server/lib/preview/svg.php

<?php
/**
 * Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */
if (extension_loaded('imagick')){

	class OC_Preview_SVG extends OC_Preview_Provider{

		public function getMimeType(){
			return '/image\/svg\+xml/';
		}

		public function getThumbnail($path,$maxX,$maxY,$scalingup,$fileview) {
			$svg = new Imagick();
			$svg->setResolution($maxX, $maxY);
			$svg->readImageBlob('<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . $fileview->file_get_contents($path));
			$svg->setImageFormat('jpg');

			//new image object
			$image = new \OC_Image($svg);
			//check if image object is valid
			if (!$image->valid()) return false;

			return $image;
		}
	}

	OC_Preview::registerProvider('OC_Preview_SVG');

}