Add a new object-oriented wrapper for building object references.

[cumulus.git] / ref.cc

diff --git a/ref.cc b/ref.cc
new file mode 100644 (file)
index 0000000..e996c7d
--- /dev/null
+++ b/ref.cc
@@ -0,0 +1,57 @@
+/* LBS: An LFS-inspired filesystem backup system
+ * Copyright (C) 2007  Michael Vrable
+ *
+ * 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 <uuid/uuid.h>
+
+#include <string>
+
+#include "ref.h"
+
+using std::string;
+
+/* Generate a new UUID, and return the text representation of it.  This is
+ * suitable for generating the name for a new segment. */
+string generate_uuid()
+{
+    uint8_t uuid[16];
+    char buf[40];
+
+    uuid_generate(uuid);
+    uuid_unparse_lower(uuid, buf);
+    return string(buf);
+}
+
+
+ObjectReference::ObjectReference(const std::string& segment, int sequence)
+    : segment(segment)
+{
+    char seq_buf[64];
+    sprintf(seq_buf, "%08x", sequence);
+    object = seq_buf;
+
+    clear_checksum();
+    clear_range();
+}
+
+string ObjectReference::to_string() const
+{
+    string result = segment + "/" + object;
+
+    if (checksum_valid)
+        result += "(" + checksum + ")";
+
+    if (range_valid) {
+        char buf[64];
+        sprintf(buf, "[%zu+%zu]", range_start, range_length);
+        result += buf;
+    }
+
+    return result;
+}