[NTG-context] attachment attaches twice - more research

Hans Hagen pragma at wxs.nl
Mon Feb 21 01:11:00 CET 2011


On 20-2-2011 11:21, Michail Vidiassov wrote:
> Dear Developers,
>
> On Sun, 20 Feb 2011, Michail Vidiassov wrote:
>
>> to be precise, the attachment is attached once
>> but is listed twice by Adobe Reader.
>
> PDF spec states
> ----------
> An embedded file stream shall be included in a PDF document in one of
> the following ways:
> • Any file specification dictionary in the document may have an EF entry
> that specifies an embedded file stream. The stream data shall still be
> associated with a location in the file system. In particular, this
> method shall be used for file attachment annotations (see 12.5.6.15,
> "File Attachment Annotations"), which associate the embedded file with a
> location on a page in the document.
> • Embedded file streams may be associated with the document as a whole
> through the EmbeddedFiles entry (PDF 1.4) in the PDF document’s name
> dictionary (see 7.7.4, "Name Dictionary"). The associated name tree
> shall map name strings to file specifications that refer to embedded
> file streams through their EF entries.
> ----------
>
> while code in lpdf-wid.lua sends everything to EmbeddedFiles - including
> files associated "with a location on a page in the document" as in the
> examples in the originator's post.

i'll patch lpdf-wid but somehow I get the impression that it's more a 
viewer issue (the list shown seems to be a merge of filename as well as 
symbolic names while a clever list builder should look at the referred 
objects) ... but maybe no one else usesvdifferent symbolic names (we had 
similar issues with fields in the past and even now advanced field 
support is somewhat bugged one or the other way, depending on the viewer 
version, esp chained ones)

Hans

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