fetching mail w Synapse decoding utf-8 in subject
lazarus / 38-Networking and Web Programming

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holger.ernst · 2014-06-18 12:48

When I fetch headers via synapse i geh something like this:
Subject:  =?utf-8?Q?=53=43=48=41....
when the subject is provided in UTF-8 (my assumption).
How can I decode that?

Best regards Holger

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3mptyCode · 2020-03-30 19:39

Even if your post is not that new, maybe you still like to get a
solution or already found a better one ?

At this post you can read my workaround-solution:
https://forum.lazarus.freepascal.org/index.php/topic,47556.0.html

Best regards

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Remy Lebeau · 2020-03-30 21:50

Quote from: holger.ernst on June 18, 2014, 02:48:10 pmHow can I decode
that?

Look at RFC 2047.  The text is encoded as follows:

Quoteencoded-word = "=?" charset "?" encoding "?" encoded-text "?="
For each encoded-word in the text (there may be multiple), split it
into those 3 pieces, then decode the encoded-text into bytes based on
the specified encoding (Q = quoted printable, B = base64), then decode
those bytes into a string based on the specified charset, then replace
the entire encoded-word with the decoded string.

So, for example:

Code: [Select]=?utf-8?Q?=53=43=48=41...?=
breaks up into

Code: [Select]utf-8
Q
=53=43=48=41...

Then "=53=43=48=41...." becomes the byte sequence

Code: [Select]$53 $43 $48 $41 ...
Which decoded as UTF-8 is the string 'SCHA...'.

This is not very difficult to implement by hand, or you can find a 3rd
party MIME library to handle it for you (FYI, Indy has built-in
support for this format).