/*
 *	$Source: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/update/checksum.c,v $
 *	$Header: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/update/checksum.c,v 1.4 1996/06/02 07:44:28 ghudson Exp $
 */
/*  (c) Copyright 1988 by the Massachusetts Institute of Technology. */
/*  For copying and distribution information, please see the file */
/*  <mit-copyright.h>. */

#ifndef lint
static char *rcsid_checksum_c = "$Header: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/update/checksum.c,v 1.4 1996/06/02 07:44:28 ghudson Exp $";
#endif	lint

#include <mit-copyright.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/file.h>

/*
 * checksum_fd(fd)
 * returns 24-bit checksum of bytes in file
 */

int
checksum_file(path)
char *path;
{
    register int sum;
    register int ch;
    register FILE *f;

    sum = 0;
    f = fopen(path, "r");
    while ((ch = getc(f)) != EOF) {
	sum = (sum + ch) & ((1<<24)-1);
    }
    fclose(f);
    return(sum);
}