includes/MimeMagic.php

   1 <?php
   2 /** Module defining helper functions for detecting and dealing with mime types.
   3  *
   4  * @package MediaWiki
   5  */
   6
   7  /** Defines a set of well known mime types
   8  * This is used as a fallback to mime.types files.
   9  * An extensive list of well known mime types is provided by
  10  * the file mime.types in the includes directory.
  11  */
  12 define('MM_WELL_KNOWN_MIME_TYPES',<<<END_STRING
  13 application/ogg ogg ogm
  14 application/pdf pdf
  15 application/x-javascript js
  16 application/x-shockwave-flash swf
  17 audio/midi mid midi kar
  18 audio/mpeg mpga mpa mp2 mp3
  19 audio/x-aiff aif aiff aifc
  20 audio/x-wav wav
  21 audio/ogg ogg
  22 image/x-bmp bmp
  23 image/gif gif
  24 image/jpeg jpeg jpg jpe
  25 image/png png
  26 image/svg+xml svg
  27 image/tiff tiff tif
  28 text/plain txt
  29 text/html html htm
  30 video/ogg ogm ogg
  31 video/mpeg mpg mpeg
  32 END_STRING
  33 );
  34
  35  /** Defines a set of well known mime info entries
  36  * This is used as a fallback to mime.info files.
  37  * An extensive list of well known mime types is provided by
  38  * the file mime.info in the includes directory.
  39  */
  40 define('MM_WELL_KNOWN_MIME_INFO', <<<END_STRING
  41 application/pdf [OFFICE]
  42 text/javascript application/x-javascript [EXECUTABLE]
  43 application/x-shockwave-flash [MULTIMEDIA]
  44 audio/midi [AUDIO]
  45 audio/x-aiff [AUDIO]
  46 audio/x-wav [AUDIO]
  47 audio/mp3 audio/mpeg [AUDIO]
  48 application/ogg audio/ogg video/ogg [MULTIMEDIA]
  49 image/x-bmp image/bmp [BITMAP]
  50 image/gif [BITMAP]
  51 image/jpeg [BITMAP]
  52 image/png [BITMAP]
  53 image/svg image/svg+xml [DRAWING]
  54 image/tiff [BITMAP]
  55 text/plain [TEXT]
  56 text/html [TEXT]
  57 video/ogg [VIDEO]
  58 video/mpeg [VIDEO]
  59 unknown/unknown application/octet-stream application/x-empty [UNKNOWN]
  60 END_STRING
  61 );
  62
  63 #note: because this file is possibly included by a function,
  64 #we need to access the global scope explicitely!
  65 global $wgLoadFileinfoExtension;
  66
  67 if ($wgLoadFileinfoExtension) {
  68         if(!extension_loaded('fileinfo')) dl('fileinfo.' . PHP_SHLIB_SUFFIX);
  69 }
  70
  71 /** Implements functions related to mime types such as detection and mapping to
  72 * file extension,
  73 *
  74 * Instances of this class are stateles, there only needs to be one global instance
  75 * of MimeMagic. Please use wfGetMimeMagic to get that instance.
  76 */
  77 class MimeMagic {
  78
  79         /**
  80         * Mapping of media types to arrays of mime types.
  81         * This is used by findMediaType and getMediaType, respectively
  82         */
  83         var $mMediaTypes= NULL;
  84
  85         /** Map of mime type aliases
  86         */
  87         var $mMimeTypeAliases= NULL;
  88
  89         /** map of mime types to file extensions (as a space seprarated list)
  90         */
  91         var $mMimeToExt= NULL;
  92
  93         /** map of file extensions types to mime types (as a space seprarated list)
  94         */
  95         var $mExtToMime= NULL;
  96
  97         /** Initializes the MimeMagic object. This is called by wfGetMimeMagic when instantiation
  98         * the global MimeMagic singleton object.
  99         *
 100         * This constructor parses the mime.types and mime.info files and build internal mappings.
 101         */
 102         function MimeMagic() {
 103                 /*
 104                 *   --- load mime.types ---
 105                 */
 106
 107                 global $wgMimeTypeFile;
 108
 109                 $types= MM_WELL_KNOWN_MIME_TYPES;
 110
 111                 if ($wgMimeTypeFile) {
 112                         if (is_file($wgMimeTypeFile) and is_readable($wgMimeTypeFile)) {
 113                                 wfDebug("MimeMagic::MimeMagic: loading mime types from $wgMimeTypeFile\n");
 114
 115                                 $types.= "\n";
 116                                 $types.= file_get_contents($wgMimeTypeFile);
 117                         }
 118                         else wfDebug("MimeMagic::MimeMagic: can't load mime types from $wgMimeTypeFile\n");
 119                 }
 120                 else wfDebug("MimeMagic::MimeMagic: no mime types file defined, using build-ins only.\n");
 121
 122                 $types= str_replace(array("\r\n","\n\r","\n\n","\r\r","\r"),"\n",$types);
 123                 $types= str_replace("\t"," ",$types);
 124
 125                 $this->mMimeToExt= array();
 126                 $this->mToMime= array();
 127
 128                 $lines= explode("\n",$types);
 129                 foreach ($lines as $s) {
 130                         $s= trim($s);
 131                         if (empty($s)) continue;
 132                         if (strpos($s,'#')===0) continue;
 133
 134                         $s= strtolower($s);
 135                         $i= strpos($s,' ');
 136
 137                         if ($i===false) continue;
 138
 139                         #print "processing MIME line $s<br>";
 140
 141                         $mime= substr($s,0,$i);
 142                         $ext= trim(substr($s,$i+1));
 143
 144                         if (empty($ext)) continue;
 145
 146                         if (@$this->mMimeToExt[$mime]) $this->mMimeToExt[$mime] .= ' '.$ext;
 147                         else $this->mMimeToExt[$mime]= $ext;
 148
 149                         $extensions= explode(' ',$ext);
 150
 151                         foreach ($extensions as $e) {
 152                                 $e= trim($e);
 153                                 if (empty($e)) continue;
 154
 155                                 if (@$this->mExtToMime[$e]) $this->mExtToMime[$e] .= ' '.$mime;
 156                                 else $this->mExtToMime[$e]= $mime;
 157                         }
 158                 }
 159
 160                 /*
 161                 *   --- load mime.info ---
 162                 */
 163
 164                 global $wgMimeInfoFile;
 165
 166                 $info= MM_WELL_KNOWN_MIME_INFO;
 167
 168                 if ($wgMimeInfoFile) {
 169                         if (is_file($wgMimeInfoFile) and is_readable($wgMimeInfoFile)) {
 170                                 wfDebug("MimeMagic::MimeMagic: loading mime info from $wgMimeInfoFile\n");
 171
 172                                 $info.= "\n";
 173                                 $info.= file_get_contents($wgMimeInfoFile);
 174                         }
 175                         else wfDebug("MimeMagic::MimeMagic: can't load mime info from $wgMimeInfoFile\n");
 176                 }
 177                 else wfDebug("MimeMagic::MimeMagic: no mime info file defined, using build-ins only.\n");
 178
 179                 $info= str_replace(array("\r\n","\n\r","\n\n","\r\r","\r"),"\n",$info);
 180                 $info= str_replace("\t"," ",$info);
 181
 182                 $this->mMimeTypeAliases= array();
 183                 $this->mMediaTypes= array();
 184
 185                 $lines= explode("\n",$info);
 186                 foreach ($lines as $s) {
 187                         $s= trim($s);
 188                         if (empty($s)) continue;
 189                         if (strpos($s,'#')===0) continue;
 190
 191                         $s= strtolower($s);
 192                         $i= strpos($s,' ');
 193
 194                         if ($i===false) continue;
 195
 196                         #print "processing MIME INFO line $s<br>";
 197
 198                         $match= array();
 199                         if (preg_match('!\[\s*(\w+)\s*\]!',$s,$match)) {
 200                                 $s= preg_replace('!\[\s*(\w+)\s*\]!','',$s);
 201                                 $mtype= trim(strtoupper($match[1]));
 202                         }
 203                         else $mtype= MEDIATYPE_UNKNOWN;
 204
 205                         $m= explode(' ',$s);
 206
 207                         if (!isset($this->mMediaTypes[$mtype])) $this->mMediaTypes[$mtype]= array();
 208
 209                         foreach ($m as $mime) {
 210                                 $mime= trim($mime);
 211                                 if (empty($mime)) continue;
 212
 213                                 $this->mMediaTypes[$mtype][]= $mime;
 214                         }
 215
 216                         if (sizeof($m)>1) {
 217                                 $main= $m[0];
 218                                 for ($i=1; $i<sizeof($m); $i+= 1) {
 219                                         $mime= $m[$i];
 220                                         $this->mMimeTypeAliases[$mime]= $main;
 221                                 }
 222                         }
 223                 }
 224
 225         }
 226
 227         /** returns a list of file extensions for a given mime type
 228         * as a space separated string.
 229         */
 230         function getExtensionsForType($mime) {
 231                 $mime= strtolower($mime);
 232
 233                 $r= @$this->mMimeToExt[$mime];
 234
 235                 if (@!$r and isset($this->mMimeTypeAliases[$mime])) {
 236                         $mime= $this->mMimeTypeAliases[$mime];
 237                         $r= @$this->mMimeToExt[$mime];
 238                 }
 239
 240                 return $r;
 241         }
 242
 243         /** returns a list of mime types for a given file extension
 244         * as a space separated string.
 245         */
 246         function getTypesForExtension($ext) {
 247                 $ext= strtolower($ext);
 248
 249                 $r= @$this->mExtToMime[$ext];
 250                 return $r;
 251         }
 252
 253         /** returns a single mime type for a given file extension.
 254         * This is always the first type from the list returned by getTypesForExtension($ext).
 255         */
 256         function guessTypesForExtension($ext) {
 257                 $m= $this->getTypesForExtension( $ext );
 258                 if( is_null($m) ) return NULL;
 259
 260                 $m= trim( $m );
 261                 $m= preg_replace('/\s.*$/','',$m);
 262
 263                 return $m;
 264         }
 265
 266
 267         /** tests if the extension matches the given mime type.
 268         * returns true if a match was found, NULL if the mime type is unknown,
 269         * and false if the mime type is known but no matches where found.
 270         */
 271         function isMatchingExtension($extension,$mime) {
 272                 $ext= $this->getExtensionsForType($mime);
 273
 274                 if (!$ext) {
 275                         return NULL;  //unknown
 276                 }
 277
 278                 $ext= explode(' ',$ext);
 279
 280                 $extension= strtolower($extension);
 281                 if (in_array($extension,$ext)) {
 282                         return true;
 283                 }
 284
 285                 return false;
 286         }
 287
 288         /** returns true if the mime type is known to represent
 289         * an image format supported by the PHP GD library.
 290         */
 291         function isPHPImageType( $mime ) {
 292                 #as defined by imagegetsize and image_type_to_mime
 293                 static $types = array(
 294                         'image/gif', 'image/jpeg', 'image/png',
 295                         'image/x-bmp', 'image/xbm', 'image/tiff',
 296                         'image/jp2', 'image/jpeg2000', 'image/iff',
 297                         'image/xbm', 'image/x-xbitmap',
 298                         'image/vnd.wap.wbmp', 'image/vnd.xiff',
 299                         'image/x-photoshop',
 300                         'application/x-shockwave-flash',
 301                 );
 302
 303                 return in_array( $mime, $types );
 304         }
 305
 306
 307         /** mime type detection. This uses detectMimeType to detect the mim type of the file,
 308         * but applies additional checks to determine some well known file formats that may be missed
 309         * or misinterpreter by the default mime detection (namely xml based formats like XHTML or SVG).
 310         *
 311         * @param string $file The file to check
 312         * @param bool $useExt switch for allowing to use the file extension to guess the mime type. true by default.
 313         *
 314         * @return string the mime type of $file
 315         */
 316         function guessMimeType( $file, $useExt=true ) {
 317                 $fname = 'MimeMagic::guessMimeType';
 318                 $mime= $this->detectMimeType($file,$useExt);
 319
 320                 if (strpos($mime,"text/")===0 ||
 321                     $mime==="application/xml") {
 322
 323                         // Read a chunk of the file
 324                         $f = fopen( $file, "rt" );
 325                         if( !$f ) return "unknown/unknown";
 326                         $head = fread( $f, 1024 );
 327                         fclose( $f );
 328
 329                         $xml_type= NULL;
 330                         $script_type= NULL;
 331
 332                         /*
 333                         * look for XML formats (XHTML and SVG)
 334                         */
 335                         if ($mime==="text/sgml" ||
 336                             $mime==="text/plain" ||
 337                             $mime==="text/html" ||
 338                             $mime==="text/xml" ||
 339                             $mime==="application/xml") {
 340
 341                                 if (substr($head,0,5)=="<?xml") $xml_type= "ASCII";
 342                                 elseif (substr($head,0,8)=="\xef\xbb\xbf<?xml") $xml_type= "UTF-8";
 343                                 elseif (substr($head,0,10)=="\xfe\xff\x00<\x00?\x00x\x00m\x00l") $xml_type= "UTF-16BE";
 344                                 elseif (substr($head,0,10)=="\xff\xfe<\x00?\x00x\x00m\x00l\x00") $xml_type= "UTF-16LE";
 345
 346                                 if ($xml_type) {
 347                                         if ($xml_type!=="UTF-8" && $xml_type!=="ASCII") $head= iconv($xml_type,"ASCII//IGNORE",$head);
 348
 349                                         $match= array();
 350                                         $doctype= "";
 351                                         $tag= "";
 352
 353                                         if (preg_match('%<!DOCTYPE\s+[\w-]+\s+PUBLIC\s+["'."'".'"](.*?)["'."'".'"].*>%sim',$head,$match)) $doctype= $match[1];
 354                                         if (preg_match('%<(\w+).*>%sim',$head,$match)) $tag= $match[1];
 355
 356                                         #print "<br>ANALYSING $file ($mime): doctype= $doctype; tag= $tag<br>";
 357
 358                                         if (strpos($doctype,"-//W3C//DTD SVG")===0) $mime= "image/svg";
 359                                         elseif ($tag==="svg") $mime= "image/svg";
 360                                         elseif (strpos($doctype,"-//W3C//DTD XHTML")===0) $mime= "text/html";
 361                                         elseif ($tag==="html") $mime= "text/html";
 362
 363                                         $test_more= false;
 364                                 }
 365                         }
 366
 367                         /*
 368                         * look for shell scripts
 369                         */
 370                         if (!$xml_type) {
 371                                 $script_type= NULL;
 372
 373                                 #detect by shebang
 374                                 if (substr($head,0,2)=="#!") $script_type= "ASCII";
 375                                 elseif (substr($head,0,5)=="\xef\xbb\xbf#!") $script_type= "UTF-8";
 376                                 elseif (substr($head,0,7)=="\xfe\xff\x00#\x00!") $script_type= "UTF-16BE";
 377                                 elseif (substr($head,0,7)=="\xff\xfe#\x00!") $script_type= "UTF-16LE";
 378
 379                                 if ($script_type) {
 380                                         if ($script_type!=="UTF-8" && $script_type!=="ASCII") $head= iconv($script_type,"ASCII//IGNORE",$head);
 381
 382                                         $match= array();
 383                                         $prog= "";
 384
 385                                         if (preg_match('%/?([^\s]+/)(w+)%sim',$head,$match)) $script= $match[2];
 386
 387                                         $mime= "application/x-$prog";
 388                                 }
 389                         }
 390
 391                         /*
 392                         * look for PHP
 393                         */
 394                         if( !$xml_type && !$script_type ) {
 395
 396                                 if( ( strpos( $head, '<?php' ) !== false ) ||
 397                                     ( strpos( $head, '<? ' ) !== false ) ||
 398                                     ( strpos( $head, "<?\n" ) !== false ) ||
 399                                     ( strpos( $head, "<?\t" ) !== false ) ||
 400                                     ( strpos( $head, "<?=" ) !== false ) ||
 401
 402                                     ( strpos( $head, "<\x00?\x00p\x00h\x00p" ) !== false ) ||
 403                                     ( strpos( $head, "<\x00?\x00 " ) !== false ) ||
 404                                     ( strpos( $head, "<\x00?\x00\n" ) !== false ) ||
 405                                     ( strpos( $head, "<\x00?\x00\t" ) !== false ) ||
 406                                     ( strpos( $head, "<\x00?\x00=" ) !== false ) ) {
 407
 408                                         $mime= "application/x-php";
 409                                 }
 410                         }
 411
 412                 }
 413
 414                 if (isset($this->mMimeTypeAliases[$mime])) $mime= $this->mMimeTypeAliases[$mime];
 415
 416                 wfDebug("$fname: final mime type of $file: $mime\n");
 417                 return $mime;
 418         }
 419
 420         /** Internal mime type detection, please use guessMimeType() for application code instead.
 421         * Detection is done using an external program, if $wgMimeDetectorCommand is set.
 422         * Otherwise, the fileinfo extension and mime_content_type are tried (in this order), if they are available.
 423         * If the dections fails and $useExt is true, the mime type is guessed from the file extension, using guessTypesForExtension.
 424         * If the mime type is still unknown, getimagesize is used to detect the mime type if the file is an image.
 425         * If no mime type can be determined, this function returns "unknown/unknown".
 426         *
 427         * @param string $file The file to check
 428         * @param bool $useExt switch for allowing to use the file extension to guess the mime type. true by default.
 429         *
 430         * @return string the mime type of $file
 431         * @private
 432         */
 433         function detectMimeType( $file, $useExt=true ) {
 434                 $fname = 'MimeMagic::detectMimeType';
 435
 436                 global $wgMimeDetectorCommand;
 437
 438                 $m= NULL;
 439                 if ($wgMimeDetectorCommand) {
 440                         $fn= wfEscapeShellArg($file);
 441                         $m= `$wgMimeDetectorCommand $fn`;
 442                 }
 443                 else if (function_exists("finfo_open") && function_exists("finfo_file")) {
 444
 445                         # This required the fileinfo extension by PECL,
 446                         # see http://pecl.php.net/package/fileinfo
 447                         # This must be compiled into PHP
 448                         #
 449                         # finfo is the official replacement for the deprecated
 450                         # mime_content_type function, see below.
 451                         #
 452                         # If you may need to load the fileinfo extension at runtime, set
 453                         # $wgLoadFileinfoExtension in LocalSettings.php
 454
 455                         $mime_magic_resource = finfo_open(FILEINFO_MIME); /* return mime type ala mimetype extension */
 456
 457                         if ($mime_magic_resource) {
 458                                 $m= finfo_file($mime_magic_resource, $file);
 459
 460                                 finfo_close($mime_magic_resource);
 461                         }
 462                         else wfDebug("$fname: finfo_open failed on ".FILEINFO_MIME."!\n");
 463                 }
 464                 else if (function_exists("mime_content_type")) {
 465
 466                         # NOTE: this function is available since PHP 4.3.0, but only if
 467                         # PHP was compiled with --with-mime-magic or, before 4.3.2, with --enable-mime-magic.
 468                         #
 469                         # On Winodws, you must set mime_magic.magicfile in php.ini to point to the mime.magic file bundeled with PHP;
 470                         # sometimes, this may even be needed under linus/unix.
 471                         #
 472                         # Also note that this has been DEPRECATED in favor of the fileinfo extension by PECL, see above.
 473                         # see http://www.php.net/manual/en/ref.mime-magic.php for details.
 474
 475                         $m= mime_content_type($file);
 476                 }
 477                 else wfDebug("$fname: no magic mime detector found!\n");
 478
 479                 if ($m) {
 480                         #normalize
 481                         $m= preg_replace('![;, ].*$!','',$m); #strip charset, etc
 482                         $m= trim($m);
 483                         $m= strtolower($m);
 484
 485                         if (strpos($m,'unknown')!==false) $m= NULL;
 486                         else {
 487                                 wfDebug("$fname: magic mime type of $file: $m\n");
 488                                 return $m;
 489                         }
 490                 }
 491
 492                 #if still not known, use getimagesize to find out the type of image
 493                 #TODO: skip things that do not have a well-known image extension? Would that be safe?
 494                 wfSuppressWarnings();
 495                 $gis = getimagesize( $file );
 496                 wfRestoreWarnings();
 497
 498                 $notAnImage= false;
 499
 500                 if ($gis && is_array($gis) && $gis[2]) {
 501                         switch ($gis[2]) {
 502                                 case IMAGETYPE_GIF: $m= "image/gif"; break;
 503                                 case IMAGETYPE_JPEG: $m= "image/jpeg"; break;
 504                                 case IMAGETYPE_PNG: $m= "image/png"; break;
 505                                 case IMAGETYPE_SWF: $m= "application/x-shockwave-flash"; break;
 506                                 case IMAGETYPE_PSD: $m= "application/photoshop"; break;
 507                                 case IMAGETYPE_BMP: $m= "image/bmp"; break;
 508                                 case IMAGETYPE_TIFF_II: $m= "image/tiff"; break;
 509                                 case IMAGETYPE_TIFF_MM: $m= "image/tiff"; break;
 510                                 case IMAGETYPE_JPC: $m= "image"; break;
 511                                 case IMAGETYPE_JP2: $m= "image/jpeg2000"; break;
 512                                 case IMAGETYPE_JPX: $m= "image/jpeg2000"; break;
 513                                 case IMAGETYPE_JB2: $m= "image"; break;
 514                                 case IMAGETYPE_SWC: $m= "application/x-shockwave-flash"; break;
 515                                 case IMAGETYPE_IFF: $m= "image/vnd.xiff"; break;
 516                                 case IMAGETYPE_WBMP: $m= "image/vnd.wap.wbmp"; break;
 517                                 case IMAGETYPE_XBM: $m= "image/x-xbitmap"; break;
 518                         }
 519
 520                         if ($m) {
 521                                 wfDebug("$fname: image mime type of $file: $m\n");
 522                                 return $m;
 523                         }
 524                         else $notAnImage= true;
 525                 }
 526
 527                 #if desired, look at extension as a fallback.
 528                 if ($useExt) {
 529                         $i = strrpos( $file, '.' );
 530                         $e= strtolower( $i ? substr( $file, $i + 1 ) : '' );
 531
 532                         $m= $this->guessTypesForExtension($e);
 533
 534                         #TODO: if $notAnImage is set, do not trust the file extension if
 535                         # the results is one of the image types that should have been recognized
 536                         # by getimagesize
 537
 538                         if ($m) {
 539                                 wfDebug("$fname: extension mime type of $file: $m\n");
 540                                 return $m;
 541                         }
 542                 }
 543
 544                 #unknown type
 545                 wfDebug("$fname: failed to guess mime type for $file!\n");
 546                 return "unknown/unknown";
 547         }
 548
 549         /**
 550         * Determine the media type code for a file, using its mime type, name and possibly
 551         * its contents.
 552         *
 553         * This function relies on the findMediaType(), mapping extensions and mime
 554         * types to media types.
 555         *
 556         * @todo analyse file if need be
 557         * @todo look at multiple extension, separately and together.
 558         *
 559         * @param string $path full path to the image file, in case we have to look at the contents
 560         *        (if null, only the mime type is used to determine the media type code).
 561         * @param string $mime mime type. If null it will be guessed using guessMimeType.
 562         *
 563         * @return (int?string?) a value to be used with the MEDIATYPE_xxx constants.
 564         */
 565         function getMediaType($path=NULL,$mime=NULL) {
 566                 if( !$mime && !$path ) return MEDIATYPE_UNKNOWN;
 567
 568                 #if mime type is unknown, guess it
 569                 if( !$mime ) $mime= $this->guessMimeType($path,false);
 570
 571                 #special code for ogg - detect if it's video (theora),
 572                 #else label it as sound.
 573                 if( $mime=="application/ogg" && file_exists($path) ) {
 574
 575                         // Read a chunk of the file
 576                         $f = fopen( $path, "rt" );
 577                         if( !$f ) return MEDIATYPE_UNKNOWN;
 578                         $head = fread( $f, 256 );
 579                         fclose( $f );
 580
 581                         $head= strtolower( $head );
 582
 583                         #This is an UGLY HACK, file should be parsed correctly
 584                         if( strpos($head,'theora')!==false ) return MEDIATYPE_VIDEO;
 585                         elseif( strpos($head,'vorbis')!==false ) return MEDIATYPE_AUDIO;
 586                         elseif( strpos($head,'flac')!==false ) return MEDIATYPE_AUDIO;
 587                         elseif( strpos($head,'speex')!==false ) return MEDIATYPE_AUDIO;
 588                         else return MEDIATYPE_MULTIMEDIA;
 589                 }
 590
 591                 #check for entry for full mime type
 592                 if( $mime ) {
 593                         $type= $this->findMediaType($mime);
 594                         if( $type!==MEDIATYPE_UNKNOWN ) return $type;
 595                 }
 596
 597                 #check for entry for file extension
 598                 $e= NULL;
 599                 if( $path ) {
 600                         $i = strrpos( $path, '.' );
 601                         $e= strtolower( $i ? substr( $path, $i + 1 ) : '' );
 602
 603                         #TODO: look at multi-extension if this fails, parse from full path
 604
 605                         $type= $this->findMediaType('.'.$e);
 606                         if( $type!==MEDIATYPE_UNKNOWN ) return $type;
 607                 }
 608
 609                 #check major mime type
 610                 if( $mime ) {
 611                         $i= strpos($mime,'/');
 612                         if( $i !== false ) {
 613                                 $major= substr($mime,0,$i);
 614                                 $type= $this->findMediaType($major);
 615                                 if( $type!==MEDIATYPE_UNKNOWN ) return $type;
 616                         }
 617                 }
 618
 619                 if( !$type ) $type= MEDIATYPE_UNKNOWN;
 620
 621                 return $type;
 622         }
 623
 624         /** returns a media code matching the given mime type or file extension.
 625         * File extensions are represented by a string starting with a dot (.) to
 626         * distinguish them from mime types.
 627         *
 628         * This funktion relies on the mapping defined by $this->mMediaTypes
 629         * @private
 630         */
 631         function findMediaType($extMime) {
 632
 633                 if (strpos($extMime,'.')===0) { #if it's an extension, look up the mime types
 634                         $m= $this->getTypesForExtension(substr($extMime,1));
 635                         if (!$m) return MEDIATYPE_UNKNOWN;
 636
 637                         $m= explode(' ',$m);
 638                 }
 639                 else { #normalize mime type
 640                         if (isset($this->mMimeTypeAliases[$extMime])) {
 641                                 $extMime= $this->mMimeTypeAliases[$extMime];
 642                         }
 643
 644                         $m= array($extMime);
 645                 }
 646
 647                 foreach ($m as $mime) {
 648                         foreach ($this->mMediaTypes as $type => $codes) {
 649                                 if (in_array($mime,$codes,true)) return $type;
 650                         }
 651                 }
 652
 653                 return MEDIATYPE_UNKNOWN;
 654         }
 655 }
 656
 657 ?>