control characters                   stream'
   o     fff  Print Postscript    document-format  'application/PostScri
              output file                          pt'
                                  copies           see note

   Note: In practice, the 'f' LPD function is often overloaded. It is
   often used with any format of document data including PostScript and
   PCL data.

   Note: In practice, the 'l' LPD function is often used as a rough
   equivalent to the 'f' function.

   Note: When RFC 1179 was written, no implementation supported the 'o'
   function; instead 'f' was used for PostScript. Windows NT now sends '
   o' function for a PostScript file.

   Note: the value 'fff' of the 'f', 'l' and 'o' functions is the name
   of the data file as transferred, e.g. "dfA123woden".

   If the mapper receives any other lower case letter, the mapper SHALL
   reject the job because the document contains a format that the mapper
   does not support.

   The mapper determines the number of copies by counting the number of
   occurrences of each 'fff' file with one of the lower-case functions
   above. For example, if 'f dfA123woden' occurs 4 times, then copies
   has a value of 4. Although the LPD protocol allows the value of
   copies to be different for each document, the commands and the
   receiving print systems don't support this.













 
RFC 2569         Mapping between LPD and IPP Protocols        April 1999


4.4 Recommended Document Functions

   The mapper SHOULD receive one set of the recommended document
   functions with each document, and SHOULD include the converted
   information as an operation or job template attribute with each IPP
   document. The functions SHOULD be received in the order 'U' and 'N',
   but they MAY arrive in any order.

   LPD function                       IPP
   name  value   description          name              value

   U     fff                          ignored
   N     n       Name of source file  document-name     n

   Note: the value 'fff' of the 'U' function is the name of the data
   file as transferred, e.g. "dfA123woden".

5. Mapping from IPP operations to LPD commands

   If the IPP-to-LPD mapper receives an IPP operation, the following
   table summarizes the LPD command that it uses. Each section below
   gives the detail. Each of the following sub-sections appear as sub-
   sections of section 3 in the document "Internet Printing
   Protocol/1.0: Model and Semantics" [RFC2566].

   IPP operation                     LPD command

   Print-Job or Print-URI or         receive-a-printer-job
   Create-Job/Send-Document/Send-URI and then print-any-waiting-jobs
   Validate-Job                      implemented by the mapper
   Cancel-Job                        remove-jobs
   Get-Printer-Attributes, Get-Job-  send queue state (short or long)
   Attributes or Get-Jobs

5.1 Print-Job

   The mapper SHALL send the following commands in the order listed
   below:

      - receive-a-printer-job command
      - both receive-control-file sub-command and receive-data-file
        sub-command (unspecified order, see Note below)
      - print-any-waiting-jobs command, except that if the mapper is
        sending a sequence of receive a printer-job commands, it MAY
        omit sending print-any-waiting-jobs after any receive a
        printer-job command that is neither the first nor last command
        in this sequence





 
RFC 2569         Mapping between LPD and IPP Protocols        April 1999