From d5696eb56e4fc6a5d2737fb12710660005d20d81 Mon Sep 17 00:00:00 2001
From: Oliver Smith <osmith@sysmocom.de>
Date: Wed, 29 Jan 2020 14:58:21 +0100
Subject: [PATCH] library/DNS_Helpers: add f_enc_IPv4

Used by upcoming D-GSM test, to pass the IP of the emulated GSUP server.
The code is based on f_enc_dns_hostname() in the same file.

Related: OS#4380
Change-Id: I8a5450988711680c93cfd657a34db759a56bc41e
---
 library/DNS_Helpers.ttcn | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/library/DNS_Helpers.ttcn b/library/DNS_Helpers.ttcn
index 122adff3c..85040fc28 100644
--- a/library/DNS_Helpers.ttcn
+++ b/library/DNS_Helpers.ttcn
@@ -70,4 +70,27 @@ function f_dec_dns_hostname(octetstring inp) return charstring {
 }
 
 
+function f_enc_IPv4(charstring str) return octetstring {
+	var octetstring ret := ''O;
+
+	while (lengthof(str) > 0) {
+		var integer dot_idx;
+		var charstring num;
+
+		dot_idx := f_strchr(str, ".");
+		if (dot_idx >= 0) {
+			/* there is another dot */
+			num := substr(str, 0, dot_idx);
+			str := substr(str, dot_idx+1, lengthof(str)-dot_idx-1);
+		} else {
+			/* no more dot */
+			num := str;
+			str := "";
+		}
+		ret := ret & int2oct(str2int(num), 1);
+	}
+
+	return ret;
+}
+
 }