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

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at http://getid3.sourceforge.net                 //
   5 //            or http://www.getid3.org                         //
   6 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.archive.zip.php                                      //
  12 // module for analyzing pkZip files                            //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_zip extends getid3_handler
  19 {
  20
  21         public function Analyze() {
  22                 $info = &$this->getid3->info;
  23
  24                 $info['fileformat']      = 'zip';
  25                 $info['zip']['encoding'] = 'ISO-8859-1';
  26                 $info['zip']['files']    = array();
  27
  28                 $info['zip']['compressed_size']   = 0;
  29                 $info['zip']['uncompressed_size'] = 0;
  30                 $info['zip']['entries_count']     = 0;
  31
  32                 if (!getid3_lib::intValueSupported($info['filesize'])) {
  33                         $this->error('File is larger than '.round(PHP_INT_MAX / 1073741824).'GB, not supported by PHP');
  34                         return false;
  35                 } else {
  36                         $EOCDsearchData    = '';
  37                         $EOCDsearchCounter = 0;
  38                         while ($EOCDsearchCounter++ < 512) {
  39
  40                                 $this->fseek(-128 * $EOCDsearchCounter, SEEK_END);
  41                                 $EOCDsearchData = $this->fread(128).$EOCDsearchData;
  42
  43                                 if (strstr($EOCDsearchData, 'PK'."\x05\x06")) {
  44
  45                                         $EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06");
  46                                         $this->fseek((-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END);
  47                                         $info['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory();
  48
  49                                         $this->fseek($info['zip']['end_central_directory']['directory_offset']);
  50                                         $info['zip']['entries_count'] = 0;
  51                                         while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($this->getid3->fp)) {
  52                                                 $info['zip']['central_directory'][] = $centraldirectoryentry;
  53                                                 $info['zip']['entries_count']++;
  54                                                 $info['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
  55                                                 $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
  56
  57                                                 //if ($centraldirectoryentry['uncompressed_size'] > 0) { zero-byte files are valid
  58                                                 if (!empty($centraldirectoryentry['filename'])) {
  59                                                         $info['zip']['files'] = getid3_lib::array_merge_clobber($info['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size']));
  60                                                 }
  61                                         }
  62
  63                                         if ($info['zip']['entries_count'] == 0) {
  64                                                 $this->error('No Central Directory entries found (truncated file?)');
  65                                                 return false;
  66                                         }
  67
  68                                         if (!empty($info['zip']['end_central_directory']['comment'])) {
  69                                                 $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment'];
  70                                         }
  71
  72                                         if (isset($info['zip']['central_directory'][0]['compression_method'])) {
  73                                                 $info['zip']['compression_method'] = $info['zip']['central_directory'][0]['compression_method'];
  74                                         }
  75                                         if (isset($info['zip']['central_directory'][0]['flags']['compression_speed'])) {
  76                                                 $info['zip']['compression_speed']  = $info['zip']['central_directory'][0]['flags']['compression_speed'];
  77                                         }
  78                                         if (isset($info['zip']['compression_method']) && ($info['zip']['compression_method'] == 'store') && !isset($info['zip']['compression_speed'])) {
  79                                                 $info['zip']['compression_speed']  = 'store';
  80                                         }
  81
  82                                         // secondary check - we (should) already have all the info we NEED from the Central Directory above, but scanning each
  83                                         // Local File Header entry will
  84                                         foreach ($info['zip']['central_directory'] as $central_directory_entry) {
  85                                                 $this->fseek($central_directory_entry['entry_offset']);
  86                                                 if ($fileentry = $this->ZIPparseLocalFileHeader()) {
  87                                                         $info['zip']['entries'][] = $fileentry;
  88                                                 } else {
  89                                                         $this->warning('Error parsing Local File Header at offset '.$central_directory_entry['entry_offset']);
  90                                                 }
  91                                         }
  92
  93                                         if (!empty($info['zip']['files']['[Content_Types].xml']) &&
  94                                             !empty($info['zip']['files']['_rels']['.rels'])      &&
  95                                             !empty($info['zip']['files']['docProps']['app.xml']) &&
  96                                             !empty($info['zip']['files']['docProps']['core.xml'])) {
  97                                                    // http://technet.microsoft.com/en-us/library/cc179224.aspx
  98                                                    $info['fileformat'] = 'zip.msoffice';
  99                                                    if (!empty($ThisFileInfo['zip']['files']['ppt'])) {
 100                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
 101                                                    } elseif (!empty($ThisFileInfo['zip']['files']['xl'])) {
 102                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
 103                                                    } elseif (!empty($ThisFileInfo['zip']['files']['word'])) {
 104                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
 105                                                    }
 106                                         }
 107
 108                                         return true;
 109                                 }
 110                         }
 111                 }
 112
 113                 if (!$this->getZIPentriesFilepointer()) {
 114                         unset($info['zip']);
 115                         $info['fileformat'] = '';
 116                         $this->error('Cannot find End Of Central Directory (truncated file?)');
 117                         return false;
 118                 }
 119
 120                 // central directory couldn't be found and/or parsed
 121                 // scan through actual file data entries, recover as much as possible from probable trucated file
 122                 if ($info['zip']['compressed_size'] > ($info['filesize'] - 46 - 22)) {
 123                         $this->error('Warning: Truncated file! - Total compressed file sizes ('.$info['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($info['filesize'] - 46 - 22).' bytes)');
 124                 }
 125                 $this->error('Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete');
 126                 foreach ($info['zip']['entries'] as $key => $valuearray) {
 127                         $info['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size'];
 128                 }
 129                 return true;
 130         }
 131
 132
 133         public function getZIPHeaderFilepointerTopDown() {
 134                 $info = &$this->getid3->info;
 135
 136                 $info['fileformat'] = 'zip';
 137
 138                 $info['zip']['compressed_size']   = 0;
 139                 $info['zip']['uncompressed_size'] = 0;
 140                 $info['zip']['entries_count']     = 0;
 141
 142                 rewind($this->getid3->fp);
 143                 while ($fileentry = $this->ZIPparseLocalFileHeader()) {
 144                         $info['zip']['entries'][] = $fileentry;
 145                         $info['zip']['entries_count']++;
 146                 }
 147                 if ($info['zip']['entries_count'] == 0) {
 148                         $this->error('No Local File Header entries found');
 149                         return false;
 150                 }
 151
 152                 $info['zip']['entries_count']     = 0;
 153                 while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($this->getid3->fp)) {
 154                         $info['zip']['central_directory'][] = $centraldirectoryentry;
 155                         $info['zip']['entries_count']++;
 156                         $info['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
 157                         $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
 158                 }
 159                 if ($info['zip']['entries_count'] == 0) {
 160                         $this->error('No Central Directory entries found (truncated file?)');
 161                         return false;
 162                 }
 163
 164                 if ($EOCD = $this->ZIPparseEndOfCentralDirectory()) {
 165                         $info['zip']['end_central_directory'] = $EOCD;
 166                 } else {
 167                         $this->error('No End Of Central Directory entry found (truncated file?)');
 168                         return false;
 169                 }
 170
 171                 if (!empty($info['zip']['end_central_directory']['comment'])) {
 172                         $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment'];
 173                 }
 174
 175                 return true;
 176         }
 177
 178
 179         public function getZIPentriesFilepointer() {
 180                 $info = &$this->getid3->info;
 181
 182                 $info['zip']['compressed_size']   = 0;
 183                 $info['zip']['uncompressed_size'] = 0;
 184                 $info['zip']['entries_count']     = 0;
 185
 186                 rewind($this->getid3->fp);
 187                 while ($fileentry = $this->ZIPparseLocalFileHeader()) {
 188                         $info['zip']['entries'][] = $fileentry;
 189                         $info['zip']['entries_count']++;
 190                         $info['zip']['compressed_size']   += $fileentry['compressed_size'];
 191                         $info['zip']['uncompressed_size'] += $fileentry['uncompressed_size'];
 192                 }
 193                 if ($info['zip']['entries_count'] == 0) {
 194                         $this->error('No Local File Header entries found');
 195                         return false;
 196                 }
 197
 198                 return true;
 199         }
 200
 201
 202         public function ZIPparseLocalFileHeader() {
 203                 $LocalFileHeader['offset'] = $this->ftell();
 204
 205                 $ZIPlocalFileHeader = $this->fread(30);
 206
 207                 $LocalFileHeader['raw']['signature']          = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  0, 4));
 208                 if ($LocalFileHeader['raw']['signature'] != 0x04034B50) { // "PK\x03\x04"
 209                         // invalid Local File Header Signature
 210                         $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly
 211                         return false;
 212                 }
 213                 $LocalFileHeader['raw']['extract_version']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  4, 2));
 214                 $LocalFileHeader['raw']['general_flags']      = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  6, 2));
 215                 $LocalFileHeader['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  8, 2));
 216                 $LocalFileHeader['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 10, 2));
 217                 $LocalFileHeader['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 12, 2));
 218                 $LocalFileHeader['raw']['crc_32']             = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 14, 4));
 219                 $LocalFileHeader['raw']['compressed_size']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 18, 4));
 220                 $LocalFileHeader['raw']['uncompressed_size']  = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 22, 4));
 221                 $LocalFileHeader['raw']['filename_length']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 26, 2));
 222                 $LocalFileHeader['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 28, 2));
 223
 224                 $LocalFileHeader['extract_version']           = sprintf('%1.1f', $LocalFileHeader['raw']['extract_version'] / 10);
 225                 $LocalFileHeader['host_os']                   = $this->ZIPversionOSLookup(($LocalFileHeader['raw']['extract_version'] & 0xFF00) >> 8);
 226                 $LocalFileHeader['compression_method']        = $this->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']);
 227                 $LocalFileHeader['compressed_size']           = $LocalFileHeader['raw']['compressed_size'];
 228                 $LocalFileHeader['uncompressed_size']         = $LocalFileHeader['raw']['uncompressed_size'];
 229                 $LocalFileHeader['flags']                     = $this->ZIPparseGeneralPurposeFlags($LocalFileHeader['raw']['general_flags'], $LocalFileHeader['raw']['compression_method']);
 230                 $LocalFileHeader['last_modified_timestamp']   = $this->DOStime2UNIXtime($LocalFileHeader['raw']['last_mod_file_date'], $LocalFileHeader['raw']['last_mod_file_time']);
 231
 232                 $FilenameExtrafieldLength = $LocalFileHeader['raw']['filename_length'] + $LocalFileHeader['raw']['extra_field_length'];
 233                 if ($FilenameExtrafieldLength > 0) {
 234                         $ZIPlocalFileHeader .= $this->fread($FilenameExtrafieldLength);
 235
 236                         if ($LocalFileHeader['raw']['filename_length'] > 0) {
 237                                 $LocalFileHeader['filename']                = substr($ZIPlocalFileHeader, 30, $LocalFileHeader['raw']['filename_length']);
 238                         }
 239                         if ($LocalFileHeader['raw']['extra_field_length'] > 0) {
 240                                 $LocalFileHeader['raw']['extra_field_data'] = substr($ZIPlocalFileHeader, 30 + $LocalFileHeader['raw']['filename_length'], $LocalFileHeader['raw']['extra_field_length']);
 241                         }
 242                 }
 243
 244                 if ($LocalFileHeader['compressed_size'] == 0) {
 245                         // *Could* be a zero-byte file
 246                         // But could also be a file written on the fly that didn't know compressed filesize beforehand.
 247                         // Correct compressed filesize should be in the data_descriptor located after this file data, and also in Central Directory (at end of zip file)
 248                         if (!empty($this->getid3->info['zip']['central_directory'])) {
 249                                 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) {
 250                                         if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) {
 251                                                 if ($central_directory_entry['compressed_size'] > 0) {
 252                                                         // overwrite local zero value (but not ['raw']'compressed_size']) so that seeking for data_descriptor (and next file entry) works correctly
 253                                                         $LocalFileHeader['compressed_size'] = $central_directory_entry['compressed_size'];
 254                                                 }
 255                                                 break;
 256                                         }
 257                                 }
 258                         }
 259
 260                 }
 261                 $LocalFileHeader['data_offset'] = $this->ftell();
 262                 $this->fseek($LocalFileHeader['compressed_size'], SEEK_CUR); // this should (but may not) match value in $LocalFileHeader['raw']['compressed_size'] -- $LocalFileHeader['compressed_size'] could have been overwritten above with value from Central Directory
 263
 264                 if ($LocalFileHeader['flags']['data_descriptor_used']) {
 265                         $DataDescriptor = $this->fread(16);
 266                         $LocalFileHeader['data_descriptor']['signature']         = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  0, 4));
 267                         if ($LocalFileHeader['data_descriptor']['signature'] != 0x08074B50) { // "PK\x07\x08"
 268                                 $this->getid3->warning[] = 'invalid Local File Header Data Descriptor Signature at offset '.($this->ftell() - 16).' - expecting 08 07 4B 50, found '.getid3_lib::PrintHexBytes($LocalFileHeader['data_descriptor']['signature']);
 269                                 $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly
 270                                 return false;
 271                         }
 272                         $LocalFileHeader['data_descriptor']['crc_32']            = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  4, 4));
 273                         $LocalFileHeader['data_descriptor']['compressed_size']   = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  8, 4));
 274                         $LocalFileHeader['data_descriptor']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 12, 4));
 275                         if (!$LocalFileHeader['raw']['compressed_size'] && $LocalFileHeader['data_descriptor']['compressed_size']) {
 276                                 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) {
 277                                         if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) {
 278                                                 if ($LocalFileHeader['data_descriptor']['compressed_size'] == $central_directory_entry['compressed_size']) {
 279                                                         // $LocalFileHeader['compressed_size'] already set from Central Directory
 280                                                 } else {
 281                                                         $this->warning('conflicting compressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['compressed_size'].') vs Central Directory ('.$central_directory_entry['compressed_size'].') for file at offset '.$LocalFileHeader['offset']);
 282                                                 }
 283
 284                                                 if ($LocalFileHeader['data_descriptor']['uncompressed_size'] == $central_directory_entry['uncompressed_size']) {
 285                                                         $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['data_descriptor']['uncompressed_size'];
 286                                                 } else {
 287                                                         $this->warning('conflicting uncompressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['uncompressed_size'].') vs Central Directory ('.$central_directory_entry['uncompressed_size'].') for file at offset '.$LocalFileHeader['offset']);
 288                                                 }
 289                                                 break;
 290                                         }
 291                                 }
 292                         }
 293                 }
 294                 return $LocalFileHeader;
 295         }
 296
 297
 298         public function ZIPparseCentralDirectory() {
 299                 $CentralDirectory['offset'] = $this->ftell();
 300
 301                 $ZIPcentralDirectory = $this->fread(46);
 302
 303                 $CentralDirectory['raw']['signature']            = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  0, 4));
 304                 if ($CentralDirectory['raw']['signature'] != 0x02014B50) {
 305                         // invalid Central Directory Signature
 306                         $this->fseek($CentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly
 307                         return false;
 308                 }
 309                 $CentralDirectory['raw']['create_version']       = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  4, 2));
 310                 $CentralDirectory['raw']['extract_version']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  6, 2));
 311                 $CentralDirectory['raw']['general_flags']        = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  8, 2));
 312                 $CentralDirectory['raw']['compression_method']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 10, 2));
 313                 $CentralDirectory['raw']['last_mod_file_time']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 12, 2));
 314                 $CentralDirectory['raw']['last_mod_file_date']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 14, 2));
 315                 $CentralDirectory['raw']['crc_32']               = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 16, 4));
 316                 $CentralDirectory['raw']['compressed_size']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 20, 4));
 317                 $CentralDirectory['raw']['uncompressed_size']    = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 24, 4));
 318                 $CentralDirectory['raw']['filename_length']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 28, 2));
 319                 $CentralDirectory['raw']['extra_field_length']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 30, 2));
 320                 $CentralDirectory['raw']['file_comment_length']  = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 32, 2));
 321                 $CentralDirectory['raw']['disk_number_start']    = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 34, 2));
 322                 $CentralDirectory['raw']['internal_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 36, 2));
 323                 $CentralDirectory['raw']['external_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 38, 4));
 324                 $CentralDirectory['raw']['local_header_offset']  = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 42, 4));
 325
 326                 $CentralDirectory['entry_offset']              = $CentralDirectory['raw']['local_header_offset'];
 327                 $CentralDirectory['create_version']            = sprintf('%1.1f', $CentralDirectory['raw']['create_version'] / 10);
 328                 $CentralDirectory['extract_version']           = sprintf('%1.1f', $CentralDirectory['raw']['extract_version'] / 10);
 329                 $CentralDirectory['host_os']                   = $this->ZIPversionOSLookup(($CentralDirectory['raw']['extract_version'] & 0xFF00) >> 8);
 330                 $CentralDirectory['compression_method']        = $this->ZIPcompressionMethodLookup($CentralDirectory['raw']['compression_method']);
 331                 $CentralDirectory['compressed_size']           = $CentralDirectory['raw']['compressed_size'];
 332                 $CentralDirectory['uncompressed_size']         = $CentralDirectory['raw']['uncompressed_size'];
 333                 $CentralDirectory['flags']                     = $this->ZIPparseGeneralPurposeFlags($CentralDirectory['raw']['general_flags'], $CentralDirectory['raw']['compression_method']);
 334                 $CentralDirectory['last_modified_timestamp']   = $this->DOStime2UNIXtime($CentralDirectory['raw']['last_mod_file_date'], $CentralDirectory['raw']['last_mod_file_time']);
 335
 336                 $FilenameExtrafieldCommentLength = $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'] + $CentralDirectory['raw']['file_comment_length'];
 337                 if ($FilenameExtrafieldCommentLength > 0) {
 338                         $FilenameExtrafieldComment = $this->fread($FilenameExtrafieldCommentLength);
 339
 340                         if ($CentralDirectory['raw']['filename_length'] > 0) {
 341                                 $CentralDirectory['filename']                  = substr($FilenameExtrafieldComment, 0, $CentralDirectory['raw']['filename_length']);
 342                         }
 343                         if ($CentralDirectory['raw']['extra_field_length'] > 0) {
 344                                 $CentralDirectory['raw']['extra_field_data']   = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'], $CentralDirectory['raw']['extra_field_length']);
 345                         }
 346                         if ($CentralDirectory['raw']['file_comment_length'] > 0) {
 347                                 $CentralDirectory['file_comment']              = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'], $CentralDirectory['raw']['file_comment_length']);
 348                         }
 349                 }
 350
 351                 return $CentralDirectory;
 352         }
 353
 354         public function ZIPparseEndOfCentralDirectory() {
 355                 $EndOfCentralDirectory['offset'] = $this->ftell();
 356
 357                 $ZIPendOfCentralDirectory = $this->fread(22);
 358
 359                 $EndOfCentralDirectory['signature']                   = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  0, 4));
 360                 if ($EndOfCentralDirectory['signature'] != 0x06054B50) {
 361                         // invalid End Of Central Directory Signature
 362                         $this->fseek($EndOfCentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly
 363                         return false;
 364                 }
 365                 $EndOfCentralDirectory['disk_number_current']         = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  4, 2));
 366                 $EndOfCentralDirectory['disk_number_start_directory'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  6, 2));
 367                 $EndOfCentralDirectory['directory_entries_this_disk'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  8, 2));
 368                 $EndOfCentralDirectory['directory_entries_total']     = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 10, 2));
 369                 $EndOfCentralDirectory['directory_size']              = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 12, 4));
 370                 $EndOfCentralDirectory['directory_offset']            = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 16, 4));
 371                 $EndOfCentralDirectory['comment_length']              = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 20, 2));
 372
 373                 if ($EndOfCentralDirectory['comment_length'] > 0) {
 374                         $EndOfCentralDirectory['comment']                 = $this->fread($EndOfCentralDirectory['comment_length']);
 375                 }
 376
 377                 return $EndOfCentralDirectory;
 378         }
 379
 380
 381         public static function ZIPparseGeneralPurposeFlags($flagbytes, $compressionmethod) {
 382                 // https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip-printable.html
 383                 $ParsedFlags['encrypted']               = (bool) ($flagbytes & 0x0001);
 384                 //                                                             0x0002 -- see below
 385                 //                                                             0x0004 -- see below
 386                 $ParsedFlags['data_descriptor_used']    = (bool) ($flagbytes & 0x0008);
 387                 $ParsedFlags['enhanced_deflation']      = (bool) ($flagbytes & 0x0010);
 388                 $ParsedFlags['compressed_patched_data'] = (bool) ($flagbytes & 0x0020);
 389                 $ParsedFlags['strong_encryption']       = (bool) ($flagbytes & 0x0040);
 390                 //                                                             0x0080 - unused
 391                 //                                                             0x0100 - unused
 392                 //                                                             0x0200 - unused
 393                 //                                                             0x0400 - unused
 394                 $ParsedFlags['language_encoding']       = (bool) ($flagbytes & 0x0800);
 395                 //                                                             0x1000 - reserved
 396                 $ParsedFlags['mask_header_values']      = (bool) ($flagbytes & 0x2000);
 397                 //                                                             0x4000 - reserved
 398                 //                                                             0x8000 - reserved
 399
 400                 switch ($compressionmethod) {
 401                         case 6:
 402                                 $ParsedFlags['dictionary_size']    = (($flagbytes & 0x0002) ? 8192 : 4096);
 403                                 $ParsedFlags['shannon_fano_trees'] = (($flagbytes & 0x0004) ? 3    : 2);
 404                                 break;
 405
 406                         case 8:
 407                         case 9:
 408                                 switch (($flagbytes & 0x0006) >> 1) {
 409                                         case 0:
 410                                                 $ParsedFlags['compression_speed'] = 'normal';
 411                                                 break;
 412                                         case 1:
 413                                                 $ParsedFlags['compression_speed'] = 'maximum';
 414                                                 break;
 415                                         case 2:
 416                                                 $ParsedFlags['compression_speed'] = 'fast';
 417                                                 break;
 418                                         case 3:
 419                                                 $ParsedFlags['compression_speed'] = 'superfast';
 420                                                 break;
 421                                 }
 422                                 break;
 423                 }
 424
 425                 return $ParsedFlags;
 426         }
 427
 428
 429         public static function ZIPversionOSLookup($index) {
 430                 static $ZIPversionOSLookup = array(
 431                         0  => 'MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems)',
 432                         1  => 'Amiga',
 433                         2  => 'OpenVMS',
 434                         3  => 'Unix',
 435                         4  => 'VM/CMS',
 436                         5  => 'Atari ST',
 437                         6  => 'OS/2 H.P.F.S.',
 438                         7  => 'Macintosh',
 439                         8  => 'Z-System',
 440                         9  => 'CP/M',
 441                         10 => 'Windows NTFS',
 442                         11 => 'MVS',
 443                         12 => 'VSE',
 444                         13 => 'Acorn Risc',
 445                         14 => 'VFAT',
 446                         15 => 'Alternate MVS',
 447                         16 => 'BeOS',
 448                         17 => 'Tandem',
 449                         18 => 'OS/400',
 450                         19 => 'OS/X (Darwin)',
 451                 );
 452
 453                 return (isset($ZIPversionOSLookup[$index]) ? $ZIPversionOSLookup[$index] : '[unknown]');
 454         }
 455
 456         public static function ZIPcompressionMethodLookup($index) {
 457                 // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/ZIP.html
 458                 static $ZIPcompressionMethodLookup = array(
 459                         0  => 'store',
 460                         1  => 'shrink',
 461                         2  => 'reduce-1',
 462                         3  => 'reduce-2',
 463                         4  => 'reduce-3',
 464                         5  => 'reduce-4',
 465                         6  => 'implode',
 466                         7  => 'tokenize',
 467                         8  => 'deflate',
 468                         9  => 'deflate64',
 469                         10 => 'Imploded (old IBM TERSE)',
 470                         11 => 'RESERVED[11]',
 471                         12 => 'BZIP2',
 472                         13 => 'RESERVED[13]',
 473                         14 => 'LZMA (EFS)',
 474                         15 => 'RESERVED[15]',
 475                         16 => 'RESERVED[16]',
 476                         17 => 'RESERVED[17]',
 477                         18 => 'IBM TERSE (new)',
 478                         19 => 'IBM LZ77 z Architecture (PFS)',
 479                         96 => 'JPEG recompressed',
 480                         97 => 'WavPack compressed',
 481                         98 => 'PPMd version I, Rev 1',
 482                 );
 483
 484                 return (isset($ZIPcompressionMethodLookup[$index]) ? $ZIPcompressionMethodLookup[$index] : '[unknown]');
 485         }
 486
 487         public static function DOStime2UNIXtime($DOSdate, $DOStime) {
 488                 // wFatDate
 489                 // Specifies the MS-DOS date. The date is a packed 16-bit value with the following format:
 490                 // Bits      Contents
 491                 // 0-4    Day of the month (1-31)
 492                 // 5-8    Month (1 = January, 2 = February, and so on)
 493                 // 9-15   Year offset from 1980 (add 1980 to get actual year)
 494
 495                 $UNIXday    =  ($DOSdate & 0x001F);
 496                 $UNIXmonth  = (($DOSdate & 0x01E0) >> 5);
 497                 $UNIXyear   = (($DOSdate & 0xFE00) >> 9) + 1980;
 498
 499                 // wFatTime
 500                 // Specifies the MS-DOS time. The time is a packed 16-bit value with the following format:
 501                 // Bits   Contents
 502                 // 0-4    Second divided by 2
 503                 // 5-10   Minute (0-59)
 504                 // 11-15  Hour (0-23 on a 24-hour clock)
 505
 506                 $UNIXsecond =  ($DOStime & 0x001F) * 2;
 507                 $UNIXminute = (($DOStime & 0x07E0) >> 5);
 508                 $UNIXhour   = (($DOStime & 0xF800) >> 11);
 509
 510                 return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
 511         }
 512
 513 }