includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 if ( $wgShowEXIF ) {
   7         require_once ( 'exifReader.inc' ) ;
   8 }
   9
  10 /**
  11  * Class to represent an image
  12  *
  13  * Provides methods to retrieve paths (physical, logical, URL),
  14  * to generate thumbnails or for uploading.
  15  * @package MediaWiki
  16  */
  17 class Image
  18 {
  19         /**#@+
  20          * @access private
  21          */
  22         var     $name,          # name of the image (constructor)
  23                 $imagePath,     # Path of the image (loadFromXxx)
  24                 $url,           # Image URL (accessor)
  25                 $title,         # Title object for this image (constructor)
  26                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  27                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  28                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  29                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  30                 $width,         # \
  31                 $height,        #  |
  32                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  33                 $type,          #  |
  34                 $attr,          # /
  35                 $size,          # Size in bytes (loadFromXxx)
  36                 $dataLoaded;    # Whether or not all this has been loaded from the database (loadFromXxx)
  37
  38
  39         /**#@-*/
  40
  41         /**
  42          * Create an Image object from an image name
  43          *
  44          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  45          * @access public
  46          */
  47         function newFromName( $name ) {
  48                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  49                 return new Image( $title );
  50         }
  51
  52         /**
  53          * Obsolete factory function, use constructor
  54          */
  55         function newFromTitle( $title ) {
  56                 return new Image( $title );
  57         }
  58
  59         function Image( $title ) {
  60                 $this->title =& $title;
  61                 $this->name = $title->getDBkey();
  62
  63                 $n = strrpos( $this->name, '.' );
  64                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  65                 $this->historyLine = 0;
  66
  67                 $this->dataLoaded = false;
  68         }
  69
  70         /**
  71          * Get the memcached keys
  72          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
  73          */
  74         function getCacheKeys( $shared = false ) {
  75                 global $wgDBname, $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
  76
  77                 $foundCached = false;
  78                 $hashedName = md5($this->name);
  79                 $keys = array( "$wgDBname:Image:$hashedName" );
  80                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
  81                         $keys[] = "$wgSharedUploadDBname:Image:$hashedName";
  82                 }
  83                 return $keys;
  84         }
  85
  86         /**
  87          * Try to load image metadata from memcached. Returns true on success.
  88          */
  89         function loadFromCache() {
  90                 global $wgUseSharedUploads, $wgMemc;
  91                 $fname = 'Image::loadFromMemcached';
  92                 wfProfileIn( $fname );
  93                 $this->dataLoaded = false;
  94                 $keys = $this->getCacheKeys();
  95                 $cachedValues = $wgMemc->get( $keys[0] );
  96
  97                 // Check if the key existed and belongs to this version of MediaWiki
  98                 if (!empty($cachedValues) && is_array($cachedValues) && isset($cachedValues['width']) && $cachedValues['fileExists']) {
  99                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
 100                                 # if this is shared file, we need to check if image
 101                                 # in shared repository has not changed
 102                                 if ( isset( $keys[1] ) ) {
 103                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 104                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues) && isset($commonsCachedValues['width'])) {
 105                                                 $this->name = $commonsCachedValues['name'];
 106                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 107                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 108                                                 $this->width = $commonsCachedValues['width'];
 109                                                 $this->height = $commonsCachedValues['height'];
 110                                                 $this->bits = $commonsCachedValues['bits'];
 111                                                 $this->type = $commonsCachedValues['type'];
 112                                                 $this->size = $commonsCachedValues['size'];
 113                                                 $this->fromSharedDirectory = true;
 114                                                 $this->dataLoaded = true;
 115                                                 $this->imagePath = $this->getFullPath(true);
 116                                         }
 117                                 }
 118                         }
 119                         else {
 120                                 $this->name = $cachedValues['name'];
 121                                 $this->imagePath = $cachedValues['imagePath'];
 122                                 $this->fileExists = $cachedValues['fileExists'];
 123                                 $this->width = $cachedValues['width'];
 124                                 $this->height = $cachedValues['height'];
 125                                 $this->bits = $cachedValues['bits'];
 126                                 $this->type = $cachedValues['type'];
 127                                 $this->size = $cachedValues['size'];
 128                                 $this->fromSharedDirectory = false;
 129                                 $this->dataLoaded = true;
 130                                 $this->imagePath = $this->getFullPath();
 131                         }
 132                 }
 133
 134                 wfProfileOut( $fname );
 135                 return $this->dataLoaded;
 136         }
 137
 138         /**
 139          * Save the image metadata to memcached
 140          */
 141         function saveToCache() {
 142                 global $wgMemc;
 143                 $this->load();
 144                 // We can't cache metadata for non-existent files, because if the file later appears
 145                 // in commons, the local keys won't be purged.
 146                 if ( $this->fileExists ) {
 147                         $keys = $this->getCacheKeys();
 148
 149                         $cachedValues = array('name' => $this->name,
 150                                                                   'imagePath' => $this->imagePath,
 151                                                                   'fileExists' => $this->fileExists,
 152                                                                   'fromShared' => $this->fromSharedDirectory,
 153                                                                   'width' => $this->width,
 154                                                                   'height' => $this->height,
 155                                                                   'bits' => $this->bits,
 156                                                                   'type' => $this->type,
 157                                                                   'size' => $this->size);
 158
 159                         $wgMemc->set( $keys[0], $cachedValues );
 160                 }
 161         }
 162
 163         /**
 164          * Load metadata from the file itself
 165          */
 166         function loadFromFile() {
 167                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgLang;
 168                 $fname = 'Image::loadFromFile';
 169                 wfProfileIn( $fname );
 170                 $this->imagePath = $this->getFullPath();
 171                 $this->fileExists = file_exists( $this->imagePath );
 172                 $this->fromSharedDirectory = false;
 173                 $gis = false;
 174
 175                 # If the file is not found, and a shared upload directory is used, look for it there.
 176                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 177                         # In case we're on a wgCapitalLinks=false wiki, we
 178                         # capitalize the first letter of the filename before
 179                         # looking it up in the shared repository.
 180                         $sharedImage = Image::newFromName( $wgLang->ucfirst($this->name) );
 181                         $this->fileExists = file_exists( $sharedImage->getFullPath(true) );
 182                         if ( $this->fileExists ) {
 183                                 $this->name = $sharedImage->name;
 184                                 $this->imagePath = $this->getFullPath(true);
 185                                 $this->fromSharedDirectory = true;
 186                         }
 187                 }
 188
 189                 if ( $this->fileExists ) {
 190                         # Get size in bytes
 191                         $this->size = filesize( $this->imagePath );
 192
 193                         # Height and width
 194                         # Don't try to get the width and height of sound and video files, that's bad for performance
 195                         if ( !Image::isKnownImageExtension( $this->extension ) ) {
 196                                 $gis = false;
 197                         } elseif( $this->extension == 'svg' ) {
 198                                 wfSuppressWarnings();
 199                                 $gis = wfGetSVGsize( $this->imagePath );
 200                                 wfRestoreWarnings();
 201                         } else {
 202                                 wfSuppressWarnings();
 203                                 $gis = getimagesize( $this->imagePath );
 204                                 wfRestoreWarnings();
 205                         }
 206                 }
 207                 if( $gis === false ) {
 208                         $this->width = 0;
 209                         $this->height = 0;
 210                         $this->bits = 0;
 211                         $this->type = 0;
 212                 } else {
 213                         $this->width = $gis[0];
 214                         $this->height = $gis[1];
 215                         $this->type = $gis[2];
 216                         if ( isset( $gis['bits'] ) )  {
 217                                 $this->bits = $gis['bits'];
 218                         } else {
 219                                 $this->bits = 0;
 220                         }
 221                 }
 222                 $this->dataLoaded = true;
 223                 wfProfileOut( $fname );
 224         }
 225
 226         /**
 227          * Load image metadata from the DB
 228          */
 229         function loadFromDB() {
 230                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgLang;
 231                 $fname = 'Image::loadFromDB';
 232                 wfProfileIn( $fname );
 233
 234                 $dbr =& wfGetDB( DB_SLAVE );
 235                 $row = $dbr->selectRow( 'image',
 236                         array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 237                         array( 'img_name' => $this->name ), $fname );
 238                 if ( $row ) {
 239                         $this->fromSharedDirectory = false;
 240                         $this->fileExists = true;
 241                         $this->loadFromRow( $row );
 242                         $this->imagePath = $this->getFullPath();
 243                         // Check for rows from a previous schema, quietly upgrade them
 244                         if ( $this->type == -1 ) {
 245                                 $this->upgradeRow();
 246                         }
 247                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 248                         # In case we're on a wgCapitalLinks=false wiki, we
 249                         # capitalize the first letter of the filename before
 250                         # looking it up in the shared repository.
 251                         $name = $wgLang->ucfirst($this->name);
 252
 253                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.image",
 254                                 array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 255                                 array( 'img_name' => $name ), $fname );
 256                         if ( $row ) {
 257                                 $this->fromSharedDirectory = true;
 258                                 $this->fileExists = true;
 259                                 $this->imagePath = $this->getFullPath(true);
 260                                 $this->name = $name;
 261                                 $this->loadFromRow( $row );
 262
 263                                 // Check for rows from a previous schema, quietly upgrade them
 264                                 if ( $this->type == -1 ) {
 265                                         $this->upgradeRow();
 266                                 }
 267                         }
 268                 }
 269
 270                 if ( !$row ) {
 271                         $this->size = 0;
 272                         $this->width = 0;
 273                         $this->height = 0;
 274                         $this->bits = 0;
 275                         $this->type = 0;
 276                         $this->fileExists = false;
 277                         $this->fromSharedDirectory = false;
 278                 }
 279
 280                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 281                 $this->dataLoaded = true;
 282         }
 283
 284         /*
 285          * Load image metadata from a DB result row
 286          */
 287         function loadFromRow( &$row ) {
 288                 $this->size = $row->img_size;
 289                 $this->width = $row->img_width;
 290                 $this->height = $row->img_height;
 291                 $this->bits = $row->img_bits;
 292                 $this->type = $row->img_type;
 293                 $this->dataLoaded = true;
 294         }
 295
 296         /**
 297          * Load image metadata from cache or DB, unless already loaded
 298          */
 299         function load() {
 300                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 301                 if ( !$this->dataLoaded ) {
 302                         if ( !$this->loadFromCache() ) {
 303                                 $this->loadFromDB();
 304                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 305                                         $this->loadFromFile();
 306                                 } elseif ( $this->fileExists ) {
 307                                         $this->saveToCache();
 308                                 }
 309                         }
 310                         $this->dataLoaded = true;
 311                 }
 312         }
 313
 314         /**
 315          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 316          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 317          */
 318         function upgradeRow() {
 319                 global $wgDBname, $wgSharedUploadDBname;
 320                 $fname = 'Image::upgradeRow';
 321                 $this->loadFromFile();
 322                 $dbw =& wfGetDB( DB_MASTER );
 323
 324                 if ( $this->fromSharedDirectory ) {
 325                         if ( !$wgSharedUploadDBname ) {
 326                                 return;
 327                         }
 328
 329                         // Write to the other DB using selectDB, not database selectors
 330                         // This avoids breaking replication in MySQL
 331                         $dbw->selectDB( $wgSharedUploadDBname );
 332                 }
 333                 $dbw->update( '`image`',
 334                         array(
 335                                 'img_width' => $this->width,
 336                                 'img_height' => $this->height,
 337                                 'img_bits' => $this->bits,
 338                                 'img_type' => $this->type,
 339                         ), array( 'img_name' => $this->name ), $fname
 340                 );
 341                 if ( $this->fromSharedDirectory ) {
 342                         $dbw->selectDB( $wgDBname );
 343                 }
 344         }
 345
 346         /**
 347          * Return the name of this image
 348          * @access public
 349          */
 350         function getName() {
 351                 return $this->name;
 352         }
 353
 354         /**
 355          * Return the associated title object
 356          * @access public
 357          */
 358         function getTitle() {
 359                 return $this->title;
 360         }
 361
 362         /**
 363          * Return the URL of the image file
 364          * @access public
 365          */
 366         function getURL() {
 367                 if ( !$this->url ) {
 368                         $this->load();
 369                         if($this->fileExists) {
 370                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 371                         } else {
 372                                 $this->url = '';
 373                         }
 374                 }
 375                 return $this->url;
 376         }
 377
 378         function getViewURL() {
 379                 if( $this->mustRender() ) {
 380                         return $this->createThumb( $this->getWidth() );
 381                 } else {
 382                         return $this->getURL();
 383                 }
 384         }
 385
 386         /**
 387          * Return the image path of the image in the
 388          * local file system as an absolute path
 389          * @access public
 390          */
 391         function getImagePath() {
 392                 $this->load();
 393                 return $this->imagePath;
 394         }
 395
 396         /**
 397          * Return the width of the image
 398          *
 399          * Returns -1 if the file specified is not a known image type
 400          * @access public
 401          */
 402         function getWidth() {
 403                 $this->load();
 404                 return $this->width;
 405         }
 406
 407         /**
 408          * Return the height of the image
 409          *
 410          * Returns -1 if the file specified is not a known image type
 411          * @access public
 412          */
 413         function getHeight() {
 414                 $this->load();
 415                 return $this->height;
 416         }
 417
 418         /**
 419          * Return the size of the image file, in bytes
 420          * @access public
 421          */
 422         function getSize() {
 423                 $this->load();
 424                 return $this->size;
 425         }
 426
 427         /**
 428          * Return the type of the image
 429          *
 430          * -  1 GIF
 431          * -  2 JPG
 432          * -  3 PNG
 433          * - 15 WBMP
 434          * - 16 XBM
 435          */
 436         function getType() {
 437                 $this->load();
 438                 return $this->type;
 439         }
 440
 441         /**
 442          * Return the escapeLocalURL of this image
 443          * @access public
 444          */
 445         function getEscapeLocalURL() {
 446                 $this->getTitle();
 447                 return $this->title->escapeLocalURL();
 448         }
 449
 450         /**
 451          * Return the escapeFullURL of this image
 452          * @access public
 453          */
 454         function getEscapeFullURL() {
 455                 $this->getTitle();
 456                 return $this->title->escapeFullURL();
 457         }
 458
 459         /**
 460          * Return the URL of an image, provided its name.
 461          *
 462          * @param string $name  Name of the image, without the leading "Image:"
 463          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 464          * @access public
 465          * @static
 466          */
 467         function imageUrl( $name, $fromSharedDirectory = false ) {
 468                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 469                 if($fromSharedDirectory) {
 470                         $base = '';
 471                         $path = $wgSharedUploadPath;
 472                 } else {
 473                         $base = $wgUploadBaseUrl;
 474                         $path = $wgUploadPath;
 475                 }
 476                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 477                 return wfUrlencode( $url );
 478         }
 479
 480         /**
 481          * Returns true if the image file exists on disk.
 482          *
 483          * @access public
 484          */
 485         function exists() {
 486                 $this->load();
 487                 return $this->fileExists;
 488         }
 489
 490         /**
 491          *
 492          * @access private
 493          */
 494         function thumbUrl( $width, $subdir='thumb') {
 495                 global $wgUploadPath, $wgUploadBaseUrl,
 496                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 497                            $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 498
 499                 // Generate thumb.php URL if possible
 500                 $script = false;
 501                 $url = false;
 502
 503                 if ( $this->fromSharedDirectory ) {
 504                         if ( $wgSharedThumbnailScriptPath ) {
 505                                 $script = $wgSharedThumbnailScriptPath;
 506                         }
 507                 } else {
 508                         if ( $wgThumbnailScriptPath ) {
 509                                 $script = $wgThumbnailScriptPath;
 510                         }
 511                 }
 512                 if ( $script ) {
 513                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 514                 } else {
 515                         $name = $this->thumbName( $width );
 516                         if($this->fromSharedDirectory) {
 517                                 $base = '';
 518                                 $path = $wgSharedUploadPath;
 519                         } else {
 520                                 $base = $wgUploadBaseUrl;
 521                                 $path = $wgUploadPath;
 522                         }
 523                         if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 524                                 $url = "{$base}{$path}/{$subdir}" .
 525                                 wfGetHashPath($this->name, $this->fromSharedDirectory)
 526                                 . $this->name.'/'.$name;
 527                                 $url = wfUrlencode( $url );
 528                         } else {
 529                                 $url = "{$base}{$path}/{$subdir}/{$name}";
 530                         }
 531                 }
 532                 return array( $script !== false, $url );
 533         }
 534
 535         /**
 536          * Return the file name of a thumbnail of the specified width
 537          *
 538          * @param integer $width        Width of the thumbnail image
 539          * @param boolean $shared       Does the thumbnail come from the shared repository?
 540          * @access private
 541          */
 542         function thumbName( $width ) {
 543                 $thumb = $width."px-".$this->name;
 544                 if( $this->extension == 'svg' ) {
 545                         # Rasterize SVG vector images to PNG
 546                         $thumb .= '.png';
 547                 }
 548                 return $thumb;
 549         }
 550
 551         /**
 552          * Create a thumbnail of the image having the specified width/height.
 553          * The thumbnail will not be created if the width is larger than the
 554          * image's width. Let the browser do the scaling in this case.
 555          * The thumbnail is stored on disk and is only computed if the thumbnail
 556          * file does not exist OR if it is older than the image.
 557          * Returns the URL.
 558          *
 559          * Keeps aspect ratio of original image. If both width and height are
 560          * specified, the generated image will be no bigger than width x height,
 561          * and will also have correct aspect ratio.
 562          *
 563          * @param integer $width        maximum width of the generated thumbnail
 564          * @param integer $height       maximum height of the image (optional)
 565          * @access public
 566          */
 567         function createThumb( $width, $height=-1 ) {
 568                 $thumb = $this->getThumbnail( $width, $height );
 569                 if( is_null( $thumb ) ) return '';
 570                 return $thumb->getUrl();
 571         }
 572
 573         /**
 574          * As createThumb, but returns a ThumbnailImage object. This can
 575          * provide access to the actual file, the real size of the thumb,
 576          * and can produce a convenient <img> tag for you.
 577          *
 578          * @param integer $width        maximum width of the generated thumbnail
 579          * @param integer $height       maximum height of the image (optional)
 580          * @return ThumbnailImage
 581          * @access public
 582          */
 583         function &getThumbnail( $width, $height=-1 ) {
 584                 if ( $height == -1 ) {
 585                         return $this->renderThumb( $width );
 586                 }
 587                 $this->load();
 588                 if ( $width < $this->width ) {
 589                         $thumbheight = $this->height * $width / $this->width;
 590                         $thumbwidth = $width;
 591                 } else {
 592                         $thumbheight = $this->height;
 593                         $thumbwidth = $this->width;
 594                 }
 595                 if ( $thumbheight > $height ) {
 596                         $thumbwidth = $thumbwidth * $height / $thumbheight;
 597                         $thumbheight = $height;
 598                 }
 599                 $thumb = $this->renderThumb( $thumbwidth );
 600                 if( is_null( $thumb ) ) {
 601                         $thumb = $this->iconThumb();
 602                 }
 603                 return $thumb;
 604         }
 605
 606         /**
 607          * @return ThumbnailImage
 608          */
 609         function iconThumb() {
 610                 global $wgStylePath, $wgStyleDirectory;
 611
 612                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 613                 foreach( $try as $icon ) {
 614                         $path = '/common/images/' . $icon;
 615                         $filepath = $wgStyleDirectory . $path;
 616                         if( file_exists( $filepath ) ) {
 617                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 618                         }
 619                 }
 620                 return null;
 621         }
 622
 623         /**
 624          * Create a thumbnail of the image having the specified width.
 625          * The thumbnail will not be created if the width is larger than the
 626          * image's width. Let the browser do the scaling in this case.
 627          * The thumbnail is stored on disk and is only computed if the thumbnail
 628          * file does not exist OR if it is older than the image.
 629          * Returns an object which can return the pathname, URL, and physical
 630          * pixel size of the thumbnail -- or null on failure.
 631          *
 632          * @return ThumbnailImage
 633          * @access private
 634          */
 635         function /* private */ renderThumb( $width, $useScript = true ) {
 636                 global $wgUseSquid, $wgInternalServer;
 637                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 638
 639                 $width = IntVal( $width );
 640
 641                 $this->load();
 642                 if ( ! $this->exists() )
 643                 {
 644                         # If there is no image, there will be no thumbnail
 645                         return null;
 646                 }
 647
 648                 # Sanity check $width
 649                 if( $width <= 0 ) {
 650                         # BZZZT
 651                         return null;
 652                 }
 653
 654                 if( $width > $this->width && !$this->mustRender() ) {
 655                         # Don't make an image bigger than the source
 656                         return new ThumbnailImage( $this->getViewURL(), $this->getWidth(), $this->getHeight() );
 657                 }
 658
 659                 $height = floor( $this->height * ( $width/$this->width ) );
 660
 661                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 662                 if ( $isScriptUrl && $useScript ) {
 663                         // Use thumb.php to render the image
 664                         return new ThumbnailImage( $url, $width, $height );
 665                 }
 666
 667                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 668                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 669
 670                 if ( !file_exists( $thumbPath ) ) {
 671                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 672                                 '/'.$thumbName;
 673                         $done = false;
 674                         if ( file_exists( $oldThumbPath ) ) {
 675                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 676                                         rename( $oldThumbPath, $thumbPath );
 677                                         $done = true;
 678                                 } else {
 679                                         unlink( $oldThumbPath );
 680                                 }
 681                         }
 682                         if ( !$done ) {
 683                                 $this->reallyRenderThumb( $thumbPath, $width, $height );
 684
 685                                 # Purge squid
 686                                 # This has to be done after the image is updated and present for all machines on NFS,
 687                                 # or else the old version might be stored into the squid again
 688                                 if ( $wgUseSquid ) {
 689                                         if ( substr( $url, 0, 4 ) == 'http' ) {
 690                                                 $urlArr = array( $url );
 691                                         } else {
 692                                                 $urlArr = array( $wgInternalServer.$url );
 693                                         }
 694                                         wfPurgeSquidServers($urlArr);
 695                                 }
 696                         }
 697                 }
 698                 return new ThumbnailImage( $url, $width, $height, $thumbPath );
 699         } // END OF function renderThumb
 700
 701         /**
 702          * Really render a thumbnail
 703          *
 704          * @access private
 705          */
 706         function /*private*/ reallyRenderThumb( $thumbPath, $width, $height ) {
 707                 global $wgSVGConverters, $wgSVGConverter,
 708                         $wgUseImageMagick, $wgImageMagickConvertCommand;
 709
 710                 $this->load();
 711
 712                 if( $this->extension == 'svg' ) {
 713                         global $wgSVGConverters, $wgSVGConverter;
 714                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 715                                 global $wgSVGConverterPath;
 716                                 $cmd = str_replace(
 717                                         array( '$path/', '$width', '$input', '$output' ),
 718                                         array( $wgSVGConverterPath,
 719                                                    $width,
 720                                                    escapeshellarg( $this->imagePath ),
 721                                                    escapeshellarg( $thumbPath ) ),
 722                                         $wgSVGConverters[$wgSVGConverter] );
 723                                 $conv = shell_exec( $cmd );
 724                         } else {
 725                                 $conv = false;
 726                         }
 727                 } elseif ( $wgUseImageMagick ) {
 728                         # use ImageMagick
 729                         # Specify white background color, will be used for transparent images
 730                         # in Internet Explorer/Windows instead of default black.
 731                         $cmd  =  $wgImageMagickConvertCommand .
 732                                 " -quality 85 -background white -geometry {$width} ".
 733                                 escapeshellarg($this->imagePath) . " " .
 734                                 escapeshellarg($thumbPath);
 735                         $conv = shell_exec( $cmd );
 736                 } else {
 737                         # Use PHP's builtin GD library functions.
 738                         #
 739                         # First find out what kind of file this is, and select the correct
 740                         # input routine for this.
 741
 742                         $truecolor = false;
 743
 744                         switch( $this->type ) {
 745                                 case 1: # GIF
 746                                         $src_image = imagecreatefromgif( $this->imagePath );
 747                                         break;
 748                                 case 2: # JPG
 749                                         $src_image = imagecreatefromjpeg( $this->imagePath );
 750                                         $truecolor = true;
 751                                         break;
 752                                 case 3: # PNG
 753                                         $src_image = imagecreatefrompng( $this->imagePath );
 754                                         $truecolor = ( $this->bits > 8 );
 755                                         break;
 756                                 case 15: # WBMP for WML
 757                                         $src_image = imagecreatefromwbmp( $this->imagePath );
 758                                         break;
 759                                 case 16: # XBM
 760                                         $src_image = imagecreatefromxbm( $this->imagePath );
 761                                         break;
 762                                 default:
 763                                         return 'Image type not supported';
 764                                         break;
 765                         }
 766                         if ( $truecolor ) {
 767                                 $dst_image = imagecreatetruecolor( $width, $height );
 768                         } else {
 769                                 $dst_image = imagecreate( $width, $height );
 770                         }
 771                         imagecopyresampled( $dst_image, $src_image,
 772                                                 0,0,0,0,
 773                                                 $width, $height, $this->width, $this->height );
 774                         switch( $this->type ) {
 775                                 case 1:  # GIF
 776                                 case 3:  # PNG
 777                                 case 15: # WBMP
 778                                 case 16: # XBM
 779                                         imagepng( $dst_image, $thumbPath );
 780                                         break;
 781                                 case 2:  # JPEG
 782                                         imageinterlace( $dst_image );
 783                                         imagejpeg( $dst_image, $thumbPath, 95 );
 784                                         break;
 785                                 default:
 786                                         break;
 787                         }
 788                         imagedestroy( $dst_image );
 789                         imagedestroy( $src_image );
 790                 }
 791                 #
 792                 # Check for zero-sized thumbnails. Those can be generated when
 793                 # no disk space is available or some other error occurs
 794                 #
 795                 if( file_exists( $thumbPath ) ) {
 796                         $thumbstat = stat( $thumbPath );
 797                         if( $thumbstat['size'] == 0 ) {
 798                                 unlink( $thumbPath );
 799                         }
 800                 }
 801         }
 802
 803         /**
 804          * Get all thumbnail names previously generated for this image
 805          */
 806         function getThumbnails( $shared = false ) {
 807                 if ( Image::isHashed( $shared ) ) {
 808                         $this->load();
 809                         $files = array();
 810                         $dir = wfImageThumbDir( $this->name, $shared );
 811
 812                         // This generates an error on failure, hence the @
 813                         $handle = @opendir( $dir );
 814
 815                         if ( $handle ) {
 816                                 while ( false !== ( $file = readdir($handle) ) ) {
 817                                         if ( $file{0} != '.' ) {
 818                                                 $files[] = $file;
 819                                         }
 820                                 }
 821                                 closedir( $handle );
 822                         }
 823                 } else {
 824                         $files = array();
 825                 }
 826
 827                 return $files;
 828         }
 829
 830         /**
 831          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
 832          */
 833         function purgeCache( $archiveFiles = array(), $shared = false ) {
 834                 global $wgInternalServer, $wgUseSquid;
 835
 836                 // Refresh metadata cache
 837                 clearstatcache();
 838                 $this->loadFromFile();
 839                 $this->saveToCache();
 840
 841                 // Delete thumbnails
 842                 $files = $this->getThumbnails( $shared );
 843                 $dir = wfImageThumbDir( $this->name, $shared );
 844                 $urls = array();
 845                 foreach ( $files as $file ) {
 846                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
 847                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
 848                                 @unlink( "$dir/$file" );
 849                         }
 850                 }
 851
 852                 // Purge the squid
 853                 if ( $wgUseSquid ) {
 854                         $urls[] = $wgInternalServer . $this->getViewURL();
 855                         foreach ( $archiveFiles as $file ) {
 856                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
 857                         }
 858                         wfPurgeSquidServers( $urls );
 859                 }
 860         }
 861
 862         /**
 863          * Return the image history of this image, line by line.
 864          * starts with current version, then old versions.
 865          * uses $this->historyLine to check which line to return:
 866          *  0      return line for current version
 867          *  1      query for old versions, return first one
 868          *  2, ... return next old version from above query
 869          *
 870          * @access public
 871          */
 872         function nextHistoryLine() {
 873                 $fname = 'Image::nextHistoryLine()';
 874                 $dbr =& wfGetDB( DB_SLAVE );
 875                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 876                         $this->historyRes = $dbr->select( 'image',
 877                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 878                                 array( 'img_name' => $this->title->getDBkey() ),
 879                                 $fname
 880                         );
 881                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 882                                 return FALSE;
 883                         }
 884                 } else if ( $this->historyLine == 1 ) {
 885                         $this->historyRes = $dbr->select( 'oldimage',
 886                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 887                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 888                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 889                         );
 890                 }
 891                 $this->historyLine ++;
 892
 893                 return $dbr->fetchObject( $this->historyRes );
 894         }
 895
 896         /**
 897          * Reset the history pointer to the first element of the history
 898          * @access public
 899          */
 900         function resetHistory() {
 901                 $this->historyLine = 0;
 902         }
 903
 904         /**
 905          * Return true if the file is of a type that can't be directly
 906          * rendered by typical browsers and needs to be re-rasterized.
 907          * @return bool
 908          */
 909         function mustRender() {
 910                 $this->load();
 911                 return ( $this->extension == 'svg' );
 912         }
 913
 914         /**
 915         * Return the full filesystem path to the file. Note that this does
 916         * not mean that a file actually exists under that location.
 917         *
 918         * This path depends on whether directory hashing is active or not,
 919         * i.e. whether the images are all found in the same directory,
 920         * or in hashed paths like /images/3/3c.
 921         *
 922         * @access public
 923         * @param boolean $fromSharedDirectory Return the path to the file
 924         *   in a shared repository (see $wgUseSharedRepository and related
 925         *   options in DefaultSettings.php) instead of a local one.
 926         *
 927         */
 928         function getFullPath( $fromSharedRepository = false ) {
 929                 global $wgUploadDirectory, $wgSharedUploadDirectory;
 930                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
 931
 932                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
 933                                                     $wgUploadDirectory;
 934
 935                 // $wgSharedUploadDirectory may be false, if thumb.php is used
 936                 if ( $dir ) {
 937                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
 938                 } else {
 939                         $fullpath = false;
 940                 }
 941
 942                 return $fullpath;
 943         }
 944
 945         /**
 946          * @return bool
 947          * @static
 948          */
 949         function isHashed( $shared ) {
 950                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
 951                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
 952         }
 953
 954         /**
 955          * @return bool
 956          * @static
 957          */
 958         function isKnownImageExtension( $ext ) {
 959                 static $extensions = array( 'svg', 'png', 'jpg', 'jpeg', 'gif', 'bmp', 'xbm' );
 960                 return in_array( $ext, $extensions );
 961         }
 962
 963         /**
 964          * Record an image upload in the upload log and the image table
 965          */
 966         function recordUpload( $oldver, $desc, $copyStatus = '', $source = '' ) {
 967                 global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 968                 global $wgUseCopyrightUpload, $wgUseSquid, $wgPostCommitUpdateList;
 969
 970                 $fname = 'Image::recordUpload';
 971                 $dbw =& wfGetDB( DB_MASTER );
 972
 973                 # img_name must be unique
 974                 if ( !$dbw->indexUnique( 'image', 'img_name' ) && !$dbw->indexExists('image','PRIMARY') ) {
 975                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
 976                 }
 977
 978                 // Delete thumbnails and refresh the metadata cache
 979                 $this->purgeCache();
 980
 981                 // Fail now if the image isn't there
 982                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
 983                         return false;
 984                 }
 985
 986                 if ( $wgUseCopyrightUpload ) {
 987                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 988                           '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 989                           '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 990                 } else {
 991                         $textdesc = $desc;
 992                 }
 993
 994                 $now = $dbw->timestamp();
 995
 996                 # Test to see if the row exists using INSERT IGNORE
 997                 # This avoids race conditions by locking the row until the commit, and also
 998                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
 999                 $dbw->insert( 'image',
1000                         array(
1001                                 'img_name' => $this->name,
1002                                 'img_size'=> $this->size,
1003                                 'img_width' => $this->width,
1004                                 'img_height' => $this->height,
1005                                 'img_bits' => $this->bits,
1006                                 'img_type' => $this->type,
1007                                 'img_timestamp' => $now,
1008                                 'img_description' => $desc,
1009                                 'img_user' => $wgUser->getID(),
1010                                 'img_user_text' => $wgUser->getName(),
1011                         ), $fname, 'IGNORE'
1012                 );
1013                 $descTitle = $this->getTitle();
1014                 $purgeURLs = array();
1015
1016                 if ( $dbw->affectedRows() ) {
1017                         # Successfully inserted, this is a new image
1018                         $id = $descTitle->getArticleID();
1019
1020                         if ( $id == 0 ) {
1021                                 $article = new Article( $descTitle );
1022                                 $article->insertNewArticle( $textdesc, $desc, false, false, true );
1023                         }
1024                 } else {
1025                         # Collision, this is an update of an image
1026                         # Insert previous contents into oldimage
1027                         $dbw->insertSelect( 'oldimage', 'image',
1028                                 array(
1029                                         'oi_name' => 'img_name',
1030                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1031                                         'oi_size' => 'img_size',
1032                                         'oi_width' => 'img_width',
1033                                         'oi_height' => 'img_height',
1034                                         'oi_bits' => 'img_bits',
1035                                         'oi_type' => 'img_type',
1036                                         'oi_timestamp' => 'img_timestamp',
1037                                         'oi_description' => 'img_description',
1038                                         'oi_user' => 'img_user',
1039                                         'oi_user_text' => 'img_user_text',
1040                                 ), array( 'img_name' => $this->name ), $fname
1041                         );
1042
1043                         # Update the current image row
1044                         $dbw->update( 'image',
1045                                 array( /* SET */
1046                                         'img_size' => $this->size,
1047                                         'img_width' => $this->width,
1048                                         'img_height' => $this->height,
1049                                         'img_bits' => $this->bits,
1050                                         'img_type' => $this->type,
1051                                         'img_timestamp' => $now,
1052                                         'img_user' => $wgUser->getID(),
1053                                         'img_user_text' => $wgUser->getName(),
1054                                         'img_description' => $desc,
1055                                 ), array( /* WHERE */
1056                                         'img_name' => $this->name
1057                                 ), $fname
1058                         );
1059
1060                         # Invalidate the cache for the description page
1061                         $descTitle->invalidateCache();
1062                         $purgeURLs[] = $descTitle->getInternalURL();
1063                 }
1064
1065                 # Invalidate cache for all pages using this image
1066                 $linksTo = $this->getLinksTo();
1067
1068                 if ( $wgUseSquid ) {
1069                         $u = SquidUpdate::newFromTitles( $linksTo, $purgeURLs );
1070                         array_push( $wgPostCommitUpdateList, $u );
1071                 }
1072                 Title::touchArray( $linksTo );
1073
1074                 $log = new LogPage( 'upload' );
1075                 $log->addEntry( 'upload', $descTitle, $desc );
1076
1077                 return true;
1078         }
1079
1080         /**
1081          * Get an array of Title objects which are articles which use this image
1082          * Also adds their IDs to the link cache
1083          *
1084          * This is mostly copied from Title::getLinksTo()
1085          */
1086         function getLinksTo( $options = '' ) {
1087                 global $wgLinkCache;
1088                 $fname = 'Image::getLinksTo';
1089                 wfProfileIn( $fname );
1090
1091                 if ( $options ) {
1092                         $db =& wfGetDB( DB_MASTER );
1093                 } else {
1094                         $db =& wfGetDB( DB_SLAVE );
1095                 }
1096
1097                 extract( $db->tableNames( 'page', 'imagelinks' ) );
1098                 $encName = $db->addQuotes( $this->name );
1099                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1100                 $res = $db->query( $sql, $fname );
1101
1102                 $retVal = array();
1103                 if ( $db->numRows( $res ) ) {
1104                         while ( $row = $db->fetchObject( $res ) ) {
1105                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1106                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1107                                         $retVal[] = $titleObj;
1108                                 }
1109                         }
1110                 }
1111                 $db->freeResult( $res );
1112                 return $retVal;
1113         }
1114
1115         function retrieveExifData () {
1116                 global $wgShowEXIF ;
1117                 if ( ! $wgShowEXIF ) return array () ;
1118
1119                 $file = $this->getImagePath () ;
1120                 $per = new phpExifReader ( $file ) ;
1121                 $per->processFile () ;
1122                 $a = $per->getImageInfo() ;
1123                 unset ( $a["FileName"] ) ;
1124                 unset ( $a["Thumbnail"] ) ;
1125                 return $a ;
1126         }
1127
1128         function getExifData () {
1129                 return $this->retrieveExifData () ;
1130         }
1131
1132         function storeExifData () {
1133         }
1134
1135 } //class
1136
1137
1138 /**
1139  * Returns the image directory of an image
1140  * If the directory does not exist, it is created.
1141  * The result is an absolute path.
1142  *
1143  * This function is called from thumb.php before Setup.php is included
1144  *
1145  * @param string $fname         file name of the image file
1146  * @access public
1147  */
1148 function wfImageDir( $fname ) {
1149         global $wgUploadDirectory, $wgHashedUploadDirectory;
1150
1151         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1152
1153         $hash = md5( $fname );
1154         $oldumask = umask(0);
1155         $dest = $wgUploadDirectory . '/' . $hash{0};
1156         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1157         $dest .= '/' . substr( $hash, 0, 2 );
1158         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1159
1160         umask( $oldumask );
1161         return $dest;
1162 }
1163
1164 /**
1165  * Returns the image directory of an image's thubnail
1166  * If the directory does not exist, it is created.
1167  * The result is an absolute path.
1168  *
1169  * This function is called from thumb.php before Setup.php is included
1170  *
1171  * @param string $fname         file name of the original image file
1172  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1173  * @param boolean $shared       (optional) use the shared upload directory
1174  * @access public
1175  */
1176 function wfImageThumbDir( $fname, $shared = false ) {
1177         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1178         if ( Image::isHashed( $shared ) ) {
1179                 $dir =  "$base/$fname";
1180
1181                 if ( !is_dir( $base ) ) {
1182                         $oldumask = umask(0);
1183                         @mkdir( $base, 0777 );
1184                         umask( $oldumask );
1185                 }
1186
1187                 if ( ! is_dir( $dir ) ) {
1188                         $oldumask = umask(0);
1189                         @mkdir( $dir, 0777 );
1190                         umask( $oldumask );
1191                 }
1192         } else {
1193                 $dir = $base;
1194         }
1195
1196         return $dir;
1197 }
1198
1199 /**
1200  * Old thumbnail directory, kept for conversion
1201  */
1202 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1203         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1204 }
1205
1206 /**
1207  * Returns the image directory of an image's old version
1208  * If the directory does not exist, it is created.
1209  * The result is an absolute path.
1210  *
1211  * This function is called from thumb.php before Setup.php is included
1212  *
1213  * @param string $fname         file name of the thumbnail file, including file size prefix
1214  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1215  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1216  * @access public
1217  */
1218 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1219         global $wgUploadDirectory, $wgHashedUploadDirectory,
1220                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1221         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1222         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1223         if (!$hashdir) { return $dir.'/'.$subdir; }
1224         $hash = md5( $fname );
1225         $oldumask = umask(0);
1226
1227         # Suppress warning messages here; if the file itself can't
1228         # be written we'll worry about it then.
1229         wfSuppressWarnings();
1230
1231         $archive = $dir.'/'.$subdir;
1232         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1233         $archive .= '/' . $hash{0};
1234         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1235         $archive .= '/' . substr( $hash, 0, 2 );
1236         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1237
1238         wfRestoreWarnings();
1239         umask( $oldumask );
1240         return $archive;
1241 }
1242
1243
1244 /*
1245  * Return the hash path component of an image path (URL or filesystem),
1246  * e.g. "/3/3c/", or just "/" if hashing is not used.
1247  *
1248  * @param $dbkey The filesystem / database name of the file
1249  * @param $fromSharedDirectory Use the shared file repository? It may
1250  *   use different hash settings from the local one.
1251  */
1252 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1253         global $wgHashedSharedUploadDirectory, $wgSharedUploadDirectory;
1254         global $wgHashedUploadDirectory;
1255
1256         if( Image::isHashed( $fromSharedDirectory ) ) {
1257                 $hash = md5($dbkey);
1258                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1259         } else {
1260                 return '/';
1261         }
1262 }
1263
1264 /**
1265  * Returns the image URL of an image's old version
1266  *
1267  * @param string $fname         file name of the image file
1268  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1269  * @access public
1270  */
1271 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1272         global $wgUploadPath, $wgHashedUploadDirectory;
1273
1274         if ($wgHashedUploadDirectory) {
1275                 $hash = md5( substr( $name, 15) );
1276                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1277                   substr( $hash, 0, 2 ) . '/'.$name;
1278         } else {
1279                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1280         }
1281         return wfUrlencode($url);
1282 }
1283
1284 /**
1285  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1286  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1287  *
1288  * @param string $length
1289  * @return int Length in pixels
1290  */
1291 function wfScaleSVGUnit( $length ) {
1292         static $unitLength = array(
1293                 'px' => 1.0,
1294                 'pt' => 1.25,
1295                 'pc' => 15.0,
1296                 'mm' => 3.543307,
1297                 'cm' => 35.43307,
1298                 'in' => 90.0,
1299                 ''   => 1.0, // "User units" pixels by default
1300                 '%'  => 2.0, // Fake it!
1301                 );
1302         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1303                 $length = FloatVal( $matches[1] );
1304                 $unit = $matches[2];
1305                 return round( $length * $unitLength[$unit] );
1306         } else {
1307                 // Assume pixels
1308                 return round( FloatVal( $length ) );
1309         }
1310 }
1311
1312 /**
1313  * Compatible with PHP getimagesize()
1314  * @todo support gzipped SVGZ
1315  * @todo check XML more carefully
1316  * @todo sensible defaults
1317  *
1318  * @param string $filename
1319  * @return array
1320  */
1321 function wfGetSVGsize( $filename ) {
1322         $width = 256;
1323         $height = 256;
1324
1325         // Read a chunk of the file
1326         $f = fopen( $filename, "rt" );
1327         if( !$f ) return false;
1328         $chunk = fread( $f, 4096 );
1329         fclose( $f );
1330
1331         // Uber-crappy hack! Run through a real XML parser.
1332         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1333                 return false;
1334         }
1335         $tag = $matches[1];
1336         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1337                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1338         }
1339         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1340                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1341         }
1342
1343         return array( $width, $height, 'SVG',
1344                 "width=\"$width\" height=\"$height\"" );
1345 }
1346
1347 /**
1348  * Is an image on the bad image list?
1349  */
1350 function wfIsBadImage( $name ) {
1351         global $wgLang;
1352
1353         $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1354         foreach ( $lines as $line ) {
1355                 if ( preg_match( '/^\*\s*\[\[:(' . $wgLang->getNsText( NS_IMAGE ) . ':.*(?=]]))\]\]/', $line, $m ) ) {
1356                         $t = Title::newFromText( $m[1] );
1357                         if ( $t->getDBkey() == $name ) {
1358                                 return true;
1359                         }
1360                 }
1361         }
1362         return false;
1363 }
1364
1365
1366
1367 /**
1368  * Wrapper class for thumbnail images
1369  * @package MediaWiki
1370  */
1371 class ThumbnailImage {
1372         /**
1373          * @param string $path Filesystem path to the thumb
1374          * @param string $url URL path to the thumb
1375          * @access private
1376          */
1377         function ThumbnailImage( $url, $width, $height, $path = false ) {
1378                 $this->url = $url;
1379                 $this->width = $width;
1380                 $this->height = $height;
1381                 $this->path = $path;
1382         }
1383
1384         /**
1385          * @return string The thumbnail URL
1386          */
1387         function getUrl() {
1388                 return $this->url;
1389         }
1390
1391         /**
1392          * Return HTML <img ... /> tag for the thumbnail, will include
1393          * width and height attributes and a blank alt text (as required).
1394          *
1395          * You can set or override additional attributes by passing an
1396          * associative array of name => data pairs. The data will be escaped
1397          * for HTML output, so should be in plaintext.
1398          *
1399          * @param array $attribs
1400          * @return string
1401          * @access public
1402          */
1403         function toHtml( $attribs = array() ) {
1404                 $attribs['src'] = $this->url;
1405                 $attribs['width'] = $this->width;
1406                 $attribs['height'] = $this->height;
1407                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1408
1409                 $html = '<img ';
1410                 foreach( $attribs as $name => $data ) {
1411                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1412                 }
1413                 $html .= '/>';
1414                 return $html;
1415         }
1416
1417 }
1418 ?>