include/playback.js: support binary (non-base64) data files.

Data files should now set the variable VNC_frame_encoding to either
"binary" or "base64". The python websockify recording mode adds this
automatically based on what is negotiated with the client being
recorded.

include/playback.js

@@ -79,10 +79,22 @@ queue_next_packet = function () {
     }
 };
 
+var bytes_processed = 0;
+
 do_packet = function () {
     //Util.Debug("Processing frame: " + frame_idx);
-    var frame = VNC_frame_data[frame_idx];
-    rfb.recv_message({'data' : frame.slice(frame.indexOf('{', 1) + 1)});
+    var frame = VNC_frame_data[frame_idx],
+        start = frame.indexOf('{', 1) + 1;
+    bytes_processed += frame.length - start;
+    if (VNC_frame_encoding === 'binary') {
+        var u8 = new Uint8Array(frame.length - start);
+        for (var i = 0; i < frame.length - start; i++) {
+            u8[i] = frame.charCodeAt(start + i);
+        }
+        rfb.recv_message({'data' : u8});
+    } else {
+        rfb.recv_message({'data' : frame.slice(start)});
+    }
     frame_idx += 1;
 
     queue_next_packet();