Okay, that is pretty raw, but better to have it in place than trying to play catch-up. Introducing an early stage of CAPTCHA modules.

git-svn-id: file:///svn/phpbb/trunk@8889 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/captcha/plugins/phpbb_captcha_nogd_plugin.php

@@ -0,0 +1,58 @@
+<?
+/**
+*
+* @package VC
+* @version $Id: $
+* @copyright (c) 2006 2008 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+include_once(PHPBB_ROOT_PATH . "includes/captcha/plugins/captcha_abstract." . PHP_EXT);
+
+class phpbb_captcha_nogd extends phpbb_default_captcha implements phpbb_captcha_plugin
+{
+
+	function __construct()
+	{
+		include_once(PHPBB_ROOT_PATH . "includes/captcha/captcha_non_gd." . PHP_EXT);
+	}
+	
+	public static function get_instance()
+	{
+		return new phpbb_captcha_nogd();
+	}
+
+	static function is_available()
+	{
+		return true;
+	}
+	
+	static function get_name()
+	{
+		global $user;
+		
+		return 'CAPTCHA_NO_GD'; 
+	}
+	
+	static function get_class_name()
+	{
+		return 'phpbb_captcha_nogd';
+	}
+	
+	
+	function acp_page($id, &$module)
+	{
+		global $user;
+		
+		trigger_error($user->lang['CAPTCHA_NO_OPTIONS'] . adm_back_link($module->u_action));
+	}
+}
+