Thanks Paolo, but is not so easy. Some signatures don't cover all the document, but continue beeing valid ones.
I think iText does not cover all possible cases involving signature validation...
-----Missatge original-----
De:
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Enviat: miércoles, 21 de octubre de 2009 21:24
Per a:
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Tema: iText-questions Digest, Vol 41, Issue 78
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Today's Topics:
1. Re: PDF signature validation problems (Paulo Soares)
2. Re: iText Font (1T3XT info)
3. How to set the page number of a specific page? (Sorin Marti)
4. Re: Help (thulasi ram)
5. Re: Modifying the value of forms in a PDF document, update!
(Brown, Berlin [GCG-PFS])
----------------------------------------------------------------------
Message: 1
Date: Wed, 21 Oct 2009 17:44:32 +0100
From: Paulo Soares <
psoares@...>
Subject: Re: [iText-questions] PDF signature validation problems
To: Post all your questions about iText here
<
itext-questions@...>
Message-ID:
<
0CFE9E34DD5AC241AB9092ABD1F391FF27FFEB17E6@...>
Content-Type: text/plain; charset="utf-8"
There's a method in AcroFields to check if the signature covers all the document. If it doesn't you may flag it as invalid.
Paulo
> -----Original Message-----
> From: ?urea Alcaide [mailto:
aalcaide@...]
> Sent: Wednesday, October 21, 2009 5:16 PM
> To:
itext-questions@...
> Subject: [iText-questions] PDF signature validation problems
>
> Hi all,
>
>
>
> I have come to a problem about the validation of PDF
> signatures. The extraction of the signed data from the PDF is
> not the same with iText than with Adobe.
>
> If I?m not wrong, iText takes the ?/ByteRange? associated to
> a signature to calculate the digest of the data. In some
> cases, is possible to modify the data of the PDF (for example
> with form?s fields), without these changes affecting the
> ByteRange. But the visualization of the document changes, so
> if there is a signature which covers that form field, the
> signature should be considered invalid. If the changes in the
> form field are included at the end of the document, it does
> not affect the ByteRange, so iText is not able to detect
> these changes. The problem is that Adobe does. So, Adobe and
> iText are returning different validation results.
>
>
>
> In the attachment, I send you 2 documents, for making it more
> understandable:
>
>
>
> test1.pdf ? PDF document certified and with 2 signatures,
> each one covering different parts of the form.
>
> test2.pdf ? The same PDF but with the form field ?Name?
> modified. iText says all signatures are valid. Adobe
> recognizes the changes, and invalidates the signature which
> covers that form field. If you look inside the PDF, you will
> see that changes are included at the end of the document, so
> do not affect the ByteRanges of any signature.
>
>
>
> My question is if has someone else got this problem, and if
> so, if there is any way to reach it within the actual iText
> last version? Or we will have to wait to a future
> implementation of the feature? If it is an actual bug, will
> it be reached in the future?
>
>
>
> Thanks in advance to you all,
>
>
>
> ?urea
>
>
>
>
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------------------------------
Message: 2
Date: Wed, 21 Oct 2009 19:00:30 +0200
From: 1T3XT info <
info@...>
Subject: Re: [iText-questions] iText Font
To: Post all your questions about iText here
<
itext-questions@...>
Message-ID: <
4ADF3E2E.3090402@...>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Greg Tomkins wrote:
> Good Afternoon,
>
> I do not see this question covered anywhere:
>
> I want to have a basic table but (in some cases) I want the size of the
> font used to render text within cells to shrink to fit the column width,
> rather than wrap onto a second line or otherwise expand the size of the
> cell. Any thoughts on this?
This can't be done automatically.
You need to define absolute column widths (no relative values, no width
percentage for the table). Then you need to measure each piece of text
you're adding to a cell. If the length < the column width, you either
choose a smaller font (this is preferred), or you scale the Chunk (if
the scaling factor doesn't deform the text too much).
Another way to do this, is to use empty cells with a fixed height, and
to pass the content to a cell event. The cell event gets a Rectangle
object defining the size and position of the cell. There are different
ways to fit the content in such a rectangle.
> Bruno, if you read this, congratulations on a truly outstanding book.
> And probably outstanding product, too, though I am just starting with it.
A second edition is been written as we speak. It will be totally
different from the first book, the aim is to have a complementary book
that covers the same topics, but from a different angle (including the
new features that have been added in the last 3 years).
--
This answer is provided by 1T3XT BVBA
http://www.1t3xt.com/ -
http://www.1t3xt.info------------------------------
Message: 3
Date: Wed, 21 Oct 2009 19:29:08 +0200
From: Sorin Marti <
sorin.marti@...>
Subject: [iText-questions] How to set the page number of a specific
page?
To: Post all your questions about iText here
<
itext-questions@...>
Message-ID:
<
d41c3bd10910211029k4edf909bs9928b3048dc42fb8@...>
Content-Type: text/plain; charset=ISO-8859-1
Hi all
I have a generated document where I like to have a table of contents
with page links.
This works fine when i generate the toc as last page and then reorder
the pages, shifting the last page (toc) to the second (page after
title page).
Right after creating the document and getting the writer instance i
set the page Event
writer.setPageEvent(new MyHeaderFooter(<various unrelated params>);
In the MyHeaderFooter class I override the onEndPage method.
public void onEndPage(final PdfWriter writer, final Document document) {
// code to print header and footer
if(printPageNumber) {
// I print out the page number here
}
}
In the printed document i see the page numbers as following:
1
[number of last page]
3
4
[and so on to last page]
I would like now to change the [number of last page] to 2, so I can
print it. I helped myself with just not printing the page number on
the page by setting a member variable in MyHeaderFooter before
printing the toc at the end...
But i really would like to print the number if possible.
So: How can I set a page number to a specific page?
Thanks for any hint
Sorin
------------------------------
Message: 4
Date: Wed, 21 Oct 2009 14:10:53 -0500
From: thulasi ram <
pthulasiram@...>
Subject: Re: [iText-questions] Help
To: Post all your questions about iText here
<
itext-questions@...>
Message-ID:
<
9cdb19f30910211210u40e9e1a2u3413fac1b9ab0b1a@...>
Content-Type: text/plain; charset="iso-8859-1"
Thanks for ur response.
I have one more issue.
I have multipage color tiff, while i'm using Image.*getInstance write to pdf
file always getting single page pdf file.*
**
*If i'll use *Image.*getInstance i can able to read color tiff images but
i'm not able to create multipage pdf file.*
*If I'll use *Image.*getTiffImage i can't able to read color tiff iamges. *
*Can any one let me know how get multipage pdf file using **Image.getInstance.
Its posible to color Tiff to pdf file using iText?*
*Here is my code.*
tempFile = new File(finalPath);
FileOutputStream fileOutputStream = new FileOutputStream(tempFile);
byte[] read = new byte[input.available()];
File cacheFile = new File(finalPath1);
FileOutputStream bos = new FileOutputStream(cacheFile);
ByteArrayOutputStream outfile = new ByteArrayOutputStream();
Document document = new Document(PageSize.A4.rotate());
PdfWriter writer = PdfWriter.getInstance(document, bos);
writer.setStrictImageSequence(true);
document.open();
Image tiff = Image.getInstance(read);
tiff.scaleToFit(800, 600);
document.add(tiff);
document.close();
outfile.flush();
On Mon, Oct 19, 2009 at 3:39 PM, Paulo Soares <
psoares@...> wrote:
> Not only that, if you use a stream it's read to a byte array. Use a file
> instead.
>
> Paulo
>
> ----- Original Message -----
> From: "Mark Storer" <
MStorer@...>
> To: "Post all your questions about iText here"
> <
itext-questions@...>
> Sent: Monday, October 19, 2009 9:24 PM
> Subject: Re: [iText-questions] Help
>
>
> Give the JVM more memory when you create it:
>
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/java.html>
> This has almost nothing to do with iText, and everything to do with Java.
>
>
> --Mark Storer
> Senior Software Engineer
> Cardiff.com
>
> #include <disclaimer>
> typedef std::Disclaimer<Cardiff> DisCard;
>
> -----Original Message-----
> From: thulasi ram [mailto:
pthulasiram@...]
> Sent: Monday, October 19, 2009 11:15 AM
> To:
itext-questions@...
> Subject: [iText-questions] Help
>
> Hi all,
> I'm using iText Tiff2pdf method for converting Tiff to image pdf. I'm
> getting "Outofmemory" error while converting large size (morethen 5MB)
> images in the line of
> ra = *new* RandomAccessFileOrArray(inStream);.
> Can any one help how to create pdf for large size Tiff images.
>
> Thanks,
> Ram
>
>
>
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
>
http://p.sf.net/sfu/devconference> _______________________________________________
> iText-questions mailing list
>
iText-questions@...
>
https://lists.sourceforge.net/lists/listinfo/itext-questions>
> Buy the iText book:
http://www.1t3xt.com/docs/book.php> Check the site with examples before you ask questions:
>
http://www.1t3xt.info/examples/> You can also search the keywords list:
>
http://1t3xt.info/tutorials/keywords/>
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Message: 5
Date: Wed, 21 Oct 2009 15:24:54 -0400
From: "Brown, Berlin [GCG-PFS]" <
Berlin.Brown@...>
Subject: Re: [iText-questions] Modifying the value of forms in a PDF
document, update!
To: "Brown, Berlin [GCG-PFS]" <
Berlin.Brown@...>,
itext-questions@...
Cc: Berlin Brown <
berlin.brown@...>
Message-ID:
<
C30BF131A023EA4D976727CD4FC563FE063C9F5A@...>
Content-Type: text/plain; charset="us-ascii"
________________________________
From: Brown, Berlin [GCG-PFS]
Sent: Wednesday, October 21, 2009 10:22 AM
To: Brown, Berlin [GCG-PFS]; '
itext-questions@...'
Cc: 'Berlin Brown'
Subject: RE: Modifying the value of forms in a PDF document, update!
I am able to read the PDF document and all of that works fine. I am NOW
having a problem trying to position NEW text near an existing form
field.
ColumnText ct = new ColumnText(canvas);
float[] f = form.getFieldPositions("Text2");
ct.setSimpleColumn(f[1], f[2], f[3], f[4]);
For example, with this code, the setSimpleColumn doesn't seem to be in a
position I want.
It could be that I am using 'ColumnText'
------------
"Your questions up till now didn't get much response because they are
phrased in a rather autistic way (I know because I'm an autist myself).
"
I thought presenting the code, the snippets, "close enough" wording.
I thought that might help.
-----------------
OK, I figured out the problem. This code was causing the problem where
the new text I wanted to display would not appear on the document.
ColumnText ct = new ColumnText(canvas);
float[] f = form.getFieldPositions("Text2");
ct.setSimpleColumn(f[1], f[2], f[3], f[4]);
The result of "getFieldPositions" was off because apparently
the PDF document I read or something made the document rotate
so the absolute x/y positions I wanted to use were off. Sometimes
the text would not display on the document.
I changed the code above to code below:
ColumnText ct = new ColumnText(canvas);
float[] f = form.getFieldPositions("Text2");
ct.setSimpleColumn(f[2], rotHeight-f[1], f[4], rotHeight-f[3]);
And that positions my text exactly where I want it to.
Next Problem: I have another problem, hopefully I will solve
it myself but I will ask anyway in case the problem comes up
for someone else.
Now, using the 'ColumnText' object, how can I get my alignment to
center.
Here are two variantions of my code. Neither work, "align my text"
within the columntext bounding box.
------------
Variation 1:
StyleSheet styles = new StyleSheet();
styles.loadTagStyle("p", "size", size + "px");
styles.loadTagStyle("p", "align", "center");
styles.loadTagStyle("p", "hyphenation", "en_us");
styles.loadTagStyle("p", "width", "100%");
ArrayList<Element> objects = HTMLWorker.parseToList(new StringReader(s),
styles);
ColumnText ct = new ColumnText(canvas);
ct.setSimpleColumn(f[2], rotHeight-f[1], f[4], rotHeight-f[3]);
ct.setAlignment(Element.ALIGN_CENTER);
for (Element element : objects) {
final Chunk cz = new Chunk("___ABC_____", F1);
cz.setFont(F1);
final Phrase jj = new Phrase(cz);
ct.addElement(jj);
}
ct.go();
------------
Variation 2:
StyleSheet styles = new StyleSheet();
styles.loadTagStyle("p", "size", size + "px");
styles.loadTagStyle("p", "align", "center");
styles.loadTagStyle("p", "hyphenation", "en_us");
styles.loadTagStyle("p", "width", "100%");
ArrayList<Element> objects = HTMLWorker.parseToList(new StringReader(s),
styles);
ColumnText ct = new ColumnText(canvas);
ct.setSimpleColumn(f[2], rotHeight-f[1], f[4], rotHeight-f[3]);
ct.setAlignment(Element.ALIGN_CENTER);
for (Element element : objects) {
final Paragraph p1 = new Paragraph( "__Test__", F1);
final PdfPTable table = new PdfPTable(2);
final PdfPCell cell = new PdfPCell(p1);
cell.setBorder(0);
cell.setHorizontalAlignment(Element.ALIGN_LEFT);
table.addCell(cell);
ct.addElement(table);
}
ct.go();
In variation 1 code, the text displays, the text is left aligned. I
want to display the code center aligned
within the bounding box used by setSimplecolumn.
In variation 2 code, the text does not display at all.
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developing skills, take BlackBerry mobile applications to market and stay
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http://p.sf.net/sfu/devconference_______________________________________________
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iText-questions@...
https://lists.sourceforge.net/lists/listinfo/itext-questionsBuy the iText book:
http://www.1t3xt.com/docs/book.phpCheck the site with examples before you ask questions:
http://www.1t3xt.info/examples/You can also search the keywords list:
http://1t3xt.info/tutorials/keywords/
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