[pdftex] Description of the /AF key

[Ross Moore]

If I recall correctly, /AF was introduced with PDF/A-3, which has its own ISO document, some years after ISO 32000.

It is in PDF 2.0.
There is now free documentation for this via the PDF Association.

Good luck.

   Ross

Sent from my iPhone

> On 23 Aug 2023, at 10:49 pm, Reinhard Kotucha <reinhard.kotucha at gmx.de> wrote:
> 
> Hello everybody,
> I'm currently working on a texlua script supposed to extract embedded
> files from a PDF file created by pdftex and the LaTeX package embedfile.
> 
> There are two ways to locate attachments:
> 
> | 51 0 obj
> | <<
> | /Type /Catalog
> | /Pages 33 0 R
> | /Outlines 48 0 R
> | /Names 50 0 R
> | /PageMode/UseOutlines/PageLayout/SinglePage/AF 35 0 R
> | /OpenAction 25 0 R
> | >>
> | endobj
> 
> The most convenient way is go to obj 35 as mentioned in the line
> 
> | /PageMode/UseOutlines/PageLayout/SinglePage/AF 35 0 R
> 
> The /AF key points to an array with pointers to the embedded files:
> 
> | 35 0 obj
> | [ 12 0 R 2 0 R 4 0 R 6 0 R 8 0 R 10 0 R]
> | endobj
> 
> Another, much less convenient way, is to is to follow
> 
> | /Names 50 0 R
> 
> mentioned in the catalogue:
> 
> | 50 0 obj
> | <<
> | /Dests 49 0 R
> | /EmbeddedFiles 34 0 R
> | >>
> 
> and obj 34 contains
> 
> | 34 0 obj
> | <</Names[(../attachments)12 0 R(./embfiles/01-lpegsplit\040H\303\240\040N\341\273\231i.lua)2 0 R(embfiles/02-luafiles.zip)4 0 R(embfiles/03-luasplit.lua)6 0 R(embfiles/04-luatable.lua)8 0 R(embfiles/subdir/05-MLKspeech.pdf)10 0 R]>>
> | endobj
> 
> As yo can see, this is more difficult to process, hence I prefer the
> /AF way, but I can't find any description of the /AF key in the PDF
> specification.
> 
> Is this pdftex specific or did I miss something?
> 
> Regards,
>  Reinhard
> 
> --
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