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https://issues.apache.org/jira/browse/PDFBOX-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Silvestri updated PDFBOX-3256:
-------------------------------------
Description:
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, but it checks both the first byte AND the second byte of the trailer
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
was:
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
> Trailer Validation error PDF/A1-b
> ----------------------------------
>
> 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, but it checks both the first byte AND the second byte of the trailer
> 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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