/**
* byte oriented line folding fix
*
* remove any line-endings that may include spaces or tabs
* and convert all line endings (iCal default '\r\n'),
* takes care of '\r\n', '\r' and '\n' and mixed '\r\n'+'\r', '\r\n'+'\n'
*
* @author Kjell-Inge Gustafsson, kigkonsult <*****@*****.**>
* @since 2.18.16 - 2014-04-04
* @param string $text
* @param string $nl
* @return string
*/
public static function convEolChar(&$text, $nl)
{
/* fix dummy line separator */
if (empty(iCalUtilityFunctions::$baseDelim)) {
iCalUtilityFunctions::$baseDelim = substr(microtime(), 2, 4);
$base = 'aAbB!cCdD"eEfF#gGhHiIjJ%kKlL&mMnN/oOpP(rRsS)tTuU=vVxX?uUvV*wWzZ-1234_5678|90';
$len = strlen($base) - 1;
for ($p = 0; $p < 6; $p++) {
iCalUtilityFunctions::$baseDelim .= $base[mt_rand(0, $len)];
}
}
/* fix eol chars */
$text = str_replace(array("\r\n", "\n\r", "\n", "\r"), iCalUtilityFunctions::$baseDelim, $text);
/* fix empty lines */
$text = str_replace(iCalUtilityFunctions::$baseDelim . iCalUtilityFunctions::$baseDelim, iCalUtilityFunctions::$baseDelim . str_pad('', 75) . iCalUtilityFunctions::$baseDelim, $text);
/* fix line folding */
$text = str_replace(iCalUtilityFunctions::$baseDelim, $nl, $text);
$text = str_replace(array($nl . ' ', $nl . "\t"), '', $text);
/* split in component/property lines */
$text = explode($nl, $text);
return $text;
}
