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﻿using System;
using System.Runtime.InteropServices;
using System.Text;
namespace UnityDataTools.FileSystem;
internal class UnityArchiveHandle : SafeHandle
    public UnityArchiveHandle() : base(IntPtr.Zero, true)
    public override bool IsInvalid => handle == IntPtr.Zero;
    protected override bool ReleaseHandle()
        return DllWrapper.UnmountArchive(handle) == ReturnCode.Success;
internal class UnityFileHandle : SafeHandle
    public UnityFileHandle() : base(IntPtr.Zero, true)
    public override bool IsInvalid => handle == IntPtr.Zero;
    protected override bool ReleaseHandle()
        return DllWrapper.CloseFile(handle) == ReturnCode.Success;
internal class SerializedFileHandle : SafeHandle
    public SerializedFileHandle() : base(IntPtr.Zero, true)
    public override bool IsInvalid => handle == IntPtr.Zero;
    protected override bool ReleaseHandle()
        return DllWrapper.CloseSerializedFile(handle) == ReturnCode.Success;
internal class TypeTreeHandle : SafeHandle
    public TypeTreeHandle() : base(IntPtr.Zero, true)
    public override bool IsInvalid => handle == IntPtr.Zero;
    protected override bool ReleaseHandle()
        return true;
    internal IntPtr Handle => handle;
internal enum ReturnCode
    Success,
    AlreadyInitialized,
    NotInitialized,
    FileNotFound,
    FileFormatError,
    InvalidArgument,
    HigherSerializedFileVersion,
    DestinationBufferTooSmall,
    InvalidObjectId,
    UnknownError,
    FileError,
    ErrorCreatingArchiveFile,
    ErrorAddingFileToArchive,
    TypeNotFound,
public enum ArchiveNodeFlags
    None            = 0,
    Directory       = 1 << 0,
    Deleted         = 1 << 1,
    SerializedFile  = 1 << 2,
public enum CompressionType
public enum SeekOrigin
    Current,
public enum ExternalReferenceType
    NonAssetType,
    DeprecatedCachedAssetType,
    SerializedAssetType,
    MetaAssetType,
[StructLayout(LayoutKind.Sequential)]
public struct ObjectInfo
    public readonly long Id;
    public readonly long Offset;
    public readonly long Size;
    public readonly int TypeId;
public enum TypeTreeFlags
    IsArray                     = 1 << 0,
    IsManagedReference          = 1 << 1,
    IsManagedReferenceRegistry  = 1 << 2,
    IsArrayOfRefs               = 1 << 3,
public enum TypeTreeMetaFlags
    AlignBytes              = 1 << 14,
    AnyChildUsesAlignBytes  = 1 << 15,
internal static class DllWrapper
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_Init")]
    public static extern ReturnCode Init();
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_Cleanup")]
    public static extern ReturnCode Cleanup();
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_MountArchive")]
    public static extern ReturnCode MountArchive([MarshalAs(UnmanagedType.LPStr)] string path, [MarshalAs(UnmanagedType.LPStr)] string mountPoint, out UnityArchiveHandle handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_UnmountArchive")]
    public static extern ReturnCode UnmountArchive(IntPtr handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetArchiveNodeCount")]
    public static extern ReturnCode GetArchiveNodeCount(UnityArchiveHandle handle, out int count);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetArchiveNode")]
    public static extern ReturnCode GetArchiveNode(UnityArchiveHandle handle, int nodeIndex, StringBuilder path, int pathLen, out long size, out ArchiveNodeFlags flags);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_CreateArchive")]
    public static extern ReturnCode CreateArchive([MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr)] string[] sourceFiles,
        [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr)] string[] aliases, bool[] isSerializedFile, int count,
        [MarshalAs(UnmanagedType.LPStr)] string archiveFile, CompressionType compression, out int crc);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_OpenFile")]
    public static extern ReturnCode OpenFile([MarshalAs(UnmanagedType.LPStr)] string path, out UnityFileHandle handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl, EntryPoint = "UFS_ReadFile")]
    public static extern ReturnCode ReadFile(UnityFileHandle handle, long size,
        [MarshalAs(UnmanagedType.LPArray)] byte[] buffer, out long actualSize);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_SeekFile")]
    public static extern ReturnCode SeekFile(UnityFileHandle handle, long offset, SeekOrigin origin, out long newPosition);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetFileSize")]
    public static extern ReturnCode GetFileSize(UnityFileHandle handle, out long size);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_CloseFile")]
    public static extern ReturnCode CloseFile(IntPtr handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_OpenSerializedFile")]
    public static extern ReturnCode OpenSerializedFile([MarshalAs(UnmanagedType.LPStr)] string path, out SerializedFileHandle handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_CloseSerializedFile")]
    public static extern ReturnCode CloseSerializedFile(IntPtr handle);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetExternalReferenceCount")]
    public static extern ReturnCode GetExternalReferenceCount(SerializedFileHandle handle, out int count);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetExternalReference")]
    public static extern ReturnCode GetExternalReference(SerializedFileHandle handle, int index, StringBuilder path, int pathLen, StringBuilder guid, out ExternalReferenceType type);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetObjectCount")]
    public static extern ReturnCode GetObjectCount(SerializedFileHandle handle, out int count);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetObjectInfo")]
    public static extern ReturnCode GetObjectInfo(SerializedFileHandle handle, [In, Out] ObjectInfo[] objectData, int len);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetTypeTree")]
    public static extern ReturnCode GetTypeTree(SerializedFileHandle handle, long objectId, out TypeTreeHandle typeTree);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetRefTypeTypeTree")]
    public static extern ReturnCode GetRefTypeTypeTree(SerializedFileHandle handle, [MarshalAs(UnmanagedType.LPStr)] string className,
        [MarshalAs(UnmanagedType.LPStr)] string namespaceName, [MarshalAs(UnmanagedType.LPStr)] string assemblyName, out TypeTreeHandle typeTree);
    [DllImport("UnityFileSystemApi",
        CallingConvention = CallingConvention.Cdecl,
        EntryPoint = "UFS_GetTypeTreeNodeInfo")]
    public static extern ReturnCode GetTypeTreeNodeInfo(TypeTreeHandle handle, int node, StringBuilder type, int typeLen,
        StringBuilder name, int nameLen, out int offset, out int size, [MarshalAs(UnmanagedType.U4)] out TypeTreeFlags flags,
        [MarshalAs(UnmanagedType.U4)] out TypeTreeMetaFlags metaFlags, out int firstChildNode,
        out int nextNode);
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