pdf-association/arlington-pdf-model

Extend Arlington extension to document OpenOffice and LibreOffice custom trailer keys

petervwyatt opened this issue · 3 comments

petervwyatt commented

In file trailer and XRefStream:

  • /AdditionalStreams [/application#2Fvnd#2Eoasis#2Eopendocument#2Etext 6 0 R] (ODT document) - an array of pairs of (MIME as a name + indirect references to streams)

  • /DocChecksum /DocChecksum /C2ABA76E903B138C5EC5DE44D0AE2A77 (MD5 as a name)

See https://git.libreoffice.org/core/+/refs/heads/master/vcl/source/gdi/pdfwriter_impl.cxx

petervwyatt commented

According to https://bugs.documentfoundation.org/show_bug.cgi?id=66580, /DocChecksum and /AdditionalStreams were added to OpenOffice on 2007-03-26.

In the LibreOffice git repository this is commit d217c079d7b3ca7b5039428594e7cdfdf9a0c4a9

From quick code skim, looks like this might occur in any PDF from PDF 1.2 (historically)

crlf0710 commented

Are these correct uses of first-class names?

petervwyatt commented

Nope. But its what they've been doin' since 2007-ish so there are plenty in the wild!
I have a few issues open with them ATM to fix conformance to PDF/A and PDF/UA subsets...