Added SNAP. Couldn't test it yet.

include/snap.h

@@ -0,0 +1,76 @@
+/*
+ * libtins is a net packet wrapper library for crafting and
+ * interpreting sniffed packets.
+ *
+ * Copyright (C) 2011 Nasel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __IEEE8022_H
+#define __IEEE8022_H
+
+
+#include <stdint.h>
+#include "pdu.h"
+
+namespace Tins {
+
+    /**
+     * \brief Class representing a SNAP frame.
+     * 
+     * So far only unnumbered information structure is supported.
+     */
+    class SNAP : public PDU {
+    public:
+        /**
+         * \brief Creates an instance of SNAP
+         * \param child The child PDU.(optional)
+         */
+        SNAP(PDU *child = 0);
+        
+        /**
+         * \brief Returns the SNAP frame's header length.
+         *
+         * \return The header's size.
+         * \sa PDU::header_size()
+         */
+        uint32_t header_size() const;
+        
+        /**
+         * \brief Getter for the PDU's type.
+         * \sa PDU::pdu_type
+         */
+        PDUType pdu_type() const { return PDU::SNAP; }
+    private:
+        struct snaphdr {
+            uint8_t dsap;
+            uint8_t ssap;
+            uint32_t id:2,
+                reserved1:2,
+                poll:2,
+                reserved2:2,
+                org_code:24;
+            uint16_t eth_type;
+        } __attribute__((__packed__));
+        
+        void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
+        
+        snaphdr _snap;
+    };
+    
+};
+
+#endif