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52 lines
1012 B
C
52 lines
1012 B
C
/*
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* Copyright (C) 2015 Eistec AB
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup sys_checksum_fletcher16 Fletcher16
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* @ingroup sys_checksum
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*
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* @brief Fletcher16 checksum algorithm
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* @{
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*
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* @file
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* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
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*/
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#ifndef FLETCHER16_H
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#define FLETCHER16_H
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#include <stdlib.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Fletcher's 16 bit checksum
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*
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* found on
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* http://en.wikipedia.org/w/index.php?title=Fletcher%27s_checksum&oldid=661273016#Optimizations
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*
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* @note the returned sum is never 0
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*
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* @param buf input buffer to hash
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* @param bytes length of buffer, in bytes
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* @return 16 bit sized hash in the interval [1..65535]
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*/
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uint16_t fletcher16(const uint8_t *buf, size_t bytes);
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#ifdef __cplusplus
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}
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#endif
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#endif /* FLETCHER16_H */
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/** @} */
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