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-rw-r--r--system/libraries/Zip.php359
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diff --git a/system/libraries/Zip.php b/system/libraries/Zip.php
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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 - 2009, 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 */ \ No newline at end of file
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