KErrOverflow:HBufC8* txtFile = HBufC8::NewLC(stream, stream.Source()->SizeL()) ;

   RFileReadStream stream;

   stream.Open(aFs, aFilename,EFileRead);

   TInt iSize = stream.Source()->SizeL();
   
   HBufC8* txtFile = HBufC8::NewLC(stream, iSize) ;     // ceci cause un "buffer overflow"

   stream.Close() ;