sms-part-cdma: merge WDP multipart CDMA WAP messages.

CDMA WAPs have multipart message information in a 3 byte header in-band
with the user data, as described in WAP-259-WDP-20010614-a.  Set the
message concat parameters and use the message-id as the reference.

src/mm-sms-part-cdma.c

@@ -13,6 +13,7 @@
  * Copyright (C) 2013 Google, Inc.
  */
 
+#include "mm-sms-part.h"
 #include <ctype.h>
 #include <string.h>
 
@@ -760,6 +761,7 @@ read_bearer_data_message_identifier (MMSmsPart              *sms_part,
     message_id = ((read_bits (&subparameter->parameter_value[0], 4, 8) << 8) |
                   (read_bits (&subparameter->parameter_value[1], 4, 8)));
     message_id = GUINT16_FROM_BE (message_id);
+    mm_sms_part_set_message_id (sms_part, message_id);
     mm_obj_dbg (log_object, "            message id: %u", (guint) message_id);
 
     header_ind = read_bits (&subparameter->parameter_value[2], 4, 1);
@@ -774,6 +776,8 @@ read_bearer_data_user_data (MMSmsPart              *sms_part,
     guint8 message_encoding;
     guint8 message_type = 0;
     guint8 num_fields;
+    guint wdp_total_segments;
+    guint wdp_segment_number;
     guint byte_offset = 0;
     guint bit_offset = 0;
 
@@ -830,6 +834,32 @@ read_bearer_data_user_data (MMSmsPart              *sms_part,
             OFFSETS_UPDATE (8);
         }
 
+        if ((mm_sms_part_get_cdma_teleservice_id (sms_part) == MM_SMS_CDMA_TELESERVICE_ID_WAP) &&
+            (num_fields >= 3) &&
+            (data->data[0] == 0x00)) {
+            /* This is a CDMA WAP WDP message with a segmentation header, as
+             * defined in section 6.5 of WAP-256-WDP-20010614-a */
+            wdp_total_segments = data->data[1];
+            wdp_segment_number = data->data[2];
+            mm_obj_dbg (log_object, "    WAP WDP Payload, segment: %d total: %d", 
+                        wdp_segment_number, wdp_total_segments); 
+
+            /* Use message id as the reference number, since it is the same
+             * across message sets*/
+            mm_sms_part_set_concat_reference (sms_part, mm_sms_part_get_message_id (sms_part));
+            mm_sms_part_set_concat_max (sms_part, wdp_total_segments);
+            /* Segment Number is 0-indexed, concat_sequence expects 1-indexed values */
+            mm_sms_part_set_concat_sequence (sms_part, wdp_segment_number + 1);
+
+            if (wdp_segment_number == 0) {
+                /* Remove the 3 byte segmentation header as well as the 16 bit source and dest port fields */
+                g_byte_array_remove_range (data, 0, 7);
+            } else { 
+                /* Remove segmentation header from additional segments to merge cleanly */
+                g_byte_array_remove_range (data, 0, 3);
+            }
+        }
+
         mm_obj_dbg (log_object, "            data: (%u bytes)", num_fields);
         mm_sms_part_take_data (sms_part, data);
         break;

src/mm-sms-part.c

@@ -41,6 +41,7 @@ struct _MMSmsPart {
     guint validity_relative;
     gboolean delivery_report_request;
     guint message_reference;
+    guint message_id;
     /* NOT a MMSmsDeliveryState, which just includes the known values */
     guint delivery_state;
 
@@ -125,6 +126,8 @@ PART_GET_FUNC (guint, validity_relative)
 PART_SET_FUNC (guint, validity_relative)
 PART_GET_FUNC (gboolean, delivery_report_request)
 PART_SET_FUNC (gboolean, delivery_report_request)
+PART_GET_FUNC (guint, message_id)
+PART_SET_FUNC (guint, message_id)
 PART_GET_FUNC (guint, message_reference)
 PART_SET_FUNC (guint, message_reference)
 PART_GET_FUNC (guint, delivery_state)

src/mm-sms-part.h

@@ -129,6 +129,10 @@ gboolean          mm_sms_part_get_delivery_report_request (MMSmsPart *part);
 void              mm_sms_part_set_delivery_report_request (MMSmsPart *part,
                                                            gboolean delivery_report_request);
 
+guint             mm_sms_part_get_message_id (MMSmsPart *part);
+void              mm_sms_part_set_message_id (MMSmsPart *part,
+                                              guint message_id);
+
 guint             mm_sms_part_get_concat_reference   (MMSmsPart *part);
 void              mm_sms_part_set_concat_reference   (MMSmsPart *part,
                                                       guint concat_reference);