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/*
* Copyright (C) 2015 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_checksum_fletcher32 Fletcher32
* @ingroup sys_checksum
*
* @brief Fletcher32 checksum algorithm
* @{
*
* @file
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
*/
#ifndef CHECKSUM_FLETCHER32_H
#define CHECKSUM_FLETCHER32_H
#include <stdlib.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Fletcher's 32 bit checksum
*
* found on
* http://en.wikipedia.org/w/index.php?title=Fletcher%27s_checksum&oldid=661273016#Optimizations
*
* @note the returned sum is never 0
* @note pay attention to alignment issues since this operates on an input
* buffer containing 16 bit words, not bytes.
*
* @param buf input buffer to hash
* @param words length of buffer, in 16 bit words
* @return 32 bit sized hash in the interval [1..2^32]
*/
uint32_t fletcher32(const uint16_t *buf, size_t words);
#ifdef __cplusplus
}
#endif
#endif /* CHECKSUM_FLETCHER32_H */
/** @} */