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/******************************************************************************
** libDXFrw - Library to read/write DXF files (ascii & binary) **
** **
** Copyright (C) 2011-2014 J.F. Soriano (Rallaz), rallazz@gmail.com **
** **
** This library is free software, licensed under the terms of the GNU **
** General Public License as published by the Free Software Foundation, **
** either version 2 of the License, or (at your option) any later version. **
** You should have received a copy of the GNU General Public License **
** along with this program. If not, see <http://www.gnu.org/licenses/>. **
******************************************************************************/
/**
* Reed-Solomon codec
* Reed Solomon code lifted from encoder/decoder for Reed-Solomon written by Simon Rockliff
*
* Original code:
* This program may be freely modified and/or given to whoever wants it.
* A condition of such distribution is that the author's contribution be
* acknowledged by his name being left in the comments heading the program,
* however no responsibility is accepted for any financial or other loss which
* may result from some unforseen errors or malfunctioning of the program
* during use.
* Simon Rockliff, 26th June 1991
*/
#ifndef RSCODEC_H
#define RSCODEC_H
/**
mm: RS code over GF(2^4)
nn: nn= (2^mm) - 1 length of codeword
tt: number of errors that can be corrected
kk: kk = nn-2*tt
pp: irreducible polynomial coeffts, pp [mm] send as int
*/
class RScodec {
public:
RScodec(unsigned int pp, int mm, int tt);
~RScodec();
// bool encode(int *data, int *parity);
// int decode(int *recd);
bool encode(unsigned char *data, unsigned char *parity);
int decode(unsigned char *data);
bool isOkey(){return isOk;}
const unsigned int* indexOf() {return index_of;}
const int* alphaTo() {return alpha_to;}
private:
void RSgenerate_gf(unsigned int pp);
void RSgen_poly();
int calcDecode(unsigned char* data, int* recd, int** elp, int* d, int* l, int* u_lu, int* s, int* root, int* loc, int* z, int* err, int* reg, int bb);
private:
int mm; //RS code over GF(2^4)
int tt; //number of errors that can be corrected
int nn; //(2^mm) - 1 length of codeword
int kk; //nn-2*tt length of original data
int *gg;
bool isOk;
unsigned int *index_of;
int *alpha_to;
};
#endif // RSCODEC_H
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