fix:decode: add support for decoding GSM PDU encoding 011.0.2bb

Discovered in portal case #5072165
https://support.multitech.com/support/case.html?action=view&id=72165

2 files changed, 7 insertions, 1 deletions

diff --git a/src/pdu.h b/src/pdu.h
index 60243ec..9e399c9 100644
--- a/src/pdu.h
+++ b/src/pdu.h
@@ -52,6 +52,7 @@ enum {
 //PDU data formats (how the data was represented before encoding)
 enum {
 	PDU_ALPHABET_DEFAULT = 0,      //GSM 7-bit,  (supposedly CDMA 8-bit but haven't seen it)
+	PDU_ALPHABET_DEFAULT2 = 1,     //GSM 7-bit   (used with some shortcodes)
 	PDU_ALPHABET_CDMA_DEFAULT = 2, //no GSM,     CDMA 7-bit
 	PDU_ALPHABET_EIGHT = 4,        //GSM 8-bit,  CDMA 16-bit unicode
 	PDU_ALPHABET_CDMA_EIGHT = 8,   //GSM 16-bit, CDMA 8-bit (what CDMA radios are actually using)
diff --git a/src/pdu_decode.c b/src/pdu_decode.c
index 5acb07b..ebe939e 100644
--- a/src/pdu_decode.c
+++ b/src/pdu_decode.c
@@ -194,7 +194,9 @@ int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octe
   }
 
 
-  if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
+  if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT ||
+      pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT2)
+  {
     log_debug("data coding alphabet is default (7-bit)");
   } else if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI) {
     log_debug("data coding alphabet is default (7-bit) multi-part");
@@ -214,6 +216,7 @@ int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octe
   // VERIFY DATA LENGTH AND GET NUMBER OF OCTETS (ACTUAL DATA BYTES IN PDU STRING)
   // -----------------------------------------------------------------------------
   if ((pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) ||
+      (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT2) ||
         (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI)) {
     if (pdu->user_data_len > PDU_UD_7BIT_MAX) {
       log_warning("pdu contains invalid user-data-len: 0x%02X",
@@ -277,6 +280,7 @@ int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octe
   // ---------------------------------------------------------
   // GSM 7-BIT & LVW2 7-BIT MULTI-PART
   if ((pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) ||
+      (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT2) ||
       (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI)) {
     // Keep UDH for concatenated SMS.
     // Otherwise it is impossible to process correctly concatenated SMS.
@@ -345,6 +349,7 @@ int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octe
   //         (includes LVW2 multi-part)
   // ---------------------------------------------------------------------
   if ((pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) ||
+      (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT2) ||
       (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI)) {
     int read = user_data_start_index;
     int store = user_data_start_index;