BitMiracle.LibJpeg.Classic.Internal.jpeg_marker_reader.get_interesting_appn C# (CSharp) Method

        private static bool get_interesting_appn(jpeg_decompress_struct cinfo)
        {
            int length;
            if (!cinfo.m_src.GetTwoBytes(out length))
                return false;

            length -= 2;

            /* get the interesting part of the marker data */
            int numtoread = 0;
            if (length >= APPN_DATA_LEN)
                numtoread = APPN_DATA_LEN;
            else if (length > 0)
                numtoread = length;

            byte[] b = new byte[APPN_DATA_LEN];
            for (int i = 0; i < numtoread; i++)
            {
                int temp = 0;
                if (!cinfo.m_src.GetByte(out temp))
                    return false;

                b[i] = (byte)temp;
            }

            length -= numtoread;

            /* process it */
            switch ((JPEG_MARKER)cinfo.m_unread_marker)
            {
                case JPEG_MARKER.APP0:
                    examine_app0(cinfo, b, numtoread, length);
                    break;
                case JPEG_MARKER.APP14:
                    examine_app14(cinfo, b, numtoread, length);
                    break;
                default:
                    /* can't get here unless jpeg_save_markers chooses wrong processor */
                    cinfo.ERREXIT(J_MESSAGE_CODE.JERR_UNKNOWN_MARKER, cinfo.m_unread_marker);
                    break;
            }

            /* skip any remaining data -- could be lots */
            if (length > 0)
                cinfo.m_src.skip_input_data(length);

            return true;
        }