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53 lines
1.1 KiB
C
53 lines
1.1 KiB
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_fletcher32 Fletcher32
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* @ingroup sys_checksum
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*
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* @brief Fletcher32 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 FLETCHER32_H
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#define FLETCHER32_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 32 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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* @note pay attention to alignment issues since this operates on an input
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* buffer containing 16 bit words, not bytes.
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*
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* @param buf input buffer to hash
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* @param words length of buffer, in 16 bit words
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* @return 32 bit sized hash in the interval [1..2^32]
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*/
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uint32_t fletcher32(const uint16_t *buf, size_t words);
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#ifdef __cplusplus
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}
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#endif
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#endif /* FLETCHER32_H */
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/** @} */
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