BitPacking.java

BitPacking.java

public class App
{

    public static void main(String[] args) throws Exception
    {
        for (byte art = 0; art < 24; art++)
        {
            for (byte data = 0; data < 4; data++)
            {
                byte packed = pack(art, data);
                byte uArt = getArt(packed);
                byte uData = getFacing(packed);
                System.out.println(packed);

                if (art != uArt || data != uData)
                {
                    throw new Exception("Inputted Art: " + art + " Data: " + data + " Got Art: " + uArt + " Data: " + uData);
                }
            }
        }
    }

    private static byte pack(byte art, byte facing)
    {
        if (facing >= 4)
        {
            throw new IllegalArgumentException("Facing must be between 0-3 inclusive");
        }
        if (art >= 32)
        {
            throw new IllegalArgumentException("Art must be between 0-31 inclusive");
        }
        return (byte) (facing << 5 | art);
    }

    private static byte getFacing(byte in)
    {
        return (byte) (in >> 5);
    }

    private static byte getArt(byte in)
    {
        return (byte) (in & ~0x60);
    }
}