Refresh kohana from upstream svn trunk r3771.

During this process, remove a considerable number of files from kohana
that we will not be needing in Gallery3, including the following files
and directories:
    kohana/application
    kohana/example.htaccess
    kohana/index.php
    kohana/install.php
    kohana/kohana.png
    kohana/modules/archive
    kohana/modules/auth
    kohana/modules/flot
    kohana/modules/gmaps
    kohana/modules/kodoc
    kohana/modules/payment
    kohana/modules/smarty
    kohana/modules/unit_test/i18n
    kohana/modules/unit_test/tests/Example_Test.php
    kohana/modules/unit_test/tests/Valid_Test.php
    kohana/system/config/captcha.php
    kohana/system/controllers/captcha.php
    kohana/system/fonts
    kohana/system/i18n
    kohana/system/libraries/Calendar.php
    kohana/system/libraries/Calendar_Event.php
    kohana/system/libraries/Captcha.php
    kohana/system/libraries/Tagcloud.php
    kohana/system/vendor
    kohana/system/views/pagination
    kohana/system/views/kohana_calendar.php

1 files changed, 61 insertions, 0 deletions

diff --git a/kohana/libraries/drivers/Captcha/Math.php b/kohana/libraries/drivers/Captcha/Math.php
new file mode 100644
index 00000000..76dda8e9
--- /dev/null
+++ b/kohana/libraries/drivers/Captcha/Math.php
@@ -0,0 +1,61 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Captcha driver for "math" style.
+ *
+ * $Id$
+ *
+ * @package    Captcha
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class Captcha_Math_Driver extends Captcha_Driver {
+
+	private $math_exercice;
+
+	/**
+	 * Generates a new Captcha challenge.
+	 *
+	 * @return  string  the challenge answer
+	 */
+	public function generate_challenge()
+	{
+		// Easy
+		if (Captcha::$config['complexity'] < 4)
+		{
+			$numbers[] = mt_rand(1, 5);
+			$numbers[] = mt_rand(1, 4);
+		}
+		// Normal
+		elseif (Captcha::$config['complexity'] < 7)
+		{
+			$numbers[] = mt_rand(10, 20);
+			$numbers[] = mt_rand(1, 10);
+		}
+		// Difficult, well, not really ;)
+		else
+		{
+			$numbers[] = mt_rand(100, 200);
+			$numbers[] = mt_rand(10, 20);
+			$numbers[] = mt_rand(1, 10);
+		}
+
+		// Store the question for output
+		$this->math_exercice = implode(' + ', $numbers).' = ';
+
+		// Return the answer
+		return array_sum($numbers);
+	}
+
+	/**
+	 * Outputs the Captcha riddle.
+	 *
+	 * @param   boolean  html output
+	 * @return  mixed
+	 */
+	public function render($html)
+	{
+		return $this->math_exercice;
+	}
+
+} // End Captcha Math Driver Class
\ No newline at end of file