Yes - without the trailer you can't find anything else in the PDF.
I find it VERY hard to believe that you saved that file from Adobe Acrobat 9.x
- it would have a trailer. Please provide the file that you opened originally
in Acrobat 9 and then any information about the saving process. Did you just do
File->Save? Save As? Other? Is this 9.0, 9.1, 9.1.1 or 9.1.2? On what OS
platform?
Leonard
On 6/11/09 2:19 PM, "Paul Gatewood" <[email protected]> wrote:
Is the trailer element always required in a PDF document?
I have recently encountered documents without the trailer (IOException
"trailer not found" when instantiating PdfReader).
In the past, the "save as" feature of Acrobat produced a PDF with the
trailer.
Now I am using Acrobat 9 and the "save as" does not add the trailer (at
least to the files I am encountering at the moment).
Looking at the PDF specification at
http://www.adobe.com/devnet/acrobat/pdfs/PDF32000_2008.pdf (I hope this
is the right location), I see at the end of section 7.5.8.1 the following:
"The value following the startxref keyword shall be the offset of
the cross-reference stream rather than the xrefkeyword. For files that
use cross-reference streams entirely (that is, files that are not
hybrid-reference files; see 7.5.8.4, "Compatibility with Applications
That Do Not Support Compressed Reference Streams"), the keywords xref
and trailer shall no longer be used. Therefore, with the exception of
the startxref address %%EOFsegment and comments, a file may be entirely
a sequence of objects."
I am in no way a PDF expert, so I don't know whether this is apropos to
this situation or not, but I am trying to do homework before asking for
help :-)
I can not supply the PDF I received, due to its confidential content.
I have, however, edited it with Acrobat 9 to remove all the content I
could see, then saved it ("save as") to a file called
test-saved-from-acrobat-9.pdf, which I am attaching.
So, does anyone know more about this, i.e. whether in this situation it
really is legitimate that the trailer is omitted?
And if so, is there a way to deal with this in iText? I am currently
using iText 2.1.4.
--
Leonard Rosenthol
PDF Standards Architect
Adobe Systems Incorporated
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