/// <summary>
/// Gets a byte array that can be used as a /JBIG2Globals,
/// or null if not applicable to the given jbig2.
/// </summary>
/// <param name="ra">an random access file or array</param>
/// <returns>a byte array</returns>
public static byte[] GetGlobalSegment(RandomAccessFileOrArray ra)
{
try {
Jbig2SegmentReader sr = new Jbig2SegmentReader(ra);
sr.Read();
return(sr.GetGlobal(true));
}
catch (Exception) {
return(null);
}
}
public static void ProcessImage(ImageData jbig2)
{
if (jbig2.GetOriginalType() != ImageType.JBIG2)
{
throw new ArgumentException("JBIG2 image expected");
}
Jbig2ImageData image = (Jbig2ImageData)jbig2;
try {
IRandomAccessSource ras;
if (image.GetData() == null)
{
image.LoadData();
}
ras = new RandomAccessSourceFactory().CreateSource(image.GetData());
RandomAccessFileOrArray raf = new RandomAccessFileOrArray(ras);
Jbig2SegmentReader sr = new Jbig2SegmentReader(raf);
sr.Read();
Jbig2SegmentReader.Jbig2Page p = sr.GetPage(image.GetPage());
raf.Close();
image.SetHeight(p.pageBitmapHeight);
image.SetWidth(p.pageBitmapWidth);
image.SetBpc(1);
image.SetColorSpace(1);
//TODO JBIG2 globals caching
byte[] globals = sr.GetGlobal(true);
//TODO due to the fact, that streams now may be transformed to indirect objects only on writing,
//pdfStream.getDocument() cannot longer be the sign of inline/indirect images
// in case inline image pdfStream.getDocument() will be null
if (globals != null)
{
/*&& stream.getDocument() != null*/
IDictionary <String, Object> decodeParms = new Dictionary <String, Object>();
// PdfStream globalsStream = new PdfStream().makeIndirect(pdfStream.getDocument());
// globalsStream.getOutputStream().write(globals);
decodeParms["JBIG2Globals"] = globals;
image.decodeParms = decodeParms;
}
image.SetFilter("JBIG2Decode");
image.SetColorSpace(1);
image.SetBpc(1);
image.data = p.GetData(true);
}
catch (System.IO.IOException e) {
throw new iText.IO.IOException(iText.IO.IOException.Jbig2ImageException, e);
}
}
