Davide Silvestri created PDFBOX-3256:
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Summary: Trailer Validation error
Key: PDFBOX-3256
URL: https://issues.apache.org/jira/browse/PDFBOX-3256
Project: PDFBox
Issue Type: Bug
Components: Preflight
Affects Versions: 2.0.0
Reporter: Davide Silvestri
According to PDF specifications "File identifiers are defined by the optional
ID entry in a PDF file’s trailer dictionary (see Section 3.4.4, “File Trailer”;
see also implementation note 162 in Appendix H). The value of this entry is an
array of two byte strings. The first byte string is a permanent identifier
based on the contents of the file at the time it was originally created and
does not change when the file is incrementally updated. The second byte string
is a changing identifier based on the file’s contents at the time it was last
updated."
We are having a problem validating a PDF/A1-b when preflight checks first and
last trailer. TrailerValidationProcess.java compares IDs in the compareIds
function checking that both values remain the same in the first and last
trailer, not only the first byte. It checks both the first byte AND the second
byte into the cycle (line 206). Being the second byte a changing item when the
file is updated (eg. with a digital signature), we have this error in
validation "1.4.6.: Trailer Syntax error, ID is different in the first and the
last trailer" even if the first item remains the same and so the PDF/A1-b
compliance should be verified.
Please can you help me with this issue?
Thank you very much.
Davide
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