src/sn_{network,stage,comparator}.[ch]: Implement sn_network_get_hashval() and friends.

[sort-networks.git] / src / sn_stage.c

diff --git a/src/sn_stage.c b/src/sn_stage.c
index ae61578..1b564cc 100644 (file)
--- a/src/sn_stage.c
+++ b/src/sn_stage.c
@@ -2,18 +2,19 @@
  * libsortnetwork - src/sn_stage.c
  * Copyright (C) 2008-2010  Florian octo Forster
  *
- * This program 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; only version 2 of the License is applicable.
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
  *
- * This program 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.
+ * This library 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 Lesser General Public License
+ * for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  * Authors:
  *   Florian octo Forster <ff at octo.it>
@@ -607,4 +608,20 @@ sn_stage_t *sn_stage_unserialize (char **ret_buffer, size_t *ret_buffer_size)
   return (s);
 } /* sn_stage_t *sn_stage_unserialize */
 
-/* vim: set shiftwidth=2 softtabstop=2 expandtab : */
+uint32_t sn_stage_get_hashval (const sn_stage_t *s) /* {{{ */
+{
+  uint32_t hash;
+  int i;
+
+  if (s == NULL)
+    return (0);
+
+  hash = (uint32_t) s->depth;
+
+  for (i = 0; i < s->comparators_num; i++)
+    hash = (hash * 99991) + sn_comparator_get_hashval (s->comparators + i);
+
+  return (hash);
+} /* }}} uint32_t sn_stage_get_hashval */
+
+/* vim: set shiftwidth=2 softtabstop=2 expandtab fdm=marker : */