641 行
无行尾
20 KiB
PHP
641 行
无行尾
20 KiB
PHP
<?php defined('BASEPATH') or exit('No direct script access allowed');
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/**
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* UnZip Class
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*
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* This class is based on a library I found at PHPClasses:
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* http://phpclasses.org/package/2495-PHP-Pack-and-unpack-files-packed-in-ZIP-archives.html
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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 -- Phil Sturgeon
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*
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* This class requires extension ZLib Enabled.
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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 Alexandre Tedeschi
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* @author Phil Sturgeon
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* @author Don Myers
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* @link http://bitbucket.org/philsturgeon/codeigniter-unzip
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* @license
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* @version 1.0.0
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*/
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class Unzip {
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private $compressed_list = array();
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// List of files in the ZIP
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private $central_dir_list = array();
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// Central dir list... It's a kind of 'extra attributes' for a set of files
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private $end_of_central = array();
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// End of central dir, contains ZIP Comments
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private $info = array();
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private $error = array();
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private $_zip_file = '';
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private $_target_dir = FALSE;
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private $apply_chmod = 0777;
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private $fh;
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private $zip_signature = "\x50\x4b\x03\x04";
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// local file header signature
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private $dir_signature = "\x50\x4b\x01\x02";
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// central dir header signature
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private $central_signature_end = "\x50\x4b\x05\x06";
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// ignore these directories (useless meta data)
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private $_skip_dirs = array('__MACOSX');
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private $_allow_extensions = NULL; // What is allowed out of the zip
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// --------------------------------------------------------------------
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/**
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* Constructor
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*
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* @access Public
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* @param string
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* @return none
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*/
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function __construct()
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{
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log_message('debug', 'Unzip Class Initialized');
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}
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// --------------------------------------------------------------------
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/**
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* re inizilize all variables
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* @access Private
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* @param none
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* @return none
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*/
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private function _reinit()
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{
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$this->compressed_list = array();
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$this->central_dir_list = array();
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$this->end_of_central = array();
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$this->info = array();
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$this->error = array();
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}
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/**
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* Unzip all files in archive.
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*
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* @access Public
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* @param none
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* @return none
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*/
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public function extract($zip_file, $target_dir = NULL, $preserve_filepath = TRUE)
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{
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$this->_reinit();
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$this->_zip_file = $zip_file;
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$this->_target_dir = $target_dir ? $target_dir : dirname($this->_zip_file);
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if ( ! $files = $this->_list_files())
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{
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$this->set_error('ZIP folder was empty.');
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return FALSE;
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}
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$file_locations = array();
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foreach ($files as $file => $trash)
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{
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$dirname = pathinfo($file, PATHINFO_DIRNAME);
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$extension = pathinfo($file, PATHINFO_EXTENSION);
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$folders = explode('/', $dirname);
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$out_dn = $this->_target_dir . '/' . $dirname;
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// Skip stuff in stupid folders
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if (in_array(current($folders), $this->_skip_dirs))
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{
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continue;
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}
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// Skip any files that are not allowed
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if (is_array($this->_allow_extensions) AND $extension AND ! in_array($extension, $this->_allow_extensions))
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{
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continue;
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}
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if ( ! is_dir($out_dn) AND $preserve_filepath)
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{
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$str = "";
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foreach ($folders as $folder)
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{
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$str = $str ? $str . '/' . $folder : $folder;
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if ( ! is_dir($this->_target_dir . '/' . $str))
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{
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$this->set_debug('Creating folder: ' . $this->_target_dir . '/' . $str);
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if ( ! @mkdir($this->_target_dir . '/' . $str))
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{
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$this->set_error('Desitnation path is not writable.');
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return FALSE;
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}
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// Apply chmod if configured to do so
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$this->apply_chmod AND chmod($this->_target_dir . '/' . $str, $this->apply_chmod);
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}
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}
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}
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if (substr($file, -1, 1) == '/') continue;
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$file_locations[] = $file_location = $this->_target_dir . '/' . ($preserve_filepath ? $file : basename($file));
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$this->_extract_file($file, $file_location);
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}
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$this->compressed_list = array();
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return $file_locations;
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}
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// --------------------------------------------------------------------
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/**
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* What extensions do we want out of this ZIP
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*
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* @access Public
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* @param none
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* @return none
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*/
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public function allow($ext = NULL)
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{
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$this->_allow_extensions = $ext;
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}
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// --------------------------------------------------------------------
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/**
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* Show error messages
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*
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* @access public
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* @param string
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* @return string
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*/
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public function error_string($open = '<p>', $close = '</p>')
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{
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return $open . implode($close . $open, $this->error) . $close;
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}
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// --------------------------------------------------------------------
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/**
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* Show debug messages
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*
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* @access public
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* @param string
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* @return string
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*/
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public function debug_string($open = '<p>', $close = '</p>')
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{
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return $open . implode($close . $open, $this->info) . $close;
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}
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// --------------------------------------------------------------------
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/**
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* Save errors
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*
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* @access Private
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* @param string
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* @return none
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*/
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function set_error($string)
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{
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$this->error[] = $string;
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}
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// --------------------------------------------------------------------
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/**
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* Save debug data
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*
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* @access Private
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* @param string
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* @return none
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*/
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function set_debug($string)
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{
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$this->info[] = $string;
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}
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// --------------------------------------------------------------------
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/**
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* List all files in archive.
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*
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* @access Public
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* @param boolean
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* @return mixed
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*/
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private function _list_files($stop_on_file = FALSE)
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{
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if (sizeof($this->compressed_list))
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{
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$this->set_debug('Returning already loaded file list.');
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return $this->compressed_list;
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}
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// Open file, and set file handler
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$fh = fopen($this->_zip_file, 'r');
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$this->fh = &$fh;
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if ( ! $fh)
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{
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$this->set_error('Failed to load file: ' . $this->_zip_file);
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return FALSE;
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}
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$this->set_debug('Loading list from "End of Central Dir" index list...');
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if ( ! $this->_load_file_list_by_eof($fh, $stop_on_file))
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{
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$this->set_debug('Failed! Trying to load list looking for signatures...');
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if ( ! $this->_load_files_by_signatures($fh, $stop_on_file))
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{
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$this->set_debug('Failed! Could not find any valid header.');
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$this->set_error('ZIP File is corrupted or empty');
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return FALSE;
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}
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}
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return $this->compressed_list;
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}
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// --------------------------------------------------------------------
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/**
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* Unzip file in archive.
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*
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* @access Public
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* @param string, boolean
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* @return Unziped file.
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*/
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private function _extract_file($compressed_file_name, $target_file_name = FALSE)
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{
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if ( ! sizeof($this->compressed_list))
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{
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$this->set_debug('Trying to unzip before loading file list... Loading it!');
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$this->_list_files(FALSE, $compressed_file_name);
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}
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$fdetails = &$this->compressed_list[$compressed_file_name];
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if ( ! isset($this->compressed_list[$compressed_file_name]))
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{
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$this->set_error('File "<strong>$compressed_file_name</strong>" is not compressed in the zip.');
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return FALSE;
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}
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if (substr($compressed_file_name, -1) == '/')
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{
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$this->set_error('Trying to unzip a folder name "<strong>$compressed_file_name</strong>".');
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return FALSE;
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}
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if ( ! $fdetails['uncompressed_size'])
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{
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$this->set_debug('File "<strong>$compressed_file_name</strong>" is empty.');
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return $target_file_name ? file_put_contents($target_file_name, '') : '';
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}
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fseek($this->fh, $fdetails['contents_start_offset']);
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$ret = $this->_uncompress(
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fread($this->fh, $fdetails['compressed_size']),
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$fdetails['compression_method'],
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$fdetails['uncompressed_size'],
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$target_file_name
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);
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if ($this->apply_chmod AND $target_file_name)
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{
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chmod($target_file_name, FILE_READ_MODE);
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}
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return $ret;
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}
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// --------------------------------------------------------------------
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/**
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* Free the file resource.
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*
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* @access Public
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* @param none
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* @return none
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*/
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public function close()
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{
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// Free the file resource
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if ($this->fh)
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{
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fclose($this->fh);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Free the file resource Automatic destroy.
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*
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* @access Public
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* @param none
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* @return none
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*/
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public function __destroy()
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{
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$this->close();
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}
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// --------------------------------------------------------------------
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/**
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* Uncompress file. And save it to the targetFile.
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*
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* @access Private
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* @param Filecontent, int, int, boolean
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* @return none
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*/
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private function _uncompress($content, $mode, $uncompressed_size, $target_file_name = FALSE)
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{
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switch ($mode)
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{
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case 0:
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return $target_file_name ? file_put_contents($target_file_name, $content) : $content;
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case 1:
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$this->set_error('Shrunk mode is not supported... yet?');
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return FALSE;
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case 2:
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case 3:
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case 4:
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case 5:
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$this->set_error('Compression factor ' . ($mode - 1) . ' is not supported... yet?');
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return FALSE;
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case 6:
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$this->set_error('Implode is not supported... yet?');
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return FALSE;
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case 7:
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$this->set_error('Tokenizing compression algorithm is not supported... yet?');
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return FALSE;
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case 8:
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// Deflate
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return $target_file_name ?
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file_put_contents($target_file_name, gzinflate($content, $uncompressed_size)) :
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gzinflate($content, $uncompressed_size);
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case 9:
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$this->set_error('Enhanced Deflating is not supported... yet?');
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return FALSE;
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case 10:
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$this->set_error('PKWARE Date Compression Library Impoloding is not supported... yet?');
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return FALSE;
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case 12:
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// Bzip2
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return $target_file_name ?
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file_put_contents($target_file_name, bzdecompress($content)) :
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bzdecompress($content);
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case 18:
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$this->set_error('IBM TERSE is not supported... yet?');
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return FALSE;
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default:
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$this->set_error('Unknown uncompress method: $mode');
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return FALSE;
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}
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}
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private function _load_file_list_by_eof(&$fh, $stop_on_file = FALSE)
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{
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// Check if there's a valid Central Dir signature.
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// Let's consider a file comment smaller than 1024 characters...
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// Actually, it length can be 65536.. But we're not going to support it.
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for ($x = 0; $x < 1024; $x++)
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{
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fseek($fh, -22 - $x, SEEK_END);
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$signature = fread($fh, 4);
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if ($signature == $this->central_signature_end)
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{
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// If found EOF Central Dir
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$eodir['disk_number_this'] = unpack("v", fread($fh, 2)); // number of this disk
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$eodir['disk_number'] = unpack("v", fread($fh, 2)); // number of the disk with the start of the central directory
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$eodir['total_entries_this'] = unpack("v", fread($fh, 2)); // total number of entries in the central dir on this disk
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$eodir['total_entries'] = unpack("v", fread($fh, 2)); // total number of entries in
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$eodir['size_of_cd'] = unpack("V", fread($fh, 4)); // size of the central directory
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$eodir['offset_start_cd'] = unpack("V", fread($fh, 4)); // offset of start of central directory with respect to the starting disk number
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$zip_comment_lenght = unpack("v", fread($fh, 2)); // zipfile comment length
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$eodir['zipfile_comment'] = $zip_comment_lenght[1] ? fread($fh, $zip_comment_lenght[1]) : ''; // zipfile comment
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$this->end_of_central = array(
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'disk_number_this' => $eodir['disk_number_this'][1],
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'disk_number' => $eodir['disk_number'][1],
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'total_entries_this' => $eodir['total_entries_this'][1],
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'total_entries' => $eodir['total_entries'][1],
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'size_of_cd' => $eodir['size_of_cd'][1],
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'offset_start_cd' => $eodir['offset_start_cd'][1],
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'zipfile_comment' => $eodir['zipfile_comment'],
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);
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// Then, load file list
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fseek($fh, $this->end_of_central['offset_start_cd']);
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$signature = fread($fh, 4);
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while ($signature == $this->dir_signature)
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{
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$dir['version_madeby'] = unpack("v", fread($fh, 2)); // version made by
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$dir['version_needed'] = unpack("v", fread($fh, 2)); // version needed to extract
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$dir['general_bit_flag'] = unpack("v", fread($fh, 2)); // general purpose bit flag
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$dir['compression_method'] = unpack("v", fread($fh, 2)); // compression method
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$dir['lastmod_time'] = unpack("v", fread($fh, 2)); // last mod file time
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$dir['lastmod_date'] = unpack("v", fread($fh, 2)); // last mod file date
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$dir['crc-32'] = fread($fh, 4); // crc-32
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$dir['compressed_size'] = unpack("V", fread($fh, 4)); // compressed size
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$dir['uncompressed_size'] = unpack("V", fread($fh, 4)); // uncompressed size
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$zip_file_length = unpack("v", fread($fh, 2)); // filename length
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$extra_field_length = unpack("v", fread($fh, 2)); // extra field length
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$fileCommentLength = unpack("v", fread($fh, 2)); // file comment length
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$dir['disk_number_start'] = unpack("v", fread($fh, 2)); // disk number start
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$dir['internal_attributes'] = unpack("v", fread($fh, 2)); // internal file attributes-byte1
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$dir['external_attributes1'] = unpack("v", fread($fh, 2)); // external file attributes-byte2
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$dir['external_attributes2'] = unpack("v", fread($fh, 2)); // external file attributes
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$dir['relative_offset'] = unpack("V", fread($fh, 4)); // relative offset of local header
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$dir['file_name'] = fread($fh, $zip_file_length[1]); // filename
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$dir['extra_field'] = $extra_field_length[1] ? fread($fh, $extra_field_length[1]) : ''; // extra field
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$dir['file_comment'] = $fileCommentLength[1] ? fread($fh, $fileCommentLength[1]) : ''; // file comment
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// Convert the date and time, from MS-DOS format to UNIX Timestamp
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$binary_mod_date = str_pad(decbin($dir['lastmod_date'][1]), 16, '0', STR_PAD_LEFT);
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$binary_mod_time = str_pad(decbin($dir['lastmod_time'][1]), 16, '0', STR_PAD_LEFT);
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$last_mod_year = bindec(substr($binary_mod_date, 0, 7)) + 1980;
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$last_mod_month = bindec(substr($binary_mod_date, 7, 4));
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$last_mod_day = bindec(substr($binary_mod_date, 11, 5));
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$last_mod_hour = bindec(substr($binary_mod_time, 0, 5));
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$last_mod_minute = bindec(substr($binary_mod_time, 5, 6));
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$last_mod_second = bindec(substr($binary_mod_time, 11, 5));
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$this->central_dir_list[$dir['file_name']] = array(
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'version_madeby' => $dir['version_madeby'][1],
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'version_needed' => $dir['version_needed'][1],
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'general_bit_flag' => str_pad(decbin($dir['general_bit_flag'][1]), 8, '0', STR_PAD_LEFT),
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'compression_method' => $dir['compression_method'][1],
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'lastmod_datetime' => mktime($last_mod_hour, $last_mod_minute, $last_mod_second, $last_mod_month, $last_mod_day, $last_mod_year),
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'crc-32' => str_pad(dechex(ord($dir['crc-32'][3])), 2, '0', STR_PAD_LEFT) .
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str_pad(dechex(ord($dir['crc-32'][2])), 2, '0', STR_PAD_LEFT) .
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str_pad(dechex(ord($dir['crc-32'][1])), 2, '0', STR_PAD_LEFT) .
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str_pad(dechex(ord($dir['crc-32'][0])), 2, '0', STR_PAD_LEFT),
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'compressed_size' => $dir['compressed_size'][1],
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'uncompressed_size' => $dir['uncompressed_size'][1],
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'disk_number_start' => $dir['disk_number_start'][1],
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'internal_attributes' => $dir['internal_attributes'][1],
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'external_attributes1' => $dir['external_attributes1'][1],
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'external_attributes2' => $dir['external_attributes2'][1],
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'relative_offset' => $dir['relative_offset'][1],
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'file_name' => $dir['file_name'],
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'extra_field' => $dir['extra_field'],
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'file_comment' => $dir['file_comment'],
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|
);
|
|
|
|
$signature = fread($fh, 4);
|
|
}
|
|
|
|
// If loaded centralDirs, then try to identify the offsetPosition of the compressed data.
|
|
if ($this->central_dir_list)
|
|
{
|
|
foreach ($this->central_dir_list as $filename => $details)
|
|
{
|
|
$i = $this->_get_file_header($fh, $details['relative_offset']);
|
|
|
|
$this->compressed_list[$filename]['file_name'] = $filename;
|
|
$this->compressed_list[$filename]['compression_method'] = $details['compression_method'];
|
|
$this->compressed_list[$filename]['version_needed'] = $details['version_needed'];
|
|
$this->compressed_list[$filename]['lastmod_datetime'] = $details['lastmod_datetime'];
|
|
$this->compressed_list[$filename]['crc-32'] = $details['crc-32'];
|
|
$this->compressed_list[$filename]['compressed_size'] = $details['compressed_size'];
|
|
$this->compressed_list[$filename]['uncompressed_size'] = $details['uncompressed_size'];
|
|
$this->compressed_list[$filename]['lastmod_datetime'] = $details['lastmod_datetime'];
|
|
$this->compressed_list[$filename]['extra_field'] = $i['extra_field'];
|
|
$this->compressed_list[$filename]['contents_start_offset'] = $i['contents_start_offset'];
|
|
|
|
if (strtolower($stop_on_file) == strtolower($filename))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
private function _load_files_by_signatures(&$fh, $stop_on_file = FALSE)
|
|
{
|
|
fseek($fh, 0);
|
|
|
|
$return = FALSE;
|
|
for (;;)
|
|
{
|
|
$details = $this->_get_file_header($fh);
|
|
|
|
if ( ! $details)
|
|
{
|
|
$this->set_debug('Invalid signature. Trying to verify if is old style Data Descriptor...');
|
|
fseek($fh, 12 - 4, SEEK_CUR); // 12: Data descriptor - 4: Signature (that will be read again)
|
|
$details = $this->_get_file_header($fh);
|
|
}
|
|
|
|
if ( ! $details)
|
|
{
|
|
$this->set_debug('Still invalid signature. Probably reached the end of the file.');
|
|
break;
|
|
}
|
|
|
|
$filename = $details['file_name'];
|
|
$this->compressed_list[$filename] = $details;
|
|
$return = true;
|
|
|
|
if (strtolower($stop_on_file) == strtolower($filename))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $return;
|
|
}
|
|
|
|
private function _get_file_header(&$fh, $start_offset = FALSE)
|
|
{
|
|
if ($start_offset !== FALSE)
|
|
{
|
|
fseek($fh, $start_offset);
|
|
}
|
|
|
|
$signature = fread($fh, 4);
|
|
|
|
if ($signature == $this->zip_signature)
|
|
{
|
|
// Get information about the zipped file
|
|
$file['version_needed'] = unpack("v", fread($fh, 2)); // version needed to extract
|
|
$file['general_bit_flag'] = unpack("v", fread($fh, 2)); // general purpose bit flag
|
|
$file['compression_method'] = unpack("v", fread($fh, 2)); // compression method
|
|
$file['lastmod_time'] = unpack("v", fread($fh, 2)); // last mod file time
|
|
$file['lastmod_date'] = unpack("v", fread($fh, 2)); // last mod file date
|
|
$file['crc-32'] = fread($fh, 4); // crc-32
|
|
$file['compressed_size'] = unpack("V", fread($fh, 4)); // compressed size
|
|
$file['uncompressed_size'] = unpack("V", fread($fh, 4)); // uncompressed size
|
|
$zip_file_length = unpack("v", fread($fh, 2)); // filename length
|
|
$extra_field_length = unpack("v", fread($fh, 2)); // extra field length
|
|
$file['file_name'] = fread($fh, $zip_file_length[1]); // filename
|
|
$file['extra_field'] = $extra_field_length[1] ? fread($fh, $extra_field_length[1]) : ''; // extra field
|
|
$file['contents_start_offset'] = ftell($fh);
|
|
|
|
// Bypass the whole compressed contents, and look for the next file
|
|
fseek($fh, $file['compressed_size'][1], SEEK_CUR);
|
|
|
|
// Convert the date and time, from MS-DOS format to UNIX Timestamp
|
|
$binary_mod_date = str_pad(decbin($file['lastmod_date'][1]), 16, '0', STR_PAD_LEFT);
|
|
$binary_mod_time = str_pad(decbin($file['lastmod_time'][1]), 16, '0', STR_PAD_LEFT);
|
|
|
|
$last_mod_year = bindec(substr($binary_mod_date, 0, 7)) + 1980;
|
|
$last_mod_month = bindec(substr($binary_mod_date, 7, 4));
|
|
$last_mod_day = bindec(substr($binary_mod_date, 11, 5));
|
|
$last_mod_hour = bindec(substr($binary_mod_time, 0, 5));
|
|
$last_mod_minute = bindec(substr($binary_mod_time, 5, 6));
|
|
$last_mod_second = bindec(substr($binary_mod_time, 11, 5));
|
|
|
|
// Mount file table
|
|
$i = array(
|
|
'file_name' => $file['file_name'],
|
|
'compression_method' => $file['compression_method'][1],
|
|
'version_needed' => $file['version_needed'][1],
|
|
'lastmod_datetime' => mktime($last_mod_hour, $last_mod_minute, $last_mod_second, $last_mod_month, $last_mod_day, $last_mod_year),
|
|
'crc-32' => str_pad(dechex(ord($file['crc-32'][3])), 2, '0', STR_PAD_LEFT) .
|
|
str_pad(dechex(ord($file['crc-32'][2])), 2, '0', STR_PAD_LEFT) .
|
|
str_pad(dechex(ord($file['crc-32'][1])), 2, '0', STR_PAD_LEFT) .
|
|
str_pad(dechex(ord($file['crc-32'][0])), 2, '0', STR_PAD_LEFT),
|
|
'compressed_size' => $file['compressed_size'][1],
|
|
'uncompressed_size' => $file['uncompressed_size'][1],
|
|
'extra_field' => $file['extra_field'],
|
|
'general_bit_flag' => str_pad(decbin($file['general_bit_flag'][1]), 8, '0', STR_PAD_LEFT),
|
|
'contents_start_offset' => $file['contents_start_offset']
|
|
);
|
|
|
|
return $i;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* End of file Unzip.php */
|
|
/* Location: ./system/libraries/Unzip.php */ |