1<?php
2
3/////////////////////////////////////////////////////////////////
4/// getID3() by James Heinrich <info@getid3.org>               //
5//  available at https://github.com/JamesHeinrich/getID3       //
6//            or https://www.getid3.org                        //
7//            or http://getid3.sourceforge.net                 //
8//  see readme.txt for more details                            //
9/////////////////////////////////////////////////////////////////
10//                                                             //
11// module.archive.szip.php                                     //
12// module for analyzing SZIP compressed files                  //
13// dependencies: NONE                                          //
14//                                                            ///
15/////////////////////////////////////////////////////////////////
16
17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
18	exit;
19}
20
21class getid3_szip extends getid3_handler
22{
23	/**
24	 * @return bool
25	 */
26	public function Analyze() {
27		$info = &$this->getid3->info;
28
29		$this->fseek($info['avdataoffset']);
30		$SZIPHeader = $this->fread(6);
31		if (substr($SZIPHeader, 0, 4) != "SZ\x0A\x04") {
32			$this->error('Expecting "53 5A 0A 04" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($SZIPHeader, 0, 4)).'"');
33			return false;
34		}
35		$info['fileformat']            = 'szip';
36		$info['szip']['major_version'] = getid3_lib::BigEndian2Int(substr($SZIPHeader, 4, 1));
37		$info['szip']['minor_version'] = getid3_lib::BigEndian2Int(substr($SZIPHeader, 5, 1));
38		$this->error('SZIP parsing not enabled in this version of getID3() ['.$this->getid3->version().']');
39		return false;
40
41		while (!$this->feof()) {
42			$NextBlockID = $this->fread(2);
43			switch ($NextBlockID) {
44				case 'SZ':
45					// Note that szip files can be concatenated, this has the same effect as
46					// concatenating the files. this also means that global header blocks
47					// might be present between directory/data blocks.
48					$this->fseek(4, SEEK_CUR);
49					break;
50
51				case 'BH':
52					$BHheaderbytes  = getid3_lib::BigEndian2Int($this->fread(3));
53					$BHheaderdata   = $this->fread($BHheaderbytes);
54					$BHheaderoffset = 0;
55					while (strpos($BHheaderdata, "\x00", $BHheaderoffset) > 0) {
56						//filename as \0 terminated string  (empty string indicates end)
57						//owner as \0 terminated string (empty is same as last file)
58						//group as \0 terminated string (empty is same as last file)
59						//3 byte filelength in this block
60						//2 byte access flags
61						//4 byte creation time (like in unix)
62						//4 byte modification time (like in unix)
63						//4 byte access time (like in unix)
64
65						$BHdataArray['filename'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
66						$BHheaderoffset += (strlen($BHdataArray['filename']) + 1);
67
68						$BHdataArray['owner'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
69						$BHheaderoffset += (strlen($BHdataArray['owner']) + 1);
70
71						$BHdataArray['group'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
72						$BHheaderoffset += (strlen($BHdataArray['group']) + 1);
73
74						$BHdataArray['filelength'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 3));
75						$BHheaderoffset += 3;
76
77						$BHdataArray['access_flags'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 2));
78						$BHheaderoffset += 2;
79
80						$BHdataArray['creation_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
81						$BHheaderoffset += 4;
82
83						$BHdataArray['modification_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
84						$BHheaderoffset += 4;
85
86						$BHdataArray['access_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
87						$BHheaderoffset += 4;
88
89						$info['szip']['BH'][] = $BHdataArray;
90					}
91					break;
92
93				default:
94					break 2;
95			}
96		}
97
98		return true;
99
100	}
101
102}
103