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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');/*** CodeIgniter** An open source application development framework for PHP 4.3.2 or newer** @package CodeIgniter* @author ExpressionEngine Dev Team* @copyright Copyright (c) 2008, EllisLab, Inc.* @license http://codeigniter.com/user_guide/license.html* @link http://codeigniter.com* @since Version 1.0* @filesource*/// ------------------------------------------------------------------------/*** Zip Compression Class** This class is based on a library I found at Zend:* http://www.zend.com/codex.php?id=696&single=1** The original library is a little rough around the edges so I* refactored it and added several additional methods -- Rick Ellis** @package CodeIgniter* @subpackage Libraries* @category Encryption* @author ExpressionEngine Dev Team* @link http://codeigniter.com/user_guide/libraries/zip.html*/class CI_Zip {var $zipdata = '';var $directory = '';var $entries = 0;var $file_num = 0;var $offset = 0;function CI_Zip(){log_message('debug', "Zip Compression Class Initialized");}// --------------------------------------------------------------------/*** Add Directory** Lets you add a virtual directory into which you can place files.** @access public* @param mixed the directory name. Can be string or array* @return void*/function add_dir($directory){foreach ((array)$directory as $dir){if ( ! preg_match("|.+/$|", $dir)){$dir .= '/';}$this->_add_dir($dir);}}// --------------------------------------------------------------------/*** Add Directory** @access private* @param string the directory name* @return void*/function _add_dir($dir){$dir = str_replace("\\", "/", $dir);$this->zipdata .="\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00".pack('V', 0) // crc32.pack('V', 0) // compressed filesize.pack('V', 0) // uncompressed filesize.pack('v', strlen($dir)) // length of pathname.pack('v', 0) // extra field length.$dir// below is "data descriptor" segment.pack('V', 0) // crc32.pack('V', 0) // compressed filesize.pack('V', 0); // uncompressed filesize$this->directory .="\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00".pack('V',0) // crc32.pack('V',0) // compressed filesize.pack('V',0) // uncompressed filesize.pack('v', strlen($dir)) // length of pathname.pack('v', 0) // extra field length.pack('v', 0) // file comment length.pack('v', 0) // disk number start.pack('v', 0) // internal file attributes.pack('V', 16) // external file attributes - 'directory' bit set.pack('V', $this->offset) // relative offset of local header.$dir;$this->offset = strlen($this->zipdata);$this->entries++;}// --------------------------------------------------------------------/*** Add Data to Zip** Lets you add files to the archive. If the path is included* in the filename it will be placed within a directory. Make* sure you use add_dir() first to create the folder.** @access public* @param mixed* @param string* @return void*/function add_data($filepath, $data = NULL){if (is_array($filepath)){foreach ($filepath as $path => $data){$this->_add_data($path, $data);}}else{$this->_add_data($filepath, $data);}}// --------------------------------------------------------------------/*** Add Data to Zip** @access private* @param string the file name/path* @param string the data to be encoded* @return void*/function _add_data($filepath, $data){$filepath = str_replace("\\", "/", $filepath);$uncompressed_size = strlen($data);$crc32 = crc32($data);$gzdata = gzcompress($data);$gzdata = substr($gzdata, 2, -4);$compressed_size = strlen($gzdata);$this->zipdata .="\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00".pack('V', $crc32).pack('V', $compressed_size).pack('V', $uncompressed_size).pack('v', strlen($filepath)) // length of filename.pack('v', 0) // extra field length.$filepath.$gzdata; // "file data" segment$this->directory .="\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00".pack('V', $crc32).pack('V', $compressed_size).pack('V', $uncompressed_size).pack('v', strlen($filepath)) // length of filename.pack('v', 0) // extra field length.pack('v', 0) // file comment length.pack('v', 0) // disk number start.pack('v', 0) // internal file attributes.pack('V', 32) // external file attributes - 'archive' bit set.pack('V', $this->offset) // relative offset of local header.$filepath;$this->offset = strlen($this->zipdata);$this->entries++;$this->file_num++;}// --------------------------------------------------------------------/*** Read the contents of a file and add it to the zip** @access public* @return bool*/function read_file($path, $preserve_filepath = FALSE){if ( ! file_exists($path)){return FALSE;}if (FALSE !== ($data = file_get_contents($path))){$name = str_replace("\\", "/", $path);if ($preserve_filepath === FALSE){$name = preg_replace("|.*/(.+)|", "\\1", $name);}$this->add_data($name, $data);return TRUE;}return FALSE;}// ------------------------------------------------------------------------/*** Read a directory and add it to the zip.** This function recursively reads a folder and everything it contains (including* sub-folders) and creates a zip based on it. Whatever directory structure* is in the original file path will be recreated in the zip file.** @access public* @param string path to source* @return bool*/function read_dir($path){if ($fp = @opendir($path)){while (FALSE !== ($file = readdir($fp))){if (@is_dir($path.$file) && substr($file, 0, 1) != '.'){$this->read_dir($path.$file."/");}elseif (substr($file, 0, 1) != "."){if (FALSE !== ($data = file_get_contents($path.$file))){$this->add_data(str_replace("\\", "/", $path).$file, $data);}}}return TRUE;}}// --------------------------------------------------------------------/*** Get the Zip file** @access public* @return binary string*/function get_zip(){// Is there any data to return?if ($this->entries == 0){return FALSE;}$zip_data = $this->zipdata;$zip_data .= $this->directory."\x50\x4b\x05\x06\x00\x00\x00\x00";$zip_data .= pack('v', $this->entries); // total # of entries "on this disk"$zip_data .= pack('v', $this->entries); // total # of entries overall$zip_data .= pack('V', strlen($this->directory)); // size of central dir$zip_data .= pack('V', strlen($this->zipdata)); // offset to start of central dir$zip_data .= "\x00\x00"; // .zip file comment lengthreturn $zip_data;}// --------------------------------------------------------------------/*** Write File to the specified directory** Lets you write a file** @access public* @param string the file name* @return bool*/function archive($filepath){if ( ! ($fp = @fopen($filepath, FOPEN_WRITE_CREATE_DESTRUCTIVE))){return FALSE;}flock($fp, LOCK_EX);fwrite($fp, $this->get_zip());flock($fp, LOCK_UN);fclose($fp);return TRUE;}// --------------------------------------------------------------------/*** Download** @access public* @param string the file name* @param string the data to be encoded* @return bool*/function download($filename = 'backup.zip'){if ( ! preg_match("|.+?\.zip$|", $filename)){$filename .= '.zip';}$zip_content =& $this->get_zip();$CI =& get_instance();$CI->load->helper('download');force_download($filename, $zip_content);}// --------------------------------------------------------------------/*** Initialize Data** Lets you clear current zip data. Useful if you need to create* multiple zips with different data.** @access public* @return void*/function clear_data(){$this->zipdata = '';$this->directory = '';$this->entries = 0;$this->file_num = 0;$this->offset = 0;}}/* End of file Zip.php *//* Location: ./system/libraries/Zip.php */