modem-helpers: if operator not in UCS2, see if already valid UTF-8

The method doing the operator name normalization takes as input the
current configured modem charset. If this is UCS2, we will now just
assume this is a hint: the string may or may not come in hex/UCS2.

This logic makes the custom operator name loading in Huawei unneeded,
if the modem is configured in UCS2, we still properly process operator
names coming in plain ASCII.

src/tests/test-modem-helpers.c

@@ -865,6 +865,49 @@ test_cops_query (void)
         test_cops_query_data (&cops_query_data[i]);
 }
 
+/*****************************************************************************/
+
+typedef struct {
+    const gchar    *input;
+    MMModemCharset  charset;
+    const gchar    *normalized;
+} NormalizeOperatorTest;
+
+static const NormalizeOperatorTest normalize_operator_tests[] = {
+    /* charset unknown */
+    { "Verizon", MM_MODEM_CHARSET_UNKNOWN, "Verizon" },
+    /* charset configured as IRA (ASCII) */
+    { "Verizon", MM_MODEM_CHARSET_IRA, "Verizon" },
+    /* charset configured as GSM7 */
+    { "Verizon", MM_MODEM_CHARSET_GSM, "Verizon" },
+    /* charset configured as UCS2 */
+    { "0056006500720069007A006F006E", MM_MODEM_CHARSET_UCS2, "Verizon" },
+    { "Verizon",                      MM_MODEM_CHARSET_UCS2, "Verizon" },
+};
+
+static void
+common_test_normalize_operator (const NormalizeOperatorTest *t)
+{
+    gchar *str;
+
+    str = g_strdup (t->input);
+    mm_3gpp_normalize_operator_name (&str, t->charset);
+    if (!t->normalized)
+        g_assert (!str);
+    else
+        g_assert_cmpstr (str, ==, t->normalized);
+    g_free (str);
+}
+
+static void
+test_normalize_operator (void)
+{
+    guint i;
+
+    for (i = 0; i < G_N_ELEMENTS (normalize_operator_tests); i++)
+        common_test_normalize_operator (&normalize_operator_tests[i]);
+}
+
 /*****************************************************************************/
 /* Test CREG/CGREG responses and unsolicited messages */
 
@@ -3527,6 +3570,8 @@ int main (int argc, char **argv)
 
     g_test_suite_add (suite, TESTCASE (test_cops_query, NULL));
 
+    g_test_suite_add (suite, TESTCASE (test_normalize_operator, NULL));
+
     g_test_suite_add (suite, TESTCASE (test_creg1_solicited, reg_data));
     g_test_suite_add (suite, TESTCASE (test_creg1_unsolicited, reg_data));
     g_test_suite_add (suite, TESTCASE (test_creg2_mercury_solicited, reg_data));