fix imap_mailboxmsginfo

Author: francescobianco

src/BodyStructure.php

@@ -328,7 +328,7 @@ protected static function extractSubPartFromMessage($itemPart)
         $parameters = self::extractParameters($itemPart[2], []);
 
         $type = 0;
-        if ($itemPart[0] == 'APPLICATION') {
+        if (isset($itemPart[0]) && $itemPart[0] == 'APPLICATION') {
             $type = 3;
         }
 

src/HeaderInfo.php

@@ -94,7 +94,7 @@ protected static function parseAddressList($address, $defaultHost)
             $addressEntry = (object) [
                 'personal' => $objectEntry->personal ?? null,
                 'mailbox' => $objectEntry->mailbox,
-                'host' => $objectEntry->host,
+                'host' => @$objectEntry->host,
             ];
 
             if (empty($addressEntry->personal)) {

src/Roundcube/Charset.php

@@ -225,7 +225,7 @@ public static function parse_charset($input)
         }
         // UTF
         else if (preg_match('/U[A-Z][A-Z](7|8|16|32)(BE|LE)*/', $str, $m)) {
-            $result = 'UTF-' . $m[1] . $m[2];
+            $result = 'UTF-' . $m[1] . @$m[2];
         }
         // ISO-8859
         else if (preg_match('/ISO8859([0-9]{0,2})/', $str, $m)) {

src/Roundcube/ImapClient.php

@@ -2319,7 +2319,7 @@ protected function modFlag($mailbox, $messages, $flag, $mod = '+')
             return false;
         }
 
-        if ($this->flags[strtoupper($flag)]) {
+        if (isset($this->flags[strtoupper($flag)]) && $this->flags[strtoupper($flag)]) {
             $flag = $this->flags[strtoupper($flag)];
         }
 

src/Roundcube/ResultThread.php

@@ -116,7 +116,7 @@ public function is_empty()
      */
     public function count()
     {
-        if ($this->meta['count'] !== null)
+        if (isset($this->meta['count']) && $this->meta['count'] !== null)
             return $this->meta['count'];
 
         if (empty($this->raw_data)) {