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new mail_encode function to make sure we abide to the rfc but not split in-between of multibyte characters. The used method is not 100% accurate, but a good compromise between compatibility, conformance and performance.

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git-svn-id: file:///svn/phpbb/trunk@6639 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
Meik Sievertsen 2006-11-23 11:53:52 +00:00
parent 3f69e7278c
commit 5a73807c9b
1 changed files with 43 additions and 13 deletions
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56
phpBB/includes/functions_messenger.php
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@ -1368,33 +1368,63 @@ class smtp_class
}
/**
* Encodes the given string for proper display in UTF-8 ... nabbed
* from php.net and modified. There is an alternative encoding method which
* may produce less output but it's questionable as to its worth in this
* scenario.
* Encodes the given string for proper display in UTF-8.
*
* This version is using base64 encoded data. The downside of this
* is if the mail client does not understand this encoding the user
* is basically doomed with an unreadable subject.
*
* Please note that this version fully supports RFC 2045 section 6.8 to
* the expense of using more resources. It downgrades to non-compliance (but workable)
* if the string is not able to be splitted properly.
* You are able to force non-compliance.
*/
function mail_encode($str)
function mail_encode($str, $compliant = true)
{
// define start delimimter, end delimiter and spacer
$end = '?=';
$start = '=?UTF-8?B?';
$spacer = "$end $start";
// determine length of encoded text within chunks and ensure length is even
$length = 76 - strlen($start) - strlen($end);
$length = floor($length / 2) * 2;
$encoded_str = base64_encode($str);
$split_length = 64;
// encode the string and split it into chunks with spacers after each chunk
$str = chunk_split(base64_encode($str), $length, $spacer);
// Pass back if the encoded string does not need to be split or forced.
if (!$compliant || strlen($encoded_str) <= $split_length)
{
return $start . $encoded_str . $end;
}
// remove trailing spacer and add start and end delimiters
$str = preg_replace('#' . preg_quote($spacer, '#') . '$#', '', $str);
// What we do is encoding/decoding forth and back and checking
// for a valid utf8 string to make sure no lines include half-baked data.
$correct_encode = false;
return $start . $str . $end;
// Also quit the operation if the chunks get too small
while (!$correct_encode || $split_length < 10)
{
$chunks = str_split($encoded_str, $split_length);
$correct_encode = true;
foreach ($chunks as $chunk)
{
// Not well-formed utf8 data?
if (!preg_match('/^./u', base64_decode($chunk)))
{
$correct_encode = false;
// Always odd length
$split_length -= 2;
}
}
}
if (!$correct_encode)
{
// Not RFC-compliant, but working with all setups
return $start . $encoded_str . $end;
}
return $start . implode($spacer, $chunks) . $end;
}
?>