FileMetadata.cs

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using System;
using System.IO;
 
namespace Terraria.IO;
 
public class FileMetadata
{
    public const ulong MAGIC_NUMBER = 27981915666277746uL;
 
    public const int SIZE = 20;
 
    public FileType Type;
 
    public uint Revision;
 
    public bool IsFavorite;
 
    private FileMetadata()
    {
    }
 
    public void Write(BinaryWriter writer)
    {
        writer.Write(0x6369676F6C6572uL | ((ulong)Type << 56));
        writer.Write(Revision);
        writer.Write((ulong)(int)(((uint)IsFavorite.ToInt() & 1u) | 0u));
    }
 
    public void IncrementAndWrite(BinaryWriter writer)
    {
        Revision++;
        Write(writer);
    }
 
    public static FileMetadata FromCurrentSettings(FileType type)
    {
        return new FileMetadata
        {
            Type = type,
            Revision = 0u,
            IsFavorite = false
        };
    }
 
    public static FileMetadata Read(BinaryReader reader, FileType expectedType)
    {
        FileMetadata fileMetadata = new FileMetadata();
        fileMetadata.Read(reader);
        if (fileMetadata.Type != expectedType)
        {
            throw new FormatException("Expected type \"" + Enum.GetName(typeof(FileType), expectedType) + "\" but found \"" + Enum.GetName(typeof(FileType), fileMetadata.Type) + "\".");
        }
        return fileMetadata;
    }
 
    private void Read(BinaryReader reader)
    {
        ulong num = reader.ReadUInt64();
        if ((num & 0xFFFFFFFFFFFFFFL) != 27981915666277746L)
        {
            throw new FormatException("Expected Re-Logic file format.");
        }
        byte b = (byte)((num >> 56) & 0xFF);
        FileType fileType = FileType.None;
        FileType[] array = (FileType[])Enum.GetValues(typeof(FileType));
        for (int i = 0; i < array.Length; i++)
        {
            if ((uint)array[i] == b)
            {
                fileType = array[i];
                break;
            }
        }
        if (fileType == FileType.None)
        {
            throw new FormatException("Found invalid file type.");
        }
        Type = fileType;
        Revision = reader.ReadUInt32();
        ulong num2 = reader.ReadUInt64();
        IsFavorite = (num2 & 1) == 1;
    }
}