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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 12/20/24 4:18 AM:
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I think I understand most of it now. "Sì" is an indirect object in the source
file as the value of /DV, this is unusual, but allowed:
!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, but in practice
when true no indirect writing occurs)
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")))
> {
> 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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