Fixed issue 6.

Author: killme2008

lib/av.js

@@ -3824,7 +3824,46 @@
     return chunks.join("");
   };
 
+  //https://raw.githubusercontent.com/kvz/phpjs/master/functions/url/base64_decode.js
+  var decodeBase64 = function(data) {
+    var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+    var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,
+        ac = 0,
+        dec = '',
+        tmp_arr = [];
 
+    if (!data) {
+        return data;
+    }
+
+    data += '';
+
+    do {
+        // unpack four hexets into three octets using index points in b64
+        h1 = b64.indexOf(data.charAt(i++));
+        h2 = b64.indexOf(data.charAt(i++));
+        h3 = b64.indexOf(data.charAt(i++));
+        h4 = b64.indexOf(data.charAt(i++));
+
+        bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
+
+        o1 = bits >> 16 & 0xff;
+        o2 = bits >> 8 & 0xff;
+        o3 = bits & 0xff;
+
+        if (h3 == 64) {
+            tmp_arr[ac++] = String.fromCharCode(o1);
+        } else if (h4 == 64) {
+            tmp_arr[ac++] = String.fromCharCode(o1, o2);
+        } else {
+            tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
+        }
+    } while (i < data.length);
+
+    dec = tmp_arr.join('');
+
+    return decodeURIComponent(escape(dec.replace(/\0+$/, '')));
+  };
   // A list of file extensions to mime types as found here:
   // http://stackoverflow.com/questions/58510/using-net-how-can-you-find-the-
   //     mime-type-of-a-file-based-on-the-file-signature
@@ -4108,7 +4147,7 @@
       this._metaData.size = data.length;
     } else if (data && data.base64) {
       this._source = AV.Promise.as(data.base64, guessedType);
-      this._metaData.size = data.base64.length;
+      this._metaData.size = decodeBase64(data.base64).length;
     } else if (typeof(File) !== "undefined" && data instanceof File) {
       this._source = readAsync(data, type);
     } else if(AV._isNode && Buffer.isBuffer(data)) {
@@ -4271,7 +4310,7 @@
               self._qiniu_key = key;
               self._base64 = base64;
               if(!self._metaData.size){
-                self._metaData.size = base64.length;
+                self._metaData.size = decodeBase64(base64).length;
               }
               return AV._request("qiniu", null, null, 'POST', data);
             }).then(function(response) {
@@ -4308,14 +4347,15 @@
                 metaData: self._metaData,
               };
               if(!self._metaData.size){
-                self._metaData.size = base64.length;
+                self._metaData.size = decodeBase64(base64).length;
               }
               return AV._request("files", self._name, null, 'POST', data);
             }).then(function(response) {
               self._name = response.name;
               self._url = response.url;
               self.id = response.objectId;
-              self._metaData.size = response.size;
+              if(response.size)
+                self._metaData.size = response.size;
               return self;
             });
           }
@@ -4330,7 +4370,8 @@
             self._name = response.name;
             self._url = response.url;
             self.id = response.objectId;
-            self._metaData.size = response.size;
+             if(response.size)
+                self._metaData.size = response.size;
             return self;
           });
         }