<?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 length return $zip_data; } // -------------------------------------------------------------------- /** * Write File to the specified directory * * Lets you write a file * * @access public * @param string the file name * @return bool */ function archive($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 */