Tiff.php

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<?php
class TiffHandler extends ExifBitmapHandler {

        function canRender( $file ) {
                global $wgTiffThumbnailType;
                return (bool)$wgTiffThumbnailType
                        || ($file->getRepo() instanceof ForeignAPIRepo);
        }

        function mustRender( $file ) {
                return true;
        }

        function getThumbType( $ext, $mime, $params = null ) {
                global $wgTiffThumbnailType;
                return $wgTiffThumbnailType;
        }

        function getMetadata( $image, $filename ) {
                global $wgShowEXIF;
                if ( $wgShowEXIF ) {
                        try {
                                $meta = BitmapMetadataHandler::Tiff( $filename );
                                if ( !is_array( $meta ) ) {
                                        // This should never happen, but doesn't hurt to be paranoid.
                                        throw new MWException('Metadata array is not an array');
                                }
                                $meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
                                return serialize( $meta );
                        }
                        catch ( MWException $e ) {
                                // BitmapMetadataHandler throws an exception in certain exceptional
                                // cases like if file does not exist.
                                wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
                                return ExifBitmapHandler::BROKEN_FILE;
                        }
                } else {
                        return '';
                }
        }
}