- Performance improvements

program/include/rcube_imap.php

@@ -2416,10 +2416,12 @@ class rcube_imap
 
         // convert charset (if text or message part)
         if ($body && preg_match('/^(text|message)$/', $o_part->ctype_primary)) {
-            // Remove NULL characters (#1486189)
-            $body = str_replace("\x00", '', $body);
+            // Remove NULL characters if any (#1486189)
+            if (strpos($body, "\x00") !== false) {
+                $body = str_replace("\x00", '', $body);
+            }
 
-           if (!$skip_charset_conv) {
+            if (!$skip_charset_conv) {
                 if (!$o_part->charset || strtoupper($o_part->charset) == 'US-ASCII') {
                     // try to extract charset information from HTML meta tag (#1488125)
                     if ($o_part->ctype_secondary == 'html' && preg_match('/<meta[^>]+charset=([a-z0-9-_]+)/i', $body, $m))

program/include/rcube_template.php

@@ -434,7 +434,11 @@ class rcube_template extends rcube_html_page
         // trigger generic hook where plugins can put additional content to the page
         $hook = $this->app->plugins->exec_hook("render_page", array('template' => $realname, 'content' => $output));
 
-        $output = $this->parse_with_globals($hook['content']);
+        // save some memory
+        $output = $hook['content'];
+        unset($hook['content']);
+
+        $output = $this->parse_with_globals($output);
 
         // make sure all <form> tags have a valid request token
         $output = preg_replace_callback('/<form\s+([^>]+)>/Ui', array($this, 'alter_form_tag'), $output);

program/steps/mail/func.inc

@@ -1092,20 +1092,18 @@ function rcmail_resolve_base($body)
 function rcmail_html4inline($body, $container_id, $body_id='', &$attributes=null)
 {
   $last_style_pos = 0;
-  $body_lc = strtolower($body);
   $cont_id = $container_id.($body_id ? ' div.'.$body_id : '');
 
   // find STYLE tags
-  while (($pos = strpos($body_lc, '<style', $last_style_pos)) && ($pos2 = strpos($body_lc, '</style>', $pos)))
+  while (($pos = stripos($body, '<style', $last_style_pos)) && ($pos2 = stripos($body, '</style>', $pos)))
   {
-    $pos = strpos($body_lc, '>', $pos)+1;
+    $pos = strpos($body, '>', $pos)+1;
 
     // replace all css definitions with #container [def]
     $styles = rcmail_mod_css_styles(
       substr($body, $pos, $pos2-$pos), $cont_id);
 
-    $body = substr($body, 0, $pos) . $styles . substr($body, $pos2);
-    $body_lc = strtolower($body);
+    $body = substr_replace($body, $styles, $pos, $pos2-$pos);
     $last_style_pos = $pos2;
   }