[Python-apps-team] Bug#515184: pkpgcounter failes to read PJL-wrapped postscript

[Joachim Breitner]

Hi,

Am Sonntag, den 15.02.2009, 18:37 +0100 schrieb alet at librelogiciel.com:
> On Sun, Feb 15, 2009 at 03:05:04PM +0100, Joachim Breitner wrote:
> >
> > I’m not sure if I can follow this argument. The attached print file was
> > not valid postscript, but rather postscript wrapped in an PJL print job,
> > if I understand it correctly. Therefore, it can not be a bug in
> > ghostscript.
> 
> You may be correct.
> 
> However, simply take pykota and pkpgcounter out of the equation, and
> use instead the cups-pdf backend for CUPS, written by Volker C. Behr.
> 
> I bet you'll have the very same problem (untested, but from reading its
> source code it launches gs and doesn't strip out any PJL).

Hmm. I’d assume that for cups-pdf, you would not use the .ppd file for a
real printer model (a kyocera printer in my case), so cups would not add
the PJL header, and send the plain PS. At least I assume so, as
otherwise cups-pdf would not work :-)

> This means this bug should be reported to any similar software,
> duplicating efforts needlessly.
> 
> Really it depends if we consider gs is emulating a printer or is only a
> PS interpreter. In the first case it should recognize PJL's Universal
> Exit Language (<ESC>%-12345X) because the document, as seen from a
> printer supporting PJL and PostScript, is perfectly correct. In the
> latter case it doesn't need to.
>
> Not sure what GhostScript developers think about this problem.
>
> I'm not 100% against implementing a workaround for this problem, but
> I'd prefer that ghostscript developers handle this situation, 
> otherwise other developers would have to create similar workarounds
> for their own software.

I’d expect them so see the latter case (PS interpreter), but from a user
point of view, it doesn’t matter much :-)


Thanks,
Joachim
-- 
Joachim "nomeata" Breitner
Debian Developer
  nomeata at debian.org | ICQ# 74513189 | GPG-Keyid: 4743206C
  JID: nomeata at joachim-breitner.de | http://people.debian.org/~nomeata
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