1 /*
2   ==============================================================================
3 
4    This file is part of the JUCE library.
5    Copyright (c) 2020 - Raw Material Software Limited
6 
7    JUCE is an open source library subject to commercial or open-source
8    licensing.
9 
10    The code included in this file is provided under the terms of the ISC license
11    http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12    To use, copy, modify, and/or distribute this software for any purpose with or
13    without fee is hereby granted provided that the above copyright notice and
14    this permission notice appear in all copies.
15 
16    JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17    EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18    DISCLAIMED.
19 
20   ==============================================================================
21 */
22 
23 namespace juce
24 {
25     class BlockSerialReader
26         : private MIDIDeviceConnection::Listener,
27           private Timer
28     {
29     public:
30         //==============================================================================
BlockSerialReader(MIDIDeviceConnection & deviceConnectionToUse)31         BlockSerialReader (MIDIDeviceConnection& deviceConnectionToUse) : deviceConnection (deviceConnectionToUse)
32         {
33             deviceConnection.addListener (this);
34             startTimer (10);
35         }
36 
~BlockSerialReader()37         ~BlockSerialReader() override
38         {
39             deviceConnection.removeListener (this);
40         }
41 
hasSerial() const42         bool hasSerial() const { return serial.isNotEmpty(); }
43 
getSerial() const44         String getSerial() const { return serial; }
45 
46     private:
47         MIDIDeviceConnection& deviceConnection;
48         String serial;
49 
shouldStop()50         bool shouldStop() { return hasSerial(); }
51 
52         //==============================================================================
timerCallback()53         void timerCallback() override
54         {
55             if (shouldStop())
56             {
57                 stopTimer();
58                 return;
59             }
60 
61             sendRequest();
62             startTimer (300);
63         }
64 
sendRequest()65         void sendRequest()
66         {
67             const uint8 dumpRequest[] = { 0xf0, 0x00, 0x21, 0x10, 0x78, 0x3f, 0xf7 };
68             deviceConnection.sendMessageToDevice (dumpRequest, sizeof (dumpRequest));
69         }
70 
handleIncomingMidiMessage(const MidiMessage & message)71         void handleIncomingMidiMessage (const MidiMessage& message) override
72         {
73             if (hasSerial())
74                 return;
75 
76             if (isResponse (message))
77                 parseResponse (message);
78         }
79 
connectionBeingDeleted(const MIDIDeviceConnection &)80         void connectionBeingDeleted (const MIDIDeviceConnection&) override
81         {
82             stopTimer();
83         }
84 
isResponse(const MidiMessage message)85         bool isResponse (const MidiMessage message)
86         {
87             const uint8 roliDumpHeader[] = { 0xf0, 0x00, 0x21, 0x10, 0x78};
88             return memcmp (message.getRawData(), roliDumpHeader, sizeof (roliDumpHeader)) == 0;
89         }
90 
parseResponse(const MidiMessage & message)91         void parseResponse (const MidiMessage& message)
92         {
93             int index = findMacAddressStart (message);
94 
95             if (index >= 0)
96             {
97                 const int macSize = 17;
98                 const int offset = index + macSize;
99                 const int serialSize = 16;
100 
101                 if (message.getRawDataSize() - offset < serialSize)
102                 {
103                     jassertfalse;
104                     return;
105                 }
106 
107                 serial = String ((const char*)message.getRawData() + offset, serialSize);
108             }
109         }
110 
findMacAddressStart(const MidiMessage & message)111         int findMacAddressStart (const MidiMessage& message)
112         {
113             const uint8 macStart[] = { '4', '8', ':', 'B', '6', ':', '2', '0', ':' };
114             return findSequence (macStart, sizeof (macStart), message);
115         }
116 
findSequence(const uint8 * sequence,int sequenceSize,const MidiMessage & message)117         int findSequence (const uint8* sequence, int sequenceSize, const MidiMessage& message)
118         {
119             for (int i = 0; i < message.getRawDataSize() - sequenceSize; i++)
120             {
121                 if (memcmp (message.getRawData() + i, sequence, size_t (sequenceSize)) == 0)
122                     return i;
123             }
124 
125             return -1;
126         }
127 
128         JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BlockSerialReader)
129     };
130 }
131