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[Question] Magic bitwise operations #53

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nikoTM opened this issue Feb 25, 2023 · 0 comments

nikoTM commented Feb 25, 2023

Hi! Any chance you could elaborate on this code:

SaintCoinach/SaintCoinach/Xiv/WeatherRate.cs

Line 93 in f969b44

private static int CalculateTarget(EorzeaDateTime time) {

I stumbled upon this fascinating piece yesterday, still trying to understand what exactly is being done there:

var calcBase = (totalDays * 0x64) + increment;

var step1 = (calcBase << 0xB) ^ calcBase;
var step2 = (step1 >> 8) ^ step1;

return (int)(step2 % 0x64);

Thanks

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