<?php

/**
 * PHPExcel_Shared_File
 *
 * Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
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;
    }


    /**
     * 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;
    }


    /**
      * 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()
    {
        return null;
    }
}
