tdb2: make jenkins_hash function non-static, rename to tdb_jenkins_hash.

We're going to need access to it from tdb1_open, so expose it now.
It's better in hash.c anyway.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(Imported from CCAN commit c8f6f8c2dea76042f74c02eff048847e62adcca6)

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/tdb2/hash.c b/lib/tdb2/hash.c
index 1359cfecd6..56c5086e74 100644
--- a/lib/tdb2/hash.c
+++ b/lib/tdb2/hash.c
@@ -16,8 +16,20 @@
    License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 #include "private.h"
+#include <ccan/hash/hash.h>
 #include <assert.h>
 
+/* Default hash function. */
+uint64_t tdb_jenkins_hash(const void *key, size_t length, uint64_t seed,
+			  void *unused)
+{
+	uint64_t ret;
+	/* hash64_stable assumes lower bits are more important; they are a
+	 * slightly better hash.  We use the upper bits first, so swap them. */
+	ret = hash64_stable((const unsigned char *)key, length, seed);
+	return (ret >> 32) | (ret << 32);
+}
+
 uint64_t tdb_hash(struct tdb_context *tdb, const void *ptr, size_t len)
 {
 	return tdb->hash_fn(ptr, len, tdb->hash_seed, tdb->hash_data);