#ifndef XPKMASTER_CHECKSUM_C
#define XPKMASTER_CHECKSUM_C

/* Routinesheader

	Name:		checksum.c
	Main:		xpkmaster
	Versionstring:	$VER: checksum.c 1.3 (09.01.1998)
	Author:		SDI
	Distribution:	Freeware
	Description:	Simple checksum routines

 1.0   05.10.96 : first real version
 1.1   30.01.97 : added new option to cchecksum, became necessary
 1.2   31.01.97 : removed new option
 1.3   09.01.98 : added XPK_ALLINONE
*/

#include <exec/types.h>
#include "xpkmaster.h"

XPK_ALLINONE UBYTE hchecksum(STRPTR ptr, ULONG count)
{
  register UBYTE sum = 0;

  while(count-- > 0)
    sum ^= *ptr++;

  return sum;
}

XPK_ALLINONE UWORD cchecksum(ULONG *ptr, ULONG count)
{
  register ULONG sum = 0;

  while(count-- > 0)
    sum ^= *ptr++;

  return (UWORD) (sum ^ (sum >> 16));
}

#endif /* XPKMASTER_CHECKSUM_C */