/***
* Gets the number of pages in a JBIG2 image.
* @param ra a random acces file array containing a JBIG2 image
* @return the number of pages
*/
public static int GetNumberOfPages(RandomAccessFileOrArray ra)
{
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.Read();
return(sr.NumberOfPages());
}
/**
* Gets a byte array that can be used as a /JBIG2Globals,
* or null if not applicable to the given jbig2.
* @param ra an random access file or array
* @return a byte array
*/
public static byte[] GetGlobalSegment(RandomAccessFileOrArray ra)
{
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.Read();
return(sr.GetGlobal(true));
} catch {
return(null);
}
}
/**
* returns an Image representing the given page.
* @param ra the file or array containing the image
* @param page the page number of the image
* @return an Image object
*/
public static Image GetJbig2Image(RandomAccessFileOrArray ra, int page)
{
if (page < 1)
{
throw new ArgumentException("The page number must be >= 1.");
}
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.Read();
JBIG2SegmentReader.JBIG2Page p = sr.GetPage(page);
Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.GetData(true), sr.GetGlobal(true));
return(img);
}
public JBIG2Page(int page, JBIG2SegmentReader sr)
{
this.page = page;
this.sr = sr;
}
