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1994-12-13
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PPData version 1.0
Yet Another PowerPacker Utility
-------------------------------
No, not by Nico, but made possible by his powerpacker.library. This
program is basically an intuition front-end for that library, and allows
you to crunch and decrunch DATA files. "But I've already got
PowerPacker!", I hear you cry. Well, if you only have the shareware
version <= 2.3b, you'll know that crunching can be a time-consuming
business. Later (commercial) versions use speedup-buffers to
dramatically decrease the crunching time. Newer versions of
powerpacker.library provide the facility to use these faster methods of
crunching, and that's where PPData comes in.
The program is only for use with Kickstart 2.0 upwards. This is because
it takes advantage of the many breaks programmers were given with the
new OS. Yet another reason to upgrade. You should install
powerpacker.library version 1.4 or higher (version 1.4 is included with
this distribution). To do this, double-click the 'Install' icon.
PPData can be started from Workbench or CLI and is self-detatching if
run from CLI (ie. no need to run it). No CLI interface is provided, so
however you start it, you get a small window with menus attached.
These should for the most part be self-explanatory if you've used
PowerPacker before, so here's a quick rundown:
Project Menu
------------
Load Opens up a file requester (asl from Commodore) asking
for you to select a file. Once selected, PPData
determines whether the file is already crunched. If it is,
it looks at the Control settings (see below) to decide
what to do (decrunch, recrunch with current settings or
cancel). If the file is not crunched, it is loaded and
crunched. The window displays various statistics about
the crunch process, including a progress indicator.
Save Once you have successfully crunched (or decrunched) a
file, choose this option to save. Again, a file
requester pops up prompting for the name. This name is
initially set to the name of the file you loaded, plus
or minus a '.pp' extension, depending on whether this is
required (see Prefs menu below).
Batch Batch mode. Not nearly as comprehensive as PowerPacker's,
but should be adequate for most purposes. First of all,
it asks for the save path for processed files. Then a
file requester asks you to select files to process. This
is done using a Multi-Request asl requester. In this you
select multiple files as in Workbench way, ie. shift-clicking.
Unfortunately, all files must be in same directory (this
is a fault of asl.library, in my opinion).
Once you've selected all your files, click the OK
gadget. PPData will then load each file, process it (in
same manner as described in Load item above) and save
work to the save path, again adding or removing '.pp'
depending on preferences.
Delete This lets you delete a file (file-requester pops up).
About Displays version and author.
Quit Quits PPData. If current buffer is unsaved, you are warned.
Prefs Menu
----------
Color Color to use when decrunching files
Efficiency How efficiently files should be compressed. This
has a bearing on the speed of crunching.
Speedup How big a buffer to use. The bigger, the faster,
but large buffer mode uses an extra 200K or so.
Suffix Whether to add '.pp' suffix to crunched files.
PowerPacker utilities such as PPMore automatically look
for this suffix. Eg. if you crunched this doc and saved
it as PPData.doc.pp, then typed PPMore PPData.doc,
PPMore would look for '.pp' file if it couldn't find
named file.
Overwrite If set, PPData will query before overwriting a file.
Save Prefs Saves current preferences to the file S:PPData.config.
Control Menu
------------
This controls how PPData reacts when it loads an already crunched file.
'Always decrunch' and 'Always recrunch' do what they say. 'Ignore
crunched' simply passes over crunched files. 'Query decrunch' pops up a
requester offering the choice of the former three options at the time of
loading. Query mode is most useful in interactive sessions; however, when
using batch mode, it's handy to set one of the other controls to prevent
work being halted with a requester.
That's the menus; now a few general points. I have tried to make PPData
user-friendly in that it won't let you do silly things, at least without
checking first. It's also preferences-friendly, adjusting window size
and menus to handle currently set fonts, although proportional fonts
might cause problems. But since it's probably a bad idea to use a
proportional font as screen font (since so many programs would break) I
won't be doing anything about it for now.
As far as I am aware, PPData frees all of its resources on exiting, and
is bug-free. However, I'd be glad if you contact me if you find out otherwise
Credits
-------
Well, mostly to Nico Francois for his excellent PowerPacker utilities
and library - PPData's raison d'etre.
Credit must also go to Commodore, for making the programmer's life
considerably easier with AmigaDOS 2.0. It's a pity they make such a mess
of their marketing - just as well the product sells itself.
Finally, thanks to Steve Koren for SKsh, and Mike Meyer et al. for mg3
(still the best PD text editor).
Finally
-------
This product is completely public domain (which isn't to say
contributions wouldn't be gratefully appreciated by a poor student
hampered by an authoritarian government which thinks students are a
burden to Society). Distributions should at least include unmodified
binary and this document, and preferably the source too.
All suggestions for improvements/modifications, and especially bug
reports are welcome (encouraged even). I'd appreciate it if you didn't
distribute modified versions of PPData without checking with me first.
Things I plan:
* Make it an 'AppWindow' so you can just drop icons into the
window to have them processed.
* Enhancement of Batch mode.
* Add support for encrypted files (does anyone use these?).
I can be contacted by postal mail at:
Martin W. Scott,
23 Drum Brae North,
Edinburgh,
EH4 8AT,
(dis)United Kingdom.
or by email (preferred) - my address is mws@castle.ed.ac.uk
Enjoy!
- Martin.