<?php
/**
 * PhpWord
 *
 * Copyright (c) 2014 PhpWord
 *
 * 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   PhpWord
 * @package    PhpWord
 * @copyright  Copyright (c) 2014 PhpWord
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    0.8.0
 */

namespace PhpOffice\PhpWord\Shared;

class File
{
    /**
     * Verify if a file exists
     *
     * @param    string $pFilename Filename
     * @return bool
     */
    public static function file_exists($pFilename)
    {
        // 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()
        $returnValue = realpath($pFilename);

        // Found something?
        if ($returnValue == '' || is_null($returnValue)) {
            $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;
    }
}