--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/common/chunk.h	Tue Aug 29 17:42:13 2006 +0200
@@ -0,0 +1,89 @@
+/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
+/*
+ * Copyright (c) 2005 INRIA
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * 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
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#ifndef CHUNK_H
+#define CHUNK_H
+
+#include <stdint.h>
+#include <ostream>
+#include "buffer.h"
+
+namespace yans {
+
+/**
+ * \brief Protocol header serialization and deserialization.
+ *
+ * Every Protocol header which needs to be inserted and removed
+ * from a Packet instance must derive from this abstract base class
+ * and implement the private pure virtual methods defined here.
+ */
+class Chunk {
+public:
+	Chunk ();
+	/**
+	 * Derived classes must provided an explicit virtual destructor
+	 */
+	virtual ~Chunk () = 0;
+
+	void print (std::ostream &os) const;
+
+	void add (Buffer *buffer) const;
+	void peek (Buffer const *buffer);
+	void remove (Buffer *buffer);
+private:
+	bool m_must_peek_before_remove;
+	/**
+	 * \param os the std output stream in which this 
+	 *           protocol header must print itself.
+	 */
+	virtual void print (std::ostream *os) const = 0;
+
+	/**
+	 * \param buffer the buffer in which the protocol header
+	 *        must serialize itself.
+	 *
+	 * This method must:
+	 *   - reserve room for its serialized representation in the input buffer
+	 *   - serialize itself in this reserved room
+	 */
+	virtual void add_to (Buffer *buffer) const = 0;
+	/**
+	 * \param buffer the buffer from which the protocol header must
+	 *        deserialize itself.
+	 *
+	 */
+	virtual void peek_from (Buffer const *buffer) = 0;
+	/**
+	 * \param buffer the buffer from which the protocol header
+	 *        must remove itself.
+	 *
+	 * This method must remove its serialized representation 
+	 * from the input buffer. This method does not need to deserialize
+	 * the data itself.
+	 */
+	virtual void remove_from (Buffer *buffer) = 0;
+};
+
+std::ostream& operator<< (std::ostream& os, Chunk const& chunk);
+
+}; // namespace yans
+
+#endif /* CHUNK_H */