Eco fuzz fix

[tokatoka]

let mut average_cost = (state.corpus().count() / state.executions()) as u64;
should be
let mut average_cost = (state.executions() / state.corpus().count()) as u64;
no?

[andreafioraldi]

it seems yes, or maybe it needs to be a f64 type, have you checked the original code?

[tokatoka]

https://github.com/MoonLight-SteinsGate/EcoFuzz/blob/1fd94608291b708e9c97240780aea16349c688b8/EcoFuzz/afl-fuzz.c#L5290

It looks different than what it is now

[andreafioraldi]

yes it is let mut average_cost = (state.executions() / state.corpus().count()) as u64;

[tokatoka]

but that's only the initial computation.
later it becomes like a derivative i.e. Δ(executions)/Δ(corpus)

[tokatoka]

i'll check other codes too

[tokatoka]

I pushed more fixes

• change how regret is computed
• negate was_fuzzed

[tokatoka]

fixed bunches of other issues too,
please check @andreafioraldi

[andreafioraldi]

ok makes more sense, i coded it in one day