Re: ISO 2022

[Jeffrey Altman <jaltman@watsun.cc.columbia.edu>]

> -----Original Message-----
> From: Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>
> 
> >ISO 2022 was intended as a generic
> >tell-me-the-encoding-of-the-following-bytes mechanism.
> 
>  It is necessary to note, that the ISO 2022 is essentially focused
> on the 7-bit and not 8-bit clean. The 'large' charsets are divided into
> 96-chars-long parts. Some codepoints from an interval 0x80..0x9f
> are forbidden for character encoding, because are used for switching
> between parts : si, so, ss1, ss2, lsl1, lsl2, lsl3, lsl4 e.t.c.
> 
>  At the same time there are 8-bit charsets, which completely ignore the
> ISO 2022 and use the codepoints 0x80..0x9f, for example all MS-DOS
> CodePages (charset="IBM866" aka CP866, for example).
> 

And that is because Code Pages are not compatible with ISO 2022.
Using a Code Page is just like using UTF8.  There is an escape 
sequence which disables ISO 2022 and activates the Code Page until
such time as ISO 2022 is reactivated.


    Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
                 The Kermit Project * Columbia University
              612 West 115th St #716 * New York, NY * 10025
  http://www.kermit-project.org/k95.html * kermit-support@kermit-project.org


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