/**
* Converts charset of search criteria string
*
* @param string $str Search string
* @param string $charset Original charset
* @param string $dest_charset Destination charset (default US-ASCII)
*
* @return string Search string
*/
public static function convert_criteria($str, $charset, $dest_charset = 'US-ASCII')
{
// convert strings to US_ASCII
if (preg_match_all('/\\{([0-9]+)\\}\\r\\n/', $str, $matches, PREG_OFFSET_CAPTURE)) {
$last = 0;
$res = '';
foreach ($matches[1] as $m) {
$string_offset = $m[1] + strlen($m[0]) + 4;
// {}\r\n
$string = substr($str, $string_offset - 1, $m[0]);
$string = rcube_charset::convert($string, $charset, $dest_charset);
if ($string === false || !strlen($string)) {
continue;
}
$res .= substr($str, $last, $m[1] - $last - 1) . rcube_imap_generic::escape($string);
$last = $m[0] + $string_offset - 1;
}
if ($last < strlen($str)) {
$res .= substr($str, $last, strlen($str) - $last);
}
} else {
$res = $str;
}
return $res;
}
