Replacing PDF stream content

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Replacing PDF stream content

Replacing PDF stream content

2007-11-07 - By Ismael F

Back

Reply: 1 2 3

Thanks a lot!
I tried It but I think there is something I can't see!
Originally I have the PDF content:
......73 0 obj<</XFA[(preamble)5 0 R(config)6 0 R(template)7 0 R(datasets)8 0 R
(localeSet)9 0 R(PDFSecurity)10 0 R(xmpmeta)11 0 R(xfdf)12 0 R(postamble)13 0 R]
/Fields[2 0 R]/DA(/Helv 0 Tf 0 g )/DR<</Font<</Helv 1 0 R/MyriadPro-Regular 87 0
R>>>>>>endobj...7 0 obj<</Length 22490/Filter[/FlateDecode]/Type/EmbeddedFile>
>stream...endstreamendobj...
There isn't in the PDF any other place that links "7 0" template object than in
"73 0". Then I have the code A): // xfa_element_ind --> "7 0" PdfReader
.killIndirect(xfa_element_ind); PdfStream xfa_stream = new PdfStream(form
_field_property_value); PdfIndirectReference ref = writer.addToBody(xfa_stream
, false).getIndirectReference(); writer.getExtraCatalog().put(PdfName.XFA, ref
);

As a result I get that addresses have been recalculated, an I have the
information duplicated (the new one at "1 0" the original one at "11 0"):...1 0
obj <</Length 42104>>stream ....... endstream...75 0 obj<</XFA[(preamble) 9 0 R
(config) 10 0 R(template) 11 0 R(datasets) 12 0 R(localeSet) 13 0 R(PDFSecurity)
14 0 R(xmpmeta) 15 0 R(xfdf) 16 0 R(postamble) 17 0 R]/Fields[4 0 R]/DR<</Font<
</MyriadPro-Regular 77 0 R/Helv 3 0 R>>>>/DA(/Helv 0 Tf 0 g )>>endobj...11 0 obj
<</Filter[/FlateDecode]/Type/EmbeddedFile/Length 22490>>stream..
.endstreamendobj...
With next code B): // xfa_element_ind --> "7 0" PdfReader.killIndirect
(xfa_element_ind); PdfStream xfa_stream = new PdfStream(form_field_property
_value); PdfIndirectReference ref = writer.addToBody(xfa_stream, xfa_element
_ind, false).getIndirectReference(); writer.getExtraCatalog().put(PdfName.XFA
, ref);
I get the resultant PDF content:...7 0 obj <</Length 42104>>stream .......
endstream...74 0 obj<</XFA[(preamble) 8 0 R(config) 9 0 R(template) 10 0 R
(datasets) 11 0 R(localeSet) 12 0 R(PDFSecurity) 13 0 R(xmpmeta) 14 0 R(xfdf) 15
0 R(postamble) 16 0 R]/Fields[3 0 R]/DR<</Font<</MyriadPro-Regular 76 0 R/Helv
2 0 R>>>>/DA(/Helv 0 Tf 0 g )>>endobj...10 0 obj <</Filter[/FlateDecode]/Type
/EmbeddedFile/Length 22490>>stream...endstreamendobj...
This code is the same as A: // xfa_element_ind --> "7 0"
PdfIndirectReference ref = writer.addToBody(xfa_stream, false)
.getIndirectReference(); PdfReader.killIndirect(xfa_element_ind); writer
.getExtraCatalog().put(PdfName.XFA, ref); An this one is
like B: // xfa_element_ind --> "7 0" PdfIndirectReference ref = writer
.addToBody(xfa_stream, xfa_element_ind, false).getIndirectReference();
PdfReader.killIndirect(xfa_element_ind); writer.getExtraCatalog().put
(PdfName.XFA, ref);

It's possible to make a direct replacement of stream bytes without changing
references?
Perhaps there is another object that references to "7 0" and 'killIndirect'
takes it into account and makes the recalculation to update it and possible
'xrefs'?

I'm sorry, It's possible that I still haven't understood PDF concepts!

Thanks a lot!
Isma

> Date: Tue, 6 Nov 2007 10:29:59 +0000> From: psoares@(protected)> To: itext
-questions@(protected)> Subject: Re: [iText-questions] Replacing PDF
stream content> > You'll have to delete the old object with PdfReader
.killIndirect(PRIndirectReference).> > Paulo > > > -- --Original Message-- --> >
From: itext-questions-bounces@(protected) > > [mailto:itext-questions
-bounces@(protected)] On > > Behalf Of Ismael F> > Sent: Tuesday,
November 06, 2007 9:58 AM> > To: itext-questions@(protected)> >
Subject: [iText-questions] Replacing PDF stream content> > > > Hello everybody,
> > > > I need to change, replace a whole stream of bytes 'object' > > from a
PDF. In this case those bytes corresponds to a XFA form.> > > > The original
PDF content is like:> > %PDF-1 (See http://PDF-1.ora-code.com).6> > %????> > 1 0 obj <</Type/Metadata/...> > ..
.> > ...> > 10 0 obj <</Filter[/FlateDecode]/Type/EmbeddedFile/Length > > 22459>
>stream ... endstream> > 11 0 obj .......> > ...> > > > So I use this piece of
code:> > PdfIndirectReference ref = writer.addToBody(new > > PdfStream(form
_field_property_value), xfa_element_ind, > > false).getIndirectReference();> >
writer.getExtraCatalog().put(PdfName.XFA, ref);> > > > where "xfa_element_ind"
is "10 0", and corresponds to the > > bytes adress that I want to replace.> > >
> As a result I get this PDF content:> > %PDF-1 (See http://PDF-1.ora-code.com).6> > %????> > 10 0 obj <<
/Length 42101>>stream ... endstream> > 1 0 obj <</Type/Metadata/...> > ...> > ..
.> > ...> > 10 0 obj <</Filter[/FlateDecode]/Type/EmbeddedFile/Length > > 22459>
>stream ... endstream> > 11 0 obj .......> > ...> > > > As one can see the
content has not changed/replaced, is > > duplicated and I don't achieve the
desired result.> > > > How can I make a direct substitution/replacement to the
> > stream without duplicating content?> > Is It possible?> > How?> > > > I
tried diferent things but I'm not able to get it!> > > > Thanks a lot!> > >
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<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
FONT-SIZE: 10pt;
FONT-FAMILY:Tahoma
}
</style>
</head>
<body class='hmmessage'>
Thanks a lot! 
I tried It but I think there is something I can't see! 
Originally I have the PDF content: 
... ... 73 0 obj <</XFA[(preamble)5 0 R(config)6 0 R(template)7
0 R(datasets)8 0 R(localeSet)9 0 R(PDFSecurity)10 0 R(xmpmeta)11 0 R(xfdf)12 0
R(postamble)13 0 R]/Fields[2 0 R]/DA(/Helv 0 Tf 0 g )/DR<</Font<<
/Helv 1 0 R/MyriadPro-Regular 87 0 R>>>>>> endobj ... 7 0 obj <</Length 22490/Filter[/FlateDecode]/Type/EmbeddedFile>&gt
;stream ... endstream endobj ... 
 There isn't in the PDF any other place that links "7 0" template object
than in "73 0". Then I have the code A):    // xfa_element_ind --
> "7 0"    PdfReader.killIndirect(xfa_element_ind);  
  PdfStream xfa_stream = new PdfStream(form_field_property_value); 
   PdfIndirectReference ref = writer.addToBody(xfa_stream, false)
.getIndirectReference();    writer.getExtraCatalog().put(PdfName
.XFA, ref); 
  
As a result I get that addresses have been recalculated, an I have the
information duplicated (the new one at "1 0" the original one at "11 0"): ..
. 1 0 obj <</Length 42104>>stream ....... endstream ... 75
0 obj<</XFA[(preamble) 9 0 R(config) 10 0 R(template) 11 0 R(datasets) 12
0 R(localeSet) 13 0 R(PDFSecurity) 14 0 R(xmpmeta) 15 0 R(xfdf) 16 0 R
(postamble) 17 0 R]/Fields[4 0 R]/DR<</Font<</MyriadPro-Regular 77 0
R/Helv 3 0 R>>>>/DA(/Helv 0 Tf 0 g )>>endobj ... 11 0
obj <</Filter[/FlateDecode]/Type/EmbeddedFile/Length 22490>>stream
 ... endstream endobj ... 
 With next code B):     // xfa_element_ind --> "7 0"     PdfReader.killIndirect(xfa_element_ind);   
  PdfStream xfa_stream = new PdfStream(form_field_property_value); 
    PdfIndirectReference ref = writer.addToBody(xfa_stream, xfa
_element_ind, false).getIndirectReference();     writer
.getExtraCatalog().put(PdfName.XFA, ref); 
I get the resultant PDF content: ... 7 0 obj <</Length 42104>&gt
;stream ....... endstream ... 74 0 obj<</XFA[(preamble) 8 0 R(config
) 9 0 R(template) 10 0 R(datasets) 11 0 R(localeSet) 12 0 R(PDFSecurity) 13 0 R
(xmpmeta) 14 0 R(xfdf) 15 0 R(postamble) 16 0 R]/Fields[3 0 R]/DR<>>>/DA(/Helv 0 Tf 0 g )
>> endobj ... 10 0 obj <</Filter[/FlateDecode]/Type
/EmbeddedFile/Length 22490>>stream ... endstream endobj ... 
 This code is the same as A:     // xfa_element_ind -->
"7 0"     PdfIndirectReference ref = writer.addToBody(xfa
_stream, false).getIndirectReference();     PdfReader
.killIndirect(xfa_element_ind);     writer.getExtraCatalog()
.put(PdfName.XFA, ref);          
               
 An this one is like B:     // xfa_element_ind --> "7 0
"     PdfIndirectReference ref = writer.addToBody(xfa_stream,
xfa_element_ind, false).getIndirectReference();     PdfReader
.killIndirect(xfa_element_ind);     writer.getExtraCatalog()
.put(PdfName.XFA, ref); 
  
It's possible to make a direct replacement of stream bytes without changing
references? 
Perhaps there is another object that references to "7 0" and 'killIndirect'
takes it into account and makes the recalculation to update it and possible
'xrefs'? 
  
I'm sorry, It's possible that I still haven't understood PDF concepts! 
  
Thanks a lot! 
 Isma 
  
 > Date: Tue, 6 Nov 2007 10:29:59 +0000 > From: psoares@(protected)
 > To: itext-questions@(protected) > Subject: Re: [iText
-questions] Replacing PDF stream content > > You'll have to delete
the old object with PdfReader.killIndirect(PRIndirectReference). > 
> Paulo > > > -- --Original Message-- -- > > From:
itext-questions-bounces@(protected) > > [mailto:itext
-questions-bounces@(protected)] On > > Behalf Of Ismael F > > Sent: Tuesday, November 06, 2007 9:58 AM > > To: itext
-questions@(protected) > > Subject: [iText-questions]
Replacing PDF stream content > > > > Hello everybody, &gt
; > > > I need to change, replace a whole stream of bytes 'object'
 > > from a PDF. In this case those bytes corresponds to a XFA form. > > > > The original PDF content is like: > > %PDF-1 (See http://PDF-1.ora-code.com).6
 > > %???? > > 1 0 obj <</Type/Metadata/... > >
... > > ... > > 10 0 obj <</Filter[/FlateDecode]/Type
/EmbeddedFile/Length > > 22459>>stream ... endstream > &gt
; 11 0 obj ....... > > ... > > > > So I use this
piece of code: > > PdfIndirectReference ref = writer.addToBody(new > > PdfStream(form_field_property_value), xfa_element_ind, > >
false).getIndirectReference(); > > writer.getExtraCatalog().put
(PdfName.XFA, ref); > > > > where "xfa_element_ind" is "10 0"
, and corresponds to the > > bytes adress that I want to replace. 
> > > > As a result I get this PDF content: > > %PDF-1 (See http://PDF-1.ora-code.com)
.6 > > %???? > > 10 0 obj <</Length 42101>>stream
... endstream > > 1 0 obj <</Type/Metadata/... > > ...
 > > ... > > ... > > 10 0 obj <</Filter[
/FlateDecode]/Type/EmbeddedFile/Length > > 22459>>stream ...
endstream > > 11 0 obj ....... > > ... > > >
> As one can see the content has not changed/replaced, is > >
duplicated and I don't achieve the desired result. > > > >
How can I make a direct substitution/replacement to the > > stream
without duplicating content? > > Is It possible? > > How? 
> > > > I tried diferent things but I'm not able to get it! 
> > > > Thanks a lot! > > > Aviso Legal: 
> Esta mensagem ? destinada exclusivamente ao destinat?rio. Pode conter
informa??o confidencial ou legalmente protegida. A incorrecta transmiss?o desta
mensagem n?o significa a perca de confidencialidade. Se esta mensagem for
recebida por engano, por favor envie-a de volta para o remetente e apague-a do
seu sistema de imediato. ? proibido a qualquer pessoa que n?o o destinat?rio de
usar, revelar ou distribuir qualquer parte desta mensagem. > >
Disclaimer: > This message is destined exclusively to the intended
receiver. It may contain confidential or legally protected information. The
incorrect transmission of this message does not mean the loss of its
confidentiality. If this message is received by mistake, please send it back to
the sender and delete it from your system immediately. It is forbidden to any
person who is not the intended receiver to use, distribute or copy any part of
this message. > > -- ---- ---- ---- ---- ---- ---- ---- ---- -----
-- ---- ---- ---- ---- -- > This SF.net email is sponsored by: Splunk Inc.
 > Still grepping through log files to find problems? Stop. > Now
Search log events and configuration files using AJAX and a browser. >
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