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https://issues.apache.org/jira/browse/PDFBOX-5927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17907155#comment-17907155
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Tilman Hausherr edited comment on PDFBOX-5927 at 12/19/24 6:46 PM:
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I think I understand most of it now. "Sì" is an indirect object in the source
file:
!screenshot-3.png!
In {{COSWriterObjectStream.writeObject()}} there is this:
{code:java}
if (!topLevel && this.compressionPool.contains(base))
{
COSObjectKey key = this.compressionPool.getKey(base);
if (key == null)
{
throw new IOException(
"Error: Adding unknown object reference to object stream:" +
object);
}
writeObjectReference(output, key);
return;
}
{code}
Because the key is also an object, the method will be called and will produce
an indirect object.
Two possible solutions:
1) add {{&& !(base instanceof COSName)}} to the "if"
2) in {{writeCOSDictionary}} write the key with the "topLevel" parameter true
(but I'm not sure about what the intention of the parameter is)
was (Author: tilman):
I think I understand most of it now. "Sì" is an indirect object in the source
file:
!screenshot-3.png!
In {{COSWriterObjectStream.writeObject()}} there is this:
{code:java}
if (!topLevel && this.compressionPool.contains(base))
{
COSObjectKey key = this.compressionPool.getKey(base);
if (key == null)
{
throw new IOException(
"Error: Adding unknown object reference to object stream:" +
object);
}
writeObjectReference(output, key);
return;
}
{code}
Because the key is also an object, the method will be called and will produce
an indirect object.
Two possible solutions:
1) add {{ && !(base instanceof COSName)}} to the "if"
2) in {{writeCOSDictionary}} write the key with the "topLevel" parameter true
(but I'm not sure about what the intention of the parameter is)
> Saved file has "Invalid dictionary" when reloading
> --------------------------------------------------
>
> Key: PDFBOX-5927
> URL: https://issues.apache.org/jira/browse/PDFBOX-5927
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 3.0.3 PDFBox, 4.0.0
> Reporter: Tilman Hausherr
> Priority: Major
> Attachments: ObjStm.txt, SO79293670-saved.pdf, SO79293670.pdf,
> screenshot-1.png, screenshot-2.png, screenshot-3.png
>
>
> {code:java}
> try (PDDocument doc = Loader.loadPDF(new File("SO79293670.pdf")))
> {
> PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
> PDCheckBox cb = (PDCheckBox) acroForm.getField("chkPrivacy1");
> cb.check();
> doc.save(new File("SO79293670-saved.pdf")); //,
> CompressParameters.NO_COMPRESSION);
> }
> try (PDDocument doc = Loader.loadPDF(new File("SO79293670-saved.pdf")))
> {
> PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
> PDCheckBox cb = (PDCheckBox) acroForm.getField("chkPrivacy1");
> System.out.println(cb.isChecked()); // should be true
> }
> {code}
> The output:
> {noformat}
> 19.12.2024 16:48:15 WARN pdfparser.BaseParser.parseCOSDictionary:308 -
> Invalid dictionary, found: '3' but expected: '/' at offset 12814
> 19.12.2024 16:48:15 WARN pdfparser.BaseParser.parseCOSDictionary:308 -
> Invalid dictionary, found: '3' but expected: '/' at offset 12851
> false
> {noformat}
> The offsets are in the object stream.
> When opening the modified file with Adobe Reader, I get
> !screenshot-1.png!
> And after clicking CTRL-RETURN I get
> !screenshot-2.png!
> The problem does not happen when saving with compression disabled.
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