Major mondification to how DBC files are handled in-program. Now it is

much more object oriented and encapsulated. The biggest addition is
that it is now possible to support multiple DBC files being loaded at
once with each file associated to one or both buses. Note that
currently the program still does not support multiple DBC files but
the groundwork is there.

dbc_classes.h

@@ -3,6 +3,7 @@
 
 #include <QString>
 #include <QStringList>
+#include "can_structs.h"
 
 /*classes to encapsulate data from a DBC file. Really, the stuff of interest
   are the nodes, messages, signals, attributes, and comments.
@@ -58,7 +59,7 @@ class DBC_MESSAGE; //forward reference so that DBC_SIGNAL can compile before we
 
 class DBC_SIGNAL
 {
-public:
+public: //TODO: this is sloppy. It shouldn't all be public!
     QString name;
     int startBit;
     int signalSize;
@@ -71,24 +72,32 @@ public:
     double bias;
     double min;
     double max;
-    DBC_NODE *receiver;
+    DBC_NODE *receiver; //it is fast to have a pointer but dangerous... Make sure to walk the whole tree and delete everything so nobody has stale references.
     DBC_MESSAGE *parentMessage;
     QString unitName;
     QString comment;
     QList<DBC_ATTRIBUTE> attributes;
     QList<DBC_VAL> valList;
+
+    bool processAsText(const CANFrame &frame, QString &outString);
+    bool processAsInt(const CANFrame &frame, int32_t &outValue);
+    bool processAsDouble(const CANFrame &frame, double &outValue);
 };
 
+class DBCSignalHandler; //forward declaration to keep from having to include dbchandler.h in this file and thus create a loop
+
 class DBC_MESSAGE
 {
 public:
+    DBC_MESSAGE();
+
     int ID;
     QString name;
     QString comment;
     int len;
     DBC_NODE *sender;
     QList<DBC_ATTRIBUTE> attributes;
-    QList<DBC_SIGNAL> msgSignals;
+    DBCSignalHandler *sigHandler;
     DBC_SIGNAL* multiplexorSignal;
 };