buffer: make indexOf faster

[trevnorris]

Improve the performance of IndexOf() for Buffer#indexOf() searches.

NOTE: This is very ugly right now, but sooo much faster. Looking for feedback at the moment.

R=@bnoordhuis

[trevnorris]

okay. so it seems that V8's string match is still crazy faster than this. still have a ways to go.

[indutny]

Is it available on windows?

[indutny]

Guess it isn't: https://msdn.microsoft.com/en-us/library/aa246468(v=vs.60).aspx

[trevnorris]

suck, seriously? alright, back to the drawing board.

[mscdex]

Maybe just pick a "good" algorithm from here to use on Windows (or everywhere for consistency?). Start with Turbo Boyer-Moore or Boyer-Moore-Horspool perhaps?

[trevnorris]

@mscdex TBH this implementation was thrown together in 10 mins, and is by no means a good implementation. i'll take the time to read up more on proper Boyer-Moore implementations. Thanks for the links.

[Fishrock123]

@trevnorris can we close this and re-open a new one when you come up with a good way of doing it?

[trevnorris]

@Fishrock123 Sure.