diff options
Diffstat (limited to 'program/include/rcube_imap.php')
| -rw-r--r-- | program/include/rcube_imap.php | 125 |
1 files changed, 70 insertions, 55 deletions
diff --git a/program/include/rcube_imap.php b/program/include/rcube_imap.php index dd821bf37..adca4e3d4 100644 --- a/program/include/rcube_imap.php +++ b/program/include/rcube_imap.php @@ -4344,80 +4344,95 @@ class rcube_imap */ public static function decode_mime_string($input, $fallback=null) { - // Initialize variable - $out = ''; + if (!empty($fallback)) { + $default_charset = $fallback; + } + else { + $default_charset = rcmail::get_instance()->config->get('default_charset', 'ISO-8859-1'); + } - // Iterate instead of recursing, this way if there are too many values we don't have stack overflows // rfc: all line breaks or other characters not found // in the Base64 Alphabet must be ignored by decoding software // delete all blanks between MIME-lines, differently we can // receive unnecessary blanks and broken utf-8 symbols $input = preg_replace("/\?=\s+=\?/", '?==?', $input); - // Check if there is stuff to decode - if (strpos($input, '=?') !== false) { - // Loop through the string to decode all occurences of =? ?= into the variable $out - while(($pos = strpos($input, '=?')) !== false) { - // Append everything that is before the text to be decoded - $out .= substr($input, 0, $pos); - - // Get the location of the text to decode - $end_cs_pos = strpos($input, "?", $pos+2); - $end_en_pos = strpos($input, "?", $end_cs_pos+1); - $end_pos = strpos($input, "?=", $end_en_pos+1); + // encoded-word regexp + $re = '/=\?([^?]+)\?([BbQq])\?([^?\n]*)\?=/'; - // Extract the encoded string - $encstr = substr($input, $pos+2, ($end_pos-$pos-2)); - // Extract the remaining string - $input = substr($input, $end_pos+2); + // Find all RFC2047's encoded words + if (preg_match_all($re, $input, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) { + // Initialize variables + $tmp = array(); + $out = ''; + $start = 0; - // Decode the string fragement - $out .= rcube_imap::_decode_mime_string_part($encstr); - } + foreach ($matches as $idx => $m) { + $pos = $m[0][1]; + $charset = $m[1][0]; + $encoding = $m[2][0]; + $text = $m[3][0]; + $length = strlen($m[0][0]); - // Deocde the rest (if any) - if (strlen($input) != 0) - $out .= rcube_imap::decode_mime_string($input, $fallback); + // Append everything that is before the text to be decoded + if ($start != $pos) { + $substr = substr($input, $start, $pos-$start); + $out .= rcube_charset_convert($substr, $default_charset); + $start = $pos; + } + $start += $length; + + // Per RFC2047, each string part "MUST represent an integral number + // of characters . A multi-octet character may not be split across + // adjacent encoded-words." However, some mailers break this, so we + // try to handle characters spanned across parts anyway by iterating + // through and aggregating sequential encoded parts with the same + // character set and encoding, then perform the decoding on the + // aggregation as a whole. + + $tmp[] = $text; + if ($next_match = $matches[$idx+1]) { + if ($next_match[0][1] == $start + && $next_match[1][0] == $charset + && $next_match[2][0] == $encoding + ) { + continue; + } + } - // return the results - return $out; - } - - // no encoding information, use fallback - return rcube_charset_convert($input, - !empty($fallback) ? $fallback : rcmail::get_instance()->config->get('default_charset', 'ISO-8859-1')); - } + $count = count($tmp); + $text = ''; + // Decode and join encoded-word's chunks + if ($encoding == 'B' || $encoding == 'b') { + // base64 must be decoded a segment at a time + for ($i=0; $i<$count; $i++) + $text .= base64_decode($tmp[$i]); + } + else { //if ($encoding == 'Q' || $encoding == 'q') { + // quoted printable can be combined and processed at once + for ($i=0; $i<$count; $i++) + $text .= $tmp[$i]; - /** - * Decode a part of a mime-encoded string - * - * @param string $str String to decode - * @return string Decoded string - * @access private - */ - private function _decode_mime_string_part($str) - { - $a = explode('?', $str); - $count = count($a); + $text = str_replace('_', ' ', $text); + $text = quoted_printable_decode($text); + } - // should be in format "charset?encoding?base64_string" - if ($count >= 3) { - for ($i=2; $i<$count; $i++) - $rest .= $a[$i]; + $out .= rcube_charset_convert($text, $charset); + $tmp = array(); + } - if (($a[1]=='B') || ($a[1]=='b')) - $rest = base64_decode($rest); - else if (($a[1]=='Q') || ($a[1]=='q')) { - $rest = str_replace('_', ' ', $rest); - $rest = quoted_printable_decode($rest); + // add the last part of the input string + if ($start != strlen($input)) { + $out .= rcube_charset_convert(substr($input, $start), $default_charset); } - return rcube_charset_convert($rest, $a[0]); + // return the results + return $out; } - // we dont' know what to do with this - return $str; + // no encoding information, use fallback + return rcube_charset_convert($input, $default_charset); } |