public static int Ebml_Read_Uint(this BinaryReader reader, int size, out ulong number)
{
int n = 0;
if (size > 8)
throw new ArgumentException("Invalid size");
number = 0;
while (n++ < size)
{
byte b = reader.ReadByte();
number = (number << 8) | b;
}
return 0;
}