[StructLayout(LayoutKind.Sequential)]
public partial class ChunkIdx1 : ChunkBase
{
    public uint EntryCount { get; set; } = 0;
    public uint EntryMax { get; set; } = 0;
    public Idx1Entry[] Entry { get; set; } = null;
}

public partial class ChunkIdx1
{
    public override ReadResult Read(Stream stream)
    {
        ReadResult result = BeginRead();
        if (result != ReadResult.Ok)
        {
            return result;
        }

        _ = stream.Read<byte>(8); // skip 8 bytes, fcc and size

        uint count  = (uint) Math.Min(Size, Size.Even() - 8);

        EntryCount = EntryMax = count;

        if (count > 0)
        {
            Entry = new Idx1Entry[count];

            foreach (Idx1Entry t in Entry)
            {
                t.Fcc = stream.Read<uint>();
                t.Flags = stream.Read<uint>();
                t.Position = stream.Read<uint>();
                t.Length = stream.Read<uint>();
            }
        }
        else
        {
            Entry = null;
        }

        Debug.WriteLine($"idx1: index entry: {count}", "INFO");

        return ReadResult.Ok;
    }
}