libmm-glib,common-helpers: make hexstr2bin() return a guint8 array

It makes much more sense than returning a gchar array, as gchar is
signed.

src/mm-base-sim.c

@@ -1306,9 +1306,9 @@ parse_mnc_length (const gchar *response,
         (sw1 == 0x91) ||
         (sw1 == 0x92) ||
         (sw1 == 0x9f)) {
-        gsize             buflen = 0;
-        guint32           mnc_len;
-        g_autofree gchar *bin = NULL;
+        gsize              buflen = 0;
+        guint32            mnc_len;
+        g_autofree guint8 *bin = NULL;
 
         /* Convert hex string to binary */
         bin = mm_utils_hexstr2bin (hex, -1, &buflen, error);
@@ -1323,7 +1323,7 @@ parse_mnc_length (const gchar *response,
         }
 
         /* MNC length is byte 4 of this SIM file */
-        mnc_len = bin[3] & 0xFF;
+        mnc_len = bin[3];
         if (mnc_len == 2 || mnc_len == 3)
             return mnc_len;
 
@@ -1412,8 +1412,8 @@ parse_spn (const gchar *response,
         (sw1 == 0x91) ||
         (sw1 == 0x92) ||
         (sw1 == 0x9f)) {
-        gsize             buflen = 0;
-        g_autofree gchar *bin = NULL;
+        gsize              buflen = 0;
+        g_autofree guint8 *bin = NULL;
 
         /* Convert hex string to binary */
         bin = mm_utils_hexstr2bin (hex, -1, &buflen, error);
@@ -1423,11 +1423,11 @@ parse_spn (const gchar *response,
         }
 
         /* Remove the FF filler at the end */
-        while (buflen > 1 && bin[buflen - 1] == (char)0xff)
+        while (buflen > 1 && bin[buflen - 1] == 0xff)
             buflen--;
 
         /* First byte is metadata; remainder is GSM-7 unpacked into octets; convert to UTF8 */
-        return (gchar *)mm_charset_gsm_unpacked_to_utf8 ((guint8 *)bin + 1, buflen - 1);
+        return (gchar *)mm_charset_gsm_unpacked_to_utf8 (bin + 1, buflen - 1);
     }
 
     g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,

src/mm-charsets.c

@@ -157,11 +157,11 @@ gchar *
 mm_modem_charset_hex_to_utf8 (const gchar    *src,
                               MMModemCharset  charset)
 {
-    const gchar      *iconv_from;
-    g_autofree gchar *unconverted = NULL;
-    g_autofree gchar *converted = NULL;
-    g_autoptr(GError) error = NULL;
-    gsize             unconverted_len = 0;
+    const gchar       *iconv_from;
+    g_autofree guint8 *unconverted = NULL;
+    g_autofree gchar  *converted = NULL;
+    g_autoptr(GError)  error = NULL;
+    gsize              unconverted_len = 0;
 
     g_return_val_if_fail (src != NULL, NULL);
     g_return_val_if_fail (charset != MM_MODEM_CHARSET_UNKNOWN, NULL);
@@ -176,7 +176,7 @@ mm_modem_charset_hex_to_utf8 (const gchar    *src,
     if (charset == MM_MODEM_CHARSET_UTF8 || charset == MM_MODEM_CHARSET_IRA)
         return g_steal_pointer (&unconverted);
 
-    converted = g_convert (unconverted, unconverted_len,
+    converted = g_convert ((const gchar *)unconverted, unconverted_len,
                            "UTF-8//TRANSLIT", iconv_from,
                            NULL, NULL, &error);
     if (!converted || error)

src/mm-modem-helpers-qmi.c

@@ -1815,7 +1815,7 @@ mm_firmware_unique_id_to_qmi_unique_id (const gchar  *unique_id,
         gsize              tmp_len;
 
         tmp_len = 0;
-        tmp = (guint8 *) mm_utils_hexstr2bin (unique_id, -1, &tmp_len, error);
+        tmp = mm_utils_hexstr2bin (unique_id, -1, &tmp_len, error);
         if (!tmp) {
             g_prefix_error (error, "Unexpected character found in unique id: ");
             return NULL;

src/mm-modem-helpers.c

@@ -4291,7 +4291,7 @@ mm_3gpp_parse_emergency_numbers (const char *raw, GError **error)
         return NULL;
     }
 
-    bin = (guint8 *) mm_utils_hexstr2bin (raw, -1, &binlen, error);
+    bin = mm_utils_hexstr2bin (raw, -1, &binlen, error);
     if (!bin) {
         g_prefix_error (error, "invalid raw emergency numbers list contents: ");
         return NULL;

src/mm-sms-part-3gpp.c

@@ -343,7 +343,7 @@ mm_sms_part_3gpp_new_from_pdu (guint         index,
     gsize              pdu_len;
 
     /* Convert PDU from hex to binary */
-    pdu = (guint8 *) mm_utils_hexstr2bin (hexpdu, -1, &pdu_len, error);
+    pdu = mm_utils_hexstr2bin (hexpdu, -1, &pdu_len, error);
     if (!pdu) {
         g_prefix_error (error, "Couldn't convert 3GPP PDU from hex to binary: ");
         return NULL;

src/mm-sms-part-cdma.c

@@ -321,7 +321,7 @@ mm_sms_part_cdma_new_from_pdu (guint         index,
     gsize              pdu_len;
 
     /* Convert PDU from hex to binary */
-    pdu = (guint8 *) mm_utils_hexstr2bin (hexpdu, -1, &pdu_len, error);
+    pdu = mm_utils_hexstr2bin (hexpdu, -1, &pdu_len, error);
     if (!pdu) {
         g_prefix_error (error, "Couldn't convert CDMA PDU from hex to binary: ");
         return NULL;