-/* LBS: An LFS-inspired filesystem backup system
- * Copyright (C) 2007 Michael Vrable
+/* Cumulus: Efficient Filesystem Backup to the Cloud
+ * Copyright (C) 2007-2008 The Cumulus Developers
+ * See the AUTHORS file for a list of contributors.
*
- * Backups are structured as a collection of objects, which may refer to other
+ * 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. */
#include <assert.h>
#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
#include <uuid/uuid.h>
#include <string>
}
ObjectReference::ObjectReference()
- : segment(""), object("")
+ : type(REF_NULL), segment(""), object("")
+{
+ clear_checksum();
+ clear_range();
+}
+
+ObjectReference::ObjectReference(RefType t)
+ : type(t), segment(""), object("")
{
+ clear_checksum();
+ clear_range();
}
ObjectReference::ObjectReference(const std::string& segment, int sequence)
- : segment(segment)
+ : type(REF_NORMAL), segment(segment)
{
char seq_buf[64];
sprintf(seq_buf, "%08x", sequence);
ObjectReference::ObjectReference(const std::string& segment,
const std::string& sequence)
- : segment(segment), object(sequence)
+ : type(REF_NORMAL), segment(segment), object(sequence)
{
clear_checksum();
clear_range();
string ObjectReference::to_string() const
{
- if (is_null())
- return "/";
+ if (type == REF_NULL)
+ return "null";
- string result = segment + "/" + object;
+ string result;
+ if (type == REF_ZERO) {
+ result = "zero";
+ } else if (type == REF_NORMAL) {
+ result = segment + "/" + object;
- if (checksum_valid)
- result += "(" + checksum + ")";
+ if (checksum_valid)
+ result += "(" + checksum + ")";
+ }
if (range_valid) {
char buf[64];
- sprintf(buf, "[%zu+%zu]", range_start, range_length);
+ if (range_exact || type == REF_ZERO) {
+ sprintf(buf, "[%zu]", range_length);
+ } else {
+ sprintf(buf, "[%zu+%zu]", range_start, range_length);
+ }
result += buf;
}
{
const char *s = str.c_str();
const char *t;
+ ObjectReference::RefType type = ObjectReference::REF_NORMAL;
+
+ // Special case: explicit zero objects
+ if (strncmp(s, "zero", 4) == 0) {
+ type = ObjectReference::REF_ZERO;
+ s += 4;
+ }
// Segment
t = s;
- while ((*t >= '0' && *t <= '9') || (*t >= 'a' && *t <= 'f') || (*t == '-'))
- t++;
- if (*t != '/')
- return ObjectReference();
+ if (type == ObjectReference::REF_NORMAL) {
+ while ((*t >= '0' && *t <= '9') || (*t >= 'a' && *t <= 'f')
+ || (*t == '-'))
+ t++;
+ if (*t != '/')
+ return ObjectReference();
+ }
string segment(s, t - s);
// Object sequence number
- t++;
- s = t;
- while ((*t >= '0' && *t <= '9') || (*t >= 'a' && *t <= 'f'))
+ if (type == ObjectReference::REF_NORMAL) {
t++;
- if (*t != '\0' && *t != '(' && *t != '[')
- return ObjectReference();
+ s = t;
+ while ((*t >= '0' && *t <= '9') || (*t >= 'a' && *t <= 'f'))
+ t++;
+ if (*t != '\0' && *t != '(' && *t != '[')
+ return ObjectReference();
+ }
string object(s, t - s);
// Checksum
}
// Range
- bool have_range = false;
- int64_t range1, range2;
+ bool have_range = false, range_exact = false;
+ int64_t range1 = 0, range2 = 0;
if (*t == '[') {
t++;
+
+ // An equal sign was once used for a length assertion but is now
+ // deprecated. Skip it if present, and mark that we are expecting a
+ // length-only reference.
+ if (*t == '=') {
+ range_exact = true;
+ t++;
+ }
+
s = t;
while (*t >= '0' && *t <= '9')
t++;
- if (*t != '+')
- return ObjectReference();
- string val(s, t - s);
- range1 = atoll(val.c_str());
+ // Abbreviated-length only range?
+ if (*t == ']') {
+ string val(s, t - s);
+ range2 = atoll(val.c_str());
+ range_exact = true;
+ } else {
+ if (*t != '+')
+ return ObjectReference();
+ if (range_exact)
+ return ObjectReference();
+
+ string val(s, t - s);
+ range1 = atoll(val.c_str());
- t++;
- s = t;
- while (*t >= '0' && *t <= '9')
t++;
- if (*t != ']')
- return ObjectReference();
+ s = t;
+ while (*t >= '0' && *t <= '9')
+ t++;
+ if (*t != ']')
+ return ObjectReference();
- val = string(s, t - s);
- range2 = atoll(val.c_str());
+ val = string(s, t - s);
+ range2 = atoll(val.c_str());
+ }
have_range = true;
}
- ObjectReference ref(segment, object);
+ ObjectReference ref;
+ switch (type) {
+ case ObjectReference::REF_ZERO:
+ ref = ObjectReference(ObjectReference::REF_ZERO);
+ break;
+ case ObjectReference::REF_NORMAL:
+ ref = ObjectReference(segment, object);
+ break;
+ default:
+ return ObjectReference();
+ }
+
if (checksum.size() > 0)
ref.set_checksum(checksum);
if (have_range)
- ref.set_range(range1, range2);
+ ref.set_range(range1, range2, range_exact);
return ref;
}
if (!range_valid || !ref.range_valid)
return false;
+ if (range_exact || ref.range_exact)
+ return false;
+
if (range_start + range_length == ref.range_start) {
range_length += ref.range_length;
return true;
projects / cumulus.git / blobdiff