text: <?php
  /**
   * PHPExcel
   *
   * Copyright (c) 2006 - 2014 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_Shared
   * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
   * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
   * @version    ##VERSION##, ##DATE##
   */
  
  
  /**
   * PHPExcel_Shared_File
   *
   * @category   PHPExcel
   * @package    PHPExcel_Shared
   * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
   */
  class PHPExcel_Shared_File
  {
  	/*
  	 * Use Temp or File Upload Temp for temporary files
  	 *
  	 * @protected
  	 * @var	boolean
  	 */
  	protected static $_useUploadTempDirectory	= FALSE;
  
  
  	/**
  	 * Set the flag indicating whether the File Upload Temp directory should be used for temporary files
  	 *
  	 * @param	 boolean	$useUploadTempDir		Use File Upload Temporary directory (true or false)
  	 */
  	public static function setUseUploadTempDirectory($useUploadTempDir = FALSE) {
  		self::$_useUploadTempDirectory = (boolean) $useUploadTempDir;
  	}	//	function setUseUploadTempDirectory()
  
  
  	/**
  	 * Get the flag indicating whether the File Upload Temp directory should be used for temporary files
  	 *
  	 * @return	 boolean	Use File Upload Temporary directory (true or false)
  	 */
  	public static function getUseUploadTempDirectory() {
  		return self::$_useUploadTempDirectory;
  	}	//	function getUseUploadTempDirectory()
  
  
  	/**
  	  * Verify if a file exists
  	  *
  	  * @param 	string	$pFilename	Filename
  	  * @return bool
  	  */
  	public static function file_exists($pFilename) {
  		// Sick construction, but it seems that
  		// file_exists returns strange values when
  		// doing the original file_exists on ZIP archives...
  		if ( strtolower(substr($pFilename, 0, 3)) == 'zip' ) {
  			// Open ZIP file and verify if the file exists
  			$zipFile 		= substr($pFilename, 6, strpos($pFilename, '#') - 6);
  			$archiveFile 	= substr($pFilename, strpos($pFilename, '#') + 1);
  
  			$zip = new ZipArchive();
  			if ($zip->open($zipFile) === true) {
  				$returnValue = ($zip->getFromName($archiveFile) !== false);
  				$zip->close();
  				return $returnValue;
  			} else {
  				return false;
  			}
  		} else {
  			// Regular file_exists
  			return file_exists($pFilename);
  		}
  	}
  
  	/**
  	 * Returns canonicalized absolute pathname, also for ZIP archives
  	 *
  	 * @param string $pFilename
  	 * @return string
  	 */
  	public static function realpath($pFilename) {
  		// Returnvalue
  		$returnValue = '';
  
  		// Try using realpath()
  		if (file_exists($pFilename)) {
  			$returnValue = realpath($pFilename);
  		}
  
  		// Found something?
  		if ($returnValue == '' || ($returnValue === NULL)) {
  			$pathArray = explode('/' , $pFilename);
  			while(in_array('..', $pathArray) && $pathArray[0] != '..') {
  				for ($i = 0; $i < count($pathArray); ++$i) {
  					if ($pathArray[$i] == '..' && $i > 0) {
  						unset($pathArray[$i]);
  						unset($pathArray[$i - 1]);
  						break;
  					}
  				}
  			}
  			$returnValue = implode('/', $pathArray);
  		}
  
  		// Return
  		return $returnValue;
  	}
  
  	/**
  	 * Get the systems temporary directory.
  	 *
  	 * @return string
  	 */
  	public static function sys_get_temp_dir()
  	{
  		if (self::$_useUploadTempDirectory) {
  			//  use upload-directory when defined to allow running on environments having very restricted
  			//      open_basedir configs
  			if (ini_get('upload_tmp_dir') !== FALSE) {
  				if ($temp = ini_get('upload_tmp_dir')) {
  					if (file_exists($temp))
  						return realpath($temp);
  				}
  			}
  		}
  
  		// sys_get_temp_dir is only available since PHP 5.2.1
  		// http://php.net/manual/en/function.sys-get-temp-dir.php#94119
  		if ( !function_exists('sys_get_temp_dir')) {
  			if ($temp = getenv('TMP') ) {
  				if ((!empty($temp)) && (file_exists($temp))) { return realpath($temp); }
  			}
  			if ($temp = getenv('TEMP') ) {
  				if ((!empty($temp)) && (file_exists($temp))) { return realpath($temp); }
  			}
  			if ($temp = getenv('TMPDIR') ) {
  				if ((!empty($temp)) && (file_exists($temp))) { return realpath($temp); }
  			}
  
  			// trick for creating a file in system's temporary dir
  			// without knowing the path of the system's temporary dir
  			$temp = tempnam(__FILE__, '');
  			if (file_exists($temp)) {
  				unlink($temp);
  				return realpath(dirname($temp));
  			}
  
  			return null;
  		}
  
  		// use ordinary built-in PHP function
  		//	There should be no problem with the 5.2.4 Suhosin realpath() bug, because this line should only
  		//		be called if we're running 5.2.1 or earlier
  		return realpath(sys_get_temp_dir());
  	}
  
  }
  