includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * $Id$
   5  */
   6
   7 /**
   8  * Class to represent an image
   9  *
  10  * Provides methods to retrieve paths (physical, logical, URL),
  11  * to generate thumbnails or for uploading.
  12  * @package MediaWiki
  13  */
  14 class Image
  15 {
  16         /**#@+
  17          * @access private
  18          */
  19         var     $name,          # name of the image
  20                 $imagePath,     # Path of the image
  21                 $url,           # Image URL
  22                 $title,         # Title object for this image. Initialized when needed.
  23                 $fileExists,    # does the image file exist on disk?
  24                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory
  25                 $historyLine,   # Number of line to return by nextHistoryLine()
  26                 $historyRes,    # result of the query for the image's history
  27                 $width,         # \
  28                 $height,        #  |
  29                 $bits,          #   --- returned by getimagesize, see http://de3.php.net/manual/en/function.getimagesize.php
  30                 $type,          #  |
  31                 $attr;          # /
  32
  33         /**#@-*/
  34
  35
  36         /**
  37          * Create an Image object from an image name
  38          *
  39          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  40          * @access public
  41          */
  42         function Image( $name )
  43         {
  44                 global $wgUploadDirectory,$wgHashedUploadDirectory,
  45                        $wgUseSharedUploads, $wgSharedUploadDirectory,
  46                        $wgHashedSharedUploadDirectory;
  47
  48                 $this->name      = $name;
  49                 $this->title     = Title::makeTitleSafe( NS_IMAGE, $this->name );
  50                 $this->fromSharedDirectory = false;
  51
  52                 if ($wgHashedUploadDirectory) {
  53                         $hash            = md5( $this->title->getDBkey() );
  54                         $this->imagePath = $wgUploadDirectory . '/' . $hash{0} . '/' .
  55                                                 substr( $hash, 0, 2 ) . "/{$name}";
  56                 } else {
  57                         $this->imagePath = $wgUploadDirectory . '/' . $name;
  58                 }
  59                 $this->fileExists = file_exists( $this->imagePath);
  60
  61                 # If the file is not found, and a shared upload directory
  62                 # like the Wikimedia Commons is used, look for it there.
  63                 if (!$this->fileExists && $wgUseSharedUploads) {
  64
  65                         if($wgHashedSharedUploadDirectory) {
  66                                 $hash = md5( $this->title->getDBkey() );
  67                                 $this->imagePath = $wgSharedUploadDirectory . '/' . $hash{0} . '/' .
  68                                         substr( $hash, 0, 2 ) . "/{$name}";
  69                         } else {
  70                                 $this->imagePath = $wgSharedUploadDirectory . '/' . $name;
  71                         }
  72                         $this->fileExists = file_exists( $this->imagePath);
  73                         $this->fromSharedDirectory = true;
  74                         #wfDebug ("File from shared directory: ".$this->imagePath."\n");
  75                 }
  76                 if($this->fileExists) {
  77                         $this->url       = $this->wfImageUrl( $name, $this->fromSharedDirectory );
  78                 } else {
  79                         $this->url='';
  80                 }
  81
  82                 $n = strrpos( $name, '.' );
  83                 $this->extension = strtolower( $n ? substr( $name, $n + 1 ) : '' );
  84
  85
  86                 if ( $this->fileExists )
  87                 {
  88                         if( $this->extension == 'svg' ) {
  89                                 @$gis = getSVGsize( $this->imagePath );
  90                         } else {
  91                                 @$gis = getimagesize( $this->imagePath );
  92                         }
  93                         if( $gis !== false ) {
  94                                 $this->width = $gis[0];
  95                                 $this->height = $gis[1];
  96                                 $this->type = $gis[2];
  97                                 $this->attr = $gis[3];
  98                                 if ( isset( $gis['bits'] ) )  {
  99                                         $this->bits = $gis['bits'];
 100                                 } else {
 101                                         $this->bits = 0;
 102                                 }
 103                         }
 104                 }
 105                 $this->historyLine = 0;
 106         }
 107
 108         /**
 109          * Factory function
 110          *
 111          * Create a new image object from a title object.
 112          *
 113          * @param Title $nt Title object. Must be from namespace "image"
 114          * @access public
 115          */
 116         function newFromTitle( $nt )
 117         {
 118                 $img = new Image( $nt->getDBKey() );
 119                 $img->title = $nt;
 120                 return $img;
 121         }
 122
 123         /**
 124          * Return the name of this image
 125          * @access public
 126          */
 127         function getName()
 128         {
 129                 return $this->name;
 130         }
 131
 132         /**
 133          * Return the associated title object
 134          * @access public
 135          */
 136         function getTitle()
 137         {
 138                 return $this->title;
 139         }
 140
 141         /**
 142          * Return the URL of the image file
 143          * @access public
 144          */
 145         function getURL()
 146         {
 147                 return $this->url;
 148         }
 149
 150         function getViewURL() {
 151                 if( $this->mustRender() ) {
 152                         return $this->createThumb( $this->getWidth() );
 153                 } else {
 154                         return $this->getURL();
 155                 }
 156         }
 157
 158         /**
 159          * Return the image path of the image in the
 160          * local file system as an absolute path
 161          * @access public
 162          */
 163         function getImagePath()
 164         {
 165                 return $this->imagePath;
 166         }
 167
 168         /**
 169          * Return the width of the image
 170          *
 171          * Returns -1 if the file specified is not a known image type
 172          * @access public
 173          */
 174         function getWidth()
 175         {
 176                 return $this->width;
 177         }
 178
 179         /**
 180          * Return the height of the image
 181          *
 182          * Returns -1 if the file specified is not a known image type
 183          * @access public
 184          */
 185         function getHeight()
 186         {
 187                 return $this->height;
 188         }
 189
 190         /**
 191          * Return the size of the image file, in bytes
 192          * @access public
 193          */
 194         function getSize()
 195         {
 196                 $st = stat( $this->getImagePath() );
 197                 return $st['size'];
 198         }
 199
 200         /**
 201          * Return the type of the image
 202          *
 203          * -  1 GIF
 204          * -  2 JPG
 205          * -  3 PNG
 206          * - 15 WBMP
 207          * - 16 XBM
 208          */
 209         function getType()
 210         {
 211                 return $this->type;
 212         }
 213
 214         /**
 215          * Return the escapeLocalURL of this image
 216          * @access public
 217          */
 218         function getEscapeLocalURL()
 219         {
 220                 return $this->title->escapeLocalURL();
 221         }
 222
 223         /**
 224          * Return the escapeFullURL of this image
 225          * @access public
 226          */
 227         function getEscapeFullURL()
 228         {
 229                 return $this->title->escapeFullURL();
 230         }
 231
 232         /**
 233          * Return the URL of an image, provided its name.
 234          *
 235          * @param string $name  Name of the image, without the leading "Image:"
 236          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 237          * @access public
 238          */
 239         function wfImageUrl( $name, $fromSharedDirectory = false )
 240         {
 241                 global $wgUploadPath,$wgUploadBaseUrl,$wgHashedUploadDirectory,
 242                        $wgHashedSharedUploadDirectory,$wgSharedUploadBaseUrl,
 243                        $wgSharedUploadPath;
 244                 if($fromSharedDirectory) {
 245                         $hash = $wgHashedSharedUploadDirectory;
 246                         $base = $wgSharedUploadBaseUrl;
 247                         $path = $wgSharedUploadPath;
 248                 } else {
 249                         $hash = $wgHashedUploadDirectory;
 250                         $base = $wgUploadBaseUrl;
 251                         $path = $wgUploadPath;
 252                 }
 253                 if ( $hash ) {
 254                         $hash = md5( $name );
 255                         $url = "{$base}{$path}/" . $hash{0} . "/" .
 256                         substr( $hash, 0, 2 ) . "/{$name}";
 257                 } else {
 258                         $url = "{$base}{$path}/{$name}";
 259                 }
 260                 return wfUrlencode( $url );
 261         }
 262
 263         /**
 264          * Returns true iff the image file exists on disk.
 265          *
 266          * @access public
 267          */
 268         function exists()
 269         {
 270                 return $this->fileExists;
 271         }
 272
 273         /**
 274          *
 275          * @access private
 276          */
 277         function thumbUrl( $width, $subdir='thumb') {
 278                 global $wgUploadPath,$wgHashedUploadDirectory, $wgUploadBaseUrl,
 279                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 280                        $wgHashedSharedUploadDirectory, $wgSharedUploadBaseUrl;
 281                 $name = $this->thumbName( $width );
 282                 if($this->fromSharedDirectory) {
 283                         $hashdir = $wgHashedSharedUploadDirectory;
 284                         $base = $wgSharedUploadBaseUrl;
 285                         $path = $wgSharedUploadPath;
 286                 } else {
 287                         $hashdir = $wgHashedUploadDirectory;
 288                         $base = $wgUploadBaseUrl;
 289                         $path = $wgUploadPath;
 290                 }
 291                 if ($hashdir) {
 292                         $hash = md5( $name );
 293                         $url = "{$base}{$path}/{$subdir}/" . $hash{0} . "/" .
 294                                 substr( $hash, 0, 2 ) . "/{$name}";
 295                 } else {
 296                         $url = "{$base}{$path}/{$subdir}/{$name}";
 297                 }
 298
 299                 return wfUrlencode($url);
 300         }
 301
 302         /**
 303          * Return the file name of a thumbnail of the specified width
 304          *
 305          * @param integer $width        Width of the thumbnail image
 306          * @access private
 307          */
 308         function thumbName( $width ) {
 309                 $thumb = $width."px-".$this->name;
 310                 if( $this->extension == 'svg' ) {
 311                         # Rasterize SVG vector images to PNG
 312                         $thumb .= '.png';
 313                 }
 314                 return $thumb;
 315         }
 316
 317         /**
 318          * Create a thumbnail of the image having the specified width/height.
 319          * The thumbnail will not be created if the width is larger than the
 320          * image's width. Let the browser do the scaling in this case.
 321          * The thumbnail is stored on disk and is only computed if the thumbnail
 322          * file does not exist OR if it is older than the image.
 323          * Returns the URL.
 324          *
 325          * Keeps aspect ratio of original image. If both width and height are
 326          * specified, the generated image will be no bigger than width x height,
 327          * and will also have correct aspect ratio.
 328          *
 329          * @param integer $width        maximum width of the generated thumbnail
 330          * @param integer $height       maximum height of the image (optional)
 331          * @access public
 332          */
 333         function createThumb( $width, $height=-1 ) {
 334                 if ( $height == -1 ) {
 335                         return $this->renderThumb( $width );
 336                 }
 337                 if ( $width < $this->width ) {
 338                         $thumbheight = $this->height * $width / $this->width;
 339                         $thumbwidth = $width;
 340                 } else {
 341                         $thumbheight = $this->height;
 342                         $thumbwidth = $this->width;
 343                 }
 344                 if ( $thumbheight > $height ) {
 345                         $thumbwidth = $thumbwidth * $height / $thumbheight;
 346                         $thumbheight = $height;
 347                 }
 348                 return $this->renderThumb( $thumbwidth );
 349         }
 350
 351         /**
 352          * Create a thumbnail of the image having the specified width.
 353          * The thumbnail will not be created if the width is larger than the
 354          * image's width. Let the browser do the scaling in this case.
 355          * The thumbnail is stored on disk and is only computed if the thumbnail
 356          * file does not exist OR if it is older than the image.
 357          * Returns the URL.
 358          *
 359          * @access private
 360          */
 361         function /* private */ renderThumb( $width ) {
 362                 global $wgImageMagickConvertCommand;
 363                 global $wgUseImageMagick;
 364                 global $wgUseSquid, $wgInternalServer;
 365
 366                 $width = IntVal( $width );
 367
 368                 $thumbName = $this->thumbName( $width );
 369                 $thumbPath = wfImageThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).'/'.$thumbName;
 370                 $thumbUrl  = $this->thumbUrl( $width );
 371                 #wfDebug ( "Render name: $thumbName path: $thumbPath url: $thumbUrl\n");
 372                 if ( ! $this->exists() )
 373                 {
 374                         # If there is no image, there will be no thumbnail
 375                         return '';
 376                 }
 377
 378                 # Sanity check $width
 379                 if( $width <= 0 ) {
 380                         # BZZZT
 381                         return '';
 382                 }
 383
 384                 if( $width > $this->width && !$this->mustRender() ) {
 385                         # Don't make an image bigger than the source
 386                         return $this->getViewURL();
 387                 }
 388
 389                 if ( (! file_exists( $thumbPath ) ) || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
 390                         if( $this->extension == 'svg' ) {
 391                                 global $wgSVGConverters, $wgSVGConverter;
 392                                 if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 393                                         global $wgSVGConverterPath;
 394                                         $cmd = str_replace(
 395                                                 array( '$path/', '$width', '$input', '$output' ),
 396                                                 array( $wgSVGConverterPath,
 397                                                            $width,
 398                                                            escapeshellarg( $this->imagePath ),
 399                                                            escapeshellarg( $thumbPath ) ),
 400                                                 $wgSVGConverters[$wgSVGConverter] );
 401                                         $conv = shell_exec( $cmd );
 402                                 } else {
 403                                         $conv = false;
 404                                 }
 405                         } elseif ( $wgUseImageMagick ) {
 406                                 # use ImageMagick
 407                                 # Specify white background color, will be used for transparent images
 408                                 # in Internet Explorer/Windows instead of default black.
 409                                 $cmd  =  $wgImageMagickConvertCommand .
 410                                         " -quality 85 -background white -geometry {$width} ".
 411                                         escapeshellarg($this->imagePath) . " " .
 412                                         escapeshellarg($thumbPath);
 413                                 $conv = shell_exec( $cmd );
 414                         } else {
 415                                 # Use PHP's builtin GD library functions.
 416                                 #
 417                                 # First find out what kind of file this is, and select the correct
 418                                 # input routine for this.
 419
 420                                 $truecolor = false;
 421
 422                                 switch( $this->type ) {
 423                                         case 1: # GIF
 424                                                 $src_image = imagecreatefromgif( $this->imagePath );
 425                                                 break;
 426                                         case 2: # JPG
 427                                                 $src_image = imagecreatefromjpeg( $this->imagePath );
 428                                                 $truecolor = true;
 429                                                 break;
 430                                         case 3: # PNG
 431                                                 $src_image = imagecreatefrompng( $this->imagePath );
 432                                                 $truecolor = ( $this->bits > 8 );
 433                                                 break;
 434                                         case 15: # WBMP for WML
 435                                                 $src_image = imagecreatefromwbmp( $this->imagePath );
 436                                                 break;
 437                                         case 16: # XBM
 438                                                 $src_image = imagecreatefromxbm( $this->imagePath );
 439                                                 break;
 440                                         default:
 441                                                 return 'Image type not supported';
 442                                                 break;
 443                                 }
 444                                 $height = floor( $this->height * ( $width/$this->width ) );
 445                                 if ( $truecolor ) {
 446                                         $dst_image = imagecreatetruecolor( $width, $height );
 447                                 } else {
 448                                         $dst_image = imagecreate( $width, $height );
 449                                 }
 450                                 imagecopyresampled( $dst_image, $src_image,
 451                                                         0,0,0,0,
 452                                                         $width, $height, $this->width, $this->height );
 453                                 switch( $this->type ) {
 454                                         case 1:  # GIF
 455                                         case 3:  # PNG
 456                                         case 15: # WBMP
 457                                         case 16: # XBM
 458                                                 #$thumbUrl .= ".png";
 459                                                 #$thumbPath .= ".png";
 460                                                 imagepng( $dst_image, $thumbPath );
 461                                                 break;
 462                                         case 2:  # JPEG
 463                                                 #$thumbUrl .= ".jpg";
 464                                                 #$thumbPath .= ".jpg";
 465                                                 imageinterlace( $dst_image );
 466                                                 imagejpeg( $dst_image, $thumbPath, 95 );
 467                                                 break;
 468                                         default:
 469                                                 break;
 470                                 }
 471                                 imagedestroy( $dst_image );
 472                                 imagedestroy( $src_image );
 473
 474
 475                         }
 476                         #
 477                         # Check for zero-sized thumbnails. Those can be generated when
 478                         # no disk space is available or some other error occurs
 479                         #
 480                         $thumbstat = stat( $thumbPath );
 481                         if( $thumbstat['size'] == 0 )
 482                         {
 483                                 unlink( $thumbPath );
 484                         }
 485
 486                         # Purge squid
 487                         # This has to be done after the image is updated and present for all machines on NFS,
 488                         # or else the old version might be stored into the squid again
 489                         if ( $wgUseSquid ) {
 490                                 $urlArr = Array(
 491                                         $wgInternalServer.$thumbUrl
 492                                 );
 493                                 wfPurgeSquidServers($urlArr);
 494                         }
 495                 }
 496                 return $thumbUrl;
 497         } // END OF function createThumb
 498
 499         /**
 500          * Return the image history of this image, line by line.
 501          * starts with current version, then old versions.
 502          * uses $this->historyLine to check which line to return:
 503          *  0      return line for current version
 504          *  1      query for old versions, return first one
 505          *  2, ... return next old version from above query
 506          *
 507          * @access public
 508          */
 509         function nextHistoryLine()
 510         {
 511                 $fname = 'Image::nextHistoryLine()';
 512                 $dbr =& wfGetDB( DB_SLAVE );
 513                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 514                         $this->historyRes = $dbr->select( 'image',
 515                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 516                                 array( 'img_name' => $this->title->getDBkey() ),
 517                                 $fname
 518                         );
 519                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 520                                 return FALSE;
 521                         }
 522                 } else if ( $this->historyLine == 1 ) {
 523                         $this->historyRes = $dbr->select( 'oldimage',
 524                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 525                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 526                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 527                         );
 528                 }
 529                 $this->historyLine ++;
 530
 531                 return $dbr->fetchObject( $this->historyRes );
 532         }
 533
 534         /**
 535          * Reset the history pointer to the first element of the history
 536          * @access public
 537          */
 538         function resetHistory()
 539         {
 540                 $this->historyLine = 0;
 541         }
 542
 543         /**
 544          * Return true if the file is of a type that can't be directly
 545          * rendered by typical browsers and needs to be re-rasterized.
 546          * @return bool
 547          */
 548         function mustRender() {
 549                 return ( $this->extension == 'svg' );
 550         }
 551
 552 } //class
 553
 554
 555 /**
 556  * Returns the image directory of an image
 557  * If the directory does not exist, it is created.
 558  * The result is an absolute path.
 559  *
 560  * @param string $fname         file name of the image file
 561  * @access public
 562  */
 563 function wfImageDir( $fname )
 564 {
 565         global $wgUploadDirectory, $wgHashedUploadDirectory;
 566
 567         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
 568
 569         $hash = md5( $fname );
 570         $oldumask = umask(0);
 571         $dest = $wgUploadDirectory . '/' . $hash{0};
 572         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 573         $dest .= '/' . substr( $hash, 0, 2 );
 574         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 575
 576         umask( $oldumask );
 577         return $dest;
 578 }
 579
 580 /**
 581  * Returns the image directory of an image's thubnail
 582  * If the directory does not exist, it is created.
 583  * The result is an absolute path.
 584  *
 585  * @param string $fname         file name of the thumbnail file, including file size prefix
 586  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
 587  * @param boolean $shared       (optional) use the shared upload directory
 588  * @access public
 589  */
 590 function wfImageThumbDir( $fname , $subdir='thumb', $shared=false)
 591 {
 592         return wfImageArchiveDir( $fname, $subdir, $shared );
 593 }
 594
 595 /**
 596  * Returns the image directory of an image's old version
 597  * If the directory does not exist, it is created.
 598  * The result is an absolute path.
 599  *
 600  * @param string $fname         file name of the thumbnail file, including file size prefix
 601  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
 602  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
 603  * @access public
 604  */
 605 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false )
 606 {
 607         global $wgUploadDirectory, $wgHashedUploadDirectory,
 608                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
 609         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
 610         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
 611         if (!$hashdir) { return $dir.'/'.$subdir; }
 612
 613         $hash = md5( $fname );
 614         $oldumask = umask(0);
 615         # Suppress warning messages here; if the file itself can't
 616         # be written we'll worry about it then.
 617         $archive = $dir.'/'.$subdir;
 618         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 619         $archive .= '/' . $hash{0};
 620         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 621         $archive .= '/' . substr( $hash, 0, 2 );
 622         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 623
 624         umask( $oldumask );
 625         return $archive;
 626 }
 627
 628 /**
 629  * Record an image upload in the upload log.
 630  */
 631 function wfRecordUpload( $name, $oldver, $size, $desc, $copyStatus = "", $source = "" )
 632 {
 633         global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 634         global $wgUseCopyrightUpload;
 635
 636         $fname = 'wfRecordUpload';
 637         $dbw =& wfGetDB( DB_MASTER );
 638
 639         # img_name must be unique
 640         if ( !$dbw->indexUnique( 'image', 'img_name' ) && !$dbw->indexExists('image','PRIMARY') ) {
 641                 wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
 642         }
 643
 644
 645         $now = wfTimestampNow();
 646         $won = wfInvertTimestamp( $now );
 647         $size = IntVal( $size );
 648
 649         if ( $wgUseCopyrightUpload )
 650           {
 651                 $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 652                   '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 653                   '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 654           }
 655         else $textdesc = $desc ;
 656
 657         $now = wfTimestampNow();
 658         $won = wfInvertTimestamp( $now );
 659
 660         # Test to see if the row exists using INSERT IGNORE
 661         # This avoids race conditions by locking the row until the commit, and also
 662         # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
 663         $dbw->insert( 'image',
 664                 array(
 665                         'img_name' => $name,
 666                         'img_size'=> $size,
 667                         'img_timestamp' => $dbw->timestamp($now),
 668                         'img_description' => $desc,
 669                         'img_user' => $wgUser->getID(),
 670                         'img_user_text' => $wgUser->getName(),
 671                 ), $fname, 'IGNORE'
 672         );
 673         $descTitle = Title::makeTitleSafe( NS_IMAGE, $name );
 674
 675         if ( $dbw->affectedRows() ) {
 676                 # Successfully inserted, this is a new image
 677                 $id = $descTitle->getArticleID();
 678
 679                 if ( $id == 0 ) {
 680                         $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
 681                         $dbw->insert( 'cur',
 682                                 array(
 683                                         'cur_id' => $seqVal,
 684                                         'cur_namespace' => NS_IMAGE,
 685                                         'cur_title' => $name,
 686                                         'cur_comment' => $desc,
 687                                         'cur_user' => $wgUser->getID(),
 688                                         'cur_user_text' => $wgUser->getName(),
 689                                         'cur_timestamp' => $dbw->timestamp($now),
 690                                         'cur_is_new' => 1,
 691                                         'cur_text' => $textdesc,
 692                                         'inverse_timestamp' => $won,
 693                                         'cur_touched' => $dbw->timestamp($now)
 694                                 ), $fname
 695                         );
 696                         $id = $dbw->insertId() or 0; # We should throw an error instead
 697
 698                         RecentChange::notifyNew( $now, $descTitle, 0, $wgUser, $desc );
 699
 700                         $u = new SearchUpdate( $id, $name, $desc );
 701                         $u->doUpdate();
 702                 }
 703         } else {
 704                 # Collision, this is an update of an image
 705                 # Get current image row for update
 706                 $s = $dbw->selectRow( 'image', array( 'img_name','img_size','img_timestamp','img_description',
 707                   'img_user','img_user_text' ), array( 'img_name' => $name ), $fname, 'FOR UPDATE' );
 708
 709                 # Insert it into oldimage
 710                 $dbw->insert( 'oldimage',
 711                         array(
 712                                 'oi_name' => $s->img_name,
 713                                 'oi_archive_name' => $oldver,
 714                                 'oi_size' => $s->img_size,
 715                                 'oi_timestamp' => $dbw->timestamp($s->img_timestamp),
 716                                 'oi_description' => $s->img_description,
 717                                 'oi_user' => $s->img_user,
 718                                 'oi_user_text' => $s->img_user_text
 719                         ), $fname
 720                 );
 721
 722                 # Update the current image row
 723                 $dbw->update( 'image',
 724                         array( /* SET */
 725                                 'img_size' => $size,
 726                                 'img_timestamp' => $dbw->timestamp(),
 727                                 'img_user' => $wgUser->getID(),
 728                                 'img_user_text' => $wgUser->getName(),
 729                                 'img_description' => $desc,
 730                         ), array( /* WHERE */
 731                                 'img_name' => $name
 732                         ), $fname
 733                 );
 734
 735                 # Invalidate the cache for the description page
 736                 $descTitle->invalidateCache();
 737         }
 738
 739         $log = new LogPage( 'upload' );
 740         $log->addEntry( 'upload', $descTitle, $desc );
 741 }
 742
 743 /**
 744  * Returns the image URL of an image's old version
 745  *
 746  * @param string $fname         file name of the image file
 747  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
 748  * @access public
 749  */
 750 function wfImageArchiveUrl( $name, $subdir='archive' )
 751 {
 752         global $wgUploadPath, $wgHashedUploadDirectory;
 753
 754         if ($wgHashedUploadDirectory) {
 755                 $hash = md5( substr( $name, 15) );
 756                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
 757                   substr( $hash, 0, 2 ) . '/'.$name;
 758         } else {
 759                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
 760         }
 761         return wfUrlencode($url);
 762 }
 763
 764 /**
 765  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
 766  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
 767  *
 768  * @param string $length
 769  * @return int Length in pixels
 770  */
 771 function scaleSVGUnit( $length ) {
 772         static $unitLength = array(
 773                 'px' => 1.0,
 774                 'pt' => 1.25,
 775                 'pc' => 15.0,
 776                 'mm' => 3.543307,
 777                 'cm' => 35.43307,
 778                 'in' => 90.0,
 779                 ''   => 1.0, // "User units" pixels by default
 780                 '%'  => 2.0, // Fake it!
 781                 );
 782         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
 783                 $length = FloatVal( $matches[1] );
 784                 $unit = $matches[2];
 785                 return round( $length * $unitLength[$unit] );
 786         } else {
 787                 // Assume pixels
 788                 return round( FloatVal( $length ) );
 789         }
 790 }
 791
 792 /**
 793  * Compatible with PHP getimagesize()
 794  * @todo support gzipped SVGZ
 795  * @todo check XML more carefully
 796  * @todo sensible defaults
 797  *
 798  * @param string $filename
 799  * @return array
 800  */
 801 function getSVGsize( $filename ) {
 802         $width = 256;
 803         $height = 256;
 804
 805         // Read a chunk of the file
 806         $f = fopen( $filename, "rt" );
 807         if( !$f ) return false;
 808         $chunk = fread( $f, 4096 );
 809         fclose( $f );
 810
 811         // Uber-crappy hack! Run through a real XML parser.
 812         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
 813                 return false;
 814         }
 815         $tag = $matches[1];
 816         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
 817                 $width = scaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
 818         }
 819         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
 820                 $height = scaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
 821         }
 822
 823         return array( $width, $height, 'SVG',
 824                 "width=\"$width\" height=\"$height\"" );
 825 }
 826
 827 ?>