[pdftex] Description of the /AF key

[Reinhard Kotucha]

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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Reinhard Kotucha                            Phone: +49-511-3373112
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