--- a
+++ b/upmpd/ohmetacache.cxx
@@ -0,0 +1,95 @@
+/* Copyright (C) 2014 J.F.Dockes
+ *	 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.,
+ *	 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <iostream>
+using namespace std;
+
+#include "ohmetacache.hxx"
+#include "conftree.hxx"
+#include "libupnpp/log.hxx"
+#include "base64.hxx"
+
+// We use base64 to encode names and value, and need to replace the '='
+static const char eqesc = '*';
+static void eqtoggle(string& nm)
+{
+    int i = nm.size() - 1;
+    while (i >= 0) {
+        if (nm[i] == '=') {
+            nm[i] = eqesc;
+        } else if (nm[i] == eqesc) {
+            nm[i] = '=';
+        } else {
+            break;
+        }
+        i--;
+    }
+}
+
+bool dmcacheSave(const char *fn, const mcache_type& cache)
+{
+    ConfSimple cs(fn);
+    if (cs.getStatus() != ConfSimple::STATUS_RW) {
+        LOGERR("dmcacheSave: could not open " << fn << " for writing" << endl);
+        return false;
+    }
+    cs.clear();
+    cs.holdWrites(true);
+    for (mcache_type::const_iterator it = cache.begin();
+         it != cache.end(); it++) {
+        //LOGDEB("dmcacheSave: " << it->first << " -> " << it->second << endl);
+        string name = base64_encode(it->first);
+        eqtoggle(name);
+        cs.set(name, base64_encode(it->second));
+    }
+    
+    if (!cs.holdWrites(false)) {
+        LOGERR("dmcacheSave: write error while saving to " << fn << endl);
+        return false;
+    }
+    return true;
+}
+
+bool dmcacheRestore(const char *fn, mcache_type& cache)
+{
+    ConfSimple cs(fn, 1);
+    if (!cs.ok()) {
+        LOGINF("dmcacheRestore: could not read metadata from " << fn << endl);
+        return false;
+    }
+
+    vector<string> names = cs.getNames("");
+    for (auto &name : names) {
+        string value;
+        if (!cs.get(name, value)) {
+            // ??
+            LOGDEB("dmcacheRestore: no data for found name " << name << endl);
+            continue;
+        }
+        eqtoggle(name);
+        name = base64_decode(name); 
+        value = base64_decode(value);
+        LOGDEB("dmcacheRestore: " << name << " -> " << 
+               value.substr(0, 20) << endl);
+        cache[name] = value;
+    }
+    return true;
+}
+