TweetFollow Us on Twitter

LaserWriter PAPA Resource

Volume Number: 13 (1997)
Issue Number: 12
Column Tag: develop

LaserWriter 8.5.1: The Extended 'PAPA' Resource

by Richard Blanchard, RBI Software Systems Inc., Ingrid Kelly, Apple Computer Inc. and Chorng-Shyan Lin, RBI Software Systems Inc.

Overview

Starting with LaserWriter 8.5.1, in order to support different types of desktop printers, the 'PAPA' -8192 resource has been extended from 103 to 1024 bytes long. This TechNote discusses the additional bytes and in what way the LaserWriter 8.5.1 driver uses them.

Note: If your code relies on the size of the 'PAPA' resource, it may crash with LaserWriter 8.5.1 unless you update it to support the extended 'PAPA' resource.

The 'PAPA' Resource

The new 'PAPA' looks just like an old style 'PAPA' at the front of the resource; that is, the 'PAPA' resource begins with three packed Pascal strings representing the printer name, the network type (usually LaserWriter), and the printer's zone. After these strings comes the 4-byte network address.

The new extended 'PAPA' then adds desktop printer (DTP) data beginning at the 104th byte in the resource. The data from bytes 104 to 1024 (1-based indices) is a series of tagged blocks where each block contains a 4-byte tag, followed by a 2-byte length value, and then the actual data. A series of these tagged blocks can reside in bytes 104 to 1024.

Tag Requirements

There are a few requirements for the tagged blocks that go into the extended 'PAPA.' They are:

  • The only required block in an extended 'PAPA' is the 'TAGS' tag which gives the number of valid tag blocks in the extended resource. The 'TAGS' block must be the first tag in the extended record and serves as a validity check.
  • When the extended portion of the 'PAPA' contains multiple tag blocks, each block is required to start on a word (16-bit) boundary. Thus, if a tag block has an odd length, there should be a byte of padding before the start of the next tag block.
  • In order to limit the number of clients that need to understand the extended 'PAPA' format, and to make it easier to change the format in the future, the SettingsLib provides routines for creating and accessing the extended 'PAPA.' Relying on the extended 'PAPA' format rather than using SettingsLib is a bad idea. For more information on SettingsLib, please see Apple's TechNote web site.

Tag Types

Tag: 'TAGS'

Value Size: sizeof(UInt16), 2 bytes

The value of the 'TAGS' block provides the number of valid tag blocks in the extended print record including itself. The 'TAGS' block must be the first tag in the extended print record; a valid extended print record must therefore begin with the byte sequence: 0x5441 0x4753 0x0002.

Tag: 'TYPE'

Value Size: sizeof(OSType), 4 bytes

This tag is optional as its contents are redundant given the PAPA zone name string. If this tag does exists, then its value must match, not literally but in meaning, the DTP type implied by the zone string. Here are the zone string mappings to 'TYPE' values:

Zone Name             'Type'        Definition
String              tag value

=Hld                  'Hold'      Creates and holds spool files. The 
                                  spool files are never processed and the	
                                  DTP is not connected to a real printer.
=Fil*                 '=Fil'      Creates PostScript or EPS files, is 
                                  not connected to a real printer.
=Cst*                 '=Cst'      Creates a PostScript file and then launches
                                  an application to post-process the file.
=LPR*                 '=LPR'      Sends a PostScript job using the    
                                  LPR protocol.
=Ird*                 '=Ird'      Sends a PostScript job over an irda,
                                  infrared, channel.
Valid Zone string      'PAP'      Uses the AppleTalk PAP protocol to print 
                                  the job.

In the preceding mapping, the '*' in the zone name string is a wildcard which can be replaced by zero or more characters of any value. The DTP Utility uses this part of the zone name string to differentiate between DTP printers of the same type with the same name located in different folders.

Beside the tag values 'Hold', '=Fil', '=Cst', '=LPR', '=Ird', and 'PAP ,' other tag values may be added in the future for new DTP types.

Tag: 'TCP '

Value Size: variable size string

If the DTP printer type requires a TCP/IP network address, it is placed in the extended PAPA using the 'TCP ' tag. The value of the tag block is the network address of the printer either as a fully qualified network address, such as colorlaser.apple.com, or in dot format, such as 204.188.109.151.

This tag is required for DTP printers of type '=LPR.' The length of the string is determined from the block length.

Tag: 'Q'

Value Size: variable size string.

If a DTP can use a print queue name, as can LPR DTPs, then the print queue name is placed in a tag value block of type 'Q .' The length of the string is determined from the block length.

Summary of DTP type, zone names, and tags.

DTP Type           PAPA Zone String        Extended Data Tags
PAP                Actual Zone Name        'TYPE' is 'PAP '
Hold                  "     "    "         'TYPE' is 'Hold'
Save to File            =Fil*              'TYPE' is '=Fil'
Custom                  =Cst*              'TYPE' is '=Cst'
LPR	                    =LPR*              'TYPE'is'=LPR'
                                           'TCP'is printer's net address
                                           'Q'is optional and is the name of 
                                           the print spooler.
InfraRed                =Ird               'TYPE'is'=Ird'

Summary

This TechNote has documented the changes in the 'PAPA' resource in LaserWriter 8.5.1. Please beware if your application depends on the size of the 'PAPA' as it may no longer work with LaserWriter 8.5.1.

Further Reference

Acknowledgements

Thanks to Leticia Alarc'n, John Blanchard and Paul Danbold


Richard Blanchard has been programming LaserWriter 8 since its inception and one day hopes to finish it. Working at RBI Software Systems, Inc. Richard, from day to day, codes in C, C++, and Java and tries to draw a bead on the future of network printing.

Ingrid Kelly works in Apple’s Developer Technical Support group. She was sad to see the Blue Angels air show season end this year, but never fear, she is already counting down the days until the start of next year’s air show season. 99...98...97...

Chorng-Shyan Lin is a Macintosh developer at RBI Software Systems, Inc. He can be reached via email at lin@rbi.com.

 
AAPL
$100.96
Apple Inc.
-0.83
MSFT
$47.52
Microsoft Corpora
+0.84
GOOG
$596.08
Google Inc.
+6.81

MacTech Search:
Community Search:

Software Updates via MacUpdate

Audio Hijack Pro 2.11.3 - Record and enh...
Audio Hijack Pro drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio with Audio Hijack... Read more
Airfoil 4.8.9 - Send audio from any app...
Airfoil allows you to send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! It's your audio - everywhere. With Airfoil you can take audio from any... Read more
WhatRoute 1.13.0 - Geographically trace...
WhatRoute is designed to find the names of all the routers an IP packet passes through on its way from your Mac to a destination host. It also measures the round-trip time from your Mac to the... Read more
Chromium 37.0.2062.122 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. FreeSMUG-Free OpenSource Mac User Group build is... Read more
Attachment Tamer 3.1.14b9 - Take control...
Attachment Tamer gives you control over attachment handling in Apple Mail. It fixes the most annoying Apple Mail flaws, ensures compatibility with other email software, and allows you to set up how... Read more
Duplicate Annihilator 5.0 - Find and del...
Duplicate Annihilator takes on the time-consuming task of comparing the images in your iPhoto library using effective algorithms to make sure that no duplicate escapes. Duplicate Annihilator detects... Read more
jAlbum Pro 12.2 - Organize your digital...
jAlbum Pro has all the features you love in jAlbum, but comes with a commercial license. With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code!... Read more
jAlbum 12.2 - Create custom photo galler...
With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code! Beginner-friendly, with pro results Simply drag and drop photos into groups, choose a design... Read more
Quicken 2015 2.0.4 - Complete personal f...
Quicken 2015 helps you manage all your personal finances in one place, so you can see where you're spending and where you can save. Quicken automatically categorizes your financial transactions,... Read more
iMazing 1.0 - Complete iOS device manage...
iMazing (formerly DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and... Read more

Latest Forum Discussions

See All

View Source – HTML, JavaScript and CSS...
View Source – HTML, JavaScript and CSS 1.0 Device: iOS Universal Category: Utilities Price: $.99, Version: 1.0 (iTunes) Description: View Source is an app plus an iOS 8 Safari extension that makes it easy to do one key web developer... | Read more »
Avenged Sevenfold’s Hail To The King: De...
Avenged Sevenfold’s Hail To The King: Deathbat is Coming to iOS on October 16th Posted by Jessica Fisher on September 19th, 2014 [ permalink ] Just in time for Halloween, on October 16 Avenged Sevenfold will be launching | Read more »
Talisman Has Gone Universal – Can Now be...
Talisman Has Gone Universal – Can Now be Played on the iPhone Posted by Jessica Fisher on September 19th, 2014 [ permalink ] | Read more »
Tap Army Review
Tap Army Review By Jennifer Allen on September 19th, 2014 Our Rating: :: SHOOT EM ALLUniversal App - Designed for iPhone and iPad Mindless but fun, Tap Army is a lane-based shooter that should help you relieve some stress.   | Read more »
Monsters! Volcanoes! Loot! Epic Island f...
Monsters! Volcanoes! Loot! | Read more »
Plunder Pirates: Tips, Tricks, Strategie...
Ahoy There, Seadogs: Interested in knowing our thoughts on all this plundering and pirating? Check out our Plunder Pirates Review! Have you just downloaded the rather enjoyable pirate-em-up Plunder Pirates and are in need of some assistance? Never... | Read more »
Goat Simulator Review
Goat Simulator Review By Lee Hamlet on September 19th, 2014 Our Rating: :: THE GRUFFEST OF BILLY GOATSUniversal App - Designed for iPhone and iPad Unleash chaos as a grumpy goat in this humorous but short-lived casual game.   | Read more »
A New and Improved Wunderlist is Here fo...
A New and Improved Wunderlist is Here for iOS 8 Posted by Jessica Fisher on September 19th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Evernote Update for iOS 8 Adds Web Clipp...
Evernote Update for iOS 8 Adds Web Clipping, Quick Notes, and More Posted by Ellis Spice on September 19th, 2014 [ permalink ] | Read more »
Apple Names Ultimate Productivity Bundl...
Apple Names Ultimate Productivity Bundle by Readdle as the Essential Bundle on the App Store Posted by Jessica Fisher on September 19th, 2014 [ permalink | Read more »

Price Scanner via MacPrices.net

iFixIt Tears Down iPhone 6; Awards Respectabl...
iFixit notes that even the smaller 4.7″ iPhone 6 is a giant among iPhones; so big that Apple couldn’t fit it into the familiar iPhone form factor. In a welcome reversal of a recent trend to more or... Read more
Phone 6 Guide – Tips Book For Both iPhone 6...
iOS Guides has announced its latest eBook: iPhone 6 Guide. Brought to you by the expert team at iOS Guides, and written by best-selling technology author Tom Rudderham, iPhone 6 Guide is packed with... Read more
How to Upgrade iPhone iPad to iOS 8 without D...
PhoneClean, a iPhone cleaner utility offered by iMobie Inc., reveals a solution for upgrading iPhone and iPad to iOS 8 without deleting photos, apps, the new U2 album or anything. Thanks to more than... Read more
Inpaint 6 – Photo Retouching Tool Gets Faster...
TeoreX has announced Inpaint 6, a simple retouching tool for end users that helps remove scratches, watermarks, and timestamps as well as more complex objects like strangers, unwanted elements and... Read more
Worldwide PC Monitor Market Sees Growth in To...
Worldwide PC monitor shipments totaled 32.5 million units in the second quarter of 2014 (2Q14), a year-over-year decline of -2.9%, according to the International Data Corporation (IDC) Worldwide... Read more
Updated Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
Mac Pros available for up to $260 off MSRP
Adorama has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and Adorama charges sales tax in NY & NJ only: - 4-core Mac Pro: $2839.99, $160 off MSRP - 6-core Mac Pro: $3739.99, $260... Read more
13-inch 2.6GHz/256GB Retina MacBook Pros avai...
B&H Photo has the 13″ 2.6GHz/256GB Retina MacBook Pro on sale for $1379 including free shipping plus NY sales tax only. Their price is $120 off MSRP. Read more
Previous-generation 15-inch 2.0GHz Retina Mac...
B&H Photo has leftover previous-generation 15″ 2.0GHz Retina MacBook Pros now available for $1599 including free shipping plus NY sales tax only. Their price is $400 off original MSRP. B&H... Read more
21″ 2.7GHz iMac available for $1179, save $12...
Adorama has 21″ 2.7GHz Hawell iMacs on sale for $1179.99 including free shipping. Their price is $120 off MSRP. NY and NJ sales tax only. Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** At the Apple Store, you connect business professionals and entrepreneurs with the tools they need in order to put Apple solutions to work in their Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** The Apple Store is a retail environment like no other - uniquely focused on delivering amazing customer experiences. As an Expert, you introduce people Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** As businesses discover the power of Apple computers and mobile devices, it's your job - as a Solutions Engineer - to show them how to introduce these Read more
Position Opening at *Apple* - Apple (United...
…Summary** As a Specialist, you help create the energy and excitement around Apple products, providing the right solutions and getting products into customers' hands. You Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.