Found a bug where complete frames being removed from the buffer were being shorted by 1 character

Committing now with debug comments for future reference

connections/socketcand.cpp

@@ -32,6 +32,7 @@ SocketCANd::SocketCANd(QString portName) :
     for (int i = 0; i < mNumBuses; i++)
     {
         rx_state.append(IDLE);
+        unprocessedData.append("");
     }
 
 }
@@ -251,28 +252,23 @@ void SocketCANd::switchToRawMode(int busNum)
 
 QString SocketCANd::decodeFrames(QString data, int busNum)
 {
-    if (data.indexOf("< frame ") == -1)
-    {
-        //qDebug() << "Received datagramm doesn't contain any frame: " << data;
     if (data.indexOf("<") == -1)
         return "";
-        else
-            return data;
-    }
-    else
-    {
+    else if(data.length() >= 8 && data.indexOf("< frame ") == -1)
+        return "";
+
     int firstIndex = data.indexOf("< frame ");
     if(firstIndex > 0)
     {
         QString framePartial = data.left(firstIndex);
         qDebug() << "Received datagramm that starts with fragment (missing '< frame'), this should only occur on startup, removing...: " << framePartial;
     }
-        QString framePart = data.mid(firstIndex, data.length()); //remove starting beginning of payload if not < frame >
+    QString framePart = data.mid(firstIndex); //remove starting beginning of payload if not < frame >
     const QString frameStrConst = framePart.left(framePart.indexOf(">")+1);
     QString frameStr = frameStrConst;
     QStringList frameParsed = (frameStr.remove(QRegExp("^<")).remove(QRegExp(">$"))).simplified().split(' ');
 
-        if(frameParsed.length() < 2)
+    if(frameParsed.length() < 3)
     {
         //qDebug() << "Received datagramm is an incomplete frame: " << data;
 
@@ -332,11 +328,12 @@ QString SocketCANd::decodeFrames(QString data, int busNum)
     //take out the data that we just processed and anything that is in front of it
     //this should keep broken frames from accumulating at in the data buffer
     if (framePart.length() > frameStrConst.length())
+    {
         return decodeFrames(framePart.right(framePart.length() - frameStrConst.length()), busNum);
+    }
 
     return "";
 }
-}
 
 void SocketCANd::disconnectDevice() {
     for (int i = 0; i < tcpClient.length(); i++)
@@ -405,6 +402,7 @@ void SocketCANd::procRXData(QString data, int busNum)
         {
             switchToRawMode(busNum);
             rx_state[busNum] = SWITCHING2RAW;
+            unprocessedData[busNum].clear();
         }
         else qInfo() << hostCanIDs[busNum] << ": Could not open bus. Host did not respond with ""< ok >"": " << data;
         break;
@@ -418,29 +416,31 @@ void SocketCANd::procRXData(QString data, int busNum)
         {
             qDebug() << "Ok found at start of compound message, switching to RAW and decoding immediately";
             rx_state[busNum] = RAWMODE;
-            unprocessedData = decodeFrames(data, busNum);
+            unprocessedData[busNum] = decodeFrames(data, busNum);
         }
         else if(data.indexOf("< ok >", 0, Qt::CaseSensitivity::CaseInsensitive) > 0)
         {
             qDebug() << "Ok found at in middle of compound message, switching to RAW and decoding immediately";
             rx_state[busNum] = RAWMODE;
-            unprocessedData = decodeFrames(data, busNum);
+            unprocessedData[busNum] = decodeFrames(data, busNum);
         }
         break;
     case RAWMODE:
-        if(!unprocessedData.isEmpty())
-        {
-            //qDebug() << unprocessedData.length() << " bytes of unprocessedData: " << unprocessedData << " adding it to new data: " + data.left(50) + "...";
-        }
-        unprocessedData = decodeFrames(unprocessedData + data, busNum);
+        //if(!unprocessedData[busNum].isEmpty())
+        //{
+        //    qDebug() << "busNum: " << busNum << "- "  << unprocessedData[busNum].length() << " bytes of unprocessedData: " << unprocessedData[busNum] << " adding it to new data: " + data.left(50) + "...";
+       // }
+        unprocessedData[busNum] = decodeFrames(unprocessedData[busNum] + data, busNum);
+        //if(unprocessedData[busNum].length() > 0)
+        //    qDebug() << "busNum: " << busNum << " has data left over, what was at the end of the last packet?: " << data.right(20);
 
-        if(unprocessedData.length() > 128)
+        if(unprocessedData[busNum].length() > 128)
         {
             //the buffer has grown too much we need to clear it out, but what is good logic for that?
             //the decodeFrames function strips out datat that doesn't have a '< frame' starting token, and in its
             //recursive calling of itself it strips out data that preceedes valid frames, so this should never happen
-            qDebug() << unprocessedData.length() << " bytes in unprocessedData, something is wrong, clearing...";
-            unprocessedData.clear();
+            qDebug() << "busNum: " << busNum << "- " << unprocessedData[busNum].length() << " bytes in unprocessedData, something is wrong, clearing...";
+            unprocessedData[busNum].clear();
         }
         break;
     case ISOTP:

connections/socketcand.h

@@ -76,7 +76,7 @@ protected:
     QByteArray buildData;
     QVarLengthArray<MODE> rx_state;
     CANFrame buildFrame;
-    QString unprocessedData;
+    QVarLengthArray<QString> unprocessedData;
 };