BinaryWriterHelper.cs

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using System.IO;
 
namespace Terraria.DataStructures;
 
public struct BinaryWriterHelper
{
    private long _placeInWriter;
 
    public void ReservePointToFillLengthLaterByFilling6Bytes(BinaryWriter writer)
    {
        _placeInWriter = writer.BaseStream.Position;
        writer.Write(0u);
        writer.Write((ushort)0);
    }
 
    public void FillReservedPoint(BinaryWriter writer, ushort dataId)
    {
        long position = writer.BaseStream.Position;
        writer.BaseStream.Position = _placeInWriter;
        long num = position - _placeInWriter - 4;
        writer.Write((int)num);
        writer.Write(dataId);
        writer.BaseStream.Position = position;
    }
 
    public void FillOnlyIfThereIsLengthOrRevertToSavedPosition(BinaryWriter writer, ushort dataId, out bool wroteSomething)
    {
        wroteSomething = false;
        long position = writer.BaseStream.Position;
        writer.BaseStream.Position = _placeInWriter;
        long num = position - _placeInWriter - 4;
        if (num != 0L)
        {
            writer.Write((int)num);
            writer.Write(dataId);
            writer.BaseStream.Position = position;
            wroteSomething = true;
        }
    }
}