Added check for zero length buffer size in primitive decoders that returns zero to enable simpler complex value optional element decoding. (#876)

src/bacnet/bacdevobjpropref.h

@@ -43,7 +43,7 @@ typedef struct BACnetDeviceObjectReference {
  *      -- if omitted with an array the entire array is referenced
  * }
  */
-typedef struct BACnet_Object_Property_Reference {
+typedef struct BACnetObjectPropertyReference {
     /* note: use type = OBJECT_NONE for unused reference */
     BACNET_OBJECT_ID object_identifier;
     BACNET_PROPERTY_ID property_identifier;
@@ -51,6 +51,19 @@ typedef struct BACnet_Object_Property_Reference {
     BACNET_ARRAY_INDEX property_array_index;
 } BACNET_OBJECT_PROPERTY_REFERENCE;
 
+/**
+ * BACnetPropertyReference ::= SEQUENCE {
+ *      propertyIdentifier      [0] BACnetPropertyIdentifier,
+ *      propertyArrayIndex      [1] Unsigned OPTIONAL
+ *      -- used only with array datatype
+ *      -- if omitted with an array the entire array is referenced
+ * }
+ */
+struct BACnetPropertyReference {
+    BACNET_PROPERTY_ID property_identifier;
+    BACNET_ARRAY_INDEX property_array_index;
+};
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
@@ -161,6 +174,30 @@ bool bacnet_object_property_reference_same(
     const BACNET_OBJECT_PROPERTY_REFERENCE *value1,
     const BACNET_OBJECT_PROPERTY_REFERENCE *value2);
 
+BACNET_STACK_EXPORT
+int bacnet_property_reference_encode(
+    uint8_t *apdu, const struct BACnetPropertyReference *reference);
+BACNET_STACK_EXPORT
+int bacnet_property_reference_context_encode(
+    uint8_t *apdu,
+    uint8_t tag_number,
+    const struct BACnetPropertyReference *reference);
+BACNET_STACK_EXPORT
+bool bacnet_property_reference_same(
+    const struct BACnetPropertyReference *value1,
+    const struct BACnetPropertyReference *value2);
+BACNET_STACK_EXPORT
+int bacnet_property_reference_decode(
+    const uint8_t *apdu,
+    uint32_t apdu_size,
+    struct BACnetPropertyReference *value);
+BACNET_STACK_EXPORT
+int bacnet_property_reference_context_decode(
+    const uint8_t *apdu,
+    uint32_t apdu_size,
+    uint8_t tag_number,
+    struct BACnetPropertyReference *value);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */