From: KurtB02@aol.com
Newsgroups: comp.binaries.cbm
Subject: [DOS]  ARCFIX.EXE  (72K)

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[Moderator's note:
 Upon testing this program I found that it likes vanilla DOS best, so don't

 run it in a DOS-box. Moreover, it seems to know only drive C:, no matter 
 from which drive you run it.]


>From time to time I have wanted/needed to extract single files from
an ARC or SDA file on my PC, without extracting the others.

I have also encountered what was probably Xmodem padding in the middle
of an archive, which makes it impossible to extract from the archive
anything that follows.

So I wrote this utility to do either or both. When you open an ARC or SDA
file with this utility, the entries within in it are displayed one
per line. The SDA machine-language header, if present, is skipped.

A movable pointer, controlled by the cursor keys, can be positioned
at any of the entries, and the selection of that entry can be toggled
with the <ENTER> key.

When all desired entries have been selected, an ARC or SDA file
can be written to disk with the appropriate function key.

As an example...my most recent upload of Commodore Educational
Software, SCIENCE3.SDA, had the following directory:


Directory for: science3.sda
==================================================
FILENAME       TYPE BLKS NOW  V STOWAGE    DATE
==================================================
sda232.64         p   9  ---  - --------
charge.c3         p  36   27  2 crunched 01jan1980
chemist quiz.c3   p  39   30  2 crunched 01jan1980
chemist.c3        p  37   26  2 crunched 01jan1980
circuits.c3       p  63   46  2 crunched 01jan1980
==================================================
Files: 4            175
          
          
The display that ARFIX provided for it looked like this:

F1 - Open File                  Cursor up/down - Move Marker
F2 - Write ARC file                     RETURN - Mark/Unmark
F3 - Write SDA file                     F10 - View Help
F4 - Exit Program                       Blocks Selected:   0
----------------------------------------------------------------------
     Name             Start       End
> charge.c3           2287        9144
  chemist quiz.c3     9145        16764
  chemist.c3          16765       23368
  circuits.c3         23369       35052
  End of File         35052


The starting offset here is 2287 because the 9-block SDA header
was skipped (an ARC file would normally begin with an offset of 1).

The selection cursor is on "charge.c3".

The utility is written in QuickBasic 1.0 and will run in either
DOS or Windows (3.1 anyway...I don't have 95). It has one known
bug: it crashes if it encounters a one-pass-crunched file.

Hope you find it useful.

Kurt