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Translator Documentation
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About btoa_atob Translator
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1991-01-06
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btoa/atob Translator for StuffIt Deluxe
Version 1.0.1 of 91.01.06.
Written by Raymond Lau
Copyright (C) 1990, Raymond Lau. All Rights Reserved.
This software is being licensed to you free of cost.
Please see Terms of usage and distribution at the end
of this document for information regarding your right
to use and distribute this software.
Introduction:
btoa/atob Translator is an external translator for use
with StuffIt Deluxe, available from Aladdin Systems, Inc.,
Deer Part Center, #23A-171, Aptos, CA 95003-4723.
This translator provided compatibility with the UNIX filters
"btoa" and "atob."
btoa and atob are UNIX filters which convert 8 bit binary
data to 7 bit ASCII data for transmission across channels
which only support 7 bit ASCII data. For example, you can
only email 7 bit ASCII data with SMTP. btoa/atob performs
the same function as uuencode/uudecode in the UNIX world but
more efficiently, encoding 4 bytes into 5 instead of 3 into 4.
BinHex4 on the Mac performs a similar function.
Why use btoa/atob instead of other similar utilities?
1. btoa/atob is the most effective ASCII encoder
compatible with UNIX SMTP mailers that I know of.
2. btoa/atob is compatible with the encoding used
by the popular "tarmail" script.
Why use something OTHER than btoa/atob?
1. With the MacBinary option built into this translator,
you can transfer entire Macintosh files, including
applications, as 7 bit ASCII data. However, the
protocol provided here is not as of this writing
an accepted standard whereas BinHex4 is for this
purpose. Also, BinHex4 provides better error
detection. However, the error detection in
btoa/atob is reasonably sound.
Installation:
The rest of this documentation assumes that you have properly
installed StuffIt Deluxe and are familiar with the operation
of StuffIt Deluxe.
To install this translator, placed it in the Translators
folder in the System folder of your startup drive. Then
launch (or quit and relaunch, as appropriate) StuffIt Deluxe.
If you are in Standard menu mode, you must switch to Expert
menu mode to use this translator.
Operation:
After installation, you should have a new choice under the
Other menu with the name "btoa/atob." This item has
2 subitems. The subitems are Binary to ASCII... and ASCII
to Binary...
To convert a binary file to ASCII, select Binary to ASCII.
At the bottom of the dialog should be a checkbox labelled
"Make MacBinary." If you are encoding a "Macintosh" file,
you should have this checked. Doing so will cause the
translator to first convert your file to MacBinary format
before doing btoa translation. If you only wish to encode
the data fork of a file, without saving information about
the file such as its type/creator, then uncheck this.
Example: You want to email an application to your friend.
Check Make MacBinary.
You have a binary PostScript file and want to
email it to a distant location for printing
from a UNIX printer server. Uncheck Make
MacBinary.
Note: The MacBinary encoding is compatible with the
mbget/mbput filters.
To convert an encoded ASCII file to a binary file, select
ASCII to Binary. Normally, you should keep Recognize
MacBinary checked. The translator will know when a file
being decoded has been MacBinary encoded and when it hasn't.
However, if you know the file was not from a Macintosh
source (or that it wasn't MacBinary encoded), then keep this
unchecked. The MacBinary header does not have rigorous
presence indicators built into it so non-MB encoded files may
be mistaken for MB encoded files.
Changes from 1.0 to 1.0.1:
When decoding non-MacBinary files whose size is not a multiple
of 4, extra null padding inserted by the encoder was not
stripped properly, resulting in an error and an extra 1-3 null
bytes at the end of file.
When an error occurs, the beach ball was not stopped from
spinning.
Appendix A: Excerpts from man page for the btoa/atob filters.
NAME: btoa, atob, tarmail, untarmail encode/decode binary to
printable ASCII
SYNOPSIS: btoa < inbinary > outtext
atob < intext > outbinary
tarmail who subject files ...
DESCRIPTION: btoa is a filter that reads anything from the
standard input, and encodes it into printable ASCII
on the standard output. It also attaches checksum
information used by the reverse filter "atob" to
check integrity. atob gives NO output (and exits
with an error message) if its input is garbage or the
checksums do not check.
Appendix B: Terms of usage and distribution:
Although copyrighted, this software is being licensed
to you for your use free of charge. However, ownership
of and interest in this software shall remain with the
author. Use and distribution of this software is
governed by the following terms in an effort to
reasonably insure that this software will remain
freely available and that no one other than the author
will derive a commercial benefit from distributing
this software.
LICENSE AGREEMENT
"You," "your," and the "user" refers to any person or
entity which acquires or uses this software.
"Software" refers to any computer programs identified
at the start of this documentation file, together with
all codes, techniques, software tools, formats, designs,
concepts, methods, ideas, and documentation assoicated
with the computer program(s). The term also includes
all copies of any part of the software and documentation.
"Author" refers to the author of this software, Raymond
Lau.
This software is owned by the author and contains
valuable and proprietary information of the author's.
If you violate any part of this agreement, your right
to use this software terminates automatically. In the
event of termination of this agreement, you must destroy
all copies of this software and derivatives of this
software in your possession and cease distributing the
same.
This software is being licensed to you as provided by
the terms of this agreement.
You may:
1. Use this software on as many computers
as you want at any given time.
2. Make as many backup copies of this software as
you want.
3. Alter the software in any manner you see fit
FOR YOUR OWN PERSONAL USE. Such altered versions
should not be distributed. The creation of
such derivatives shall not diminish the author's
title to this software.
4. Terminate this agreement at any time by destroying
all copies of this software and derivatives of
this software and cease distributing the same.
You may not:
1. Create any derivative works from this software
for distribution.
2. Reverse engineer, disassemble, decompile, or
otherwise attempt to discover the source code to
this software.
3. Use this software in any manner as to discover
proprietary information relating to the Translator
interface in StuffIt Deluxe and/or StuffIt Classic.
You may distribute this software provided that:
1. This software is distributed free of any charges
except as provided for under 1a. This software may
not be sub-licensed, sold, lent, rented, or leased
except as provided for under 1a.
1a. You may charge a nominal fee to cover
duplication, shipping and/or handling costs
of distributing this software provided that
the pro-rata fee (ex: the fee of ordering a
disk/CD/tape/etc divided by the number of
programs on it) does not exceed US $1. You
may include this software in any compilation
even if you sell the compilation for a
profit provided that the pro-rata fee defined
above does not exceed US $1 for this software.
You may also charge your usual timesharing,
network usage and/or membership fee if you
distribute this software electronically.
While you may claim a compilation copyright
on any compilations which include this
software, interest in and ownership of this
software shall remain with the author.
2. You include this documentation file with the
distribution.
3. You do not modify either this documentation file
or the software itself.
4. You do not use the name of this software or
of the author or the fact that you provide this
software in any promotional material relating
to your distribution of this software. However, you
may include such information in a catalog listing of
your offerings.
5. You may not transfer this software in a manner as
to violate any regulations relating to the transfer
of software, including the US Export Administration
Act.
Disclaimer of warranty:
In using this software, you understand and agree that this
software is provided "as is" without warranty of any kind.
The entire risk as to the results and performance of using
this software lies entirely with you, the user. The author
does not make any warranties, either expressed or implied,
including but not limited to implied warranties of
merchantability and fitness for a particular purpose, with
respect to this software.
In no event shall the author be liable for any consequential,
incidental, or special damages whatsoever (including without
limitation damages for loss of critical data, loss of profits,
interruption of business, and the like) arising out of the
use or inability to use this software. Because some states
do not allow the exclusion or limitation of liability for
consequential or incidental damages, the above limitations
may not apply to you.
Although the author would appreciate any feedback and bug
reports, the author shall not be responsible for correcting
any problems which you discover or otherwise help you
maintain and use this software. Furthermore, the author
may at any time replace, modify, alter, improve, enhance
or change this software.
Complete agreement:
This agreement constitues the entire agreement and supersedes
any prior agreements between you and the author concerning
this software. This agreement cannot be amended, modified,
or waived except in writing.
General:
If any provision of this agreement shall be found to be
unenforcible, it shall be deemed severed from the remainder
of this agreement.
This agreement shall be construed in accordance with the laws
of the State of New York. Any arbitration or litigation
relating to this agreement shall take place in the State of
New York.
U.S. GOVERNMENT RESTRICTED RIGHTS
This Software is provided with RESTRICTED RIGHTS. Use,
duplication, or disclosure by the government is subject to
restrictions set forth in subparagraph (c)(1)(ii) of the
Rights in Technical Data and Computer Software clause at
48 CFR 252.227-7013, or in subparagraphs (a) through (d) of
the Commercial Computer Software Restricted Rights clause at
48 CFR 52.227-19, as applicable. The contractor/manufacturer
is Raymond Lau, 100-04 70 Ave., Forest Hills, NY 11375-5133.