Just performs b64 encoding of stdin to stdout.

etc/b64.lua

@@ -0,0 +1,8 @@
+local base64 = socket.mime.base64.encode()
+local split = socket.mime.split()
+local convert = socket.mime.chain(base64, split)
+while 1 do
+    local chunk = io.read(4096)
+    io.write(convert(chunk))
+    if not chunk then break end
+end