iTextSharp.text.pdf.qrcode.FormatInformation.DoDecodeFormatInformation C# (CSharp) Method

        private static FormatInformation DoDecodeFormatInformation(int maskedFormatInfo1, int maskedFormatInfo2) {
            // Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing
            int bestDifference = int.MaxValue;
            int bestFormatInfo = 0;
            for (int i = 0; i < FORMAT_INFO_DECODE_LOOKUP.GetLength(0); i++) {
                int[] decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
                int targetInfo = decodeInfo[0];
                if (targetInfo == maskedFormatInfo1 || targetInfo == maskedFormatInfo2) {
                    // Found an exact match
                    return new FormatInformation(decodeInfo[1]);
                }
                int bitsDifference = NumBitsDiffering(maskedFormatInfo1, targetInfo);
                if (bitsDifference < bestDifference) {
                    bestFormatInfo = decodeInfo[1];
                    bestDifference = bitsDifference;
                }
                if (maskedFormatInfo1 != maskedFormatInfo2) {
                    // also try the other option
                    bitsDifference = NumBitsDiffering(maskedFormatInfo2, targetInfo);
                    if (bitsDifference < bestDifference) {
                        bestFormatInfo = decodeInfo[1];
                        bestDifference = bitsDifference;
                    }
                }
            }
            // Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits
            // differing means we found a match
            if (bestDifference <= 3) {
                return new FormatInformation(bestFormatInfo);
            }
            return null;
        }