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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: Base64 encode using using windows-1250 encoding
Date: Sat, 9 Jun 2018 12:30:02 +0200
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On 08.06.2018 at 16:21, Jupi wrote:

> I need to encode string using Central European Windows-1250 encoding.
> I know how to use simple base64 but it is utf-8 encoded and I need
> windows-1250.

From reading the rest of the discussion so far, it seems to me that you
have some (UTF-16/UCS-2 encoded) string, and you want to base64 encode
the string's CP-1250 representation.  Since you have not told in which
environment you're working, and since some examples used “windows”, I
assume you're working in a browser enviroment, where, to my knowledge,
there is no readily available solution for this task.  You can, however,
write your own encoding function by doing the mapping manually.  A
simplified, inelegant and incomplete example:

    function encode(str) {
        var map = {"š": "\x9a", "ć": "\xe6"};
        var dest = "";
        Array.prototype.forEach.call(str, function (ch) {
            dest += ch in map ? map[ch] : ch;
        });
        return btoa(dest);
    }

    encode("Perišić");

-- 
Christoph M. Becker