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Simtel MSDOS 1992 September
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Simtel20_Sept92.cdr
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arc_lbr
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ldarc.arc
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LDARC.MAN
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1989-07-09
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Differnce Archiving.Program LDarc ver 1.03
------------------------------------------
July 9, 1989
1. How to make the latest version of LDarc.
You have following files in this package.
LDarc.man :this File,
LDarc.exe :LDarc ver.1.00,
LDarc101.lzd :compressed difference file to create v.101 from v.100,
LDarc102.lzd :Compressed difference file to create v.102 from v.101,
LDarc103.lzd :compressed difference file to create v.103 from v.102.
Please type in the following sequence;
LDarc LDarc101.lzd
LDarc LDarc102.lzd
LDarc LDarc103.lzd.
You will have LDarc100.exe,LDarc101.exe and LDarc102.exe. They are
eXtracted from the old_files and compressed difference files. You
also have LDarc.exe which is the newest LDarc.exe version 1.03.
You may try the same thing with
LDarc x LDarc101.lzd LDarc.exe LDarc.exe
Commands.
========
There are X,C,H commands in the present version.
LDarc h <CR>
is the same with
LDarc <CR>.
You will see a small help screen.
X command is the default command of LDarc.exe. File extension .lzd
shows that is is a compressed difference file. Ordinary usage is;
LDarc [x] compdiff.lzd [old_file.ext] [new_file.ext]
LDarc will eXtracts 'compdiff.lzd' file and replaces differences
into specified positions of 'old_file.ext' and get 'new_file.ext'.
If you do not specify 'old_file.ext', then you will have names as is
specified by 'diffcomp.lzd'.
If you do not specify 'new_file.ext' then 'diffcomp.lzd' will
automatically takes its name from the spcified.
C command is to Create the difference file and to Compact it.
LDarc c [ 23.lzd ] LDarc102.exe LDarc103.exe
the old_file 'LDarc102.exe' and 'LDarc.exe'.
If you do not specify the difference file, you will have the
'new_file.lzd', that is LDarc103.lzd in the present case.
General usage is:
LDarc c [diffcomp.lzd] old_file.ext new_file.ext
You must always supply extension names to 'old_file' and 'new_file'.
Comments.
--------
1. The largest old_file you can revise is 256 KB.
2. The longest word length in comparison is 16 KB.
3. You will see a pair of running numbers under the command
line.
Numbers on the left: Number of charcters in
output stream.
on the right: Number of words fit more
than 4 charcters.
4. Old_file will be checked with file-length and CRC check.
New file will be tested with CRC.
5. Error will be reported when there is no files specified
where LDarc needs one.
6. Please inform 74100,2565 Kenjirou Okubo if you have a
file which can not be restored with C,X commands to the
original. You will see a CRC error.
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