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<?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
*/

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

/**
* 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;
var $now;

/**
* Constructor
*/
public function __construct()
{
log_message('debug', "Zip Compression Class Initialized");

$this->now = time();
}

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

/**
* 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 .= '/';
}

$dir_time = $this->_get_mod_time($dir);

$this->_add_dir($dir, $dir_time['file_mtime'], $dir_time['file_mdate']);
}
}

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

/**
* Get file/directory modification time
*
* If this is a newly created file/dir, we will set the time to 'now'
*
* @param string path to file
* @return array filemtime/filemdate
*/
function _get_mod_time($dir)
{
// filemtime() will return false, but it does raise an error.
$date = (@filemtime($dir)) ? filemtime($dir) : getdate($this->now);

$time['file_mtime'] = ($date['hours'] << 11) + ($date['minutes'] << 5) + $date['seconds'] / 2;
$time['file_mdate'] = (($date['year'] - 1980) << 9) + ($date['mon'] << 5) + $date['mday'];

return $time;
}

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

/**
* Add Directory
*
* @access private
* @param string the directory name
* @return void
*/
function _add_dir($dir, $file_mtime, $file_mdate)
{
$dir = str_replace("\\", "/", $dir);

$this->zipdata .=
"\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V', 0) // crc32
.pack('V', 0) // compressed filesize
.pack('V', 0) // uncompressed filesize
.pack('v', strlen($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"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V',0) // crc32
.pack('V',0) // compressed filesize
.pack('V',0) // uncompressed filesize
.pack('v', strlen($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)
{
$file_data = $this->_get_mod_time($path);

$this->_add_data($path, $data, $file_data['file_mtime'], $file_data['file_mdate']);
}
}
else
{
$file_data = $this->_get_mod_time($filepath);

$this->_add_data($filepath, $data, $file_data['file_mtime'], $file_data['file_mdate']);
}
}

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

/**
* 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, $file_mtime, $file_mdate)
{
$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"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.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"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.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, $preserve_filepath = TRUE, $root_path = NULL)
{
if ( ! $fp = @opendir($path))
{
return FALSE;
}

// Set the original directory root for child dir's to use as relative
if ($root_path === NULL)
{
$root_path = dirname($path).'/';
}

while (FALSE !== ($file = readdir($fp)))
{
if (substr($file, 0, 1) == '.')
{
continue;
}

if (@is_dir($path.$file))
{
$this->read_dir($path.$file."/", $preserve_filepath, $root_path);
}
else
{
if (FALSE !== ($data = file_get_contents($path.$file)))
{
$name = str_replace("\\", "/", $path);

if ($preserve_filepath === FALSE)
{
$name = str_replace($root_path, '', $name);
}

$this->add_data($name.$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';
}

$CI =& get_instance();
$CI->load->helper('download');

$get_zip = $this->get_zip();

$zip_content =& $get_zip;

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 */
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