Article View: comp.mail.mime
Article #15Re: X.400 and multimedia mail
From: David Collier-Brown
Date: Sat, 12 Dec 1992 03:20
Date: Sat, 12 Dec 1992 03:20
35 lines
2242 bytes
2242 bytes
|In article <1galsqINNr88@gap.caltech.edu> jack@ccsf.caltech.edu (Jack Stewart) writes: |>As I understand, the main reason for MIME to use base64 encoding (as |>opposed to uuencode, 8bit transparent, XDR, or BER ) was that they |>needed an encoded scheme that would remain uncorrupted accross all |>platforms and architectures and existing mailers. Apparently this is |>a real problem with IBM VM/CMS machines. base64 encoding was the only |>thing that would survive these machines. Hopefully these machines |>will go away some day and then we can use a more reasonable encoding |>mechanism. ag129@cus.cam.ac.uk (Alasdair Grant) writes: |Yes, but this is a minor problem compared to the presence of machines |which use the 7-bit American ASCII code, where the top bit is a parity |bit. Since no-one buys GCOS anymore, who cares? (half a (:-)). Seriously, though, there are very few machines still in existance which have a byte size of 6 bits or less. Given that common communications channels are 8-bit, it is reasonable to expect that an 8-bit-clean smtp path and an 8-bit-clean file system will allow the elimination of 7-bit ascii as soon as it's worth the vendors' while. 16-bit is the real problem. --dave [ps: Honeywell, IBM 7070s and DEC-10s ran to 36-bit words, and tended to use 6-bit almost-ascii codes. Honeybuns actually could store strings of 7-bit characters, assuming you really, truly, wanted to. Sane honeybuns ran Multics, however, and used 9-bit bytes. --dave] -- David Collier-Brown, | davecb@CCS.YorkU.CA | lethe!dave 72 Abitibi Ave., | Willowdale, Ontario, | York Postmaster and CANADA. 416-223-8968 | occasional sendfail(8) consultant.
Technical Details
Message-ID:
<davecb.724130413@yorku.ca>Path:
arc1-ca.pugleaf.net!sparky!uunet!utcsri!torn!newshub.ccs.yorku.ca!yorku.ca!davecbReferences:
<davecb.724004446@yorku.ca> <1992Dec11.153138.2198@ericsson.se> <1galsqINNr88@gap.caltech.edu> <1992Dec11.201947.17868@infodev.cam.ac.uk>Show Full Headers
Complete Article Headers
Newsgroups: comp.mail.mime Path: arc1-ca.pugleaf.net!sparky!uunet!utcsri!torn!newshub.ccs.yorku.ca!yorku.ca!davecb From: davecb@nexus.yorku.ca (David Collier-Brown) Subject: Re: X.400 and multimedia mail Message-ID: <davecb.724130413@yorku.ca> Sender: news@newshub.ccs.yorku.ca (USENET News System) Organization: York University References: <davecb.724004446@yorku.ca> <1992Dec11.153138.2198@ericsson.se> <1galsqINNr88@gap.caltech.edu> <1992Dec11.201947.17868@infodev.cam.ac.uk> Date: Sat, 12 Dec 1992 03:20:13 GMT Lines: 35