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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 1.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * CodeIgniter File Helpers

 *

 * @package		CodeIgniter

 * @subpackage	Helpers

 * @category	Helpers

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/helpers/file_helper.html

 */

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

if ( ! function_exists('read_file'))

{

	/**

	 * Read File

	 *

	 * Opens the file specified in the path and returns it as a string.

	 *

	 * @todo	Remove in version 3.1+.

	 * @deprecated	3.0.0	It is now just an alias for PHP's native file_get_contents().

	 * @param	string	$file	Path to file

	 * @return	string	File contents

	 */

	function read_file($file)

	{

		return @file_get_contents($file);

	}

}

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

if ( ! function_exists('write_file'))

{

	/**

	 * Write File

	 *

	 * Writes data to the file specified in the path.

	 * Creates a new file if non-existent.

	 *

	 * @param	string	$path	File path

	 * @param	string	$data	Data to write

	 * @param	string	$mode	fopen() mode (default: 'wb')

	 * @return	bool

	 */

	function write_file($path, $data, $mode = 'wb')

	{

		if ( ! $fp = @fopen($path, $mode))

		{

			return FALSE;

		}

		flock($fp, LOCK_EX);

		for ($result = $written = 0, $length = strlen($data); $written < $length; $written += $result)

		{

			if (($result = fwrite($fp, substr($data, $written))) === FALSE)

			{

				break;

			}

		}

		flock($fp, LOCK_UN);

		fclose($fp);

		return is_int($result);

	}

}

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

if ( ! function_exists('delete_files'))

{

	/**

	 * Delete Files

	 *

	 * Deletes all files contained in the supplied directory path.

	 * Files must be writable or owned by the system in order to be deleted.

	 * If the second parameter is set to TRUE, any directories contained

	 * within the supplied base directory will be nuked as well.

	 *

	 * @param	string	$path		File path

	 * @param	bool	$del_dir	Whether to delete any directories found in the path

	 * @param	bool	$htdocs		Whether to skip deleting .htaccess and index page files

	 * @param	int	$_level		Current directory depth level (default: 0; internal use only)

	 * @return	bool

	 */

	function delete_files($path, $del_dir = FALSE, $htdocs = FALSE, $_level = 0)

	{

		// Trim the trailing slash

		$path = rtrim($path, '/\\');

		if ( ! $current_dir = @opendir($path))

		{

			return FALSE;

		}

		while (FALSE !== ($filename = @readdir($current_dir)))

		{

			if ($filename !== '.' && $filename !== '..')

			{

				$filepath = $path.DIRECTORY_SEPARATOR.$filename;

				if (is_dir($filepath) && $filename[0] !== '.' && ! is_link($filepath))

				{

					delete_files($filepath, $del_dir, $htdocs, $_level + 1);

				}

				elseif ($htdocs !== TRUE OR ! preg_match('/^(\.htaccess|index\.(html|htm|php)|web\.config)$/i', $filename))

				{

					@unlink($filepath);

				}

			}

		}

		closedir($current_dir);

		return ($del_dir === TRUE && $_level > 0)

			? @rmdir($path)

			: TRUE;

	}

}

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

if ( ! function_exists('get_filenames'))

{

	/**

	 * Get Filenames

	 *

	 * Reads the specified directory and builds an array containing the filenames.

	 * Any sub-folders contained within the specified path are read as well.

	 *

	 * @param	string	path to source

	 * @param	bool	whether to include the path as part of the filename

	 * @param	bool	internal variable to determine recursion status - do not use in calls

	 * @return	array

	 */

	function get_filenames($source_dir, $include_path = FALSE, $_recursion = FALSE)

	{

		static $_filedata = array();

		if ($fp = @opendir($source_dir))

		{

			// reset the array and make sure $source_dir has a trailing slash on the initial call

			if ($_recursion === FALSE)

			{

				$_filedata = array();

				$source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;

			}

			while (FALSE !== ($file = readdir($fp)))

			{

				if (is_dir($source_dir.$file) && $file[0] !== '.')

				{

					get_filenames($source_dir.$file.DIRECTORY_SEPARATOR, $include_path, TRUE);

				}

				elseif ($file[0] !== '.')

				{

					$_filedata[] = ($include_path === TRUE) ? $source_dir.$file : $file;

				}

			}

			closedir($fp);

			return $_filedata;

		}

		return FALSE;

	}

}

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

if ( ! function_exists('get_dir_file_info'))

{

	/**

	 * Get Directory File Information

	 *

	 * Reads the specified directory and builds an array containing the filenames,

	 * filesize, dates, and permissions

	 *

	 * Any sub-folders contained within the specified path are read as well.

	 *

	 * @param	string	path to source

	 * @param	bool	Look only at the top level directory specified?

	 * @param	bool	internal variable to determine recursion status - do not use in calls

	 * @return	array

	 */

	function get_dir_file_info($source_dir, $top_level_only = TRUE, $_recursion = FALSE)

	{

		static $_filedata = array();

		$relative_path = $source_dir;

		if ($fp = @opendir($source_dir))

		{

			// reset the array and make sure $source_dir has a trailing slash on the initial call

			if ($_recursion === FALSE)

			{

				$_filedata = array();

				$source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;

			}

			// Used to be foreach (scandir($source_dir, 1) as $file), but scandir() is simply not as fast

			while (FALSE !== ($file = readdir($fp)))

			{

				if (is_dir($source_dir.$file) && $file[0] !== '.' && $top_level_only === FALSE)

				{

					get_dir_file_info($source_dir.$file.DIRECTORY_SEPARATOR, $top_level_only, TRUE);

				}

				elseif ($file[0] !== '.')

				{

					$_filedata[$file] = get_file_info($source_dir.$file);

					$_filedata[$file]['relative_path'] = $relative_path;

				}

			}

			closedir($fp);

			return $_filedata;

		}

		return FALSE;

	}

}

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

if ( ! function_exists('get_file_info'))

{

	/**

	 * Get File Info

	 *

	 * Given a file and path, returns the name, path, size, date modified

	 * Second parameter allows you to explicitly declare what information you want returned

	 * Options are: name, server_path, size, date, readable, writable, executable, fileperms

	 * Returns FALSE if the file cannot be found.

	 *

	 * @param	string	path to file

	 * @param	mixed	array or comma separated string of information returned

	 * @return	array

	 */

	function get_file_info($file, $returned_values = array('name', 'server_path', 'size', 'date'))

	{

		if ( ! file_exists($file))

		{

			return FALSE;

		}

		if (is_string($returned_values))

		{

			$returned_values = explode(',', $returned_values);

		}

		foreach ($returned_values as $key)

		{

			switch ($key)

			{

				case 'name':

					$fileinfo['name'] = basename($file);

					break;

				case 'server_path':

					$fileinfo['server_path'] = $file;

					break;

				case 'size':

					$fileinfo['size'] = filesize($file);

					break;

				case 'date':

					$fileinfo['date'] = filemtime($file);

					break;

				case 'readable':

					$fileinfo['readable'] = is_readable($file);

					break;

				case 'writable':

					$fileinfo['writable'] = is_really_writable($file);

					break;

				case 'executable':

					$fileinfo['executable'] = is_executable($file);

					break;

				case 'fileperms':

					$fileinfo['fileperms'] = fileperms($file);

					break;

			}

		}

		return $fileinfo;

	}

}

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

if ( ! function_exists('get_mime_by_extension'))

{

	/**

	 * Get Mime by Extension

	 *

	 * Translates a file extension into a mime type based on config/mimes.php.

	 * Returns FALSE if it can't determine the type, or open the mime config file

	 *

	 * Note: this is NOT an accurate way of determining file mime types, and is here strictly as a convenience

	 * It should NOT be trusted, and should certainly NOT be used for security

	 *

	 * @param	string	$filename	File name

	 * @return	string

	 */

	function get_mime_by_extension($filename)

	{

		static $mimes;

		if ( ! is_array($mimes))

		{

			$mimes = get_mimes();

			if (empty($mimes))

			{

				return FALSE;

			}

		}

		$extension = strtolower(substr(strrchr($filename, '.'), 1));

		if (isset($mimes[$extension]))

		{

			return is_array($mimes[$extension])

				? current($mimes[$extension]) // Multiple mime types, just give the first one

				: $mimes[$extension];

		}

		return FALSE;

	}

}

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

if ( ! function_exists('symbolic_permissions'))

{

	/**

	 * Symbolic Permissions

	 *

	 * Takes a numeric value representing a file's permissions and returns

	 * standard symbolic notation representing that value

	 *

	 * @param	int	$perms	Permissions

	 * @return	string

	 */

	function symbolic_permissions($perms)

	{

		if (($perms & 0xC000) === 0xC000)

		{

			$symbolic = 's'; // Socket

		}

		elseif (($perms & 0xA000) === 0xA000)

		{

			$symbolic = 'l'; // Symbolic Link

		}

		elseif (($perms & 0x8000) === 0x8000)

		{

			$symbolic = '-'; // Regular

		}

		elseif (($perms & 0x6000) === 0x6000)

		{

			$symbolic = 'b'; // Block special

		}

		elseif (($perms & 0x4000) === 0x4000)

		{

			$symbolic = 'd'; // Directory

		}

		elseif (($perms & 0x2000) === 0x2000)

		{

			$symbolic = 'c'; // Character special

		}

		elseif (($perms & 0x1000) === 0x1000)

		{

			$symbolic = 'p'; // FIFO pipe

		}

		else

		{

			$symbolic = 'u'; // Unknown

		}

		// Owner

		$symbolic .= (($perms & 0x0100) ? 'r' : '-')

			.(($perms & 0x0080) ? 'w' : '-')

			.(($perms & 0x0040) ? (($perms & 0x0800) ? 's' : 'x' ) : (($perms & 0x0800) ? 'S' : '-'));

		// Group

		$symbolic .= (($perms & 0x0020) ? 'r' : '-')

			.(($perms & 0x0010) ? 'w' : '-')

			.(($perms & 0x0008) ? (($perms & 0x0400) ? 's' : 'x' ) : (($perms & 0x0400) ? 'S' : '-'));

		// World

		$symbolic .= (($perms & 0x0004) ? 'r' : '-')

			.(($perms & 0x0002) ? 'w' : '-')

			.(($perms & 0x0001) ? (($perms & 0x0200) ? 't' : 'x' ) : (($perms & 0x0200) ? 'T' : '-'));

		return $symbolic;

	}

}

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

if ( ! function_exists('octal_permissions'))

{

	/**

	 * Octal Permissions

	 *

	 * Takes a numeric value representing a file's permissions and returns

	 * a three character string representing the file's octal permissions

	 *

	 * @param	int	$perms	Permissions

	 * @return	string

	 */

	function octal_permissions($perms)

	{

		return substr(sprintf('%o', $perms), -3);

	}

}