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Add support for fences

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We don't actually use these, but servers may require this for other
features.
This commit is contained in:
samhed
2016-06-02 16:00:33 +02:00
parent 37195e4b5e
commit 3df1326239
2 changed files with 95 additions and 1 deletions
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71
include/rfb.js
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@@ -56,7 +56,8 @@ var RFB;
['last_rect', -224 ],
['Cursor', -239 ],
['ExtendedDesktopSize', -308 ],
['xvp', -309 ]
['xvp', -309 ],
['Fence', -312 ]
];
this._encHandlers = {};
@@ -70,6 +71,8 @@ var RFB;
this._disconnTimer = null; // disconnection timer
this._msgTimer = null; // queued handle_msg timer
this._supportsFence = false;
// Frame buffer update state
this._FBU = {
rects: 0,
@@ -1041,6 +1044,42 @@ var RFB;
return true;
},
_handle_server_fence_msg: function() {
if (this._sock.rQwait("ServerFence header", 8, 1)) { return false; }
this._sock.rQskipBytes(3); // Padding
var flags = this._sock.rQshift32();
var length = this._sock.rQshift8();
if (this._sock.rQwait("ServerFence payload", length, 9)) { return false; }
var payload = this._sock.rQshiftStr(length); // FIXME: 64 bytes max
this._supportsFence = true;
/*
* Fence flags
*
* (1<<0) - BlockBefore
* (1<<1) - BlockAfter
* (1<<2) - SyncNext
* (1<<31) - Request
*/
if (!(flags & (1<<31))) {
return this._fail("Unexpected fence response");
}
// Filter out unsupported flags
// FIXME: support syncNext
flags &= (1<<0) | (1<<1);
// BlockBefore and BlockAfter are automatically handled by
// the fact that we process each incoming message
// synchronuosly.
RFB.messages.clientFence(this._sock, flags, payload);
return true;
},
_handle_xvp_msg: function () {
if (this._sock.rQwait("XVP version and message", 3, 1)) { return false; }
this._sock.rQskip8(); // Padding
@@ -1092,6 +1131,9 @@ var RFB;
case 3: // ServerCutText
return this._handle_server_cut_text();
case 248: // ServerFence
return this._handle_server_fence_msg();
case 250: // XVP
return this._handle_xvp_msg();
@@ -1350,6 +1392,33 @@ var RFB;
sock.flush();
},
clientFence: function (sock, flags, payload) {
var buff = sock._sQ;
var offset = sock._sQlen;
buff[offset] = 248; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = 0; // padding
buff[offset + 3] = 0; // padding
buff[offset + 4] = flags >> 24; // flags
buff[offset + 5] = flags >> 16;
buff[offset + 6] = flags >> 8;
buff[offset + 7] = flags;
var n = payload.length;
buff[offset + 8] = n; // length
for (var i = 0; i < n; i++) {
buff[offset + 9 + i] = payload.charCodeAt(i);
}
sock._sQlen += 9 + n;
sock.flush();
},
pixelFormat: function (sock, bpp, depth, true_color) {
var buff = sock._sQ;
var offset = sock._sQlen;