1 files changed, 47 insertions, 0 deletions
diff --git a/src/libknot/rrtype/naptr.c b/src/libknot/rrtype/naptr.c
new file mode 100644
index 0000000..9307816
--- /dev/null
+++ b/src/libknot/rrtype/naptr.c
@@ -0,0 +1,47 @@
+/*  Copyright (C) 2015 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include "libknot/attribute.h"
+#include "libknot/rrtype/naptr.h"
+#include "contrib/wire_ctx.h"
+
+_public_
+int knot_naptr_header_size(const uint8_t *naptr, const uint8_t *maxp)
+{
+	if (!naptr || !maxp || naptr >= maxp) {
+		return KNOT_EINVAL;
+	}
+
+	wire_ctx_t wire = wire_ctx_init_const(naptr, maxp - naptr);
+
+	/* Fixed fields size (order, preference) */
+	wire_ctx_skip(&wire, 2 * sizeof(uint16_t));
+
+	/* Variable fields size (flags, services, regexp) */
+	for (int i = 0; i < 3; i++) {
+		uint8_t size = wire_ctx_read_u8(&wire);
+		wire_ctx_skip(&wire, size);
+	}
+
+	if (wire.error != KNOT_EOK) {
+		return KNOT_EMALF;
+	}
+
+	return wire_ctx_offset(&wire);
+}