Optimal Base64 Encoding/Decoding

[DD]

Hi,

I don't know if this is the right newsgroup to post this query.
If not, my apologies, and could you please point me to the correct
newsgroup.

Does anyone have information on C, C++ or preferrably Java code for Base64
encoding and decoding optimised for speed.
Base64 is pretty simple and I've been working on this for a week now but I
seem to have hit a limit as to the best performance I can get. I feel it
should be able to be done faster but I can't see any remaining speedups.

Thanks,
Dermot.