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✏️ Editing: File.php

<?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    1.8.0, 2014-03-02
 */

/**
 * 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());
	}

}

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