pkNX/pkNX.Structures/Evolution/ZukanEvolutionTable.cs

using System;
using System.IO;
using System.Linq;

namespace pkNX.Structures
{
    public sealed class ZukanEvolutionTable
    {
        private const int SIZE = 0x14;
        private readonly ushort[][] Table;

        public ZukanEvolutionTable(byte[] data)
        {
            if (data.Length % SIZE != 0)
                throw new ArgumentException(nameof(data) + " length should be a multiple of " + SIZE);

            Table = new ushort[data.Length / SIZE][];
            for (int i = 0; i < Table.Length; i++)
            {
                var evos = new ushort[(SIZE / 2) - 1];
                for (int j = 0; j < evos.Length; j++)
                    evos[i] = BitConverter.ToUInt16(data, (i * SIZE) + (j * 2));
            }
        }

        public byte[] Write()
        {
            using var ms = new MemoryStream();
            using var bw = new BinaryWriter(ms);
            foreach (var t in Table)
            {
                foreach (var e in t)
                    bw.Write(e);
                bw.Write(t.Count(x => x != 0));
            }
            return ms.ToArray();
        }
    }
}