LCLS, TS 29.205: add GCR routines

Add functions to encode and decode Global Call Reference as per
3GPP TS 29.205 Table B 2.1.9.1 add corresponding tests.

Change-Id: Iee95aa4e5c056645b6cb5667e4a067097d52dfbf
Related: OS#2487

2 files changed, 112 insertions, 0 deletions

diff --git a/tests/gsm29205/gsm29205_test.c b/tests/gsm29205/gsm29205_test.c
new file mode 100644
index 00000000..5add1b18
--- /dev/null
+++ b/tests/gsm29205/gsm29205_test.c
@@ -0,0 +1,107 @@
+/*
+ * (C) 2018 by sysmocom - s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocom/gsm/gsm29205.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/protocol/gsm_08_08.h>
+#include <osmocom/gsm/gsm0808.h>
+#include <osmocom/gsm/tlv.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/application.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+
+static void test_gcr()
+{
+	static const uint8_t res[] = {
+		0x03, /* .net_len */
+		0x51, 0x52, 0x53, /* .net */
+		0x02, /* .node length */
+		0xde, 0xad, /* .node */
+		0x05, /* length of Call. Ref. */
+		0x41, 0x42, 0x43, 0x44, 0x45 /* .cr - Call. Ref. */
+	};
+	uint8_t len;
+	struct msgb *msg;
+	struct osmo_gcr_parsed p = { 0 }, g = {
+		.net_len = 3,
+		.net = { 0x51, 0x52, 0x53 },
+		.node = 0xDEAD,
+		.cr = { 0x41, 0x42, 0x43, 0x44, 0x45 }
+	};
+	int rc;
+
+	msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "global call reference");
+	if (!msg)
+		return;
+
+	len = osmo_enc_gcr(msg, &g);
+	printf("Testing Global Call Reference encoder...\n\t%d bytes added: %s\n",
+	       len, len == ARRAY_SIZE(res) ? "OK" : "FAIL");
+
+	if (!msgb_eq_data_print(msg, res, ARRAY_SIZE(res)))
+		abort();
+
+	rc = osmo_dec_gcr(&p, msgb_data(msg), msgb_length(msg));
+	if (rc < 0) {
+		printf("decoding failed: %s [%s]\n", strerror(-rc), msgb_hexdump(msg));
+		abort();
+	}
+
+	if (p.net_len != g.net_len) {
+		printf("Network ID length parsed wrong: %u != %u\n", p.net_len, g.net_len);
+		abort();
+	}
+
+	if (p.node != g.node) {
+		printf("Node ID parsed wrong: 0x%X != 0x%X\n", p.node, g.node);
+		abort();
+	}
+
+	if (memcmp(p.net, g.net, g.net_len) != 0) {
+		printf("Network ID parsed wrong: %s\n", osmo_hexdump(p.net, p.net_len));
+		abort();
+	}
+
+	if (memcmp(p.cr, g.cr, 5) != 0) {
+		printf("Call ref. ID parsed wrong: %s\n", osmo_hexdump(p.cr, 5));
+		abort();
+	}
+
+	printf("\tdecoded %d bytes: %s\n", rc, rc == len ? "OK" : "FAIL");
+	msgb_free(msg);
+}
+
+int main(int argc, char **argv)
+{
+	osmo_init_logging2(talloc_named_const(NULL, 0, "gsm29205 test"), NULL);
+
+	printf("Testing 3GPP TS 29.205 routines...\n");
+
+	test_gcr();
+
+	printf("Done.\n");
+
+	return EXIT_SUCCESS;
+}
diff --git a/tests/gsm29205/gsm29205_test.ok b/tests/gsm29205/gsm29205_test.ok
new file mode 100644
index 00000000..bddd88a9
--- /dev/null
+++ b/tests/gsm29205/gsm29205_test.ok
@@ -0,0 +1,5 @@
+Testing 3GPP TS 29.205 routines...
+Testing Global Call Reference encoder...
+	13 bytes added: OK
+	decoded 13 bytes: OK
+Done.