1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Qt 4.8: peerwireclient.cpp Example File (network/torrent/peerwireclient.cpp)</title>
<link rel="stylesheet" type="text/css" href="style/offline.css" />
</head>
<body>
<div class="header" id="qtdocheader">
<div class="content">
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
</div>
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
</ul>
</div>
</div>
<div class="content mainContent">
<h1 class="title">peerwireclient.cpp Example File</h1>
<span class="small-subtitle">network/torrent/peerwireclient.cpp</span>
<!-- $$$network/torrent/peerwireclient.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "peerwireclient.h"</span>
<span class="preprocessor">#include <QHostAddress></span>
<span class="preprocessor">#include <QTimerEvent></span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> PendingRequestTimeout <span class="operator">=</span> <span class="number">60</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> ClientTimeout <span class="operator">=</span> <span class="number">120</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> ConnectTimeout <span class="operator">=</span> <span class="number">60</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> KeepAliveInterval <span class="operator">=</span> <span class="number">30</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> RateControlTimerDelay <span class="operator">=</span> <span class="number">2000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> MinimalHeaderSize <span class="operator">=</span> <span class="number">48</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> FullHeaderSize <span class="operator">=</span> <span class="number">68</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> ProtocolId<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> <span class="string">"BitTorrent protocol"</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> ProtocolIdSize <span class="operator">=</span> <span class="number">19</span>;
<span class="comment">// Reads a 32bit unsigned int from data in network order.</span>
<span class="keyword">static</span> <span class="keyword">inline</span> <span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> fromNetworkData(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>data)
{
<span class="keyword">const</span> <span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span>udata <span class="operator">=</span> (<span class="keyword">const</span> <span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span>)data;
<span class="keyword">return</span> (<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(udata<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">24</span>)
<span class="operator">|</span> (<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(udata<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">16</span>)
<span class="operator">|</span> (<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(udata<span class="operator">[</span><span class="number">2</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span>)
<span class="operator">|</span> (<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(udata<span class="operator">[</span><span class="number">3</span><span class="operator">]</span>));
}
<span class="comment">// Writes a 32bit unsigned int from num to data in network order.</span>
<span class="keyword">static</span> <span class="keyword">inline</span> <span class="type">void</span> toNetworkData(<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> num<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>data)
{
<span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span>udata <span class="operator">=</span> (<span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span>)data;
udata<span class="operator">[</span><span class="number">3</span><span class="operator">]</span> <span class="operator">=</span> (num <span class="operator">&</span> <span class="number">0xff</span>);
udata<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> (num <span class="operator">&</span> <span class="number">0xff00</span>) <span class="operator">></span><span class="operator">></span> <span class="number">8</span>;
udata<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> (num <span class="operator">&</span> <span class="number">0xff0000</span>) <span class="operator">></span><span class="operator">></span> <span class="number">16</span>;
udata<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> (num <span class="operator">&</span> <span class="number">0xff000000</span>) <span class="operator">></span><span class="operator">></span> <span class="number">24</span>;
}
<span class="comment">// Constructs an unconnected PeerWire client and starts the connect timer.</span>
PeerWireClient<span class="operator">::</span>PeerWireClient(<span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>peerId<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span>(parent)<span class="operator">,</span> pendingBlockSizes(<span class="number">0</span>)<span class="operator">,</span>
pwState(ChokingPeer <span class="operator">|</span> ChokedByPeer)<span class="operator">,</span> receivedHandShake(<span class="keyword">false</span>)<span class="operator">,</span> gotPeerId(<span class="keyword">false</span>)<span class="operator">,</span>
sentHandShake(<span class="keyword">false</span>)<span class="operator">,</span> nextPacketLength(<span class="operator">-</span><span class="number">1</span>)<span class="operator">,</span> pendingRequestTimer(<span class="number">0</span>)<span class="operator">,</span> invalidateTimeout(<span class="keyword">false</span>)<span class="operator">,</span>
keepAliveTimer(<span class="number">0</span>)<span class="operator">,</span> torrentPeer(<span class="number">0</span>)
{
memset(uploadSpeedData<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">sizeof</span>(uploadSpeedData));
memset(downloadSpeedData<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">sizeof</span>(downloadSpeedData));
transferSpeedTimer <span class="operator">=</span> startTimer(RateControlTimerDelay);
timeoutTimer <span class="operator">=</span> startTimer(ConnectTimeout);
peerIdString <span class="operator">=</span> peerId;
connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(readyToTransfer()));
connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(readyToTransfer()));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(connected()));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(readyRead()));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(disconnected())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(disconnected()));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError)));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(bytesWritten(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(bytesWritten(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>)));
connect(<span class="operator">&</span>socket<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketState))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(socketStateChanged(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketState)));
}
<span class="comment">// Registers the peer ID and SHA1 sum of the torrent, and initiates</span>
<span class="comment">// the handshake.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>initialize(<span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>infoHash<span class="operator">,</span> <span class="type">int</span> pieceCount)
{
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>infoHash <span class="operator">=</span> infoHash;
peerPieces<span class="operator">.</span>resize(pieceCount);
<span class="keyword">if</span> (<span class="operator">!</span>sentHandShake)
sendHandShake();
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>setPeer(TorrentPeer <span class="operator">*</span>peer)
{
torrentPeer <span class="operator">=</span> peer;
}
TorrentPeer <span class="operator">*</span>PeerWireClient<span class="operator">::</span>peer() <span class="keyword">const</span>
{
<span class="keyword">return</span> torrentPeer;
}
<span class="type"><a href="qbitarray.html">QBitArray</a></span> PeerWireClient<span class="operator">::</span>availablePieces() <span class="keyword">const</span>
{
<span class="keyword">return</span> peerPieces;
}
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>TorrentBlock<span class="operator">></span> PeerWireClient<span class="operator">::</span>incomingBlocks() <span class="keyword">const</span>
{
<span class="keyword">return</span> incoming;
}
<span class="comment">// Sends a "choke" message, asking the peer to stop requesting blocks.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>chokePeer()
{
<span class="keyword">const</span> <span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>};
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
pwState <span class="operator">|</span><span class="operator">=</span> ChokingPeer;
<span class="comment">// After receiving a choke message, the peer will assume all</span>
<span class="comment">// pending requests are lost.</span>
pendingBlocks<span class="operator">.</span>clear();
pendingBlockSizes <span class="operator">=</span> <span class="number">0</span>;
}
<span class="comment">// Sends an "unchoke" message, allowing the peer to start/resume</span>
<span class="comment">// requesting blocks.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>unchokePeer()
{
<span class="keyword">const</span> <span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>};
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
pwState <span class="operator">&</span><span class="operator">=</span> <span class="operator">~</span>ChokingPeer;
<span class="keyword">if</span> (pendingRequestTimer)
killTimer(pendingRequestTimer);
}
<span class="comment">// Sends a "keep-alive" message to prevent the peer from closing</span>
<span class="comment">// the connection when there's no activity</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendKeepAlive()
{
<span class="keyword">const</span> <span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>};
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
}
<span class="comment">// Sends an "interested" message, informing the peer that it has got</span>
<span class="comment">// pieces that we'd like to download.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendInterested()
{
<span class="keyword">const</span> <span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>};
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
pwState <span class="operator">|</span><span class="operator">=</span> InterestedInPeer;
<span class="comment">// After telling the peer that we're interested, we expect to get</span>
<span class="comment">// unchoked within a certain timeframe; otherwise we'll drop the</span>
<span class="comment">// connection.</span>
<span class="keyword">if</span> (pendingRequestTimer)
killTimer(pendingRequestTimer);
pendingRequestTimer <span class="operator">=</span> startTimer(PendingRequestTimeout);
}
<span class="comment">// Sends a "not interested" message, informing the peer that it does</span>
<span class="comment">// not have any pieces that we'd like to download.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendNotInterested()
{
<span class="keyword">const</span> <span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">3</span>};
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
pwState <span class="operator">&</span><span class="operator">=</span> <span class="operator">~</span>InterestedInPeer;
}
<span class="comment">// Sends a piece notification / a "have" message, informing the peer</span>
<span class="comment">// that we have just downloaded a new piece.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendPieceNotification(<span class="type">int</span> piece)
{
<span class="keyword">if</span> (<span class="operator">!</span>sentHandShake)
sendHandShake();
<span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>};
toNetworkData(piece<span class="operator">,</span> <span class="operator">&</span>message<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>);
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
}
<span class="comment">// Sends the complete list of pieces that we have downloaded.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendPieceList(<span class="keyword">const</span> <span class="type"><a href="qbitarray.html">QBitArray</a></span> <span class="operator">&</span>bitField)
{
<span class="comment">// The bitfield message may only be sent immediately after the</span>
<span class="comment">// handshaking sequence is completed, and before any other</span>
<span class="comment">// messages are sent.</span>
<span class="keyword">if</span> (<span class="operator">!</span>sentHandShake)
sendHandShake();
<span class="comment">// Don't send the bitfield if it's all zeros.</span>
<span class="keyword">if</span> (bitField<span class="operator">.</span>count(<span class="keyword">true</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type">int</span> bitFieldSize <span class="operator">=</span> bitField<span class="operator">.</span>size();
<span class="type">int</span> size <span class="operator">=</span> (bitFieldSize <span class="operator">+</span> <span class="number">7</span>) <span class="operator">/</span> <span class="number">8</span>;
<span class="type"><a href="qbytearray.html">QByteArray</a></span> bits(size<span class="operator">,</span> <span class="char">'\0'</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> bitFieldSize; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (bitField<span class="operator">.</span>testBit(i)) {
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> byte <span class="operator">=</span> <span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(i) <span class="operator">/</span> <span class="number">8</span>;
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> bit <span class="operator">=</span> <span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(i) <span class="operator">%</span> <span class="number">8</span>;
bits<span class="operator">[</span>byte<span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span>(bits<span class="operator">.</span>at(byte)) <span class="operator">|</span> (<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> (<span class="number">7</span> <span class="operator">-</span> bit));
}
}
<span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">5</span>};
toNetworkData(bits<span class="operator">.</span>size() <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>message<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
write(bits);
}
<span class="comment">// Sends a request for a block.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>requestBlock(<span class="type">int</span> piece<span class="operator">,</span> <span class="type">int</span> offset<span class="operator">,</span> <span class="type">int</span> length)
{
<span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">6</span>};
toNetworkData(<span class="number">13</span><span class="operator">,</span> <span class="operator">&</span>message<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
<span class="type">char</span> numbers<span class="operator">[</span><span class="number">4</span> <span class="operator">*</span> <span class="number">3</span><span class="operator">]</span>;
toNetworkData(piece<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
toNetworkData(offset<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>);
toNetworkData(length<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">8</span><span class="operator">]</span>);
write(numbers<span class="operator">,</span> <span class="keyword">sizeof</span>(numbers));
incoming <span class="operator"><</span><span class="operator"><</span> TorrentBlock(piece<span class="operator">,</span> offset<span class="operator">,</span> length);
<span class="comment">// After requesting a block, we expect the block to be sent by the</span>
<span class="comment">// other peer within a certain number of seconds. Otherwise, we</span>
<span class="comment">// drop the connection.</span>
<span class="keyword">if</span> (pendingRequestTimer)
killTimer(pendingRequestTimer);
pendingRequestTimer <span class="operator">=</span> startTimer(PendingRequestTimeout);
}
<span class="comment">// Cancels a request for a block.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>cancelRequest(<span class="type">int</span> piece<span class="operator">,</span> <span class="type">int</span> offset<span class="operator">,</span> <span class="type">int</span> length)
{
<span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">8</span>};
toNetworkData(<span class="number">13</span><span class="operator">,</span> <span class="operator">&</span>message<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
write(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
<span class="type">char</span> numbers<span class="operator">[</span><span class="number">4</span> <span class="operator">*</span> <span class="number">3</span><span class="operator">]</span>;
toNetworkData(piece<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
toNetworkData(offset<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>);
toNetworkData(length<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">8</span><span class="operator">]</span>);
write(numbers<span class="operator">,</span> <span class="keyword">sizeof</span>(numbers));
incoming<span class="operator">.</span>removeAll(TorrentBlock(piece<span class="operator">,</span> offset<span class="operator">,</span> length));
}
<span class="comment">// Sends a block to the peer.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendBlock(<span class="type">int</span> piece<span class="operator">,</span> <span class="type">int</span> offset<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>data)
{
<span class="type"><a href="qbytearray.html">QByteArray</a></span> block;
<span class="type">char</span> message<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">7</span>};
toNetworkData(<span class="number">9</span> <span class="operator">+</span> data<span class="operator">.</span>size()<span class="operator">,</span> <span class="operator">&</span>message<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
block <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span>(message<span class="operator">,</span> <span class="keyword">sizeof</span>(message));
<span class="type">char</span> numbers<span class="operator">[</span><span class="number">4</span> <span class="operator">*</span> <span class="number">2</span><span class="operator">]</span>;
toNetworkData(piece<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);
toNetworkData(offset<span class="operator">,</span> <span class="operator">&</span>numbers<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>);
block <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span>(numbers<span class="operator">,</span> <span class="keyword">sizeof</span>(numbers));
block <span class="operator">+</span><span class="operator">=</span> data;
BlockInfo blockInfo;
blockInfo<span class="operator">.</span>pieceIndex <span class="operator">=</span> piece;
blockInfo<span class="operator">.</span>offset <span class="operator">=</span> offset;
blockInfo<span class="operator">.</span>length <span class="operator">=</span> data<span class="operator">.</span>size();
blockInfo<span class="operator">.</span>block <span class="operator">=</span> block;
pendingBlocks <span class="operator"><</span><span class="operator"><</span> blockInfo;
pendingBlockSizes <span class="operator">+</span><span class="operator">=</span> block<span class="operator">.</span>size();
<span class="keyword">if</span> (pendingBlockSizes <span class="operator">></span> <span class="number">32</span> <span class="operator">*</span> <span class="number">16384</span>) {
chokePeer();
unchokePeer();
<span class="keyword">return</span>;
}
<span class="keyword">emit</span> readyToTransfer();
}
<span class="comment">// Attempts to write 'bytes' bytes to the socket from the buffer.</span>
<span class="comment">// This is used by RateController, which precisely controls how much</span>
<span class="comment">// each client can write.</span>
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>writeToSocket(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytes)
{
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> totalWritten <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">do</span> {
<span class="keyword">if</span> (outgoingBuffer<span class="operator">.</span>isEmpty() <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>pendingBlocks<span class="operator">.</span>isEmpty()) {
BlockInfo block <span class="operator">=</span> pendingBlocks<span class="operator">.</span>takeFirst();
pendingBlockSizes <span class="operator">-</span><span class="operator">=</span> block<span class="operator">.</span>length;
outgoingBuffer <span class="operator">+</span><span class="operator">=</span> block<span class="operator">.</span>block;
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> written <span class="operator">=</span> socket<span class="operator">.</span>write(outgoingBuffer<span class="operator">.</span>constData()<span class="operator">,</span>
<a href="qtglobal.html#qMin">qMin</a><span class="operator"><</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">></span>(bytes <span class="operator">-</span> totalWritten<span class="operator">,</span> outgoingBuffer<span class="operator">.</span>size()));
<span class="keyword">if</span> (written <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span> totalWritten <span class="operator">?</span> totalWritten : written;
totalWritten <span class="operator">+</span><span class="operator">=</span> written;
uploadSpeedData<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">+</span><span class="operator">=</span> written;
outgoingBuffer<span class="operator">.</span>remove(<span class="number">0</span><span class="operator">,</span> written);
} <span class="keyword">while</span> (totalWritten <span class="operator"><</span> bytes <span class="operator">&</span><span class="operator">&</span> (<span class="operator">!</span>outgoingBuffer<span class="operator">.</span>isEmpty() <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>pendingBlocks<span class="operator">.</span>isEmpty()));
<span class="keyword">return</span> totalWritten;
}
<span class="comment">// Attempts to read at most 'bytes' bytes from the socket.</span>
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>readFromSocket(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytes)
{
<span class="type">char</span> buffer<span class="operator">[</span><span class="number">1024</span><span class="operator">]</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> totalRead <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">do</span> {
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytesRead <span class="operator">=</span> socket<span class="operator">.</span>read(buffer<span class="operator">,</span> <a href="qtglobal.html#qMin">qMin</a><span class="operator"><</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">></span>(<span class="keyword">sizeof</span>(buffer)<span class="operator">,</span> bytes <span class="operator">-</span> totalRead));
<span class="keyword">if</span> (bytesRead <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">break</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> oldSize <span class="operator">=</span> incomingBuffer<span class="operator">.</span>size();
incomingBuffer<span class="operator">.</span>resize(oldSize <span class="operator">+</span> bytesRead);
memcpy(incomingBuffer<span class="operator">.</span>data() <span class="operator">+</span> oldSize<span class="operator">,</span> buffer<span class="operator">,</span> bytesRead);
totalRead <span class="operator">+</span><span class="operator">=</span> bytesRead;
} <span class="keyword">while</span> (totalRead <span class="operator"><</span> bytes);
<span class="keyword">if</span> (totalRead <span class="operator">></span> <span class="number">0</span>) {
downloadSpeedData<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">+</span><span class="operator">=</span> totalRead;
<span class="keyword">emit</span> bytesReceived(totalRead);
processIncomingData();
}
<span class="keyword">return</span> totalRead;
}
<span class="comment">// Returns the average number of bytes per second this client is</span>
<span class="comment">// downloading.</span>
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>downloadSpeed() <span class="keyword">const</span>
{
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> sum <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">unsigned</span> <span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="keyword">sizeof</span>(downloadSpeedData) <span class="operator">/</span> <span class="keyword">sizeof</span>(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>); <span class="operator">+</span><span class="operator">+</span>i)
sum <span class="operator">+</span><span class="operator">=</span> downloadSpeedData<span class="operator">[</span>i<span class="operator">]</span>;
<span class="keyword">return</span> sum <span class="operator">/</span> (<span class="number">8</span> <span class="operator">*</span> <span class="number">2</span>);
}
<span class="comment">// Returns the average number of bytes per second this client is</span>
<span class="comment">// uploading.</span>
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>uploadSpeed() <span class="keyword">const</span>
{
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> sum <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">unsigned</span> <span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="keyword">sizeof</span>(uploadSpeedData) <span class="operator">/</span> <span class="keyword">sizeof</span>(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>); <span class="operator">+</span><span class="operator">+</span>i)
sum <span class="operator">+</span><span class="operator">=</span> uploadSpeedData<span class="operator">[</span>i<span class="operator">]</span>;
<span class="keyword">return</span> sum <span class="operator">/</span> (<span class="number">8</span> <span class="operator">*</span> <span class="number">2</span>);
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>setReadBufferSize(<span class="type">int</span> size)
{
socket<span class="operator">.</span>setReadBufferSize(size);
}
<span class="type">bool</span> PeerWireClient<span class="operator">::</span>canTransferMore() <span class="keyword">const</span>
{
<span class="keyword">return</span> bytesAvailable() <span class="operator">></span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> socket<span class="operator">.</span>bytesAvailable() <span class="operator">></span> <span class="number">0</span>
<span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>outgoingBuffer<span class="operator">.</span>isEmpty() <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>pendingBlocks<span class="operator">.</span>isEmpty();
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>connectToHostImplementation(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>hostName<span class="operator">,</span>
<span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span> port<span class="operator">,</span> OpenMode openMode)
{
setOpenMode(openMode);
socket<span class="operator">.</span>connectToHost(hostName<span class="operator">,</span> port<span class="operator">,</span> openMode);
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>diconnectFromHostImplementation()
{
socket<span class="operator">.</span>disconnectFromHost();
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> transferSpeedTimer) {
<span class="comment">// Rotate the upload / download records.</span>
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">6</span>; i <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>i) {
uploadSpeedData<span class="operator">[</span>i <span class="operator">+</span> <span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> uploadSpeedData<span class="operator">[</span>i<span class="operator">]</span>;
downloadSpeedData<span class="operator">[</span>i <span class="operator">+</span> <span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> downloadSpeedData<span class="operator">[</span>i<span class="operator">]</span>;
}
uploadSpeedData<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span>;
downloadSpeedData<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> timeoutTimer) {
<span class="comment">// Disconnect if we timed out; otherwise the timeout is</span>
<span class="comment">// restarted.</span>
<span class="keyword">if</span> (invalidateTimeout) {
invalidateTimeout <span class="operator">=</span> <span class="keyword">false</span>;
} <span class="keyword">else</span> {
abort();
<span class="keyword">emit</span> infoHashReceived(<span class="type"><a href="qbytearray.html">QByteArray</a></span>());
}
} <span class="keyword">else</span> <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> pendingRequestTimer) {
abort();
} <span class="keyword">else</span> <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> keepAliveTimer) {
sendKeepAlive();
}
<span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span><span class="operator">::</span>timerEvent(event);
}
<span class="comment">// Sends the handshake to the peer.</span>
<span class="type">void</span> PeerWireClient<span class="operator">::</span>sendHandShake()
{
sentHandShake <span class="operator">=</span> <span class="keyword">true</span>;
<span class="comment">// Restart the timeout</span>
<span class="keyword">if</span> (timeoutTimer)
killTimer(timeoutTimer);
timeoutTimer <span class="operator">=</span> startTimer(ClientTimeout);
<span class="comment">// Write the 68 byte PeerWire handshake.</span>
write(<span class="operator">&</span>ProtocolIdSize<span class="operator">,</span> <span class="number">1</span>);
write(ProtocolId<span class="operator">,</span> ProtocolIdSize);
write(<span class="type"><a href="qbytearray.html">QByteArray</a></span>(<span class="number">8</span><span class="operator">,</span> <span class="char">'\0'</span>));
write(infoHash);
write(peerIdString);
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>processIncomingData()
{
invalidateTimeout <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (<span class="operator">!</span>receivedHandShake) {
<span class="comment">// Check that we received enough data</span>
<span class="keyword">if</span> (bytesAvailable() <span class="operator"><</span> MinimalHeaderSize)
<span class="keyword">return</span>;
<span class="comment">// Sanity check the protocol ID</span>
<span class="type"><a href="qbytearray.html">QByteArray</a></span> id <span class="operator">=</span> read(ProtocolIdSize <span class="operator">+</span> <span class="number">1</span>);
<span class="keyword">if</span> (id<span class="operator">.</span>at(<span class="number">0</span>) <span class="operator">!</span><span class="operator">=</span> ProtocolIdSize <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>id<span class="operator">.</span>mid(<span class="number">1</span>)<span class="operator">.</span>startsWith(ProtocolId)) {
abort();
<span class="keyword">return</span>;
}
<span class="comment">// Discard 8 reserved bytes, then read the info hash and peer ID</span>
(<span class="type">void</span>) read(<span class="number">8</span>);
<span class="comment">// Read infoHash</span>
<span class="type"><a href="qbytearray.html">QByteArray</a></span> peerInfoHash <span class="operator">=</span> read(<span class="number">20</span>);
<span class="keyword">if</span> (<span class="operator">!</span>infoHash<span class="operator">.</span>isEmpty() <span class="operator">&</span><span class="operator">&</span> peerInfoHash <span class="operator">!</span><span class="operator">=</span> infoHash) {
abort();
<span class="keyword">return</span>;
}
<span class="keyword">emit</span> infoHashReceived(peerInfoHash);
<span class="keyword">if</span> (infoHash<span class="operator">.</span>isEmpty()) {
abort();
<span class="keyword">return</span>;
}
<span class="comment">// Send handshake</span>
<span class="keyword">if</span> (<span class="operator">!</span>sentHandShake)
sendHandShake();
receivedHandShake <span class="operator">=</span> <span class="keyword">true</span>;
}
<span class="comment">// Handle delayed peer id arrival</span>
<span class="keyword">if</span> (<span class="operator">!</span>gotPeerId) {
<span class="keyword">if</span> (bytesAvailable() <span class="operator"><</span> <span class="number">20</span>)
<span class="keyword">return</span>;
gotPeerId <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (read(<span class="number">20</span>) <span class="operator">=</span><span class="operator">=</span> peerIdString) {
<span class="comment">// We connected to ourself</span>
abort();
<span class="keyword">return</span>;
}
}
<span class="comment">// Initialize keep-alive timer</span>
<span class="keyword">if</span> (<span class="operator">!</span>keepAliveTimer)
keepAliveTimer <span class="operator">=</span> startTimer(KeepAliveInterval);
<span class="keyword">do</span> {
<span class="comment">// Find the packet length</span>
<span class="keyword">if</span> (nextPacketLength <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
<span class="keyword">if</span> (bytesAvailable() <span class="operator"><</span> <span class="number">4</span>)
<span class="keyword">return</span>;
<span class="type">char</span> tmp<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>;
read(tmp<span class="operator">,</span> <span class="keyword">sizeof</span>(tmp));
nextPacketLength <span class="operator">=</span> fromNetworkData(tmp);
<span class="keyword">if</span> (nextPacketLength <span class="operator"><</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> nextPacketLength <span class="operator">></span> <span class="number">200000</span>) {
<span class="comment">// Prevent DoS</span>
abort();
<span class="keyword">return</span>;
}
}
<span class="comment">// KeepAlive</span>
<span class="keyword">if</span> (nextPacketLength <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
nextPacketLength <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
<span class="keyword">continue</span>;
}
<span class="comment">// Wait with parsing until the whole packet has been received</span>
<span class="keyword">if</span> (bytesAvailable() <span class="operator"><</span> nextPacketLength)
<span class="keyword">return</span>;
<span class="comment">// Read the packet</span>
<span class="type"><a href="qbytearray.html">QByteArray</a></span> packet <span class="operator">=</span> read(nextPacketLength);
<span class="keyword">if</span> (packet<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> nextPacketLength) {
abort();
<span class="keyword">return</span>;
}
<span class="keyword">switch</span> (packet<span class="operator">.</span>at(<span class="number">0</span>)) {
<span class="keyword">case</span> ChokePacket:
<span class="comment">// We have been choked.</span>
pwState <span class="operator">|</span><span class="operator">=</span> ChokedByPeer;
incoming<span class="operator">.</span>clear();
<span class="keyword">if</span> (pendingRequestTimer)
killTimer(pendingRequestTimer);
<span class="keyword">emit</span> choked();
<span class="keyword">break</span>;
<span class="keyword">case</span> UnchokePacket:
<span class="comment">// We have been unchoked.</span>
pwState <span class="operator">&</span><span class="operator">=</span> <span class="operator">~</span>ChokedByPeer;
<span class="keyword">emit</span> unchoked();
<span class="keyword">break</span>;
<span class="keyword">case</span> InterestedPacket:
<span class="comment">// The peer is interested in downloading.</span>
pwState <span class="operator">|</span><span class="operator">=</span> PeerIsInterested;
<span class="keyword">emit</span> interested();
<span class="keyword">break</span>;
<span class="keyword">case</span> NotInterestedPacket:
<span class="comment">// The peer is not interested in downloading.</span>
pwState <span class="operator">&</span><span class="operator">=</span> <span class="operator">~</span>PeerIsInterested;
<span class="keyword">emit</span> notInterested();
<span class="keyword">break</span>;
<span class="keyword">case</span> HavePacket: {
<span class="comment">// The peer has a new piece available.</span>
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> index <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>);
<span class="keyword">if</span> (index <span class="operator"><</span> <span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span>(peerPieces<span class="operator">.</span>size())) {
<span class="comment">// Only accept indexes within the valid range.</span>
peerPieces<span class="operator">.</span>setBit(<span class="type">int</span>(index));
}
<span class="keyword">emit</span> piecesAvailable(availablePieces());
<span class="keyword">break</span>;
}
<span class="keyword">case</span> BitFieldPacket:
<span class="comment">// The peer has the following pieces available.</span>
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator"><</span> packet<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> (<span class="type">int</span> bit <span class="operator">=</span> <span class="number">0</span>; bit <span class="operator"><</span> <span class="number">8</span>; <span class="operator">+</span><span class="operator">+</span>bit) {
<span class="keyword">if</span> (packet<span class="operator">.</span>at(i) <span class="operator">&</span> (<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> (<span class="number">7</span> <span class="operator">-</span> bit))) {
<span class="type">int</span> bitIndex <span class="operator">=</span> <span class="type">int</span>(((i <span class="operator">-</span> <span class="number">1</span>) <span class="operator">*</span> <span class="number">8</span>) <span class="operator">+</span> bit);
<span class="keyword">if</span> (bitIndex <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> bitIndex <span class="operator"><</span> peerPieces<span class="operator">.</span>size()) {
<span class="comment">// Occasionally, broken clients claim to have</span>
<span class="comment">// pieces whose index is outside the valid range.</span>
<span class="comment">// The most common mistake is the index == size</span>
<span class="comment">// case.</span>
peerPieces<span class="operator">.</span>setBit(bitIndex);
}
}
}
}
<span class="keyword">emit</span> piecesAvailable(availablePieces());
<span class="keyword">break</span>;
<span class="keyword">case</span> RequestPacket: {
<span class="comment">// The peer requests a block.</span>
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> index <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>);
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> begin <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>);
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> length <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">9</span><span class="operator">]</span>);
<span class="keyword">emit</span> blockRequested(<span class="type">int</span>(index)<span class="operator">,</span> <span class="type">int</span>(begin)<span class="operator">,</span> <span class="type">int</span>(length));
<span class="keyword">break</span>;
}
<span class="keyword">case</span> PiecePacket: {
<span class="type">int</span> index <span class="operator">=</span> <span class="type">int</span>(fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>));
<span class="type">int</span> begin <span class="operator">=</span> <span class="type">int</span>(fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>));
incoming<span class="operator">.</span>removeAll(TorrentBlock(index<span class="operator">,</span> begin<span class="operator">,</span> packet<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">9</span>));
<span class="comment">// The peer sends a block.</span>
<span class="keyword">emit</span> blockReceived(index<span class="operator">,</span> begin<span class="operator">,</span> packet<span class="operator">.</span>mid(<span class="number">9</span>));
<span class="comment">// Kill the pending block timer.</span>
<span class="keyword">if</span> (pendingRequestTimer) {
killTimer(pendingRequestTimer);
pendingRequestTimer <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">break</span>;
}
<span class="keyword">case</span> CancelPacket: {
<span class="comment">// The peer cancels a block request.</span>
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> index <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>);
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> begin <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>);
<span class="type"><a href="qtglobal.html#quint32-typedef">quint32</a></span> length <span class="operator">=</span> fromNetworkData(<span class="operator">&</span>packet<span class="operator">.</span>data()<span class="operator">[</span><span class="number">9</span><span class="operator">]</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> pendingBlocks<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">const</span> BlockInfo <span class="operator">&</span>blockInfo <span class="operator">=</span> pendingBlocks<span class="operator">.</span>at(i);
<span class="keyword">if</span> (blockInfo<span class="operator">.</span>pieceIndex <span class="operator">=</span><span class="operator">=</span> <span class="type">int</span>(index)
<span class="operator">&</span><span class="operator">&</span> blockInfo<span class="operator">.</span>offset <span class="operator">=</span><span class="operator">=</span> <span class="type">int</span>(begin)
<span class="operator">&</span><span class="operator">&</span> blockInfo<span class="operator">.</span>length <span class="operator">=</span><span class="operator">=</span> <span class="type">int</span>(length)) {
pendingBlocks<span class="operator">.</span>removeAt(i);
<span class="keyword">break</span>;
}
}
<span class="keyword">break</span>;
}
<span class="keyword">default</span>:
<span class="comment">// Unsupported packet type; just ignore it.</span>
<span class="keyword">break</span>;
}
nextPacketLength <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
} <span class="keyword">while</span> (bytesAvailable() <span class="operator">></span> <span class="number">0</span>);
}
<span class="type">void</span> PeerWireClient<span class="operator">::</span>socketStateChanged(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketState state)
{
setLocalAddress(socket<span class="operator">.</span>localAddress());
setLocalPort(socket<span class="operator">.</span>localPort());
setPeerName(socket<span class="operator">.</span>peerName());
setPeerAddress(socket<span class="operator">.</span>peerAddress());
setPeerPort(socket<span class="operator">.</span>peerPort());
setSocketState(state);
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>readData(<span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> size)
{
<span class="type">int</span> n <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(size<span class="operator">,</span> incomingBuffer<span class="operator">.</span>size());
memcpy(data<span class="operator">,</span> incomingBuffer<span class="operator">.</span>constData()<span class="operator">,</span> n);
incomingBuffer<span class="operator">.</span>remove(<span class="number">0</span><span class="operator">,</span> n);
<span class="keyword">return</span> n;
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>readLineData(<span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> maxlen)
{
<span class="keyword">return</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>readLineData(data<span class="operator">,</span> maxlen);
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> PeerWireClient<span class="operator">::</span>writeData(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> size)
{
<span class="type">int</span> oldSize <span class="operator">=</span> outgoingBuffer<span class="operator">.</span>size();
outgoingBuffer<span class="operator">.</span>resize(oldSize <span class="operator">+</span> size);
memcpy(outgoingBuffer<span class="operator">.</span>data() <span class="operator">+</span> oldSize<span class="operator">,</span> data<span class="operator">,</span> size);
<span class="keyword">emit</span> readyToTransfer();
<span class="keyword">return</span> size;
}</pre>
</div>
<!-- @@@network/torrent/peerwireclient.cpp -->
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2012 Nokia Corporation and/or its
subsidiaries. Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Nokia, Qt and their respective logos are trademarks of Nokia Corporation
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
</body>
</html>
|
