90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
#ifndef GS_UTIL_FLETCHER_H
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#define GS_UTIL_FLETCHER_H
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/* Copyright (c) 2013-2017 GomSpace A/S. All rights reserved. */
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/**
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@file
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Fletcher16 checksum,
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*/
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#include <gs/util/types.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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Fletcher16 checksum (read using copy function).
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Data is read from \a data, using the specified \a memcpyfcn function.
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@param[in] data data.
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@param[in] size number of \a data bytes.
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@param[in] memcpyfcn memory copy function. If NULL is specified, standard memcpy will be used.
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@returns fletcher16 checksum
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*/
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uint16_t gs_fletcher16_memcpy(const void * data, size_t size, void * (*memcpyfcn)(void *, const void *, size_t));
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/**
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Fletcher16 checksum (read from program memory).
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AVR8: reads from program memory.
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Other architectures: identical to gs_fletcher16().
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@param[in] data_in data.
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@param[in] size number of \a data bytes.
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@returns fletcher16 checksum
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*/
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uint16_t gs_fletcher16_P(const void * data_in, size_t size);
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/**
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Fletcher16 checksum.
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@param[in] data data.
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@param[in] size number of \a data bytes.
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@returns fletcher16 checksum
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*/
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uint16_t gs_fletcher16(const void * data, size_t size);
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/**
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Fletcher16 working set.
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@see gs_fletcher16_init(), gs_fletcher16_update(), gs_fletcher16_finalize()
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*/
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typedef struct {
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/**
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Sum1 - internal.
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*/
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uint16_t sum1;
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/**
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Sum2 - internal.
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*/
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uint16_t sum2;
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} gs_fletcher16_t;
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/**
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Initialize fletcher16 working set.
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@param[in] f16 working set.
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*/
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void gs_fletcher16_init(gs_fletcher16_t * f16);
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/**
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Update fletcher16 checksum.
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@param[in] f16 working set.
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@param[in] data data.
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@param[in] size number of \a data bytes.
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*/
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void gs_fletcher16_update(gs_fletcher16_t * f16, const void * data, size_t size);
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/**
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Finalize fletcher16 checksum and return it.
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@param[in] f16 working set.
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@returns fletcher16 checksum
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*/
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uint16_t gs_fletcher16_finalize(gs_fletcher16_t * f16);
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#ifdef __cplusplus
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}
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#endif
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#endif
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