1 files changed, 116 insertions, 0 deletions
diff --git a/epan/ptvcursor.c b/epan/ptvcursor.c
new file mode 100644
index 0000000000..cde56022f0
--- /dev/null
+++ b/epan/ptvcursor.c
@@ -0,0 +1,116 @@
+/* ptvcursor.c
+ *
+ * Proto Tree TVBuff cursor
+ * Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.org>
+ * Copyright 2000 Gerald Combs
+ *
+ * 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; either version 2
+ * 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.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "ptvcursor.h"
+
+
+struct ptvcursor {
+	proto_tree	*tree;
+	tvbuff_t	*tvb;
+	gint		offset;
+};
+
+
+/* Allocates an initializes a ptvcursor_t with 3 variables:
+ * 	proto_tree, tvbuff, and offset. */
+ptvcursor_t*
+ptvcursor_new(proto_tree *tree, tvbuff_t *tvb, gint offset)
+{
+	ptvcursor_t	*ptvc;
+
+	ptvc = g_new(ptvcursor_t, 1);
+	ptvc->tree	= tree;
+	ptvc->tvb	= tvb;
+	ptvc->offset	= offset;
+	return ptvc;
+}
+
+
+/* Gets data from tvbuff, adds it to proto_tree, increments offset,
+ * and returns proto_item* */
+proto_item*
+ptvcursor_add(ptvcursor_t *ptvc, int hf, gint length, gboolean endianness)
+{
+	proto_item	*item;
+
+	item = ptvcursor_add_no_advance(ptvc, hf, length, endianness);
+	ptvc->offset += proto_item_get_len(item);
+	return item;
+}
+
+/* Gets data from tvbuff, adds it to proto_tree, *DOES NOT* increment
+ * offset, and returns proto_item* */
+proto_item*
+ptvcursor_add_no_advance(ptvcursor_t* ptvc, int hf, gint length,
+		gboolean endianness)
+{
+	proto_item	*item;
+
+	item = proto_tree_add_item(ptvc->tree, hf, ptvc->tvb, ptvc->offset,
+			length, endianness);
+
+	return item;
+}
+
+/* Advance the ptvcursor's offset within its tvbuff without
+ * adding anything to the proto_tree. */
+void
+ptvcursor_advance(ptvcursor_t* ptvc, gint length)
+{
+	ptvc->offset += length;
+}
+
+/* Frees memory for ptvcursor_t, but nothing deeper than that. */
+void
+ptvcursor_free(ptvcursor_t *ptvc)
+{
+	g_free(ptvc);
+}
+/* Returns tvbuff. */
+tvbuff_t*
+ptvcursor_tvbuff(ptvcursor_t* ptvc)
+{
+	return ptvc->tvb;
+}
+
+/* Returns current offset. */
+gint
+ptvcursor_current_offset(ptvcursor_t* ptvc)
+{
+	return ptvc->offset;
+}
+
+proto_tree*
+ptvcursor_tree(ptvcursor_t* ptvc)
+{
+	return ptvc->tree;
+}
+
+void
+ptvcursor_set_tree(ptvcursor_t* ptvc, proto_tree *tree)
+{
+	ptvc->tree = tree;
+}