class Decoder {

  private final ReedSolomonDecoder rsDecoder;

  public Decoder() {
    rsDecoder = new ReedSolomonDecoder(GenericGF.DATA_MATRIX_FIELD_256);
  }

  /**
   * <p>Convenience method that can decode a Data Matrix Code represented as a 2D array of booleans.
   * "true" is taken to mean a black module.</p>
   *
   * @param image booleans representing white/black Data Matrix Code modules
   * @return text and bytes encoded within the Data Matrix Code
   * @throws FormatException if the Data Matrix Code cannot be decoded
   * @throws ChecksumException if error correction fails
   */
  public DecoderResult decode(boolean[][] image) throws FormatException, ChecksumException {
    return decode(BitMatrix.parse(image));
  }

  /**
   * <p>Decodes a Data Matrix Code represented as a {@link BitMatrix}. A 1 or "true" is taken
   * to mean a black module.</p>
   *
   * @param bits booleans representing white/black Data Matrix Code modules
   * @return text and bytes encoded within the Data Matrix Code
   * @throws FormatException if the Data Matrix Code cannot be decoded
   * @throws ChecksumException if error correction fails
   */
  public DecoderResult decode(BitMatrix bits) throws FormatException, ChecksumException {<FILL_FUNCTION_BODY>}

  /**
   * <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
   * correct the errors in-place using Reed-Solomon error correction.</p>
   *
   * @param codewordBytes data and error correction codewords
   * @param numDataCodewords number of codewords that are data bytes
   * @return the number of errors corrected
   * @throws ChecksumException if error correction fails
   */
  private int correctErrors(byte[] codewordBytes, int numDataCodewords) throws ChecksumException {
    int numCodewords = codewordBytes.length;
    // First read into an array of ints
    int[] codewordsInts = new int[numCodewords];
    for (int i = 0; i < numCodewords; i++) {
      codewordsInts[i] = codewordBytes[i] & 0xFF;
    }
    int errorsCorrected = 0;
    try {
      errorsCorrected = rsDecoder.decodeWithECCount(codewordsInts, codewordBytes.length - numDataCodewords);
    } catch (ReedSolomonException ignored) {
      throw ChecksumException.getChecksumInstance();
    }
    // Copy back into array of bytes -- only need to worry about the bytes that were data
    // We don't care about errors in the error-correction codewords
    for (int i = 0; i < numDataCodewords; i++) {
      codewordBytes[i] = (byte) codewordsInts[i];
    }
    return errorsCorrected;
  }

}


    // Construct a parser and read version, error-correction level
    BitMatrixParser parser = new BitMatrixParser(bits);
    Version version = parser.getVersion();

    // Read codewords
    byte[] codewords = parser.readCodewords();
    // Separate into data blocks
    DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version);

    // Count total number of data bytes
    int totalBytes = 0;
    for (DataBlock db : dataBlocks) {
      totalBytes += db.getNumDataCodewords();
    }
    byte[] resultBytes = new byte[totalBytes];

    int errorsCorrected = 0;
    int dataBlocksCount = dataBlocks.length;
    // Error-correct and copy data blocks together into a stream of bytes
    for (int j = 0; j < dataBlocksCount; j++) {
      DataBlock dataBlock = dataBlocks[j];
      byte[] codewordBytes = dataBlock.getCodewords();
      int numDataCodewords = dataBlock.getNumDataCodewords();
      errorsCorrected += correctErrors(codewordBytes, numDataCodewords);
      for (int i = 0; i < numDataCodewords; i++) {
        // De-interlace data blocks.
        resultBytes[i * dataBlocksCount + j] = codewordBytes[i];
      }
    }

    // Decode the contents of that stream of bytes
    DecoderResult result = DecodedBitStreamParser.decode(resultBytes);
    result.setErrorsCorrected(errorsCorrected);
    return result;
  
<no_super_class>