From 1e474350588046ed0378c068e1cfeb083e09db4a Mon Sep 17 00:00:00 2001
From: rolux <rolux@rolux.org>
Date: Fri, 15 Jun 2012 10:39:22 +0200
Subject: [PATCH] add atob and btoa polyfills

---
 source/Ox/js/Polyfill.js | 44 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/source/Ox/js/Polyfill.js b/source/Ox/js/Polyfill.js
index 65a3fbbb..2f01105a 100644
--- a/source/Ox/js/Polyfill.js
+++ b/source/Ox/js/Polyfill.js
@@ -2,6 +2,47 @@
 
 Ox.polyfill = {};
 
+(function() {
+    var digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+    /*@
+    Ox.polyfill.atob <f> see https://developer.mozilla.org/en/DOM/window.atob
+        > Ox.polyfill.atob('Cg==')
+        '\n'
+        > Ox.polyfill.atob('Zm9v')
+        'foo'
+    @*/
+    Ox.polyfill.atob = function(string) {
+        var binary = '', ret = '';
+        String(string).replace(/=/g, '').split('').forEach(function(char) {
+            binary += Ox.pad(digits.indexOf(char).toString(2), 'left', 6, '0');
+        });
+        while (binary.length >= 8) {
+            ret += Ox.char(parseInt(binary.slice(0, 8), 2));
+            binary = binary.slice(8);
+        }
+        return ret;
+    };
+    /*@
+    Ox.polyfill.btoa <f> see https://developer.mozilla.org/en/DOM/window.btoa
+        > Ox.polyfill.btoa('\n')
+        'Cg=='
+        > Ox.polyfill.btoa('foo')
+        'Zm9v'
+    @*/
+    Ox.polyfill.btoa = function(string) {
+        var binary = '', ret = '';
+        String(string).split('').forEach(function(char) {
+            binary += Ox.pad(char.charCodeAt(0).toString(2), 'left', 8, '0');
+        });
+        binary = Ox.pad(binary, Math.ceil(binary.length / 6) * 6, '0')
+        while (binary) {
+            ret += digits[parseInt(binary.slice(0, 6), 2)];
+            binary = binary.slice(6);
+        }
+        return Ox.pad(ret, Math.ceil(ret.length / 4) * 4, '=');
+    };
+}());
+
 (function(window) {
     /*@
     Ox.polyfill.bind <f> see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
@@ -343,7 +384,8 @@ Ox.polyfill.trim = function() {
     for (key in Ox.polyfill) {
         object = key == 'bind' ? Function.prototype
             : key == 'isArray' ? Array
-            : key == 'JSON' || key == 'localStorage' ? window
+            : key == 'atob' || key == 'btoa'
+                || key == 'JSON' || key == 'localStorage' ? window
             : key == 'keys' ? Object
             : key == 'trim' ? String.prototype
             : Array.prototype;