[REQ] Chunk reading and Base64Encode

[ShaoSean]

Couple questions:

1) is there a way to chunk read from a file?
2) does the results of base64 encoding of chunk reading result in the same output as 
base64 encoding the whole file?

i'm just wondering so my email cient doesn't require a 1 gig of RAM to handle 
attachments..

-- 
-Sean