private DataInputStream getStreamFromBase64(String base64String) {
    return new DataInputStream(new ByteBufferInputStream(ByteBuffer.wrap(Base64.decodeBase64(base64String))));
  }
Convert a base-64 encoded string into a {@link DataInputStream}
@param base64String the base-64 encoded {@link String}
@return the {@link DataInputStream}
ambry-commons/src/test/java/com/github/ambry/commons/BlobIdTest.java