Removed the ambiguous session_get0_current_payload() API. It is unclear whether the original packet payload or TCP reassembled payload is obtained.

It is recommended to:
* Use packet_get_payload() to obtain the original packet payload
* Use tcp_segment_get_data() to obtain the reassembled data

src/tcp_reassembly/tcp_reassembly.cpp

@@ -251,4 +251,28 @@ uint32_t tcp_reassembly_get_recv_next(struct tcp_reassembly *assembler)
     }
 
     return assembler->recv_next;
+}
+
+const char *tcp_segment_get_data(const struct tcp_segment *seg)
+{
+    if (seg == NULL)
+    {
+        return NULL;
+    }
+    else
+    {
+        return (const char *)seg->data;
+    }
+}
+
+uint16_t tcp_segment_get_len(const struct tcp_segment *seg)
+{
+    if (seg == NULL)
+    {
+        return 0;
+    }
+    else
+    {
+        return seg->len;
+    }
 }