source: sourcecode/system/helpers/file_helper.php @ 1

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 1.0
 * @filesource
 */

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

/**
 * CodeIgniter File Helpers
 *
 * @package             CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author              ExpressionEngine Dev Team
 * @link                http://codeigniter.com/user_guide/helpers/file_helpers.html
 */

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

/**
 * Read File
 *
 * Opens the file specfied in the path and returns it as a string.
 *
 * @access      public
 * @param       string  path to file
 * @return      string
 */
if ( ! function_exists('read_file'))
{
        function read_file($file)
        {
                if ( ! file_exists($file))
                {
                        return FALSE;
                }

                if (function_exists('file_get_contents'))
                {
                        return file_get_contents($file);
                }

                if ( ! $fp = @fopen($file, FOPEN_READ))
                {
                        return FALSE;
                }

                flock($fp, LOCK_SH);

                $data = '';
                if (filesize($file) > 0)
                {
                        $data =& fread($fp, filesize($file));
                }

                flock($fp, LOCK_UN);
                fclose($fp);

                return $data;
        }
}

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

/**
 * Write File
 *
 * Writes data to the file specified in the path.
 * Creates a new file if non-existent.
 *
 * @access      public
 * @param       string  path to file
 * @param       string  file data
 * @return      bool
 */
if ( ! function_exists('write_file'))
{
        function write_file($path, $data, $mode = FOPEN_WRITE_CREATE_DESTRUCTIVE)
        {
                if ( ! $fp = @fopen($path, $mode))
                {
                        return FALSE;
                }

                flock($fp, LOCK_EX);
                fwrite($fp, $data);
                flock($fp, LOCK_UN);
                fclose($fp);

                return TRUE;
        }
}

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

/**
 * 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.
 *
 * @access      public
 * @param       string  path to file
 * @param       bool    whether to delete any directories found in the path
 * @return      bool
 */
if ( ! function_exists('delete_files'))
{
        function delete_files($path, $del_dir = FALSE, $level = 0)
        {
                // Trim the trailing slash
                $path = rtrim($path, DIRECTORY_SEPARATOR);

                if ( ! $current_dir = @opendir($path))
                {
                        return FALSE;
                }

                while (FALSE !== ($filename = @readdir($current_dir)))
                {
                        if ($filename != "." and $filename != "..")
                        {
                                if (is_dir($path.DIRECTORY_SEPARATOR.$filename))
                                {
                                        // Ignore empty folders
                                        if (substr($filename, 0, 1) != '.')
                                        {
                                                delete_files($path.DIRECTORY_SEPARATOR.$filename, $del_dir, $level + 1);
                                        }
                                }
                                else
                                {
                                        unlink($path.DIRECTORY_SEPARATOR.$filename);
                                }
                        }
                }
                @closedir($current_dir);

                if ($del_dir == TRUE AND $level > 0)
                {
                        return @rmdir($path);
                }

                return TRUE;
        }
}

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

/**
 * 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.
 *
 * @access      public
 * @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
 */
if ( ! function_exists('get_filenames'))
{
        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) && strncmp($file, '.', 1) !== 0)
                                {
                                        get_filenames($source_dir.$file.DIRECTORY_SEPARATOR, $include_path, TRUE);
                                }
                                elseif (strncmp($file, '.', 1) !== 0)
                                {
                                        $_filedata[] = ($include_path == TRUE) ? $source_dir.$file : $file;
                                }
                        }
                        return $_filedata;
                }
                else
                {
                        return FALSE;
                }
        }
}

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

/**
 * 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.
 *
 * @access      public
 * @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
 */
if ( ! function_exists('get_dir_file_info'))
{
        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;
                        }

                        // foreach (scandir($source_dir, 1) as $file) // In addition to being PHP5+, scandir() is simply not as fast
                        while (FALSE !== ($file = readdir($fp)))
                        {
                                if (@is_dir($source_dir.$file) AND strncmp($file, '.', 1) !== 0 AND $top_level_only === FALSE)
                                {
                                        get_dir_file_info($source_dir.$file.DIRECTORY_SEPARATOR, $top_level_only, TRUE);
                                }
                                elseif (strncmp($file, '.', 1) !== 0)
                                {
                                        $_filedata[$file] = get_file_info($source_dir.$file);
                                        $_filedata[$file]['relative_path'] = $relative_path;
                                }
                        }

                        return $_filedata;
                }
                else
                {
                        return FALSE;
                }
        }
}

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

/**
* 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.
*
* @access       public
* @param        string  path to file
* @param        mixed   array or comma separated string of information returned
* @return       array
*/
if ( ! function_exists('get_file_info'))
{
        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':
                                        $fileinfo['name'] = substr(strrchr($file, DIRECTORY_SEPARATOR), 1);
                                        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':
                                        // There are known problems using is_weritable on IIS.  It may not be reliable - consider fileperms()
                                        $fileinfo['writable'] = is_writable($file);
                                        break;
                                case 'executable':
                                        $fileinfo['executable'] = is_executable($file);
                                        break;
                                case 'fileperms':
                                        $fileinfo['fileperms'] = fileperms($file);
                                        break;
                        }
                }

                return $fileinfo;
        }
}

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

/**
 * 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
 *
 * @access      public
 * @param       string  path to file
 * @return      mixed
 */
if ( ! function_exists('get_mime_by_extension'))
{
        function get_mime_by_extension($file)
        {
                $extension = strtolower(substr(strrchr($file, '.'), 1));

                global $mimes;

                if ( ! is_array($mimes))
                {
                        if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
                        {
                                include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
                        }
                        elseif (is_file(APPPATH.'config/mimes.php'))
                        {
                                include(APPPATH.'config/mimes.php');
                        }

                        if ( ! is_array($mimes))
                        {
                                return FALSE;
                        }
                }

                if (array_key_exists($extension, $mimes))
                {
                        if (is_array($mimes[$extension]))
                        {
                                // Multiple mime types, just give the first one
                                return current($mimes[$extension]);
                        }
                        else
                        {
                                return $mimes[$extension];
                        }
                }
                else
                {
                        return FALSE;
                }
        }
}

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

/**
 * Symbolic Permissions
 *
 * Takes a numeric value representing a file's permissions and returns
 * standard symbolic notation representing that value
 *
 * @access      public
 * @param       int
 * @return      string
 */
if ( ! function_exists('symbolic_permissions'))
{
        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' : '-');
                $symbolic .= (($perms & 0x0080) ? 'w' : '-');
                $symbolic .= (($perms & 0x0040) ? (($perms & 0x0800) ? 's' : 'x' ) : (($perms & 0x0800) ? 'S' : '-'));

                // Group
                $symbolic .= (($perms & 0x0020) ? 'r' : '-');
                $symbolic .= (($perms & 0x0010) ? 'w' : '-');
                $symbolic .= (($perms & 0x0008) ? (($perms & 0x0400) ? 's' : 'x' ) : (($perms & 0x0400) ? 'S' : '-'));

                // World
                $symbolic .= (($perms & 0x0004) ? 'r' : '-');
                $symbolic .= (($perms & 0x0002) ? 'w' : '-');
                $symbolic .= (($perms & 0x0001) ? (($perms & 0x0200) ? 't' : 'x' ) : (($perms & 0x0200) ? 'T' : '-'));

                return $symbolic;
        }
}

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

/**
 * Octal Permissions
 *
 * Takes a numeric value representing a file's permissions and returns
 * a three character string representing the file's octal permissions
 *
 * @access      public
 * @param       int
 * @return      string
 */
if ( ! function_exists('octal_permissions'))
{
        function octal_permissions($perms)
        {
                return substr(sprintf('%o', $perms), -3);
        }
}


/* End of file file_helper.php */
/* Location: ./system/helpers/file_helper.php */