Someone probably brought this up before but i couldn't find it.

So i was wondering how you can determine the actual house edge just by looking at the code.
Specifically this part of the code:

// This will be the client seed of block 339300
var clientSeed = '000000000000000007a9a31ff7f07463d91af6b5454241d5faf282e5e0fe1b3a';

exports.crashPointFromHash = function(serverSeed) {
    var hash = crypto.createHmac('sha256', serverSeed).update(clientSeed).digest('hex');

    // In 1 of 101 games the game crashes instantly.
    if (divisible(hash, 51))
        return 0;

    // Use the most significant 52-bit from the hash to calculate the crash point
   console.log('hash: '+hash);
   var slice   =   hash.slice(0,52/4);
   console.log(typeof hash);
   console.log('slice: '+slice);
   var h = parseInt(slice,16);
   console.log('h: '+h);
    var e = Math.pow(2,52);

    return Math.floor(((100 * e) - h) / (e - h));
};
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I'd really appreciate if someone could elaborate on how this code is used to alter the house edge other than the insta crash function obviously.
The method of converting a game hash to a money pot multiplier is quite complex and i just don't know how i would go about calculating the house edge for a certain multiplier.
Edit: I know it's possible to use odd calculator on bustabit but i'd still like to know what it does