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CUPS Software Version Description

CUPS-SVD-1.1
Easy Software Products
Copyright 1997-2005, All Rights Reserved

Table of Contents

• 1.1 Identification
• 1.2 System Overview
• 1.3 Document Overview

• 2.1 CUPS Documentation
• 2.2 Other Documents

• 3.1 Filters
  • 3.1.1 imagetoraster, imagetops
  • 3.1.2 pdftops
  • 3.1.3 pstoraster
  • 3.1.4 rastertoepson
• 3.2 User-Defined Printers and Options
• 3.3 Daemons
  • 3.3.1 cups-lpd
  • 3.3.2 cups-polld
• 3.4 Commands
  • 3.4.1 lpoptions
  • 3.4.2 lpmove
  • 3.4.3 lpinfo
• 3.5 IPP Implementation

• 4.1 Directory Structure
• 4.2 IPP Implementation

• A.1 Terms
• A.2 Acronyms

1 Scope

1.1 Identification

1.2 System Overview

CUPS provides a portable printing layer for UNIX®-based operating systems. It has been developed by Easy Software Products to promote a standard printing solution for all UNIX vendors and users. CUPS provides the System V and Berkeley command-line interfaces.

CUPS uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon ("LPD") Server Message Block ("SMB"), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network printer browsing and PostScript Printer Description ("PPD") based printing options to support real-world printing under UNIX.

CUPS includes an image file RIP that supports printing of image files to non-PostScript printers. A customized version of GNU Ghostscript 7.05 for CUPS called ESP Ghostscript is available separately to support printing of PostScript files within the CUPS driver framework. Sample drivers for Dymo, EPSON, HP, and OKIDATA printers are included that use these filters.

Drivers for thousands of printers are provided with our ESP Print Pro software, available at:

    http://www.easysw.com/printpro/

CUPS is licensed under the GNU General Public License and GNU Library General Public License. Please contact Easy Software Products for commercial support and "binary distribution" rights.

1.3 Document Overview

This software version description document is organized into the following sections:

• 1 - Scope
• 2 - References
• 3 - Additions
• 4 - Changes
• A - Glossary

2 References

2.1 CUPS Documentation

The following CUPS documentation is referenced by this document:

• CUPS-CMP-1.1: CUPS Configuration Management Plan
• CUPS-IDD-1.1: CUPS System Interface Design Description
• CUPS-IPP-1.1: CUPS Implementation of IPP
• CUPS-SAM-1.1.x: CUPS Software Administrators Manual
• CUPS-SDD-1.1: CUPS Software Design Description
• CUPS-SPM-1.1.x: CUPS Software Programming Manual
• CUPS-SSR-1.1: CUPS Software Security Report
• CUPS-STP-1.1: CUPS Software Test Plan
• CUPS-SUM-1.1.x: CUPS Software Users Manual
• CUPS-SVD-1.1: CUPS Software Version Description

2.2 Other Documents

The following non-CUPS documents are referenced by this document:

• Adobe PostScript Printer Description File Format Specification, Version 4.3.
• Adobe PostScript Language Reference, Third Edition.
• IPP/1.1: Implementers Guide
• RFC 1179, Line Printer Daemon Protocol
• RFC 2396, Uniform Resource Identifiers (URI): Generic Syntax
• RFC 2567, Design Goals for an Internet Printing Protocol
• RFC 2568, Rationale for the Structure of the Model and Protocol for the Internet Printing Protocol
• RFC 2569, Mapping between LPD and IPP Protocols
• RFC 2616, Hypertext Transfer Protocol -- HTTP/1.1
• RFC 2617, HTTP Authentication: Basic and Digest Access Authentication
• RFC 2910, IPP/1.1: Encoding and Transport
• RFC 2911, IPP/1.1: Model and Semantics
• RFC 3380, IPP: Job and Printer Set Operations

3 Additions

CUPS 1.1 includes many new features from the 1.0.x releases.

3.1 Filters

3.1.1 imagetoraster, imagetops

The image file filters have been upgraded to support conversion of Microsoft Bitmap ("BMP") and Alias PIX files.

3.1.2 pdftops

A new pdftops filter has been developed that is based on the excellent Xpdf 0.90 software from Derek B. Noonburg. The new filter is faster, smaller, and considerably more reliable than the Ghostscript-based filter in CUPS 1.0.

3.1.3 pstoraster

The pstoraster filter has been integrated with GNU GhostScript 5.50. The new RIP supports most Level 3 PostScript language features.

3.1.4 rastertoepson

The new rastertoepson filter supports EPSON printers using the ESC/P or ESC/P2 command sets. PPDs are supplied for 9-pin, 24-pin, Stylus Color, and Stylus Photo printers.

3.2 User-Defined Printers and Options

The new lpoptions command allows users to configure default document options and create additional "instances" of existing printers, each with unique options.

The lp, lpr, and lpstat commands have been upgraded to use this option and printer instance information automatically.

3.3 Daemons

CUPS 1.1 includes two new daemons that provide enhanced network printing support.

3.3.1 cups-lpd

The cups-lpd daemon provides support for clients using the Line Printer Daemon protocol.

3.3.2 cups-polld

The cups-polld daemon provides remote polling services for the scheduler.

3.4 Commands

CUPS 1.1 includes several new printing commands.

3.4.1 lpoptions

The lpoptions command provides user-defined printers and options.

3.4.2 lpmove

The lpmove command moves a print job to a new destination.

3.4.3 lpinfo

The lpinfo command lists the available PPD files or devices.

3.5 IPP Implementation

CUPS 1.1 adds support for the set-job-attributes extension operation as well as two new CUPS-specific extension operations to determine which devices and printer drivers are available on the system.

Further information on the CUPS implementation of IPP can be found in CUPS-IPP-1.1.

4 Changes

CUPS 1.1 includes many changes from the 1.0.x releases.

4.1 Directory Structure

The directory structure in CUPS 1.1 has been modified to conform to the Filesystem Hierarchy Standard, 2.0. The following table describes the new file locations.

4.2 IPP Implementation

CUPS 1.1 is based on version 1.1 of the Internet Printing Protocol.

The new scheduler supports the create-job and send-document operations. In addition, the job-sheets , job-sheets-default, and job-sheets-supported attributes are now supported for banner pages.

The CUPS-get-printers and CUPS-get-classes operations have been upgraded to support limited filtering based upon the printer-type, printer-location, printer-info, and printer-make-and-model attributes.

The CUPS-add-printer operation now supports the ppd-name attribute to specify a locally-available PPD file rather than sending the PPD file from the client with the request.

Further information on the CUPS implementation of IPP can be found in CUPS-IPP-1.1.

A Glossary

A.1 Terms

C

A computer language.

parallel

Sending or receiving data more than 1 bit at a time.

pipe

A one-way communications channel between two programs.

serial

Sending or receiving data 1 bit at a time.

socket

A two-way network communications channel.

A.2 Acronyms

ASCII

American Standard Code for Information Interchange

CUPS

Common UNIX Printing System

ESC/P

EPSON Standard Code for Printers

FTP

File Transfer Protocol

HP-GL

Hewlett-Packard Graphics Language

HP-PCL

Hewlett-Packard Page Control Language

HP-PJL

Hewlett-Packard Printer Job Language

IETF

Internet Engineering Task Force

IPP

Internet Printing Protocol

ISO

International Standards Organization

LPD

Line Printer Daemon

MIME

Multimedia Internet Mail Exchange

PPD

PostScript Printer Description

SMB

Server Message Block

TFTP

Trivial File Transfer Protocol