/*
Copyright (C) Magna Carta Software, Inc. 1990.  All Rights Reserved
C COMMUNICATIONS TOOLKIT v1.0
CHECKSUM.C -- ROUTINES TO CALCULATE CHECKSUMS.
*/


#if !defined(TYPES_DEFINED)
    typedef unsigned char   BYTE;
    typedef unsigned short  WORD;
    #define TYPES_DEFINED
#endif


/* #define         checksum(a, b)  (a)+=(b) */


WORD checksum(WORD accum, WORD ch)
{
    return (accum += ch);
}



/*
CHECKSUMN -- Compute the checksum of a buffer starting at "buf" and extending
for "count" characters.
*/
WORD checksumn(char *buf, WORD count)
{
    WORD chk;

    for(chk=0; count > 0; count--) chk += *buf++;

    return (chk);
}