bug#40407: [PATCH] slow ENCODE_FILE and DECODE_FILE

[Mattias Engdegård]

6 apr. 2020 kl. 16.21 skrev Eli Zaretskii <eliz@gnu.org>:

> Kenichi, why was coding-type of UTF-7 systems set to 'utf-8'?
> Wouldn't it be better to set it to 'utf-16'?  Or is there some
> subtlety here that we should be aware of?  Do you have any comments on
> the patch below?

There is no reason why utf-7[-imap] should have utf-8 as coding-type, is there? 
utf-16 is definitely wrong (utf-7* are encoded in ASCII). What about the patch 
below instead?

By the way, there appears to be another, unrelated bug in utf-7-imap: According 
to RFC 2060, all C0 controls are base64-encoded, but in Emacs some of them are 
passed through unchanged (CR, LF and TAB). This is permitted by plain UTF-7 
(RFC 1642) but not in the IMAP variant.

utf-7.diff
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