/* SPDX-License-Identifier: GPL-2.0-only */ /* * Generic binary BCH encoding/decoding library * * Copyright © 2011 Parrot S.A. * * Author: Ivan Djelic <ivan.djelic@parrot.com> * * Description: * * This library provides runtime configurable encoding/decoding of binary * Bose-Chaudhuri-Hocquenghem (BCH) codes. #ifndef _BCH_H#define _BCH_H#include <linux/types.h>/** * struct bch_control - BCH control structure * @m: Galois field order * @n: maximum codeword size in bits (= 2^m-1) * @t: error correction capability in bits * @ecc_bits: ecc exact size in bits, i.e. generator polynomial degree (<=m*t) * @ecc_bytes: ecc max size (m*t bits) in bytes * @a_pow_tab: Galois field GF(2^m) exponentiation lookup table * @a_log_tab: Galois field GF(2^m) log lookup table * @mod8_tab: remainder generator polynomial lookup tables * @ecc_buf: ecc parity words buffer * @ecc_buf2: ecc parity words buffer * @xi_tab: GF(2^m) base for solving degree 2 polynomial roots * @syn: syndrome buffer * @cache: log-based polynomial representation buffer * @elp: error locator polynomial * @poly_2t: temporary polynomials of degree 2t * @swap_bits: swap bits within data and syndrome bytes struct bch_control {unsigned int m;unsigned int n;unsigned int t;unsigned int ecc_bits;unsigned int ecc_bytes;/* private: */ unsigned int *xi_tab;unsigned int *syn;int *cache;struct gf_poly *elp;struct gf_poly *poly_2t[4];bool swap_bits;struct bch_control *bch_init(int m, int t, unsigned int prim_poly,bool swap_bits);void bch_free(struct bch_control *bch);void bch_encode(struct bch_control *bch, const uint8_t *data,unsigned int len, uint8_t *ecc);int bch_decode(struct bch_control *bch, const uint8_t *data, unsigned int len,const uint8_t *recv_ecc, const uint8_t *calc_ecc,const unsigned int *syn, unsigned int *errloc);#endif /* _BCH_H */ quality 100%
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