erasure_coder.h

#ifndef ISAL_INCLUDE_ERASURE_CODER_H_
#define ISAL_INCLUDE_ERASURE_CODER_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "erasure_code.h"

#define MMAX 14
#define KMAX 10

typedef struct _IsalCoder {
  int verbose;
  int numParityUnits;
  int numDataUnits;
  int numAllUnits;
} IsalCoder;

typedef struct _IsalEncoder {
  IsalCoder coder;

  unsigned char gftbls[MMAX * KMAX * 32];

  unsigned char encodeMatrix[MMAX * KMAX];
} IsalEncoder;

typedef struct _IsalDecoder {
  IsalCoder coder;

  unsigned char encodeMatrix[MMAX * KMAX];

  // Below are per decode call
  unsigned char gftbls[MMAX * KMAX * 32];
  unsigned int decodeIndex[MMAX];
  unsigned char tmpMatrix[MMAX * KMAX];
  unsigned char invertMatrix[MMAX * KMAX];
  unsigned char decodeMatrix[MMAX * KMAX];
  unsigned char erasureFlags[MMAX];
  int erasedIndexes[MMAX];
  int numErased;
  int numErasedDataUnits;
  unsigned char *realInputs[MMAX];
} IsalDecoder;

void initCoder(IsalCoder *pCoder, int numDataUnits, int numParityUnits);

void allowVerbose(IsalCoder *pCoder, int flag);

void initEncoder(IsalEncoder *encoder, int numDataUnits, int numParityUnits);

void initDecoder(IsalDecoder *decoder, int numDataUnits, int numParityUnits);

void clearDecoder(IsalDecoder *decoder);

int encode(IsalEncoder *encoder, unsigned char **dataUnits,
           unsigned char **parityUnits, int chunkSize);

int decode(IsalDecoder *decoder, unsigned char **allUnits,
           int *erasedIndexes, int numErased,
           unsigned char **recoveredUnits, int chunkSize);

int generateDecodeMatrix(IsalDecoder *pCoder);

#endif  // ISAL_INCLUDE_ERASURE_CODER_H_