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869 lines
28 KiB
869 lines
28 KiB
2 years ago
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Implementation of zip file archive.
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*
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* @package core_files
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once("$CFG->libdir/filestorage/file_archive.php");
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/**
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* Zip file archive class.
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*
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* @package core_files
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* @category files
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class zip_archive extends file_archive {
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/** @var string Pathname of archive */
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protected $archivepathname = null;
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/** @var int archive open mode */
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protected $mode = null;
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/** @var int Used memory tracking */
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protected $usedmem = 0;
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/** @var int Iteration position */
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protected $pos = 0;
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/** @var ZipArchive instance */
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protected $za;
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/** @var bool was this archive modified? */
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protected $modified = false;
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/** @var array unicode decoding array, created by decoding zip file */
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protected $namelookup = null;
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/** @var string base64 encoded contents of empty zip file */
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protected static $emptyzipcontent = 'UEsFBgAAAAAAAAAAAAAAAAAAAAAAAA==';
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/** @var bool ugly hack for broken empty zip handling in < PHP 5.3.10 */
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protected $emptyziphack = false;
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/**
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* Create new zip_archive instance.
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*/
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public function __construct() {
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$this->encoding = null; // Autodetects encoding by default.
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}
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/**
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* Open or create archive (depending on $mode).
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*
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* @todo MDL-31048 return error message
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* @param string $archivepathname
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* @param int $mode OPEN, CREATE or OVERWRITE constant
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* @param string $encoding archive local paths encoding, empty means autodetect
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* @return bool success
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*/
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public function open($archivepathname, $mode=file_archive::CREATE, $encoding=null) {
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$this->close();
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$this->usedmem = 0;
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$this->pos = 0;
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$this->encoding = $encoding;
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$this->mode = $mode;
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$this->za = new ZipArchive();
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switch($mode) {
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case file_archive::OPEN: $flags = 0; break;
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case file_archive::OVERWRITE: $flags = ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE; break; //changed in PHP 5.2.8
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case file_archive::CREATE:
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default : $flags = ZIPARCHIVE::CREATE; break;
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}
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$result = $this->za->open($archivepathname, $flags);
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if ($flags == 0 and $result === ZIPARCHIVE::ER_NOZIP and filesize($archivepathname) === 22) {
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// Legacy PHP versions < 5.3.10 can not deal with empty zip archives.
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if (file_get_contents($archivepathname) === base64_decode(self::$emptyzipcontent)) {
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if ($temp = make_temp_directory('zip')) {
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$this->emptyziphack = tempnam($temp, 'zip');
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$this->za = new ZipArchive();
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$result = $this->za->open($this->emptyziphack, ZIPARCHIVE::CREATE);
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}
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}
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}
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if ($result === true) {
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if (file_exists($archivepathname)) {
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$this->archivepathname = realpath($archivepathname);
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} else {
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$this->archivepathname = $archivepathname;
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}
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return true;
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} else {
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$message = 'Unknown error.';
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switch ($result) {
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case ZIPARCHIVE::ER_EXISTS: $message = 'File already exists.'; break;
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case ZIPARCHIVE::ER_INCONS: $message = 'Zip archive inconsistent.'; break;
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case ZIPARCHIVE::ER_INVAL: $message = 'Invalid argument.'; break;
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case ZIPARCHIVE::ER_MEMORY: $message = 'Malloc failure.'; break;
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case ZIPARCHIVE::ER_NOENT: $message = 'No such file.'; break;
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case ZIPARCHIVE::ER_NOZIP: $message = 'Not a zip archive.'; break;
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case ZIPARCHIVE::ER_OPEN: $message = 'Can\'t open file.'; break;
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case ZIPARCHIVE::ER_READ: $message = 'Read error.'; break;
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case ZIPARCHIVE::ER_SEEK: $message = 'Seek error.'; break;
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}
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debugging($message.': '.$archivepathname, DEBUG_DEVELOPER);
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$this->za = null;
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$this->archivepathname = null;
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return false;
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}
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}
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/**
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* Normalize $localname, always keep in utf-8 encoding.
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*
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* @param string $localname name of file in utf-8 encoding
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* @return string normalised compressed file or directory name
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*/
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protected function mangle_pathname($localname) {
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$result = str_replace('\\', '/', $localname); // no MS \ separators
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$result = preg_replace('/\.\.+/', '', $result); // prevent /.../
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$result = ltrim($result, '/'); // no leading slash
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if ($result === '.') {
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$result = '';
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}
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return $result;
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}
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/**
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* Tries to convert $localname into utf-8
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* please note that it may fail really badly.
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* The resulting file name is cleaned.
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*
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* @param string $localname name (encoding is read from zip file or guessed)
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* @return string in utf-8
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*/
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protected function unmangle_pathname($localname) {
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$this->init_namelookup();
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if (!isset($this->namelookup[$localname])) {
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$name = $localname;
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// This should not happen.
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if (!empty($this->encoding) and $this->encoding !== 'utf-8') {
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$name = @core_text::convert($name, $this->encoding, 'utf-8');
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}
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$name = str_replace('\\', '/', $name); // no MS \ separators
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$name = clean_param($name, PARAM_PATH); // only safe chars
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return ltrim($name, '/'); // no leading slash
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}
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return $this->namelookup[$localname];
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}
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/**
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* Close archive, write changes to disk.
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*
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* @return bool success
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*/
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public function close() {
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if (!isset($this->za)) {
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return false;
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}
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if ($this->emptyziphack) {
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@$this->za->close();
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$this->za = null;
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$this->mode = null;
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$this->namelookup = null;
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$this->modified = false;
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@unlink($this->emptyziphack);
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$this->emptyziphack = false;
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return true;
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} else if ($this->za->numFiles == 0) {
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// PHP can not create empty archives, so let's fake it.
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@$this->za->close();
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$this->za = null;
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$this->mode = null;
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$this->namelookup = null;
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$this->modified = false;
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// If the existing archive is already empty, we didn't change it. Don't bother completing a save.
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// This is important when we are inspecting archives that we might not have write permission to.
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if (@filesize($this->archivepathname) == 22 &&
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@file_get_contents($this->archivepathname) === base64_decode(self::$emptyzipcontent)) {
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return true;
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}
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@unlink($this->archivepathname);
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$data = base64_decode(self::$emptyzipcontent);
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if (!file_put_contents($this->archivepathname, $data)) {
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return false;
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}
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return true;
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}
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$res = $this->za->close();
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$this->za = null;
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$this->mode = null;
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$this->namelookup = null;
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if ($this->modified) {
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$this->fix_utf8_flags();
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$this->modified = false;
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}
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return $res;
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}
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/**
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* Returns file stream for reading of content.
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*
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* @param int $index index of file
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* @return resource|bool file handle or false if error
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*/
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public function get_stream($index) {
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if (!isset($this->za)) {
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return false;
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}
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$name = $this->za->getNameIndex($index);
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if ($name === false) {
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return false;
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}
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return $this->za->getStream($name);
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}
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/**
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* Returns file information.
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*
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* @param int $index index of file
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* @return stdClass|bool info object or false if error
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*/
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public function get_info($index) {
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if (!isset($this->za)) {
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return false;
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}
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// Need to use the ZipArchive's numfiles, as $this->count() relies on this function to count actual files (skipping OSX junk).
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if ($index < 0 or $index >=$this->za->numFiles) {
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return false;
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}
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// PHP 5.6 introduced encoding guessing logic, we need to fall back
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// to raw ZIP_FL_ENC_RAW (== 64) to get consistent results as in PHP 5.5.
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$result = $this->za->statIndex($index, 64);
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if ($result === false) {
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return false;
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}
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$info = new stdClass();
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$info->index = $index;
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$info->original_pathname = $result['name'];
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$info->pathname = $this->unmangle_pathname($result['name']);
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$info->mtime = (int)$result['mtime'];
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if ($info->pathname[strlen($info->pathname)-1] === '/') {
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$info->is_directory = true;
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$info->size = 0;
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} else {
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$info->is_directory = false;
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$info->size = (int)$result['size'];
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}
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if ($this->is_system_file($info)) {
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// Don't return system files.
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return false;
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}
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return $info;
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}
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/**
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* Returns array of info about all files in archive.
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*
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* @return array of file infos
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*/
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public function list_files() {
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if (!isset($this->za)) {
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return false;
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}
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$infos = array();
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foreach ($this as $info) {
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// Simply iterating over $this will give us info only for files we're interested in.
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array_push($infos, $info);
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}
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return $infos;
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}
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public function is_system_file($fileinfo) {
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if (substr($fileinfo->pathname, 0, 8) === '__MACOSX' or substr($fileinfo->pathname, -9) === '.DS_Store') {
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// Mac OSX system files.
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return true;
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}
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if (substr($fileinfo->pathname, -9) === 'Thumbs.db') {
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$stream = $this->za->getStream($fileinfo->pathname);
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$info = base64_encode(fread($stream, 8));
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fclose($stream);
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if ($info === '0M8R4KGxGuE=') {
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// It's an OLE Compound File - so it's almost certainly a Windows thumbnail cache.
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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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return false;
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||
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}
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||
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|
||
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/**
|
||
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* Returns number of files in archive.
|
||
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*
|
||
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* @return int number of files
|
||
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*/
|
||
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public function count() {
|
||
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if (!isset($this->za)) {
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return false;
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||
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}
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||
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return count($this->list_files());
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||
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}
|
||
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|
||
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|
/**
|
||
|
|
* Returns approximate number of files in archive. This may be a slight
|
||
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* overestimate.
|
||
|
|
*
|
||
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* @return int|bool Estimated number of files, or false if not opened
|
||
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|
*/
|
||
|
|
public function estimated_count() {
|
||
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if (!isset($this->za)) {
|
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return false;
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||
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}
|
||
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||
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return $this->za->numFiles;
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||
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}
|
||
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|
||
|
|
/**
|
||
|
|
* Add file into archive.
|
||
|
|
*
|
||
|
|
* @param string $localname name of file in archive
|
||
|
|
* @param string $pathname location of file
|
||
|
|
* @return bool success
|
||
|
|
*/
|
||
|
|
public function add_file_from_pathname($localname, $pathname) {
|
||
|
|
if ($this->emptyziphack) {
|
||
|
|
$this->close();
|
||
|
|
$this->open($this->archivepathname, file_archive::OVERWRITE, $this->encoding);
|
||
|
|
}
|
||
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|
||
|
|
if (!isset($this->za)) {
|
||
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return false;
|
||
|
|
}
|
||
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|
||
|
|
if ($this->archivepathname === realpath($pathname)) {
|
||
|
|
// Do not add self into archive.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!is_readable($pathname) or is_dir($pathname)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (is_null($localname)) {
|
||
|
|
$localname = clean_param($pathname, PARAM_PATH);
|
||
|
|
}
|
||
|
|
$localname = trim($localname, '/'); // No leading slashes in archives!
|
||
|
|
$localname = $this->mangle_pathname($localname);
|
||
|
|
|
||
|
|
if ($localname === '') {
|
||
|
|
// Sorry - conversion failed badly.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!$this->za->addFile($pathname, $localname)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$this->modified = true;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add content of string into archive.
|
||
|
|
*
|
||
|
|
* @param string $localname name of file in archive
|
||
|
|
* @param string $contents contents
|
||
|
|
* @return bool success
|
||
|
|
*/
|
||
|
|
public function add_file_from_string($localname, $contents) {
|
||
|
|
if ($this->emptyziphack) {
|
||
|
|
$this->close();
|
||
|
|
$this->open($this->archivepathname, file_archive::OVERWRITE, $this->encoding);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!isset($this->za)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$localname = trim($localname, '/'); // No leading slashes in archives!
|
||
|
|
$localname = $this->mangle_pathname($localname);
|
||
|
|
|
||
|
|
if ($localname === '') {
|
||
|
|
// Sorry - conversion failed badly.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->usedmem > 2097151) {
|
||
|
|
// This prevents running out of memory when adding many large files using strings.
|
||
|
|
$this->close();
|
||
|
|
$res = $this->open($this->archivepathname, file_archive::OPEN, $this->encoding);
|
||
|
|
if ($res !== true) {
|
||
|
|
print_error('cannotopenzip');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$this->usedmem += strlen($contents);
|
||
|
|
|
||
|
|
if (!$this->za->addFromString($localname, $contents)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$this->modified = true;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add empty directory into archive.
|
||
|
|
*
|
||
|
|
* @param string $localname name of file in archive
|
||
|
|
* @return bool success
|
||
|
|
*/
|
||
|
|
public function add_directory($localname) {
|
||
|
|
if ($this->emptyziphack) {
|
||
|
|
$this->close();
|
||
|
|
$this->open($this->archivepathname, file_archive::OVERWRITE, $this->encoding);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!isset($this->za)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$localname = trim($localname, '/'). '/';
|
||
|
|
$localname = $this->mangle_pathname($localname);
|
||
|
|
|
||
|
|
if ($localname === '/') {
|
||
|
|
// Sorry - conversion failed badly.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($localname !== '') {
|
||
|
|
if (!$this->za->addEmptyDir($localname)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$this->modified = true;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns current file info.
|
||
|
|
*
|
||
|
|
* @return stdClass
|
||
|
|
*/
|
||
|
|
public function current() {
|
||
|
|
if (!isset($this->za)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->get_info($this->pos);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the index of current file.
|
||
|
|
*
|
||
|
|
* @return int current file index
|
||
|
|
*/
|
||
|
|
public function key() {
|
||
|
|
return $this->pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Moves forward to next file.
|
||
|
|
*/
|
||
|
|
public function next() {
|
||
|
|
$this->pos++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Rewinds back to the first file.
|
||
|
|
*/
|
||
|
|
public function rewind() {
|
||
|
|
$this->pos = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Did we reach the end?
|
||
|
|
*
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function valid() {
|
||
|
|
if (!isset($this->za)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Skip over unwanted system files (get_info will return false).
|
||
|
|
while (!$this->get_info($this->pos) && $this->pos < $this->za->numFiles) {
|
||
|
|
$this->next();
|
||
|
|
}
|
||
|
|
|
||
|
|
// No files left - we're at the end.
|
||
|
|
if ($this->pos >= $this->za->numFiles) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create a map of file names used in zip archive.
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function init_namelookup() {
|
||
|
|
if ($this->emptyziphack) {
|
||
|
|
$this->namelookup = array();
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!isset($this->za)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (isset($this->namelookup)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->namelookup = array();
|
||
|
|
|
||
|
|
if ($this->mode != file_archive::OPEN) {
|
||
|
|
// No need to tweak existing names when creating zip file because there are none yet!
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!file_exists($this->archivepathname)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!$fp = fopen($this->archivepathname, 'rb')) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (!$filesize = filesize($this->archivepathname)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
$centralend = self::zip_get_central_end($fp, $filesize);
|
||
|
|
|
||
|
|
if ($centralend === false or $centralend['disk'] !== 0 or $centralend['disk_start'] !== 0 or $centralend['offset'] === 0xFFFFFFFF) {
|
||
|
|
// Single disk archives only and o support for ZIP64, sorry.
|
||
|
|
fclose($fp);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
fseek($fp, $centralend['offset']);
|
||
|
|
$data = fread($fp, $centralend['size']);
|
||
|
|
$pos = 0;
|
||
|
|
$files = array();
|
||
|
|
for($i=0; $i<$centralend['entries']; $i++) {
|
||
|
|
$file = self::zip_parse_file_header($data, $centralend, $pos);
|
||
|
|
if ($file === false) {
|
||
|
|
// Wrong header, sorry.
|
||
|
|
fclose($fp);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
$files[] = $file;
|
||
|
|
}
|
||
|
|
fclose($fp);
|
||
|
|
|
||
|
|
foreach ($files as $file) {
|
||
|
|
$name = $file['name'];
|
||
|
|
if (preg_match('/^[a-zA-Z0-9_\-\.]*$/', $file['name'])) {
|
||
|
|
// No need to fix ASCII.
|
||
|
|
$name = fix_utf8($name);
|
||
|
|
|
||
|
|
} else if (!($file['general'] & pow(2, 11))) {
|
||
|
|
// First look for unicode name alternatives.
|
||
|
|
$found = false;
|
||
|
|
foreach($file['extra'] as $extra) {
|
||
|
|
if ($extra['id'] === 0x7075) {
|
||
|
|
$data = unpack('cversion/Vcrc', substr($extra['data'], 0, 5));
|
||
|
|
if ($data['crc'] === crc32($name)) {
|
||
|
|
$found = true;
|
||
|
|
$name = substr($extra['data'], 5);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$found and !empty($this->encoding) and $this->encoding !== 'utf-8') {
|
||
|
|
// Try the encoding from open().
|
||
|
|
$newname = @core_text::convert($name, $this->encoding, 'utf-8');
|
||
|
|
$original = core_text::convert($newname, 'utf-8', $this->encoding);
|
||
|
|
if ($original === $name) {
|
||
|
|
$found = true;
|
||
|
|
$name = $newname;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$found and $file['version'] === 0x315) {
|
||
|
|
// This looks like OS X build in zipper.
|
||
|
|
$newname = fix_utf8($name);
|
||
|
|
if ($newname === $name) {
|
||
|
|
$found = true;
|
||
|
|
$name = $newname;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$found and $file['version'] === 0) {
|
||
|
|
// This looks like our old borked Moodle 2.2 file.
|
||
|
|
$newname = fix_utf8($name);
|
||
|
|
if ($newname === $name) {
|
||
|
|
$found = true;
|
||
|
|
$name = $newname;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$found and $encoding = get_string('oldcharset', 'langconfig')) {
|
||
|
|
// Last attempt - try the dos/unix encoding from current language.
|
||
|
|
$windows = true;
|
||
|
|
foreach($file['extra'] as $extra) {
|
||
|
|
// In Windows archivers do not usually set any extras with the exception of NTFS flag in WinZip/WinRar.
|
||
|
|
$windows = false;
|
||
|
|
if ($extra['id'] === 0x000a) {
|
||
|
|
$windows = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($windows === true) {
|
||
|
|
switch(strtoupper($encoding)) {
|
||
|
|
case 'ISO-8859-1': $encoding = 'CP850'; break;
|
||
|
|
case 'ISO-8859-2': $encoding = 'CP852'; break;
|
||
|
|
case 'ISO-8859-4': $encoding = 'CP775'; break;
|
||
|
|
case 'ISO-8859-5': $encoding = 'CP866'; break;
|
||
|
|
case 'ISO-8859-6': $encoding = 'CP720'; break;
|
||
|
|
case 'ISO-8859-7': $encoding = 'CP737'; break;
|
||
|
|
case 'ISO-8859-8': $encoding = 'CP862'; break;
|
||
|
|
case 'WINDOWS-1251': $encoding = 'CP866'; break;
|
||
|
|
case 'EUC-JP':
|
||
|
|
case 'UTF-8':
|
||
|
|
if ($winchar = get_string('localewincharset', 'langconfig')) {
|
||
|
|
// Most probably works only for zh_cn,
|
||
|
|
// if there are more problems we could add zipcharset to langconfig files.
|
||
|
|
$encoding = $winchar;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$newname = @core_text::convert($name, $encoding, 'utf-8');
|
||
|
|
$original = core_text::convert($newname, 'utf-8', $encoding);
|
||
|
|
|
||
|
|
if ($original === $name) {
|
||
|
|
$name = $newname;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$name = str_replace('\\', '/', $name); // no MS \ separators
|
||
|
|
$name = clean_param($name, PARAM_PATH); // only safe chars
|
||
|
|
$name = ltrim($name, '/'); // no leading slash
|
||
|
|
|
||
|
|
if (function_exists('normalizer_normalize')) {
|
||
|
|
$name = normalizer_normalize($name, Normalizer::FORM_C);
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->namelookup[$file['name']] = $name;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add unicode flag to all files in archive.
|
||
|
|
*
|
||
|
|
* NOTE: single disk archives only, no ZIP64 support.
|
||
|
|
*
|
||
|
|
* @return bool success, modifies the file contents
|
||
|
|
*/
|
||
|
|
protected function fix_utf8_flags() {
|
||
|
|
if ($this->emptyziphack) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!file_exists($this->archivepathname)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Note: the ZIP structure is described at http://www.pkware.com/documents/casestudies/APPNOTE.TXT
|
||
|
|
if (!$fp = fopen($this->archivepathname, 'rb+')) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (!$filesize = filesize($this->archivepathname)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$centralend = self::zip_get_central_end($fp, $filesize);
|
||
|
|
|
||
|
|
if ($centralend === false or $centralend['disk'] !== 0 or $centralend['disk_start'] !== 0 or $centralend['offset'] === 0xFFFFFFFF) {
|
||
|
|
// Single disk archives only and o support for ZIP64, sorry.
|
||
|
|
fclose($fp);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
fseek($fp, $centralend['offset']);
|
||
|
|
$data = fread($fp, $centralend['size']);
|
||
|
|
$pos = 0;
|
||
|
|
$files = array();
|
||
|
|
for($i=0; $i<$centralend['entries']; $i++) {
|
||
|
|
$file = self::zip_parse_file_header($data, $centralend, $pos);
|
||
|
|
if ($file === false) {
|
||
|
|
// Wrong header, sorry.
|
||
|
|
fclose($fp);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$newgeneral = $file['general'] | pow(2, 11);
|
||
|
|
if ($newgeneral === $file['general']) {
|
||
|
|
// Nothing to do with this file.
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (preg_match('/^[a-zA-Z0-9_\-\.]*$/', $file['name'])) {
|
||
|
|
// ASCII file names are always ok.
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if ($file['extra']) {
|
||
|
|
// Most probably not created by php zip ext, better to skip it.
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (fix_utf8($file['name']) !== $file['name']) {
|
||
|
|
// Does not look like a valid utf-8 encoded file name, skip it.
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Read local file header.
|
||
|
|
fseek($fp, $file['local_offset']);
|
||
|
|
$localfile = unpack('Vsig/vversion_req/vgeneral/vmethod/vmtime/vmdate/Vcrc/Vsize_compressed/Vsize/vname_length/vextra_length', fread($fp, 30));
|
||
|
|
if ($localfile['sig'] !== 0x04034b50) {
|
||
|
|
// Borked file!
|
||
|
|
fclose($fp);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$file['local'] = $localfile;
|
||
|
|
$files[] = $file;
|
||
|
|
}
|
||
|
|
|
||
|
|
foreach ($files as $file) {
|
||
|
|
$localfile = $file['local'];
|
||
|
|
// Add the unicode flag in central file header.
|
||
|
|
fseek($fp, $file['central_offset'] + 8);
|
||
|
|
if (ftell($fp) === $file['central_offset'] + 8) {
|
||
|
|
$newgeneral = $file['general'] | pow(2, 11);
|
||
|
|
fwrite($fp, pack('v', $newgeneral));
|
||
|
|
}
|
||
|
|
// Modify local file header too.
|
||
|
|
fseek($fp, $file['local_offset'] + 6);
|
||
|
|
if (ftell($fp) === $file['local_offset'] + 6) {
|
||
|
|
$newgeneral = $localfile['general'] | pow(2, 11);
|
||
|
|
fwrite($fp, pack('v', $newgeneral));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fclose($fp);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Read end of central signature of ZIP file.
|
||
|
|
* @internal
|
||
|
|
* @static
|
||
|
|
* @param resource $fp
|
||
|
|
* @param int $filesize
|
||
|
|
* @return array|bool
|
||
|
|
*/
|
||
|
|
public static function zip_get_central_end($fp, $filesize) {
|
||
|
|
// Find end of central directory record.
|
||
|
|
fseek($fp, $filesize - 22);
|
||
|
|
$info = unpack('Vsig', fread($fp, 4));
|
||
|
|
if ($info['sig'] === 0x06054b50) {
|
||
|
|
// There is no comment.
|
||
|
|
fseek($fp, $filesize - 22);
|
||
|
|
$data = fread($fp, 22);
|
||
|
|
} else {
|
||
|
|
// There is some comment with 0xFF max size - that is 65557.
|
||
|
|
fseek($fp, $filesize - 65557);
|
||
|
|
$data = fread($fp, 65557);
|
||
|
|
}
|
||
|
|
|
||
|
|
$pos = strpos($data, pack('V', 0x06054b50));
|
||
|
|
if ($pos === false) {
|
||
|
|
// Borked ZIP structure!
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$centralend = unpack('Vsig/vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_length', substr($data, $pos, 22));
|
||
|
|
if ($centralend['comment_length']) {
|
||
|
|
$centralend['comment'] = substr($data, 22, $centralend['comment_length']);
|
||
|
|
} else {
|
||
|
|
$centralend['comment'] = '';
|
||
|
|
}
|
||
|
|
|
||
|
|
return $centralend;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Parse file header.
|
||
|
|
* @internal
|
||
|
|
* @param string $data
|
||
|
|
* @param array $centralend
|
||
|
|
* @param int $pos (modified)
|
||
|
|
* @return array|bool file info
|
||
|
|
*/
|
||
|
|
public static function zip_parse_file_header($data, $centralend, &$pos) {
|
||
|
|
$file = unpack('Vsig/vversion/vversion_req/vgeneral/vmethod/Vmodified/Vcrc/Vsize_compressed/Vsize/vname_length/vextra_length/vcomment_length/vdisk/vattr/Vattrext/Vlocal_offset', substr($data, $pos, 46));
|
||
|
|
$file['central_offset'] = $centralend['offset'] + $pos;
|
||
|
|
$pos = $pos + 46;
|
||
|
|
if ($file['sig'] !== 0x02014b50) {
|
||
|
|
// Borked ZIP structure!
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$file['name'] = substr($data, $pos, $file['name_length']);
|
||
|
|
$pos = $pos + $file['name_length'];
|
||
|
|
$file['extra'] = array();
|
||
|
|
$file['extra_data'] = '';
|
||
|
|
if ($file['extra_length']) {
|
||
|
|
$extradata = substr($data, $pos, $file['extra_length']);
|
||
|
|
$file['extra_data'] = $extradata;
|
||
|
|
while (strlen($extradata) > 4) {
|
||
|
|
$extra = unpack('vid/vsize', substr($extradata, 0, 4));
|
||
|
|
$extra['data'] = substr($extradata, 4, $extra['size']);
|
||
|
|
$extradata = substr($extradata, 4+$extra['size']);
|
||
|
|
$file['extra'][] = $extra;
|
||
|
|
}
|
||
|
|
$pos = $pos + $file['extra_length'];
|
||
|
|
}
|
||
|
|
if ($file['comment_length']) {
|
||
|
|
$pos = $pos + $file['comment_length'];
|
||
|
|
$file['comment'] = substr($data, $pos, $file['comment_length']);
|
||
|
|
} else {
|
||
|
|
$file['comment'] = '';
|
||
|
|
}
|
||
|
|
return $file;
|
||
|
|
}
|
||
|
|
}
|