private void decodeTemplate()

in src/main/java/org/apache/pdfbox/jbig2/segments/GenericRefinementRegion.java [300:480]
166 lines of code
48 McCabe index (conditional complexity)

    private void decodeTemplate(final int lineNumber, final int width, final int rowStride,
            final int refRowStride, final int paddedWidth, final int deltaRefStride,
            final int lineOffset, int byteIndex, final int currentLine, int refByteIndex,
            Template templateFormation) throws IOException
    {
        short c1, c2, c3, c4, c5;

        int w1, w2, w3, w4;
        w1 = w2 = w3 = w4 = 0;

        if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
            w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
        if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
            w2 = referenceBitmap.getByteAsInteger(refByteIndex);
        if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
            w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
        refByteIndex++;

        if (lineNumber >= 1)
        {
            w4 = regionBitmap.getByteAsInteger(byteIndex - rowStride);
        }
        byteIndex++;

        final int modReferenceDX = referenceDX % 8;
        final int shiftOffset = 6 + modReferenceDX;
        final int modRefByteIdx = refByteIndex % refRowStride;

        if (shiftOffset >= 0)
        {
            c1 = (short) ((shiftOffset >= 8 ? 0 : w1 >>> shiftOffset) & 0x07);
            c2 = (short) ((shiftOffset >= 8 ? 0 : w2 >>> shiftOffset) & 0x07);
            c3 = (short) ((shiftOffset >= 8 ? 0 : w3 >>> shiftOffset) & 0x07);
            if (shiftOffset == 6 && modRefByteIdx > 1)
            {
                if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
                {
                    c1 |= referenceBitmap.getByteAsInteger(refByteIndex - refRowStride - 2) << 2
                            & 0x04;
                }
                if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                {
                    c2 |= referenceBitmap.getByteAsInteger(refByteIndex - 2) << 2 & 0x04;
                }
                if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
                {
                    c3 |= referenceBitmap.getByteAsInteger(refByteIndex + refRowStride - 2) << 2
                            & 0x04;
                }
            }
            if (shiftOffset == 0)
            {
                w1 = w2 = w3 = 0;
                if (modRefByteIdx < refRowStride - 1)
                {
                    if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
                        w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
                    if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                        w2 = referenceBitmap.getByteAsInteger(refByteIndex);
                    if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
                        w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
                }
                refByteIndex++;
            }
        }
        else
        {
            c1 = (short) ((w1 << 1) & 0x07);
            c2 = (short) ((w2 << 1) & 0x07);
            c3 = (short) ((w3 << 1) & 0x07);
            w1 = w2 = w3 = 0;
            if (modRefByteIdx < refRowStride - 1)
            {
                if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
                    w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
                if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                    w2 = referenceBitmap.getByteAsInteger(refByteIndex);
                if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
                    w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
                refByteIndex++;
            }
            c1 |= (short) ((w1 >>> 7) & 0x07);
            c2 |= (short) ((w2 >>> 7) & 0x07);
            c3 |= (short) ((w3 >>> 7) & 0x07);
        }

        c4 = (short) (w4 >>> 6);
        c5 = 0;

        final int modBitsToTrim = (2 - modReferenceDX) % 8;
        w1 <<= modBitsToTrim;
        w2 <<= modBitsToTrim;
        w3 <<= modBitsToTrim;

        w4 <<= 2;

        for (int x = 0; x < width; x++)
        {
            final int minorX = x & 0x07;

            final short tval = templateFormation.form(c1, c2, c3, c4, c5);

            if (override)
            {
                cx.setIndex(overrideAtTemplate0(tval, x, lineNumber,
                        regionBitmap.getByte(regionBitmap.getByteIndex(x, lineNumber)), minorX));
            }
            else
            {
                cx.setIndex(tval);
            }
            final int bit = arithDecoder.decode(cx);
            regionBitmap.setPixel(x, lineNumber, (byte) bit);

            c1 = (short) (((c1 << 1) | 0x01 & (w1 >>> 7)) & 0x07);
            c2 = (short) (((c2 << 1) | 0x01 & (w2 >>> 7)) & 0x07);
            c3 = (short) (((c3 << 1) | 0x01 & (w3 >>> 7)) & 0x07);
            c4 = (short) (((c4 << 1) | 0x01 & (w4 >>> 7)) & 0x07);
            c5 = (short) bit;

            if ((x - referenceDX) % 8 == 5)
            {
                if (((x - referenceDX) / 8) + 1 >= referenceBitmap.getRowStride())
                {
                    w1 = w2 = w3 = 0;
                }
                else
                {
                    if (currentLine >= 1 && (currentLine - 1 < referenceBitmap.getHeight()))
                    {
                        w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
                    }
                    else
                    {
                        w1 = 0;
                    }
                    if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                    {
                        w2 = referenceBitmap.getByteAsInteger(refByteIndex);
                    }
                    else
                    {
                        w2 = 0;
                    }
                    if (currentLine >= -1 && (currentLine + 1) < referenceBitmap.getHeight())
                    {
                        w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
                    }
                    else
                    {
                        w3 = 0;
                    }
                }
                refByteIndex++;
            }
            else
            {
                w1 <<= 1;
                w2 <<= 1;
                w3 <<= 1;
            }

            if (minorX == 5 && lineNumber >= 1)
            {
                if ((x >> 3) + 1 >= regionBitmap.getRowStride())
                {
                    w4 = 0;
                }
                else
                {
                    w4 = regionBitmap.getByteAsInteger(byteIndex - rowStride);
                }
                byteIndex++;
            }
            else
            {
                w4 <<= 1;
            }

        }
    }