public Segment(JBIG2StreamDecoder streamDecoder)
{
this.decoder = streamDecoder;
huffmanDecoder = decoder.getHuffmanDecoder();
arithmeticDecoder = decoder.getArithmeticDecoder();
mmrDecoder = decoder.getMMRDecoder();
}
public byte[] decodeJBIG2(byte[] data, ImageFormat format = ImageFormat.TIFF, int NewWidth = 0, int NewHeight = 0)
{
reader = new Big2StreamReader(data);
resetDecoder();
bool validFile = checkHeader();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("validFile = " + validFile);
}
if (!validFile)
{
/**
* Assume this is a stream from a PDF so there is no file header,
* end of page segments, or end of file segments. Organisation must
* be sequential, and the number of pages is assumed to be 1.
*/
noOfPagesKnown = true;
randomAccessOrganisation = false;
noOfPages = 1;
/** check to see if there is any global data to be read */
if (globalData != null)
{
/** set the reader to read from the global data */
reader = new Big2StreamReader(globalData);
huffmanDecoder = new HuffmanDecoder(reader);
mmrDecoder = new MMRDecoder(reader);
arithmeticDecoder = new ArithmeticDecoder(reader);
/** read in the global data segments */
readSegments();
/** set the reader back to the main data */
reader = new Big2StreamReader(data);
}
else
{
/**
* There's no global data, so move the file pointer back to the
* start of the stream
*/
reader.movePointer(-8);
}
}
else
{
/**
* We have the file header, so assume it is a valid stand-alone
* file.
*/
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== File Header ====");
}
setFileHeaderFlags();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("randomAccessOrganisation = " + randomAccessOrganisation);
Console.WriteLine("noOfPagesKnown = " + noOfPagesKnown);
}
if (noOfPagesKnown)
{
noOfPages = getNoOfPages();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("noOfPages = " + noOfPages);
}
}
}
huffmanDecoder = new HuffmanDecoder(reader);
mmrDecoder = new MMRDecoder(reader);
arithmeticDecoder = new ArithmeticDecoder(reader);
/** read in the main segment data */
readSegments();
//Create Image
var rawimage = findPageSegement(1).getPageBitmap();
int width = (int)rawimage.getWidth();
int height = (int)rawimage.getHeight();
var dataStream = rawimage.getData(true);
var newarray = new byte[dataStream.Length];
Array.Copy(dataStream, newarray, dataStream.Length);
int stride = (width * 1 + 7) / 8;
var bitmap = new WriteableBitmap(width, height, 96, 96, System.Windows.Media.PixelFormats.BlackWhite, null);
bitmap.WritePixels(new System.Windows.Int32Rect(0, 0, width, height), newarray, stride, 0);
MemoryStream stream3 = new MemoryStream();
if (format == ImageFormat.TIFF)
{
var encoder = new TiffBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));
encoder.Save(stream3);
}
else if (format == ImageFormat.JPEG)
{
var encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));
encoder.Save(stream3);
}
if (NewWidth != 0 && NewHeight != 0)
{
var newbitmap = ResizeHelpers.ScaleImage(stream3.ToArray(), NewWidth, NewHeight);
return(newbitmap);
}
return(stream3.ToArray());
}
