Create xorshift.py

src/xorshift.py

@@ -0,0 +1,56 @@
+class Xorshift(object):
+    def __init__(self,s0,s1,s2,s3):
+        self.x = s0
+        self.y = s1
+        self.z = s2
+        self.w = s3
+
+    def next(self):
+        s0 = self.x
+        s1 = self.y
+        s2 = self.z
+        s3 = self.w
+
+        tmp = s0 ^ s0 << 11
+        self.x = s1
+        self.y = s2
+        self.z = s3
+        self.w = t ^ t >>8 ^ s3 ^ s3 >> 19
+
+        return self.w
+
+    def prev(self):
+        s0 = self.x
+        s1 = self.y
+        s2 = self.z
+        s3 = self.w
+
+        t = s2 >> 19 ^ s2 ^ s3
+        t ^= t >> 8
+        t ^= t << 11
+        t ^= t << 22
+
+        self.x = t
+        self.y = s0
+        self.z = s1
+        self.w = s2
+
+        return self.w
+
+    def range(mi,ma):
+        return self.next() % (ma-mi) + min
+
+    def getNextRandSequence(length):
+        return [self.next() for _ in range(length)]
+
+    def getPrevRandSequence(length):
+        return [self.prev() for _ in range(length)]
+
+    def getState(self):
+        return [self.x, self.y, self.z, self.w]
+
+    def setState(self, s0, s1, s2, s3):
+        self.x = s0
+        self.y = s1
+        self.z = s2
+        self.w = s3