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UNSIT.DOC
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1988-03-01
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UNSIT -- StuffIt Achive File Disassembler
-----------------------------------------
VERSION 2.0 26 Feb 1988
UNSIT 2.0 now has an option to add a MacBinary header. Some DOS
program require this header for proper operation. An extracted file
with the MacBinary header should now exactly match the file uploaded
directly from a Mac. A MacBinary header is added to Mac files when
they are transmitted by almost all Mac terminal programs. The header
contains information from the Mac directory entry for that file such
as file name, file type, and attribute flags.
A Mac file with a MacBinary header contain a resource fork and a
data fork, either of which may be empty. Some DOS programs do not
work correctly if the Mac file contains a non-empty resource fork so
there is an option to extract just the data fork even if both forks
are present in the SIT file. It is also possible to extract both
forks into a single file.
No new option flags have been added. You will have the option to
put a MacBinary header or not when extracting each file. This makes
it easier to extract a binary data file with a header then extract a
text file without a header in one pass through the Stuffit file.
INTRODUCTION:
UNSIT is a simple utility for PC users to extract files from a
StuffIt file. StuffIt files usually appear with the ".SIT" extension.
StuffIt is a program for Macs similar to ARC for PCs. It
collects several files in a single file and also compresses the data
using run length, Huffman, or LZW compression. StuffIt is emerging as
THE archive program for the Mac. Unfortunately, this means new Mac
files are frequently inaccessible they are now "stuffed" to save
transmission costs and disk space.
Most Mac files are not very useful on a PC but MacPaint picture
files are an exception. There are several programs including READMAC
and ALLMAC that can display and print MacPaint files on a PC. Once
displayed, some PC paint programs can capture the image from video RAM
into a file appropriate for that program for further manipulation.
Other programs such as MactoWin and MacShow can directly convert
MacPaint files to Microsoft Windows Paint format.
UNSIT does not handle PackIt archive files which usually appear
with the ".PIT" extension. An extract-only utility called UnPackIt is
available on the PC.
VERSION:
UNSIT Version 1.1
PURPOSE:
List files in and extract files from a StuffIt archive file on a
PC.
COMMAND OPTIONS:
unsit [l|v|x|e|xb|eb] StuffItFile[.SIT]
l, v = list directory of files
x, e = extract all files with CR to CR LF translation on text
files
xb, eb = extract all files with no translation
Mac files come with in two parts, the resource fork and data
fork. I have not found any use on the PC for the resource fork but
UNSIT will extract it anyway.
The normal EXTRACT options, 'x' or 'e', will automatically
convert Mac text files to PC text files. The only difference appears
to be Mac text file lines end with only a carriage return (CR) while
PC text file lines end with carriage return (CR) and line feed (LF).
If the translation causes any problems, use the EXTRACT BINARY
options, 'xb' or 'eb', which never do any translation. Non-text files
are always extracted with NO translation.
NOTICES:
Copyright (c) 1988, Brian K. Uechi. Portions of this program
written and copyrighted by Raymond Lau. You may copy and distribute
this program freely, provided that it is distributed ONLY in its
original, unmodified state.
DISCLAIMER: No warranty of any kind is made with regard to this
program. The Authors shall be not liable for errors contained herein
or for incidental or consequential damages in connection with
furnishing, performance, or use of this material.
Brian K. Uechi
GEnie: B.UECHI
CompuServe: 72330,155