-/* LBS: An LFS-inspired filesystem backup system
- * Copyright (C) 2007 Michael Vrable
+/* Cumulus: Smart Filesystem Backup to Dumb Servers
*
- * Backups are structured as a collection of objects, which may refer to other
+ * Copyright (C) 2007-2008 The Regents of the University of California
+ * Written by Michael Vrable <mvrable@cs.ucsd.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Backups are structured as a collection of objects, which may refer to other
* objects. Object references are used to name other objects or parts of them.
* This file defines the class for representing object references and the
* textual representation of these references. */
* 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 type == REF_NULL; }
+ bool is_normal() const { return type == REF_NORMAL; }
std::string to_string() const;
- static ObjectReference *parse(const std::string& s);
+ static ObjectReference parse(const std::string& s);
std::string get_segment() const { return segment; }
std::string get_sequence() const { return object; }
void set_range(size_t start, size_t length)
{ range_start = start; range_length = length; range_valid = true; }
+ bool merge(ObjectReference ref);
+
private:
+ RefType type;
std::string segment, object, checksum;
size_t range_start, range_length;
bool checksum_valid, range_valid;