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Re: master d57bb0c: Treat passed strings as raw-text when percent-escapi

From: Robert Pluim
Subject: Re: master d57bb0c: Treat passed strings as raw-text when percent-escaping in epg
Date: Thu, 12 Dec 2019 17:11:07 +0100

>>>>> On Thu, 12 Dec 2019 16:42:04 +0100, Andreas Schwab <address@hidden> said:

    Andreas> On Dez 12 2019, Robert Pluim wrote:
    >> "can contain non-ASCII characters encoded using UTF-8", which means
    >> they end up in a multi-byte string in emacs.

    Andreas> Only encoded data can contain UTF-8 encoded characters.  A decoded
    Andreas> string just contains (Unicode) characters.

The data inside the gpg key is encoded, and is decoded by emacs into a
multi-byte string.

    >> No. The string that is passed to epg--decode-percent-escape can
    >> contain non-ASCII characters encoded as UTF-8,

    Andreas> If the argument of epg--decode-percent-escape is a multi-byte 
    Andreas> then it isn't encoded.

Yes, my terminology is confused.

    >> In order to convert those percent-escaped characters correctly, the
    >> string has to be treated as a unibyte array of bytes

    Andreas> Why?

It starts as a multibyte string containing non-ascii chars, plus a
representation of non-ascii chars using percent escapes, eg


epg--decode-percent-escape replace the escapes with the corresponding
characters, so now we have


when what we really want is


If we convert the initial string to 'bunch of bytes' before escaping,
then convert back to multibyte after, we get the correct


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