- Generated on Wed Oct 1 2014 21:48:51 for MediaWiki by
1.7.6.1
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MediaWiki
REL1_22
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00001 <?php 00027 class IEContentAnalyzer { 00031 protected $baseTypeTable = array( 00032 'ambiguous' /*1*/ => array( 00033 'text/plain', 00034 'application/octet-stream', 00035 'application/x-netcdf', // [sic] 00036 ), 00037 'text' /*3*/ => array( 00038 'text/richtext', 'image/x-bitmap', 'application/postscript', 'application/base64', 00039 'application/macbinhex40', 'application/x-cdf', 'text/scriptlet' 00040 ), 00041 'binary' /*4*/ => array( 00042 'application/pdf', 'audio/x-aiff', 'audio/basic', 'audio/wav', 'image/gif', 00043 'image/pjpeg', 'image/jpeg', 'image/tiff', 'image/x-png', 'image/png', 'image/bmp', 00044 'image/x-jg', 'image/x-art', 'image/x-emf', 'image/x-wmf', 'video/avi', 00045 'video/x-msvideo', 'video/mpeg', 'application/x-compressed', 00046 'application/x-zip-compressed', 'application/x-gzip-compressed', 'application/java', 00047 'application/x-msdownload' 00048 ), 00049 'html' /*5*/ => array( 'text/html' ), 00050 ); 00051 00055 protected $addedTypes = array( 00056 'ie07' => array( 00057 'text' => array( 'text/xml', 'application/xml' ) 00058 ), 00059 ); 00060 00067 protected $registry = array( 00068 '.323' => 'text/h323', 00069 '.3g2' => 'video/3gpp2', 00070 '.3gp' => 'video/3gpp', 00071 '.3gp2' => 'video/3gpp2', 00072 '.3gpp' => 'video/3gpp', 00073 '.aac' => 'audio/aac', 00074 '.ac3' => 'audio/ac3', 00075 '.accda' => 'application/msaccess', 00076 '.accdb' => 'application/msaccess', 00077 '.accdc' => 'application/msaccess', 00078 '.accde' => 'application/msaccess', 00079 '.accdr' => 'application/msaccess', 00080 '.accdt' => 'application/msaccess', 00081 '.ade' => 'application/msaccess', 00082 '.adp' => 'application/msaccess', 00083 '.adts' => 'audio/aac', 00084 '.ai' => 'application/postscript', 00085 '.aif' => 'audio/aiff', 00086 '.aifc' => 'audio/aiff', 00087 '.aiff' => 'audio/aiff', 00088 '.amc' => 'application/x-mpeg', 00089 '.application' => 'application/x-ms-application', 00090 '.asf' => 'video/x-ms-asf', 00091 '.asx' => 'video/x-ms-asf', 00092 '.au' => 'audio/basic', 00093 '.avi' => 'video/avi', 00094 '.bmp' => 'image/bmp', 00095 '.caf' => 'audio/x-caf', 00096 '.cat' => 'application/vnd.ms-pki.seccat', 00097 '.cbo' => 'application/sha', 00098 '.cdda' => 'audio/aiff', 00099 '.cer' => 'application/x-x509-ca-cert', 00100 '.conf' => 'text/plain', 00101 '.crl' => 'application/pkix-crl', 00102 '.crt' => 'application/x-x509-ca-cert', 00103 '.css' => 'text/css', 00104 '.csv' => 'application/vnd.ms-excel', 00105 '.der' => 'application/x-x509-ca-cert', 00106 '.dib' => 'image/bmp', 00107 '.dif' => 'video/x-dv', 00108 '.dll' => 'application/x-msdownload', 00109 '.doc' => 'application/msword', 00110 '.docm' => 'application/vnd.ms-word.document.macroEnabled.12', 00111 '.docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', 00112 '.dot' => 'application/msword', 00113 '.dotm' => 'application/vnd.ms-word.template.macroEnabled.12', 00114 '.dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template', 00115 '.dv' => 'video/x-dv', 00116 '.dwfx' => 'model/vnd.dwfx+xps', 00117 '.edn' => 'application/vnd.adobe.edn', 00118 '.eml' => 'message/rfc822', 00119 '.eps' => 'application/postscript', 00120 '.etd' => 'application/x-ebx', 00121 '.exe' => 'application/x-msdownload', 00122 '.fdf' => 'application/vnd.fdf', 00123 '.fif' => 'application/fractals', 00124 '.gif' => 'image/gif', 00125 '.gsm' => 'audio/x-gsm', 00126 '.hqx' => 'application/mac-binhex40', 00127 '.hta' => 'application/hta', 00128 '.htc' => 'text/x-component', 00129 '.htm' => 'text/html', 00130 '.html' => 'text/html', 00131 '.htt' => 'text/webviewhtml', 00132 '.hxa' => 'application/xml', 00133 '.hxc' => 'application/xml', 00134 '.hxd' => 'application/octet-stream', 00135 '.hxe' => 'application/xml', 00136 '.hxf' => 'application/xml', 00137 '.hxh' => 'application/octet-stream', 00138 '.hxi' => 'application/octet-stream', 00139 '.hxk' => 'application/xml', 00140 '.hxq' => 'application/octet-stream', 00141 '.hxr' => 'application/octet-stream', 00142 '.hxs' => 'application/octet-stream', 00143 '.hxt' => 'application/xml', 00144 '.hxv' => 'application/xml', 00145 '.hxw' => 'application/octet-stream', 00146 '.ico' => 'image/x-icon', 00147 '.iii' => 'application/x-iphone', 00148 '.ins' => 'application/x-internet-signup', 00149 '.iqy' => 'text/x-ms-iqy', 00150 '.isp' => 'application/x-internet-signup', 00151 '.jfif' => 'image/jpeg', 00152 '.jnlp' => 'application/x-java-jnlp-file', 00153 '.jpe' => 'image/jpeg', 00154 '.jpeg' => 'image/jpeg', 00155 '.jpg' => 'image/jpeg', 00156 '.jtx' => 'application/x-jtx+xps', 00157 '.latex' => 'application/x-latex', 00158 '.log' => 'text/plain', 00159 '.m1v' => 'video/mpeg', 00160 '.m2v' => 'video/mpeg', 00161 '.m3u' => 'audio/x-mpegurl', 00162 '.mac' => 'image/x-macpaint', 00163 '.man' => 'application/x-troff-man', 00164 '.mda' => 'application/msaccess', 00165 '.mdb' => 'application/msaccess', 00166 '.mde' => 'application/msaccess', 00167 '.mfp' => 'application/x-shockwave-flash', 00168 '.mht' => 'message/rfc822', 00169 '.mhtml' => 'message/rfc822', 00170 '.mid' => 'audio/mid', 00171 '.midi' => 'audio/mid', 00172 '.mod' => 'video/mpeg', 00173 '.mov' => 'video/quicktime', 00174 '.mp2' => 'video/mpeg', 00175 '.mp2v' => 'video/mpeg', 00176 '.mp3' => 'audio/mpeg', 00177 '.mp4' => 'video/mp4', 00178 '.mpa' => 'video/mpeg', 00179 '.mpe' => 'video/mpeg', 00180 '.mpeg' => 'video/mpeg', 00181 '.mpf' => 'application/vnd.ms-mediapackage', 00182 '.mpg' => 'video/mpeg', 00183 '.mpv2' => 'video/mpeg', 00184 '.mqv' => 'video/quicktime', 00185 '.NMW' => 'application/nmwb', 00186 '.nws' => 'message/rfc822', 00187 '.odc' => 'text/x-ms-odc', 00188 '.ols' => 'application/vnd.ms-publisher', 00189 '.p10' => 'application/pkcs10', 00190 '.p12' => 'application/x-pkcs12', 00191 '.p7b' => 'application/x-pkcs7-certificates', 00192 '.p7c' => 'application/pkcs7-mime', 00193 '.p7m' => 'application/pkcs7-mime', 00194 '.p7r' => 'application/x-pkcs7-certreqresp', 00195 '.p7s' => 'application/pkcs7-signature', 00196 '.pct' => 'image/pict', 00197 '.pdf' => 'application/pdf', 00198 '.pdx' => 'application/vnd.adobe.pdx', 00199 '.pfx' => 'application/x-pkcs12', 00200 '.pic' => 'image/pict', 00201 '.pict' => 'image/pict', 00202 '.pinstall' => 'application/x-picasa-detect', 00203 '.pko' => 'application/vnd.ms-pki.pko', 00204 '.png' => 'image/png', 00205 '.pnt' => 'image/x-macpaint', 00206 '.pntg' => 'image/x-macpaint', 00207 '.pot' => 'application/vnd.ms-powerpoint', 00208 '.potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12', 00209 '.potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template', 00210 '.ppa' => 'application/vnd.ms-powerpoint', 00211 '.ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12', 00212 '.pps' => 'application/vnd.ms-powerpoint', 00213 '.ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12', 00214 '.ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow', 00215 '.ppt' => 'application/vnd.ms-powerpoint', 00216 '.pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12', 00217 '.pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation', 00218 '.prf' => 'application/pics-rules', 00219 '.ps' => 'application/postscript', 00220 '.pub' => 'application/vnd.ms-publisher', 00221 '.pwz' => 'application/vnd.ms-powerpoint', 00222 '.py' => 'text/plain', 00223 '.pyw' => 'text/plain', 00224 '.qht' => 'text/x-html-insertion', 00225 '.qhtm' => 'text/x-html-insertion', 00226 '.qt' => 'video/quicktime', 00227 '.qti' => 'image/x-quicktime', 00228 '.qtif' => 'image/x-quicktime', 00229 '.qtl' => 'application/x-quicktimeplayer', 00230 '.rat' => 'application/rat-file', 00231 '.rmf' => 'application/vnd.adobe.rmf', 00232 '.rmi' => 'audio/mid', 00233 '.rqy' => 'text/x-ms-rqy', 00234 '.rtf' => 'application/msword', 00235 '.sct' => 'text/scriptlet', 00236 '.sd2' => 'audio/x-sd2', 00237 '.sdp' => 'application/sdp', 00238 '.shtml' => 'text/html', 00239 '.sit' => 'application/x-stuffit', 00240 '.sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12', 00241 '.sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide', 00242 '.slk' => 'application/vnd.ms-excel', 00243 '.snd' => 'audio/basic', 00244 '.so' => 'application/x-apachemodule', 00245 '.sol' => 'text/plain', 00246 '.sor' => 'text/plain', 00247 '.spc' => 'application/x-pkcs7-certificates', 00248 '.spl' => 'application/futuresplash', 00249 '.sst' => 'application/vnd.ms-pki.certstore', 00250 '.stl' => 'application/vnd.ms-pki.stl', 00251 '.swf' => 'application/x-shockwave-flash', 00252 '.thmx' => 'application/vnd.ms-officetheme', 00253 '.tif' => 'image/tiff', 00254 '.tiff' => 'image/tiff', 00255 '.txt' => 'text/plain', 00256 '.uls' => 'text/iuls', 00257 '.vcf' => 'text/x-vcard', 00258 '.vdx' => 'application/vnd.ms-visio.viewer', 00259 '.vsd' => 'application/vnd.ms-visio.viewer', 00260 '.vss' => 'application/vnd.ms-visio.viewer', 00261 '.vst' => 'application/vnd.ms-visio.viewer', 00262 '.vsx' => 'application/vnd.ms-visio.viewer', 00263 '.vtx' => 'application/vnd.ms-visio.viewer', 00264 '.wav' => 'audio/wav', 00265 '.wax' => 'audio/x-ms-wax', 00266 '.wbk' => 'application/msword', 00267 '.wdp' => 'image/vnd.ms-photo', 00268 '.wiz' => 'application/msword', 00269 '.wm' => 'video/x-ms-wm', 00270 '.wma' => 'audio/x-ms-wma', 00271 '.wmd' => 'application/x-ms-wmd', 00272 '.wmv' => 'video/x-ms-wmv', 00273 '.wmx' => 'video/x-ms-wmx', 00274 '.wmz' => 'application/x-ms-wmz', 00275 '.wpl' => 'application/vnd.ms-wpl', 00276 '.wsc' => 'text/scriptlet', 00277 '.wvx' => 'video/x-ms-wvx', 00278 '.xaml' => 'application/xaml+xml', 00279 '.xbap' => 'application/x-ms-xbap', 00280 '.xdp' => 'application/vnd.adobe.xdp+xml', 00281 '.xfdf' => 'application/vnd.adobe.xfdf', 00282 '.xht' => 'application/xhtml+xml', 00283 '.xhtml' => 'application/xhtml+xml', 00284 '.xla' => 'application/vnd.ms-excel', 00285 '.xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12', 00286 '.xlk' => 'application/vnd.ms-excel', 00287 '.xll' => 'application/vnd.ms-excel', 00288 '.xlm' => 'application/vnd.ms-excel', 00289 '.xls' => 'application/vnd.ms-excel', 00290 '.xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12', 00291 '.xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12', 00292 '.xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 00293 '.xlt' => 'application/vnd.ms-excel', 00294 '.xltm' => 'application/vnd.ms-excel.template.macroEnabled.12', 00295 '.xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template', 00296 '.xlw' => 'application/vnd.ms-excel', 00297 '.xml' => 'text/xml', 00298 '.xps' => 'application/vnd.ms-xpsdocument', 00299 '.xsl' => 'text/xml', 00300 ); 00301 00307 protected $versions = array( 'ie05', 'ie06', 'ie07', 'ie07.strict', 'ie07.nohtml' ); 00308 00312 protected $typeTable = array(); 00313 00315 function __construct() { 00316 // Construct versioned type arrays from the base type array plus additions 00317 $types = $this->baseTypeTable; 00318 foreach ( $this->versions as $version ) { 00319 if ( isset( $this->addedTypes[$version] ) ) { 00320 foreach ( $this->addedTypes[$version] as $format => $addedTypes ) { 00321 $types[$format] = array_merge( $types[$format], $addedTypes ); 00322 } 00323 } 00324 $this->typeTable[$version] = $types; 00325 } 00326 } 00327 00338 public function getRealMimesFromData( $fileName, $chunk, $proposed ) { 00339 $types = $this->getMimesFromData( $fileName, $chunk, $proposed ); 00340 $types = array_map( array( $this, 'translateMimeType' ), $types ); 00341 return $types; 00342 } 00343 00350 public function translateMimeType( $type ) { 00351 static $table = array( 00352 'image/pjpeg' => 'image/jpeg', 00353 'image/x-png' => 'image/png', 00354 'image/x-wmf' => 'application/x-msmetafile', 00355 'image/bmp' => 'image/x-bmp', 00356 'application/x-zip-compressed' => 'application/zip', 00357 'application/x-compressed' => 'application/x-compress', 00358 'application/x-gzip-compressed' => 'application/x-gzip', 00359 'audio/mid' => 'audio/midi', 00360 ); 00361 if ( isset( $table[$type] ) ) { 00362 $type = $table[$type]; 00363 } 00364 return $type; 00365 } 00366 00376 public function getMimesFromData( $fileName, $chunk, $proposed ) { 00377 $types = array(); 00378 foreach ( $this->versions as $version ) { 00379 $types[$version] = $this->getMimeTypeForVersion( $version, $fileName, $chunk, $proposed ); 00380 } 00381 return $types; 00382 } 00383 00392 protected function getMimeTypeForVersion( $version, $fileName, $chunk, $proposed ) { 00393 // Strip text after a semicolon 00394 $semiPos = strpos( $proposed, ';' ); 00395 if ( $semiPos !== false ) { 00396 $proposed = substr( $proposed, 0, $semiPos ); 00397 } 00398 00399 $proposedFormat = $this->getDataFormat( $version, $proposed ); 00400 if ( $proposedFormat == 'unknown' 00401 && $proposed != 'multipart/mixed' 00402 && $proposed != 'multipart/x-mixed-replace' ) 00403 { 00404 return $proposed; 00405 } 00406 if ( strval( $chunk ) === '' ) { 00407 return $proposed; 00408 } 00409 00410 // Truncate chunk at 255 bytes 00411 $chunk = substr( $chunk, 0, 255 ); 00412 00413 // IE does the Check*Headers() calls last, and instead does the following image 00414 // type checks by directly looking for the magic numbers. What I do here should 00415 // have the same effect since the magic number checks are identical in both cases. 00416 $result = $this->sampleData( $version, $chunk ); 00417 $sampleFound = $result['found']; 00418 $counters = $result['counters']; 00419 $binaryType = $this->checkBinaryHeaders( $version, $chunk ); 00420 $textType = $this->checkTextHeaders( $version, $chunk ); 00421 00422 if ( $proposed == 'text/html' && isset( $sampleFound['html'] ) ) { 00423 return 'text/html'; 00424 } 00425 if ( $proposed == 'image/gif' && $binaryType == 'image/gif' ) { 00426 return 'image/gif'; 00427 } 00428 if ( ( $proposed == 'image/pjpeg' || $proposed == 'image/jpeg' ) 00429 && $binaryType == 'image/pjpeg' ) 00430 { 00431 return $proposed; 00432 } 00433 // PNG check added in IE 7 00434 if ( $version >= 'ie07' 00435 && ( $proposed == 'image/x-png' || $proposed == 'image/png' ) 00436 && $binaryType == 'image/x-png' ) 00437 { 00438 return $proposed; 00439 } 00440 00441 // CDF was removed in IE 7 so it won't be in $sampleFound for later versions 00442 if ( isset( $sampleFound['cdf'] ) ) { 00443 return 'application/x-cdf'; 00444 } 00445 00446 // RSS and Atom were added in IE 7 so they won't be in $sampleFound for 00447 // previous versions 00448 if ( isset( $sampleFound['rss'] ) ) { 00449 return 'application/rss+xml'; 00450 } 00451 if ( isset( $sampleFound['rdf-tag'] ) 00452 && isset( $sampleFound['rdf-url'] ) 00453 && isset( $sampleFound['rdf-purl'] ) ) 00454 { 00455 return 'application/rss+xml'; 00456 } 00457 if ( isset( $sampleFound['atom'] ) ) { 00458 return 'application/atom+xml'; 00459 } 00460 00461 if ( isset( $sampleFound['xml'] ) ) { 00462 // TODO: I'm not sure under what circumstances this flag is enabled 00463 if ( strpos( $version, 'strict' ) !== false ) { 00464 if ( $proposed == 'text/html' || $proposed == 'text/xml' ) { 00465 return 'text/xml'; 00466 } 00467 } else { 00468 return 'text/xml'; 00469 } 00470 } 00471 if ( isset( $sampleFound['html'] ) ) { 00472 // TODO: I'm not sure under what circumstances this flag is enabled 00473 if ( strpos( $version, 'nohtml' ) !== false ) { 00474 if ( $proposed == 'text/plain' ) { 00475 return 'text/html'; 00476 } 00477 } else { 00478 return 'text/html'; 00479 } 00480 } 00481 if ( isset( $sampleFound['xbm'] ) ) { 00482 return 'image/x-bitmap'; 00483 } 00484 if ( isset( $sampleFound['binhex'] ) ) { 00485 return 'application/macbinhex40'; 00486 } 00487 if ( isset( $sampleFound['scriptlet'] ) ) { 00488 if ( strpos( $version, 'strict' ) !== false ) { 00489 if ( $proposed == 'text/plain' || $proposed == 'text/scriptlet' ) { 00490 return 'text/scriptlet'; 00491 } 00492 } else { 00493 return 'text/scriptlet'; 00494 } 00495 } 00496 00497 // Freaky heuristics to determine if the data is text or binary 00498 // The heuristic is of course broken for non-ASCII text 00499 if ( $counters['ctrl'] != 0 && ( $counters['ff'] + $counters['low'] ) 00500 < ( $counters['ctrl'] + $counters['high'] ) * 16 ) 00501 { 00502 $kindOfBinary = true; 00503 $type = $binaryType ? $binaryType : $textType; 00504 if ( $type === false ) { 00505 $type = 'application/octet-stream'; 00506 } 00507 } else { 00508 $kindOfBinary = false; 00509 $type = $textType ? $textType : $binaryType; 00510 if ( $type === false ) { 00511 $type = 'text/plain'; 00512 } 00513 } 00514 00515 // Check if the output format is ambiguous 00516 // This generally means that detection failed, real types aren't ambiguous 00517 $detectedFormat = $this->getDataFormat( $version, $type ); 00518 if ( $detectedFormat != 'ambiguous' ) { 00519 return $type; 00520 } 00521 00522 if ( $proposedFormat != 'ambiguous' ) { 00523 // FormatAgreesWithData() 00524 if ( $proposedFormat == 'text' && !$kindOfBinary ) { 00525 return $proposed; 00526 } 00527 if ( $proposedFormat == 'binary' && $kindOfBinary ) { 00528 return $proposed; 00529 } 00530 if ( $proposedFormat == 'html' ) { 00531 return $proposed; 00532 } 00533 } 00534 00535 // Find a MIME type by searching the registry for the file extension. 00536 $dotPos = strrpos( $fileName, '.' ); 00537 if ( $dotPos === false ) { 00538 return $type; 00539 } 00540 $ext = substr( $fileName, $dotPos ); 00541 if ( isset( $this->registry[$ext] ) ) { 00542 return $this->registry[$ext]; 00543 } 00544 00545 // TODO: If the extension has an application registered to it, IE will return 00546 // application/octet-stream. We'll skip that, so we could erroneously 00547 // return text/plain or application/x-netcdf where application/octet-stream 00548 // would be correct. 00549 00550 return $type; 00551 } 00552 00560 private function checkTextHeaders( $version, $chunk ) { 00561 $chunk2 = substr( $chunk, 0, 2 ); 00562 $chunk4 = substr( $chunk, 0, 4 ); 00563 $chunk5 = substr( $chunk, 0, 5 ); 00564 if ( $chunk4 == '%PDF' ) { 00565 return 'application/pdf'; 00566 } 00567 if ( $chunk2 == '%!' ) { 00568 return 'application/postscript'; 00569 } 00570 if ( $chunk5 == '{\\rtf' ) { 00571 return 'text/richtext'; 00572 } 00573 if ( $chunk5 == 'begin' ) { 00574 return 'application/base64'; 00575 } 00576 return false; 00577 } 00578 00586 private function checkBinaryHeaders( $version, $chunk ) { 00587 $chunk2 = substr( $chunk, 0, 2 ); 00588 $chunk3 = substr( $chunk, 0, 3 ); 00589 $chunk4 = substr( $chunk, 0, 4 ); 00590 $chunk5 = substr( $chunk, 0, 5 ); 00591 $chunk5uc = strtoupper( $chunk5 ); 00592 $chunk8 = substr( $chunk, 0, 8 ); 00593 if ( $chunk5uc == 'GIF87' || $chunk5uc == 'GIF89' ) { 00594 return 'image/gif'; 00595 } 00596 if ( $chunk2 == "\xff\xd8" ) { 00597 return 'image/pjpeg'; // actually plain JPEG but this is what IE returns 00598 } 00599 00600 if ( $chunk2 == 'BM' 00601 && substr( $chunk, 6, 2 ) == "\000\000" 00602 && substr( $chunk, 8, 2 ) == "\000\000" ) 00603 { 00604 return 'image/bmp'; // another non-standard MIME 00605 } 00606 if ( $chunk4 == 'RIFF' 00607 && substr( $chunk, 8, 4 ) == 'WAVE' ) 00608 { 00609 return 'audio/wav'; 00610 } 00611 // These were integer literals in IE 00612 // Perhaps the author was not sure what the target endianness was 00613 if ( $chunk4 == ".sd\000" 00614 || $chunk4 == ".snd" 00615 || $chunk4 == "\000ds." 00616 || $chunk4 == "dns." ) 00617 { 00618 return 'audio/basic'; 00619 } 00620 if ( $chunk3 == "MM\000" ) { 00621 return 'image/tiff'; 00622 } 00623 if ( $chunk2 == 'MZ' ) { 00624 return 'application/x-msdownload'; 00625 } 00626 if ( $chunk8 == "\x89PNG\x0d\x0a\x1a\x0a" ) { 00627 return 'image/x-png'; // [sic] 00628 } 00629 if ( strlen( $chunk ) >= 5 ) { 00630 $byte2 = ord( $chunk[2] ); 00631 $byte4 = ord( $chunk[4] ); 00632 if ( $byte2 >= 3 && $byte2 <= 31 && $byte4 == 0 && $chunk2 == 'JG' ) { 00633 return 'image/x-jg'; 00634 } 00635 } 00636 // More endian confusion? 00637 if ( $chunk4 == 'MROF' ) { 00638 return 'audio/x-aiff'; 00639 } 00640 $chunk4_8 = substr( $chunk, 8, 4 ); 00641 if ( $chunk4 == 'FORM' && ( $chunk4_8 == 'AIFF' || $chunk4_8 == 'AIFC' ) ) { 00642 return 'audio/x-aiff'; 00643 } 00644 if ( $chunk4 == 'RIFF' && $chunk4_8 == 'AVI ' ) { 00645 return 'video/avi'; 00646 } 00647 if ( $chunk4 == "\x00\x00\x01\xb3" || $chunk4 == "\x00\x00\x01\xba" ) { 00648 return 'video/mpeg'; 00649 } 00650 if ( $chunk4 == "\001\000\000\000" 00651 && substr( $chunk, 40, 4 ) == ' EMF' ) 00652 { 00653 return 'image/x-emf'; 00654 } 00655 if ( $chunk4 == "\xd7\xcd\xc6\x9a" ) { 00656 return 'image/x-wmf'; 00657 } 00658 if ( $chunk4 == "\xca\xfe\xba\xbe" ) { 00659 return 'application/java'; 00660 } 00661 if ( $chunk2 == 'PK' ) { 00662 return 'application/x-zip-compressed'; 00663 } 00664 if ( $chunk2 == "\x1f\x9d" ) { 00665 return 'application/x-compressed'; 00666 } 00667 if ( $chunk2 == "\x1f\x8b" ) { 00668 return 'application/x-gzip-compressed'; 00669 } 00670 // Skip redundant check for ZIP 00671 if ( $chunk5 == "MThd\000" ) { 00672 return 'audio/mid'; 00673 } 00674 if ( $chunk4 == '%PDF' ) { 00675 return 'application/pdf'; 00676 } 00677 return false; 00678 } 00679 00687 protected function sampleData( $version, $chunk ) { 00688 $found = array(); 00689 $counters = array( 00690 'ctrl' => 0, 00691 'high' => 0, 00692 'low' => 0, 00693 'lf' => 0, 00694 'cr' => 0, 00695 'ff' => 0 00696 ); 00697 $htmlTags = array( 00698 'html', 00699 'head', 00700 'title', 00701 'body', 00702 'script', 00703 'a href', 00704 'pre', 00705 'img', 00706 'plaintext', 00707 'table' 00708 ); 00709 $rdfUrl = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'; 00710 $rdfPurl = 'http://purl.org/rss/1.0/'; 00711 $xbmMagic1 = '#define'; 00712 $xbmMagic2 = '_width'; 00713 $xbmMagic3 = '_bits'; 00714 $binhexMagic = 'converted with BinHex'; 00715 00716 for ( $offset = 0; $offset < strlen( $chunk ); $offset++ ) { 00717 $curChar = $chunk[$offset]; 00718 if ( $curChar == "\x0a" ) { 00719 $counters['lf']++; 00720 continue; 00721 } elseif ( $curChar == "\x0d" ) { 00722 $counters['cr']++; 00723 continue; 00724 } elseif ( $curChar == "\x0c" ) { 00725 $counters['ff']++; 00726 continue; 00727 } elseif ( $curChar == "\t" ) { 00728 $counters['low']++; 00729 continue; 00730 } elseif ( ord( $curChar ) < 32 ) { 00731 $counters['ctrl']++; 00732 continue; 00733 } elseif ( ord( $curChar ) >= 128 ) { 00734 $counters['high']++; 00735 continue; 00736 } 00737 00738 $counters['low']++; 00739 if ( $curChar == '<' ) { 00740 // XML 00741 $remainder = substr( $chunk, $offset + 1 ); 00742 if ( !strncasecmp( $remainder, '?XML', 4 ) ) { 00743 $nextChar = substr( $chunk, $offset + 5, 1 ); 00744 if ( $nextChar == ':' || $nextChar == ' ' || $nextChar == "\t" ) { 00745 $found['xml'] = true; 00746 } 00747 } 00748 // Scriptlet (JSP) 00749 if ( !strncasecmp( $remainder, 'SCRIPTLET', 9 ) ) { 00750 $found['scriptlet'] = true; 00751 break; 00752 } 00753 // HTML 00754 foreach ( $htmlTags as $tag ) { 00755 if ( !strncasecmp( $remainder, $tag, strlen( $tag ) ) ) { 00756 $found['html'] = true; 00757 } 00758 } 00759 // Skip broken check for additional tags (HR etc.) 00760 00761 // CHANNEL replaced by RSS, RDF and FEED in IE 7 00762 if ( $version < 'ie07' ) { 00763 if ( !strncasecmp( $remainder, 'CHANNEL', 7 ) ) { 00764 $found['cdf'] = true; 00765 } 00766 } else { 00767 // RSS 00768 if ( !strncasecmp( $remainder, 'RSS', 3 ) ) { 00769 $found['rss'] = true; 00770 break; // return from SampleData 00771 } 00772 if ( !strncasecmp( $remainder, 'rdf:RDF', 7 ) ) { 00773 $found['rdf-tag'] = true; 00774 // no break 00775 } 00776 if ( !strncasecmp( $remainder, 'FEED', 4 ) ) { 00777 $found['atom'] = true; 00778 break; 00779 } 00780 } 00781 continue; 00782 } 00783 // Skip broken check for --> 00784 00785 // RSS URL checks 00786 // For some reason both URLs must appear before it is recognised 00787 $remainder = substr( $chunk, $offset ); 00788 if ( !strncasecmp( $remainder, $rdfUrl, strlen( $rdfUrl ) ) ) { 00789 $found['rdf-url'] = true; 00790 if ( isset( $found['rdf-tag'] ) 00791 && isset( $found['rdf-purl'] ) ) // [sic] 00792 { 00793 break; 00794 } 00795 continue; 00796 } 00797 00798 if ( !strncasecmp( $remainder, $rdfPurl, strlen( $rdfPurl ) ) ) { 00799 if ( isset( $found['rdf-tag'] ) 00800 && isset( $found['rdf-url'] ) ) // [sic] 00801 { 00802 break; 00803 } 00804 continue; 00805 } 00806 00807 // XBM checks 00808 if ( !strncasecmp( $remainder, $xbmMagic1, strlen( $xbmMagic1 ) ) ) { 00809 $found['xbm1'] = true; 00810 continue; 00811 } 00812 if ( $curChar == '_' ) { 00813 if ( isset( $found['xbm2'] ) ) { 00814 if ( !strncasecmp( $remainder, $xbmMagic3, strlen( $xbmMagic3 ) ) ) { 00815 $found['xbm'] = true; 00816 break; 00817 } 00818 } elseif ( isset( $found['xbm1'] ) ) { 00819 if ( !strncasecmp( $remainder, $xbmMagic2, strlen( $xbmMagic2 ) ) ) { 00820 $found['xbm2'] = true; 00821 } 00822 } 00823 } 00824 00825 // BinHex 00826 if ( !strncmp( $remainder, $binhexMagic, strlen( $binhexMagic ) ) ) { 00827 $found['binhex'] = true; 00828 } 00829 } 00830 return array( 'found' => $found, 'counters' => $counters ); 00831 } 00832 00838 protected function getDataFormat( $version, $type ) { 00839 $types = $this->typeTable[$version]; 00840 if ( $type == '(null)' || strval( $type ) === '' ) { 00841 return 'ambiguous'; 00842 } 00843 foreach ( $types as $format => $list ) { 00844 if ( in_array( $type, $list ) ) { 00845 return $format; 00846 } 00847 } 00848 return 'unknown'; 00849 } 00850 }
1.7.6.1