/* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
   *
   * Simon Wunderlich, Marek Lindner
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License 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, see <http://www.gnu.org/licenses/>.
   */
  
  #ifndef _NET_BATMAN_ADV_BITARRAY_H_
  #define _NET_BATMAN_ADV_BITARRAY_H_
  
  /* Returns 1 if the corresponding bit in the given seq_bits indicates true
   * and curr_seqno is within range of last_seqno. Otherwise returns 0.
   */
  static inline int batadv_test_bit(const unsigned long *seq_bits,
  				  uint32_t last_seqno, uint32_t curr_seqno)
  {
  	int32_t diff;
  
  	diff = last_seqno - curr_seqno;
  	if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
  		return 0;
  	else
  		return test_bit(diff, seq_bits) != 0;
  }
  
  /* turn corresponding bit on, so we can remember that we got the packet */
  static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
  {
  	/* if too old, just drop it */
  	if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
  		return;
  
  	set_bit(n, seq_bits); /* turn the position on */
  }
  
  /* receive and process one packet, returns 1 if received seq_num is considered
   * new, 0 if old
   */
  int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
  			  int32_t seq_num_diff, int set_mark);
  
  #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */