Adding size limit to signature. Max size is the same as db BLOB size.

ChangeLog

@@ -77,6 +77,9 @@ Version 1.5.1 -- CVS
     reply focus to "No focus" also affects composing new messages)
   - Current hook name is now globally available when running a hook ($currentHookName)
   - Fix bug when Saving to Draft folder that contains special characters.
+  - Added size limit to signatures saved in file backend. Created error_option_save
+    function, that allows sending error message to options page. Thanks to Martynas 
+    Bieliauskas for spotting big signature "option".
 
 Version 1.5.0
 --------------------

functions/display_messages.php

@@ -163,5 +163,18 @@ function error_box($string, $color) {
          '</td></tr></table></td></tr></table>';
 }
 
+/**
+ * Adds message that informs about non fatal error that can happen while saving preferences
+ * @param string $message error message
+ * @since 1.5.1
+ */
+function error_option_save($message) {
+    global $optpage_save_error;
+
+    if (! is_array($optpage_save_error) )
+	$optpage_save_error=array();
+
+    $optpage_save_error=array_merge($optpage_save_error,array($message));
+}
 // vim: et ts=4
 ?>

functions/file_prefs.php

@@ -223,6 +223,11 @@ function checkForPrefs($data_dir, $username, $filename = '') {
  * Write the User Signature.
  */
 function setSig($data_dir, $username, $number, $value) {
+    // Limit signature size to 64KB (database BLOB limit)
+    if (strlen($value)>65536) {
+        error_option_save(_("Signature is too big."));
+        return;
+    }
     $filename = getHashedFile($username, $data_dir, "$username.si$number");
     /* Open the file for writing, or else display an error to the user. */
     if(!$file = @fopen("$filename.tmp", 'w')) {

src/options.php

@@ -210,6 +210,8 @@ if ( !@is_file( $optpage_file ) ) {
 /*** Next, process anything that needs to be processed. ***/
 /***********************************************************/
 
+$optpage_save_error=array();
+
 if ( isset( $optpage_data ) ) {
     switch ($optmode) {
         case SMOPT_MODE_SUBMIT:
@@ -289,8 +291,19 @@ if ($optpage == SMOPT_PAGE_MAIN) {
         if (!isset($frame_top)) {
             $frame_top = '_top';
         }
-        /* Display a message indicating a successful save. */
-        echo '<b>' . _("Successfully Saved Options") . ": $optpage_name</b><br>\n";
+
+        if (isset($optpage_save_error) && $optpage_save_error!=array()) {
+            echo "<font color=\"$color[2]\"><b>" . _("Error(s) happened while saving your options") . "</b></font><br />\n";
+            echo "<ul>\n";
+            foreach ($optpage_save_error as $error_message) {
+                echo '<li><small>' . $error_message . "</small></li>\n";
+            }
+            echo "</ul>\n";
+            echo '<b>' . _("Some of your preference changes are not applied.") . "</b><br />\n";
+        } else {
+            /* Display a message indicating a successful save. */
+            echo '<b>' . _("Successfully Saved Options") . ": $optpage_name</b><br>\n";
+        }
 
         /* If $max_refresh != SMOPT_REFRESH_NONE, provide a refresh link. */
         if ( !isset( $max_refresh ) ) {