Merge branch 'prototype' of github.com:LLK/scratchx into gh-pages

Conflicts:
	index.html

index.html

@@ -205,6 +205,7 @@
     </div>
     <div class="scratch_loading"></div>
 </section>
+<script type="text/javascript" src="libs/base64ab.js"></script>
 <script type="text/javascript" src="scratch_extensions/scratch_ext.js"></script>
 <script type="text/javascript" src="js/scratchx.js"></script>
 </body>

libs/base64ab.js

@@ -0,0 +1,47 @@
+// Convert ArrayBuffers to/from Base64
+
+(function() {
+    var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+
+    window.ab_to_b64 = function (arraybuffer) {
+        var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';
+
+        for (i = 0; i < len; i += 3) {
+            base64 += chars[bytes[i] >> 2];
+            base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
+            base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
+            base64 += chars[bytes[i + 2] & 63];
+        }
+
+        if ((len % 3) === 2) {
+            base64 = base64.substring(0, base64.length - 1) + '=';
+        } else if (len % 3 === 1) {
+            base64 = base64.substring(0, base64.length - 2) + '==';
+        }
+
+        return base64;
+    }
+
+    window.b64_to_ab = function (base64) {
+        var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;
+        if (base64[base64.length - 1] === '=') {
+            --bufferLength;
+            if (base64[base64.length - 2] === '=') {
+                --bufferLength;
+            }
+        }
+
+        var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);
+        for (i = 0; i < len; i += 4) {
+            encoded1 = chars.indexOf(base64[i]);
+            encoded2 = chars.indexOf(base64[i + 1]);
+            encoded3 = chars.indexOf(base64[i + 2]);
+            encoded4 = chars.indexOf(base64[i + 3]);
+            bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
+            bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
+            bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
+        }
+
+        return arraybuffer;
+    }
+})();