X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Fhash.c;h=56c5086e742552480a23e81a8e2a7baafe583d73;hp=1359cfecd66dc6280e3314e78fd2e7e5ea91c8bd;hb=c8f6f8c2dea76042f74c02eff048847e62adcca6;hpb=97224cbbe29e76522ec38d031c54b1cadce8ae03

diff --git a/ccan/tdb2/hash.c b/ccan/tdb2/hash.c
index 1359cfec..56c5086e 100644
--- a/ccan/tdb2/hash.c
+++ b/ccan/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);