implement xorshift

1 files changed, 24 insertions, 0 deletions

diff --git a/lichen.h b/lichen.h
index e69de29..fe68d52 100644
--- a/lichen.h
+++ b/lichen.h
@@ -0,0 +1,24 @@
+#ifndef LICHEN_H
+#define LICHEN_H
+
+#include <stdint.h>
+
+// random number generation
+typedef struct li_rand32_t {
+  uint32_t (*rand)(void *);
+  void *state;
+} li_rand32_t;
+
+
+struct li_xorshift32_t {
+  li_rand32_t generator;
+  uint64_t state;
+};
+
+// initialize an xorshift32 struct with a specific seed
+void li_xorshift32_seed(struct li_xorshift32_t *xor, uint32_t seed);
+// get a pseudo-random number via the xorshift algorithm
+uint32_t li_xorshift32(void *s);
+
+
+#endif