includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 /**
   7  * Class to represent an image
   8  *
   9  * Provides methods to retrieve paths (physical, logical, URL),
  10  * to generate thumbnails or for uploading.
  11  * @package MediaWiki
  12  */
  13 class Image
  14 {
  15         /**#@+
  16          * @access private
  17          */
  18         var     $name,          # name of the image (constructor)
  19                 $imagePath,     # Path of the image (loadFromXxx)
  20                 $url,           # Image URL (accessor)
  21                 $title,         # Title object for this image (constructor)
  22                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  23                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  24                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  25                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  26                 $width,         # \
  27                 $height,        #  |
  28                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  29                 $type,          #  |
  30                 $attr,          # /
  31                 $size,          # Size in bytes (loadFromXxx)
  32                 $dataLoaded;    # Whether or not all this has been loaded from the database (loadFromXxx)
  33
  34
  35         /**#@-*/
  36
  37         /**
  38          * Create an Image object from an image name
  39          *
  40          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  41          * @access public
  42          */
  43         function newFromName( $name ) {
  44                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  45                 return new Image( $title );
  46         }
  47
  48         /**
  49          * Obsolete factory function, use constructor
  50          */
  51         function newFromTitle( $title ) {
  52                 return new Image( $title );
  53         }
  54
  55         function Image( $title ) {
  56                 $this->title =& $title;
  57                 $this->name = $title->getDBkey();
  58
  59                 $n = strrpos( $this->name, '.' );
  60                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  61                 $this->historyLine = 0;
  62
  63                 $this->dataLoaded = false;
  64         }
  65
  66         /**
  67          * Get the memcached keys
  68          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
  69          */
  70         function getCacheKeys( $shared = false ) {
  71                 global $wgDBname, $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
  72
  73                 $foundCached = false;
  74                 $hashedName = md5($this->name);
  75                 $keys = array( "$wgDBname:Image:$hashedName" );
  76                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
  77                         $keys[] = "$wgSharedUploadDBname:Image:$hashedName";
  78                 }
  79                 return $keys;
  80         }
  81
  82         /**
  83          * Try to load image metadata from memcached. Returns true on success.
  84          */
  85         function loadFromCache() {
  86                 global $wgUseSharedUploads, $wgMemc;
  87                 $fname = 'Image::loadFromMemcached';
  88                 wfProfileIn( $fname );
  89                 $this->dataLoaded = false;
  90                 $keys = $this->getCacheKeys();
  91                 $cachedValues = $wgMemc->get( $keys[0] );
  92
  93                 // Check if the key existed and belongs to this version of MediaWiki
  94                 if (!empty($cachedValues) && is_array($cachedValues) && isset($cachedValues['width']) && $cachedValues['fileExists']) {
  95                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
  96                                 # if this is shared file, we need to check if image
  97                                 # in shared repository has not changed
  98                                 if ( isset( $keys[1] ) ) {
  99                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 100                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues) && isset($commonsCachedValues['width'])) {
 101                                                 $this->name = $commonsCachedValues['name'];
 102                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 103                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 104                                                 $this->width = $commonsCachedValues['width'];
 105                                                 $this->height = $commonsCachedValues['height'];
 106                                                 $this->bits = $commonsCachedValues['bits'];
 107                                                 $this->type = $commonsCachedValues['type'];
 108                                                 $this->size = $commonsCachedValues['size'];
 109                                                 $this->fromSharedDirectory = true;
 110                                                 $this->dataLoaded = true;
 111                                                 $this->imagePath = $this->getFullPath(true);
 112                                         }
 113                                 }
 114                         }
 115                         else {
 116                                 $this->name = $cachedValues['name'];
 117                                 $this->imagePath = $cachedValues['imagePath'];
 118                                 $this->fileExists = $cachedValues['fileExists'];
 119                                 $this->width = $cachedValues['width'];
 120                                 $this->height = $cachedValues['height'];
 121                                 $this->bits = $cachedValues['bits'];
 122                                 $this->type = $cachedValues['type'];
 123                                 $this->size = $cachedValues['size'];
 124                                 $this->fromSharedDirectory = false;
 125                                 $this->dataLoaded = true;
 126                                 $this->imagePath = $this->getFullPath();
 127                         }
 128                 }
 129
 130                 wfProfileOut( $fname );
 131                 return $this->dataLoaded;
 132         }
 133
 134         /**
 135          * Save the image metadata to memcached
 136          */
 137         function saveToCache() {
 138                 global $wgMemc;
 139                 $this->load();
 140                 // We can't cache metadata for non-existent files, because if the file later appears
 141                 // in commons, the local keys won't be purged.
 142                 if ( $this->fileExists ) {
 143                         $keys = $this->getCacheKeys();
 144
 145                         $cachedValues = array('name' => $this->name,
 146                                                                   'imagePath' => $this->imagePath,
 147                                                                   'fileExists' => $this->fileExists,
 148                                                                   'fromShared' => $this->fromSharedDirectory,
 149                                                                   'width' => $this->width,
 150                                                                   'height' => $this->height,
 151                                                                   'bits' => $this->bits,
 152                                                                   'type' => $this->type,
 153                                                                   'size' => $this->size);
 154
 155                         $wgMemc->set( $keys[0], $cachedValues );
 156                 }
 157         }
 158
 159         /**
 160          * Load metadata from the file itself
 161          */
 162         function loadFromFile() {
 163                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgLang;
 164                 $fname = 'Image::loadFromFile';
 165                 wfProfileIn( $fname );
 166                 $this->imagePath = $this->getFullPath();
 167                 $this->fileExists = file_exists( $this->imagePath );
 168                 $this->fromSharedDirectory = false;
 169                 $gis = false;
 170
 171                 # If the file is not found, and a shared upload directory is used, look for it there.
 172                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 173                         # In case we're on a wgCapitalLinks=false wiki, we
 174                         # capitalize the first letter of the filename before
 175                         # looking it up in the shared repository.
 176                         $sharedImage = Image::newFromName( $wgLang->ucfirst($this->name) );
 177                         $this->fileExists = file_exists( $sharedImage->getFullPath(true) );
 178                         if ( $this->fileExists ) {
 179                                 $this->name = $sharedImage->name;
 180                                 $this->imagePath = $this->getFullPath(true);
 181                                 $this->fromSharedDirectory = true;
 182                         }
 183                 }
 184
 185                 if ( $this->fileExists ) {
 186                         # Get size in bytes
 187                         $this->size = filesize( $this->imagePath );
 188
 189                         # Height and width
 190                         # Don't try to get the width and height of sound and video files, that's bad for performance
 191                         if ( !Image::isKnownImageExtension( $this->extension ) ) {
 192                                 $gis = false;
 193                         } elseif( $this->extension == 'svg' ) {
 194                                 wfSuppressWarnings();
 195                                 $gis = wfGetSVGsize( $this->imagePath );
 196                                 wfRestoreWarnings();
 197                         } else {
 198                                 wfSuppressWarnings();
 199                                 $gis = getimagesize( $this->imagePath );
 200                                 wfRestoreWarnings();
 201                         }
 202                 }
 203                 if( $gis === false ) {
 204                         $this->width = 0;
 205                         $this->height = 0;
 206                         $this->bits = 0;
 207                         $this->type = 0;
 208                 } else {
 209                         $this->width = $gis[0];
 210                         $this->height = $gis[1];
 211                         $this->type = $gis[2];
 212                         if ( isset( $gis['bits'] ) )  {
 213                                 $this->bits = $gis['bits'];
 214                         } else {
 215                                 $this->bits = 0;
 216                         }
 217                 }
 218                 $this->dataLoaded = true;
 219                 wfProfileOut( $fname );
 220         }
 221
 222         /**
 223          * Load image metadata from the DB
 224          */
 225         function loadFromDB() {
 226                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgLang;
 227                 $fname = 'Image::loadFromDB';
 228                 wfProfileIn( $fname );
 229
 230                 $dbr =& wfGetDB( DB_SLAVE );
 231                 $row = $dbr->selectRow( 'image',
 232                         array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 233                         array( 'img_name' => $this->name ), $fname );
 234                 if ( $row ) {
 235                         $this->fromSharedDirectory = false;
 236                         $this->fileExists = true;
 237                         $this->loadFromRow( $row );
 238                         $this->imagePath = $this->getFullPath();
 239                         // Check for rows from a previous schema, quietly upgrade them
 240                         if ( $this->type == -1 ) {
 241                                 $this->upgradeRow();
 242                         }
 243                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 244                         # In case we're on a wgCapitalLinks=false wiki, we
 245                         # capitalize the first letter of the filename before
 246                         # looking it up in the shared repository.
 247                         $name = $wgLang->ucfirst($this->name);
 248
 249                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.image",
 250                                 array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 251                                 array( 'img_name' => $name ), $fname );
 252                         if ( $row ) {
 253                                 $this->fromSharedDirectory = true;
 254                                 $this->fileExists = true;
 255                                 $this->imagePath = $this->getFullPath(true);
 256                                 $this->name = $name;
 257                                 $this->loadFromRow( $row );
 258
 259                                 // Check for rows from a previous schema, quietly upgrade them
 260                                 if ( $this->type == -1 ) {
 261                                         $this->upgradeRow();
 262                                 }
 263                         }
 264                 }
 265
 266                 if ( !$row ) {
 267                         $this->size = 0;
 268                         $this->width = 0;
 269                         $this->height = 0;
 270                         $this->bits = 0;
 271                         $this->type = 0;
 272                         $this->fileExists = false;
 273                         $this->fromSharedDirectory = false;
 274                 }
 275
 276                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 277                 $this->dataLoaded = true;
 278         }
 279
 280         /*
 281          * Load image metadata from a DB result row
 282          */
 283         function loadFromRow( &$row ) {
 284                 $this->size = $row->img_size;
 285                 $this->width = $row->img_width;
 286                 $this->height = $row->img_height;
 287                 $this->bits = $row->img_bits;
 288                 $this->type = $row->img_type;
 289                 $this->dataLoaded = true;
 290         }
 291
 292         /**
 293          * Load image metadata from cache or DB, unless already loaded
 294          */
 295         function load() {
 296                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 297                 if ( !$this->dataLoaded ) {
 298                         if ( !$this->loadFromCache() ) {
 299                                 $this->loadFromDB();
 300                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 301                                         $this->loadFromFile();
 302                                 } elseif ( $this->fileExists ) {
 303                                         $this->saveToCache();
 304                                 }
 305                         }
 306                         $this->dataLoaded = true;
 307                 }
 308         }
 309
 310         /**
 311          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 312          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 313          */
 314         function upgradeRow() {
 315                 global $wgDBname, $wgSharedUploadDBname;
 316                 $fname = 'Image::upgradeRow';
 317                 $this->loadFromFile();
 318                 $dbw =& wfGetDB( DB_MASTER );
 319
 320                 if ( $this->fromSharedDirectory ) {
 321                         if ( !$wgSharedUploadDBname ) {
 322                                 return;
 323                         }
 324
 325                         // Write to the other DB using selectDB, not database selectors
 326                         // This avoids breaking replication in MySQL
 327                         $dbw->selectDB( $wgSharedUploadDBname );
 328                 }
 329                 $dbw->update( '`image`',
 330                         array(
 331                                 'img_width' => $this->width,
 332                                 'img_height' => $this->height,
 333                                 'img_bits' => $this->bits,
 334                                 'img_type' => $this->type,
 335                         ), array( 'img_name' => $this->name ), $fname
 336                 );
 337                 if ( $this->fromSharedDirectory ) {
 338                         $dbw->selectDB( $wgDBname );
 339                 }
 340         }
 341
 342         /**
 343          * Return the name of this image
 344          * @access public
 345          */
 346         function getName() {
 347                 return $this->name;
 348         }
 349
 350         /**
 351          * Return the associated title object
 352          * @access public
 353          */
 354         function getTitle() {
 355                 return $this->title;
 356         }
 357
 358         /**
 359          * Return the URL of the image file
 360          * @access public
 361          */
 362         function getURL() {
 363                 if ( !$this->url ) {
 364                         $this->load();
 365                         if($this->fileExists) {
 366                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 367                         } else {
 368                                 $this->url = '';
 369                         }
 370                 }
 371                 return $this->url;
 372         }
 373
 374         function getViewURL() {
 375                 if( $this->mustRender() ) {
 376                         return $this->createThumb( $this->getWidth() );
 377                 } else {
 378                         return $this->getURL();
 379                 }
 380         }
 381
 382         /**
 383          * Return the image path of the image in the
 384          * local file system as an absolute path
 385          * @access public
 386          */
 387         function getImagePath() {
 388                 $this->load();
 389                 return $this->imagePath;
 390         }
 391
 392         /**
 393          * Return the width of the image
 394          *
 395          * Returns -1 if the file specified is not a known image type
 396          * @access public
 397          */
 398         function getWidth() {
 399                 $this->load();
 400                 return $this->width;
 401         }
 402
 403         /**
 404          * Return the height of the image
 405          *
 406          * Returns -1 if the file specified is not a known image type
 407          * @access public
 408          */
 409         function getHeight() {
 410                 $this->load();
 411                 return $this->height;
 412         }
 413
 414         /**
 415          * Return the size of the image file, in bytes
 416          * @access public
 417          */
 418         function getSize() {
 419                 $this->load();
 420                 return $this->size;
 421         }
 422
 423         /**
 424          * Return the type of the image
 425          *
 426          * -  1 GIF
 427          * -  2 JPG
 428          * -  3 PNG
 429          * - 15 WBMP
 430          * - 16 XBM
 431          */
 432         function getType() {
 433                 $this->load();
 434                 return $this->type;
 435         }
 436
 437         /**
 438          * Return the escapeLocalURL of this image
 439          * @access public
 440          */
 441         function getEscapeLocalURL() {
 442                 $this->getTitle();
 443                 return $this->title->escapeLocalURL();
 444         }
 445
 446         /**
 447          * Return the escapeFullURL of this image
 448          * @access public
 449          */
 450         function getEscapeFullURL() {
 451                 $this->getTitle();
 452                 return $this->title->escapeFullURL();
 453         }
 454
 455         /**
 456          * Return the URL of an image, provided its name.
 457          *
 458          * @param string $name  Name of the image, without the leading "Image:"
 459          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 460          * @access public
 461          * @static
 462          */
 463         function imageUrl( $name, $fromSharedDirectory = false ) {
 464                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 465                 if($fromSharedDirectory) {
 466                         $base = '';
 467                         $path = $wgSharedUploadPath;
 468                 } else {
 469                         $base = $wgUploadBaseUrl;
 470                         $path = $wgUploadPath;
 471                 }
 472                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 473                 return wfUrlencode( $url );
 474         }
 475
 476         /**
 477          * Returns true if the image file exists on disk.
 478          *
 479          * @access public
 480          */
 481         function exists() {
 482                 $this->load();
 483                 return $this->fileExists;
 484         }
 485
 486         /**
 487          *
 488          * @access private
 489          */
 490         function thumbUrl( $width, $subdir='thumb') {
 491                 global $wgUploadPath, $wgUploadBaseUrl,
 492                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 493                            $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 494
 495                 // Generate thumb.php URL if possible
 496                 $script = false;
 497                 $url = false;
 498
 499                 if ( $this->fromSharedDirectory ) {
 500                         if ( $wgSharedThumbnailScriptPath ) {
 501                                 $script = $wgSharedThumbnailScriptPath;
 502                         }
 503                 } else {
 504                         if ( $wgThumbnailScriptPath ) {
 505                                 $script = $wgThumbnailScriptPath;
 506                         }
 507                 }
 508                 if ( $script ) {
 509                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 510                 } else {
 511                         $name = $this->thumbName( $width );
 512                         if($this->fromSharedDirectory) {
 513                                 $base = '';
 514                                 $path = $wgSharedUploadPath;
 515                         } else {
 516                                 $base = $wgUploadBaseUrl;
 517                                 $path = $wgUploadPath;
 518                         }
 519                         if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 520                                 $url = "{$base}{$path}/{$subdir}" .
 521                                 wfGetHashPath($this->name, $this->fromSharedDirectory)
 522                                 . $this->name.'/'.$name;
 523                                 $url = wfUrlencode( $url );
 524                         } else {
 525                                 $url = "{$base}{$path}/{$subdir}/{$name}";
 526                         }
 527                 }
 528                 return array( $script !== false, $url );
 529         }
 530
 531         /**
 532          * Return the file name of a thumbnail of the specified width
 533          *
 534          * @param integer $width        Width of the thumbnail image
 535          * @param boolean $shared       Does the thumbnail come from the shared repository?
 536          * @access private
 537          */
 538         function thumbName( $width ) {
 539                 $thumb = $width."px-".$this->name;
 540                 if( $this->extension == 'svg' ) {
 541                         # Rasterize SVG vector images to PNG
 542                         $thumb .= '.png';
 543                 }
 544                 return $thumb;
 545         }
 546
 547         /**
 548          * Create a thumbnail of the image having the specified width/height.
 549          * The thumbnail will not be created if the width is larger than the
 550          * image's width. Let the browser do the scaling in this case.
 551          * The thumbnail is stored on disk and is only computed if the thumbnail
 552          * file does not exist OR if it is older than the image.
 553          * Returns the URL.
 554          *
 555          * Keeps aspect ratio of original image. If both width and height are
 556          * specified, the generated image will be no bigger than width x height,
 557          * and will also have correct aspect ratio.
 558          *
 559          * @param integer $width        maximum width of the generated thumbnail
 560          * @param integer $height       maximum height of the image (optional)
 561          * @access public
 562          */
 563         function createThumb( $width, $height=-1 ) {
 564                 $thumb = $this->getThumbnail( $width, $height );
 565                 if( is_null( $thumb ) ) return '';
 566                 return $thumb->getUrl();
 567         }
 568
 569         /**
 570          * As createThumb, but returns a ThumbnailImage object. This can
 571          * provide access to the actual file, the real size of the thumb,
 572          * and can produce a convenient <img> tag for you.
 573          *
 574          * @param integer $width        maximum width of the generated thumbnail
 575          * @param integer $height       maximum height of the image (optional)
 576          * @return ThumbnailImage
 577          * @access public
 578          */
 579         function &getThumbnail( $width, $height=-1 ) {
 580                 if ( $height == -1 ) {
 581                         return $this->renderThumb( $width );
 582                 }
 583                 $this->load();
 584                 if ( $width < $this->width ) {
 585                         $thumbheight = $this->height * $width / $this->width;
 586                         $thumbwidth = $width;
 587                 } else {
 588                         $thumbheight = $this->height;
 589                         $thumbwidth = $this->width;
 590                 }
 591                 if ( $thumbheight > $height ) {
 592                         $thumbwidth = $thumbwidth * $height / $thumbheight;
 593                         $thumbheight = $height;
 594                 }
 595                 $thumb = $this->renderThumb( $thumbwidth );
 596                 if( is_null( $thumb ) ) {
 597                         $thumb = $this->iconThumb();
 598                 }
 599                 return $thumb;
 600         }
 601
 602         /**
 603          * @return ThumbnailImage
 604          */
 605         function iconThumb() {
 606                 global $wgStylePath, $wgStyleDirectory;
 607
 608                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 609                 foreach( $try as $icon ) {
 610                         $path = '/common/images/' . $icon;
 611                         $filepath = $wgStyleDirectory . $path;
 612                         if( file_exists( $filepath ) ) {
 613                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 614                         }
 615                 }
 616                 return null;
 617         }
 618
 619         /**
 620          * Create a thumbnail of the image having the specified width.
 621          * The thumbnail will not be created if the width is larger than the
 622          * image's width. Let the browser do the scaling in this case.
 623          * The thumbnail is stored on disk and is only computed if the thumbnail
 624          * file does not exist OR if it is older than the image.
 625          * Returns an object which can return the pathname, URL, and physical
 626          * pixel size of the thumbnail -- or null on failure.
 627          *
 628          * @return ThumbnailImage
 629          * @access private
 630          */
 631         function /* private */ renderThumb( $width, $useScript = true ) {
 632                 global $wgUseSquid, $wgInternalServer;
 633                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 634
 635                 $width = IntVal( $width );
 636
 637                 $this->load();
 638                 if ( ! $this->exists() )
 639                 {
 640                         # If there is no image, there will be no thumbnail
 641                         return null;
 642                 }
 643
 644                 # Sanity check $width
 645                 if( $width <= 0 ) {
 646                         # BZZZT
 647                         return null;
 648                 }
 649
 650                 if( $width > $this->width && !$this->mustRender() ) {
 651                         # Don't make an image bigger than the source
 652                         return new ThumbnailImage( $this->getViewURL(), $this->getWidth(), $this->getHeight() );
 653                 }
 654
 655                 $height = floor( $this->height * ( $width/$this->width ) );
 656
 657                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 658                 if ( $isScriptUrl && $useScript ) {
 659                         // Use thumb.php to render the image
 660                         return new ThumbnailImage( $url, $width, $height );
 661                 }
 662
 663                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 664                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 665
 666                 if ( !file_exists( $thumbPath ) ) {
 667                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 668                                 '/'.$thumbName;
 669                         $done = false;
 670                         if ( file_exists( $oldThumbPath ) ) {
 671                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 672                                         rename( $oldThumbPath, $thumbPath );
 673                                         $done = true;
 674                                 } else {
 675                                         unlink( $oldThumbPath );
 676                                 }
 677                         }
 678                         if ( !$done ) {
 679                                 $this->reallyRenderThumb( $thumbPath, $width, $height );
 680
 681                                 # Purge squid
 682                                 # This has to be done after the image is updated and present for all machines on NFS,
 683                                 # or else the old version might be stored into the squid again
 684                                 if ( $wgUseSquid ) {
 685                                         if ( substr( $url, 0, 4 ) == 'http' ) {
 686                                                 $urlArr = array( $url );
 687                                         } else {
 688                                                 $urlArr = array( $wgInternalServer.$url );
 689                                         }
 690                                         wfPurgeSquidServers($urlArr);
 691                                 }
 692                         }
 693                 }
 694                 return new ThumbnailImage( $url, $width, $height, $thumbPath );
 695         } // END OF function renderThumb
 696
 697         /**
 698          * Really render a thumbnail
 699          *
 700          * @access private
 701          */
 702         function /*private*/ reallyRenderThumb( $thumbPath, $width, $height ) {
 703                 global $wgSVGConverters, $wgSVGConverter,
 704                         $wgUseImageMagick, $wgImageMagickConvertCommand;
 705
 706                 $this->load();
 707
 708                 if( $this->extension == 'svg' ) {
 709                         global $wgSVGConverters, $wgSVGConverter;
 710                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 711                                 global $wgSVGConverterPath;
 712                                 $cmd = str_replace(
 713                                         array( '$path/', '$width', '$input', '$output' ),
 714                                         array( $wgSVGConverterPath,
 715                                                    $width,
 716                                                    escapeshellarg( $this->imagePath ),
 717                                                    escapeshellarg( $thumbPath ) ),
 718                                         $wgSVGConverters[$wgSVGConverter] );
 719                                 $conv = shell_exec( $cmd );
 720                         } else {
 721                                 $conv = false;
 722                         }
 723                 } elseif ( $wgUseImageMagick ) {
 724                         # use ImageMagick
 725                         # Specify white background color, will be used for transparent images
 726                         # in Internet Explorer/Windows instead of default black.
 727                         $cmd  =  $wgImageMagickConvertCommand .
 728                                 " -quality 85 -background white -geometry {$width} ".
 729                                 escapeshellarg($this->imagePath) . " " .
 730                                 escapeshellarg($thumbPath);
 731                         $conv = shell_exec( $cmd );
 732                 } else {
 733                         # Use PHP's builtin GD library functions.
 734                         #
 735                         # First find out what kind of file this is, and select the correct
 736                         # input routine for this.
 737
 738                         $truecolor = false;
 739
 740                         switch( $this->type ) {
 741                                 case 1: # GIF
 742                                         $src_image = imagecreatefromgif( $this->imagePath );
 743                                         break;
 744                                 case 2: # JPG
 745                                         $src_image = imagecreatefromjpeg( $this->imagePath );
 746                                         $truecolor = true;
 747                                         break;
 748                                 case 3: # PNG
 749                                         $src_image = imagecreatefrompng( $this->imagePath );
 750                                         $truecolor = ( $this->bits > 8 );
 751                                         break;
 752                                 case 15: # WBMP for WML
 753                                         $src_image = imagecreatefromwbmp( $this->imagePath );
 754                                         break;
 755                                 case 16: # XBM
 756                                         $src_image = imagecreatefromxbm( $this->imagePath );
 757                                         break;
 758                                 default:
 759                                         return 'Image type not supported';
 760                                         break;
 761                         }
 762                         if ( $truecolor ) {
 763                                 $dst_image = imagecreatetruecolor( $width, $height );
 764                         } else {
 765                                 $dst_image = imagecreate( $width, $height );
 766                         }
 767                         imagecopyresampled( $dst_image, $src_image,
 768                                                 0,0,0,0,
 769                                                 $width, $height, $this->width, $this->height );
 770                         switch( $this->type ) {
 771                                 case 1:  # GIF
 772                                 case 3:  # PNG
 773                                 case 15: # WBMP
 774                                 case 16: # XBM
 775                                         imagepng( $dst_image, $thumbPath );
 776                                         break;
 777                                 case 2:  # JPEG
 778                                         imageinterlace( $dst_image );
 779                                         imagejpeg( $dst_image, $thumbPath, 95 );
 780                                         break;
 781                                 default:
 782                                         break;
 783                         }
 784                         imagedestroy( $dst_image );
 785                         imagedestroy( $src_image );
 786                 }
 787                 #
 788                 # Check for zero-sized thumbnails. Those can be generated when
 789                 # no disk space is available or some other error occurs
 790                 #
 791                 if( file_exists( $thumbPath ) ) {
 792                         $thumbstat = stat( $thumbPath );
 793                         if( $thumbstat['size'] == 0 ) {
 794                                 unlink( $thumbPath );
 795                         }
 796                 }
 797         }
 798
 799         /**
 800          * Get all thumbnail names previously generated for this image
 801          */
 802         function getThumbnails( $shared = false ) {
 803                 if ( Image::isHashed( $shared ) ) {
 804                         $this->load();
 805                         $files = array();
 806                         $dir = wfImageThumbDir( $this->name, $shared );
 807
 808                         // This generates an error on failure, hence the @
 809                         $handle = @opendir( $dir );
 810
 811                         if ( $handle ) {
 812                                 while ( false !== ( $file = readdir($handle) ) ) {
 813                                         if ( $file{0} != '.' ) {
 814                                                 $files[] = $file;
 815                                         }
 816                                 }
 817                                 closedir( $handle );
 818                         }
 819                 } else {
 820                         $files = array();
 821                 }
 822
 823                 return $files;
 824         }
 825
 826         /**
 827          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
 828          */
 829         function purgeCache( $archiveFiles = array(), $shared = false ) {
 830                 global $wgInternalServer, $wgUseSquid;
 831
 832                 // Refresh metadata cache
 833                 clearstatcache();
 834                 $this->loadFromFile();
 835                 $this->saveToCache();
 836
 837                 // Delete thumbnails
 838                 $files = $this->getThumbnails( $shared );
 839                 $dir = wfImageThumbDir( $this->name, $shared );
 840                 $urls = array();
 841                 foreach ( $files as $file ) {
 842                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
 843                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
 844                                 @unlink( "$dir/$file" );
 845                         }
 846                 }
 847
 848                 // Purge the squid
 849                 if ( $wgUseSquid ) {
 850                         $urls[] = $wgInternalServer . $this->getViewURL();
 851                         foreach ( $archiveFiles as $file ) {
 852                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
 853                         }
 854                         wfPurgeSquidServers( $urls );
 855                 }
 856         }
 857
 858         /**
 859          * Return the image history of this image, line by line.
 860          * starts with current version, then old versions.
 861          * uses $this->historyLine to check which line to return:
 862          *  0      return line for current version
 863          *  1      query for old versions, return first one
 864          *  2, ... return next old version from above query
 865          *
 866          * @access public
 867          */
 868         function nextHistoryLine() {
 869                 $fname = 'Image::nextHistoryLine()';
 870                 $dbr =& wfGetDB( DB_SLAVE );
 871                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 872                         $this->historyRes = $dbr->select( 'image',
 873                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 874                                 array( 'img_name' => $this->title->getDBkey() ),
 875                                 $fname
 876                         );
 877                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 878                                 return FALSE;
 879                         }
 880                 } else if ( $this->historyLine == 1 ) {
 881                         $this->historyRes = $dbr->select( 'oldimage',
 882                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 883                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 884                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 885                         );
 886                 }
 887                 $this->historyLine ++;
 888
 889                 return $dbr->fetchObject( $this->historyRes );
 890         }
 891
 892         /**
 893          * Reset the history pointer to the first element of the history
 894          * @access public
 895          */
 896         function resetHistory() {
 897                 $this->historyLine = 0;
 898         }
 899
 900         /**
 901          * Return true if the file is of a type that can't be directly
 902          * rendered by typical browsers and needs to be re-rasterized.
 903          * @return bool
 904          */
 905         function mustRender() {
 906                 $this->load();
 907                 return ( $this->extension == 'svg' );
 908         }
 909
 910         /**
 911         * Return the full filesystem path to the file. Note that this does
 912         * not mean that a file actually exists under that location.
 913         *
 914         * This path depends on whether directory hashing is active or not,
 915         * i.e. whether the images are all found in the same directory,
 916         * or in hashed paths like /images/3/3c.
 917         *
 918         * @access public
 919         * @param boolean $fromSharedDirectory Return the path to the file
 920         *   in a shared repository (see $wgUseSharedRepository and related
 921         *   options in DefaultSettings.php) instead of a local one.
 922         *
 923         */
 924         function getFullPath( $fromSharedRepository = false ) {
 925                 global $wgUploadDirectory, $wgSharedUploadDirectory;
 926                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
 927
 928                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
 929                                                     $wgUploadDirectory;
 930
 931                 // $wgSharedUploadDirectory may be false, if thumb.php is used
 932                 if ( $dir ) {
 933                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
 934                 } else {
 935                         $fullpath = false;
 936                 }
 937
 938                 return $fullpath;
 939         }
 940
 941         /**
 942          * @return bool
 943          * @static
 944          */
 945         function isHashed( $shared ) {
 946                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
 947                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
 948         }
 949
 950         /**
 951          * @return bool
 952          * @static
 953          */
 954         function isKnownImageExtension( $ext ) {
 955                 static $extensions = array( 'svg', 'png', 'jpg', 'jpeg', 'gif', 'bmp', 'xbm' );
 956                 return in_array( $ext, $extensions );
 957         }
 958
 959         /**
 960          * Record an image upload in the upload log and the image table
 961          */
 962         function recordUpload( $oldver, $desc, $copyStatus = '', $source = '' ) {
 963                 global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 964                 global $wgUseCopyrightUpload, $wgUseSquid, $wgPostCommitUpdateList;
 965
 966                 $fname = 'Image::recordUpload';
 967                 $dbw =& wfGetDB( DB_MASTER );
 968
 969                 # img_name must be unique
 970                 if ( !$dbw->indexUnique( 'image', 'img_name' ) && !$dbw->indexExists('image','PRIMARY') ) {
 971                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
 972                 }
 973
 974                 // Delete thumbnails and refresh the metadata cache
 975                 $this->purgeCache();
 976
 977                 // Fail now if the image isn't there
 978                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
 979                         return false;
 980                 }
 981
 982                 if ( $wgUseCopyrightUpload ) {
 983                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 984                           '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 985                           '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 986                 } else {
 987                         $textdesc = $desc;
 988                 }
 989
 990                 $now = $dbw->timestamp();
 991
 992                 # Test to see if the row exists using INSERT IGNORE
 993                 # This avoids race conditions by locking the row until the commit, and also
 994                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
 995                 $dbw->insert( 'image',
 996                         array(
 997                                 'img_name' => $this->name,
 998                                 'img_size'=> $this->size,
 999                                 'img_width' => $this->width,
1000                                 'img_height' => $this->height,
1001                                 'img_bits' => $this->bits,
1002                                 'img_type' => $this->type,
1003                                 'img_timestamp' => $now,
1004                                 'img_description' => $desc,
1005                                 'img_user' => $wgUser->getID(),
1006                                 'img_user_text' => $wgUser->getName(),
1007                         ), $fname, 'IGNORE'
1008                 );
1009                 $descTitle = $this->getTitle();
1010                 $purgeURLs = array();
1011
1012                 if ( $dbw->affectedRows() ) {
1013                         # Successfully inserted, this is a new image
1014                         $id = $descTitle->getArticleID();
1015
1016                         if ( $id == 0 ) {
1017                                 $article = new Article( $descTitle );
1018                                 $article->insertNewArticle( $textdesc, $desc, false, false, true );
1019                         }
1020                 } else {
1021                         # Collision, this is an update of an image
1022                         # Insert previous contents into oldimage
1023                         $dbw->insertSelect( 'oldimage', 'image',
1024                                 array(
1025                                         'oi_name' => 'img_name',
1026                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1027                                         'oi_size' => 'img_size',
1028                                         'oi_width' => 'img_width',
1029                                         'oi_height' => 'img_height',
1030                                         'oi_bits' => 'img_bits',
1031                                         'oi_type' => 'img_type',
1032                                         'oi_timestamp' => 'img_timestamp',
1033                                         'oi_description' => 'img_description',
1034                                         'oi_user' => 'img_user',
1035                                         'oi_user_text' => 'img_user_text',
1036                                 ), array( 'img_name' => $this->name ), $fname
1037                         );
1038
1039                         # Update the current image row
1040                         $dbw->update( 'image',
1041                                 array( /* SET */
1042                                         'img_size' => $this->size,
1043                                         'img_width' => $this->width,
1044                                         'img_height' => $this->height,
1045                                         'img_bits' => $this->bits,
1046                                         'img_type' => $this->type,
1047                                         'img_timestamp' => $now,
1048                                         'img_user' => $wgUser->getID(),
1049                                         'img_user_text' => $wgUser->getName(),
1050                                         'img_description' => $desc,
1051                                 ), array( /* WHERE */
1052                                         'img_name' => $this->name
1053                                 ), $fname
1054                         );
1055
1056                         # Invalidate the cache for the description page
1057                         $descTitle->invalidateCache();
1058                         $purgeURLs[] = $descTitle->getInternalURL();
1059                 }
1060
1061                 # Invalidate cache for all pages using this image
1062                 $linksTo = $this->getLinksTo();
1063
1064                 if ( $wgUseSquid ) {
1065                         $u = SquidUpdate::newFromTitles( $linksTo, $purgeURLs );
1066                         array_push( $wgPostCommitUpdateList, $u );
1067                 }
1068                 Title::touchArray( $linksTo );
1069
1070                 $log = new LogPage( 'upload' );
1071                 $log->addEntry( 'upload', $descTitle, $desc );
1072
1073                 return true;
1074         }
1075
1076         /**
1077          * Get an array of Title objects which are articles which use this image
1078          * Also adds their IDs to the link cache
1079          *
1080          * This is mostly copied from Title::getLinksTo()
1081          */
1082         function getLinksTo( $options = '' ) {
1083                 global $wgLinkCache;
1084                 $fname = 'Image::getLinksTo';
1085                 wfProfileIn( $fname );
1086
1087                 if ( $options ) {
1088                         $db =& wfGetDB( DB_MASTER );
1089                 } else {
1090                         $db =& wfGetDB( DB_SLAVE );
1091                 }
1092
1093                 extract( $db->tableNames( 'page', 'imagelinks' ) );
1094                 $encName = $db->addQuotes( $this->name );
1095                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1096                 $res = $db->query( $sql, $fname );
1097
1098                 $retVal = array();
1099                 if ( $db->numRows( $res ) ) {
1100                         while ( $row = $db->fetchObject( $res ) ) {
1101                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1102                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1103                                         $retVal[] = $titleObj;
1104                                 }
1105                         }
1106                 }
1107                 $db->freeResult( $res );
1108                 return $retVal;
1109         }
1110
1111 } //class
1112
1113
1114 /**
1115  * Returns the image directory of an image
1116  * If the directory does not exist, it is created.
1117  * The result is an absolute path.
1118  *
1119  * This function is called from thumb.php before Setup.php is included
1120  *
1121  * @param string $fname         file name of the image file
1122  * @access public
1123  */
1124 function wfImageDir( $fname ) {
1125         global $wgUploadDirectory, $wgHashedUploadDirectory;
1126
1127         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1128
1129         $hash = md5( $fname );
1130         $oldumask = umask(0);
1131         $dest = $wgUploadDirectory . '/' . $hash{0};
1132         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1133         $dest .= '/' . substr( $hash, 0, 2 );
1134         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1135
1136         umask( $oldumask );
1137         return $dest;
1138 }
1139
1140 /**
1141  * Returns the image directory of an image's thubnail
1142  * If the directory does not exist, it is created.
1143  * The result is an absolute path.
1144  *
1145  * This function is called from thumb.php before Setup.php is included
1146  *
1147  * @param string $fname         file name of the original image file
1148  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1149  * @param boolean $shared       (optional) use the shared upload directory
1150  * @access public
1151  */
1152 function wfImageThumbDir( $fname, $shared = false ) {
1153         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1154         if ( Image::isHashed( $shared ) ) {
1155                 $dir =  "$base/$fname";
1156
1157                 if ( !is_dir( $base ) ) {
1158                         $oldumask = umask(0);
1159                         @mkdir( $base, 0777 );
1160                         umask( $oldumask );
1161                 }
1162
1163                 if ( ! is_dir( $dir ) ) {
1164                         $oldumask = umask(0);
1165                         @mkdir( $dir, 0777 );
1166                         umask( $oldumask );
1167                 }
1168         } else {
1169                 $dir = $base;
1170         }
1171
1172         return $dir;
1173 }
1174
1175 /**
1176  * Old thumbnail directory, kept for conversion
1177  */
1178 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1179         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1180 }
1181
1182 /**
1183  * Returns the image directory of an image's old version
1184  * If the directory does not exist, it is created.
1185  * The result is an absolute path.
1186  *
1187  * This function is called from thumb.php before Setup.php is included
1188  *
1189  * @param string $fname         file name of the thumbnail file, including file size prefix
1190  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1191  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1192  * @access public
1193  */
1194 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1195         global $wgUploadDirectory, $wgHashedUploadDirectory,
1196                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1197         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1198         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1199         if (!$hashdir) { return $dir.'/'.$subdir; }
1200         $hash = md5( $fname );
1201         $oldumask = umask(0);
1202
1203         # Suppress warning messages here; if the file itself can't
1204         # be written we'll worry about it then.
1205         wfSuppressWarnings();
1206
1207         $archive = $dir.'/'.$subdir;
1208         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1209         $archive .= '/' . $hash{0};
1210         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1211         $archive .= '/' . substr( $hash, 0, 2 );
1212         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1213
1214         wfRestoreWarnings();
1215         umask( $oldumask );
1216         return $archive;
1217 }
1218
1219
1220 /*
1221  * Return the hash path component of an image path (URL or filesystem),
1222  * e.g. "/3/3c/", or just "/" if hashing is not used.
1223  *
1224  * @param $dbkey The filesystem / database name of the file
1225  * @param $fromSharedDirectory Use the shared file repository? It may
1226  *   use different hash settings from the local one.
1227  */
1228 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1229         global $wgHashedSharedUploadDirectory, $wgSharedUploadDirectory;
1230         global $wgHashedUploadDirectory;
1231
1232         if( Image::isHashed( $fromSharedDirectory ) ) {
1233                 $hash = md5($dbkey);
1234                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1235         } else {
1236                 return '/';
1237         }
1238 }
1239
1240 /**
1241  * Returns the image URL of an image's old version
1242  *
1243  * @param string $fname         file name of the image file
1244  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1245  * @access public
1246  */
1247 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1248         global $wgUploadPath, $wgHashedUploadDirectory;
1249
1250         if ($wgHashedUploadDirectory) {
1251                 $hash = md5( substr( $name, 15) );
1252                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1253                   substr( $hash, 0, 2 ) . '/'.$name;
1254         } else {
1255                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1256         }
1257         return wfUrlencode($url);
1258 }
1259
1260 /**
1261  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1262  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1263  *
1264  * @param string $length
1265  * @return int Length in pixels
1266  */
1267 function wfScaleSVGUnit( $length ) {
1268         static $unitLength = array(
1269                 'px' => 1.0,
1270                 'pt' => 1.25,
1271                 'pc' => 15.0,
1272                 'mm' => 3.543307,
1273                 'cm' => 35.43307,
1274                 'in' => 90.0,
1275                 ''   => 1.0, // "User units" pixels by default
1276                 '%'  => 2.0, // Fake it!
1277                 );
1278         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1279                 $length = FloatVal( $matches[1] );
1280                 $unit = $matches[2];
1281                 return round( $length * $unitLength[$unit] );
1282         } else {
1283                 // Assume pixels
1284                 return round( FloatVal( $length ) );
1285         }
1286 }
1287
1288 /**
1289  * Compatible with PHP getimagesize()
1290  * @todo support gzipped SVGZ
1291  * @todo check XML more carefully
1292  * @todo sensible defaults
1293  *
1294  * @param string $filename
1295  * @return array
1296  */
1297 function wfGetSVGsize( $filename ) {
1298         $width = 256;
1299         $height = 256;
1300
1301         // Read a chunk of the file
1302         $f = fopen( $filename, "rt" );
1303         if( !$f ) return false;
1304         $chunk = fread( $f, 4096 );
1305         fclose( $f );
1306
1307         // Uber-crappy hack! Run through a real XML parser.
1308         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1309                 return false;
1310         }
1311         $tag = $matches[1];
1312         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1313                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1314         }
1315         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1316                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1317         }
1318
1319         return array( $width, $height, 'SVG',
1320                 "width=\"$width\" height=\"$height\"" );
1321 }
1322
1323 /**
1324  * Is an image on the bad image list?
1325  */
1326 function wfIsBadImage( $name ) {
1327         global $wgLang;
1328
1329         $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1330         foreach ( $lines as $line ) {
1331                 if ( preg_match( '/^\*\s*\[\[:(' . $wgLang->getNsText( NS_IMAGE ) . ':.*(?=]]))\]\]/', $line, $m ) ) {
1332                         $t = Title::newFromText( $m[1] );
1333                         if ( $t->getDBkey() == $name ) {
1334                                 return true;
1335                         }
1336                 }
1337         }
1338         return false;
1339 }
1340
1341
1342
1343 /**
1344  * Wrapper class for thumbnail images
1345  * @package MediaWiki
1346  */
1347 class ThumbnailImage {
1348         /**
1349          * @param string $path Filesystem path to the thumb
1350          * @param string $url URL path to the thumb
1351          * @access private
1352          */
1353         function ThumbnailImage( $url, $width, $height, $path = false ) {
1354                 $this->url = $url;
1355                 $this->width = $width;
1356                 $this->height = $height;
1357                 $this->path = $path;
1358         }
1359
1360         /**
1361          * @return string The thumbnail URL
1362          */
1363         function getUrl() {
1364                 return $this->url;
1365         }
1366
1367         /**
1368          * Return HTML <img ... /> tag for the thumbnail, will include
1369          * width and height attributes and a blank alt text (as required).
1370          *
1371          * You can set or override additional attributes by passing an
1372          * associative array of name => data pairs. The data will be escaped
1373          * for HTML output, so should be in plaintext.
1374          *
1375          * @param array $attribs
1376          * @return string
1377          * @access public
1378          */
1379         function toHtml( $attribs = array() ) {
1380                 $attribs['src'] = $this->url;
1381                 $attribs['width'] = $this->width;
1382                 $attribs['height'] = $this->height;
1383                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1384
1385                 $html = '<img ';
1386                 foreach( $attribs as $name => $data ) {
1387                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1388                 }
1389                 $html .= '/>';
1390                 return $html;
1391         }
1392
1393 }
1394 ?>