Method decode

deps/zxing/core/src/zxing/qrcode/decoder/4Decoder.cpp:64–106

}

Ref<DecoderResult> Decoder::decode(Ref<BitMatrix> bits) {
  // Construct a parser and read version, error-correction level
  BitMatrixParser parser(bits);

  // std::cerr << *bits << std::endl;

  Version *version = parser.readVersion();
  ErrorCorrectionLevel &ecLevel = parser.readFormatInformation()->getErrorCorrectionLevel();


  // Read codewords
  ArrayRef<char> codewords(parser.readCodewords());


  // Separate into data blocks
  std::vector<Ref<DataBlock> > dataBlocks(DataBlock::getDataBlocks(codewords, version, ecLevel));


  // Count total number of data bytes
  int totalBytes = 0;
  for (size_t i = 0; i < dataBlocks.size(); i++) {
    totalBytes += dataBlocks[i]->getNumDataCodewords();
  }
  ArrayRef<char> resultBytes(totalBytes);
  int resultOffset = 0;


  // Error-correct and copy data blocks together into a stream of bytes
  for (size_t j = 0; j < dataBlocks.size(); j++) {
    Ref<DataBlock> dataBlock(dataBlocks[j]);
    ArrayRef<char> codewordBytes = dataBlock->getCodewords();
    int numDataCodewords = dataBlock->getNumDataCodewords();
    correctErrors(codewordBytes, numDataCodewords);
    for (int i = 0; i < numDataCodewords; i++) {
      resultBytes[resultOffset++] = codewordBytes[i];
    }
  }

  return DecodedBitStreamParser::decode(resultBytes,
                                        version,
                                        ecLevel,
                                        DecodedBitStreamParser::Hashtable());
}