Provide GJRAND64Random

gradle.properties

@@ -4,7 +4,7 @@ kotlin.code.style=official
 specifyKotlinAsDependency=false
 
 projectGroup=ru.dbotthepony.kommons
-projectVersion=3.4.0
+projectVersion=3.5.0
 
 guavaDepVersion=33.0.0
 gsonDepVersion=2.8.9

src/main/kotlin/ru/dbotthepony/kommons/random/GJRAND64Random.kt

@@ -0,0 +1,41 @@
+package ru.dbotthepony.kommons.random
+
+import java.util.random.RandomGenerator
+
+/**
+ * From [gjrand website](https://gjrand.sourceforge.net):
+ *
+ * The gjrand project is about pseudo-random number generation for the purpose of simulations,
+ * Monte-Carlo integration, computer games and the like. It is intended that statistical
+ * properties be extremely good for such purposes. However, gjrand is not suitable as a
+ * high security random number generator for cryptography, the state lottery draw, etc.
+ */
+open class GJRAND64Random protected constructor(
+	@JvmField
+	protected var s0: Long,
+	@JvmField
+	protected var s1: Long,
+	@JvmField
+	protected var s2: Long,
+	@JvmField
+	protected var s3: Long,
+	marker: Nothing?
+) : RandomGenerator {
+	constructor(seed0: Long, seed1: Long) : this(seed0, seed1, 2000001L, 0L, null)
+	constructor(seed: Long) : this(seed, 0L)
+
+	final override fun nextLong(): Long {
+		s1 += s2
+		s0 = s0.rotateLeft(32)
+		s2 = s2 xor s1
+		s3 += 0x55aa96a5L
+		s0 += s1
+		s2 = s2.rotateLeft(23)
+		s1 = s1 xor s0
+		s0 += s2
+		s1 = s1.rotateLeft(19)
+		s2 += s0
+		s1 += s3
+		return s0
+	}
+}