Fixed up bug with encode_application_double function.

Added new bacapp_decode_application_data_safe function and other *_safe functions that aim to prevent buffer overruns if encoded application message is malformed.
Note: bacstr unit tests currently have one failure.

bacnet-stack/include/bacdcode.h

@@ -70,6 +70,11 @@ extern "C" {
         uint8_t * apdu,
         uint8_t * tag_number,
         uint32_t * value);
+	int decode_tag_number_and_value_safe(
+		uint8_t *   apdu,
+		uint8_t     apdu_len_remaining,
+		uint8_t *   tag_number,
+		uint32_t *  value);
 /* returns true if the tag is context specific */
     bool decode_is_context_specific(
         uint8_t * apdu);
@@ -171,6 +176,12 @@ extern "C" {
         uint16_t * object_type,
         uint32_t * instance);
 
+	int decode_object_id_safe(
+		uint8_t * apdu,
+		uint32_t len_value,
+		uint16_t * object_type,
+		uint32_t * instance);
+
     int decode_context_object_id(
         uint8_t * apdu,
         uint8_t tag_number,
@@ -316,7 +327,11 @@ extern "C" {
     int decode_bacnet_time(
         uint8_t * apdu,
         BACNET_TIME * btime);
-    int encode_context_time(
+	int decode_bacnet_time_safe(
+		uint8_t * apdu,
+		uint32_t len_value,
+		BACNET_TIME * btime);
+	int encode_context_time(
         uint8_t * apdu,
         uint8_t tag_number,
         BACNET_TIME * btime);
@@ -351,7 +366,11 @@ extern "C" {
     int decode_date(
         uint8_t * apdu,
         BACNET_DATE * bdate);
-    int decode_application_date(
+	int decode_date_safe(
+		uint8_t * apdu,
+		uint32_t len_value,
+		BACNET_DATE * bdate);
+	int decode_application_date(
         uint8_t * apdu,
         BACNET_DATE * bdate);
     int decode_context_date(