Hello! Any decision on this? I'd suggest fallback to search PDF signature at any offset, if libmagic failed, since the standard allows that. Kind regards, XVilka.
On Sun, Jul 3, 2016 at 1:17 PM, Leonardo Taccari <iaml...@gmail.com> wrote: > Hello XVilka! > > XVilka Haos of System writes: >> Hello! >> If you heard about PoC||GTFO e-zine, you know that they're playing >> with produced PDF format a lot, keeping it still a valid. Since >> zathura based on poppler, I've checked also those files with evince. >> Seems evince parse them properly. >> >> Take e.g. this file https://www.alchemistowl.org/pocorgtfo/pocorgtfo11.pdf >> Zathura show nothing, evince show all pages properly. >> >> You also can check on other files from this page too: >> https://www.alchemistowl.org/pocorgtfo/ > The problem doesn't seem the PDF plugin used (I can reproduce the same > with zathura-pdf-mupdf) but the fact that zathura uses libmagic(3) (or > similar methods) to invoke the proper plugin, e.g.: > > $ zathura pocorgtfo11.pdf > error: Unknown file type: 'application/octet-stream' > > ...indeed: > > $ file --mime-type pocorgtfo11.pdf > pocorgtfo11.pdf: application/octet-stream > > Giving a look to the first 112 bytes of it we can see: > > $ hexdump -C -n 112 pocorgtfo11.pdf > 00000000 72 65 71 75 69 72 65 20 27 6a 73 6f 6e 27 0a 72 |require > 'json'.r| > 00000010 65 71 75 69 72 65 20 27 73 6f 63 6b 65 74 27 0a |equire > 'socket'.| > 00000020 72 65 71 75 69 72 65 20 27 75 72 69 27 0a 3d 62 |require > 'uri'.=b| > 00000030 65 67 69 6e 0a 25 50 44 46 2d 31 2e 35 0a 25 d0 > |egin.%PDF-1.5.%.| > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^ > ...PDF starts here!.............. > 00000040 d4 c5 d8 0a 39 39 39 39 20 30 20 6f 62 6a 0a 3c |....9999 0 > obj.<| > 00000050 3c 0a 2f 4c 65 6e 67 74 68 20 31 30 39 34 34 0a |<./Length > 10944.| > 00000060 3e 3e 0a 73 74 72 65 61 6d 0a 3d 65 6e 64 0a 70 > |>>.stream.=end.p| > 00000070 > > Getting rid of the first 53 bytes: > > $ tail -c $(expr $(wc -c < pocorgtfo11.pdf) - 53) pocorgtfo11.pdf > > pocorgtfo11-pdf.pdf > $ file --mime-type pocorgtfo11-pdf.pdf > pocorgtfo11-pdf.pdf: application/pdf > > ...we can correctly view it: > > $ zathura pocorgtfo11-pdf.pdf > > I'm not sure if maybe an option to force a particular plugin (and > avoid using libmagic(3) and any similar methods) can be useful or > not. In these cases it is! > _______________________________________________ > zathura mailing list > zathura@lists.pwmt.org > https://lists.pwmt.org/mailman/listinfo/zathura _______________________________________________ zathura mailing list zathura@lists.pwmt.org https://lists.pwmt.org/mailman/listinfo/zathura
