First Committ

src/js/utility.js

@@ -0,0 +1,28 @@
+function urlBase64ToUint8Array(base64String) {
+  const padding = '='.repeat((4 - base64String.length % 4) % 4);
+  const base64 = (base64String + padding)
+    .replace(/\-/g, '+')
+    .replace(/_/g, '/');
+
+  const rawData = window.atob(base64);
+  const outputArray = new Uint8Array(rawData.length);
+
+  for (let i = 0; i < rawData.length; ++i) {
+    outputArray[i] = rawData.charCodeAt(i);
+  }
+  return outputArray;
+}
+
+function dataURItoBlob(dataURI) {
+  const byteString = atob(dataURI.split(',')[1]);
+  const mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
+  const ab = new ArrayBuffer(byteString.length);
+  const ia = new Uint8Array(ab);
+  for (let i = 0; i < byteString.length; i++) {
+    ia[i] = byteString.charCodeAt(i);
+  }
+  const blob = new Blob([ab], { type: mimeString });
+  return blob;
+}
+
+export default urlBase64ToUint8Array