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--- a/src/utils/circache.h
+++ b/src/utils/circache.h
@@ -1,13 +1,28 @@
+/*
+ *   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.
+ */
 #ifndef _circache_h_included_
 #define _circache_h_included_
 /* @(#$Id: $  (C) 2009 J.F.Dockes */
 /**
  * A data cache implemented as a circularly managed file
  *
- * This is used to store cached remote pages for recoll. A single file is used
- * to store the compressed pages and the associated metadata. The file
- * grows to a specified maximum size, then is rewritten from the
- * start, overwriting older entries.
+ * A single file is used to stored objects. The file grows to a
+ * specified maximum size, then is rewritten from the start,
+ * overwriting older entries.
  *
  * Data objects inside the cache each have two parts: a data segment and an 
  * attribute (metadata) dictionary.
@@ -30,20 +45,24 @@
 class CirCache {
 public:
     CirCache(const string& dir);
-    ~CirCache();
+    virtual ~CirCache();
 
-    string getReason();
+    virtual string getReason();
 
-    bool create(off_t maxsize);
+    virtual bool create(off_t maxsize);
 
     enum OpMode {CC_OPREAD, CC_OPWRITE};
-    bool open(OpMode mode);
+    virtual bool open(OpMode mode);
 
-    bool get(const string& udi, string dic, string data);
+    virtual bool get(const string& udi, string& dic, string& data, 
+                     int instance = -1);
 
-    bool put(const string& udi, const string& dic, const string& data);
+    virtual bool put(const string& udi, const string& dic, const string& data);
 
-private:
+    /* Debug */
+    virtual bool dump();
+
+protected:
     CirCacheInternal *m_d;
     string m_dir;
 };