359 lines
8.4 KiB
PHP
359 lines
8.4 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 4.3.2 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2010, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Zip Compression Class
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*
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* This class is based on a library I found at Zend:
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* http://www.zend.com/codex.php?id=696&single=1
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*
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* The original library is a little rough around the edges so I
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* refactored it and added several additional methods -- Rick Ellis
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Encryption
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/libraries/zip.html
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*/
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class CI_Zip {
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var $zipdata = '';
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var $directory = '';
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var $entries = 0;
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var $file_num = 0;
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var $offset = 0;
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function CI_Zip()
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{
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log_message('debug', "Zip Compression Class Initialized");
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}
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// --------------------------------------------------------------------
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/**
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* Add Directory
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*
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* Lets you add a virtual directory into which you can place files.
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*
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* @access public
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* @param mixed the directory name. Can be string or array
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* @return void
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*/
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function add_dir($directory)
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{
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foreach ((array)$directory as $dir)
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{
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if ( ! preg_match("|.+/$|", $dir))
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{
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$dir .= '/';
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}
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$this->_add_dir($dir);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Add Directory
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*
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* @access private
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* @param string the directory name
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* @return void
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*/
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function _add_dir($dir)
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{
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$dir = str_replace("\\", "/", $dir);
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$this->zipdata .=
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"\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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.pack('V', 0) // crc32
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.pack('V', 0) // compressed filesize
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.pack('V', 0) // uncompressed filesize
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.pack('v', strlen($dir)) // length of pathname
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.pack('v', 0) // extra field length
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.$dir
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// below is "data descriptor" segment
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.pack('V', 0) // crc32
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.pack('V', 0) // compressed filesize
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.pack('V', 0); // uncompressed filesize
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$this->directory .=
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"\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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.pack('V',0) // crc32
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.pack('V',0) // compressed filesize
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.pack('V',0) // uncompressed filesize
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.pack('v', strlen($dir)) // length of pathname
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.pack('v', 0) // extra field length
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.pack('v', 0) // file comment length
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.pack('v', 0) // disk number start
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.pack('v', 0) // internal file attributes
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.pack('V', 16) // external file attributes - 'directory' bit set
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.pack('V', $this->offset) // relative offset of local header
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.$dir;
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$this->offset = strlen($this->zipdata);
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$this->entries++;
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}
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// --------------------------------------------------------------------
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/**
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* Add Data to Zip
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*
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* Lets you add files to the archive. If the path is included
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* in the filename it will be placed within a directory. Make
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* sure you use add_dir() first to create the folder.
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*
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* @access public
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* @param mixed
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* @param string
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* @return void
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*/
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function add_data($filepath, $data = NULL)
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{
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if (is_array($filepath))
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{
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foreach ($filepath as $path => $data)
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{
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$this->_add_data($path, $data);
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}
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}
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else
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{
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$this->_add_data($filepath, $data);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Add Data to Zip
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*
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* @access private
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* @param string the file name/path
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* @param string the data to be encoded
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* @return void
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*/
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function _add_data($filepath, $data)
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{
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$filepath = str_replace("\\", "/", $filepath);
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$uncompressed_size = strlen($data);
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$crc32 = crc32($data);
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$gzdata = gzcompress($data);
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$gzdata = substr($gzdata, 2, -4);
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$compressed_size = strlen($gzdata);
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$this->zipdata .=
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"\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00"
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.pack('V', $crc32)
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.pack('V', $compressed_size)
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.pack('V', $uncompressed_size)
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.pack('v', strlen($filepath)) // length of filename
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.pack('v', 0) // extra field length
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.$filepath
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.$gzdata; // "file data" segment
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$this->directory .=
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"\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00"
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.pack('V', $crc32)
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.pack('V', $compressed_size)
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.pack('V', $uncompressed_size)
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.pack('v', strlen($filepath)) // length of filename
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.pack('v', 0) // extra field length
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.pack('v', 0) // file comment length
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.pack('v', 0) // disk number start
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.pack('v', 0) // internal file attributes
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.pack('V', 32) // external file attributes - 'archive' bit set
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.pack('V', $this->offset) // relative offset of local header
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.$filepath;
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$this->offset = strlen($this->zipdata);
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$this->entries++;
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$this->file_num++;
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}
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// --------------------------------------------------------------------
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/**
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* Read the contents of a file and add it to the zip
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*
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* @access public
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* @return bool
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*/
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function read_file($path, $preserve_filepath = FALSE)
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{
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if ( ! file_exists($path))
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{
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return FALSE;
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}
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if (FALSE !== ($data = file_get_contents($path)))
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{
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$name = str_replace("\\", "/", $path);
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if ($preserve_filepath === FALSE)
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{
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$name = preg_replace("|.*/(.+)|", "\\1", $name);
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}
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$this->add_data($name, $data);
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return TRUE;
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}
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return FALSE;
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}
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// ------------------------------------------------------------------------
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/**
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* Read a directory and add it to the zip.
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*
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* This function recursively reads a folder and everything it contains (including
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* sub-folders) and creates a zip based on it. Whatever directory structure
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* is in the original file path will be recreated in the zip file.
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*
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* @access public
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* @param string path to source
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* @return bool
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*/
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function read_dir($path)
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{
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if ($fp = @opendir($path))
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{
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while (FALSE !== ($file = readdir($fp)))
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{
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if (@is_dir($path.$file) && substr($file, 0, 1) != '.')
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{
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$this->read_dir($path.$file."/");
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}
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elseif (substr($file, 0, 1) != ".")
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{
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if (FALSE !== ($data = file_get_contents($path.$file)))
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{
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$this->add_data(str_replace("\\", "/", $path).$file, $data);
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}
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}
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}
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return TRUE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Get the Zip file
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*
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* @access public
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* @return binary string
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*/
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function get_zip()
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{
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// Is there any data to return?
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if ($this->entries == 0)
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{
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return FALSE;
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}
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$zip_data = $this->zipdata;
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$zip_data .= $this->directory."\x50\x4b\x05\x06\x00\x00\x00\x00";
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$zip_data .= pack('v', $this->entries); // total # of entries "on this disk"
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$zip_data .= pack('v', $this->entries); // total # of entries overall
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$zip_data .= pack('V', strlen($this->directory)); // size of central dir
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$zip_data .= pack('V', strlen($this->zipdata)); // offset to start of central dir
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$zip_data .= "\x00\x00"; // .zip file comment length
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return $zip_data;
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}
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// --------------------------------------------------------------------
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/**
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* Write File to the specified directory
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*
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* Lets you write a file
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*
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* @access public
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* @param string the file name
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* @return bool
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*/
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function archive($filepath)
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{
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if ( ! ($fp = @fopen($filepath, FOPEN_WRITE_CREATE_DESTRUCTIVE)))
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{
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return FALSE;
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}
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flock($fp, LOCK_EX);
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fwrite($fp, $this->get_zip());
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flock($fp, LOCK_UN);
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fclose($fp);
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Download
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*
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* @access public
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* @param string the file name
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* @param string the data to be encoded
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* @return bool
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*/
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function download($filename = 'backup.zip')
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{
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if ( ! preg_match("|.+?\.zip$|", $filename))
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{
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$filename .= '.zip';
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}
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$zip_content =& $this->get_zip();
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$CI =& get_instance();
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$CI->load->helper('download');
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force_download($filename, $zip_content);
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}
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// --------------------------------------------------------------------
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/**
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* Initialize Data
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*
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* Lets you clear current zip data. Useful if you need to create
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* multiple zips with different data.
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*
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* @access public
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* @return void
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*/
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function clear_data()
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{
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$this->zipdata = '';
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$this->directory = '';
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$this->entries = 0;
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$this->file_num = 0;
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$this->offset = 0;
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}
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}
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/* End of file Zip.php */
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/* Location: ./system/libraries/Zip.php */ |