COM3D2.MeidoPhotoStudio/src/MeidoPhotoStudio.Plugin/MPSScene.cs

using System.IO;
using System.Text;

using UnityEngine;

namespace MeidoPhotoStudio.Plugin;

public class MPSScene
{
    private byte[] data;

    public MPSScene(string path, Texture2D thumbnail = null)
    {
        FileInfo = new(path);

        if (!thumbnail)
        {
            thumbnail = new(1, 1, TextureFormat.ARGB32, false);
            thumbnail.LoadImage(File.ReadAllBytes(FileInfo.FullName));
        }

        Thumbnail = thumbnail;
    }

    public Texture2D Thumbnail { get; }

    public FileInfo FileInfo { get; }

    public bool Environment { get; private set; }

    public int NumberOfMaids { get; private set; }

    public byte[] Data
    {
        get
        {
            if (data is null)
                Preload();

            return data;
        }
        private set => data = value;
    }

    public void Preload()
    {
        if (data is not null)
            return;

        using var fileStream = FileInfo.OpenRead();

        Utility.SeekPngEnd(fileStream);

        using var memoryStream = new MemoryStream();

        fileStream.CopyTo(memoryStream);
        memoryStream.Position = 0L;

        using var binaryReader = new BinaryReader(memoryStream, Encoding.UTF8);

        var sceneHeader = MeidoPhotoStudio.SceneHeader;

        if (!Utility.BytesEqual(binaryReader.ReadBytes(sceneHeader.Length), sceneHeader))
        {
            Utility.LogWarning($"'{FileInfo.FullName}' is not a MPS Scene");

            return;
        }

        (_, Environment, NumberOfMaids, _) = SceneMetadata.ReadMetadata(binaryReader);

        Data = memoryStream.ToArray();
    }

    public void Destroy()
    {
        if (Thumbnail)
            Object.DestroyImmediate(Thumbnail);
    }
}