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

        private int DecodeBlackCodeWord() {
            int current, entry, bits, isT, code = -1;
            int runLength = 0;
            bool isWhite = false;
            
            while (!isWhite) {
                current = NextLesserThan8Bits(4);
                entry = initBlack[current];
                
                // Get the 3 fields from the entry
                isT = entry & 0x0001;
                bits = (entry >> 1) & 0x000f;
                code = (entry >> 5) & 0x07ff;
                
                if (code == 100) {
                    current = NextNBits(9);
                    entry = black[current];
                    
                    // Get the 3 fields from the entry
                    isT = entry & 0x0001;
                    bits = (entry >> 1) & 0x000f;
                    code = (entry >> 5) & 0x07ff;
                    
                    if (bits == 12) {
                        // Additional makeup codes
                        UpdatePointer(5);
                        current = NextLesserThan8Bits(4);
                        entry = additionalMakeup[current];
                        bits = (entry >> 1) & 0x07;     // 3 bits 0000 0111
                        code  = (entry >> 4) & 0x0fff;  // 12 bits
                        runLength += code;
                        
                        UpdatePointer(4 - bits);
                    } else if (bits == 15) {
                        // EOL code
                        throw new Exception("EOL code word encountered in Black run.");
                    } else {
                        runLength += code;
                        UpdatePointer(9 - bits);
                        if (isT == 0) {
                            isWhite = true;
                        }
                    }
                } else if (code == 200) {
                    // Is a Terminating code
                    current = NextLesserThan8Bits(2);
                    entry = twoBitBlack[current];
                    code = (entry >> 5) & 0x07ff;
                    runLength += code;
                    bits = (entry >> 1) & 0x0f;
                    UpdatePointer(2 - bits);
                    isWhite = true;
                } else {
                    // Is a Terminating code
                    runLength += code;
                    UpdatePointer(4 - bits);
                    isWhite = true;
                }
            }
            
            return runLength;
        }