[moira.git] / update / checksum.c

/*
 *	$Source$
 *	$Header$
 */
/*  (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 = "$Header$";
#endif

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

  sum = 0;
  f = fopen(path, "r");
  while ((ch = getc(f)) != EOF)
    sum = (sum + ch) & ((1 << 24) - 1);
  fclose(f);
  return sum;
}
Commit	Line	Data
de56407f	1	/*
	2	* $Source$
	3	* $Header$
	4	*/
546bc43b	5	/* (c) Copyright 1988 by the Massachusetts Institute of Technology. */
	6	/* For copying and distribution information, please see the file */
	7	/* <mit-copyright.h>. */
de56407f	8
	9	#ifndef lint
	10	static char *rcsid_checksum_c = "$Header$";
7da203a3	11	#endif
de56407f	12
546bc43b	13	#include <mit-copyright.h>
de56407f	14	#include <stdio.h>
3014c74a	15	#include <sys/types.h>
de56407f	16	#include <sys/file.h>
	17
	18	/*
	19	* checksum_fd(fd)
	20	* returns 24-bit checksum of bytes in file
	21	*/
	22
5eaef520	23	int checksum_file(char *path)
de56407f	24	{
44d12d58	25	int sum;
	26	int ch;
	27	FILE *f;
de56407f	28
5eaef520	29	sum = 0;
	30	f = fopen(path, "r");
	31	while ((ch = getc(f)) != EOF)
	32	sum = (sum + ch) & ((1 << 24) - 1);
	33	fclose(f);
	34	return sum;
de56407f	35	}