decode_slice2.rs

#[no_mangle]
pub extern "system" fn decodeConfigSliceUrlSafe2(
  env: JNIEnv,
  _class: JClass,
  payload: jbyteArray,
  size: usize,
  output: *mut u8,
  output_size: usize,
) -> usize {
  let arr = env.get_byte_array_elements(
    payload,
    ReleaseMode::NoCopyBack,
  ).unwrap();

  let (input_slice, output_slice) = unsafe {
    (
      std::slice::from_raw_parts(arr.as_ptr() as *const u8, size),
      std::slice::from_raw_parts_mut(output, output_size),
    )
  };

  return base64::decode_config_slice(
    input_slice,
    base64::URL_SAFE_NO_PAD,
    output_slice,
  ).unwrap();
}