Viewing file:  Zip.php (8.4 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
<?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 - 2010, 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 */
|