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1991-12-22
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=========================================================================
LhA V1.00
LhArc and LHA compatible archiver for the
Commodore-Amiga Computer
Copyright (c) 1991,92 By Stefan Boberg
=========================================================================
This is a brief list of the features of the LhA program.. For more
detailed information about the program and it's operation please refer to
the user's manual in `LhA.man'.
o LhA is faster than any other archiver currently available for the
Commodore-Amiga computer and also features the best compression
performance. For comparisons with other archivers speed- and
compression-wise take a look at the `benchm.txt' file.
o LhA is compatible with the MS-DOS archivers `LhArc V1.13' and `LHA
V2.13' as well as *NIX LhArc V1.01.
o LhA is very memory-efficient, and can be configured to only use
approx. 100K (including program) for decompression of files using any
compression mode. Compression can be performed in approx. 205KB with
both -lh1- and -lh5- compression modes.
o LhA has been written with stability and reliability in mind, it will
handle all kinds of errors during archiving and extraction. This is
something other LhArc/LHA-style archivers have handled more or less
badly.
o The compression and decompression routines have been carefully
optimized and tested in order to eliminate bugs and at the same time
offer unparalelled compression and decompression performance.
o LhA is multitasking reentrant and pure, and can be made resident with
the KS1.3, KS2.0, WShell and other compatible `resident' commands. This
means several processes can run on the same code, and the code does
not have to be re-loaded every time it is run.
o The registered-user version of the archiver (which is only available
to registered users) features even faster compression and handles
multiple-volume archives. It also has a great number of additional
commands and options that are not available with any other archiver.
o LhA has very powerful and flexible command line parsing. You can use
wildcards for both archives and action-files with all commands and you
can also include any file anywhere on the command line, so that it
appears to LhA as if you had written the contents of the include-file
at the command line. LhA also has an unique `home directory'
specification technique that can be used to specify what parts of the
paths that should be stored in the archive file.
o LhASFX, which is part of the LhA package, is able to create SFX (self-
extracting) archives from ordinary LhA-archives. SFX archives are
archives that can be extracted/listed/tested by simply executing the
archive. For more information refer to the LhASFX documentation. The
SFX-archives LhASFX creates are very memory-efficient, only requires
48K to run regardless of archive size.
o Later on, the LhA package will be extended with an archiver with a full
graphical and ARexx interface. This will be made available to
registered users of LhA, and a cut-down evaluation version will be
released to the public. It will have all the capabilities LhA, and can
easily be expanded to handle other archive formats (such as ZIP, ARJ
and ZOO), by installing a shared, resident library into LIBS:.
o A file system device is also under development, to enable the user to
treat archive files like directories on disks, and thus be able to
access files in archives without having to extract them from the
archive first. Thus you will be able to use compressed files with any
AmigaDOS-compatible program in existence! Great for storing
documentation and other highly compressible files! This device uses the
same libraries as the GUI archiver described above, and will this be
handle all kinds of archive formats, as soon as the libraries have
been written.
=========================================================================
_
(_`
... ,_)tefan