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+/*
+ * Copyright (C) 2020 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+const mediaUtility = (() => {
+ function getFileNameExtension(fileName) {
+ const match = /\.[^.]*$/.exec(fileName);
+ return match !== null ? match[0] : '';
+ }
+
+ function getImageMediaTypeFromFileName(fileName) {
+ switch (getFileNameExtension(fileName).toLowerCase()) {
+ case '.apng':
+ return 'image/apng';
+ case '.bmp':
+ return 'image/bmp';
+ case '.gif':
+ return 'image/gif';
+ case '.ico':
+ case '.cur':
+ return 'image/x-icon';
+ case '.jpg':
+ case '.jpeg':
+ case '.jfif':
+ case '.pjpeg':
+ case '.pjp':
+ return 'image/jpeg';
+ case '.png':
+ return 'image/png';
+ case '.svg':
+ return 'image/svg+xml';
+ case '.tif':
+ case '.tiff':
+ return 'image/tiff';
+ case '.webp':
+ return 'image/webp';
+ default:
+ return null;
+ }
+ }
+
+ function loadImage(mediaType, base64Source) {
+ return new Promise((resolve, reject) => {
+ const image = new Image();
+ const eventListeners = new EventListenerCollection();
+ eventListeners.addEventListener(image, 'load', () => {
+ eventListeners.removeAllEventListeners();
+ resolve(image);
+ }, false);
+ eventListeners.addEventListener(image, 'error', () => {
+ eventListeners.removeAllEventListeners();
+ reject(new Error('Image failed to load'));
+ }, false);
+ image.src = `data:${mediaType};base64,${base64Source}`;
+ });
+ }
+
+ return {
+ getImageMediaTypeFromFileName,
+ loadImage
+ };
+})();