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1995-02-27
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Disk Imploder Intuition Interface V1.0 by Colin Bell.
-------------------------------------------------------------------
DESCRIPTION
DImp-Win allows you to archive disk cylinders from a window
using Disk-Imploder V2.27 by A.J.Brouwer.
When run, DImp-Win will present you with a window displaying
all the options available for each mode. Click on the Mode cycle
gadget to change between Read, Write & Info modes. As you do this
the non-applicable gadgets for each mode will be ghosted. After you
have made your choices, click on start. DImp-Win will invoke DImp
and tell it what to do.
DImp-Win requires: AmigaOS version 2.04 +
reqtools.library V37 + (in your libs directory)
DImp V2.27 + (somewhere in your path)
DIMP
DImp is one of the most efficient disk archivers available
for the Amiga. It offers 7 different levels of compression,
the ability to create self-extracting archives, MULTIPLE CYLINDER
RANGES, ability to work with any floppy compatible device (such as
RAD: & FMS disks) and it can also add a textfile to the archive that
will be displayed during extraction.
Apart from that, it has the FASTEST decompression speed of any disk
archiver available! To demonstrate this I did this test. I DMS'd &
DIMP'd a NonDos Game disk in maximum mode of both archivers.
Compression was done on a 68030 and floppy disk
DMS took 2mins 50secs to create a file of 597510 bytes
Dimp took 2mins 25secs to create a file of 629925 bytes
Decompression was done on a 68000 and an FMS disk
DMS took 5mins 28secs to unpack the disk
DIMP took 0mins 30secs to unpack the disk
That is a Humungous saving when you add all the figures up. The 29k
filesize difference is only 20secs or so at 9600bps. So get out
your calculator & work out which archiver you should be using.
DImp-Win carries absolutely no warranties, either expressed or implied.
DImp-Win may not be included with any commercial product nor may it be
sold for profit either seperately or as part of a compilation without
my permission.
CONTACT Fidonet: Colin Bell 3:712/512
Snail: PO BOX 1058
Bondi Junction
NSW 2022 Australia
DImp is Freeware by Albert-Jan Brouwer
DImp-Win is Freely Distributable but © Copyright 1992 by Colin Bell
ReqTools & reqtools.library are © Copyright 1991/92 Nico Francois
=======ORIGINAL DIMP DOCUMENTATION====================================
Disk Imploder V2.27 by A.J.Brouwer. FreeWare
---------------------------------------------
NAME
DImp - Archives cylinders.
SYNOPSIS
DImp READ <SourceDrive> Ca[-Cb,Cc,..] <TargetFile> [-M?|-NB|-NC|-X] [+Readme]
The collection of cylinders to be read must be specified by ranges, Ca-Cb,
and/or single cylinders, separated by commas.
-M? or MODE? = Compression mode, ? = 0-7, default = 5
-NB or NOBITMAP = Ignore bitmap (normally unused blocks are cleared)
-NC or NOCOMP = Do not compress cylinders
-X or EXE = Create self-extracting overlayed executable
+"Name of Readme file to be displayed during WRITE"
DImp WRITE <DImpFile> <TargetDrive>
DImp INFO <DImpFile>
DImp ABOUT
DImp will use ".dmp" or ".dex" filename extensions when trying to
create or recognize DImp data files.
DESCRIPTION
DImp allows you to compress a subselection of cylinders from
any floppy compatible device into a file. DImp is fast and
sports a good compression ratio. Notably, DImp allows you to
create a self extracting file with an appended readme text,
thus providing you with a completely self-contained method of
distributing a disk's contents in a file.
There are four operation mode keywords; "READ" specifies
that cylinders must be read, "WRITE" indicates that you wish to
write cylinders encoded in a dimped file, "INFO" displays
information about the contents of a file containing dimped
cylinders, and "ABOUT" should be obvious.
The cylinders are individually compressed, checksummed and
stored, thus, in case of a transmission error, valid cylinders
can be undimped, and the originator can then select, dimp and
retransmit the faulty cylinders.
The cylinders to be READ can be selected by entering cylinder
numbers separated by commas, or a dash if you wish to specify
a range of cylinders.
When reading or writing, DImp can handle any device that
supports the normal floppy 2 heads 11 sectors etc. layout,
thus it is usable with f.e a RAD: or an FMS disk. You can omit
the colon normally following these device names.
Additional options include compression mode selection override.
Given the fact that the tracks are compressed individually, the
default mode 5 has a pretty optimal compression ratio, though
the ratio isn't as good as it might have been if cylinder data
had been treated as a continuous stream. This is a design choice
intended to allow the aforementioned flexible handling of
individual cylinders.
If there's sufficient free memory, DImp will allocate buffers
for a turbo compression algorithm. Also, reducing the crunch
mode will speed things up, dramatically so if you don't have
sufficient free memory for DImp to run in turbo mode. Lowering
the crunch modes results in less efficient compression though.
Next, there are a couple of option switches. NOBITMAP
prevents DImp from discarding data that, according to the disk's
bitmap, isn't used by the filing system. This option is rarely
needed. If you suspect a disk to contain a program that uses a
low level routine to read its information from that disk, this
option might be required to prevent loss of relevant data.
NOCOMP disables compression. EXE causes DImp to generate self
extracting dimp files. These can be executed, and will write
their contents to a disk selected by the user. Executable DImp
files (.dex filename extension) can be treated as normal DImp
files (.dmp filename extension) in that you can use DImp to
WRITE these, or get INFO on them.
Lastly, you may specify a filename containing text to be
displayed during the writing or self-extraction of the dimp file
you're creating. This allows you to include a fairly extensive
comment on the contents of the disk. This readme filename must
follow a "+" commandline indicator.
EXAMPLES
DImp READ rad 0-79 Work:Cylinders EXE +ram:blahblah
TECHNOCRAP
The self-extracting executable files generated by DImp are
overlayed. This allows for the cylinder data to be spooled
during the self-extraction process, resulting in much more
modest memory requirements than the size of the executable
would lead one to suspect.
Thanks to resource tracking, transparent error management,
modular algorithm linking, and sitting on the program for
several years before releasing it, DImp should be very robust
and return sensible error messages.
DImp is pure and can be made resident.
AUTHOR
Albert-Jan Brouwer
UUCP hp4nl.nluug.nl!cbmnlux!ecl001!ajbrouw
UUCP cbmvax.commodore.com!cbmehq!cbmnlux!ecl001!ajbrouw
FIDO: 2:281/614 (up for freq sometime fall '91)