From d7e920c6b66b58573dcd6aa3eef89c3dc383585f Mon Sep 17 00:00:00 2001
From: Haotong Lin <lofanmi@gmail.com>
Date: Mon, 7 Dec 2015 20:48:25 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9EBase64=E7=BC=96(=E8=A7=A3)?=
 =?UTF-8?q?=E7=A0=81=E9=A9=B1=E5=8A=A8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 library/org/transform/driver/base64.php | 87 +++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 library/org/transform/driver/base64.php

diff --git a/library/org/transform/driver/base64.php b/library/org/transform/driver/base64.php
new file mode 100644
index 00000000..e1cf6c60
--- /dev/null
+++ b/library/org/transform/driver/base64.php
@@ -0,0 +1,87 @@
+<?php
+// +----------------------------------------------------------------------
+// | TOPThink [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2011 http://topthink.com All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: Haotong Lin<lofanmi@gmail.com>
+// +----------------------------------------------------------------------
+
+namespace org\transform\driver;
+
+/**
+ * Base64编码实现
+ * 
+ */
+class Base64
+{
+    /**
+     * @access public
+     * @static 编解码目标
+     *     default: 原始的编(解)码
+     *     url    : URL友好的编(解)码
+     *     regex  : 正则表达式友好的编(解)码
+     */
+    public static $target = 'default';
+
+    /**
+     * Base64编码函数
+     *
+     * @param string $data   欲编码的数据
+     * @param string $target 编码目标
+     */
+    public function encode($data, $target = '')
+    {
+        // 当函数没有特别指定编码目标时, 使用类自身编码目标
+        if (empty($target)) {
+            $target = self::$target;
+        }
+        // 进行一次原始编码
+        $data = base64_encode($data);
+        // 根据编码目标替换字符
+        switch ($target) {
+            case 'url':
+                $data = str_replace(['+', '/', '='], ['-', '_', ''], $data);
+                break;
+            case 'regex':
+                $data = str_replace(['+', '/', '='], ['!', '-', ''], $data);
+                break;
+            case 'default':
+            default:
+                break;
+        }
+        // 返回编码结果
+        return $data;
+    }
+
+    /**
+     * Base64解码函数
+     *
+     * @param string $data   欲解码的数据
+     * @param string $target 解码目标
+     */
+    public function decode($data, $target = '')
+    {
+        // 当函数没有特别指定解码目标时, 使用类自身解码目标
+        if (empty($target)) {
+            $target = self::$target;
+        }
+        // 根据解码目标替换字符
+        switch ($target) {
+            case 'url':
+                $data = str_replace(['-', '_'], ['+', '/'], $data);
+                break;
+            case 'regex':
+                $data = str_replace(['!', '-'], ['+', '/'], $data);
+                break;
+            case 'default':
+            default:
+                break;
+        }
+        // 原始解码，并返回结果
+        return base64_decode($data);
+    }
+
+}