Handling Object Stream / Cross Ref stream in PDF 1.4

[quriocity@adobeforums.com]

Hi,

My PDF Application handles only PDF spec 1.4 and when my Application process a PDF file generated with Acrobat ~ PDF 1.6, I see some
Cross Reference Stream object Xrefstm.

I did go through PDF Spec 1.6, but I am not able to code the same in my
application.

When a PDF Acrobat 8 file is processed by my Application, an output file
generated, but unable to open it.

It shows the follwing err - expected dict object and I found that object having
Catalog Type, does not have a Pages Object entry.

Is this (Missing Dictionary object - Pages )due to my code not handling xrefstm?
---------------------------------------------------------------------------------------
Aandi Inston - 9:15am Aug 3, 08 PST (#1 of 2)

Sounds likely to be the cause. You should detect and reject this case.

Aandi Inston

----------------------------------------------------------------------------------------------------------------
Hi Andi,

In 1.6 generated Acrobat file - my input file, the after reading /Prev
entry, traverses to starting of the file to beginning of the cross
reference section or table (as per the PDF 1.6 Spec this is how /Prev
works)

In my application, it is going / reading the object second object (it
also contains XRef, not handled in my code), the first object after
the header information is not at all read.

The object at the beginning contains type -- ObjStm ( this is not
handled in my code),

My Application reads the input file (PDF 1.4) from first object - here
I dont have any /Prev entry.

Not sure how to handle the XrefStm,- can you please guide me how to
reject this case (XrefStm)

Any guidance..

[Jon Bessant]

i would listen to Aandi and others in the original PDF specification
forum ...

Jon


[email]quriocity@adobeforums.com[/email] wrote:

> Hi,
>
> My PDF Application handles only PDF spec 1.4 and when my Application process a PDF file generated with Acrobat ~ PDF 1.6, I see some
> Cross Reference Stream object Xrefstm.
>
> I did go through PDF Spec 1.6, but I am not able to code the same in my
> application.
>
> When a PDF Acrobat 8 file is processed by my Application, an output file
> generated, but unable to open it.
>
> It shows the follwing err - expected dict object and I found that object having
> Catalog Type, does not have a Pages Object entry.
>
> Is this (Missing Dictionary object - Pages )due to my code not handling xrefstm?
> ---------------------------------------------------------------------------------------
> Aandi Inston - 9:15am Aug 3, 08 PST (#1 of 2)
>
> Sounds likely to be the cause. You should detect and reject this case.
>
> Aandi Inston
>
> ----------------------------------------------------------------------------------------------------------------
> Hi Andi,
>
> In 1.6 generated Acrobat file - my input file, the after reading /Prev
> entry, traverses to starting of the file to beginning of the cross
> reference section or table (as per the PDF 1.6 Spec this is how /Prev
> works)
>
> In my application, it is going / reading the object second object (it
> also contains XRef, not handled in my code), the first object after
> the header information is not at all read.
>
> The object at the beginning contains type -- ObjStm ( this is not
> handled in my code),
>
> My Application reads the input file (PDF 1.4) from first object - here
> I dont have any /Prev entry.
>
> Not sure how to handle the XrefStm,- can you please guide me how to
> reject this case (XrefStm)
>
> Any guidance..