www/plugins-dist/medias/lib/getid3/module.archive.szip.php

   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
  17 if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
  18         exit;
  19 }
  20
  21 class 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 }