Github user achristianson commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/307#discussion_r184138022
--- Diff: extensions/expression-language/base64.h ---
@@ -0,0 +1,188 @@
+/***************************************************************************
--- End diff --
This is the cURL base64 encode/decode. Here's why:
1) Avoid reinventing the wheel
2) It's a private function in cURL, so that's why it's copied rather than
exposing/calling into cURL lib
3) We already have cURL included & in LICENSE, so it's simple to use this
one
4) Simpler implementation to call than OpenSSL implementation
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