text: //
  // Copyright 2018, Jeremy Cooper
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions
  // are met:
  //
  // 1. Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //
  // 2. Redistributions in binary form must reproduce the above copyright
  // notice, this list of conditions and the following disclaimer in the
  // documentation and/or other materials provided with the distribution.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  // COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  //
  
  #ifndef RDAT_ECC_C2_H
  #define RDAT_ECC_C2_H
  
  #include <stdint.h>
  #include <stddef.h>
  #include "ECCFill.h"
  
  class ECC_C2 {
  public:
    ECC_C2();
    ~ECC_C2();
    
    typedef enum {
      NO_ERRORS = 0,
      CORRECTED,
      UNCORRECTABLE
    } Status;
  
    //
    // The block size and number of parity bytes for this code,
    // respectively.
    //
    static const unsigned int kN = 32;
    static const unsigned int kTwoT = 6;
    static const unsigned int kT = kTwoT / 2;
  
    //
    // Fill this vector from the given source.
    //
    void Fill(ECCFill& fill);
  
    //
    // Correct this vector, if possible. Returns the correction
    // status.
    //
    Status Correct();
  
    //
    // Dump this corrected (or invalidated) vector back to its
    // source.
    //
    void Dump(ECCFill& fill);
  
  protected:
    bool ComputeSyndrome(uint8_t syndrome[kTwoT]);
    bool HandleSyndrome(uint8_t syndrome[kTwoT],
       const uint8_t erasures[kTwoT], size_t numErasures);
    
    //
    // The data in the vector.
    //
    uint8_t mData[kN];
    
    //
    // Known erasures in this vector.
    //
    bool    mDataIsValid[kN];
  };
  
  #endif
  