ErrorCorrection.h Example File

 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-

 #ifndef __ERROR_CORRECTION_PDF_H__
 #define __ERROR_CORRECTION_PDF_H__
 /*
  * Copyright 2012 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  * 2012-09-17 HFN translation from Java into C++
  */

 #include <zxing/common/Counted.h>
 #include <zxing/common/Array.h>
 #include <zxing/common/DecoderResult.h>
 #include <zxing/common/BitMatrix.h>
 #include <zxing/pdf417/decoder/ec/ModulusGF.h>
 #include <zxing/pdf417/decoder/ec/ModulusPoly.h>
 #include <zxing/common/reedsolomon/ReedSolomonException.h>

 namespace zxing {
 namespace pdf417 {
 namespace decoder {
 namespace ec {

 /**
  * <p>PDF417 error correction implementation.</p>
  *
  * <p>This <a href="http://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction#Example">example</a>
  * is quite useful in understanding the algorithm.</p>
  *
  * @author Sean Owen
  * @see com.google.zxing.common.reedsolomon.ReedSolomonDecoder
  */
 class ErrorCorrection: public Counted {

  private:
   ModulusGF &field_;

  public:
   ErrorCorrection();
   void decode(ArrayRef<int> received,
               int numECCodewords,
               ArrayRef<int> erasures);

  private:
   std::vector<Ref<ModulusPoly> > runEuclideanAlgorithm(Ref<ModulusPoly> a, Ref<ModulusPoly> b, int R);

   ArrayRef<int> findErrorLocations(Ref<ModulusPoly> errorLocator);
   ArrayRef<int> findErrorMagnitudes(Ref<ModulusPoly> errorEvaluator,
                                     Ref<ModulusPoly> errorLocator,
                                     ArrayRef<int> errorLocations);
 };

 }
 }
 }
 }

 #endif /* __ERROR_CORRECTION_PDF_H__ */