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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 crc_calc( __u16 fcs, __u8 const *buf, size_t len);
#endif
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