Function CorrectErrors

czxing/src/main/cpp/zxing/src/qrcode/QRDecoder.cpp:39–52

* Given data and error-correction codewords received, possibly corrupted by errors, attempts to * correct the errors in-place using Reed-Solomon error correction. * * @param codewordBytes data and error correction codewords * @param numDataCodewords number of codewords that are data bytes * @return false if error correction fails */

* @return false if error correction fails
*/
static bool CorrectErrors(ByteArray& codewordBytes, int numDataCodewords)
{
	// First read into an array of ints
	std::vector<int> codewordsInts(codewordBytes.begin(), codewordBytes.end());

	int numECCodewords = Size(codewordBytes) - numDataCodewords;
	if (!ReedSolomonDecode(GenericGF::QRCodeField256(), codewordsInts, numECCodewords))
		return false;

	// 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
	std::copy_n(codewordsInts.begin(), numDataCodewords, codewordBytes.begin());
	return true;
}


/**