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frontend/util/util.ts

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+// Copyright 2024, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0s
+
+import base64 from "base64-js";
+
+function base64ToString(b64: string): string {
+    const stringBytes = base64.toByteArray(b64);
+    return new TextDecoder().decode(stringBytes);
+}
+
+function stringToBase64(input: string): string {
+    const stringBytes = new TextEncoder().encode(input);
+    return base64.fromByteArray(stringBytes);
+}
+
+function base64ToArray(b64: string): Uint8Array {
+    const rawStr = atob(b64);
+    const rtnArr = new Uint8Array(new ArrayBuffer(rawStr.length));
+    for (let i = 0; i < rawStr.length; i++) {
+        rtnArr[i] = rawStr.charCodeAt(i);
+    }
+    return rtnArr;
+}
+
+export { base64ToString, stringToBase64, base64ToArray };