libcros 0.5.2

A Rust library that provides easy-to-use functions for interacting with a Chrome device
Documentation 
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/*
 * Copyright 2010 Google LLC
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
#include <inttypes.h>
#include <sys/types.h>

#include "lib/checksum.h"

/*
  * zero8_csum - Calculates 8-bit zero-sum checksum
  *
  * @buf:  input buffer
  * @len:  length of buffer
  *
  * The summation of the bytes in the array and the csum will equal zero
  * for 8-bit data size.
  *
  * returns checksum to indicate success
  */
uint8_t zero8_csum(uint8_t *buf, size_t len)
{
  uint8_t *u = buf;
  uint8_t csum = 0;

  while (u < buf + len) {
    csum += *u;
    u++;
  }

  return (0x100 - csum);
}