add ObjectDB interface
diff --git a/include/object-db.h b/include/object-db.h
new file mode 100644
index 0000000..d99eeb6
--- /dev/null
+++ b/include/object-db.h
@@ -0,0 +1,56 @@
+#ifndef OBJECT_DB_H
+#define OBJECT_DB_H
+
+#include <boost/exception/all.hpp>
+#include <vector>
+
+using namespace std;
+
+struct ObjectDBException : virtual boost::exception, virtual exception { };
+
+typedef unsigned char Byte;
+typedef vector<Byte> Bytes;
+
+// OK. This name is a bit miss-leading, but this ObjectDB is really some storage
+// that stores the Ccnx ContentObjects of a file. So unlike a normal database,
+// this DB is per file.
+
+// The assumption is, the ContentObjects will be write to ObjectDB sequentially
+// This guarantees that when read, the Nth ContentObject read has the sequence number N as the last component of its name
+class ObjectDB
+{
+public:
+ virtual ~ObjectDB(){}
+
+ // assume sequential
+ virtual void
+ append(const Bytes &co) = 0;
+
+ // get next CO
+ virtual Bytes
+ next() = 0;
+
+ // get n COs; if the remaining number of COs < n, return all;
+ virtual void
+ read(const vector<Bytes> &vco, int n) = 0;
+
+ // size in terms of number of COs
+ virtual int
+ size() = 0 const;
+
+ // the current index of in terms of COs
+ virtual int
+ pos() = 0 const;
+
+ // set the pos to be desired pos in terms of COs
+ // return true if success
+ virtual bool
+ seek(int pos) = 0;
+
+ // reset pos to be zero
+ virtual void
+ rewind() = 0;
+
+};
+
+#endif