static long[] getArrayLongShort(TiffDirectory dir, int tag)
        {
            TiffField field = dir.GetField(tag);

            if (field == null)
            {
                return(null);
            }
            long[] offset;
            if (field.GetType() == TiffField.TIFF_LONG)
            {
                offset = field.GetAsLongs();
            }
            else
            { // must be short
                char[] temp = field.GetAsChars();
                offset = new long[temp.Length];
                for (int k = 0; k < temp.Length; ++k)
                {
                    offset[k] = temp[k];
                }
            }
            return(offset);
        }
        protected static Image GetTiffImageColor(TiffDirectory dir, RandomAccessFileOrArray s)
        {
            int            predictor   = 1;
            TifflzwDecoder lzwDecoder  = null;
            int            compression = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_COMPRESSION);

            switch (compression)
            {
            case TiffConstants.COMPRESSION_NONE:
            case TiffConstants.COMPRESSION_LZW:
            case TiffConstants.COMPRESSION_PACKBITS:
            case TiffConstants.COMPRESSION_DEFLATE:
            case TiffConstants.COMPRESSION_ADOBE_DEFLATE:
            case TiffConstants.COMPRESSION_OJPEG:
            case TiffConstants.COMPRESSION_JPEG:
                break;

            default:
                throw new InvalidOperationException("The compression " + compression + " is not supported.");
            }
            int photometric = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_PHOTOMETRIC);

            switch (photometric)
            {
            case TiffConstants.PHOTOMETRIC_MINISWHITE:
            case TiffConstants.PHOTOMETRIC_MINISBLACK:
            case TiffConstants.PHOTOMETRIC_RGB:
            case TiffConstants.PHOTOMETRIC_SEPARATED:
            case TiffConstants.PHOTOMETRIC_PALETTE:
                break;

            default:
                if (compression != TiffConstants.COMPRESSION_OJPEG && compression != TiffConstants.COMPRESSION_JPEG)
                {
                    throw new InvalidOperationException("The photometric " + photometric + " is not supported.");
                }
                break;
            }
            float rotation = 0;

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_ORIENTATION))
            {
                int rot = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_ORIENTATION);
                if (rot == TiffConstants.ORIENTATION_BOTRIGHT || rot == TiffConstants.ORIENTATION_BOTLEFT)
                {
                    rotation = (float)Math.PI;
                }
                else if (rot == TiffConstants.ORIENTATION_LEFTTOP || rot == TiffConstants.ORIENTATION_LEFTBOT)
                {
                    rotation = (float)(Math.PI / 2.0);
                }
                else if (rot == TiffConstants.ORIENTATION_RIGHTTOP || rot == TiffConstants.ORIENTATION_RIGHTBOT)
                {
                    rotation = -(float)(Math.PI / 2.0);
                }
            }

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_PLANARCONFIG) &&
                dir.GetFieldAsLong(TiffConstants.TIFFTAG_PLANARCONFIG) == TiffConstants.PLANARCONFIG_SEPARATE)
            {
                throw new InvalidOperationException("Planar images are not supported.");
            }
            if (dir.IsTagPresent(TiffConstants.TIFFTAG_EXTRASAMPLES))
            {
                throw new InvalidOperationException("Extra samples are not supported.");
            }
            int samplePerPixel = 1;

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_SAMPLESPERPIXEL)) // 1,3,4
            {
                samplePerPixel = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_SAMPLESPERPIXEL);
            }
            int bitsPerSample = 1;

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_BITSPERSAMPLE))
            {
                bitsPerSample = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_BITSPERSAMPLE);
            }
            switch (bitsPerSample)
            {
            case 1:
            case 2:
            case 4:
            case 8:
                break;

            default:
                throw new InvalidOperationException("Bits per sample " + bitsPerSample + " is not supported.");
            }
            Image img = null;

            int h              = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGELENGTH);
            int w              = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGEWIDTH);
            int dpiX           = 0;
            int dpiY           = 0;
            int resolutionUnit = TiffConstants.RESUNIT_INCH;

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_RESOLUTIONUNIT))
            {
                resolutionUnit = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_RESOLUTIONUNIT);
            }
            dpiX = getDpi(dir.GetField(TiffConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
            dpiY = getDpi(dir.GetField(TiffConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
            int       fillOrder      = 1;
            bool      reverse        = false;
            TiffField fillOrderField = dir.GetField(TiffConstants.TIFFTAG_FILLORDER);

            if (fillOrderField != null)
            {
                fillOrder = fillOrderField.GetAsInt(0);
            }
            reverse = (fillOrder == TiffConstants.FILLORDER_LSB2MSB);
            int rowsStrip = h;

            if (dir.IsTagPresent(TiffConstants.TIFFTAG_ROWSPERSTRIP)) //another hack for broken tiffs
            {
                rowsStrip = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_ROWSPERSTRIP);
            }
            if (rowsStrip <= 0 || rowsStrip > h)
            {
                rowsStrip = h;
            }
            long[] offset = getArrayLongShort(dir, TiffConstants.TIFFTAG_STRIPOFFSETS);
            long[] size   = getArrayLongShort(dir, TiffConstants.TIFFTAG_STRIPBYTECOUNTS);
            if ((size == null || (size.Length == 1 && (size[0] == 0 || size[0] + offset[0] > s.Length))) && h == rowsStrip)
            { // some TIFF producers are really lousy, so...
                size = new long[] { s.Length - (int)offset[0] };
            }
            if (compression == TiffConstants.COMPRESSION_LZW)
            {
                TiffField predictorField = dir.GetField(TiffConstants.TIFFTAG_PREDICTOR);
                if (predictorField != null)
                {
                    predictor = predictorField.GetAsInt(0);
                    if (predictor != 1 && predictor != 2)
                    {
                        throw new InvalidOperationException("Illegal value for Predictor in TIFF file.");
                    }
                    if (predictor == 2 && bitsPerSample != 8)
                    {
                        throw new InvalidOperationException(bitsPerSample + "-bit samples are not supported for Horizontal differencing Predictor.");
                    }
                }
                lzwDecoder = new TifflzwDecoder(w, predictor,
                                                samplePerPixel);
            }
            int                   rowsLeft = h;
            MemoryStream          stream   = null;
            ZDeflaterOutputStream zip      = null;
            Ccittg4Encoder        g4       = null;

            if (bitsPerSample == 1 && samplePerPixel == 1)
            {
                g4 = new Ccittg4Encoder(w);
            }
            else
            {
                stream = new MemoryStream();
                if (compression != TiffConstants.COMPRESSION_OJPEG && compression != TiffConstants.COMPRESSION_JPEG)
                {
                    zip = new ZDeflaterOutputStream(stream);
                }
            }
            if (compression == TiffConstants.COMPRESSION_OJPEG)
            {
                // Assume that the TIFFTAG_JPEGIFBYTECOUNT tag is optional, since it's obsolete and
                // is often missing

                if ((!dir.IsTagPresent(TiffConstants.TIFFTAG_JPEGIFOFFSET)))
                {
                    throw new IOException("Missing tag(s) for OJPEG compression.");
                }
                int jpegOffset = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_JPEGIFOFFSET);
                int jpegLength = s.Length - jpegOffset;

                if (dir.IsTagPresent(TiffConstants.TIFFTAG_JPEGIFBYTECOUNT))
                {
                    jpegLength = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_JPEGIFBYTECOUNT) +
                                 (int)size[0];
                }

                byte[] jpeg = new byte[Math.Min(jpegLength, s.Length - jpegOffset)];

                int posFilePointer = s.FilePointer;
                posFilePointer += jpegOffset;
                s.Seek(posFilePointer);
                s.ReadFully(jpeg);
                img = new Jpeg(jpeg);
            }
            else if (compression == TiffConstants.COMPRESSION_JPEG)
            {
                if (size.Length > 1)
                {
                    throw new IOException("Compression JPEG is only supported with a single strip. This image has " + size.Length + " strips.");
                }
                byte[] jpeg = new byte[(int)size[0]];
                s.Seek(offset[0]);
                s.ReadFully(jpeg);
                img = new Jpeg(jpeg);
            }
            else
            {
                for (int k = 0; k < offset.Length; ++k)
                {
                    byte[] im = new byte[(int)size[k]];
                    s.Seek(offset[k]);
                    s.ReadFully(im);
                    int    height = Math.Min(rowsStrip, rowsLeft);
                    byte[] outBuf = null;
                    if (compression != TiffConstants.COMPRESSION_NONE)
                    {
                        outBuf = new byte[(w * bitsPerSample * samplePerPixel + 7) / 8 * height];
                    }
                    if (reverse)
                    {
                        TiffFaxDecoder.ReverseBits(im);
                    }
                    switch (compression)
                    {
                    case TiffConstants.COMPRESSION_DEFLATE:
                    case TiffConstants.COMPRESSION_ADOBE_DEFLATE:
                        Inflate(im, outBuf);
                        break;

                    case TiffConstants.COMPRESSION_NONE:
                        outBuf = im;
                        break;

                    case TiffConstants.COMPRESSION_PACKBITS:
                        DecodePackbits(im, outBuf);
                        break;

                    case TiffConstants.COMPRESSION_LZW:
                        lzwDecoder.Decode(im, outBuf, height);
                        break;
                    }
                    if (bitsPerSample == 1 && samplePerPixel == 1)
                    {
                        g4.Fax4Encode(outBuf, height);
                    }
                    else
                    {
                        zip.Write(outBuf, 0, outBuf.Length);
                    }
                    rowsLeft -= rowsStrip;
                }
                if (bitsPerSample == 1 && samplePerPixel == 1)
                {
                    img = Image.GetInstance(w, h, false, Element.CCITTG4,
                                            photometric == TiffConstants.PHOTOMETRIC_MINISBLACK ? Element.CCITT_BLACKIS1 : 0, g4.Close());
                }
                else
                {
                    zip.Close();
                    img          = Image.GetInstance(w, h, samplePerPixel, bitsPerSample, stream.ToArray());
                    img.Deflated = true;
                }
            }
            img.SetDpi(dpiX, dpiY);
            if (compression != TiffConstants.COMPRESSION_OJPEG && compression != TiffConstants.COMPRESSION_JPEG)
            {
                if (dir.IsTagPresent(TiffConstants.TIFFTAG_ICCPROFILE))
                {
                    try
                    {
                        TiffField  fd      = dir.GetField(TiffConstants.TIFFTAG_ICCPROFILE);
                        IccProfile iccProf = IccProfile.GetInstance(fd.GetAsBytes());
                        if (samplePerPixel == iccProf.NumComponents)
                        {
                            img.TagIcc = iccProf;
                        }
                    }
                    catch
                    {
                        //empty
                    }
                }
                if (dir.IsTagPresent(TiffConstants.TIFFTAG_COLORMAP))
                {
                    TiffField fd      = dir.GetField(TiffConstants.TIFFTAG_COLORMAP);
                    char[]    rgb     = fd.GetAsChars();
                    byte[]    palette = new byte[rgb.Length];
                    int       gColor  = rgb.Length / 3;
                    int       bColor  = gColor * 2;
                    for (int k = 0; k < gColor; ++k)
                    {
                        palette[k * 3]     = (byte)(rgb[k] >> 8);
                        palette[k * 3 + 1] = (byte)(rgb[k + gColor] >> 8);
                        palette[k * 3 + 2] = (byte)(rgb[k + bColor] >> 8);
                    }
                    PdfArray indexed = new PdfArray();
                    indexed.Add(PdfName.Indexed);
                    indexed.Add(PdfName.Devicergb);
                    indexed.Add(new PdfNumber(gColor - 1));
                    indexed.Add(new PdfString(palette));
                    PdfDictionary additional = new PdfDictionary();
                    additional.Put(PdfName.Colorspace, indexed);
                    img.Additional = additional;
                }
                img.OriginalType = Image.ORIGINAL_TIFF;
            }
            if (photometric == TiffConstants.PHOTOMETRIC_MINISWHITE)
            {
                img.Inverted = true;
            }
            if (rotation.ApproxNotEqual(0))
            {
                img.InitialRotation = rotation;
            }
            return(img);
        }