Mailinglist Archive: opensuse-bugs (9642 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=339736

           Summary: cups: PostScript "wrapping" causes additional unwanted
                    output
           Product: openSUSE 10.3
           Version: Final
          Platform: All
        OS/Version: openSUSE 10.3
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Printing
        AssignedTo: jsmeix@xxxxxxxxxx
        ReportedBy: Ulrich.Windl@xxxxxxxxxxxxxxxxxxxx
         QAContact: jsmeix@xxxxxxxxxx
          Found By: ---


When printing a PostScript file to a PostScript printer using CUPS, it seems
that CUPS modifies the PostScript file before it's sent to the printer. In some
cases this may produce unwanted output.
Specifically CUPS seems to add this at the end of the PostScript file:
%%Trailer
%%Pages: 0
%%BoundingBox: ...
%%EOF

For special PostScript files that use "readstring" to process part of the input
file via PostScript, the additional lines will also be processed (and possibly
output).

A sketch of such code would look like this.
%------ snip -------
/process {
  /buff 1 string def
  {
    currentfile buff readstring
    not {
      pop exit
    } if
    dup stringwidth pop /tw exch def
    show
    tw 0 rmoveto
  } loop
  showpage
} def

100 400 moveto
/Helvetica findfont 10 scalefont setfont
process
Sample line of text to be printed
%------ snip -------

In Ghostscript the sample line would be printed correctly, but with CUPS the
extra trailer will be output as well.


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