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-rw-r--r--xlators/cluster/dht/src/dht-hashfn.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/xlators/cluster/dht/src/dht-hashfn.c b/xlators/cluster/dht/src/dht-hashfn.c
new file mode 100644
index 000000000..9e321a43c
--- /dev/null
+++ b/xlators/cluster/dht/src/dht-hashfn.c
@@ -0,0 +1,88 @@
+/*
+ Copyright (c) 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
+ This file is part of GlusterFS.
+
+ GlusterFS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3 of the License,
+ or (at your option) any later version.
+
+ GlusterFS is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see
+ <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+
+#include "glusterfs.h"
+#include "xlator.h"
+#include "dht-common.h"
+
+
+uint32_t dht_hashfn_tea (const char *name, int len);
+
+
+typedef enum {
+ DHT_HASH_TYPE_TEA,
+} dht_hashfn_type_t;
+
+
+int
+dht_hash_compute_internal (int type, const char *name, uint32_t *hash_p)
+{
+ int ret = 0;
+ uint32_t hash = 0;
+
+ switch (type) {
+ case DHT_HASH_TYPE_TEA:
+ hash = dht_hashfn_tea (name, strlen (name));
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+
+ if (ret == 0) {
+ *hash_p = hash;
+ }
+
+ return ret;
+}
+
+
+#define MAKE_RSYNC_FRIENDLY_NAME(rsync_frndly_name, name) do { \
+ rsync_frndly_name = (char *) name; \
+ if (name[0] == '.') { \
+ char *dot = 0; \
+ int namelen = 0; \
+ \
+ dot = strrchr (name, '.'); \
+ if (dot && dot > (name + 1) && *(dot + 1)) { \
+ namelen = (dot - name); \
+ rsync_frndly_name = alloca (namelen); \
+ strncpy (rsync_frndly_name, name + 1, \
+ namelen); \
+ rsync_frndly_name[namelen - 1] = 0; \
+ } \
+ } \
+ } while (0);
+
+
+int
+dht_hash_compute (int type, const char *name, uint32_t *hash_p)
+{
+ char *rsync_friendly_name = NULL;
+
+ MAKE_RSYNC_FRIENDLY_NAME (rsync_friendly_name, name);
+
+ return dht_hash_compute_internal (type, rsync_friendly_name, hash_p);
+}