export function ensureUint8Array(
  buffer: ArrayLike<number> | Uint8Array | ArrayBufferView | ArrayBuffer,
): Uint8Array {
  if (buffer instanceof Uint8Array) {
    return buffer;
  }
  if (ArrayBuffer.isView(buffer)) {
    return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);
  }
  if (buffer instanceof ArrayBuffer) {
    return new Uint8Array(buffer);
  }
  return Uint8Array.from(buffer);
}

export function createDataView(
  buffer: ArrayLike<number> | ArrayBufferView | ArrayBuffer,
): DataView {
  if (buffer instanceof ArrayBuffer) {
    return new DataView(buffer);
  }

  const bufferView = ensureUint8Array(buffer);
  return new DataView(bufferView.buffer, bufferView.byteOffset, bufferView.byteLength);
}