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diff --git a/admin/survey/excel/PHPExcel/Writer/Excel5/BIFFwriter.php b/admin/survey/excel/PHPExcel/Writer/Excel5/BIFFwriter.php
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--- a/admin/survey/excel/PHPExcel/Writer/Excel5/BIFFwriter.php
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@@ -1,255 +0,0 @@
-<?php

-/**

- * PHPExcel

- *

- * Copyright (c) 2006 - 2012 PHPExcel

- *

- * This library is free software; you can redistribute it and/or

- * modify it under the terms of the GNU Lesser General Public

- * License as published by the Free Software Foundation; either

- * version 2.1 of the License, or (at your option) any later version.

- *

- * This library is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

- * Lesser General Public License for more details.

- *

- * You should have received a copy of the GNU Lesser General Public

- * License along with this library; if not, write to the Free Software

- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

- *

- * @category   PHPExcel

- * @package    PHPExcel_Writer_Excel5

- * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)

- * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL

- * @version    1.7.8, 2012-10-12

- */

-

-// Original file header of PEAR::Spreadsheet_Excel_Writer_BIFFwriter (used as the base for this class):

-// -----------------------------------------------------------------------------------------

-// *  Module written/ported by Xavier Noguer <xnoguer@rezebra.com>

-// *

-// *  The majority of this is _NOT_ my code.  I simply ported it from the

-// *  PERL Spreadsheet::WriteExcel module.

-// *

-// *  The author of the Spreadsheet::WriteExcel module is John McNamara

-// *  <jmcnamara@cpan.org>

-// *

-// *  I _DO_ maintain this code, and John McNamara has nothing to do with the

-// *  porting of this code to PHP.  Any questions directly related to this

-// *  class library should be directed to me.

-// *

-// *  License Information:

-// *

-// *    Spreadsheet_Excel_Writer:  A library for generating Excel Spreadsheets

-// *    Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com

-// *

-// *    This library is free software; you can redistribute it and/or

-// *    modify it under the terms of the GNU Lesser General Public

-// *    License as published by the Free Software Foundation; either

-// *    version 2.1 of the License, or (at your option) any later version.

-// *

-// *    This library is distributed in the hope that it will be useful,

-// *    but WITHOUT ANY WARRANTY; without even the implied warranty of

-// *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

-// *    Lesser General Public License for more details.

-// *

-// *    You should have received a copy of the GNU Lesser General Public

-// *    License along with this library; if not, write to the Free Software

-// *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-// */

-

-

-/**

- * PHPExcel_Writer_Excel5_BIFFwriter

- *

- * @category   PHPExcel

- * @package    PHPExcel_Writer_Excel5

- * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)

- */

-class PHPExcel_Writer_Excel5_BIFFwriter

-{

-	/**

-	 * The byte order of this architecture. 0 => little endian, 1 => big endian

-	 * @var integer

-	 */

-	private static $_byte_order;

-

-	/**

-	 * The string containing the data of the BIFF stream

-	 * @var string

-	 */

-	public $_data;

-

-	/**

-	 * The size of the data in bytes. Should be the same as strlen($this->_data)

-	 * @var integer

-	 */

-	public $_datasize;

-

-	/**

-	 * The maximum length for a BIFF record (excluding record header and length field). See _addContinue()

-	 * @var integer

-	 * @see _addContinue()

-	 */

-	public $_limit	= 8224;

-

-	/**

-	 * Constructor

-	 */

-	public function __construct()

-	{

-		$this->_data       = '';

-		$this->_datasize   = 0;

-//		$this->_limit      = 8224;

-	}

-

-	/**

-	 * Determine the byte order and store it as class data to avoid

-	 * recalculating it for each call to new().

-	 *

-	 * @return int

-	 */

-	public static function getByteOrder()

-	{

-		if (!isset(self::$_byte_order)) {

-			// Check if "pack" gives the required IEEE 64bit float

-			$teststr = pack("d", 1.2345);

-			$number  = pack("C8", 0x8D, 0x97, 0x6E, 0x12, 0x83, 0xC0, 0xF3, 0x3F);

-			if ($number == $teststr) {

-				$byte_order = 0;    // Little Endian

-			} elseif ($number == strrev($teststr)){

-				$byte_order = 1;    // Big Endian

-			} else {

-				// Give up. I'll fix this in a later version.

-				throw new Exception("Required floating point format not supported on this platform.");

-			}

-			self::$_byte_order = $byte_order;

-		}

-

-		return self::$_byte_order;

-	}

-

-	/**

-	 * General storage function

-	 *

-	 * @param string $data binary data to append

-	 * @access private

-	 */

-	function _append($data)

-	{

-		if (strlen($data) - 4 > $this->_limit) {

-			$data = $this->_addContinue($data);

-		}

-		$this->_data		.= $data;

-		$this->_datasize	+= strlen($data);

-	}

-

-	/**

-	 * General storage function like _append, but returns string instead of modifying $this->_data

-	 *

-	 * @param string $data binary data to write

-	 * @return string

-	 */

-	public function writeData($data)

-	{

-		if (strlen($data) - 4 > $this->_limit) {

-			$data = $this->_addContinue($data);

-		}

-		$this->_datasize += strlen($data);

-

-		return $data;

-	}

-

-	/**

-	 * Writes Excel BOF record to indicate the beginning of a stream or

-	 * sub-stream in the BIFF file.

-	 *

-	 * @param  integer $type Type of BIFF file to write: 0x0005 Workbook,

-	 *                       0x0010 Worksheet.

-	 * @access private

-	 */

-	function _storeBof($type)

-	{

-		$record  = 0x0809;			// Record identifier	(BIFF5-BIFF8)

-		$length  = 0x0010;

-

-		// by inspection of real files, MS Office Excel 2007 writes the following

-		$unknown = pack("VV", 0x000100D1, 0x00000406);

-

-		$build   = 0x0DBB;			//	Excel 97

-		$year    = 0x07CC;			//	Excel 97

-

-		$version = 0x0600;			//	BIFF8

-

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

-		$data    = pack("vvvv", $version, $type, $build, $year);

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

-	}

-

-	/**

-	 * Writes Excel EOF record to indicate the end of a BIFF stream.

-	 *

-	 * @access private

-	 */

-	function _storeEof()

-	{

-		$record    = 0x000A;   // Record identifier

-		$length    = 0x0000;   // Number of bytes to follow

-

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

-		$this->_append($header);

-	}

-

-	/**

-	 * Writes Excel EOF record to indicate the end of a BIFF stream.

-	 *

-	 * @access private

-	 */

-	public function writeEof()

-	{

-		$record    = 0x000A;   // Record identifier

-		$length    = 0x0000;   // Number of bytes to follow

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

-		return $this->writeData($header);

-	}

-

-	/**

-	 * Excel limits the size of BIFF records. In Excel 5 the limit is 2084 bytes. In

-	 * Excel 97 the limit is 8228 bytes. Records that are longer than these limits

-	 * must be split up into CONTINUE blocks.

-	 *

-	 * This function takes a long BIFF record and inserts CONTINUE records as

-	 * necessary.

-	 *

-	 * @param  string  $data The original binary data to be written

-	 * @return string        A very convenient string of continue blocks

-	 * @access private

-	 */

-	function _addContinue($data)

-	{

-		$limit  = $this->_limit;

-		$record = 0x003C;         // Record identifier

-

-		// The first 2080/8224 bytes remain intact. However, we have to change

-		// the length field of the record.

-		$tmp = substr($data, 0, 2) . pack("v", $limit) . substr($data, 4, $limit);

-

-		$header = pack("vv", $record, $limit);  // Headers for continue records

-

-		// Retrieve chunks of 2080/8224 bytes +4 for the header.

-		$data_length = strlen($data);

-		for ($i = $limit + 4; $i < ($data_length - $limit); $i += $limit) {

-			$tmp .= $header;

-			$tmp .= substr($data, $i, $limit);

-		}

-

-		// Retrieve the last chunk of data

-		$header  = pack("vv", $record, strlen($data) - $i);

-		$tmp    .= $header;

-		$tmp    .= substr($data, $i, strlen($data) - $i);

-

-		return $tmp;

-	}

-

-}