1 files changed, 54 insertions, 0 deletions
diff --git a/src/util-hash-string.c b/src/util-hash-string.c
new file mode 100644
index 0000000..baa5ec4
--- /dev/null
+++ b/src/util-hash-string.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2007-2017 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "suricata-common.h"
+#include "util-hash-string.h"
+
+/* djb2 string hashing */
+uint32_t StringHashDjb2(const uint8_t *data, uint32_t datalen)
+{
+    uint32_t hash = 5381;
+    for (uint32_t i = 0; i < datalen; i++) {
+        uint32_t c = data[i];
+        hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
+    }
+    return hash;
+}
+
+/* djb2 string hashing */
+uint32_t StringHashFunc(HashTable *ht, void *data, uint16_t datalen)
+{
+    return StringHashDjb2(data, datalen) % ht->array_size;
+}
+
+char StringHashCompareFunc(void *data1, uint16_t datalen1,
+                           void *data2, uint16_t datalen2)
+{
+    int len1 = strlen((char *)data1);
+    int len2 = strlen((char *)data2);
+
+    if (len1 == len2 && memcmp(data1, data2, len1) == 0) {
+        return 1;
+    }
+
+    return 0;
+}
+
+void StringHashFreeFunc(void *data)
+{
+    SCFree(data);
+}