* range specifier is given, then by default the entire object is used.
* <range> ::= <start> "+" <length>
* Both <start> and <length> are decimal values. If included, the range is
- * enclosed in brackets.
+ * enclosed in brackets. As an abbreviation, if <start> is 0 then the range
+ * can be given as just <length> (no "+" needed).
*
* When both a checksum and a range are included, note that the checksum is
* taken over the entire original object, before the range is taken into
* and converted to and from the text representation. */
class ObjectReference {
public:
+ enum RefType { REF_NULL, REF_ZERO, REF_NORMAL };
+
ObjectReference();
+ ObjectReference(RefType t);
ObjectReference(const std::string& segment, int sequence);
ObjectReference(const std::string& segment, const std::string& sequence);
- bool is_null() const { return segment.size() == 0; }
+ bool is_null() const { return type == REF_NULL; }
+ bool is_normal() const { return type == REF_NORMAL; }
std::string to_string() const;
static ObjectReference parse(const std::string& s);
bool merge(ObjectReference ref);
private:
+ RefType type;
std::string segment, object, checksum;
size_t range_start, range_length;
bool checksum_valid, range_valid;