summaryrefslogtreecommitdiffstats
path: root/tools/runonphone/symbianutils/trkdevice.cpp
blob: b327ab3384261fec5cc00dcbcfe7613babe3ac51 (plain)
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
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "trkdevice.h"
#include "trkutils.h"
#include "trkutils_p.h"

#include <QtCore/QString>
#include <QtCore/QDebug>
#include <QtCore/QQueue>
#include <QtCore/QHash>
#include <QtCore/QMap>
#include <QtCore/QThread>
#include <QtCore/QMutex>
#include <QtCore/QWaitCondition>
#include <QtCore/QSharedPointer>
#include <QtCore/QMetaType>

#ifdef Q_OS_WIN
#  include <windows.h>
#else
#  include <QtCore/QFile>

#  include <stdio.h>
#  include <sys/ioctl.h>
#  include <sys/types.h>
#  include <termios.h>
#  include <errno.h>
#  include <string.h>
#  include <unistd.h>
/* Required headers for select() according to POSIX.1-2001 */
#  include <sys/select.h>
/* Required headers for select() according to earlier standards:
       #include <sys/time.h>
       #include <sys/types.h>
       #include <unistd.h>
*/
#endif

#ifdef Q_OS_WIN

// Format windows error from GetLastError() value:
// TODO: Use the one provided by the utils lib.
QString winErrorMessage(unsigned long error)
{
    QString rc = QString::fromLatin1("#%1: ").arg(error);
    ushort *lpMsgBuf;

    const int len = FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER
                | FORMAT_MESSAGE_FROM_SYSTEM
                | FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL, error, 0, (LPTSTR)&lpMsgBuf, 0, NULL);
    if (len) {
        rc = QString::fromUtf16(lpMsgBuf, len);
        LocalFree(lpMsgBuf);
    } else {
        rc += QString::fromLatin1("<unknown error>");
    }
    return rc;
}

#endif

enum { verboseTrk = 0 };

namespace trk {

///////////////////////////////////////////////////////////////////////
//
// TrkMessage
//
///////////////////////////////////////////////////////////////////////

/* A message to be send to TRK, triggering a callback on receipt
 * of the answer. */
struct TrkMessage
{
    explicit TrkMessage(byte code = 0u, byte token = 0u,
                        TrkCallback callback = TrkCallback());

    byte code;
    byte token;
    QByteArray data;
    QVariant cookie;
    TrkCallback callback;
};

TrkMessage::TrkMessage(byte c, byte t, TrkCallback cb) :
    code(c),
    token(t),
    callback(cb)
{
}

QDebug operator<<(QDebug d, const TrkMessage &msg)
{
    return d << "Message: Code: " << msg.code
        << " Token: " << msg.token << " " << msg.data.toHex();
}

} // namespace trk

Q_DECLARE_METATYPE(trk::TrkMessage)
Q_DECLARE_METATYPE(trk::TrkResult)

namespace trk {

///////////////////////////////////////////////////////////////////////
//
// TrkWriteQueue: Mixin class that manages a write queue of Trk messages.
// pendingMessage()/notifyWriteResult() should be called from a worked/timer
// that writes the messages. The class does not take precautions for multithreading.
// A no-op message is simply taken off the queue. The calling class
// can use the helper invokeNoopMessage() to trigger its callback.
//
///////////////////////////////////////////////////////////////////////

class TrkWriteQueue
{    
    Q_DISABLE_COPY(TrkWriteQueue)
public:
    explicit TrkWriteQueue();

    // Enqueue messages.
    void queueTrkMessage(byte code, TrkCallback callback,
                        const QByteArray &data, const QVariant &cookie);
    void queueTrkInitialPing();

    // Call this from the device read notification with the results.
    void slotHandleResult(const TrkResult &result, QMutex *mutex = 0);

    // pendingMessage() can be called periodically in a timer to retrieve
    // the pending messages to be sent.
    enum PendingMessageResult {
        NoMessage,               // No message in queue.
        PendingMessage,          /* There is a queued message. The calling class
                                  * can write it out and use notifyWriteResult()
                                  * to notify about the result. */
        NoopMessageDequeued      // A no-op message has been dequeued. see invokeNoopMessage().
    };

    PendingMessageResult pendingMessage(TrkMessage *message);
    // Notify the queue about the success of the write operation
    // after taking the pendingMessage off.
    enum WriteResult {
        WriteOk,
        WriteFailedDiscard, // Discard failed message
        WriteFailedKeep,    // Keep failed message
    };
    void notifyWriteResult(WriteResult ok);

    // Helper function that invokes the callback of a no-op message
    static void invokeNoopMessage(trk::TrkMessage);

private:
    typedef QMap<byte, TrkMessage> TokenMessageMap;

    byte nextTrkWriteToken();

    byte m_trkWriteToken;
    QQueue<TrkMessage> m_trkWriteQueue;
    TokenMessageMap m_writtenTrkMessages;
    bool m_trkWriteBusy;
};

TrkWriteQueue::TrkWriteQueue() :
    m_trkWriteToken(0),
    m_trkWriteBusy(false)
{
}

byte TrkWriteQueue::nextTrkWriteToken()
{
    ++m_trkWriteToken;
    if (m_trkWriteToken == 0)
        ++m_trkWriteToken;
    if (verboseTrk)
        qDebug() << "Write token: " << m_trkWriteToken;
    return m_trkWriteToken;
}

void TrkWriteQueue::queueTrkMessage(byte code, TrkCallback callback,
    const QByteArray &data, const QVariant &cookie)
{
    const byte token = code == TRK_WRITE_QUEUE_NOOP_CODE ?
                                byte(0) : nextTrkWriteToken();
    TrkMessage msg(code, token, callback);
    msg.data = data;
    msg.cookie = cookie;
    m_trkWriteQueue.append(msg);
}

TrkWriteQueue::PendingMessageResult TrkWriteQueue::pendingMessage(TrkMessage *message)
{
    // Invoked from timer, try to flush out message queue
    if (m_trkWriteBusy || m_trkWriteQueue.isEmpty())
        return NoMessage;
    // Handle the noop message, just invoke CB in slot (ower thread)
    if (m_trkWriteQueue.front().code == TRK_WRITE_QUEUE_NOOP_CODE) {
        *message = m_trkWriteQueue.dequeue();
        return NoopMessageDequeued;
    }
    // Insert into map fir answers (as reading threads might get an
    // answer before notifyWriteResult(true)) is called.
    *message = m_trkWriteQueue.front();
    m_writtenTrkMessages.insert(message->token, *message);
    m_trkWriteBusy = true;
    return PendingMessage;
}

void TrkWriteQueue::invokeNoopMessage(trk::TrkMessage noopMessage)
{
    TrkResult result;
    result.code = noopMessage.code;
    result.token = noopMessage.token;
    result.data = noopMessage.data;
    result.cookie = noopMessage.cookie;
    noopMessage.callback(result);
}

void TrkWriteQueue::notifyWriteResult(WriteResult wr)
{
    // On success, dequeue message and await result
    const byte token = m_trkWriteQueue.front().token;
    switch (wr) {
    case WriteOk:
        m_trkWriteQueue.dequeue();
        break;
    case WriteFailedKeep:
    case WriteFailedDiscard:
        m_writtenTrkMessages.remove(token);
        m_trkWriteBusy = false;
        if (wr == WriteFailedDiscard)
            m_trkWriteQueue.dequeue();
        break;
    }
}

void TrkWriteQueue::slotHandleResult(const TrkResult &result, QMutex *mutex)
{
    // Find which request the message belongs to and invoke callback
    // if ACK or on NAK if desired.
    if (mutex)
        mutex->lock();
    m_trkWriteBusy = false;
    const TokenMessageMap::iterator it = m_writtenTrkMessages.find(result.token);
    if (it == m_writtenTrkMessages.end()) {
        if (mutex)
            mutex->unlock();
        return;
    }
    TrkCallback callback = it.value().callback;
    const QVariant cookie = it.value().cookie;
    m_writtenTrkMessages.erase(it);
    if (mutex)
        mutex->unlock();
    // Invoke callback
    if (callback) {
        TrkResult result1 = result;
        result1.cookie = cookie;
        callback(result1);
    }
}

void TrkWriteQueue::queueTrkInitialPing()
{
    // Ping, reset sequence count
    m_trkWriteToken = 0;
    m_trkWriteQueue.append(TrkMessage(TrkPing, 0));
}

///////////////////////////////////////////////////////////////////////
//
// DeviceContext to be shared between threads
//
///////////////////////////////////////////////////////////////////////

struct DeviceContext {
    DeviceContext();
#ifdef Q_OS_WIN
    HANDLE device;
    OVERLAPPED readOverlapped;
    OVERLAPPED writeOverlapped;
#else
    QFile file;
#endif
    bool serialFrame;
    QMutex mutex;
};

DeviceContext::DeviceContext() :
#ifdef Q_OS_WIN
    device(INVALID_HANDLE_VALUE),
#endif
    serialFrame(true)
{
}

///////////////////////////////////////////////////////////////////////
//
// TrkWriterThread: A thread operating a TrkWriteQueue.
// with exception of the handling of the  TRK_WRITE_QUEUE_NOOP_CODE
// synchronization message. The invocation of the callback is then
// done by the thread owning the TrkWriteQueue, while pendingMessage() is called
// from another thread. This happens via a Qt::BlockingQueuedConnection.

///////////////////////////////////////////////////////////////////////

class WriterThread : public QThread
{
    Q_OBJECT
    Q_DISABLE_COPY(WriterThread)
public:            
    explicit WriterThread(const QSharedPointer<DeviceContext> &context);

    // Enqueue messages.
    void queueTrkMessage(byte code, TrkCallback callback,
                        const QByteArray &data, const QVariant &cookie);
    void queueTrkInitialPing();

    // Call this from the device read notification with the results.
    void slotHandleResult(const TrkResult &result);

    virtual void run();

signals:
    void error(const QString &);
    void internalNoopMessageDequeued(const trk::TrkMessage&);

public slots:
    bool trkWriteRawMessage(const TrkMessage &msg);
    void terminate();
    void tryWrite();

private slots:
    void invokeNoopMessage(const trk::TrkMessage &);

private:    
    bool write(const QByteArray &data, QString *errorMessage);
    inline int writePendingMessage();

    const QSharedPointer<DeviceContext> m_context;
    QMutex m_dataMutex;
    QMutex m_waitMutex;
    QWaitCondition m_waitCondition;
    TrkWriteQueue m_queue;
    bool m_terminate;
};

WriterThread::WriterThread(const QSharedPointer<DeviceContext> &context) :
    m_context(context),
    m_terminate(false)
{
    static const int trkMessageMetaId = qRegisterMetaType<trk::TrkMessage>();
    Q_UNUSED(trkMessageMetaId)
    connect(this, SIGNAL(internalNoopMessageDequeued(trk::TrkMessage)),
            this, SLOT(invokeNoopMessage(trk::TrkMessage)), Qt::BlockingQueuedConnection);
}

void WriterThread::run()
{
    while (writePendingMessage() == 0) ;
}

int WriterThread::writePendingMessage()
{
    enum { MaxAttempts = 100, RetryIntervalMS = 200 };

    // Wait. Use a timeout in case something is already queued before we
    // start up or some weird hanging exit condition
    m_waitMutex.lock();
    m_waitCondition.wait(&m_waitMutex, 100);
    m_waitMutex.unlock();
    if (m_terminate)
        return 1;

    // Send off message
    m_dataMutex.lock();
    TrkMessage message;
    const TrkWriteQueue::PendingMessageResult pr = m_queue.pendingMessage(&message);
    m_dataMutex.unlock();

    switch (pr) {
    case TrkWriteQueue::NoMessage:
        break;
    case TrkWriteQueue::PendingMessage: {
            //qDebug() << "Write pending message " << message;
            // Untested: try to re-send a few times
            bool success = false;
            for (int r = 0; !success && (r < MaxAttempts); r++) {
                success = trkWriteRawMessage(message);
                if (!success) {
                    emit error(QString::fromLatin1("Write failure, attempt %1 of %2.").arg(r).arg(int(MaxAttempts)));
                    if (m_terminate)
                        return 1;
                    QThread::msleep(RetryIntervalMS);
                }
            }
            // Notify queue. If still failed, give up.
            m_dataMutex.lock();
            m_queue.notifyWriteResult(success ? TrkWriteQueue::WriteOk : TrkWriteQueue::WriteFailedDiscard);
            m_dataMutex.unlock();
        }
        break;
    case TrkWriteQueue::NoopMessageDequeued:
        // Sync with thread that owns us via a blocking signal
        if (verboseTrk)
            qDebug() << "Noop message dequeued" << message;
        emit internalNoopMessageDequeued(message);
        break;
    } // switch
    return 0;
}

void WriterThread::invokeNoopMessage(const trk::TrkMessage &msg)
{
    TrkWriteQueue::invokeNoopMessage(msg);
}

void WriterThread::terminate()
{
    m_terminate = true;
    m_waitCondition.wakeAll();
    wait();
    m_terminate = false;
}

#ifdef Q_OS_WIN

static inline QString msgTerminated(int size)
{
    return QString::fromLatin1("Terminated with %1 bytes pending.").arg(size);
}

// Interruptible synchronous write function.
static inline bool overlappedSyncWrite(HANDLE file,
                                       const bool &terminateFlag,
                                       const char *data,
                                       DWORD size, DWORD *charsWritten,
                                       OVERLAPPED *overlapped,
                                       QString *errorMessage)
{
    if (WriteFile(file, data, size, charsWritten, overlapped))
        return true;
    const DWORD writeError = GetLastError();
    if (writeError != ERROR_IO_PENDING) {
        *errorMessage = QString::fromLatin1("WriteFile failed: %1").arg(winErrorMessage(writeError));
        return false;
    }
    // Wait for written or thread terminated
    const DWORD timeoutMS = 200;
    const unsigned maxAttempts = 20;
    DWORD wr = WaitForSingleObject(overlapped->hEvent, timeoutMS);
    for (unsigned n = 0; wr == WAIT_TIMEOUT && n < maxAttempts && !terminateFlag;
         wr = WaitForSingleObject(overlapped->hEvent, timeoutMS), n++);
    if (terminateFlag) {
        *errorMessage = msgTerminated(size);
        return false;
    }
    switch (wr) {
    case WAIT_OBJECT_0:
        break;
    case WAIT_TIMEOUT:
        *errorMessage = QString::fromLatin1("Write timed out.");
        return false;
    default:
        *errorMessage = QString::fromLatin1("Error while waiting for WriteFile results: %1").arg(winErrorMessage(GetLastError()));
        return false;
    }
    if (!GetOverlappedResult(file, overlapped, charsWritten, TRUE)) {
        *errorMessage = QString::fromLatin1("Error writing %1 bytes: %2").arg(size).arg(winErrorMessage(GetLastError()));
        return false;
    }
    return true;
}
#endif

bool WriterThread::write(const QByteArray &data, QString *errorMessage)
{
    if (verboseTrk)
        qDebug() << "Write raw data: " << stringFromArray(data).toLatin1();
    QMutexLocker locker(&m_context->mutex);
#ifdef Q_OS_WIN
    DWORD charsWritten;
    if (!overlappedSyncWrite(m_context->device, m_terminate, data.data(), data.size(), &charsWritten, &m_context->writeOverlapped, errorMessage)) {
        return false;
    }
    FlushFileBuffers(m_context->device);
    return true;
#else
    if (m_context->file.write(data) == -1 || !m_context->file.flush()) {
        *errorMessage = QString::fromLatin1("Cannot write: %1").arg(m_context->file.errorString());
        return false;
    }
    return  true;
#endif
}

bool WriterThread::trkWriteRawMessage(const TrkMessage &msg)
{
    const QByteArray ba = frameMessage(msg.code, msg.token, msg.data, m_context->serialFrame);
    QString errorMessage;
    const bool rc = write(ba, &errorMessage);
    if (!rc) {
        qWarning("%s\n", qPrintable(errorMessage));
        emit error(errorMessage);
    }
    return rc;
}

void WriterThread::tryWrite()
{
    m_waitCondition.wakeAll();
}

void WriterThread::queueTrkMessage(byte code, TrkCallback callback,
                                   const QByteArray &data, const QVariant &cookie)
{
    m_dataMutex.lock();
    m_queue.queueTrkMessage(code, callback, data, cookie);
    m_dataMutex.unlock();
    tryWrite();
}

void WriterThread::queueTrkInitialPing()
{
    m_dataMutex.lock();
    m_queue.queueTrkInitialPing();
    m_dataMutex.unlock();
    tryWrite();
}

// Call this from the device read notification with the results.
void WriterThread::slotHandleResult(const TrkResult &result)
{
    m_queue.slotHandleResult(result, &m_dataMutex);
    tryWrite(); // Have messages been enqueued in-between?
}


///////////////////////////////////////////////////////////////////////
//
// ReaderThreadBase: Base class for a thread that reads data from
// the device, decodes the messages and emit signals for the messages.
// A Qt::BlockingQueuedConnection should be used for the message signal
// to ensure messages are processed in the correct sequence.
//
///////////////////////////////////////////////////////////////////////

class ReaderThreadBase : public QThread
{
    Q_OBJECT
    Q_DISABLE_COPY(ReaderThreadBase)
public:

signals:
    void messageReceived(const trk::TrkResult &result, const QByteArray &rawData);

protected:
    explicit ReaderThreadBase(const QSharedPointer<DeviceContext> &context);
    void processData(const QByteArray &a);
    void processData(char c);

    const QSharedPointer<DeviceContext> m_context;

private:
    void readMessages();

    QByteArray m_trkReadBuffer;
};

ReaderThreadBase::ReaderThreadBase(const QSharedPointer<DeviceContext> &context) :
    m_context(context)
{
    static const int trkResultMetaId = qRegisterMetaType<trk::TrkResult>();
    Q_UNUSED(trkResultMetaId)
}

void ReaderThreadBase::processData(const QByteArray &a)
{
    m_trkReadBuffer += a;
    readMessages();
}

void ReaderThreadBase::processData(char c)
{
    m_trkReadBuffer += c;
    if (m_trkReadBuffer.size() > 1)
        readMessages();
}

void ReaderThreadBase::readMessages()
{
    TrkResult r;
    QByteArray rawData;
    while (extractResult(&m_trkReadBuffer, m_context->serialFrame, &r, &rawData)) {
        emit messageReceived(r, rawData);
    }
}

#ifdef Q_OS_WIN
///////////////////////////////////////////////////////////////////////
//
// WinReaderThread: A thread reading from the device using Windows API.
// Waits on an overlapped I/O handle and an event that tells the thread to
// terminate.
//
///////////////////////////////////////////////////////////////////////

class WinReaderThread : public ReaderThreadBase
{
    Q_OBJECT
    Q_DISABLE_COPY(WinReaderThread)
public:
    explicit WinReaderThread(const QSharedPointer<DeviceContext> &context);
    ~WinReaderThread();

    virtual void run();

signals:
    void error(const QString &);

public slots:
    void terminate();

private:
    enum Handles { FileHandle, TerminateEventHandle, HandleCount };

    inline int tryRead();

    HANDLE m_handles[HandleCount];
};

WinReaderThread::WinReaderThread(const QSharedPointer<DeviceContext> &context) :
    ReaderThreadBase(context)
{
    m_handles[FileHandle] = NULL;
    m_handles[TerminateEventHandle] = CreateEvent(NULL, FALSE, FALSE, NULL);
}

WinReaderThread::~WinReaderThread()
{
    CloseHandle(m_handles[TerminateEventHandle]);
}

// Return 0 to continue or error code
int WinReaderThread::tryRead()
{
    enum { BufSize = 1024 };
    char buffer[BufSize];
    // Check if there are already bytes waiting. If not, wait for first byte
    COMSTAT comStat;
    if (!ClearCommError(m_context->device, NULL, &comStat)){
        emit error(QString::fromLatin1("ClearCommError failed: %1").arg(winErrorMessage(GetLastError())));
        return -7;
    }    
    const DWORD bytesToRead = qMax(DWORD(1), qMin(comStat.cbInQue, DWORD(BufSize)));
    // Trigger read
    DWORD bytesRead = 0;
    if (ReadFile(m_context->device, &buffer, bytesToRead, &bytesRead, &m_context->readOverlapped)) {
        if (bytesRead == 1) {
            processData(buffer[0]);
        } else {
            processData(QByteArray(buffer, bytesRead));
        }
        return 0;
    }
    const DWORD readError = GetLastError();
    if (readError != ERROR_IO_PENDING) {
        emit error(QString::fromLatin1("Read error: %1").arg(winErrorMessage(readError)));
        return -1;
    }    
    // Wait for either termination or data
    const DWORD wr = WaitForMultipleObjects(HandleCount, m_handles, false, INFINITE);
    if (wr == WAIT_FAILED) {
        emit error(QString::fromLatin1("Wait failed: %1").arg(winErrorMessage(GetLastError())));
        return -2;
    }
    if (wr - WAIT_OBJECT_0 == TerminateEventHandle) {
        return 1; // Terminate
    }
    // Check data
    if (!GetOverlappedResult(m_context->device, &m_context->readOverlapped, &bytesRead, true)) {
        emit error(QString::fromLatin1("GetOverlappedResult failed: %1").arg(winErrorMessage(GetLastError())));
        return -3;
    }
    if (bytesRead == 1) {
        processData(buffer[0]);
    } else {
        processData(QByteArray(buffer, bytesRead));
    }
    return 0;
}

void WinReaderThread::run()
{
    m_handles[FileHandle] = m_context->readOverlapped.hEvent;
    while ( tryRead() == 0) ;
}

void WinReaderThread::terminate()
{
    SetEvent(m_handles[TerminateEventHandle]);
    wait();
}

typedef WinReaderThread ReaderThread;

#else

///////////////////////////////////////////////////////////////////////
//
// UnixReaderThread: A thread reading from the device.
// Uses select() to wait and a special ioctl() to find out the number
// of bytes queued. For clean termination, the self-pipe trick is used.
// The class maintains a pipe, on whose read end the select waits besides
// the device file handle. To terminate, a byte is written to the pipe.
//
///////////////////////////////////////////////////////////////////////

static inline QString msgUnixCallFailedErrno(const char *func, int errorNumber)
{
    return QString::fromLatin1("Call to %1() failed: %2").arg(QLatin1String(func), QString::fromLocal8Bit(strerror(errorNumber)));
}

class UnixReaderThread : public ReaderThreadBase {
    Q_OBJECT
    Q_DISABLE_COPY(UnixReaderThread)
public:
    explicit UnixReaderThread(const QSharedPointer<DeviceContext> &context);
    ~UnixReaderThread();

    virtual void run();

signals:
    void error(const QString &);

public slots:
    void terminate();

private:
    inline int tryRead();

    int m_terminatePipeFileDescriptors[2];
};

UnixReaderThread::UnixReaderThread(const QSharedPointer<DeviceContext> &context) : 
    ReaderThreadBase(context)
{
    m_terminatePipeFileDescriptors[0] = m_terminatePipeFileDescriptors[1] = -1;
    // Set up pipes for termination. Should not fail
    if (pipe(m_terminatePipeFileDescriptors) < 0)
        qWarning("%s\n", qPrintable(msgUnixCallFailedErrno("pipe", errno)));
}

UnixReaderThread::~UnixReaderThread()
{
    close(m_terminatePipeFileDescriptors[0]);
    close(m_terminatePipeFileDescriptors[1]);
}

int UnixReaderThread::tryRead()
{
    fd_set readSet, tempReadSet, tempExceptionSet;
    struct timeval timeOut;
    const int fileDescriptor = m_context->file.handle();
    FD_ZERO(&readSet);
    FD_SET(fileDescriptor, &readSet);
    FD_SET(m_terminatePipeFileDescriptors[0], &readSet);
    const int maxFileDescriptor = qMax(m_terminatePipeFileDescriptors[0], fileDescriptor);
    int result = 0;
    do {
        memcpy(&tempReadSet, &readSet, sizeof(fd_set));
        memcpy(&tempExceptionSet, &readSet, sizeof(fd_set));
        timeOut.tv_sec = 1;
        timeOut.tv_usec = 0;
        result = select(maxFileDescriptor + 1, &tempReadSet, NULL, &tempExceptionSet, &timeOut);
    } while ( result < 0 && errno == EINTR );
    // Timeout?
    if (result == 0)
        return 0;
   // Something wrong?
    if (result < 0) {
        emit error(msgUnixCallFailedErrno("select", errno));
        return -1;
    }
    // Did the exception set trigger on the device?
    if (FD_ISSET(fileDescriptor,&tempExceptionSet)) {
        emit error(QLatin1String("An Exception occurred on the device."));
        return -2;
    }
    // Check termination pipe.
    if (FD_ISSET(m_terminatePipeFileDescriptors[0], &tempReadSet)
        || FD_ISSET(m_terminatePipeFileDescriptors[0], &tempExceptionSet))
        return 1;

    // determine number of pending bytes and read
    int numBytes;
    if (ioctl(fileDescriptor, FIONREAD, &numBytes) < 0) {
        emit error(msgUnixCallFailedErrno("ioctl", errno));
        return -1;
    }
    m_context->mutex.lock();
    const QByteArray data = m_context->file.read(numBytes);
    m_context->mutex.unlock();
    processData(data);
    return 0;
}

void UnixReaderThread::run()
{
    // Read loop
    while (tryRead() == 0)
        ;
}

void UnixReaderThread::terminate()
{
    // Trigger select() by writing to the pipe
    char c = 0;
    const int written = write(m_terminatePipeFileDescriptors[1], &c, 1);
    Q_UNUSED(written)
    wait();
}

typedef UnixReaderThread ReaderThread;

#endif

///////////////////////////////////////////////////////////////////////
//
// TrkDevicePrivate
//
///////////////////////////////////////////////////////////////////////

struct TrkDevicePrivate
{
    TrkDevicePrivate();

    QSharedPointer<DeviceContext> deviceContext;
    QSharedPointer<WriterThread> writerThread;
    QSharedPointer<ReaderThread> readerThread;

    QByteArray trkReadBuffer;
    int verbose;
    QString errorString;
    QString port;
};

///////////////////////////////////////////////////////////////////////
//
// TrkDevice
//
///////////////////////////////////////////////////////////////////////

TrkDevicePrivate::TrkDevicePrivate() :
    deviceContext(new DeviceContext),
    verbose(0)
{
}

///////////////////////////////////////////////////////////////////////
//
// TrkDevice
//
///////////////////////////////////////////////////////////////////////

TrkDevice::TrkDevice(QObject *parent) :
    QObject(parent),
    d(new TrkDevicePrivate)
{}

TrkDevice::~TrkDevice()
{
    close();
    delete d;
}

bool TrkDevice::open(QString *errorMessage)
{
    if (d->verbose)
        qDebug() << "Opening" << port() << "is open: " << isOpen() << " serialFrame=" << serialFrame();
    if (d->port.isEmpty()) {
        *errorMessage = QLatin1String("Internal error: No port set on TrkDevice");
        return false;
    }

    close();
#ifdef Q_OS_WIN
    const QString fullPort = QLatin1String("\\\\.\\") + d->port;
    d->deviceContext->device = CreateFile(reinterpret_cast<const WCHAR*>(fullPort.utf16()),
                           GENERIC_READ | GENERIC_WRITE,
                           0,
                           NULL,
                           OPEN_EXISTING,
                           FILE_ATTRIBUTE_NORMAL|FILE_FLAG_NO_BUFFERING|FILE_FLAG_OVERLAPPED,
                           NULL);

    if (INVALID_HANDLE_VALUE == d->deviceContext->device) {
        *errorMessage = QString::fromLatin1("Could not open device '%1': %2").arg(port(), winErrorMessage(GetLastError()));
        return false;
    }
    memset(&d->deviceContext->readOverlapped, 0, sizeof(OVERLAPPED));
    d->deviceContext->readOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    memset(&d->deviceContext->writeOverlapped, 0, sizeof(OVERLAPPED));
    d->deviceContext->writeOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (d->deviceContext->readOverlapped.hEvent == NULL || d->deviceContext->writeOverlapped.hEvent == NULL) {
        *errorMessage = QString::fromLatin1("Failed to create events: %1").arg(winErrorMessage(GetLastError()));
        return false;
    }
#else
    d->deviceContext->file.setFileName(d->port);
    if (!d->deviceContext->file.open(QIODevice::ReadWrite|QIODevice::Unbuffered)) {
        *errorMessage = QString::fromLatin1("Cannot open %1: %2").arg(d->port, d->deviceContext->file.errorString());
        return false;
    }

    struct termios termInfo;
    if (tcgetattr(d->deviceContext->file.handle(), &termInfo) < 0) {
        *errorMessage = QString::fromLatin1("Unable to retrieve terminal settings: %1 %2").arg(errno).arg(QString::fromAscii(strerror(errno)));
        return false;
    }
    // Turn off terminal echo as not get messages back, among other things
    termInfo.c_cflag |= CREAD|CLOCAL;
    termInfo.c_lflag &= (~(ICANON|ECHO|ECHOE|ECHOK|ECHONL|ISIG));
    termInfo.c_iflag &= (~(INPCK|IGNPAR|PARMRK|ISTRIP|ICRNL|IXANY));
    termInfo.c_oflag &= (~OPOST);
    termInfo.c_cc[VMIN]  = 0;
    termInfo.c_cc[VINTR] = _POSIX_VDISABLE;
    termInfo.c_cc[VQUIT] = _POSIX_VDISABLE;
    termInfo.c_cc[VSTART] = _POSIX_VDISABLE;
    termInfo.c_cc[VSTOP] = _POSIX_VDISABLE;
    termInfo.c_cc[VSUSP] = _POSIX_VDISABLE;
    if (tcsetattr(d->deviceContext->file.handle(), TCSAFLUSH, &termInfo) < 0) {
        *errorMessage = QString::fromLatin1("Unable to apply terminal settings: %1 %2").arg(errno).arg(QString::fromAscii(strerror(errno)));
        return false;
    }
#endif
    d->readerThread = QSharedPointer<ReaderThread>(new ReaderThread(d->deviceContext));
    connect(d->readerThread.data(), SIGNAL(error(QString)), this, SLOT(emitError(QString)),
            Qt::QueuedConnection);
    connect(d->readerThread.data(), SIGNAL(messageReceived(trk::TrkResult,QByteArray)),
            this, SLOT(slotMessageReceived(trk::TrkResult,QByteArray)),
            Qt::QueuedConnection);
    d->readerThread->start();

    d->writerThread = QSharedPointer<WriterThread>(new WriterThread(d->deviceContext));
    connect(d->writerThread.data(), SIGNAL(error(QString)), this, SLOT(emitError(QString)),
            Qt::QueuedConnection);    
    d->writerThread->start();    

    if (d->verbose)
        qDebug() << "Opened" << d->port;
    return true;
}

void TrkDevice::close()
{
    if (!isOpen())
        return;
    if (d->readerThread)
        d->readerThread->terminate();
    if (d->writerThread)
        d->writerThread->terminate();
#ifdef Q_OS_WIN
    CloseHandle(d->deviceContext->device);
    d->deviceContext->device = INVALID_HANDLE_VALUE;
    CloseHandle(d->deviceContext->readOverlapped.hEvent);
    CloseHandle(d->deviceContext->writeOverlapped.hEvent);
    d->deviceContext->readOverlapped.hEvent = d->deviceContext->writeOverlapped.hEvent = NULL;
#else
    d->deviceContext->file.close();
#endif
    if (d->verbose)
        emitLogMessage("Close");
}

bool TrkDevice::isOpen() const
{
#ifdef Q_OS_WIN
    return d->deviceContext->device != INVALID_HANDLE_VALUE;
#else
    return d->deviceContext->file.isOpen();
#endif
}

QString TrkDevice::port() const
{
    return d->port;
}

void TrkDevice::setPort(const QString &p)
{
    d->port = p;
}

QString TrkDevice::errorString() const
{
    return d->errorString;
}

bool TrkDevice::serialFrame() const
{
    return d->deviceContext->serialFrame;
}

void TrkDevice::setSerialFrame(bool f)
{
    d->deviceContext->serialFrame = f;
}

int TrkDevice::verbose() const
{
    return d->verbose;
}

void TrkDevice::setVerbose(int b)
{
    d->verbose = b;
}

void TrkDevice::slotMessageReceived(const trk::TrkResult &result, const QByteArray &rawData)
{
    d->writerThread->slotHandleResult(result);
    if (d->verbose > 1)
        qDebug() << "Received: " << result.toString();
    emit messageReceived(result);    
    if (!rawData.isEmpty())
        emit rawDataReceived(rawData);
}

void TrkDevice::emitError(const QString &s)
{
    d->errorString = s;
    qWarning("%s\n", qPrintable(s));
    emit error(s);
}

void TrkDevice::sendTrkMessage(byte code, TrkCallback callback,
     const QByteArray &data, const QVariant &cookie)
{
    if (!d->writerThread.isNull()) {
        if (d->verbose > 1) {
            QByteArray msg = "Sending:  ";
            msg += QByteArray::number(code, 16);
            msg += ": ";
            msg += stringFromArray(data).toLatin1();
            qDebug("%s", msg.data());
        }
        d->writerThread->queueTrkMessage(code, callback, data, cookie);
    }
}

void TrkDevice::sendTrkInitialPing()
{
    if (!d->writerThread.isNull())
        d->writerThread->queueTrkInitialPing();
}

bool TrkDevice::sendTrkAck(byte token)
{
    if (d->writerThread.isNull())
        return false;
    // The acknowledgement must not be queued!
    TrkMessage msg(0x80, token);
    msg.token = token;
    msg.data.append('\0');
    if (verboseTrk)
        qDebug() << "Write synchroneous message: " << msg;
    return d->writerThread->trkWriteRawMessage(msg);
    // 01 90 00 07 7e 80 01 00 7d 5e 7e
}

void TrkDevice::emitLogMessage(const QString &msg)
{
    if (d->verbose)
        qDebug("%s\n", qPrintable(msg));
    emit logMessage(msg);
}

} // namespace trk

#include "trkdevice.moc"