add meson support

[protos/libecoli.git] / include / ecoli_murmurhash.h

diff --git a/include/ecoli_murmurhash.h b/include/ecoli_murmurhash.h
new file mode 100644 (file)
index 0000000..6b76d34
--- /dev/null
+++ b/include/ecoli_murmurhash.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2016, Olivier MATZ <zer0@droids-corp.org>
+ */
+
+/**
+ * MurmurHash3 is a hash implementation that was written by Austin Appleby, and
+ * is placed in the public domain. The author hereby disclaims copyright to this
+ * source code.
+ */
+
+#ifndef ECOLI_MURMURHASH_H_
+#define ECOLI_MURMURHASH_H_
+
+#include <stdint.h>
+
+/** Hash rotation */
+static inline uint32_t ec_murmurhash_rotl32(uint32_t x, int8_t r)
+{
+       return (x << r) | (x >> (32 - r));
+}
+
+/** Add 32-bit to the hash */
+static inline uint32_t ec_murmurhash3_add32(uint32_t h, uint32_t data)
+{
+       data *= 0xcc9e2d51;
+       data = ec_murmurhash_rotl32(data, 15);
+       data *= 0x1b873593;
+       h ^= data;
+       return h;
+}
+
+/** Intermediate mix */
+static inline uint32_t ec_murmurhash3_mix32(uint32_t h)
+{
+       h = ec_murmurhash_rotl32(h,13);
+       h = h * 5 +0xe6546b64;
+       return h;
+}
+
+/** Final mix: force all bits of a hash block to avalanche */
+static inline uint32_t ec_murmurhash3_fmix32(uint32_t h)
+{
+       h ^= h >> 16;
+       h *= 0x85ebca6b;
+       h ^= h >> 13;
+       h *= 0xc2b2ae35;
+       h ^= h >> 16;
+
+       return h;
+}
+
+/**
+ * Calculate a 32-bit murmurhash3
+ *
+ * @param key
+ *   The key (the unaligned variable-length array of bytes).
+ * @param len
+ *   The length of the key, counting by bytes.
+ * @param seed
+ *   Can be any 4-byte value initialization value.
+ * @return
+ *   A 32-bit hash.
+ */
+uint32_t ec_murmurhash3(const void *key, int len, uint32_t seed);
+
+#endif /* ECOLI_MURMURHASH_H_ */