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============================= Zoom 5.4 ===============================
======================================================================
A floppy disk tracking and archiving utility, written by Olaf `Olsen'
Barthel, © Copyright 1990-92 by Olaf Barthel, all rights reserved.
Zoom! is a Gift-Ware product.
Lh data compression/decompression code © Copyright 1990-91 by
Holger P. Krekel & Olaf Barthel, bootblock virus recognition code ©
Copyright 1992 by Gregor Hörmann, run-length-compression code ©
Copyright 1992 by Henning Leise, arp.library © Copyright 1987-89 by
Arp Programmers.
No guarantee of any kind is made that the program(s) described in
this document are 100% reliable. You use this material on your own
risk.
======================= READ THIS OR MISS OUT ========================
======================================================================
On startup `Zoom' will examine its internal hunk structures: if
anything is not in its correct place both programs will put up alerts.
To discover what was wrong enter `Zoom SELFTEST'.
Enter `CRC Zoom' to calculate the external checksum and compare it
with the sample given in this document. Any difference indicates
possible virus infection! If you don't trust the sample checksum
listed in this document, send me a letter or electronic mail (adresses
listed below) and ask for the `factory checksum'.
THIS AND THE FOLLOWING ZOOM! RELEASES MAY ONLY BE DISTRIBUTED IN
THE SELF-EXTRACTING ARCHIVE FORM!!!
============================== Contents ==============================
======================================================================
This package consists of five files. The CRC checksums were obtained
using the `CRC' utility (also included in this package). Provided
that all checksums match the following samples (and this document has
not been modified) no file is virus-infected.
Release Date: 28-Feb-92, 10:49
Zoom (CRC = $5C645E7E, Size = 82180 Bytes)
Zoom.info
CRC (CRC = $4F5177B9, Size = 4104 Bytes)
arp.library (CRC = $805F8D84, Size = 17100 Bytes)
Zoom.doc (Size = 33209 Bytes)
The `CRC' utility will also calculate and print the so-called
`WRAP' checksum. For all programs in this distribution (including
`Zoom' and `CRC') this checksum MUST be zero (if nonzero, the
approriate file has been modified).
All programs in this distribution are PURE, I suggest setting the
`p' bit if not already done.
========================= About this release =========================
======================================================================
I must admit that the previous `Zoom' releases would not work quite as
correctly as advertised. Revisions previous to v4.2 would
occasionally produce corrupt disks when decompressing archive files.
In revision 4.2 the byte run precompressor was removed, curing the
`corrupt' disk problem. As an unpleasant side effect compression
performance and speed dropped. The reason for the trouble caused by
the precompressor was never quite clear and the original Author (K.
Wiesel) is certain that it works in its unmodified form. In the
course of events I was told to remove the remaining original
decompression code and so I did.
A couple of weeks ago I was encouraged to rewrite `Zoom' and to
replace the previous byte run precompressor with a different
precompressor. In the course of events `Zoom' and the corresponding
file format were greatly enhanced. Among other features the program
now sports support for sector header labels and uses 32 bit checksums.
The user interface was rewritten to support the Kickstart 2.x new
look. The `ZoomCheck' program was removed from the distribution, its
functions have been integrated into `Zoom'.
Due to changes in the output file format files created with the
current `Zoom' release cannot be decompressed using previous `Zoom'
releases. `Zoom' v5.4 will still read and decompress old style disk
archive files provided that they do NOT CONTAIN any run-length encoded
data since the original decompression routine had to be removed on
request by the original author.
============================== Purpose ===============================
======================================================================
Disk archiving utilities are becoming increasingly attractive. Almost
all other disk compression tools lack a friendly user interface, take
ages to finish their work or simply produce very long output files.
`Zoom' uses highly-efficient data compression routines derived from
LhArc (adaptive Huffman squeezing) which have been converted into
MC680x0 code (we call it `Lh'). Data compression/decompression is
always much faster than displayed by programs such as Warp, LhWarp,
LhArc and older versions of LZ (that is, before Jon Forbes tweaked the
compression algorithm).
To reduce the chance of compressing a virus-infected disk, `Zoom'
will examine the bootblock and display it if it is of nonstandard
type. The following 274 different bootblock viruses and custom
bootblocks are recognized:
16BitCrew PvL 5.4
2001 PvL 6.1
AEK PvL 6.4
AIDS PvL 6.5
AlienNewBeat SupplyTeam
AmigaFreak TelStar
Ass VirusHunter
Australian Parasite ACID 1.0
BS1 ACID 3.0
BlackFlash Alcatraz MegaDemo 3
BlowJob Antitrax 2010
Butonic AtomicSoft
ByteVoyager 1 Avirex
ByteVoyager 2 Betrayal 1.0
ByteBandit 1 BootBug 0.1
ByteBandit 2 BB Generation
ByteBandit 3 BootGirl
ByteWarrior BootIntro 1.2
CCCP BootIntro NextGen
ClaasAbraham BootOut 5.5
CList BootTune
CodersNightmare BudBrain
DiskDoktors CCS 2.0
DAG CCS 3.0
Destructor DevWare
DigitalEmotions ClearMem
DiskGuard DOC 1989
DiskHerpes Dragons MegaDemo 1
FAST 1 Dugger
FAST 2 Int. Soccer
FICA BootCopy
Forpib License to kill
Gadaffi Mad Monks
Graffiti MemControler 1.2
Gremlin MemAllocator 1.3
GXTeam NoFastMem
HCS NOMAD 1.0
Hilly Outlaw Checker 1.42
ICE PAL-Boot
Incognito Paradroid 90
IngerIQ Phenomena Enigma
JITR Phenomena MegaDemo 1
Joshua 1 PinBall Wizard
Joshua 2 PowerSlaves 1
Julie PvL Sound
Kauki Quartex DrivesOff
Kefrens Razor 1911 Observe
Lamer 1 RSI MegaDemo 1
Lamer 2 RSI MegaDemo 2
Lamer 3 Scoopex BootIntro
Lamer 4 Scoopex MentalHangover
Lamer 5 Scoopex PAL-Boot 2.0
Lamer 6 S&D BootCheck 1.0
LameStyleUK S&D DriveControl 1.0
LSD Sinister Syndicate
MAD 2 SlipStream 4.0
MegaMaster SlipStream 6.1
Mexx Squash 4.3
MicroSystems SysNot
MorbidAngel TAL BootLeg 2.1
NorthStar 1 TheSect MegaConcert
NorthStar 2 TLC DemoSample
Obelisk Boot Writer
ObeliskFormat Venom BootLoader 1.00a
Opapa Virus Destructor 1
Paradox 1 Virus Destructor 2
Paradox 2 VirusKiller prof. 2.0
Paratax 1 Vision MegaDemo 4
Paratax 2 Vortex 42 1.3
PentagonCircle 1 XCopy prof
PentagonCircle 2 ZeroVirus AutoAddRAM
PentagonCircle 3 ZeroVirus BigScreen
PowerBomb ZeroVirus Message
Rene ZeroVirus NoFastMem
Revenge Amigo Copy
RevengeBootload Anarchy 1.1
SaddamHussein Anarchy 2
SCA Archaos VirusSlayer 3.13
ScarFace Archaos VirusSlayer 3.12
Sendarian Action Replay Pro
SuperBoy Aspect 1.0
SwitchOff Amaze Protector
Target BeerMon Installed
Termigator Cytax Powerboot 1.2
TimeBomb Copper
TGTS FastMem Allocator
Traveller Hallon 1.4
Turk Hypnosis
UltraFox Hyperboot 2.82
Vermin Interferion Pro
VirusSlayer Interferion 1
VKill Interferion 2
WarHawk Inner City 3.4
AIDS (HIV) Kefrens Menu
AmigaMaster LSD 1.1
BigBoss LSD 1.0
BladeRunners LSD 2.0
BLF Mirage Noboot
CLI-Manager Memory Allocator 1.2
Clonk Memory Controler 1.3
DAT MegaBoot 1.3
Deniz Unal NoFastMem
Divina Exterminator 1 NTSC Warning
Extreme Omniboot 5.1
Fast Eddie Omniboot 3.2
Frity Option Boot
Future Disaster Peter Stuer 4.0
Glasnost Peter Stuer 5.0
Gyros Punishers Pro
Hauke Pleasure Boot 1.3+
Hireling Pseudo Ops 2.1
Hoden 33.17 Pe Protector
LoverBoy Quartex 1.0
MAD 3 Quazar/Dawn
Nasty-Nasty! Random Access 2.1
No Banit Anymore! Rebels
Paramount Scorpion Developments 1.0
Ripper Scorpion Developments 1.1
Riska Stoneboot 1.06
Suntronic Scoopex 1.3
Twinz Santa Claus Santurary
ULDV 8 Sabaudian 1.0
Virus 4.2 Scoopex 1.0
Warsaw Avenger SlipStream 2.1
Xerox SlipStream 3.0
ZAccess 1.0 SlipStream 6.0
ZAccess 2.0 SlipStream 5.0
Blizzard SlipStream 7.0
BWFastLoad SuperDuper
M&U 5.5 TriStar 1.1
M&U 6.1 TetraCopy
StarFire TSB Protector
PvL 3.0 TSB Virusfree
PvL 4.0 UltPack BootLoad
PvL 5.0 VCC BootMem
PvL 5.1 VCS 3.2
PvL 5.3 Zap'Em 1.0
`Zoom' will put up an alert if it finds one of these bootblocks on
a disk to be compressed and will ask you whether you wish to have the
suspicious bootblock data replaced in the compressed disk archive or
not. If you choose to replace it, `Zoom' will use a standard
Kickstart 2.x bootblock in place of the original data. While this
bootblock is different from the Kickstart 1.3 bootblock, it is still
compatible with older Kickstart revisions.
============================ Installation ============================
======================================================================
Copy `arp.library' to your LIBS: directory, `Zoom' requires it. ENV:
(default AmigaDOS environment storage directory) should be assigned to
somewhere, but needn't.
======================== `Zoom' Shell usage ==========================
======================================================================
The following command line template is displayed if you type `Zoom ?':
From,To,Check/K,T=Text/K,S=Start/K,E=End/K,C=Crypt/K,D=ClearData/S,
B=ClearBlocks/S,V=Verify/S,L=SecLabels/S,Q=Quiet/S,N=NoPrompt/S,
Selftest/S
From .......... Name of the file to be read and written back to disk
or the name of the filing device to read the data from
to be compressed:
Examples: `Zoom from df0: to ram:doodle'
`Zoom from ram:doodle to df0:'
If possible, `Zoom' will try to determine if source
and destination overlap. You will be notified if you
are about to decompress a file residing on the
destination disk or to create a file on the source
disk to be compressed.
To ............ Name of the device to store the decompressed data on
or the name of the file to send the compressed data
to.
Check ......... A file created by `Zoom' will be read and tested. If
a checksum is not in its correct place an error
message will be displayed. Unless the `Quiet' switch
is used a text file attached to the `Zoom' data file
in question will be displayed as well.
Example: `Zoom check ram:doodle'
Text .......... `Zoom' can attach a text file to an archive file which
will be displayed while/before data decompression. It
will be read and compressed before the actual disk
compression takes place.
Start ......... The track number to start compressing at. This
argument is optional and does not need to be entered.
By default the starting track is zero (= 0).
Example: `Zoom df0: to ram:dodo start 17 end 22'
End ........... The number of the last track to compress. Note that
you cannot ask for a starting track and omit the
ending track (and the other way round). Both
arguments must be used.
Crypt ......... Files created by `Zoom' may be encrypted with a
special password. The same password (Note: it is
case sensitive) will be required to decompress the
output file.
Example: `Zoom df0: to ram:doodle crypt Secret'
Cleardata ..... This switch may reduce the size of the output file
produced by compression. Under the `old' filing
system a data block contains the number of bytes which
are actually occupied by data. The rest of the data
block usually contains random data. If this switch is
active the unused portion of the data block will be
set to zero. Note: due to the different data block
format this switch has no effect if used on a disk
formatted by the fast filing system.
Clearblocks ... Not all blocks of a disk may be actually occupied by
data. `Zoom' uses the disk Bitmap to determine which
blocks to read and to compress. By default the Bitmap
is ignored. This switch will cause `Zoom' to skip
unused blocks. Note: this feature will be disabled
if the disk to be compressed is not a valid AmigaDOS
disk with a properly initialized root/boot block and a
valid Bitmap flag. Also important: this switch has
no effect if a set of tracks is to be compressed
instead of the default 0..79.
Verify ........ Each write access to disk will be verified if this
switch is active. The actual data verification will
be handled by the blitter, so it won't slow down the
decompression process too much.
SecLabels ..... `Zoom' will automatically compress sector label
information along with each track it reads if the disk
to be compressed is not a standard AmigaDOS format
disk or the `Clear Unused Blocks' switch has been
disabled.
In order to restore the sector label information
during compression, the destination disk has to be
formatted. `Zoom' will format the disk for you if the
`Format Sector Labels' switch is active. To save much
time, you could turn this switch off and format the
disk to write to before submitting it to `Zoom'.
Quiet ......... If this switch is in effect, `Zoom' will not display
text files attached to data files during
decompression.
NoPrompt ...... By default `Zoom' will prompt the user to insert the
source/destination disk to be used for
compression/decompression. If the `NoPrompt' switch
is in effect, `Zoom' will not wait for the user to
press return, compression/decompression will
immediately.
Selftest ...... This shell option was added to help you to verify if
your `Zoom' program has been infected by a virus.
`Zoom' will examine its internal hunk structure and
complain if a hunk is not in its standard size or
place. These are conditions which can, but need not
indicate link virus infection. While this technique
does not entirely prevent the creation of trojan
horse-versions of `Zoom' or that an extremely `clever'
virus infects `Zoom',it will probably catch all `dumb'
link viruses which put their virus code in front of
the first hunk or behind the last hunk of a program.
====================== `Zoom' Workbench usage ========================
======================================================================
If called from Workbench (or from Shell without any arguments) a
window will pop up under the mouse pointer containing the following
gadgets:
Select File ........... Select the name of the file to be
compressed/decompressed. It will be put into
the string gadget to the right of this button.
Select Drive .......... Select the the drive to read/write the data to
be compressed/decompressed from/to. This
button will cycle through all filing systems
which match the typical size and track
definitions of the builtin 3.5" disk drive.
The name of the filing system will be put into
the string gadget to the right of this button.
Enter Password ........ Will put up a requester in which the password
to be used for data compression/decompression
can be entered.
The program will refer to this password
when decompressing encrypted files and will
prompt for a new password if the password does
not match the encryption key.
If enabled (e.g. the `Encrypt Output File'
switch is active) the program will use this
password for output file encryption.
Select Text File ...... Select the text file to be prepended to all
output files, note: in order to use this
feature, the `Include Text File' switch must
be active.
Start Compression ..... Click this button to start data compression,
click it again to stop the process.
Start Decompression ... Click this button to start data decompression
click it again to stop the process.
Start File Check ...... Will read and examine the current `Zoom'
output file to detect file defects.
Start File View ....... will read the current `Zoom' output file and
display the text file attached to it (if any).
From Track To Track ... The starting and ending tracks to compress,
note that this feature has to be selected
explicitely.
Clear Unused Data ..... Unused data in standard file system blocks
will be set to zero if this feature is
enabled.
Clear Unused Blocks ... Unused blocks will be skipped if this switch
is in effect. Note: cannot be mixed with
`from track to track'.
Verify Write .......... Enables write verification while data files
are decompressed. This switch has no effect
during data compression.
Include Text File ..... If enabled, `Zoom' will prepend a text file to
be specified with the `Select Text File'
button to each output file it produces.
Encrypt Output File ... To have the output files `Zoom' produces
encrypted with a password turn this switch on
and enter an access key using the `Enter
Password' button.
Format Sector Labels .. `Zoom' will automatically compress sector
label information along with each track it
reads if the disk to be compressed is not a
standard AmigaDOS format disk or the `Clear
Unused Blocks' switch has been disabled.
In order to restore the sector label
information during compression, the
destination disk has to be formatted. `Zoom'
will format the disk for you if the `Format
Sector Labels' switch is active. To save much
time, you could turn this switch off and
format the disk to write to before submitting
it to `Zoom'.
The display on the right hand side of the `Zoom' window contains
the following elements:
Free Disk Space ....... The space left on the destination drive.
Available Memory ...... System memory currently available.
File Size ............. The size of the compressed data file.
Track Size ............ Size of the last compressed/decompressed
track(s). Usually two values will appear
here: the first one denotes the size of the
buffer after pre-compression, the second value
indicates the final size after Lh-compression.
Compression Ratio ..... This display denotes the amount of data saved
during compression. Note: this value refers
to the entire output file.
Current Track ......... Current track counter.
Elapsed Time .......... Time elapsed during data compression or
decompression.
Status ................ The action currently executed.
If an output file does not fit on the destination disk, compression
wil be terminated. The starting and ending tracks will be adjusted
accordingly to allow the user to continue to compress the disk where
the first compression run stopped.
The `name' of the file to be decompressed may be a wildcard
expression. `Zoom' will try to locate and decompress all files which
match the pattern (note: only the Intuition interface supports this
feature).
Multiple selection is supported as well: to decompress a row of
`Zoom' output files, hold down the shift-key, click the icons of files
you wish to decompress, then double-click the `Zoom' icon. Note:
`Zoom' will use the default options to decompress the files, the
online options can only be changed after all files have been
processed!
================ The `ZOOMOPTS' environment variable =================
======================================================================
The current settings displayed in the Intuition interface are saved in
a default environment variable which is read again when `Zoom' is
called again. This variable is set both in Manx/ARP and in Workbench
1.3 format. The following template is supported:
File/K,Drive/K,Start/K,End/K,TextFile/K,ClearData/S,ClearBlocks/S,
Verify/S,IncludeText/S,Encrypt/S,SecLabels/S,NoIcons/S
File .......... The default string to appear in the `File name'
gadget.
Drive ......... The string to appear in the `Drive' gadget.
Start ......... The first track to start data compression with.
End ........... The last track to compress.
TextFile ...... The name of the text file to be attached to each
output file produced.
ClearData ..... Whether unused block data is to be zeroed or not.
ClearBlocks ... Whether unused blocks are to be skipped or not.
Verify ........ Whether write verification is enabled or not.
IncludeText ... Set this flag if you want `Zoom' to include text files
with each output file it produces.
Encrypt ....... Set this flag if you want `Zoom' to encrypt each
output file it produces.
SecLabels ..... Set this flag if you want `Zoom' to format a disk
before decompressing a file which contains sector
label information to it.
NoIcons ....... Set this flag if you don't want `Zoom' to create icons
for each output file.
A sample `ZOOMOPTS' value is:
`FILE RAM:Blank.zom DRIVE DF0: CLEARDATA CLEARBLOCKS'
`Zoom' will prefer to set/examine the the `ZOOMOPTS' environment
variable in the AmigaDOS 1.3 standard. If this is not possible `Zoom'
will set/examine the Manx/ARP standard environment variable instead.
========================== Technical notes ===========================
======================================================================
`Zoom' needs approximateley 240K bytes of memory to perform its jobs.
Make sure that enough space is available, or `Zoom' will complain.
Note that disabling write verification will save about 10 KBytes of
chip memory.
The Lh data compression/decompression routines are related to LhArc
and PKZip. Unlike common data compression/decompression routines such
as employed by PowerPacker or Imploder, the performance of Lh cannot
be downgraded by adjusting the data sequence search depth. This means
that Lh will always compress trying to achieve the best results with
the maximum effort.
The byte-run compression/decompression code will fit entirely into
the instruction caches of the MC68020/68030/68040 processors, which
means that both compression and decompression time will go almost
unnoticed.
======================= How fast `Zoom' works ========================
======================================================================
I suppose you are shocked by the amount of memory required for data
compression / decompression. Well, as it turns out I traded speed for
memory. I tested `Zoom' (compressing a disk) against DMS 1.02
(running in medium mode), LhWarp 1.4 and Warp 1.2a with the following
results:
Workbench1.3D:
Tool | Output file | Time
-------+--------------+--------------
Warp | 496990 bytes | 11:49 minutes
LhWarp | 399889 bytes | 16:39 minutes
DMS | 480952 bytes | 11:00 minutes
Zoom | 383230 bytes | 6:15 minutes
============================== Credits ===============================
======================================================================
Credits go to Ralf Thanner who kept nagging until I finally started to
rewrite `Zoom', who also collected a list of most useful features you
can now find implemented in `Zoom' and who also organized the code
contributions without which `Zoom' would lack a great part of
functionality, to Henning Leise who contributed the excellent new
precompression code, to Georg Hörmann who donated his fine bootblock
virus recognition code, to Erik Løvendahl Sørensen for maintaining the
Amiga virus library, to Martin Berndt, who discovered the last errors
before `Zoom' went for release, to Arp programmers for the Arp 1.3
package without which `Zoom' would have been much more difficult to
implement and last but not least to all the beta testers.
================= Author's request and Gift-Ware fee =================
======================================================================
`Zoom' is released as Gift-Ware. If you like the program and use it
frequently, send a gift of any kind which you think will do as a
payment for the program to the author:
Olaf Barthel
Brabeckstrasse 35
D-3000 Hannover 71
Federal Republic of Germany
If an error shows up, do not hesitate to contact me as soon as
possible. My `real world' adress is given above, the following are my
EMail addresses:
Z-Netz: O.BARTHEL@A-Link-H
Usenet: o.barthel@a-link-h.zer.sub.org
cbmvax.commodore.com!cbmehq!sourcery!olsen
The entire `Zoom' package may be noncommercially redistributed,
provided that the package is always distributed in its complete form.
A small copy fee for media costs is okay but any kind of commercial
distribution is strictly forbidden!
Comments and suggestions how to improve this program are generally
appreciated!
============ Revision history (most recent change first) =============
======================================================================
5.4 Previous releases did not seem to like system fonts taller
than 11 pixels (fixed), the window layout now reflects
non-newlook and monochrome screens when opened, the program
now treats simple checksum errors on data blocks in a much
more tolerant way; instead of aborting the entire
decompression process, it will give the user a chance to skip
to the next data block or to abort the decompression. A small
bug in the pop-up requester code could cause system crashes
when running under control of Kickstart 1.2 and 1.3 (fixed).
This release incorporates the new bootblock virus detection
code from Georg Hörmann's `VirusZ' tool package.