deb-novnc/include/playback.js
Solly Ross c5e051b3b3 Use Typed Arrays for the Websock receive queue
**This commit removes Base64 (and Flash) support**

This commit converts websock.js to used Typed Arrays for the
receive queue (and tweaks rfb.js to ensure that it continues
to function, since only Firefox implements
`%TypedArray%.prototype.slice`).  Base64 support was removed
to simplify code paths, and pave the way for using Typed Arrays
for the send queue as well.

This provides two advantages: first, we allocate a buffer ahead
of time, meaning the browser doesn't have to do any work dynamically
increasing the receive queue size.  Secondly, we are now able to pass
around Typed Array Views (e.g. `Uint8Array`), which are lightweight, and
don't involve copying.

The downside is that we initially allocate more memory -- we currently
start out with 4 MiB, and then automatically double when it looks like
the amount unused is getting to small.

The commit also explicitly adds a check to the compacting logic that
avoids calling the copy functions if `_rQlen === _rQi`.
2015-08-06 14:47:03 -04:00

121 lines
3.1 KiB
JavaScript

/*
* noVNC: HTML5 VNC client
* Copyright (C) 2012 Joel Martin
* Licensed under MPL 2.0 (see LICENSE.txt)
*/
"use strict";
/*jslint browser: true, white: false */
/*global Util, VNC_frame_data, finish */
var rfb, mode, test_state, frame_idx, frame_length,
iteration, iterations, istart_time,
// Pre-declarations for jslint
send_array, next_iteration, queue_next_packet, do_packet, enable_test_mode;
// Override send_array
send_array = function (arr) {
// Stub out send_array
};
enable_test_mode = function () {
rfb._sock._mode = VNC_frame_encoding;
rfb._sock.send = send_array;
rfb._sock.close = function () {};
rfb._sock.flush = function () {};
rfb._checkEvents = function () {};
rfb.connect = function (host, port, password, path) {
this._rfb_host = host;
this._rfb_port = port;
this._rfb_password = (password !== undefined) ? password : "";
this._rfb_path = (path !== undefined) ? path : "";
this._sock.init('binary', 'ws');
this._updateState('ProtocolVersion', "Starting VNC handshake");
};
};
next_iteration = function () {
rfb = new RFB({'target': $D('VNC_canvas'),
'onUpdateState': updateState});
enable_test_mode();
if (iteration === 0) {
frame_length = VNC_frame_data.length;
test_state = 'running';
}
if (test_state !== 'running') { return; }
iteration += 1;
if (iteration > iterations) {
finish();
return;
}
frame_idx = 0;
istart_time = (new Date()).getTime();
rfb.connect('test', 0, "bogus");
queue_next_packet();
};
queue_next_packet = function () {
var frame, foffset, toffset, delay;
if (test_state !== 'running') { return; }
frame = VNC_frame_data[frame_idx];
while ((frame_idx < frame_length) && (frame.charAt(0) === "}")) {
//Util.Debug("Send frame " + frame_idx);
frame_idx += 1;
frame = VNC_frame_data[frame_idx];
}
if (frame === 'EOF') {
Util.Debug("Finished, found EOF");
next_iteration();
return;
}
if (frame_idx >= frame_length) {
Util.Debug("Finished, no more frames");
next_iteration();
return;
}
if (mode === 'realtime') {
foffset = frame.slice(1, frame.indexOf('{', 1));
toffset = (new Date()).getTime() - istart_time;
delay = foffset - toffset;
if (delay < 1) {
delay = 1;
}
setTimeout(do_packet, delay);
} else {
setTimeout(do_packet, 1);
}
};
var bytes_processed = 0;
do_packet = function () {
//Util.Debug("Processing frame: " + frame_idx);
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._sock._recv_message({'data' : u8});
} else {
rfb._sock._recv_message({'data' : frame.slice(start)});
}
frame_idx += 1;
queue_next_packet();
};