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/* SPDX-License-Identifier: GPL-2.0-or-later */
/***************************************************************************
* Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg *
* marian.buschsieweke@ovgu.de *
***************************************************************************/
#ifndef OPENOCD_HELPER_CRC32_H
#define OPENOCD_HELPER_CRC32_H
#include <stdint.h>
#include <stddef.h>
/** @file
* A generic CRC32 implementation
*/
/**
* CRC32 polynomial commonly used for little endian CRC32
*/
#define CRC32_POLY_LE 0xedb88320
/**
* Calculate the CRC32 value of the given data
* @param poly The polynomial of the CRC
* @param seed The seed to use (mostly either `0` or `0xffffffff`)
* @param data The data to calculate the CRC32 of
* @param data_len The length of the data in @p data in bytes
* @return The CRC value of the first @p data_len bytes at @p data
* @note This function can be used to incrementally compute the CRC one
* chunk of data at a time by using the CRC32 of the previous chunk
* as @p seed for the next chunk.
*/
uint32_t crc32_le(uint32_t poly, uint32_t seed, const void *data,
size_t data_len);
#endif /* OPENOCD_HELPER_CRC32_H */
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