gzip decompression not always working

[Opher Shachar]

Hello all,
If I issue the command:

   lp MyPostscriptFile.gz

It works as expected and I see in error_log these lines:

   D [28/Sep/2008:15:36:06 +0300] cupsdReadClient: 17 POST /printers/hptasht HTTP/1.1
   D [28/Sep/2008:15:36:06 +0300] cupsdAuthorize: No authentication data provided.
   D [28/Sep/2008:15:36:06 +0300] Print-Job ipp://localhost/printers/hptasht
   D [28/Sep/2008:15:36:06 +0300] print_job: auto-typing file...
   D [28/Sep/2008:15:36:06 +0300] print_job: request file type is application/postscript.
[snip]
   I [28/Sep/2008:15:36:06 +0300] Job 661 queued on "hptasht" by "user".
[snip]
   I [28/Sep/2008:15:36:06 +0300] Started filter /usr/lib/cups/filter/gziptoany (PID 13378) for job 661.
   I [28/Sep/2008:15:36:06 +0300] Started filter /usr/lib/cups/filter/pstops (PID 13379) for job 661.
   I [28/Sep/2008:15:36:06 +0300] Started backend /usr/lib/cups/backend/socket (PID 13380) for job 661.

But if I issue the command:

   lp MyPostscriptFile.gz -odocument-format=text/plain

to get the postscript source to print I get gibberish and the following in error_log:

   D [28/Sep/2008:15:37:29 +0300] cupsdReadClient: 17 POST /printers/hptasht HTTP/1.1
   D [28/Sep/2008:15:37:29 +0300] cupsdAuthorize: No authentication data provided.
   D [28/Sep/2008:15:37:29 +0300] Print-Job ipp://localhost/printers/hptasht
   D [28/Sep/2008:15:37:29 +0300] print_job: request file type is text/plain.
[snip]
   I [28/Sep/2008:15:37:29 +0300] Job 662 queued on "hptasht" by "user".
[snip]
   I [28/Sep/2008:15:37:29 +0300] Started filter /usr/lib/cups/filter/texttops (PID 13389) for job 662.
   I [28/Sep/2008:15:37:29 +0300] Started filter /usr/lib/cups/filter/pstops (PID 13390) for job 662.
   I [28/Sep/2008:15:37:29 +0300] Started backend /usr/lib/cups/backend/socket (PID 13391) for job 662.

Here the gziptoany filter was not prepended to the filter chain.

One way around this is to decompress the file before printing, ie:

   gunzip MyPostscriptFile.gz | lp -odocument-format=text/plain

but this is not so elegant...

Could this be a feature request?
Is it by design? (or perhaps a bug?)

Thanks,
Opher Shachar.