www/plugins-dist/medias/lib/getid3/module.archive.zip.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.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          * @return bool
  22          */
  23         public function Analyze() {
  24                 $info = &$this->getid3->info;
  25
  26                 $info['fileformat']      = 'zip';
  27                 $info['zip']['encoding'] = 'ISO-8859-1';
  28                 $info['zip']['files']    = array();
  29
  30                 $info['zip']['compressed_size']   = 0;
  31                 $info['zip']['uncompressed_size'] = 0;
  32                 $info['zip']['entries_count']     = 0;
  33
  34                 if (!getid3_lib::intValueSupported($info['filesize'])) {
  35                         $this->error('File is larger than '.round(PHP_INT_MAX / 1073741824).'GB, not supported by PHP');
  36                         return false;
  37                 } else {
  38                         $EOCDsearchData    = '';
  39                         $EOCDsearchCounter = 0;
  40                         while ($EOCDsearchCounter++ < 512) {
  41
  42                                 $this->fseek(-128 * $EOCDsearchCounter, SEEK_END);
  43                                 $EOCDsearchData = $this->fread(128).$EOCDsearchData;
  44
  45                                 if (strstr($EOCDsearchData, 'PK'."\x05\x06")) {
  46
  47                                         $EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06");
  48                                         $this->fseek((-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END);
  49                                         $info['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory();
  50
  51                                         $this->fseek($info['zip']['end_central_directory']['directory_offset']);
  52                                         $info['zip']['entries_count'] = 0;
  53                                         while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) {
  54                                                 $info['zip']['central_directory'][] = $centraldirectoryentry;
  55                                                 $info['zip']['entries_count']++;
  56                                                 $info['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
  57                                                 $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
  58
  59                                                 //if ($centraldirectoryentry['uncompressed_size'] > 0) { zero-byte files are valid
  60                                                 if (!empty($centraldirectoryentry['filename'])) {
  61                                                         $info['zip']['files'] = getid3_lib::array_merge_clobber($info['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size']));
  62                                                 }
  63                                         }
  64
  65                                         if ($info['zip']['entries_count'] == 0) {
  66                                                 $this->error('No Central Directory entries found (truncated file?)');
  67                                                 return false;
  68                                         }
  69
  70                                         if (!empty($info['zip']['end_central_directory']['comment'])) {
  71                                                 $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment'];
  72                                         }
  73
  74                                         if (isset($info['zip']['central_directory'][0]['compression_method'])) {
  75                                                 $info['zip']['compression_method'] = $info['zip']['central_directory'][0]['compression_method'];
  76                                         }
  77                                         if (isset($info['zip']['central_directory'][0]['flags']['compression_speed'])) {
  78                                                 $info['zip']['compression_speed']  = $info['zip']['central_directory'][0]['flags']['compression_speed'];
  79                                         }
  80                                         if (isset($info['zip']['compression_method']) && ($info['zip']['compression_method'] == 'store') && !isset($info['zip']['compression_speed'])) {
  81                                                 $info['zip']['compression_speed']  = 'store';
  82                                         }
  83
  84                                         // secondary check - we (should) already have all the info we NEED from the Central Directory above, but scanning each
  85                                         // Local File Header entry will
  86                                         foreach ($info['zip']['central_directory'] as $central_directory_entry) {
  87                                                 $this->fseek($central_directory_entry['entry_offset']);
  88                                                 if ($fileentry = $this->ZIPparseLocalFileHeader()) {
  89                                                         $info['zip']['entries'][] = $fileentry;
  90                                                 } else {
  91                                                         $this->warning('Error parsing Local File Header at offset '.$central_directory_entry['entry_offset']);
  92                                                 }
  93                                         }
  94
  95                                         if (!empty($info['zip']['files']['[Content_Types].xml']) &&
  96                                             !empty($info['zip']['files']['_rels']['.rels'])      &&
  97                                             !empty($info['zip']['files']['docProps']['app.xml']) &&
  98                                             !empty($info['zip']['files']['docProps']['core.xml'])) {
  99                                                    // http://technet.microsoft.com/en-us/library/cc179224.aspx
 100                                                    $info['fileformat'] = 'zip.msoffice';
 101                                                    if (!empty($ThisFileInfo['zip']['files']['ppt'])) {
 102                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
 103                                                    } elseif (!empty($ThisFileInfo['zip']['files']['xl'])) {
 104                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
 105                                                    } elseif (!empty($ThisFileInfo['zip']['files']['word'])) {
 106                                                       $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
 107                                                    }
 108                                         }
 109
 110                                         return true;
 111                                 }
 112                         }
 113                 }
 114
 115                 if (!$this->getZIPentriesFilepointer()) {
 116                         unset($info['zip']);
 117                         $info['fileformat'] = '';
 118                         $this->error('Cannot find End Of Central Directory (truncated file?)');
 119                         return false;
 120                 }
 121
 122                 // central directory couldn't be found and/or parsed
 123                 // scan through actual file data entries, recover as much as possible from probable trucated file
 124                 if ($info['zip']['compressed_size'] > ($info['filesize'] - 46 - 22)) {
 125                         $this->error('Warning: Truncated file! - Total compressed file sizes ('.$info['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($info['filesize'] - 46 - 22).' bytes)');
 126                 }
 127                 $this->error('Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete');
 128                 foreach ($info['zip']['entries'] as $key => $valuearray) {
 129                         $info['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size'];
 130                 }
 131                 return true;
 132         }
 133
 134         /**
 135          * @return bool
 136          */
 137         public function getZIPHeaderFilepointerTopDown() {
 138                 $info = &$this->getid3->info;
 139
 140                 $info['fileformat'] = 'zip';
 141
 142                 $info['zip']['compressed_size']   = 0;
 143                 $info['zip']['uncompressed_size'] = 0;
 144                 $info['zip']['entries_count']     = 0;
 145
 146                 rewind($this->getid3->fp);
 147                 while ($fileentry = $this->ZIPparseLocalFileHeader()) {
 148                         $info['zip']['entries'][] = $fileentry;
 149                         $info['zip']['entries_count']++;
 150                 }
 151                 if ($info['zip']['entries_count'] == 0) {
 152                         $this->error('No Local File Header entries found');
 153                         return false;
 154                 }
 155
 156                 $info['zip']['entries_count']     = 0;
 157                 while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) {
 158                         $info['zip']['central_directory'][] = $centraldirectoryentry;
 159                         $info['zip']['entries_count']++;
 160                         $info['zip']['compressed_size']   += $centraldirectoryentry['compressed_size'];
 161                         $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
 162                 }
 163                 if ($info['zip']['entries_count'] == 0) {
 164                         $this->error('No Central Directory entries found (truncated file?)');
 165                         return false;
 166                 }
 167
 168                 if ($EOCD = $this->ZIPparseEndOfCentralDirectory()) {
 169                         $info['zip']['end_central_directory'] = $EOCD;
 170                 } else {
 171                         $this->error('No End Of Central Directory entry found (truncated file?)');
 172                         return false;
 173                 }
 174
 175                 if (!empty($info['zip']['end_central_directory']['comment'])) {
 176                         $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment'];
 177                 }
 178
 179                 return true;
 180         }
 181
 182         /**
 183          * @return bool
 184          */
 185         public function getZIPentriesFilepointer() {
 186                 $info = &$this->getid3->info;
 187
 188                 $info['zip']['compressed_size']   = 0;
 189                 $info['zip']['uncompressed_size'] = 0;
 190                 $info['zip']['entries_count']     = 0;
 191
 192                 rewind($this->getid3->fp);
 193                 while ($fileentry = $this->ZIPparseLocalFileHeader()) {
 194                         $info['zip']['entries'][] = $fileentry;
 195                         $info['zip']['entries_count']++;
 196                         $info['zip']['compressed_size']   += $fileentry['compressed_size'];
 197                         $info['zip']['uncompressed_size'] += $fileentry['uncompressed_size'];
 198                 }
 199                 if ($info['zip']['entries_count'] == 0) {
 200                         $this->error('No Local File Header entries found');
 201                         return false;
 202                 }
 203
 204                 return true;
 205         }
 206
 207         /**
 208          * @return array|false
 209          */
 210         public function ZIPparseLocalFileHeader() {
 211                 $LocalFileHeader['offset'] = $this->ftell();
 212
 213                 $ZIPlocalFileHeader = $this->fread(30);
 214
 215                 $LocalFileHeader['raw']['signature']          = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  0, 4));
 216                 if ($LocalFileHeader['raw']['signature'] != 0x04034B50) { // "PK\x03\x04"
 217                         // invalid Local File Header Signature
 218                         $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly
 219                         return false;
 220                 }
 221                 $LocalFileHeader['raw']['extract_version']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  4, 2));
 222                 $LocalFileHeader['raw']['general_flags']      = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  6, 2));
 223                 $LocalFileHeader['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader,  8, 2));
 224                 $LocalFileHeader['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 10, 2));
 225                 $LocalFileHeader['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 12, 2));
 226                 $LocalFileHeader['raw']['crc_32']             = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 14, 4));
 227                 $LocalFileHeader['raw']['compressed_size']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 18, 4));
 228                 $LocalFileHeader['raw']['uncompressed_size']  = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 22, 4));
 229                 $LocalFileHeader['raw']['filename_length']    = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 26, 2));
 230                 $LocalFileHeader['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 28, 2));
 231
 232                 $LocalFileHeader['extract_version']           = sprintf('%1.1f', $LocalFileHeader['raw']['extract_version'] / 10);
 233                 $LocalFileHeader['host_os']                   = $this->ZIPversionOSLookup(($LocalFileHeader['raw']['extract_version'] & 0xFF00) >> 8);
 234                 $LocalFileHeader['compression_method']        = $this->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']);
 235                 $LocalFileHeader['compressed_size']           = $LocalFileHeader['raw']['compressed_size'];
 236                 $LocalFileHeader['uncompressed_size']         = $LocalFileHeader['raw']['uncompressed_size'];
 237                 $LocalFileHeader['flags']                     = $this->ZIPparseGeneralPurposeFlags($LocalFileHeader['raw']['general_flags'], $LocalFileHeader['raw']['compression_method']);
 238                 $LocalFileHeader['last_modified_timestamp']   = $this->DOStime2UNIXtime($LocalFileHeader['raw']['last_mod_file_date'], $LocalFileHeader['raw']['last_mod_file_time']);
 239
 240                 $FilenameExtrafieldLength = $LocalFileHeader['raw']['filename_length'] + $LocalFileHeader['raw']['extra_field_length'];
 241                 if ($FilenameExtrafieldLength > 0) {
 242                         $ZIPlocalFileHeader .= $this->fread($FilenameExtrafieldLength);
 243
 244                         if ($LocalFileHeader['raw']['filename_length'] > 0) {
 245                                 $LocalFileHeader['filename']                = substr($ZIPlocalFileHeader, 30, $LocalFileHeader['raw']['filename_length']);
 246                         }
 247                         if ($LocalFileHeader['raw']['extra_field_length'] > 0) {
 248                                 $LocalFileHeader['raw']['extra_field_data'] = substr($ZIPlocalFileHeader, 30 + $LocalFileHeader['raw']['filename_length'], $LocalFileHeader['raw']['extra_field_length']);
 249                         }
 250                 }
 251
 252                 if ($LocalFileHeader['compressed_size'] == 0) {
 253                         // *Could* be a zero-byte file
 254                         // But could also be a file written on the fly that didn't know compressed filesize beforehand.
 255                         // Correct compressed filesize should be in the data_descriptor located after this file data, and also in Central Directory (at end of zip file)
 256                         if (!empty($this->getid3->info['zip']['central_directory'])) {
 257                                 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) {
 258                                         if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) {
 259                                                 if ($central_directory_entry['compressed_size'] > 0) {
 260                                                         // overwrite local zero value (but not ['raw']'compressed_size']) so that seeking for data_descriptor (and next file entry) works correctly
 261                                                         $LocalFileHeader['compressed_size'] = $central_directory_entry['compressed_size'];
 262                                                 }
 263                                                 break;
 264                                         }
 265                                 }
 266                         }
 267
 268                 }
 269                 $LocalFileHeader['data_offset'] = $this->ftell();
 270                 $this->fseek($LocalFileHeader['compressed_size'], SEEK_CUR); // this should (but may not) match value in $LocalFileHeader['raw']['compressed_size'] -- $LocalFileHeader['compressed_size'] could have been overwritten above with value from Central Directory
 271
 272                 if ($LocalFileHeader['flags']['data_descriptor_used']) {
 273                         $DataDescriptor = $this->fread(16);
 274                         $LocalFileHeader['data_descriptor']['signature']         = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  0, 4));
 275                         if ($LocalFileHeader['data_descriptor']['signature'] != 0x08074B50) { // "PK\x07\x08"
 276                                 $this->getid3->warning('invalid Local File Header Data Descriptor Signature at offset '.($this->ftell() - 16).' - expecting 08 07 4B 50, found '.getid3_lib::PrintHexBytes($LocalFileHeader['data_descriptor']['signature']));
 277                                 $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly
 278                                 return false;
 279                         }
 280                         $LocalFileHeader['data_descriptor']['crc_32']            = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  4, 4));
 281                         $LocalFileHeader['data_descriptor']['compressed_size']   = getid3_lib::LittleEndian2Int(substr($DataDescriptor,  8, 4));
 282                         $LocalFileHeader['data_descriptor']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 12, 4));
 283                         if (!$LocalFileHeader['raw']['compressed_size'] && $LocalFileHeader['data_descriptor']['compressed_size']) {
 284                                 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) {
 285                                         if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) {
 286                                                 if ($LocalFileHeader['data_descriptor']['compressed_size'] == $central_directory_entry['compressed_size']) {
 287                                                         // $LocalFileHeader['compressed_size'] already set from Central Directory
 288                                                 } else {
 289                                                         $this->warning('conflicting compressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['compressed_size'].') vs Central Directory ('.$central_directory_entry['compressed_size'].') for file at offset '.$LocalFileHeader['offset']);
 290                                                 }
 291
 292                                                 if ($LocalFileHeader['data_descriptor']['uncompressed_size'] == $central_directory_entry['uncompressed_size']) {
 293                                                         $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['data_descriptor']['uncompressed_size'];
 294                                                 } else {
 295                                                         $this->warning('conflicting uncompressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['uncompressed_size'].') vs Central Directory ('.$central_directory_entry['uncompressed_size'].') for file at offset '.$LocalFileHeader['offset']);
 296                                                 }
 297                                                 break;
 298                                         }
 299                                 }
 300                         }
 301                 }
 302                 return $LocalFileHeader;
 303         }
 304
 305         /**
 306          * @return array|false
 307          */
 308         public function ZIPparseCentralDirectory() {
 309                 $CentralDirectory['offset'] = $this->ftell();
 310
 311                 $ZIPcentralDirectory = $this->fread(46);
 312
 313                 $CentralDirectory['raw']['signature']            = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  0, 4));
 314                 if ($CentralDirectory['raw']['signature'] != 0x02014B50) {
 315                         // invalid Central Directory Signature
 316                         $this->fseek($CentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly
 317                         return false;
 318                 }
 319                 $CentralDirectory['raw']['create_version']       = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  4, 2));
 320                 $CentralDirectory['raw']['extract_version']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  6, 2));
 321                 $CentralDirectory['raw']['general_flags']        = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory,  8, 2));
 322                 $CentralDirectory['raw']['compression_method']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 10, 2));
 323                 $CentralDirectory['raw']['last_mod_file_time']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 12, 2));
 324                 $CentralDirectory['raw']['last_mod_file_date']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 14, 2));
 325                 $CentralDirectory['raw']['crc_32']               = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 16, 4));
 326                 $CentralDirectory['raw']['compressed_size']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 20, 4));
 327                 $CentralDirectory['raw']['uncompressed_size']    = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 24, 4));
 328                 $CentralDirectory['raw']['filename_length']      = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 28, 2));
 329                 $CentralDirectory['raw']['extra_field_length']   = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 30, 2));
 330                 $CentralDirectory['raw']['file_comment_length']  = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 32, 2));
 331                 $CentralDirectory['raw']['disk_number_start']    = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 34, 2));
 332                 $CentralDirectory['raw']['internal_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 36, 2));
 333                 $CentralDirectory['raw']['external_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 38, 4));
 334                 $CentralDirectory['raw']['local_header_offset']  = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 42, 4));
 335
 336                 $CentralDirectory['entry_offset']              = $CentralDirectory['raw']['local_header_offset'];
 337                 $CentralDirectory['create_version']            = sprintf('%1.1f', $CentralDirectory['raw']['create_version'] / 10);
 338                 $CentralDirectory['extract_version']           = sprintf('%1.1f', $CentralDirectory['raw']['extract_version'] / 10);
 339                 $CentralDirectory['host_os']                   = $this->ZIPversionOSLookup(($CentralDirectory['raw']['extract_version'] & 0xFF00) >> 8);
 340                 $CentralDirectory['compression_method']        = $this->ZIPcompressionMethodLookup($CentralDirectory['raw']['compression_method']);
 341                 $CentralDirectory['compressed_size']           = $CentralDirectory['raw']['compressed_size'];
 342                 $CentralDirectory['uncompressed_size']         = $CentralDirectory['raw']['uncompressed_size'];
 343                 $CentralDirectory['flags']                     = $this->ZIPparseGeneralPurposeFlags($CentralDirectory['raw']['general_flags'], $CentralDirectory['raw']['compression_method']);
 344                 $CentralDirectory['last_modified_timestamp']   = $this->DOStime2UNIXtime($CentralDirectory['raw']['last_mod_file_date'], $CentralDirectory['raw']['last_mod_file_time']);
 345
 346                 $FilenameExtrafieldCommentLength = $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'] + $CentralDirectory['raw']['file_comment_length'];
 347                 if ($FilenameExtrafieldCommentLength > 0) {
 348                         $FilenameExtrafieldComment = $this->fread($FilenameExtrafieldCommentLength);
 349
 350                         if ($CentralDirectory['raw']['filename_length'] > 0) {
 351                                 $CentralDirectory['filename']                  = substr($FilenameExtrafieldComment, 0, $CentralDirectory['raw']['filename_length']);
 352                         }
 353                         if ($CentralDirectory['raw']['extra_field_length'] > 0) {
 354                                 $CentralDirectory['raw']['extra_field_data']   = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'], $CentralDirectory['raw']['extra_field_length']);
 355                         }
 356                         if ($CentralDirectory['raw']['file_comment_length'] > 0) {
 357                                 $CentralDirectory['file_comment']              = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'], $CentralDirectory['raw']['file_comment_length']);
 358                         }
 359                 }
 360
 361                 return $CentralDirectory;
 362         }
 363
 364         /**
 365          * @return array|false
 366          */
 367         public function ZIPparseEndOfCentralDirectory() {
 368                 $EndOfCentralDirectory['offset'] = $this->ftell();
 369
 370                 $ZIPendOfCentralDirectory = $this->fread(22);
 371
 372                 $EndOfCentralDirectory['signature']                   = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  0, 4));
 373                 if ($EndOfCentralDirectory['signature'] != 0x06054B50) {
 374                         // invalid End Of Central Directory Signature
 375                         $this->fseek($EndOfCentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly
 376                         return false;
 377                 }
 378                 $EndOfCentralDirectory['disk_number_current']         = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  4, 2));
 379                 $EndOfCentralDirectory['disk_number_start_directory'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  6, 2));
 380                 $EndOfCentralDirectory['directory_entries_this_disk'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory,  8, 2));
 381                 $EndOfCentralDirectory['directory_entries_total']     = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 10, 2));
 382                 $EndOfCentralDirectory['directory_size']              = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 12, 4));
 383                 $EndOfCentralDirectory['directory_offset']            = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 16, 4));
 384                 $EndOfCentralDirectory['comment_length']              = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 20, 2));
 385
 386                 if ($EndOfCentralDirectory['comment_length'] > 0) {
 387                         $EndOfCentralDirectory['comment']                 = $this->fread($EndOfCentralDirectory['comment_length']);
 388                 }
 389
 390                 return $EndOfCentralDirectory;
 391         }
 392
 393         /**
 394          * @param int $flagbytes
 395          * @param int $compressionmethod
 396          *
 397          * @return array
 398          */
 399         public static function ZIPparseGeneralPurposeFlags($flagbytes, $compressionmethod) {
 400                 // https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip-printable.html
 401                 $ParsedFlags = array();
 402                 $ParsedFlags['encrypted']               = (bool) ($flagbytes & 0x0001);
 403                 //                                                             0x0002 -- see below
 404                 //                                                             0x0004 -- see below
 405                 $ParsedFlags['data_descriptor_used']    = (bool) ($flagbytes & 0x0008);
 406                 $ParsedFlags['enhanced_deflation']      = (bool) ($flagbytes & 0x0010);
 407                 $ParsedFlags['compressed_patched_data'] = (bool) ($flagbytes & 0x0020);
 408                 $ParsedFlags['strong_encryption']       = (bool) ($flagbytes & 0x0040);
 409                 //                                                             0x0080 - unused
 410                 //                                                             0x0100 - unused
 411                 //                                                             0x0200 - unused
 412                 //                                                             0x0400 - unused
 413                 $ParsedFlags['language_encoding']       = (bool) ($flagbytes & 0x0800);
 414                 //                                                             0x1000 - reserved
 415                 $ParsedFlags['mask_header_values']      = (bool) ($flagbytes & 0x2000);
 416                 //                                                             0x4000 - reserved
 417                 //                                                             0x8000 - reserved
 418
 419                 switch ($compressionmethod) {
 420                         case 6:
 421                                 $ParsedFlags['dictionary_size']    = (($flagbytes & 0x0002) ? 8192 : 4096);
 422                                 $ParsedFlags['shannon_fano_trees'] = (($flagbytes & 0x0004) ? 3    : 2);
 423                                 break;
 424
 425                         case 8:
 426                         case 9:
 427                                 switch (($flagbytes & 0x0006) >> 1) {
 428                                         case 0:
 429                                                 $ParsedFlags['compression_speed'] = 'normal';
 430                                                 break;
 431                                         case 1:
 432                                                 $ParsedFlags['compression_speed'] = 'maximum';
 433                                                 break;
 434                                         case 2:
 435                                                 $ParsedFlags['compression_speed'] = 'fast';
 436                                                 break;
 437                                         case 3:
 438                                                 $ParsedFlags['compression_speed'] = 'superfast';
 439                                                 break;
 440                                 }
 441                                 break;
 442                 }
 443
 444                 return $ParsedFlags;
 445         }
 446
 447         /**
 448          * @param int $index
 449          *
 450          * @return string
 451          */
 452         public static function ZIPversionOSLookup($index) {
 453                 static $ZIPversionOSLookup = array(
 454                         0  => 'MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems)',
 455                         1  => 'Amiga',
 456                         2  => 'OpenVMS',
 457                         3  => 'Unix',
 458                         4  => 'VM/CMS',
 459                         5  => 'Atari ST',
 460                         6  => 'OS/2 H.P.F.S.',
 461                         7  => 'Macintosh',
 462                         8  => 'Z-System',
 463                         9  => 'CP/M',
 464                         10 => 'Windows NTFS',
 465                         11 => 'MVS',
 466                         12 => 'VSE',
 467                         13 => 'Acorn Risc',
 468                         14 => 'VFAT',
 469                         15 => 'Alternate MVS',
 470                         16 => 'BeOS',
 471                         17 => 'Tandem',
 472                         18 => 'OS/400',
 473                         19 => 'OS/X (Darwin)',
 474                 );
 475
 476                 return (isset($ZIPversionOSLookup[$index]) ? $ZIPversionOSLookup[$index] : '[unknown]');
 477         }
 478
 479         /**
 480          * @param int $index
 481          *
 482          * @return string
 483          */
 484         public static function ZIPcompressionMethodLookup($index) {
 485                 // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/ZIP.html
 486                 static $ZIPcompressionMethodLookup = array(
 487                         0  => 'store',
 488                         1  => 'shrink',
 489                         2  => 'reduce-1',
 490                         3  => 'reduce-2',
 491                         4  => 'reduce-3',
 492                         5  => 'reduce-4',
 493                         6  => 'implode',
 494                         7  => 'tokenize',
 495                         8  => 'deflate',
 496                         9  => 'deflate64',
 497                         10 => 'Imploded (old IBM TERSE)',
 498                         11 => 'RESERVED[11]',
 499                         12 => 'BZIP2',
 500                         13 => 'RESERVED[13]',
 501                         14 => 'LZMA (EFS)',
 502                         15 => 'RESERVED[15]',
 503                         16 => 'RESERVED[16]',
 504                         17 => 'RESERVED[17]',
 505                         18 => 'IBM TERSE (new)',
 506                         19 => 'IBM LZ77 z Architecture (PFS)',
 507                         96 => 'JPEG recompressed',
 508                         97 => 'WavPack compressed',
 509                         98 => 'PPMd version I, Rev 1',
 510                 );
 511
 512                 return (isset($ZIPcompressionMethodLookup[$index]) ? $ZIPcompressionMethodLookup[$index] : '[unknown]');
 513         }
 514
 515         /**
 516          * @param int $DOSdate
 517          * @param int $DOStime
 518          *
 519          * @return int
 520          */
 521         public static function DOStime2UNIXtime($DOSdate, $DOStime) {
 522                 // wFatDate
 523                 // Specifies the MS-DOS date. The date is a packed 16-bit value with the following format:
 524                 // Bits      Contents
 525                 // 0-4    Day of the month (1-31)
 526                 // 5-8    Month (1 = January, 2 = February, and so on)
 527                 // 9-15   Year offset from 1980 (add 1980 to get actual year)
 528
 529                 $UNIXday    =  ($DOSdate & 0x001F);
 530                 $UNIXmonth  = (($DOSdate & 0x01E0) >> 5);
 531                 $UNIXyear   = (($DOSdate & 0xFE00) >> 9) + 1980;
 532
 533                 // wFatTime
 534                 // Specifies the MS-DOS time. The time is a packed 16-bit value with the following format:
 535                 // Bits   Contents
 536                 // 0-4    Second divided by 2
 537                 // 5-10   Minute (0-59)
 538                 // 11-15  Hour (0-23 on a 24-hour clock)
 539
 540                 $UNIXsecond =  ($DOStime & 0x001F) * 2;
 541                 $UNIXminute = (($DOStime & 0x07E0) >> 5);
 542                 $UNIXhour   = (($DOStime & 0xF800) >> 11);
 543
 544                 return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
 545         }
 546
 547 }