public long UnpackLong()
{
byte markerByte = _in.ReadByte();
if ((sbyte)markerByte >= MINUS_2_TO_THE_4)
{
return((sbyte)markerByte);
}
switch (markerByte)
{
case INT_8:
return(_in.ReadSByte());
case INT_16:
return(_in.ReadShort());
case INT_32:
return(_in.ReadInt());
case INT_64:
return(_in.ReadLong());
default:
throw new ArgumentOutOfRangeException(nameof(markerByte), markerByte,
$"Expected an integer, but got: 0x{markerByte.ToString("X2")}");
}
}