src/main/java/org/apache/xmlgraphics/image/codec/tiff/TIFFFaxDecoder.java [801:839]:
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                bitOffset = startX;

                lastChangingElement = 0;

                while (bitOffset < w) {
                    // Get the next changing element
                    getNextChangingElement(a0, isWhite, b);

                    b1 = b[0];
                    b2 = b[1];

                    // Get the next seven bits
                    entry = nextLesserThan8Bits(7);

                    // Run these through the 2DCodes table
                    entry = twoDCodes[entry] & 0xff;

                    // Get the code and the number of bits used up
                    code = (entry & 0x78) >>> 3;
                    bits = entry & 0x07;

                    if (code == 0) {
                        if (!isWhite) {
                            setToBlack(buffer, lineOffset, bitOffset,
                                       b2 - bitOffset);
                        }
                        bitOffset = a0 = b2;

                        // Set pointer to consume the correct number of bits.
                        updatePointer(7 - bits);
                    } else if (code == 1) {
                        // Horizontal
                        updatePointer(7 - bits);

                        // identify the next 2 codes.
                        int number;
                        if (isWhite) {
                            number = decodeWhiteCodeWord();
                            bitOffset += number;
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src/main/java/org/apache/xmlgraphics/image/codec/tiff/TIFFFaxDecoder.java [951:991]:
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            bitOffset = startX;

            // Reset search start position for getNextChangingElement
            lastChangingElement = 0;

            // Till one whole scanline is decoded
            while (bitOffset < w) {
                // Get the next changing element
                getNextChangingElement(a0, isWhite, b);
                b1 = b[0];
                b2 = b[1];

                // Get the next seven bits
                entry = nextLesserThan8Bits(7);
                // Run these through the 2DCodes table
                entry = twoDCodes[entry] & 0xff;

                // Get the code and the number of bits used up
                code = (entry & 0x78) >>> 3;
                bits = entry & 0x07;

                if (code == 0) { // Pass
                    // We always assume WhiteIsZero format for fax.
                    if (!isWhite) {
                        setToBlack(buffer, lineOffset, bitOffset,
                                   b2 - bitOffset);
                    }
                    bitOffset = a0 = b2;

                    // Set pointer to only consume the correct number of bits.
                    updatePointer(7 - bits);
                } else if (code == 1) { // Horizontal
                    // Set pointer to only consume the correct number of bits.
                    updatePointer(7 - bits);

                    // identify the next 2 alternating color codes.
                    int number;
                    if (isWhite) {
                        // Following are white and black runs
                        number = decodeWhiteCodeWord();
                        bitOffset += number;
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