/*
 *  anytun
 *
 *  The secure anycast tunneling protocol (satp) defines a protocol used
 *  for communication between any combination of unicast and anycast
 *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
 *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
 *  ethernet, ip, arp ...). satp directly includes cryptography and
 *  message authentication based on the methodes used by SRTP.  It is
 *  intended to deliver a generic, scaleable and secure solution for
 *  tunneling and relaying of packets of any protocol.
 *
 *
 *  Copyright (C) 2007-2009 Othmar Gsenger, Erwin Nindl, 
 *                          Christian Pointner <satp@wirdorange.org>
 *
 *  This file is part of Anytun.
 *
 *  Anytun 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 3 of the License, or
 *  any later version.
 *
 *  Anytun 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 anytun.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ANYTUN_buffer_h_INCLUDED
#define ANYTUN_buffer_h_INCLUDED

#include "datatypes.h"
#include <string>

class TunDevice;
class UDPPacketSource;

class Buffer
{
public:
  Buffer(bool allow_realloc = true);
  Buffer(u_int32_t length, bool allow_realloc = true);
  Buffer(u_int8_t* data, u_int32_t length, bool allow_realloc = true);
  Buffer(std::string hex_data, bool allow_realloc = true);
  virtual ~Buffer();
  Buffer(const Buffer &src);
  void operator=(const Buffer &src);
  bool operator==(const Buffer &cmp) const;
  Buffer operator^(const Buffer &xor_by) const;

  u_int32_t getLength() const;
  virtual void setLength(u_int32_t new_length);
  u_int8_t* getBuf();
  u_int8_t& operator[](u_int32_t index);
  u_int8_t operator[](u_int32_t index) const;
  std::string getHexDump() const;
  std::string getHexDumpOneLine() const;

  bool isReallocAllowed() const;

  operator u_int8_t*();

protected:
  virtual void reinit() {};

  u_int8_t *buf_;
  u_int32_t length_;
  u_int32_t real_length_;
  bool allow_realloc_;

  static const u_int32_t OVER_SIZE_ = 100;
};

#endif