i=0; $i < count($this->_worksheets); $i++)

        {

            if($name == $this->_worksheets[$i]->getName()) {

                $this->raiseError("Worksheet '$name' already exists");

            }

        }

        $worksheet = new Spreadsheet_Excel_Writer_Worksheet($name,$index,$this->_activesheet,

                                   $this->_firstsheet,$this->_url_format,

                                   $this->_parser);

        $this->_worksheets[$index] = &$worksheet;    // Store ref for iterator

        $this->_sheetnames[$index] = $name;          // Store EXTERNSHEET names

        $this->_parser->setExtSheet($name, $index);  // Register worksheet name with parser

        return($worksheet);

    }

    /**

    * Add a new format to the Excel workbook.

    * Also, pass any properties to the Format constructor.

    *

    * @access public

    * @param array $properties array with properties for initializing the format.

    * @return &Spreadsheet_Excel_Writer_Format reference to an Excel Format

    */

    function &addFormat($properties = array())

    {

        $format = new Spreadsheet_Excel_Writer_Format($this->_xf_index,$properties);

        $this->_xf_index += 1;

        $this->_formats[] = &$format;

        return($format);

    }

    /**

    * Change the RGB components of the elements in the colour palette.

    *

    * @access public

    * @param integer $index colour index

    * @param integer $red   red RGB value [0-255]

    * @param integer $green green RGB value [0-255]

    * @param integer $blue  blue RGB value [0-255]

    * @return integer The palette index for the custom color

    */

    function setCustomColor($index,$red,$green,$blue)

    {

        // Match a HTML #xxyyzz style parameter

        /*if (defined $_[1] and $_[1] =~ /^#(\w\w)(\w\w)(\w\w)/ ) {

            @_ = ($_[0], hex $1, hex $2, hex $3);

        }*/

        // Check that the colour index is the right range

        if ($index < 8 or $index > 64) {

            // TODO: assign real error codes

            $this->raiseError("Color index $index outside range: 8 <= index <= 64",0,PEAR_ERROR_DIE);

        }

        // Check that the colour components are in the right range

        if ( ($red   < 0 or $red   > 255) or

             ($green < 0 or $green > 255) or

             ($blue  < 0 or $blue  > 255) )

        {

            $this->raiseError("Color component outside range: 0 <= color <= 255");

        }

        $index -= 8; // Adjust colour index (wingless dragonfly)

        // Set the RGB value

        $this->_palette[$index] = array($red, $green, $blue, 0);

        return($index + 8);

    }

    /**

    * Sets the colour palette to the Excel 97+ default.

    *

    * @access private

    */

    function _setPaletteXl97()

    {

        $this->_palette = array(

                           array(0x00, 0x00, 0x00, 0x00),   // 8

                           array(0xff, 0xff, 0xff, 0x00),   // 9

                           array(0xff, 0x00, 0x00, 0x00),   // 10

                           array(0x00, 0xff, 0x00, 0x00),   // 11

                           array(0x00, 0x00, 0xff, 0x00),   // 12

                           array(0xff, 0xff, 0x00, 0x00),   // 13

                           array(0xff, 0x00, 0xff, 0x00),   // 14

                           array(0x00, 0xff, 0xff, 0x00),   // 15

                           array(0x80, 0x00, 0x00, 0x00),   // 16

                           array(0x00, 0x80, 0x00, 0x00),   // 17

                           array(0x00, 0x00, 0x80, 0x00),   // 18

                           array(0x80, 0x80, 0x00, 0x00),   // 19

                           array(0x80, 0x00, 0x80, 0x00),   // 20

                           array(0x00, 0x80, 0x80, 0x00),   // 21

                           array(0xc0, 0xc0, 0xc0, 0x00),   // 22

                           array(0x80, 0x80, 0x80, 0x00),   // 23

                           array(0x99, 0x99, 0xff, 0x00),   // 24

                           array(0x99, 0x33, 0x66, 0x00),   // 25

                           array(0xff, 0xff, 0xcc, 0x00),   // 26

                           array(0xcc, 0xff, 0xff, 0x00),   // 27

                           array(0x66, 0x00, 0x66, 0x00),   // 28

                           array(0xff, 0x80, 0x80, 0x00),   // 29

                           array(0x00, 0x66, 0xcc, 0x00),   // 30

                           array(0xcc, 0xcc, 0xff, 0x00),   // 31

                           array(0x00, 0x00, 0x80, 0x00),   // 32

                           array(0xff, 0x00, 0xff, 0x00),   // 33

                           array(0xff, 0xff, 0x00, 0x00),   // 34

                           array(0x00, 0xff, 0xff, 0x00),   // 35

                           array(0x80, 0x00, 0x80, 0x00),   // 36

                           array(0x80, 0x00, 0x00, 0x00),   // 37

                           array(0x00, 0x80, 0x80, 0x00),   // 38

                           array(0x00, 0x00, 0xff, 0x00),   // 39

                           array(0x00, 0xcc, 0xff, 0x00),   // 40

                           array(0xcc, 0xff, 0xff, 0x00),   // 41

                           array(0xcc, 0xff, 0xcc, 0x00),   // 42

                           array(0xff, 0xff, 0x99, 0x00),   // 43

                           array(0x99, 0xcc, 0xff, 0x00),   // 44

                           array(0xff, 0x99, 0xcc, 0x00),   // 45

                           array(0xcc, 0x99, 0xff, 0x00),   // 46

                           array(0xff, 0xcc, 0x99, 0x00),   // 47

                           array(0x33, 0x66, 0xff, 0x00),   // 48

                           array(0x33, 0xcc, 0xcc, 0x00),   // 49

                           array(0x99, 0xcc, 0x00, 0x00),   // 50

                           array(0xff, 0xcc, 0x00, 0x00),   // 51

                           array(0xff, 0x99, 0x00, 0x00),   // 52

                           array(0xff, 0x66, 0x00, 0x00),   // 53

                           array(0x66, 0x66, 0x99, 0x00),   // 54

                           array(0x96, 0x96, 0x96, 0x00),   // 55

                           array(0x00, 0x33, 0x66, 0x00),   // 56

                           array(0x33, 0x99, 0x66, 0x00),   // 57

                           array(0x00, 0x33, 0x00, 0x00),   // 58

                           array(0x33, 0x33, 0x00, 0x00),   // 59

                           array(0x99, 0x33, 0x00, 0x00),   // 60

                           array(0x99, 0x33, 0x66, 0x00),   // 61

                           array(0x33, 0x33, 0x99, 0x00),   // 62

                           array(0x33, 0x33, 0x33, 0x00),   // 63

                         );

    }

    /**

    * Assemble worksheets into a workbook and send the BIFF data to an OLE

    * storage.

    *

    * @access private

    */

    function _storeWorkbook()

    {

        // Ensure that at least one worksheet has been selected.

        if ($this->_activesheet == 0)

        {

            $this->_worksheets[0]->selected = 1;

        }

        // Calculate the number of selected worksheet tabs and call the finalization

        // methods for each worksheet

        for($i=0; $i < count($this->_worksheets); $i++)

        {

            if($this->_worksheets[$i]->selected) {

                $this->_selected++;

            }

            $this->_worksheets[$i]->close($this->_sheetnames);

        }

        // Add Workbook globals

        $this->_storeBof(0x0005);

        $this->_storeExterns();    // For print area and repeat rows

        $this->_storeNames();      // For print area and repeat rows

        $this->_storeWindow1();

        $this->_store1904();

        $this->_storeAllFonts();

        $this->_storeAllNumFormats();

        $this->_storeAllXfs();

        $this->_storeAllStyles();

        $this->_storePalette();

        $this->_calcSheetOffsets();

        // Add BOUNDSHEET records

        for($i=0; $i < count($this->_worksheets); $i++) {

            $this->_storeBoundsheet($this->_worksheets[$i]->name,$this->_worksheets[$i]->offset);

        }

        // End Workbook globals

        $this->_storeEof();

        // Store the workbook in an OLE container

        $this->_storeOLEFile();

    }

    /**

    * Store the workbook in an OLE container if the total size of the workbook data

    * is less than ~ 7MB.

    *

    * @access private

    */

    function _storeOLEFile()

    {

        $OLE  = new Spreadsheet_Excel_Writer_OLEwriter($this->_filename);

        $this->_tmp_filename = $OLE->_tmp_filename;

        // Write Worksheet data if data <~ 7MB

        if ($OLE->setSize($this->_biffsize))

        {

            $OLE->writeHeader();

            $OLE->write($this->_data);

            foreach($this->_worksheets as $sheet)

            {

                while ($tmp = $sheet->getData()) {

                    $OLE->write($tmp);

                }

            }

        }

        $OLE->close();

    }

    /**

    * Calculate offsets for Worksheet BOF records.

    *

    * @access private

    */

    function _calcSheetOffsets()

    {

        $BOF     = 11;

        $EOF     = 4;

        $offset  = $this->_datasize;

        for($i=0; $i < count($this->_worksheets); $i++) {

            $offset += $BOF + strlen($this->_worksheets[$i]->name);

        }

        $offset += $EOF;

        for($i=0; $i < count($this->_worksheets); $i++) {

            $this->_worksheets[$i]->offset = $offset;

            $offset += $this->_worksheets[$i]->_datasize;

        }

        $this->_biffsize = $offset;

    }

    /**

    * Store the Excel FONT records.

    *

    * @access private

    */

    function _storeAllFonts()

    {

        // tmp_format is added by the constructor. We use this to write the default XF's

        $format = $this->_tmp_format;

        $font   = $format->getFont();

        // Note: Fonts are 0-indexed. According to the SDK there is no index 4,

        // so the following fonts are 0, 1, 2, 3, 5

        //

        for($i=1; $i <= 5; $i++){

            $this->_append($font);

        }

        // Iterate through the XF objects and write a FONT record if it isn't the

        // same as the default FONT and if it hasn't already been used.

        //

        $fonts = array();

        $index = 6;                  // The first user defined FONT

        $key = $format->getFontKey(); // The default font from _tmp_format

        $fonts[$key] = 0;               // Index of the default font

        for($i=0; $i < count($this->_formats); $i++) {

            $key = $this->_formats[$i]->getFontKey();

            if (isset($fonts[$key])) {

                // FONT has already been used

                $this->_formats[$i]->font_index = $fonts[$key];

            }

            else {

                // Add a new FONT record

                $fonts[$key]        = $index;

                $this->_formats[$i]->font_index = $index;

                $index++;

                $font = $this->_formats[$i]->getFont();

                $this->_append($font);

            }

        }

    }

    /**

    * Store user defined numerical formats i.e. FORMAT records

    *

    * @access private

    */

    function _storeAllNumFormats()

    {

        // Leaning num_format syndrome

        $hash_num_formats = array();

        $num_formats      = array();

        $index = 164;

        // Iterate through the XF objects and write a FORMAT record if it isn't a

        // built-in format type and if the FORMAT string hasn't already been used.

        //

        for($i=0; $i < count($this->_formats); $i++)

        {

            $num_format = $this->_formats[$i]->_num_format;

            // Check if $num_format is an index to a built-in format.

            // Also check for a string of zeros, which is a valid format string

            // but would evaluate to zero.

            //

            if (!preg_match("/^0+\d/",$num_format))

            {

                if (preg_match("/^\d+$/",$num_format)) { // built-in format

                    continue;

                }

            }

            if (isset($hash_num_formats[$num_format])) {

                // FORMAT has already been used

                $this->_formats[$i]->_num_format = $hash_num_formats[$num_format];

            }

            else{

                // Add a new FORMAT

                $hash_num_formats[$num_format]  = $index;

                $this->_formats[$i]->_num_format = $index;

                array_push($num_formats,$num_format);

                $index++;

            }

        }

        // Write the new FORMAT records starting from 0xA4

        $index = 164;

        foreach ($num_formats as $num_format) {

            $this->_storeNumFormat($num_format,$index);

            $index++;

        }

    }

    /**

    * Write all XF records.

    *

    * @access private

    */

    function _storeAllXfs()

    {

        // _tmp_format is added by the constructor. We use this to write the default XF's

        // The default font index is 0

        //

        $format = $this->_tmp_format;

        for ($i=0; $i <= 14; $i++) {

            $xf = $format->getXf('style'); // Style XF

            $this->_append($xf);

        }

        $xf = $format->getXf('cell');      // Cell XF

        $this->_append($xf);

        // User defined XFs

        for($i=0; $i < count($this->_formats); $i++) {

            $xf = $this->_formats[$i]->getXf('cell');

            $this->_append($xf);

        }

    }

    /**

    * Write all STYLE records.

    *

    * @access private

    */

    function _storeAllStyles()

    {

        $this->_storeStyle();

    }

    /**

    * Write the EXTERNCOUNT and EXTERNSHEET records. These are used as indexes for

    * the NAME records.

    *

    * @access private

    */

    function _storeExterns()

    {

        // Create EXTERNCOUNT with number of worksheets

        $this->_storeExterncount(count($this->_worksheets));

        // Create EXTERNSHEET for each worksheet

        foreach ($this->_sheetnames as $sheetname) {

            $this->_storeExternsheet($sheetname);

        }

    }

    /**

    * Write the NAME record to define the print area and the repeat rows and cols.

    *

    * @access private

    */

    function _storeNames()

    {

        // Create the print area NAME records

        foreach ($this->_worksheets as $worksheet) {

            // Write a Name record if the print area has been defined

            if (isset($worksheet->print_rowmin))

            {

                $this->_storeNameShort(

                    $worksheet->index,

                    0x06, // NAME type

                    $worksheet->print_rowmin,

                    $worksheet->print_rowmax,

                    $worksheet->print_colmin,

                    $worksheet->print_colmax

                    );

            }

        }

        // Create the print title NAME records

        foreach ($this->_worksheets as $worksheet)

        {

            $rowmin = $worksheet->title_rowmin;

            $rowmax = $worksheet->title_rowmax;

            $colmin = $worksheet->title_colmin;

            $colmax = $worksheet->title_colmax;

            // Determine if row + col, row, col or nothing has been defined

            // and write the appropriate record

            //

            if (isset($rowmin) and isset($colmin)) {

                // Row and column titles have been defined.

                // Row title has been defined.

                $this->_storeNameLong(

                    $worksheet->index,

                    0x07, // NAME type

                    $rowmin,

                    $rowmax,

                    $colmin,

                    $colmax

                    );

            }

            elseif (isset($rowmin)) {

                // Row title has been defined.

                $this->_storeNameShort(

                    $worksheet->index,

                    0x07, // NAME type

                    $rowmin,

                    $rowmax,

                    0x00,

                    0xff

                    );

            }

            elseif (isset($colmin)) {

                // Column title has been defined.

                $this->_storeNameShort(

                    $worksheet->index,

                    0x07, // NAME type

                    0x0000,

                    0x3fff,

                    $colmin,

                    $colmax

                    );

            }

            else {

                // Print title hasn't been defined.

            }

        }

    }

    /******************************************************************************

    *

    * BIFF RECORDS

    *

    */

    /**

    * Write Excel BIFF WINDOW1 record.

    *

    * @access private

    */

    function _storeWindow1()

    {

        $record    = 0x003D;                 // Record identifier

        $length    = 0x0012;                 // Number of bytes to follow

        $xWn       = 0x0000;                 // Horizontal position of window

        $yWn       = 0x0000;                 // Vertical position of window

        $dxWn      = 0x25BC;                 // Width of window

        $dyWn      = 0x1572;                 // Height of window

        $grbit     = 0x0038;                 // Option flags

        $ctabsel   = $this->_selected;       // Number of workbook tabs selected

        $wTabRatio = 0x0258;                 // Tab to scrollbar ratio

        $itabFirst = $this->_firstsheet;     // 1st displayed worksheet

        $itabCur   = $this->_activesheet;    // Active worksheet

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

        $data      = pack("vvvvvvvvv", $xWn, $yWn, $dxWn, $dyWn,

                                       $grbit,

                                       $itabCur, $itabFirst,

                                       $ctabsel, $wTabRatio);

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

    }

    /**

    * Writes Excel BIFF BOUNDSHEET record.

    *

    * @param string  $sheetname Worksheet name

    * @param integer $offset    Location of worksheet BOF

    * @access private

    */

    function _storeBoundsheet($sheetname,$offset)

    {

        $record    = 0x0085;                    // Record identifier

        $length    = 0x07 + strlen($sheetname); // Number of bytes to follow

        $grbit     = 0x0000;                    // Sheet identifier

        $cch       = strlen($sheetname);        // Length of sheet name

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

        $data      = pack("VvC", $offset, $grbit, $cch);

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

    }

    /**

    * Write Excel BIFF STYLE records.

    *

    * @access private

    */

    function _storeStyle()

    {

        $record    = 0x0293;   // Record identifier

        $length    = 0x0004;   // Bytes to follow

        $ixfe      = 0x8000;   // Index to style XF

        $BuiltIn   = 0x00;     // Built-in style

        $iLevel    = 0xff;     // Outline style level

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

        $data      = pack("vCC", $ixfe, $BuiltIn, $iLevel);

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

    }

    /**

    * Writes Excel FORMAT record for non "built-in" numerical formats.

    *

    * @param string  $format Custom format string

    * @param integer $ifmt   Format index code

    * @access private

    */

    function _storeNumFormat($format,$ifmt)

    {

        $record    = 0x041E;                      // Record identifier

        $length    = 0x03 + strlen($format);      // Number of bytes to follow

        $cch       = strlen($format);             // Length of format string

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

        $data      = pack("vC", $ifmt, $cch);

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

    }

    /**

    * Write Excel 1904 record to indicate the date system in use.

    *

    * @access private

    */

    function _store1904()

    {

        $record    = 0x0022;         // Record identifier

        $length    = 0x0002;         // Bytes to follow

        $f1904     = $this->_1904;   // Flag for 1904 date system

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

        $data      = pack("v", $f1904);

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

    }

    /**

    * Write BIFF record EXTERNCOUNT to indicate the number of external sheet

    * references in the workbook.

    *

    * Excel only stores references to external sheets that are used in NAME.

    * The workbook NAME record is required to define the print area and the repeat

    * rows and columns.

    *

    * A similar method is used in Worksheet.php for a slightly different purpose.

    *

    * @param integer $cxals Number of external references

    * @access private

    */

    function _storeExterncount($cxals)

    {

        $record   = 0x0016;          // Record identifier

        $length   = 0x0002;          // Number of bytes to follow

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

        $data     = pack("v",  $cxals);

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

    }

    /**

    * Writes the Excel BIFF EXTERNSHEET record. These references are used by

    * formulas. NAME record is required to define the print area and the repeat

    * rows and columns.

    *

    * A similar method is used in Worksheet.php for a slightly different purpose.

    *

    * @param string $sheetname Worksheet name

    * @access private

    */

    function _storeExternsheet($sheetname)

    {

        $record      = 0x0017;                     // Record identifier

        $length      = 0x02 + strlen($sheetname);  // Number of bytes to follow

        $cch         = strlen($sheetname);         // Length of sheet name

        $rgch        = 0x03;                       // Filename encoding

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

        $data        = pack("CC", $cch, $rgch);

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

    }

    /**

    * Store the NAME record in the short format that is used for storing the print

    * area, repeat rows only and repeat columns only.

    *

    * @param integer $index  Sheet index

    * @param integer $type   Built-in name type

    * @param integer $rowmin Start row

    * @param integer $rowmax End row

    * @param integer $colmin Start colum

    * @param integer $colmax End column

    * @access private

    */

    function _storeNameShort($index,$type,$rowmin,$rowmax,$colmin,$colmax)

    {

        $record          = 0x0018;       // Record identifier

        $length          = 0x0024;       // Number of bytes to follow

        $grbit           = 0x0020;       // Option flags

        $chKey           = 0x00;         // Keyboard shortcut

        $cch             = 0x01;         // Length of text name

        $cce             = 0x0015;       // Length of text definition

        $ixals           = $index + 1;   // Sheet index

        $itab            = $ixals;       // Equal to ixals

        $cchCustMenu     = 0x00;         // Length of cust menu text

        $cchDescription  = 0x00;         // Length of description text

        $cchHelptopic    = 0x00;         // Length of help topic text

        $cchStatustext   = 0x00;         // Length of status bar text

        $rgch            = $type;        // Built-in name type

        $unknown03       = 0x3b;

        $unknown04       = 0xffff-$index;

        $unknown05       = 0x0000;

        $unknown06       = 0x0000;

        $unknown07       = 0x1087;

        $unknown08       = 0x8005;

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

        $data               = pack("v", $grbit);

        $data              .= pack("C", $chKey);

        $data              .= pack("C", $cch);

        $data              .= pack("v", $cce);

        $data              .= pack("v", $ixals);

        $data              .= pack("v", $itab);

        $data              .= pack("C", $cchCustMenu);

        $data              .= pack("C", $cchDescription);

        $data              .= pack("C", $cchHelptopic);

        $data              .= pack("C", $cchStatustext);

        $data              .= pack("C", $rgch);

        $data              .= pack("C", $unknown03);

        $data              .= pack("v", $unknown04);

        $data              .= pack("v", $unknown05);

        $data              .= pack("v", $unknown06);

        $data              .= pack("v", $unknown07);

        $data              .= pack("v", $unknown08);

        $data              .= pack("v", $index);

        $data              .= pack("v", $index);

        $data              .= pack("v", $rowmin);

        $data              .= pack("v", $rowmax);

        $data              .= pack("C", $colmin);

        $data              .= pack("C", $colmax);

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

    }

    /**

    * Store the NAME record in the long format that is used for storing the repeat

    * rows and columns when both are specified. This shares a lot of code with

    * _storeNameShort() but we use a separate method to keep the code clean.

    * Code abstraction for reuse can be carried too far, and I should know. ;-)

    *

    * @param integer $index Sheet index

    * @param integer $type  Built-in name type

    * @param integer $rowmin Start row

    * @param integer $rowmax End row

    * @param integer $colmin Start colum

    * @param integer $colmax End column

    * @access private

    */

    function _storeNameLong($index,$type,$rowmin,$rowmax,$colmin,$colmax)

    {

        $record          = 0x0018;       // Record identifier

        $length          = 0x003d;       // Number of bytes to follow

        $grbit           = 0x0020;       // Option flags

        $chKey           = 0x00;         // Keyboard shortcut

        $cch             = 0x01;         // Length of text name

        $cce             = 0x002e;       // Length of text definition

        $ixals           = $index + 1;   // Sheet index

        $itab            = $ixals;       // Equal to ixals

        $cchCustMenu     = 0x00;         // Length of cust menu text

        $cchDescription  = 0x00;         // Length of description text

        $cchHelptopic    = 0x00;         // Length of help topic text

        $cchStatustext   = 0x00;         // Length of status bar text

        $rgch            = $type;        // Built-in name type

        $unknown01       = 0x29;

        $unknown02       = 0x002b;

        $unknown03       = 0x3b;

        $unknown04       = 0xffff-$index;

        $unknown05       = 0x0000;

        $unknown06       = 0x0000;

        $unknown07       = 0x1087;

        $unknown08       = 0x8008;

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

        $data               = pack("v", $grbit);

        $data              .= pack("C", $chKey);

        $data              .= pack("C", $cch);

        $data              .= pack("v", $cce);

        $data              .= pack("v", $ixals);

        $data              .= pack("v", $itab);

        $data              .= pack("C", $cchCustMenu);

        $data              .= pack("C", $cchDescription);

        $data              .= pack("C", $cchHelptopic);

        $data              .= pack("C", $cchStatustext);

        $data              .= pack("C", $rgch);

        $data              .= pack("C", $unknown01);

        $data              .= pack("v", $unknown02);

        // Column definition

        $data              .= pack("C", $unknown03);

        $data              .= pack("v", $unknown04);

        $data              .= pack("v", $unknown05);

        $data              .= pack("v", $unknown06);

        $data              .= pack("v", $unknown07);

        $data              .= pack("v", $unknown08);

        $data              .= pack("v", $index);

        $data              .= pack("v", $index);

        $data              .= pack("v", 0x0000);

        $data              .= pack("v", 0x3fff);

        $data              .= pack("C", $colmin);

        $data              .= pack("C", $colmax);

        // Row definition