The rfb variable wasn't available at the point settingsDisabled() was
being called since it was called inline with RFB() initialization. To
solve this we pass the updateState rfb variable so that the canvas can
be queried for setting the cursor_uri value.

Preparation for online demo.

Split general playback code into tests/playback.js.

Use timestamps from recording with proxy to playback in realtime.

Apparently the virtualbox VNC server send the size and then the
security type list in separate frames so we need to wait for the full
list.

When the documement/window is scrolled, the onMouseDisable routine was
not properly calculating the position to test whether to ignore the
event or not.

Change RQ and SQ vars to rQ and sQ since caps at the start implies
a classable entity.

This is logical now since the external update callback can be provided
when the object is created so we don't need a separate init function.

It's less efficient on average that base64 (150% vs 133%). It's
non-standard (0 shifted to 256 before encoding). And I rarely use it.

Turned out not to be useful (pretty much never looked at the info once
I added it). The playback test is much more useful for measuring
performance.

getCLength was not using the index (RQi) into the receive queue.

Generally, most servers send hextile updates as single updates
containing many rects. Some servers send hextile updates as many small
framebuffer updates with a few rects each (such as QEMU). This latter
cases revealed that shifting off the beginning of the receive queue
(which happens after each hextile FBU) performs poorly.

This change switches to using an indexed receive queue (instead of
actually shifting off the array). When the receive queue has grown to
a certain size, then it is compacted all at once.

The code is not as clean, but this change results in more than 2X
speedup under Chrome for the pessimal case and 10-20% in firefox.

- This allows the recorded data to be immediately usable by
  tests/vnc_playback.html

Apparently there are versions of UltraVNC that report version 3.6.
This is not a legal version according to the spec, but we'll just
force version 3.3 if we receive it. Thanks to Larry Rowe for the info.

Turns out when Windows is running in QEMU and a window scroll happens,
there are lots of little hextile rects sent. This is slow in noVNC.

- Some recording/playback improvement.
- Add test harness to drive playback of recordings.
- By pulling off the rect header in one chunk we get a 3X speedup in
  Chrome and a 20% speedup in firefox (specifically for the scroll
  test).
- Also, get rid of some noise from creating timers for handle_message.
  Check to make sure there isn't already a pending timer first.

(cherry picked from commit 11f3271a52505dccbf38bea422e7c9a79dddd478)
Signed-off-by: Joel Martin <github@martintribe.org>

This is very usefull when you need to open a new window (with a new document) from javascript,
without having to reload the script.js.
(cherry picked from commit 8ded53c1de06d01e50d58543c19e73926f0fbbd4)
Signed-off-by: Joel Martin <github@martintribe.org>

- Fallback to md5 module if hashlib not there.
- Import parse_qsl from cgi where it is in both 2.4 and 2.6

- Replace URL parsing using "".partition() with urlparse module.

- When a packet with only '\xff\x00' is received, this means the
  client is doing an orderly shutdown. (WebSockets spec version 76)

New API:

To use the RFB object, you now must instantiate it (this allows more
than one instance of it on the same page).

    rfb = new RFB(settings);

The 'settings' variable is a namespace that contains initial default
settings. These can also be set and read using 'rfb.set_FOO()' and
'rfb.get_FOO()' where FOO is the setting name. The current settings
are (and defaults) are:
    - target: the DOM Canvas element to use ('VNC_canvas').
    - encrypt: whether to encrypt the connection (false)
    - true_color: true_color or palette (true)
    - b64encode: base64 encode the WebSockets data (true)
    - local_cursor: use local cursor rendering (true if supported)
    - connectTimeout: milliseconds to wait for connect (2000)
    - updateState: callback when RFB state changes (none)
    - clipboardReceive: callback when clipboard data received (none)

The parameters to the updateState callback have also changed. The
function spec is now updateState(rfb, state, oldstate, msg):
    - rfb: the RFB object that this state change is for.
    - state: the new state
    - oldstate: the previous state
    - msg: a message associate with the state (not always set).

The clipboardReceive spec is clipboardReceive(rfb, text):
    - rfb: the RFB object that this text is from.
    - text: the clipboard text received.

Changes:

- The RFB and Canvas namespaces are now more proper objects. Private
  implementation is no longer exposed and the public API has been made
  explicit. Also, instantiation allows more than one VNC connection
  on the same page (to complete this, DefaultControls will also need
  this same refactoring).

- Added 'none' logging level.

- Removed automatic stylesheet selection workaround in util.js and
  move it to defaultcontrols so that it doesn't interfere with
  intergration.

- Also, some major JSLinting.

- Fix input, canvas, and cursor tests to work with new model.

If cursor Data URI scheme detection threw an exception, it would cause
canvas initialization to fail. cursor detection exceptions should just
disable local cursor change support, not cause canvas init to fail.

Uses the CSS "scale()" operation. The main problem is that the DOM
container is not rescaled, only the size of the displayed content
within it so there will need to be some sort of mechanism to handle
this better so other elements reflow to the new size. Or it might just
not work and be removed later. The zoom property seems to do the right
behavior, but it's not widely supported. Worth exploring though.

After each complete framebufferUpdate, set a short timer to continue
processing the receive queue. This gives other events a chance to
fire. Especially important when noVNC is integrated into another
website.

It points to the include sub-directory, not to the directory above.

noVNC was never processing more than one framebufferUpdate message per
onmessage event. If noVNC receives an incomplete framebufferUpdate and
then receives the rest of the framebufferUpdate plus another complete
framebufferUpdate, then it will fall permanently behind.

If there is more to process after a completed framebufferUpdate, then
execute normal_msg again.

All the render routines must return false if there is not enough data
in the receive queue to process their current update, and true
otherwise.