hash: Replace primary hash functions by murmurhash.

[cascardo/ovs.git] / lib / jhash.h

diff --git a/lib/jhash.h b/lib/jhash.h
new file mode 100644 (file)
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--- /dev/null
+++ b/lib/jhash.h
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+/*
+ * Copyright (c) 2008, 2009, 2010, 2012 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JHASH_H
+#define JHASH_H 1
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include "util.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is the public domain lookup3 hash by Bob Jenkins from
+ * http://burtleburtle.net/bob/c/lookup3.c, modified for style.
+ *
+ * Use the functions in hash.h instead if you can.  These are here just for
+ * places where we've exposed a hash function "on the wire" and don't want it
+ * to change. */
+
+uint32_t jhash_words(const uint32_t *, size_t n_word, uint32_t basis);
+uint32_t jhash_bytes(const void *, size_t n_bytes, uint32_t basis);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* jhash.h */