continuity/Wonderking/Game/Reader/BinaryReader.cs

// Copyright (c) 2023 Timothy Schenk. Subject to the GNU AGPL Version 3 License.

using System.Runtime.InteropServices;

namespace Wonderking.Game.Reader;

public static class BinaryReader<T> where T : new()
{
    public static readonly Func<BinaryReader, T> Read;

    static BinaryReader()
    {
        var type = typeof(T);

        if (type == typeof(bool))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, bool>)(p => p.ReadBoolean());
        }
        else if (type == typeof(char))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, char>)(p => p.ReadChar());
        }
        else if (type == typeof(string))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, string>)(p => p.ReadString());
        }
        else if (type == typeof(sbyte))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, sbyte>)(p => p.ReadSByte());
        }
        else if (type == typeof(short))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, short>)(p => p.ReadInt16());
        }
        else if (type == typeof(int))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, int>)(p => p.ReadInt32());
        }
        else if (type == typeof(long))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, long>)(p => p.ReadInt64());
        }
        else if (type == typeof(byte))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, byte>)(p => p.ReadByte());
        }
        else if (type == typeof(ushort))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, ushort>)(p => p.ReadUInt16());
        }
        else if (type == typeof(uint))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, uint>)(p => p.ReadUInt32());
        }
        else if (type == typeof(ulong))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, ulong>)(p => p.ReadUInt64());
        }
        else if (type == typeof(float))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, float>)(p => p.ReadSingle());
        }
        else if (type == typeof(double))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, double>)(p => p.ReadDouble());
        }
        else if (type == typeof(decimal))
        {
            Read = (Func<BinaryReader, T>)(Delegate)(Func<BinaryReader, decimal>)(p => p.ReadDecimal());
        }
        else
        {
            Read = (Func<BinaryReader, T>)(p =>
                (T)(object)p.ReadBytes(Marshal.SizeOf(new T())));
        }
    }
}