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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('PEAR.php');

/**

* Class for creating OLE streams for Excel Spreadsheets

*

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

* @category FileFormats

* @package  Spreadsheet_Excel_Writer

*/

class Spreadsheet_Excel_Writer_OLEwriter extends PEAR

{

    /**

    * Filename for the OLE stream

    * @var string

    * @see _initialize()

    */

    var $_OLEfilename;

    /**

    * Filehandle for the OLE stream

    * @var resource

    */

    var $_filehandle;

    /**

    * Name of the temporal file in case OLE stream goes to stdout

    * @var string

    */

    var $_tmp_filename;

    /**

    * Variable for preventing closing two times

    * @var integer

    */

    var $_fileclosed;

    /**

    * Size of the data to be written to the OLE stream

    * @var integer

    */

    var $_biffsize;

    /**

    * Real data size to be written to the OLE stream

    * @var integer

    */

    var $_booksize;

    /**

    * Number of big blocks in the OLE stream

    * @var integer

    */

    var $_big_blocks;

    /**

    * Number of list blocks in the OLE stream

    * @var integer

    */

    var $_list_blocks;

    /**

    * Number of big blocks in the OLE stream

    * @var integer

    */

    var $_root_start;

    /**

    * Constructor for the OLEwriter class

    *

    * @param string $OLEfilename the name of the file for the OLE stream

    */

    function Spreadsheet_Excel_Writer_OLEwriter($OLEfilename)

    {

        $this->_OLEfilename  = $OLEfilename;

        $this->_filehandle   = "";

        $this->_tmp_filename = "";

        $this->_fileclosed   = 0;

        $this->_biff_only    = 0;

        //$this->_size_allowed = 0;

        $this->_biffsize     = 0;

        $this->_booksize     = 0;

        $this->_big_blocks   = 0;

        $this->_list_blocks  = 0;

        $this->_root_start   = 0;

        //$this->_block_count  = 4;

        $this->_initialize();

    }

    /**

    * Check for a valid filename and store the filehandle.

    * Filehandle "-" writes to STDOUT

    *

    * @access private

    */

    function _initialize()

    {

        $OLEfile = $this->_OLEfilename;

        if(($OLEfile == '-') or ($OLEfile == ''))

        {

            $this->_tmp_filename = tempnam("/tmp", "OLEwriter");

            $fh = fopen($this->_tmp_filename,"wb");

            if ($fh == false) {

                $this->raiseError("Can't create temporary file.");

            }

        }

        else

        {

            // Create a new file, open for writing (in binmode)

            $fh = fopen($OLEfile,"wb");

            if ($fh == false) {

                $this->raiseError("Can't open $OLEfile. It may be in use or protected.");

            }

        }

        // Store filehandle

        $this->_filehandle = $fh;

    }

    /**

    * Set the size of the data to be written to the OLE stream.

    * The maximun size comes from this:

    *   $big_blocks = (109 depot block x (128 -1 marker word)

    *                 - (1 x end words)) = 13842

    *   $maxsize    = $big_blocks * 512 bytes = 7087104

    *

    * @access public

    * @see Spreadsheet_Excel_Writer_Workbook::store_OLE_file()

    * @param integer $biffsize The size of the data to be written to the OLE stream

    * @return integer 1 for success

    */

    function setSize($biffsize)

    {

        $maxsize = 7087104; // TODO: extend max size

        if ($biffsize > $maxsize) {

            $this->raiseError("Maximum file size, $maxsize, exceeded.");

        }

        $this->_biffsize = $biffsize;

        // Set the min file size to 4k to avoid having to use small blocks

        if ($biffsize > 4096) {

            $this->_booksize = $biffsize;

        }

        else {

            $this->_booksize = 4096;

        }

        //$this->_size_allowed = 1;

        return(1);

    }

    /**

    * Calculate various sizes needed for the OLE stream

    *

    * @access private

    */

    function _calculateSizes()

    {

        $datasize = $this->_booksize;

        if ($datasize % 512 == 0) {

            $this->_big_blocks = $datasize/512;

        }

        else {

            $this->_big_blocks = floor($datasize/512) + 1;

        }

        // There are 127 list blocks and 1 marker blocks for each big block

        // depot + 1 end of chain block

        $this->_list_blocks = floor(($this->_big_blocks)/127) + 1;

        $this->_root_start  = $this->_big_blocks;

    }

    /**

    * Write root entry, big block list and close the filehandle.

    * This routine is used to explicitly close the open filehandle without

    * having to wait for DESTROY.

    *

    * @access public

    * @see Spreadsheet_Excel_Writer_Workbook::store_OLE_file()

    */

    function close()

    {

        //return if not $this->{_size_allowed};

        $this->_writePadding();

        $this->_writePropertyStorage();

        $this->_writeBigBlockDepot();

        // Close the filehandle

        fclose($this->_filehandle);

        if(($this->_OLEfilename == '-') or ($this->_OLEfilename == ''))

        {

            $fh = fopen($this->_tmp_filename, "rb");

            if ($fh == false) {

                $this->raiseError("Can't read temporary file.");

            }

            fpassthru($fh);

            @unlink($this->_tmp_filename);

        }

        $this->_fileclosed = 1;

    }

    /**

    * Write BIFF data to OLE file.

    *

    * @param string $data string of bytes to be written

    */

    function write($data)

    {

        fwrite($this->_filehandle,$data,strlen($data));

    }

    /**

    * Write OLE header block.

    */

    function writeHeader()

    {

        $this->_calculateSizes();

        $root_start      = $this->_root_start;

        $num_lists       = $this->_list_blocks;

        $id              = pack("nnnn", 0xD0CF, 0x11E0, 0xA1B1, 0x1AE1);

        $unknown1        = pack("VVVV", 0x00, 0x00, 0x00, 0x00);

        $unknown2        = pack("vv",   0x3E, 0x03);

        $unknown3        = pack("v",    -2);

        $unknown4        = pack("v",    0x09);

        $unknown5        = pack("VVV",  0x06, 0x00, 0x00);

        $num_bbd_blocks  = pack("V",    $num_lists);

        $root_startblock = pack("V",    $root_start);

        $unknown6        = pack("VV",   0x00, 0x1000);

        $sbd_startblock  = pack("V",    -2);

        $unknown7        = pack("VVV",  0x00, -2 ,0x00);

        $unused          = pack("V",    -1);

        fwrite($this->_filehandle,$id);

        fwrite($this->_filehandle,$unknown1);

        fwrite($this->_filehandle,$unknown2);

        fwrite($this->_filehandle,$unknown3);

        fwrite($this->_filehandle,$unknown4);

        fwrite($this->_filehandle,$unknown5);

        fwrite($this->_filehandle,$num_bbd_blocks);

        fwrite($this->_filehandle,$root_startblock);

        fwrite($this->_filehandle,$unknown6);

        fwrite($this->_filehandle,$sbd_startblock);

        fwrite($this->_filehandle,$unknown7);

        for($i=1; $i <= $num_lists; $i++)

        {

            $root_start++;

            fwrite($this->_filehandle,pack("V",$root_start));

        }

        for($i = $num_lists; $i <=108; $i++)

        {

            fwrite($this->_filehandle,$unused);

        }

    }

    /**

    * Write big block depot.

    *

    * @access private

    */

    function _writeBigBlockDepot()

    {

        $num_blocks   = $this->_big_blocks;

        $num_lists    = $this->_list_blocks;

        $total_blocks = $num_lists *128;

        $used_blocks  = $num_blocks + $num_lists +2;

        $marker       = pack("V", -3);

        $end_of_chain = pack("V", -2);

        $unused       = pack("V", -1);

        for($i=1; $i < $num_blocks; $i++)

        {

            fwrite($this->_filehandle,pack("V",$i));

        }

        fwrite($this->_filehandle,$end_of_chain);

        fwrite($this->_filehandle,$end_of_chain);

        for($i=0; $i < $num_lists; $i++)

        {

            fwrite($this->_filehandle,$marker);

        }

        for($i=$used_blocks; $i <= $total_blocks; $i++)

        {

            fwrite($this->_filehandle,$unused);

        }

    }

    /**

    * Write property storage. TODO: add summary sheets

    *

    * @access private

    */

    function _writePropertyStorage()

    {

        //$rootsize = -2;

        /***************  name         type   dir start size */

        $this->_writePps("Root Entry", 0x05,   1,   -2, 0x00);

        $this->_writePps("Book",       0x02,  -1, 0x00, $this->_booksize);

        $this->_writePps('',           0x00,  -1, 0x00, 0x0000);

        $this->_writePps('',           0x00,  -1, 0x00, 0x0000);

    }

/**

* Write property sheet in property storage

*

* @param string  $name  name of the property storage.

* @param integer $type  type of the property storage.

* @param integer $dir   dir of the property storage.

* @param integer $start start of the property storage.

* @param integer $size  size of the property storage.

* @access private

*/

    function _writePps($name,$type,$dir,$start,$size)

    {

        $length  = 0;

        $rawname = '';

        if ($name != '')

        {

            $name = $name . "\0";

            for($i=0;$i<strlen($name);$i++)

            {

                // Simulate a Unicode string

                $rawname .= pack("H*",dechex(ord($name{$i}))).pack("C",0);

            }

            $length = strlen($name) * 2;

        }

        $zero            = pack("C",  0);

        $pps_sizeofname  = pack("v",  $length);    // 0x40

        $pps_type        = pack("v",  $type);      // 0x42

        $pps_prev        = pack("V",  -1);         // 0x44

        $pps_next        = pack("V",  -1);         // 0x48

        $pps_dir         = pack("V",  $dir);       // 0x4c

        $unknown1        = pack("V",  0);

        $pps_ts1s        = pack("V",  0);          // 0x64

        $pps_ts1d        = pack("V",  0);          // 0x68

        $pps_ts2s        = pack("V",  0);          // 0x6c

        $pps_ts2d        = pack("V",  0);          // 0x70

        $pps_sb          = pack("V",  $start);     // 0x74

        $pps_size        = pack("V",  $size);      // 0x78

        fwrite($this->_filehandle,$rawname);

        for($i=0; $i < (64 -$length); $i++) {

            fwrite($this->_filehandle,$zero);

        }

        fwrite($this->_filehandle,$pps_sizeofname);

        fwrite($this->_filehandle,$pps_type);

        fwrite($this->_filehandle,$pps_prev);

        fwrite($this->_filehandle,$pps_next);

        fwrite($this->_filehandle,$pps_dir);

        for($i=0; $i < 5; $i++) {

            fwrite($this->_filehandle,$unknown1);

        }

        fwrite($this->_filehandle,$pps_ts1s);

        fwrite($this->_filehandle,$pps_ts1d);

        fwrite($this->_filehandle,$pps_ts2d);

        fwrite($this->_filehandle,$pps_ts2d);

        fwrite($this->_filehandle,$pps_sb);

        fwrite($this->_filehandle,$pps_size);

        fwrite($this->_filehandle,$unknown1);

    }

    /**

    * Pad the end of the file

    *

    * @access private

    */

    function _writePadding()

    {

        $biffsize = $this->_biffsize;

        if ($biffsize < 4096) {

	    $min_size = 4096;

        }

	else {

            $min_size = 512;

        }

	if ($biffsize % $min_size != 0)

        {

            $padding  = $min_size - ($biffsize % $min_size);

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

                fwrite($this->_filehandle,"\0");

            }

        }

    }

}

?>