iTextSharp.text.pdf.BarcodeDatamatrix.B256Encodation C# (CSharp) Метод

        private static int B256Encodation(byte[] text, int textOffset, int textLength, byte[] data, int dataOffset, int dataLength) {
            int k, j, prn, tv, c;
            if (textLength == 0)
                return 0;
            if (textLength < 250 && textLength + 2 > dataLength)
                return -1;
            if (textLength >= 250 && textLength + 3 > dataLength)
                return -1;
            data[dataOffset] = (byte)231;
            if (textLength < 250) {
                data[dataOffset + 1] = (byte)textLength;
                k = 2;
            }
            else {
                data[dataOffset + 1] = (byte)(textLength / 250 + 249);
                data[dataOffset + 2] = (byte)(textLength % 250);
                k = 3;
            }
            System.Array.Copy(text, textOffset, data, k + dataOffset, textLength);
            k += textLength + dataOffset;
            for (j = dataOffset + 1; j < k; ++j) {
                c = data[j] & 0xff;
                prn = ((149 * (j + 1)) % 255) + 1;
                tv = c + prn;
                if (tv > 255)
                    tv -= 256;
                data[j] = (byte)tv;

            }
            return k - dataOffset;
        }