First working version of the direct mode

1 files changed, 49 insertions, 0 deletions

diff --git a/murmurhashneutral2.c b/murmurhashneutral2.c
new file mode 100644
index 00000000..ade30b8b
--- /dev/null
+++ b/murmurhashneutral2.c
@@ -0,0 +1,49 @@
+/*
+ * MurmurHashNeutral2, by Austin Appleby. Released to the public domain. See
+ * <http://murmurhash.googlepages.com>.
+ */
+
+#include "murmurhashneutral2.h"
+
+unsigned int murmurhashneutral2(const void *key, int len, unsigned int seed)
+{
+	const unsigned int m = 0x5bd1e995;
+	const int r = 24;
+
+	unsigned int h = seed ^ len;
+
+	const unsigned char *data = (const unsigned char *)key;
+
+	while (len >= 4) {
+		unsigned int k;
+
+		k  = data[0];
+		k |= data[1] << 8;
+		k |= data[2] << 16;
+		k |= data[3] << 24;
+
+		k *= m;
+		k ^= k >> r;
+		k *= m;
+
+		h *= m;
+		h ^= k;
+
+		data += 4;
+		len -= 4;
+	}
+
+	switch (len)
+	{
+	case 3: h ^= data[2] << 16;
+	case 2: h ^= data[1] << 8;
+	case 1: h ^= data[0];
+	        h *= m;
+	};
+
+	h ^= h >> 13;
+	h *= m;
+	h ^= h >> 15;
+
+	return h;
+}