1 files changed, 93 insertions, 0 deletions
diff --git a/modules/luci-base/htdocs/luci-static/resources/tools/prng.js b/modules/luci-base/htdocs/luci-static/resources/tools/prng.js
new file mode 100644
index 0000000000..752dc75ce8
--- /dev/null
+++ b/modules/luci-base/htdocs/luci-static/resources/tools/prng.js
@@ -0,0 +1,93 @@
+'use strict';
+
+var s = [0x0000, 0x0000, 0x0000, 0x0000];
+
+function mul(a, b) {
+	var r = [0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000];
+
+	for (var j = 0; j < 4; j++) {
+		var k = 0;
+		for (var i = 0; i < 4; i++) {
+			var t = a[i] * b[j] + r[i+j] + k;
+			r[i+j] = t & 0xffff;
+			k = t >>> 16;
+		}
+		r[j+4] = k;
+	}
+
+	r.length = 4;
+
+	return r;
+}
+
+function add(a, n) {
+	var r = [0x0000, 0x0000, 0x0000, 0x0000],
+	    k = n;
+
+	for (var i = 0; i < 4; i++) {
+		var t = a[i] + k;
+		r[i] = t & 0xffff;
+		k = t >>> 16;
+	}
+
+	return r;
+}
+
+function shr(a, n) {
+	var r = [a[0], a[1], a[2], a[3], 0x0000],
+	    i = 4,
+	    k = 0;
+
+	for (; n > 16; n -= 16, i--)
+		for (var j = 0; j < 4; j++)
+			r[j] = r[j+1];
+
+	for (; i > 0; i--) {
+		var s = r[i-1];
+		r[i-1] = (s >>> n) | k;
+		k = ((s & ((1 << n) - 1)) << (16 - n));
+	}
+
+	r.length = 4;
+
+	return r;
+}
+
+return L.Class.extend({
+	seed: function(n) {
+		n = (n - 1)|0;
+		s[0] = n & 0xffff;
+		s[1] = n >>> 16;
+		s[2] = 0;
+		s[3] = 0;
+	},
+
+	int: function() {
+		s = mul(s, [0x7f2d, 0x4c95, 0xf42d, 0x5851]);
+		s = add(s, 1);
+
+		var r = shr(s, 33);
+		return (r[1] << 16) | r[0];
+	},
+
+	get: function() {
+		var r = (this.int() % 0x7fffffff) / 0x7fffffff, l, u;
+
+		switch (arguments.length) {
+		case 0:
+			return r;
+
+		case 1:
+			l = 1;
+			u = arguments[0]|0;
+			break;
+
+		case 2:
+			l = arguments[0]|0;
+			u = arguments[1]|0;
+			break;
+		}
+
+		return Math.floor(r * (u - l + 1)) + l;
+	}
+});