progminer zano miner fork https://github.com/hyle-team/progminer

zano/libethash/primes.h

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+/* ethash: C/C++ implementation of Ethash, the Ethereum Proof of Work algorithm.
+ * Copyright 2018 Pawel Bylica.
+ * Licensed under the Apache License, Version 2.0. See the LICENSE file.
+ */
+
+#pragma once
+
+#include <ethash/ethash.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Finds the largest prime number not greater than the provided upper bound.
+ *
+ * @param upper_bound  The upper bound. SHOULD be greater than 1.
+ * @return  The largest prime number `p` such `p <= upper_bound`.
+ *          In case `upper_bound <= 1`, returns 0.
+ */
+int ethash_find_largest_prime(int upper_bound) NOEXCEPT;
+
+#ifdef __cplusplus
+}
+#endif