JBIG2: How to remove page from JBIG2 document?

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Page of JBIG2 document can be removed:

virtually - page removed from catalog of JBIG2 document, not all page data is removed i.e. size of JBIG2 document is not minimal
physically - page removed from catalog of JBIG2 document, all page data removed

Here is C#/VB.NET code that shows how to "virtually" remove page from JBIG2 document:

public void RemovePageFromJbig2FileVirtually(System.IO.Stream stream, int pageIndex)
{
    // open JBIG2 file
    using (Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2File = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File(stream))
    {
        // remove page at specified index
        jbig2File.Pages.RemoveAt(pageIndex);

        // save changes
        jbig2File.SaveChanges();
    }
}

VB.NET

Public Sub RemovePageFromJbig2FileVirtually(stream As System.IO.Stream, pageIndex As Integer)
    ' open JBIG2 file
    Using jbig2File As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File(stream)
        ' remove page at specified index
        jbig2File.Pages.RemoveAt(pageIndex)

        ' save changes
        jbig2File.SaveChanges()
    End Using
End Sub

Here is C#/VB.NET code that shows how to "physically" remove page from JBIG2 document:

public void RemovePageFromJbig2FilePhysically(System.IO.Stream stream, int pageIndex, 
    System.IO.Stream outputStream)
{
    // open JBIG2 file
    using (Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2File = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File(stream))
    {
        // remove page at specified index
        jbig2File.Pages.RemoveAt(pageIndex);

        // save modified JBIG2 file to the outputStream,
        // the source JBIG2 file is not changed
        jbig2File.Pack(outputStream);
    }
}

VB.NET

Public Sub RemovePageFromJbig2FilePhysically(stream As System.IO.Stream, pageIndex As Integer, outputStream As System.IO.Stream)
    ' open JBIG2 file
    Using jbig2File As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File(stream)
        ' remove page at specified index
        jbig2File.Pages.RemoveAt(pageIndex)

        ' save modified JBIG2 file to the outputStream,
        ' the source JBIG2 file is not changed
        jbig2File.Pack(outputStream)
    End Using
End Sub

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