iTextSharp.text.pdf.codec.TIFFFaxDecoder.SetToBlack C# (CSharp) Метод

        private void SetToBlack(byte[] buffer,
        int lineOffset, int bitOffset,
        int numBits) {
            int bitNum = 8*lineOffset + bitOffset;
            int lastBit = bitNum + numBits;
            
            int byteNum = bitNum >> 3;
            
            // Handle bits in first byte
            int shift = bitNum & 0x7;
            if (shift > 0) {
                int maskVal = 1 << (7 - shift);
                byte val = buffer[byteNum];
                while (maskVal > 0 && bitNum < lastBit) {
                    val |= (byte)maskVal;
                    maskVal >>= 1;
                    ++bitNum;
                }
                buffer[byteNum] = val;
            }
            
            // Fill in 8 bits at a time
            byteNum = bitNum >> 3;
            while (bitNum < lastBit - 7) {
                buffer[byteNum++] = (byte)255;
                bitNum += 8;
            }
            
            // Fill in remaining bits
            while (bitNum < lastBit) {
                byteNum = bitNum >> 3;
                buffer[byteNum] |= (byte)(1 << (7 - (bitNum & 0x7)));
                ++bitNum;
            }
        }