protected override void Parse(ref BitStreamReader bsr)
{
EntryCount = bsr.ReadByte();
uint bitLen = DemoInfo.Game == SourceGame.PORTAL_1_1910503
? bsr.ReadVarUInt32()
: bsr.ReadUInt(DemoInfo.IsLeft4Dead2() ? 18 : 17);
_data = bsr.SplitAndSkip(bitLen);
// todo
}