tree 2c15d1c4b547fc3fcdfbb81ce056787817002e51
parent 18f8f608b966c802b3e2a389e3c1ec5a1fd9407b
author Ed Tanous <ed@tanous.net> 1702493398 -0800
committer Ed Tanous <ed@tanous.net> 1705950920 +0000

Make base64 encoder incremental

As part of https://gerrit.openbmc.org/c/openbmc/bmcweb/+/67667, it would
be desirable if we could incrementally encode base64 in chunks.  Given
that base64 encoding requires encoding 3 characters to 4, there's a
possibility that a chunk might not be mod 3 length.

This commit moves the base64 encoder into a class that can run
incrementally.

Tested:  Unit tests pass.  More tests in next commit.

Change-Id: Ic7da3fd4db865c99fcbd96ae06fdecb87628f94c
Signed-off-by: Ed Tanous <ed@tanous.net>