How to convert large UTF-8 strings into ASCII?

Question

I need to convert large UTF-8 strings into ASCII. It should be reversible, and ideally a quick/lightweight algorithm.

How can I do this? I need the source

Answer 1

Your requirement is pretty strange.

Converting UTF-8 into ASCII would loose all information about Unicode codepoints > 127 (i.e. everything that's not in ASCII).

You could, however try to encode your Unicode data (no matter what source encoding) in an ASCII-compatible encoding, such as UTF-7. This would mean that the data that is produced could legally be interpreted as ASCII, but it is really UTF-7.