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Message from discussion MIME-encoded messages in a digest (was: Re: Deleting unwanted message headers from saved email)
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Dave Gibson  
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 More options Sep 20 2012, 9:42 am
Newsgroups: comp.lang.awk
From: dave.gma+news...@googlemail.com.invalid (Dave Gibson)
Date: Thu, 20 Sep 2012 14:40:04 +0100
Local: Thurs, Sep 20 2012 9:40 am
Subject: MIME-encoded messages in a digest (was: Re: Deleting unwanted message headers from saved email)
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Steve Hayes <hayes...@telkomsa.net> wrote:
> On Wed, 19 Sep 2012 12:56:13 +0100, dave.gma+news...@googlemail.com.invalid
> (Dave Gibson) wrote:

>>Steve Hayes <hayes...@telkomsa.net> wrote:
>>> I'm not sure what that X-CC-Diagnistic thingy is. It seems big.

>>The gibberish is the message body encoded as base64 -- it's not
>>associated with a specific header.

> I've just been checking some of the messages I've been trying to save.

> These ones are hard to read and save:

> Content-Type: text/plain; charset="utf-8"
> Content-Transfer-Encoding: base64

> These are not quite as hard to read or save, but still cause some
> problems:

> Content-Type: text/plain; charset=utf-8
> Content-Transfer-Encoding: quoted-printable

> These ones are easy to read and save:

> Content-Type: text/plain; charset="us-ascii"
> Content-Transfer-Encoding: 7bit

> The ones that are hardest to read and save appear to be produced
> by Windows Live Mail.

They're standard MIME encodings intended to prevent message data being
corrupted in transit.

  <http://tools.ietf.org/html/rfc2045>

Your mail user agent should be able to convert them to local format
while saving them.

Have a look at these:

  <http://www.convertstring.com/EncodeDecode/Base64Decode>
  <http://www.convertstring.com/EncodeDecode/QuotedPrintableDecode>

> Perhaps one could tell awk to delete such messages.

Wouldn't you rather decode them?

  <http://www.fourmilab.ch/webtools/base64/>

Anyway, assuming messages are in a digest, separated by lines containing
the string "-- End --" and none of them are multipart messages.

#v+
----script begins on next line
/^-- End --/ {
  if (!b64)
    print
  body = 0
  b64 = 0
  next

}

b64 { next }

!body && /^$/ {
  for (n = 1; n <= hlines; n++)
    print header[n]
  hlines = 0
  body = 1  

}

body { print ; next }

/^[Cc][Oo][Nn][Tt][Ee][Nn][Tt]-[Tt][Rr][Aa][Nn][Ss][Ff][Ee][Rr]-[Ee][Nn][Cc ][Oo][Dd][Ii][Nn][Gg]: [Bb][Aa][Ss][Ee]64/ {
  b64 = 1
  hlines = 0
  next

}

{ header[++hlines] = $0 }
----script ends on previous line
#v-

>  Would it also
> be able to convert "quoted printable" into something more readable?

Perl has modules for dealing with various mail formats so may well be
better suited to your requirements.

#v+
----script begins on next line
BEGIN {
  hex["0"] = 0  ; hex["1"] = 1  ; hex["2"] = 2  ; hex["3"] = 3
  hex["4"] = 4  ; hex["5"] = 5  ; hex["6"] = 6  ; hex["7"] = 7
  hex["8"] = 8  ; hex["9"] = 9  ; hex["A"] = 10 ; hex["B"] = 11
  hex["C"] = 12 ; hex["D"] = 13 ; hex["E"] = 14 ; hex["F"] = 15
  for (n = 0 ; n <= 255; n++)
    ch[n] = sprintf("%c", n)

}

/^-- End --/ { qp = 0 ; body = 0 }

/^$/ { body = 1 }

!body && /^[Cc][Oo][Nn][Tt][Ee][Nn][Tt]-[Tt][Rr][Aa][Nn][Ss][Ff][Ee][Rr]-[Ee][Nn][Cc ][Oo][Dd][Ii][Nn][Gg]: [Qq][Uu][Oo][Tt][Ee][Dd]-[Pp][Rr][Ii][Nn][Tt][Aa][Bb][Ll][Ee]/ {
  qp = 1
  $NF = "8bit"

}

body && qp && /=/ {
  s = $0
  # Brackets '[', ']' on next line contain a space and a tab
  u = sub(/=[   ]*$/, "", s)
  t = ""
  while (match(s, /=[0-9A-F][0-9A-F]/)) {
    t = t substr(s, 1, RSTART - 1) \
        ch[hex[substr(s, RSTART + 1, 1)] * 16 + hex[substr(s, RSTART + 2, 1)]]
    s = substr(s, RSTART + RLENGTH)
  }
  $0 = t s
  if (u) {
    printf "%s", $0
    next
  }

}

{ print }
----script ends on previous line
#v-

 
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