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lbrate 1.1 - extract/decompress CP/M LBR archives.
Copyright (C) 2001 Russell Marks.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


lbrate extracts/decompresses files from the CP/M LBR format. (It can
also list and test such archives.) It does this in an `unzip'-like
manner, mostly hiding the details of individually compressed and
renamed files, and transparently deals with the required

(It can also work on CP/M-ish compressed files (`squeezed', etc.)
outside of such archives, treating them as if they were really
single-member LBRs.)

For more on how lbrate works and how to use it, do `man lbrate' once
it's installed. You might also want to check the "FILENAME ISSUES"
section if the description sounded a bit confusing... :-)


Check the Makefile is ok (it should be), then do `make' and (as root)
`make install'.

Why not just use `lar', `xusq', and `uncr'?

Firstly, all previous decompressors that I'm aware of for the CP/M
"Q", "Z", and "Y" compression types (including both the original CP/M
tools and `xusq'/`uncr') have been non-Free. This is less than ideal

That apart, here are some practical reasons:

- lbrate does the whole process in one. Admittedly you could script up
  something similar which used lar/xusq/uncr (I used to use something
  like this myself), but it wouldn't really work as well.

- lbrate can extract "Y" type (LZH) compressed files, both 1.x and 2.x
  versions. I believe it's the first non-CP/M program to support this

- lbrate supports extracting version 1.x crunched files, which `uncr'

- lar doesn't check LBR CRCs, and therefore can't test the integrity
  of LBRs.

Who uses LBR files, anyway?

Even if no-one were ever to create a new LBR file, there's still a
*lot* of existing CP/M software that is only available in this format.
If you're going to use CP/M stuff, you pretty much have to be able to
read LBRs (and .arc/.ark files, which are extractable with `nomarch').
For example, the Walnut Creek CP/M CD contains well over 4000 LBR

What about Unisys?

lbrate is capable of reading LZW-compressed files (`crunched' files
use LZW), so it has the same legal status as a GIF decoder. Even in
their current set-lawyers-to-kill state, I don't think Unisys have a
problem with programs which only *read* LZW. Their patent expires soon
anyway, and once that happens we can all just point at them and laugh.
I know I will. :-)

As for other patents, LZH compression is covered by US patent no.
4,906,991 (which seems to claim all tree-using LZ77), but the patent
does not claim any form of decompression. Since lbrate only
decompresses, it should be ok.

Is readlzh.c really GPL?

Yes - the original author gave explicit permission for me to do this.
For the background, read the comment at the top of readlzh.c, and see

Contacting me

You can email me at

Share and enjoy!

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