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diff --git a/Docs/developers/other/sniffs/irda/tools/fcs/fcs.h b/Docs/developers/other/sniffs/irda/tools/fcs/fcs.h
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+/*********************************************************************
+ *                
+ * Filename:      fcs.h
+ * Version:       
+ * Description:   fcs routines for irda
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Mon Aug  4 20:40:53 1997
+ * Modified at:   Sat Jul 17 08:43:59 1999
+ * Modified by:   Thomas Schneider <nok-trace-men@dev-thomynet.de>
+ * Sources:       crc.h by Dag Brattli <dagb@cs.uit.no> in
+ *                linux-irda-project
+ * 
+ ********************************************************************/
+
+#ifndef FCS_H
+#define FCS_H
+
+#include <linux/types.h>
+
+#define INIT_FCS  0xffff   /* Initial FCS value    */
+#define GOOD_FCS  0xf0b8   /* Good final FCS value */
+
+#define IR_FCS(fcs, byte)((fcs >> 8)^irda_fcs16_table[ (fcs^byte) & 0xff])
+
+unsigned short fcs_calc( __u16 oldfcs, __u8 *buf, int len);
+
+extern __u16 irda_fcs16_table[];
+
+#endif