Nerd_STF/Mathematics/BigInteger.cs

@@ -0,0 +1,100 @@
+using System.Numerics;
+
+namespace Nerd_STF.Mathematics;
+
+public readonly struct BigInteger/* : IAbsolute<BigInteger>, IAverage<BigInteger>, IClamp<BigInteger>, IDivide<BigInteger>,
+    ILerp<BigInteger, float>, IMathOperators<BigInteger>, IMax<BigInteger>, IMedian<BigInteger>, IMin<BigInteger>,
+    IPresets1d<BigInteger>, IProduct<BigInteger>, ISubtract<BigInteger>, ISum<BigInteger>*/
+{
+    public static BigInteger One => new(false, new byte[] { 1 });
+    public static BigInteger Zero => new(false, Array.Empty<byte>());
+
+    public int Sign => p_sign ? -1 : 1;
+
+    private readonly byte[] p_data;
+    private readonly bool p_sign;
+
+    private BigInteger(bool sign, byte[] data)
+    {
+        p_data = data;
+        p_sign = sign;
+    }
+    public BigInteger(byte val)
+    {
+        p_sign = false;
+        p_data = new byte[] { val };
+    }
+    public BigInteger(sbyte val)
+    {
+        p_sign = Math.Sign(val) < 0;
+        p_data = new byte[] { (byte)Math.Abs(val) };
+    }
+    public BigInteger(ushort val)
+    {
+        p_sign = false;
+        p_data = BitConverter.GetBytes(val);
+    }
+    public BigInteger(short val)
+    {
+        p_sign = Math.Sign(val) < 0;
+        p_data = BitConverter.GetBytes(Math.Abs(val));
+    }
+    public BigInteger(uint val)
+    {
+        p_sign = false;
+        p_data = BitConverter.GetBytes(val);
+    }
+    public BigInteger(int val)
+    {
+        p_sign = Math.Sign(val) < 0;
+        p_data = BitConverter.GetBytes(Math.Abs(val));
+    }
+    public BigInteger(ulong val)
+    {
+        p_sign = false;
+        p_data = BitConverter.GetBytes(val);
+    }
+    public BigInteger(long val)
+    {
+        p_sign = Math.Sign(val) < 0;
+        p_data = BitConverter.GetBytes(Math.Abs(val));
+    }
+
+    public byte[] GetAbsoluteData() => p_data;
+
+    public sbyte ToInt8()
+    {
+        byte[] data = GetDataOfSize(sizeof(sbyte));
+        sbyte absNum = (sbyte)data[0];
+        return p_sign ? (sbyte)-absNum : absNum;
+    }
+    public byte ToUInt8() => (byte)ToInt8();
+    public short ToInt16()
+    {
+        byte[] data = GetDataOfSize(sizeof(short));
+        short absNum = BitConverter.ToInt16(data);
+        return p_sign ? (short)-absNum : absNum;
+    }
+    public ushort ToUInt16() => (ushort)ToInt16();
+    public int ToInt32()
+    {
+        byte[] data = GetDataOfSize(sizeof(int));
+        int absNum = BitConverter.ToInt32(data);
+        return p_sign ? -absNum : absNum;
+    }
+    public uint ToUInt32() => (uint)ToInt32();
+    public long ToInt64()
+    {
+        byte[] data = GetDataOfSize(sizeof(long));
+        long absNum = BitConverter.ToInt64(data);
+        return p_sign ? -absNum : absNum;
+    }
+    public ulong ToUInt64() => (ulong)ToInt64();
+
+    private byte[] GetDataOfSize(int bytes)
+    {
+        byte[] data = new byte[bytes];
+        Array.Copy(p_data, data, Mathf.Min(p_data.Length, bytes));
+        return data;
+    }
+}