name : module.archive.gzip.php <?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.archive.gzip.php // // module for analyzing GZIP files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// // // // Module originally written by // // Mike Mozolin <teddybearØmail*ru> // // // ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } class getid3_gzip extends getid3_handler { /** * Optional file list - disable for speed. * Decode gzipped files, if possible, and parse recursively (.tar.gz for example). * * @var bool */ public $parse_contents = false; /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; $info['fileformat'] = 'gzip'; $start_length = 10; $unpack_header = 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os'; //+---+---+---+---+---+---+---+---+---+---+ //|ID1|ID2|CM |FLG| MTIME |XFL|OS | //+---+---+---+---+---+---+---+---+---+---+ if ($info['php_memory_limit'] && ($info['filesize'] > $info['php_memory_limit'])) { $this->error('File is too large ('.number_format($info['filesize']).' bytes) to read into memory (limit: '.number_format($info['php_memory_limit'] / 1048576).'MB)'); return false; } $this->fseek(0); $buffer = $this->fread($info['filesize']); $arr_members = explode("\x1F\x8B\x08", $buffer); $num_members = 0; while (true) { $is_wrong_members = false; $num_members = count($arr_members); for ($i = 0; $i < $num_members; $i++) { if (strlen($arr_members[$i]) == 0) { continue; } $buf = "\x1F\x8B\x08".$arr_members[$i]; $attr = unpack($unpack_header, substr($buf, 0, $start_length)); if (!$this->get_os_type(ord($attr['os']))) { // Merge member with previous if wrong OS type $arr_members[($i - 1)] .= $buf; $arr_members[$i] = ''; $is_wrong_members = true; continue; } } if (!$is_wrong_members) { break; } } $info['gzip']['files'] = array(); $fpointer = 0; $idx = 0; foreach ($arr_members as $member) { if (strlen($member) == 0) { continue; } $thisInfo = &$info['gzip']['member_header'][++$idx]; $buff = "\x1F\x8B\x08". $member; $attr = unpack($unpack_header, substr($buff, 0, $start_length)); $thisInfo['filemtime'] = getid3_lib::LittleEndian2Int($attr['mtime']); $thisInfo['raw']['id1'] = ord($attr['cmethod']); $thisInfo['raw']['id2'] = ord($attr['cmethod']); $thisInfo['raw']['cmethod'] = ord($attr['cmethod']); $thisInfo['raw']['os'] = ord($attr['os']); $thisInfo['raw']['xflags'] = ord($attr['xflags']); $thisInfo['raw']['flags'] = ord($attr['flags']); $thisInfo['flags']['crc16'] = (bool) ($thisInfo['raw']['flags'] & 0x02); $thisInfo['flags']['extra'] = (bool) ($thisInfo['raw']['flags'] & 0x04); $thisInfo['flags']['filename'] = (bool) ($thisInfo['raw']['flags'] & 0x08); $thisInfo['flags']['comment'] = (bool) ($thisInfo['raw']['flags'] & 0x10); $thisInfo['compression'] = $this->get_xflag_type($thisInfo['raw']['xflags']); $thisInfo['os'] = $this->get_os_type($thisInfo['raw']['os']); if (!$thisInfo['os']) { $this->error('Read error on gzip file'); return false; } $fpointer = 10; $arr_xsubfield = array(); // bit 2 - FLG.FEXTRA //+---+---+=================================+ //| XLEN |...XLEN bytes of "extra field"...| //+---+---+=================================+ if ($thisInfo['flags']['extra']) { $w_xlen = substr($buff, $fpointer, 2); $xlen = getid3_lib::LittleEndian2Int($w_xlen); $fpointer += 2; $thisInfo['raw']['xfield'] = substr($buff, $fpointer, $xlen); // Extra SubFields //+---+---+---+---+==================================+ //|SI1|SI2| LEN |... LEN bytes of subfield data ...| //+---+---+---+---+==================================+ $idx = 0; while (true) { if ($idx >= $xlen) { break; } $si1 = ord(substr($buff, $fpointer + $idx++, 1)); $si2 = ord(substr($buff, $fpointer + $idx++, 1)); if (($si1 == 0x41) && ($si2 == 0x70)) { $w_xsublen = substr($buff, $fpointer + $idx, 2); $xsublen = getid3_lib::LittleEndian2Int($w_xsublen); $idx += 2; $arr_xsubfield[] = substr($buff, $fpointer + $idx, $xsublen); $idx += $xsublen; } else { break; } } $fpointer += $xlen; } // bit 3 - FLG.FNAME //+=========================================+ //|...original file name, zero-terminated...| //+=========================================+ // GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz $thisInfo['filename'] = preg_replace('#\\.gz$#i', '', $info['filename']); if ($thisInfo['flags']['filename']) { $thisInfo['filename'] = ''; while (true) { if (ord($buff[$fpointer]) == 0) { $fpointer++; break; } $thisInfo['filename'] .= $buff[$fpointer]; $fpointer++; } } // bit 4 - FLG.FCOMMENT //+===================================+ //|...file comment, zero-terminated...| //+===================================+ if ($thisInfo['flags']['comment']) { while (true) { if (ord($buff[$fpointer]) == 0) { $fpointer++; break; } $thisInfo['comment'] .= $buff[$fpointer]; $fpointer++; } } // bit 1 - FLG.FHCRC //+---+---+ //| CRC16 | //+---+---+ if ($thisInfo['flags']['crc16']) { $w_crc = substr($buff, $fpointer, 2); $thisInfo['crc16'] = getid3_lib::LittleEndian2Int($w_crc); $fpointer += 2; } // bit 0 - FLG.FTEXT //if ($thisInfo['raw']['flags'] & 0x01) { // Ignored... //} // bits 5, 6, 7 - reserved $thisInfo['crc32'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 8, 4)); $thisInfo['filesize'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 4)); $info['gzip']['files'] = getid3_lib::array_merge_clobber($info['gzip']['files'], getid3_lib::CreateDeepArray($thisInfo['filename'], '/', $thisInfo['filesize'])); if ($this->parse_contents) { // Try to inflate GZip $csize = 0; $inflated = ''; $chkcrc32 = ''; if (function_exists('gzinflate')) { $cdata = substr($buff, $fpointer); $cdata = substr($cdata, 0, strlen($cdata) - 8); $csize = strlen($cdata); $inflated = gzinflate($cdata); // Calculate CRC32 for inflated content $thisInfo['crc32_valid'] = sprintf('%u', crc32($inflated)) == $thisInfo['crc32']; // determine format $formattest = substr($inflated, 0, 32774); $getid3_temp = new getID3(); $determined_format = $getid3_temp->GetFileFormat($formattest); unset($getid3_temp); // file format is determined $determined_format['module'] = (isset($determined_format['module']) ? $determined_format['module'] : ''); switch ($determined_format['module']) { case 'tar': // view TAR-file info if (file_exists(GETID3_INCLUDEPATH.$determined_format['include']) && include_once(GETID3_INCLUDEPATH.$determined_format['include'])) { if (($temp_tar_filename = tempnam(GETID3_TEMP_DIR, 'getID3')) === false) { // can't find anywhere to create a temp file, abort $this->error('Unable to create temp file to parse TAR inside GZIP file'); break; } if ($fp_temp_tar = fopen($temp_tar_filename, 'w+b')) { fwrite($fp_temp_tar, $inflated); fclose($fp_temp_tar); $getid3_temp = new getID3(); $getid3_temp->openfile($temp_tar_filename); $getid3_tar = new getid3_tar($getid3_temp); $getid3_tar->Analyze(); $info['gzip']['member_header'][$idx]['tar'] = $getid3_temp->info['tar']; unset($getid3_temp, $getid3_tar); unlink($temp_tar_filename); } else { $this->error('Unable to fopen() temp file to parse TAR inside GZIP file'); break; } } break; case '': default: // unknown or unhandled format break; } } else { $this->warning('PHP is not compiled with gzinflate() support. Please enable PHP Zlib extension or recompile with the --with-zlib switch'); } } } return true; } /** * Converts the OS type. * * @param string $key * * @return string */ public function get_os_type($key) { static $os_type = array( '0' => 'FAT filesystem (MS-DOS, OS/2, NT/Win32)', '1' => 'Amiga', '2' => 'VMS (or OpenVMS)', '3' => 'Unix', '4' => 'VM/CMS', '5' => 'Atari TOS', '6' => 'HPFS filesystem (OS/2, NT)', '7' => 'Macintosh', '8' => 'Z-System', '9' => 'CP/M', '10' => 'TOPS-20', '11' => 'NTFS filesystem (NT)', '12' => 'QDOS', '13' => 'Acorn RISCOS', '255' => 'unknown' ); return (isset($os_type[$key]) ? $os_type[$key] : ''); } /** * Converts the eXtra FLags. * * @param string $key * * @return string */ public function get_xflag_type($key) { static $xflag_type = array( '0' => 'unknown', '2' => 'maximum compression', '4' => 'fastest algorithm' ); return (isset($xflag_type[$key]) ? $xflag_type[$key] : ''); } }