Aktueller Stand

backend/node_modules/pure-rand/lib/esm/generator/LinearCongruential.js

@@ -0,0 +1,47 @@
+var MULTIPLIER = 0x000343fd;
+var INCREMENT = 0x00269ec3;
+var MASK = 0xffffffff;
+var MASK_2 = (1 << 31) - 1;
+var computeNextSeed = function (seed) {
+    return (seed * MULTIPLIER + INCREMENT) & MASK;
+};
+var computeValueFromNextSeed = function (nextseed) {
+    return (nextseed & MASK_2) >> 16;
+};
+var LinearCongruential32 = (function () {
+    function LinearCongruential32(seed) {
+        this.seed = seed;
+    }
+    LinearCongruential32.prototype.clone = function () {
+        return new LinearCongruential32(this.seed);
+    };
+    LinearCongruential32.prototype.next = function () {
+        var nextRng = new LinearCongruential32(this.seed);
+        var out = nextRng.unsafeNext();
+        return [out, nextRng];
+    };
+    LinearCongruential32.prototype.unsafeNext = function () {
+        var s1 = computeNextSeed(this.seed);
+        var v1 = computeValueFromNextSeed(s1);
+        var s2 = computeNextSeed(s1);
+        var v2 = computeValueFromNextSeed(s2);
+        this.seed = computeNextSeed(s2);
+        var v3 = computeValueFromNextSeed(this.seed);
+        var vnext = v3 + ((v2 + (v1 << 15)) << 15);
+        return vnext | 0;
+    };
+    LinearCongruential32.prototype.getState = function () {
+        return [this.seed];
+    };
+    return LinearCongruential32;
+}());
+function fromState(state) {
+    var valid = state.length === 1;
+    if (!valid) {
+        throw new Error('The state must have been produced by a congruential32 RandomGenerator');
+    }
+    return new LinearCongruential32(state[0]);
+}
+export var congruential32 = Object.assign(function (seed) {
+    return new LinearCongruential32(seed);
+}, { fromState: fromState });