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https://issues.apache.org/jira/browse/PDFBOX-4297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17257709#comment-17257709
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Tilman Hausherr edited comment on PDFBOX-4297 at 1/3/21, 10:55 AM:
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I was able to check your file with streams in the same amount of time. Btw the
proposed method doesn't work because it returns a closed input stream. There is
more work to do, the method you mentioned, and then the check for
"adbe.x509.rsa_sha1" (update: turns out that this one isn't part of our
repository, because it contains code from another project).
was (Author: tilman):
I was able to check your file with streams in the same amount of time. Btw the
proposed method doesn't work because it returns a closed input stream. There is
more work to do, the method you mentioned, and then the check for
"adbe.x509.rsa_sha1".
> Allow to space efficiently analyse large PDFs
> ---------------------------------------------
>
> Key: PDFBOX-4297
> URL: https://issues.apache.org/jira/browse/PDFBOX-4297
> Project: PDFBox
> Issue Type: Improvement
> Components: Parsing
> Reporter: Ralf Hauser
> Priority: Major
> Attachments: programWinter2015_20210103_091853-sig_LTV.pdf
>
>
> Assume you get a 300+MB large pdf and need to know
> 1) the file names of embedded files if any
> 2) whether it is encrypted (symmetric or asymmetric)
> 3) certification level (and whether it is signed)
> This should not use more than 5 MB (extra) memory
>
> P.S.: seems to an exampe of https://pdfbox.apache.org/ideas.html "Handle
> large PDF files"
>
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