iTextSharp.text.Jpeg2000.ProcessParameters C# (CSharp) Метод

        private void ProcessParameters()
        {
            type = JPEG2000;
            originalType = ORIGINAL_JPEG2000;
            inp = null;
            try {
                if (rawData == null){
                    WebRequest w = WebRequest.Create(url);
                    w.Credentials = CredentialCache.DefaultCredentials;
                    inp = w.GetResponse().GetResponseStream();
                }
                else{
                    inp = new MemoryStream(rawData);
                }
                boxLength = Cio_read(4);
                if (boxLength == 0x0000000c) {
                    boxType = Cio_read(4);
                    if (JP2_JP != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.jp.marker"));
                    }
                    if (0x0d0a870a != Cio_read(4)) {
                        throw new IOException(MessageLocalization.GetComposedMessage("error.with.jp.marker"));
                    }

                    Jp2_read_boxhdr();
                    if (JP2_FTYP != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.ftyp.marker"));
                    }
                    Utilities.Skip(inp, boxLength - 8);
                    Jp2_read_boxhdr();
                    do {
                        if (JP2_JP2H != boxType) {
                            if (boxType == JP2_JP2C) {
                                throw new IOException(MessageLocalization.GetComposedMessage("expected.jp2h.marker"));
                            }
                            Utilities.Skip(inp, boxLength - 8);
                            Jp2_read_boxhdr();
                        }
                    } while (JP2_JP2H != boxType);
                    Jp2_read_boxhdr();
                    if (JP2_IHDR != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.ihdr.marker"));
                    }
                    scaledHeight = Cio_read(4);
                    Top = scaledHeight;
                    scaledWidth = Cio_read(4);
                    Right = scaledWidth;
                    bpc = -1;
                }
                else if ((uint)boxLength == 0xff4fff51) {
                    Utilities.Skip(inp, 4);
                    int x1 = Cio_read(4);
                    int y1 = Cio_read(4);
                    int x0 = Cio_read(4);
                    int y0 = Cio_read(4);
                    Utilities.Skip(inp, 16);
                    colorspace = Cio_read(2);
                    bpc = 8;
                    scaledHeight = y1 - y0;
                    Top = scaledHeight;
                    scaledWidth = x1 - x0;
                    Right = scaledWidth;
                }
                else {
                    throw new IOException(MessageLocalization.GetComposedMessage("not.a.valid.jpeg2000.file"));
                }
            }
            finally {
                if (inp != null) {
                    try{inp.Close();}catch{}
                    inp = null;
                }
            }
            plainWidth = this.Width;
            plainHeight = this.Height;
        }