Re: Fix for 687117, Error: /typecheck in --get-- when attempt to view pdf document V1.4

I don't understand this patch.
First, the change looks algorithmically equivalent. I'm unclear why does it
fix something.
Second, pdf_sec.ps defines :

% Process the encryption information in the Trailer.
/pdf_process_Encrypt {
  Trailer /Encrypt oget
  /Filter oget /Standard eq not {
  ......
}

Substituting it to the patch, got :

   Trailer /Encrypt knownoget {
     pop
    {
       Trailer /Encrypt oget
       /Filter oget /Standard eq not {
  ......
    } exec
} if

And again it executes "null /Filter oget" ---> Error: /typecheck in --get--.

Igor.



----- Original Message ----- 
From: "Alex Cherepanov" <[email protected]>
To: "gs-code-review" <[email protected]>
Sent: Friday, October 31, 2003 7:10 AM
Subject: [gs-code-review] Fix for 687117, Error: /typecheck in --get-- when
attempt to view pdf document V1.4


> Following the PDF spec ignore "/Encrypt null" entry in the trailer.
>
>


----------------------------------------------------------------------------
----


> Index: gs/lib/pdf_main.ps
> ===================================================================
> RCS file: /cvs/ghostscript/gs/lib/pdf_main.ps,v
> retrieving revision 1.80
> diff -b -u -r1.80 pdf_main.ps
> --- gs/lib/pdf_main.ps 26 Oct 2003 00:52:28 -0000 1.80
> +++ gs/lib/pdf_main.ps 31 Oct 2003 03:51:03 -0000
> @@ -364,7 +364,8 @@
>         } if
>       } loop
>     } ifelse
> -   Trailer /Encrypt known {
> +   Trailer /Encrypt knownoget {
> +     pop
>       pdf_process_Encrypt % signal error
>     } if
>     currentdict end
>


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