Re: [WinMac] Cross-platform email

Blake Lange(blange[at]fec.gov)
Mon, 21 Dec 1998 11:00:30 -0500

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Although my knowledge of encodings is only as a user I don't think I am
mixing them up. The Claris Emailer Help says that if someone is attaching a
file that is going to both MacOS and WinOS recipients they should use the
Apple Double encoding. The following is their description of the Apple
Doube encoding, "Apple Double splits the two forks into separate files. The
files are then further encoded using Base 64. If the enclosure is sent to a
MacOS computer, the two forks are re-integrated when they are received. If
the enclosure is sent to a non-MacOS computer, the resource fork file is
ignored and the data is extracted from the data fork file in a form that is
usable on the receiving computer." Thus simple Base64 encoding does not
retain the resource fork while Apple Double encoding does, as I said.
Everything you said, except for saying that my explanation was mixing the
encodings, also seems true.

Leonard Rosenthol <leonardr@Adobe.COM> on 12/18/98 12:34:34 PM

Please respond to The Windows-MacOS cooperation list
<winmac@xerxes.frit.utexas.edu>

To: The Windows-MacOS cooperation list <winmac@xerxes.frit.utexas.edu>
cc: (bcc: Blake Lange/FEC/US)
Subject: Re: [WinMac] Cross-platform email

At 11:33 AM -0500 12/18/98, Blake Lange wrote:
> It is my understanding that Base64 encoding did not retain the resource
> fork. In order to retain the resource fork Apple Double is better because
> it creates two files, one of the resource fork and one of the data fork
> which is equivalent to the Base64 file.
>
You're mixing your encodings :(.

The way that MIME works (or more specifically in this case,
the Mac extensions to MIME) is that the file is first AppleSingle or
AppleDoubled (the latter is preferred) and THEN Base64 encoded.

Leonard
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Leonard Rosenthol <mailto:leonardr@adobe.com>
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