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blfhandler.cpp
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#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];
}
//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;
}