forked from auracaster/openocd
6e67f1473a
This generalizes the little endian CRC32 function used in the OR1K target and moves it to a common helper, so that other places do not need to reinvent the wheel. It is directly used in the OR1K target. Change-Id: I0e55340281a5bfd80669bb1994f3a96fecc1248a Signed-off-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de> Reviewed-on: https://review.openocd.org/c/openocd/+/7415 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/***************************************************************************
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* Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg *
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* marian.buschsieweke@ovgu.de *
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***************************************************************************/
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#ifndef OPENOCD_HELPER_CRC32_H
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#define OPENOCD_HELPER_CRC32_H
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#include <stdint.h>
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#include <stddef.h>
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/** @file
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* A generic CRC32 implementation
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*/
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/**
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* CRC32 polynomial commonly used for little endian CRC32
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*/
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#define CRC32_POLY_LE 0xedb88320
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/**
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* Calculate the CRC32 value of the given data
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* @param poly The polynomial of the CRC
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* @param seed The seed to use (mostly either `0` or `0xffffffff`)
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* @param data The data to calculate the CRC32 of
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* @param data_len The length of the data in @p data in bytes
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* @return The CRC value of the first @p data_len bytes at @p data
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* @note This function can be used to incrementally compute the CRC one
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* chunk of data at a time by using the CRC32 of the previous chunk
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* as @p seed for the next chunk.
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*/
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uint32_t crc32_le(uint32_t poly, uint32_t seed, const void *data,
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size_t data_len);
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#endif /* OPENOCD_HELPER_CRC32_H */
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