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 17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers 18 exit; 19} 20 21class getid3_zip extends getid3_handler 22{ 23 /** 24 * @return bool 25 */ 26 public function Analyze() { 27 $info = &$this->getid3->info; 28 29 $info['fileformat'] = 'zip'; 30 $info['zip']['encoding'] = 'ISO-8859-1'; 31 $info['zip']['files'] = array(); 32 33 $info['zip']['compressed_size'] = 0; 34 $info['zip']['uncompressed_size'] = 0; 35 $info['zip']['entries_count'] = 0; 36 37 if (!getid3_lib::intValueSupported($info['filesize'])) { 38 $this->error('File is larger than '.round(PHP_INT_MAX / 1073741824).'GB, not supported by PHP'); 39 return false; 40 } else { 41 $EOCDsearchData = ''; 42 $EOCDsearchCounter = 0; 43 while ($EOCDsearchCounter++ < 512) { 44 45 $this->fseek(-128 * $EOCDsearchCounter, SEEK_END); 46 $EOCDsearchData = $this->fread(128).$EOCDsearchData; 47 48 if (strstr($EOCDsearchData, 'PK'."\x05\x06")) { 49 50 $EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06"); 51 $this->fseek((-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END); 52 $info['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory(); 53 54 $this->fseek($info['zip']['end_central_directory']['directory_offset']); 55 $info['zip']['entries_count'] = 0; 56 while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) { 57 $info['zip']['central_directory'][] = $centraldirectoryentry; 58 $info['zip']['entries_count']++; 59 $info['zip']['compressed_size'] += $centraldirectoryentry['compressed_size']; 60 $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size']; 61 62 //if ($centraldirectoryentry['uncompressed_size'] > 0) { zero-byte files are valid 63 if (!empty($centraldirectoryentry['filename'])) { 64 $info['zip']['files'] = getid3_lib::array_merge_clobber($info['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size'])); 65 } 66 } 67 68 if ($info['zip']['entries_count'] == 0) { 69 $this->error('No Central Directory entries found (truncated file?)'); 70 return false; 71 } 72 73 if (!empty($info['zip']['end_central_directory']['comment'])) { 74 $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment']; 75 } 76 77 if (isset($info['zip']['central_directory'][0]['compression_method'])) { 78 $info['zip']['compression_method'] = $info['zip']['central_directory'][0]['compression_method']; 79 } 80 if (isset($info['zip']['central_directory'][0]['flags']['compression_speed'])) { 81 $info['zip']['compression_speed'] = $info['zip']['central_directory'][0]['flags']['compression_speed']; 82 } 83 if (isset($info['zip']['compression_method']) && ($info['zip']['compression_method'] == 'store') && !isset($info['zip']['compression_speed'])) { 84 $info['zip']['compression_speed'] = 'store'; 85 } 86 87 // secondary check - we (should) already have all the info we NEED from the Central Directory above, but scanning each 88 // Local File Header entry will 89 foreach ($info['zip']['central_directory'] as $central_directory_entry) { 90 $this->fseek($central_directory_entry['entry_offset']); 91 if ($fileentry = $this->ZIPparseLocalFileHeader()) { 92 $info['zip']['entries'][] = $fileentry; 93 } else { 94 $this->warning('Error parsing Local File Header at offset '.$central_directory_entry['entry_offset']); 95 } 96 } 97 98 // check for EPUB files 99 if (!empty($info['zip']['entries'][0]['filename']) && 100 ($info['zip']['entries'][0]['filename'] == 'mimetype') && 101 ($info['zip']['entries'][0]['compression_method'] == 'store') && 102 ($info['zip']['entries'][0]['uncompressed_size'] == 20) && 103 isset($info['zip']['entries'][0]['data_offset'])) { 104 // http://idpf.org/epub/30/spec/epub30-ocf.html 105 // "3.3 OCF ZIP Container Media Type Identification 106 // OCF ZIP Containers must include a mimetype file as the first file in the Container, and the contents of this file must be the MIME type string application/epub+zip. 107 // The contents of the mimetype file must not contain any leading padding or whitespace, must not begin with the Unicode signature (or Byte Order Mark), 108 // and the case of the MIME type string must be exactly as presented above. The mimetype file additionally must be neither compressed nor encrypted, 109 // and there must not be an extra field in its ZIP header." 110 $this->fseek($info['zip']['entries'][0]['data_offset']); 111 if ($this->fread(20) == 'application/epub+zip') { 112 $info['fileformat'] = 'zip.epub'; 113 $info['mime_type'] = 'application/epub+zip'; 114 } 115 } 116 117 // check for Office Open XML files (e.g. .docx, .xlsx) 118 if (!empty($info['zip']['files']['[Content_Types].xml']) && 119 !empty($info['zip']['files']['_rels']['.rels']) && 120 !empty($info['zip']['files']['docProps']['app.xml']) && 121 !empty($info['zip']['files']['docProps']['core.xml'])) { 122 // http://technet.microsoft.com/en-us/library/cc179224.aspx 123 $info['fileformat'] = 'zip.msoffice'; 124 if (!empty($ThisFileInfo['zip']['files']['ppt'])) { 125 $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation'; 126 } elseif (!empty($ThisFileInfo['zip']['files']['xl'])) { 127 $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'; 128 } elseif (!empty($ThisFileInfo['zip']['files']['word'])) { 129 $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'; 130 } 131 } 132 133 return true; 134 } 135 } 136 } 137 138 if (!$this->getZIPentriesFilepointer()) { 139 unset($info['zip']); 140 $info['fileformat'] = ''; 141 $this->error('Cannot find End Of Central Directory (truncated file?)'); 142 return false; 143 } 144 145 // central directory couldn't be found and/or parsed 146 // scan through actual file data entries, recover as much as possible from probable trucated file 147 if ($info['zip']['compressed_size'] > ($info['filesize'] - 46 - 22)) { 148 $this->error('Warning: Truncated file! - Total compressed file sizes ('.$info['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($info['filesize'] - 46 - 22).' bytes)'); 149 } 150 $this->error('Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete'); 151 foreach ($info['zip']['entries'] as $key => $valuearray) { 152 $info['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size']; 153 } 154 return true; 155 } 156 157 /** 158 * @return bool 159 */ 160 public function getZIPHeaderFilepointerTopDown() { 161 $info = &$this->getid3->info; 162 163 $info['fileformat'] = 'zip'; 164 165 $info['zip']['compressed_size'] = 0; 166 $info['zip']['uncompressed_size'] = 0; 167 $info['zip']['entries_count'] = 0; 168 169 rewind($this->getid3->fp); 170 while ($fileentry = $this->ZIPparseLocalFileHeader()) { 171 $info['zip']['entries'][] = $fileentry; 172 $info['zip']['entries_count']++; 173 } 174 if ($info['zip']['entries_count'] == 0) { 175 $this->error('No Local File Header entries found'); 176 return false; 177 } 178 179 $info['zip']['entries_count'] = 0; 180 while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) { 181 $info['zip']['central_directory'][] = $centraldirectoryentry; 182 $info['zip']['entries_count']++; 183 $info['zip']['compressed_size'] += $centraldirectoryentry['compressed_size']; 184 $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size']; 185 } 186 if ($info['zip']['entries_count'] == 0) { 187 $this->error('No Central Directory entries found (truncated file?)'); 188 return false; 189 } 190 191 if ($EOCD = $this->ZIPparseEndOfCentralDirectory()) { 192 $info['zip']['end_central_directory'] = $EOCD; 193 } else { 194 $this->error('No End Of Central Directory entry found (truncated file?)'); 195 return false; 196 } 197 198 if (!empty($info['zip']['end_central_directory']['comment'])) { 199 $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment']; 200 } 201 202 return true; 203 } 204 205 /** 206 * @return bool 207 */ 208 public function getZIPentriesFilepointer() { 209 $info = &$this->getid3->info; 210 211 $info['zip']['compressed_size'] = 0; 212 $info['zip']['uncompressed_size'] = 0; 213 $info['zip']['entries_count'] = 0; 214 215 rewind($this->getid3->fp); 216 while ($fileentry = $this->ZIPparseLocalFileHeader()) { 217 $info['zip']['entries'][] = $fileentry; 218 $info['zip']['entries_count']++; 219 $info['zip']['compressed_size'] += $fileentry['compressed_size']; 220 $info['zip']['uncompressed_size'] += $fileentry['uncompressed_size']; 221 } 222 if ($info['zip']['entries_count'] == 0) { 223 $this->error('No Local File Header entries found'); 224 return false; 225 } 226 227 return true; 228 } 229 230 /** 231 * @return array|false 232 */ 233 public function ZIPparseLocalFileHeader() { 234 $LocalFileHeader['offset'] = $this->ftell(); 235 236 $ZIPlocalFileHeader = $this->fread(30); 237 238 $LocalFileHeader['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 0, 4)); 239 if ($LocalFileHeader['raw']['signature'] != 0x04034B50) { // "PK\x03\x04" 240 // invalid Local File Header Signature 241 $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly 242 return false; 243 } 244 $LocalFileHeader['raw']['extract_version'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 4, 2)); 245 $LocalFileHeader['raw']['general_flags'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 6, 2)); 246 $LocalFileHeader['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 8, 2)); 247 $LocalFileHeader['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 10, 2)); 248 $LocalFileHeader['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 12, 2)); 249 $LocalFileHeader['raw']['crc_32'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 14, 4)); 250 $LocalFileHeader['raw']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 18, 4)); 251 $LocalFileHeader['raw']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 22, 4)); 252 $LocalFileHeader['raw']['filename_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 26, 2)); 253 $LocalFileHeader['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 28, 2)); 254 255 $LocalFileHeader['extract_version'] = sprintf('%1.1f', $LocalFileHeader['raw']['extract_version'] / 10); 256 $LocalFileHeader['host_os'] = $this->ZIPversionOSLookup(($LocalFileHeader['raw']['extract_version'] & 0xFF00) >> 8); 257 $LocalFileHeader['compression_method'] = $this->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']); 258 $LocalFileHeader['compressed_size'] = $LocalFileHeader['raw']['compressed_size']; 259 $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['raw']['uncompressed_size']; 260 $LocalFileHeader['flags'] = $this->ZIPparseGeneralPurposeFlags($LocalFileHeader['raw']['general_flags'], $LocalFileHeader['raw']['compression_method']); 261 $LocalFileHeader['last_modified_timestamp'] = $this->DOStime2UNIXtime($LocalFileHeader['raw']['last_mod_file_date'], $LocalFileHeader['raw']['last_mod_file_time']); 262 263 $FilenameExtrafieldLength = $LocalFileHeader['raw']['filename_length'] + $LocalFileHeader['raw']['extra_field_length']; 264 if ($FilenameExtrafieldLength > 0) { 265 $ZIPlocalFileHeader .= $this->fread($FilenameExtrafieldLength); 266 267 if ($LocalFileHeader['raw']['filename_length'] > 0) { 268 $LocalFileHeader['filename'] = substr($ZIPlocalFileHeader, 30, $LocalFileHeader['raw']['filename_length']); 269 } 270 if ($LocalFileHeader['raw']['extra_field_length'] > 0) { 271 $LocalFileHeader['raw']['extra_field_data'] = substr($ZIPlocalFileHeader, 30 + $LocalFileHeader['raw']['filename_length'], $LocalFileHeader['raw']['extra_field_length']); 272 } 273 } 274 275 if ($LocalFileHeader['compressed_size'] == 0) { 276 // *Could* be a zero-byte file 277 // But could also be a file written on the fly that didn't know compressed filesize beforehand. 278 // Correct compressed filesize should be in the data_descriptor located after this file data, and also in Central Directory (at end of zip file) 279 if (!empty($this->getid3->info['zip']['central_directory'])) { 280 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) { 281 if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) { 282 if ($central_directory_entry['compressed_size'] > 0) { 283 // overwrite local zero value (but not ['raw']'compressed_size']) so that seeking for data_descriptor (and next file entry) works correctly 284 $LocalFileHeader['compressed_size'] = $central_directory_entry['compressed_size']; 285 } 286 break; 287 } 288 } 289 } 290 291 } 292 $LocalFileHeader['data_offset'] = $this->ftell(); 293 $this->fseek($LocalFileHeader['compressed_size'], SEEK_CUR); // this should (but may not) match value in $LocalFileHeader['raw']['compressed_size'] -- $LocalFileHeader['compressed_size'] could have been overwritten above with value from Central Directory 294 295 if ($LocalFileHeader['flags']['data_descriptor_used']) { 296 $DataDescriptor = $this->fread(16); 297 $LocalFileHeader['data_descriptor']['signature'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 0, 4)); 298 if ($LocalFileHeader['data_descriptor']['signature'] != 0x08074B50) { // "PK\x07\x08" 299 $this->getid3->warning('invalid Local File Header Data Descriptor Signature at offset '.($this->ftell() - 16).' - expecting 08 07 4B 50, found '.getid3_lib::PrintHexBytes($LocalFileHeader['data_descriptor']['signature'])); 300 $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly 301 return false; 302 } 303 $LocalFileHeader['data_descriptor']['crc_32'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 4, 4)); 304 $LocalFileHeader['data_descriptor']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 8, 4)); 305 $LocalFileHeader['data_descriptor']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 12, 4)); 306 if (!$LocalFileHeader['raw']['compressed_size'] && $LocalFileHeader['data_descriptor']['compressed_size']) { 307 foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) { 308 if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) { 309 if ($LocalFileHeader['data_descriptor']['compressed_size'] == $central_directory_entry['compressed_size']) { 310 // $LocalFileHeader['compressed_size'] already set from Central Directory 311 } else { 312 $this->warning('conflicting compressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['compressed_size'].') vs Central Directory ('.$central_directory_entry['compressed_size'].') for file at offset '.$LocalFileHeader['offset']); 313 } 314 315 if ($LocalFileHeader['data_descriptor']['uncompressed_size'] == $central_directory_entry['uncompressed_size']) { 316 $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['data_descriptor']['uncompressed_size']; 317 } else { 318 $this->warning('conflicting uncompressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['uncompressed_size'].') vs Central Directory ('.$central_directory_entry['uncompressed_size'].') for file at offset '.$LocalFileHeader['offset']); 319 } 320 break; 321 } 322 } 323 } 324 } 325 return $LocalFileHeader; 326 } 327 328 /** 329 * @return array|false 330 */ 331 public function ZIPparseCentralDirectory() { 332 $CentralDirectory['offset'] = $this->ftell(); 333 334 $ZIPcentralDirectory = $this->fread(46); 335 336 $CentralDirectory['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 0, 4)); 337 if ($CentralDirectory['raw']['signature'] != 0x02014B50) { 338 // invalid Central Directory Signature 339 $this->fseek($CentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly 340 return false; 341 } 342 $CentralDirectory['raw']['create_version'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 4, 2)); 343 $CentralDirectory['raw']['extract_version'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 6, 2)); 344 $CentralDirectory['raw']['general_flags'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 8, 2)); 345 $CentralDirectory['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 10, 2)); 346 $CentralDirectory['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 12, 2)); 347 $CentralDirectory['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 14, 2)); 348 $CentralDirectory['raw']['crc_32'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 16, 4)); 349 $CentralDirectory['raw']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 20, 4)); 350 $CentralDirectory['raw']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 24, 4)); 351 $CentralDirectory['raw']['filename_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 28, 2)); 352 $CentralDirectory['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 30, 2)); 353 $CentralDirectory['raw']['file_comment_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 32, 2)); 354 $CentralDirectory['raw']['disk_number_start'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 34, 2)); 355 $CentralDirectory['raw']['internal_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 36, 2)); 356 $CentralDirectory['raw']['external_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 38, 4)); 357 $CentralDirectory['raw']['local_header_offset'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 42, 4)); 358 359 $CentralDirectory['entry_offset'] = $CentralDirectory['raw']['local_header_offset']; 360 $CentralDirectory['create_version'] = sprintf('%1.1f', $CentralDirectory['raw']['create_version'] / 10); 361 $CentralDirectory['extract_version'] = sprintf('%1.1f', $CentralDirectory['raw']['extract_version'] / 10); 362 $CentralDirectory['host_os'] = $this->ZIPversionOSLookup(($CentralDirectory['raw']['extract_version'] & 0xFF00) >> 8); 363 $CentralDirectory['compression_method'] = $this->ZIPcompressionMethodLookup($CentralDirectory['raw']['compression_method']); 364 $CentralDirectory['compressed_size'] = $CentralDirectory['raw']['compressed_size']; 365 $CentralDirectory['uncompressed_size'] = $CentralDirectory['raw']['uncompressed_size']; 366 $CentralDirectory['flags'] = $this->ZIPparseGeneralPurposeFlags($CentralDirectory['raw']['general_flags'], $CentralDirectory['raw']['compression_method']); 367 $CentralDirectory['last_modified_timestamp'] = $this->DOStime2UNIXtime($CentralDirectory['raw']['last_mod_file_date'], $CentralDirectory['raw']['last_mod_file_time']); 368 369 $FilenameExtrafieldCommentLength = $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'] + $CentralDirectory['raw']['file_comment_length']; 370 if ($FilenameExtrafieldCommentLength > 0) { 371 $FilenameExtrafieldComment = $this->fread($FilenameExtrafieldCommentLength); 372 373 if ($CentralDirectory['raw']['filename_length'] > 0) { 374 $CentralDirectory['filename'] = substr($FilenameExtrafieldComment, 0, $CentralDirectory['raw']['filename_length']); 375 } 376 if ($CentralDirectory['raw']['extra_field_length'] > 0) { 377 $CentralDirectory['raw']['extra_field_data'] = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'], $CentralDirectory['raw']['extra_field_length']); 378 } 379 if ($CentralDirectory['raw']['file_comment_length'] > 0) { 380 $CentralDirectory['file_comment'] = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'], $CentralDirectory['raw']['file_comment_length']); 381 } 382 } 383 384 return $CentralDirectory; 385 } 386 387 /** 388 * @return array|false 389 */ 390 public function ZIPparseEndOfCentralDirectory() { 391 $EndOfCentralDirectory['offset'] = $this->ftell(); 392 393 $ZIPendOfCentralDirectory = $this->fread(22); 394 395 $EndOfCentralDirectory['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 0, 4)); 396 if ($EndOfCentralDirectory['signature'] != 0x06054B50) { 397 // invalid End Of Central Directory Signature 398 $this->fseek($EndOfCentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly 399 return false; 400 } 401 $EndOfCentralDirectory['disk_number_current'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 4, 2)); 402 $EndOfCentralDirectory['disk_number_start_directory'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 6, 2)); 403 $EndOfCentralDirectory['directory_entries_this_disk'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 8, 2)); 404 $EndOfCentralDirectory['directory_entries_total'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 10, 2)); 405 $EndOfCentralDirectory['directory_size'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 12, 4)); 406 $EndOfCentralDirectory['directory_offset'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 16, 4)); 407 $EndOfCentralDirectory['comment_length'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 20, 2)); 408 409 if ($EndOfCentralDirectory['comment_length'] > 0) { 410 $EndOfCentralDirectory['comment'] = $this->fread($EndOfCentralDirectory['comment_length']); 411 } 412 413 return $EndOfCentralDirectory; 414 } 415 416 /** 417 * @param int $flagbytes 418 * @param int $compressionmethod 419 * 420 * @return array 421 */ 422 public static function ZIPparseGeneralPurposeFlags($flagbytes, $compressionmethod) { 423 // https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip-printable.html 424 $ParsedFlags = array(); 425 $ParsedFlags['encrypted'] = (bool) ($flagbytes & 0x0001); 426 // 0x0002 -- see below 427 // 0x0004 -- see below 428 $ParsedFlags['data_descriptor_used'] = (bool) ($flagbytes & 0x0008); 429 $ParsedFlags['enhanced_deflation'] = (bool) ($flagbytes & 0x0010); 430 $ParsedFlags['compressed_patched_data'] = (bool) ($flagbytes & 0x0020); 431 $ParsedFlags['strong_encryption'] = (bool) ($flagbytes & 0x0040); 432 // 0x0080 - unused 433 // 0x0100 - unused 434 // 0x0200 - unused 435 // 0x0400 - unused 436 $ParsedFlags['language_encoding'] = (bool) ($flagbytes & 0x0800); 437 // 0x1000 - reserved 438 $ParsedFlags['mask_header_values'] = (bool) ($flagbytes & 0x2000); 439 // 0x4000 - reserved 440 // 0x8000 - reserved 441 442 switch ($compressionmethod) { 443 case 6: 444 $ParsedFlags['dictionary_size'] = (($flagbytes & 0x0002) ? 8192 : 4096); 445 $ParsedFlags['shannon_fano_trees'] = (($flagbytes & 0x0004) ? 3 : 2); 446 break; 447 448 case 8: 449 case 9: 450 switch (($flagbytes & 0x0006) >> 1) { 451 case 0: 452 $ParsedFlags['compression_speed'] = 'normal'; 453 break; 454 case 1: 455 $ParsedFlags['compression_speed'] = 'maximum'; 456 break; 457 case 2: 458 $ParsedFlags['compression_speed'] = 'fast'; 459 break; 460 case 3: 461 $ParsedFlags['compression_speed'] = 'superfast'; 462 break; 463 } 464 break; 465 } 466 467 return $ParsedFlags; 468 } 469 470 /** 471 * @param int $index 472 * 473 * @return string 474 */ 475 public static function ZIPversionOSLookup($index) { 476 static $ZIPversionOSLookup = array( 477 0 => 'MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems)', 478 1 => 'Amiga', 479 2 => 'OpenVMS', 480 3 => 'Unix', 481 4 => 'VM/CMS', 482 5 => 'Atari ST', 483 6 => 'OS/2 H.P.F.S.', 484 7 => 'Macintosh', 485 8 => 'Z-System', 486 9 => 'CP/M', 487 10 => 'Windows NTFS', 488 11 => 'MVS', 489 12 => 'VSE', 490 13 => 'Acorn Risc', 491 14 => 'VFAT', 492 15 => 'Alternate MVS', 493 16 => 'BeOS', 494 17 => 'Tandem', 495 18 => 'OS/400', 496 19 => 'OS/X (Darwin)', 497 ); 498 499 return (isset($ZIPversionOSLookup[$index]) ? $ZIPversionOSLookup[$index] : '[unknown]'); 500 } 501 502 /** 503 * @param int $index 504 * 505 * @return string 506 */ 507 public static function ZIPcompressionMethodLookup($index) { 508 // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/ZIP.html 509 static $ZIPcompressionMethodLookup = array( 510 0 => 'store', 511 1 => 'shrink', 512 2 => 'reduce-1', 513 3 => 'reduce-2', 514 4 => 'reduce-3', 515 5 => 'reduce-4', 516 6 => 'implode', 517 7 => 'tokenize', 518 8 => 'deflate', 519 9 => 'deflate64', 520 10 => 'Imploded (old IBM TERSE)', 521 11 => 'RESERVED[11]', 522 12 => 'BZIP2', 523 13 => 'RESERVED[13]', 524 14 => 'LZMA (EFS)', 525 15 => 'RESERVED[15]', 526 16 => 'RESERVED[16]', 527 17 => 'RESERVED[17]', 528 18 => 'IBM TERSE (new)', 529 19 => 'IBM LZ77 z Architecture (PFS)', 530 96 => 'JPEG recompressed', 531 97 => 'WavPack compressed', 532 98 => 'PPMd version I, Rev 1', 533 ); 534 535 return (isset($ZIPcompressionMethodLookup[$index]) ? $ZIPcompressionMethodLookup[$index] : '[unknown]'); 536 } 537 538 /** 539 * @param int $DOSdate 540 * @param int $DOStime 541 * 542 * @return int 543 */ 544 public static function DOStime2UNIXtime($DOSdate, $DOStime) { 545 // wFatDate 546 // Specifies the MS-DOS date. The date is a packed 16-bit value with the following format: 547 // Bits Contents 548 // 0-4 Day of the month (1-31) 549 // 5-8 Month (1 = January, 2 = February, and so on) 550 // 9-15 Year offset from 1980 (add 1980 to get actual year) 551 552 $UNIXday = ($DOSdate & 0x001F); 553 $UNIXmonth = (($DOSdate & 0x01E0) >> 5); 554 $UNIXyear = (($DOSdate & 0xFE00) >> 9) + 1980; 555 556 // wFatTime 557 // Specifies the MS-DOS time. The time is a packed 16-bit value with the following format: 558 // Bits Contents 559 // 0-4 Second divided by 2 560 // 5-10 Minute (0-59) 561 // 11-15 Hour (0-23 on a 24-hour clock) 562 563 $UNIXsecond = ($DOStime & 0x001F) * 2; 564 $UNIXminute = (($DOStime & 0x07E0) >> 5); 565 $UNIXhour = (($DOStime & 0xF800) >> 11); 566 567 return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear); 568 } 569 570} 571