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/*********************************************************************

 *

 * Filename:      crc.h

 * Version:

 * Description:   CRC routines

 * Status:        Experimental.

 * Author:        Dag Brattli <dagb@cs.uit.no>

 * Created at:    Mon Aug  4 20:40:53 1997

 * Modified at:   Sun May  2 20:25:23 1999

 * Modified by:   Dag Brattli <dagb@cs.uit.no>

 *

 ********************************************************************/

#ifndef IRDA_CRC_H

#define IRDA_CRC_H

#include <linux/types.h>

#define INIT_FCS  0xffff   /* Initial FCS value */

#define GOOD_FCS  0xf0b8   /* Good final FCS value */

extern __u16 const irda_crc16_table[];

/* Recompute the FCS with one more character appended. */

static inline __u16 irda_fcs(__u16 fcs, __u8 c)

{

        return (((fcs) >> 8) ^ irda_crc16_table[((fcs) ^ (c)) & 0xff]);

}

/* Recompute the FCS with len bytes appended. */

unsigned short irda_calc_crc16( __u16 fcs, __u8 const *buf, size_t len);

#endif