BitMiracle.Tiff2Pdf.T2P.read_tiff_size C# (CSharp) Method

        private void read_tiff_size(Tiff input)
        {
            if (m_pdf_transcode == t2p_transcode_t.T2P_TRANSCODE_RAW)
            {
                FieldValue[] result = null;
                if (m_pdf_compression == t2p_compress_t.T2P_COMPRESS_G4)
                {
                    result = input.GetField(TiffTag.STRIPBYTECOUNTS);
                    int[] sbc = result[0].ToIntArray();
                    m_tiff_datasize = sbc[0];
                    return;
                }

                if (m_pdf_compression == t2p_compress_t.T2P_COMPRESS_ZIP)
                {
                    result = input.GetField(TiffTag.STRIPBYTECOUNTS);
                    int[] sbc = result[0].ToIntArray();
                    m_tiff_datasize = sbc[0];
                    return;
                }

                if (m_tiff_compression == Compression.JPEG)
                {
                    result = input.GetField(TiffTag.JPEGTABLES);
                    if (result != null)
                    {
                        int count = result[0].ToInt();
                        if (count > 4)
                        {
                            m_tiff_datasize += count;
                            m_tiff_datasize -= 2; /* don't use EOI of header */
                        }
                    }
                    else
                    {
                        m_tiff_datasize = 2; /* SOI for first strip */
                    }

                    int stripcount = input.NumberOfStrips();
                    int[] sbc = null;
                    result = input.GetField(TiffTag.STRIPBYTECOUNTS);
                    if (result == null)
                    {
                        Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE,
                            "Input file {0} missing field: STRIPBYTECOUNTS",
                            input.FileName());
                        m_error = true;
                        return;
                    }
                    else
                        sbc = result[0].ToIntArray();

                    for (int i = 0; i < stripcount; i++)
                    {
                        m_tiff_datasize += sbc[i];
                        m_tiff_datasize -= 4; /* don't use SOI or EOI of strip */
                    }

                    m_tiff_datasize += 2; /* use EOI of last strip */
                    return;
                }
            }

            m_tiff_datasize = input.ScanlineSize() * m_tiff_length;
            if (m_tiff_planar == PlanarConfig.SEPARATE)
                m_tiff_datasize *= m_tiff_samplesperpixel;
        }