-
Notifications
You must be signed in to change notification settings - Fork 287
/
blfhandler.cpp
176 lines (163 loc) · 8.29 KB
/
blfhandler.cpp
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
#include "blfhandler.h"
#include <QDebug>
#include <QFile>
#include <QString>
#include <QtEndian>
#define BLF_REMOTE_FLAG 0x80
BLFHandler::BLFHandler()
{
}
/*
Written while peeking at source code here:
https://python-can.readthedocs.io/en/latest/_modules/can/io/blf.html
https://bitbucket.org/tobylorenz/vector_blf/
All the code actually below is freshly written but heavily based upon things seen in those
two source repos.
*/
bool BLFHandler::loadBLF(QString filename, QVector<CANFrame>* frames)
{
BLF_OBJ_HEADER objHeader;
QByteArray fileData;
QByteArray uncompressedData;
QByteArray junk;
BLF_OBJECT obj;
uint32_t pos;
BLF_CAN_OBJ canObject;
BLF_CAN_OBJ2 canObject2;
QFile *inFile = new QFile(filename);
if (!inFile->open(QIODevice::ReadOnly))
{
delete inFile;
return false;
}
inFile->read((char *)&header, sizeof(header));
if (qFromLittleEndian(header.sig) == 0x47474F4C)
{
qDebug() << "Proper BLF file header token";
}
else return false;
while (!inFile->atEnd())
{
qDebug() << "Position within file: " << inFile->pos();
inFile->read((char *)&objHeader.base, sizeof(BLF_OBJ_HEADER_BASE));
if (qFromLittleEndian(objHeader.base.sig) == 0x4A424F4C)
{
int readSize = objHeader.base.objSize - sizeof(BLF_OBJ_HEADER_BASE);
qDebug() << "Proper object header token. Read Size: " << readSize;
fileData = inFile->read(readSize);
junk = inFile->read(readSize % 4); //file is padded so sizes must always end up on even multiple of 4
//qDebug() << "Fudge bytes in readSize: " << (readSize % 4);
switch (objHeader.base.objType)
{
case BLF_CONTAINER:
qDebug() << "Object is a container.";
memcpy(&objHeader.containerObj, fileData.constData(), sizeof(BLF_OBJ_HEADER_CONTAINER));
fileData.remove(0, sizeof(BLF_OBJ_HEADER_CONTAINER));
if (objHeader.containerObj.compressionMethod == BLF_CONT_NO_COMPRESSION)
{
qDebug() << "Container is not compressed";
uncompressedData = fileData;
}
else if (objHeader.containerObj.compressionMethod == BLF_CONT_ZLIB_COMPRESSION)
{
qDebug() << "Compressed container. Unpacking it.";
fileData.prepend(objHeader.containerObj.uncompressedSize & 0xFF);
fileData.prepend((objHeader.containerObj.uncompressedSize >> 8) & 0xFF);
fileData.prepend((objHeader.containerObj.uncompressedSize >> 16) & 0xFF);
fileData.prepend((objHeader.containerObj.uncompressedSize >> 24) & 0xFF);
uncompressedData += qUncompress(fileData);
}
else
{
qDebug() << "Dunno what this is... " << objHeader.containerObj.compressionMethod;
}
qDebug() << "Uncompressed size: " << uncompressedData.count();
qDebug() << "Currently loaded frames at this point: " << frames->count();
pos = 0;
//bool foundHeader = false;
//first skip forward to find a header signature - usually not necessary
while ( (int)(pos + sizeof(BLF_OBJ_HEADER)) < uncompressedData.count())
{
int32_t *headerSig = (int32_t *)(uncompressedData.constData() + pos);
if (*headerSig == 0x4A424F4C) break;
pos += 4;
}
//then process all the objects
while ( (int)(pos + sizeof(BLF_OBJ_HEADER)) < uncompressedData.count())
{
memcpy(&obj.header.base, (uncompressedData.constData() + pos), sizeof(BLF_OBJ_HEADER_BASE));
memcpy(&obj.header.v1Obj, (uncompressedData.constData() + pos) + sizeof(BLF_OBJ_HEADER_BASE), sizeof(BLF_OBJ_HEADER_V1));
//if (obj.header.base.objType != 1)
//qDebug() << "Pos: " << pos << " Type: " << obj.header.base.objType << "Obj Size: " << obj.header.base.objSize;
if (qFromLittleEndian(objHeader.base.sig) == 0x4A424F4C)
{
fileData = uncompressedData.mid(pos + sizeof(BLF_OBJ_HEADER_BASE) + sizeof(BLF_OBJ_HEADER_V1), obj.header.base.objSize - sizeof(BLF_OBJ_HEADER_BASE) - sizeof(BLF_OBJ_HEADER_V1));
if (obj.header.base.objType == BLF_CAN_MSG)
{
memcpy(&canObject, fileData.constData(), sizeof(BLF_CAN_OBJ));
CANFrame frame;
frame.bus = canObject.channel;
frame.setExtendedFrameFormat((canObject.id & 0x80000000ull)?true:false);
frame.setFrameId(canObject.id & 0x1FFFFFFFull);
frame.isReceived = true;
QByteArray bytes(canObject.dlc, 0);
if (canObject.flags & BLF_REMOTE_FLAG) {
frame.setFrameType(QCanBusFrame::RemoteRequestFrame);
} else {
frame.setFrameType(QCanBusFrame::DataFrame);
for (int i = 0; i < canObject.dlc; i++) bytes[i] = canObject.data[i];
}
frame.setPayload(bytes);
//Should we divide by a thousand or a million? Unsure here. It appears some logs are stamped in microseconds and some in milliseconds?
frame.setTimeStamp(QCanBusFrame::TimeStamp(0, obj.header.v1Obj.uncompSize / 1000.0)); //uncompsize field also used for timestamp oddly enough
frames->append(frame);
}
else if (obj.header.base.objType == BLF_CAN_MSG2)
{
memcpy(&canObject2, fileData.constData(), sizeof(BLF_CAN_OBJ2));
CANFrame frame;
frame.bus = canObject2.channel;
frame.setExtendedFrameFormat((canObject2.id & 0x80000000ull)?true:false);
frame.setFrameId(canObject2.id & 0x1FFFFFFFull);
frame.isReceived = true;
QByteArray bytes(canObject2.dlc, 0);
if (canObject2.flags & BLF_REMOTE_FLAG) {
frame.setFrameType(QCanBusFrame::RemoteRequestFrame);
} else {
frame.setFrameType(QCanBusFrame::DataFrame);
for (int i = 0; i < canObject2.dlc; i++) bytes[i] = canObject2.data[i];
}
frame.setPayload(bytes);
//Should we divide by a thousand or a million? Unsure here. It appears some logs are stamped in microseconds and some in milliseconds?
frame.setTimeStamp(QCanBusFrame::TimeStamp(0, obj.header.v1Obj.uncompSize / 1000.0)); //uncompsize field also used for timestamp oddly enough
frames->append(frame);
}
else
{
qDebug() << "Not a can frame! ObjType: " << obj.header.base.objType;
if (obj.header.base.objType > 0xFFFF)
return false;
}
pos += obj.header.base.objSize + (obj.header.base.objSize % 4);
}
else
{
qDebug() << "Unexpected object header signature, aborting";
return false;
}
}
uncompressedData.remove(0, pos);
qDebug() << "After removing used data uncompressedData is now this big: " << uncompressedData.count();
break;
}
}
else return false;
}
return true;
}
bool BLFHandler::saveBLF(QString filename, QVector<CANFrame> *frames)
{
Q_UNUSED(filename)
Q_UNUSED(frames)
return false;
}