gsm: Add APN conversion functions
These functions are currently part of openbsc but also needed by
other projects.
The function have been renamed as follows:
gprs_apn_to_str -> osmo_apn_to_str
gprs_str_to_apn -> osmo_apn_from_str
Sponsored-by: On-Waves ehf
diff --git a/tests/gprs/gprs_test.c b/tests/gprs/gprs_test.c
new file mode 100644
index 0000000..be80e5c
--- /dev/null
+++ b/tests/gprs/gprs_test.c
@@ -0,0 +1,122 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/gsm/apn.h>
+
+static void apn_round_trip(const uint8_t *input, size_t len, const char *wanted_output)
+{
+ char output[len ? len : 1];
+ uint8_t encoded[len + 50];
+ char *out_str;
+ int enc_len;
+
+ /* decode and verify we have what we want */
+ out_str = osmo_apn_to_str(output, input, len);
+ OSMO_ASSERT(out_str);
+ OSMO_ASSERT(out_str == &output[0]);
+ OSMO_ASSERT(strlen(out_str) == strlen(wanted_output));
+ OSMO_ASSERT(strcmp(out_str, wanted_output) == 0);
+
+ /* encode and verify it */
+ if (len != 0) {
+ enc_len = osmo_apn_from_str(encoded, ARRAY_SIZE(encoded), wanted_output);
+ OSMO_ASSERT(enc_len == len);
+ OSMO_ASSERT(memcmp(encoded, input, enc_len) == 0);
+ } else {
+ enc_len = osmo_apn_from_str(encoded, 0, wanted_output);
+ OSMO_ASSERT(enc_len == -1);
+ }
+}
+
+static void test_gsm_03_03_apn(void)
+{
+
+ {
+ /* test invalid writes */
+ const uint8_t ref[10] = { 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF };
+ uint8_t output[10];
+ int enc_len;
+
+ memcpy(output, ref, ARRAY_SIZE(output));
+ enc_len = osmo_apn_from_str(output, 0, "");
+ OSMO_ASSERT(enc_len == -1);
+ OSMO_ASSERT(memcmp(ref, output, ARRAY_SIZE(ref)) == 0);
+
+ memcpy(output, ref, ARRAY_SIZE(output));
+ enc_len = osmo_apn_from_str(output, 0, "foo");
+ OSMO_ASSERT(enc_len == -1);
+ OSMO_ASSERT(memcmp(ref, output, ARRAY_SIZE(ref)) == 0);
+
+ memcpy(output, ref, ARRAY_SIZE(output));
+ enc_len = osmo_apn_from_str(output, 1, "foo");
+ OSMO_ASSERT(enc_len == -1);
+ OSMO_ASSERT(memcmp(ref + 1, output + 1, ARRAY_SIZE(ref) - 1) == 0);
+
+ memcpy(output, ref, ARRAY_SIZE(output));
+ enc_len = osmo_apn_from_str(output, 2, "foo");
+ OSMO_ASSERT(enc_len == -1);
+ OSMO_ASSERT(memcmp(ref + 2, output + 2, ARRAY_SIZE(ref) - 2) == 0);
+
+ memcpy(output, ref, ARRAY_SIZE(output));
+ enc_len = osmo_apn_from_str(output, 3, "foo");
+ OSMO_ASSERT(enc_len == -1);
+ OSMO_ASSERT(memcmp(ref + 3, output + 3, ARRAY_SIZE(ref) - 3) == 0);
+ }
+
+ {
+ /* single empty label */
+ uint8_t input[] = { 0x0 };
+ const char *output = "";
+ apn_round_trip(input, ARRAY_SIZE(input), output);
+ }
+
+ {
+ /* no label */
+ uint8_t input[] = { };
+ const char *output = "";
+ apn_round_trip(input, ARRAY_SIZE(input), output);
+ }
+
+ {
+ /* single label with A */
+ uint8_t input[] = { 0x1, 65 };
+ const char *output = "A";
+ apn_round_trip(input, ARRAY_SIZE(input), output);
+ OSMO_ASSERT(osmo_apn_to_str(NULL, input, ARRAY_SIZE(input) - 1) == NULL);
+ }
+
+ {
+ uint8_t input[] = { 0x3, 65, 66, 67, 0x2, 90, 122 };
+ const char *output = "ABC.Zz";
+ char tmp[strlen(output) + 1];
+ apn_round_trip(input, ARRAY_SIZE(input), output);
+ OSMO_ASSERT(osmo_apn_to_str(tmp, input, ARRAY_SIZE(input) - 1) == NULL);
+ OSMO_ASSERT(osmo_apn_to_str(tmp, input, ARRAY_SIZE(input) - 2) == NULL);
+ OSMO_ASSERT(osmo_apn_to_str(tmp, input, ARRAY_SIZE(input) - 4) == NULL);
+ OSMO_ASSERT(osmo_apn_to_str(tmp, input, ARRAY_SIZE(input) - 5) == NULL);
+ OSMO_ASSERT(osmo_apn_to_str(tmp, input, ARRAY_SIZE(input) - 6) == NULL);
+ }
+}
+
+const struct log_info_cat default_categories[] = {
+};
+
+static struct log_info info = {
+ .cat = default_categories,
+ .num_cat = ARRAY_SIZE(default_categories),
+};
+
+int main(int argc, char **argv)
+{
+ osmo_init_logging(&info);
+
+ test_gsm_03_03_apn();
+
+ printf("Done.\n");
+ return EXIT_SUCCESS;
+}