KawPow WIP

src/3rdparty/libethash/fnv.h

@@ -0,0 +1,42 @@
+/*
+  This file is part of cpp-ethereum.
+
+  cpp-ethereum is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  cpp-ethereum is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file fnv.h
+* @author Matthew Wampler-Doty <negacthulhu@gmail.com>
+* @date 2015
+*/
+
+#pragma once
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FNV_PRIME 0x01000193
+
+/* The FNV-1 spec multiplies the prime with the input one byte (octet) in turn.
+   We instead multiply it with the full 32-bit input.
+   This gives a different result compared to a canonical FNV-1 implementation.
+*/
+static inline uint32_t fnv_hash(uint32_t const x, uint32_t const y)
+{
+	return x * FNV_PRIME ^ y;
+}
+
+#ifdef __cplusplus
+}
+#endif