Description:
------------
Using mailparse_msg_get_part_data() on a specific mail message truncates the attachment filename.

The relevant mail headers are:

Message-ID: <Pine.LNX.4.63.0511211500190.29068@octet.ca>
MIME-Version: 1.0
Content-Type: MULTIPART/MIXED; BOUNDARY="8323328-184856383-1132603777=:29068"

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--8323328-184856383-1132603777=:29068
Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: QUOTED-PRINTABLE

[some text]

--8323328-184856383-1132603777=:29068
Content-Type: IMAGE/png; name=I_nw_r1_YUL_2005112112_017.png
Content-Transfer-Encoding: BASE64
Content-ID: <Pine.LNX.4.63.0511211509370.29068@octet.ca>
Content-Description:
Content-Disposition: attachment; filename=I_nw_r1_YUL_2005112112_017.png

[some data]

--8323328-184856383-1132603777=:29068--

You may get the original mail message for testing purposes at:
http://ptaff.ca/arc/mail.txt


Reproduce code:
---------------
This simple test fetches metadata about the message part:

<?php
  $foo = mailparse_msg_parse_file(mailfile.txt);
  $bar = mailparse_msg_get_structure($foo);
  $fred = mailparse_msg_get_part_data($foo);
  $barney = mailparse_msg_get_part($foo, $bar[2]);
  $wilma = mailparse_msg_get_part_data($barney);
  print_r($wilma);
?>


Expected result:
----------------
The [disposition-filename] and [content-name] should have a ".png" extension

Actual result:
--------------
Array
(
    [headers] => Array
        (
            [content-type] => IMAGE/png; name=I_nw_r1_YUL_2005112112_017.png
            [content-transfer-encoding] => BASE64
            [content-id] => <Pine.LNX.4.63.0511211509370.29068@octet.ca>
            [content-description] => 
            [content-disposition] => attachment; filename=I_nw_r1_YUL_2005112112_017.png
        )

    [starting-pos] => 2380
    [starting-pos-body] => 2628
    [ending-pos] => 37386
    [ending-pos-body] => 37386
    [line-count] => 576
    [body-line-count] => 570
    [charset] => us-ascii
    [transfer-encoding] => base64
    [content-name] => I_nw_r1_YUL_2005112112_017
    [content-type] => image/png
    [disposition-filename] => I_nw_r1_YUL_2005112112_017
    [content-disposition] => attachment
    [content-base] => /
    [content-id] => Pine.LNX.4.63.0511211509370.29068@octet.ca
    [content-description] => 
)