PdfStamperImp enhancements for keeping the integrity of the original PDF

["Paulo Soares" <psoares (at) consiste.pt>]

That's already possible with PdfStamper. 

> -----Original Message-----
> From: itext-questions-admin (at) lists.sourceforge.net 
> [mailto:itext-questions-admin (at) lists.sourceforge.net] On 
> Behalf Of Tenesi
> Sent: Thursday, February 09, 2006 11:14 AM
> To: itext-questions (at) lists.sourceforge.net
> Subject: [iText-questions] PdfStamperImp enhancements for 
> keeping the integrity of the original PDF
> 
> Hello everybody,
> 
> My aim is to add one page from a Pdf to  another Pdf without 
> touching its previous content (incremental update). For that 
> the Catalog, Pages tree and some other objects should be 
> updated into new xref-ref table for sure. The idea is not to 
> touch the previosu structure (PdfCopy or PdfCopyFields are 
> not approperiate) because it might have been signed and we 
> don't want to invalidated the byteranges.
> 
> Q1: Is this a right assumption or it can be done with the 
> current library without changes?
> 
> 
> Reading the documentation and looking into the source codes 
> of PdfStamper, PdfStamperImp and PdfContentByte, It seems 
> some refactoring is needed to overcome the restrictions to be 
> able to do this. I tried to use the followin code at the user 
> application level:
> 
> 
>  com.lowagie.text.pdf.PdfReader pr = new 
> com.lowagie.text.pdf.PdfReader("originalfiletobe updated.pdf"); 
>  com.lowagie.text.pdf.PdfStamper update = new 
> com.lowagie.text.pdf.PdfStamper(pr, os, '\0',true);
>     
>  com.lowagie.text.pdf.PdfReader reader2 = new 
> com.lowagie.text.pdf.PdfReader(baos.toByteArray());
>  com.lowagie.text.pdf.PdfStamperImp stamperImp 
> =(com.lowagie.text.pdf.PdfStamperImp)update.getWriter();
>  
> stamperImp.newPage();
> com.lowagie.text.pdf.PdfContentByte directContent = 
> update.getWriter().getDirectContent();
> directContent.reset();
> com.lowagie.text.pdf.PdfImportedPage ipage= 
> update.getImportedPage(reader2,1);
> directContent.addTemplate(ipage, 1, 0, 0, 1, 0, 
> 0,stamperImp.getPageStamp(pr.getNumberOfPages()));
> update.close();
> 
> 
> It obviously will not work as the way StamperImp initializes 
> and keeps track of its pageResources is not the way the 
> PdfContentByte is designed to follow (It rather awaits this 
> info be encapsulated in a PdfDocument instance)
> 
> 
> Q2: Does the code  suffer an understanding problem or it 
> might had made sense, provided that the pageResources were 
> set properly? Is there a work around for this or anybody know 
> of a possibility to overcome this problem?
> 
> 
> Q3: What would you suggest to do to achieve this goal of 
> "ADDING" a page (or some other extra info which needs  
> updating  previous objects in the pdf document (Catalog/ 
> Pages ...) ) to a Pdf deploying the incremental update 
> possibilty provided in PDF-Specifications?
> 
> 
> Tnx
> Tenesi
> 
> -- 
> 
> 
> 


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