Raw printing over IPP

[Paul Thompson]

I have a new Laserjet 1022 that is attached to a LINUX (SuSE 8.1) server and
I'm trying to print to it using IPP. The setup works perfectly if I use a
Windows Laserjet 6L printer driver.

I have recently tried to use the supplied Laserjet 1022 printer driver. It
sends raw data over the network which cups must recognise as such and send
unmodified to the printer.

I have uncommented the octet-stream lines in mime.convs and mime.types per
manual:

ie. /etc/cups/mime.types:
#application/octet-stream


/etc/cups/mime.convs:
#application/octet-stream       application/vnd.cups-raw        0      -

The problem I am now getting is that CUPS is failing to recognise the '-' as a
simple pass-thru filter and trying to run a filter program. I get a 'Unable to
convert file 0 to printable format for job ...' error.

If I change the '-' in mime.convs to another filter I can see that program
being executed in the error_log (it of course fails as the format doesn't
match) so it is correctly assessing the input coming over the internet as
octet-stream and trying to convert it into raw. Basically, it seems that CUPS
is failing to recognise the '-' as the special pass-thru filter.

If I intercept the spooled file on the LINUX server I can successful force it
to print with a 'lp -o raw <file>' command, so the Windows computer is sending
the LINUX computer the right data. However if I try just 'lp <file>' I get the
same message as above.

As I understand CUPS, it should work. I know that the are other methods of
printing (eg. sending postscript to CUPS and letting CUPS convert it to
suitable PCL, using a more simple PCL driver such as the LJ 6L one, or using
Samba) but the above should work and enable every Windows client to use the
full features of the printer driver.

I'm running CUPS v1.1.15

If anyone has any ideas, then thanks

Paul Thompson