includes/media/Jpeg.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup Media
   5  */
   6
   7 /**
   8  * JPEG specific handler.
   9  * Inherits most stuff from BitmapHandler, just here to do the metadata handler differently.
  10  *
  11  * Metadata stuff common to Jpeg and built-in Tiff (not PagedTiffHandler) is
  12  * in ExifBitmapHandler.
  13  *
  14  * @ingroup Media
  15  */
  16 class JpegHandler extends ExifBitmapHandler {
  17
  18         function getMetadata ( $image, $filename ) {
  19                 try {
  20                         $meta = BitmapMetadataHandler::Jpeg( $filename );
  21                         if ( !is_array( $meta ) ) {
  22                                 // This should never happen, but doesn't hurt to be paranoid.
  23                                 throw new MWException('Metadata array is not an array');
  24                         }
  25                         $meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
  26                         return serialize( $meta );
  27                 }
  28                 catch ( MWException $e ) {
  29                         // BitmapMetadataHandler throws an exception in certain exceptional cases like if file does not exist.
  30                         wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
  31
  32                         /* This used to use 0 (ExifBitmapHandler::OLD_BROKEN_FILE) for the cases
  33                          *      * No metadata in the file
  34                          *      * Something is broken in the file.
  35                          * However, if the metadata support gets expanded then you can't tell if the 0 is from
  36                          * a broken file, or just no props found. A broken file is likely to stay broken, but
  37                          * a file which had no props could have props once the metadata support is improved.
  38                          * Thus switch to using -1 to denote only a broken file, and use an array with only
  39                          * MEDIAWIKI_EXIF_VERSION to denote no props.
  40                          */
  41                         return ExifBitmapHandler::BROKEN_FILE;
  42                 }
  43         }
  44
  45 }
  46