/**
* The MIME:: class provides methods for dealing with MIME standards.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @version $Revision: 1.64 $
* @since Horde 1.3
* @package horde.mime
*/
class MIME {
/**
* Determine if a string contains 8-bit characters.
* @access private
*
* @param string $string The string to check.
* @return boolean true if it does, false if it doesn''t.
*/
function is8bit($string)
{
if (is_string($string)) {
for ($i = 0; $i < strlen($string); $i++) {
if (ord($string[$i]) >> 7)
return true;
}
return false;
}
return false;
}
/**
* Encode a string containing non-ascii characters according to RFC 2047.
*
* @param string $text The text to encode.
* @param string $charset (optional) The character set of the text.
* @param boolean $outer Is this the final iteration?
*
* @return string The text, encoded only if it contains non-ascii characters.
*/
function encode($text, $charset = null, $outer = true)
{
if (MIME::is8bit($text)) {
if (((strlen($text) * 3) + strlen($charset) + 7) > 76) {
$text = MIME::encode(substr($text, 0, (23 - strlen($charset))), $charset) . MIME::encode(substr($text, (23 - strlen($charset))), $charset, false);
} else {
$text = "=?$charset?B?" . strtr(trim(base64_encode($text)), '' '', ''_'') . "?=\n\t";
}
}
// if this is the final iteration, take off any trailing
// newline/tab chars.
if ($outer && (substr($text, -2) == "\n\t"))
$text = substr($text, 0, -2);
return $text;
}
/**
* Encode a string containing email addresses according to RFC 2047.
*
* This differs from MIME::encode() because it keeps email
* addresses legal, only encoding the personal information.
*
* @param string $text The email addresses to encode.
* @param string $charset (optional) The character set of the text.
* @param string $defserver (optional) The default domain to append to mailboxes.
*
* @return string The text, encoded only if it contains non-ascii characters.
*/
function encodeAddress($text, $charset = null, $defserver = null)
{
include_once ''Mail/RFC822.php'';
/**
* Decode an RFC 2047-encoded string.
*
* @param string $string The text to decode.
* @return string The decoded text, or the original string if it was not encoded.
*/
function decode($string)
{
$pos = strpos($string, ''=?'');
if ($pos === false) {
return $string;
}
// take out any spaces between multiple encoded words
$string = preg_replace(''|\?=\s=\?|'', ''?==?'', $string);
$preceding = substr($string, 0, $pos); // save any preceding text
$search = substr($string, $pos + 2, 75); // the mime header spec says this is the longest a single encoded word can be
$d1 = strpos($search, ''?'');
if (!is_int($d1)) {
return $string;
}
/**
* If an email address has no personal information, get rid of any
* angle brackets (<>) around it.
*
* @param string $address The address to trim.
* @return string The trimmed address.
*/
function trimEmailAddress($address)
{
$address = trim($address);
if ((substr($address, 0, 1) == ''<'') && (substr($address, -1) == ''>'')) {
$address = substr($address, 1, -1);
}
return $address;
}