type TypedArray =
    | Int8Array
    | Uint8Array
    | Int16Array
    | Uint16Array
    | Int32Array
    | Uint32Array
    | Uint8ClampedArray
    | Float32Array
    | Float64Array;

export function b64Encode(buff: ArrayBuffer | TypedArray): string {
    return btoa(
        new Uint8Array(buff).reduce((s, b) => s + String.fromCharCode(b), "")
    );
}

export function b64Decode(string: string): Uint8Array {
    // We must remove newline characters from input string
    const raw = window.atob(string.replace(/[\r\n]/g, ""));
    const array = new Uint8Array(new ArrayBuffer(raw.length));

    for (let i = 0; i < raw.length; i++) {
        array[i] = raw.charCodeAt(i);
    }
    return array;
}