iTextSharp.text.pdf.qrcode.Encoder.GetNumDataBytesAndNumECBytesForBlockID C# (CSharp) Метод

        static void GetNumDataBytesAndNumECBytesForBlockID(int numTotalBytes, int numDataBytes,
            int numRSBlocks, int blockID, int[] numDataBytesInBlock,
            int[] numECBytesInBlock) {
            if (blockID >= numRSBlocks) {
                throw new WriterException("Block ID too large");
            }
            // numRsBlocksInGroup2 = 196 % 5 = 1
            int numRsBlocksInGroup2 = numTotalBytes % numRSBlocks;
            // numRsBlocksInGroup1 = 5 - 1 = 4
            int numRsBlocksInGroup1 = numRSBlocks - numRsBlocksInGroup2;
            // numTotalBytesInGroup1 = 196 / 5 = 39
            int numTotalBytesInGroup1 = numTotalBytes / numRSBlocks;
            // numTotalBytesInGroup2 = 39 + 1 = 40
            int numTotalBytesInGroup2 = numTotalBytesInGroup1 + 1;
            // numDataBytesInGroup1 = 66 / 5 = 13
            int numDataBytesInGroup1 = numDataBytes / numRSBlocks;
            // numDataBytesInGroup2 = 13 + 1 = 14
            int numDataBytesInGroup2 = numDataBytesInGroup1 + 1;
            // numEcBytesInGroup1 = 39 - 13 = 26
            int numEcBytesInGroup1 = numTotalBytesInGroup1 - numDataBytesInGroup1;
            // numEcBytesInGroup2 = 40 - 14 = 26
            int numEcBytesInGroup2 = numTotalBytesInGroup2 - numDataBytesInGroup2;
            // Sanity checks.
            // 26 = 26
            if (numEcBytesInGroup1 != numEcBytesInGroup2) {
                throw new WriterException("EC bytes mismatch");
            }
            // 5 = 4 + 1.
            if (numRSBlocks != numRsBlocksInGroup1 + numRsBlocksInGroup2) {
                throw new WriterException("RS blocks mismatch");
            }
            // 196 = (13 + 26) * 4 + (14 + 26) * 1
            if (numTotalBytes !=
                ((numDataBytesInGroup1 + numEcBytesInGroup1) *
                    numRsBlocksInGroup1) +
                    ((numDataBytesInGroup2 + numEcBytesInGroup2) *
                        numRsBlocksInGroup2)) {
                throw new WriterException("Total bytes mismatch");
            }

            if (blockID < numRsBlocksInGroup1) {
                numDataBytesInBlock[0] = numDataBytesInGroup1;
                numECBytesInBlock[0] = numEcBytesInGroup1;
            }
            else {
                numDataBytesInBlock[0] = numDataBytesInGroup2;
                numECBytesInBlock[0] = numEcBytesInGroup2;
            }
        }