Lionel Fradin created PDFBOX-5623:
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Summary: Signature Image not Rendered starting with PDFBox 2.0.23
+ patch provided
Key: PDFBOX-5623
URL: https://issues.apache.org/jira/browse/PDFBOX-5623
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.28, 2.0.27, 2.0.26, 2.0.25, 2.0.24, 2.0.23
Environment: Java 8, Windows 10 and Ubuntu 22
Reporter: Lionel Fradin
Attachments:
Fixing_the_problem_when_the_COSArray_is_not_sorted_in_increasing_order_.patch,
PDFBOX-issue-rendering-signature.pdf, pdfbox22-page9-br.jpg,
pdfbox23-page9-br.jpg
We have an online service where our customers post their PDF files so that we
can render them.
One of our customer noticed recently that one of its signed document did not
show the image associated with the signature. They gave me the right to share
this document and you will find it attached
([^PDFBOX-issue-rendering-signature.pdf]).
The problem is in the last page, page 9. The issue can easily be reproduced
using pdfbox-app-2.0*.jar PDFToImage.
Result with pdfbox 2.0.22 is:
!pdfbox22-page9-br.jpg!
Result with pdfbox 2.0.23 or later is:
!pdfbox23-page9-br.jpg!
The regression was introduced with commit (seen in git)
f34a33824c4363b9b683245cb582328dc92b79ca, dated 2021-03-02 07:12:11+0000. The
associated ticket was PDFBOX-5112.
The issue is in PDFXrefStreamParser's ObjectNumbers constructor, as it assumes
that the COSInteger objects in the COSArray are necessarily sorted. In the case
of the attached pdf, they are not, and this causes the parser to abort browsing
the array too soon.
I have a patch for that on branch 2.0:
[^Fixing_the_problem_when_the_COSArray_is_not_sorted_in_increasing_order_.patch]
With this patch the image is created successfully. However, there are warning
that appear, that did not exist in version 2.0.22:
{noformat}
Jun 16, 2023 5:18:29 PM org.apache.pdfbox.pdfparser.COSParser findObjectKey
WARNING: found wrong object number. expected [6789] found [6791]
Jun 16, 2023 5:18:29 PM org.apache.pdfbox.pdfparser.COSParser findObjectKey
WARNING: found wrong object number. expected [6790] found [5327]
Jun 16, 2023 5:18:29 PM org.apache.pdfbox.pdfparser.COSParser findObjectKey
WARNING: found wrong object number. expected [6791] found [6485]
Jun 16, 2023 5:18:29 PM org.apache.pdfbox.pdfparser.COSParser findObjectKey
WARNING: found wrong object number. expected [6485] found [6789]
{noformat}
There may be additional fixes to be made in order to fully support this PDF.
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