text: //
  // Copyright © 2018 Sandcastle Software Ltd. All rights reserved.
  //
  // This file is part of 'Oaknut' which is released under the MIT License.
  // See the LICENSE file in the root of this installation for details.
  //
  
  string base64_encode(const string& str);
  string base64_encode(const bytearray& array);
  string base64_encode(uint8_t const* buf, unsigned int bufLen);
  bytearray base64_decode(string const& encoded_string);
  
  