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using System;

using System.IO;

namespace UnityDataTools.FileSystem;

// This is the main entry point. Provides methods to mount archives and open files.

public static class UnityFileSystem

{

public static void Init()

{

// Initialize the native library.

var r = DllWrapper.Init();

if (r != ReturnCode.Success && r != ReturnCode.AlreadyInitialized)

{

HandleErrors(r);

}

}

public static void Cleanup()

{

// Uninitialize the native library.

var r = DllWrapper.Cleanup();

if (r != ReturnCode.Success && r != ReturnCode.NotInitialized)

{

HandleErrors(r);

}

}

public static UnityArchive MountArchive(string path, string mountPoint)

{

var r = DllWrapper.MountArchive(path, mountPoint, out var handle);

HandleErrors(r, path);

return new UnityArchive() { m_Handle = handle };

}

public static UnityFile OpenFile(string path)

{

var r = DllWrapper.OpenFile(path, out var handle);

UnityFileSystem.HandleErrors(r, path);

return new UnityFile() { m_Handle = handle };

}

public static SerializedFile OpenSerializedFile(string path)

{

var r = DllWrapper.OpenSerializedFile(path, out var handle);

UnityFileSystem.HandleErrors(r, path);

return new SerializedFile() { m_Handle = handle };

}

internal static void HandleErrors(ReturnCode returnCode, string filename = "")

{

switch (returnCode)

{

case ReturnCode.AlreadyInitialized:

throw new InvalidOperationException("UnityFileSystem is already initialized.");

case ReturnCode.NotInitialized:

throw new InvalidOperationException("UnityFileSystem is not initialized.");

case ReturnCode.FileNotFound:

throw new FileNotFoundException("File not found.", filename);

case ReturnCode.FileFormatError:

throw new NotSupportedException($"Invalid file format reading {filename}.");

case ReturnCode.InvalidArgument:

throw new ArgumentException();

case ReturnCode.HigherSerializedFileVersion:

throw new NotSupportedException("SerializedFile version not supported.");

case ReturnCode.DestinationBufferTooSmall:

throw new ArgumentException("Destination buffer too small.");

case ReturnCode.InvalidObjectId:

throw new ArgumentException("Invalid object id.");

case ReturnCode.UnknownError:

throw new Exception("Unknown error.");

case ReturnCode.FileError:

throw new IOException("File operation error.");

case ReturnCode.TypeNotFound:

throw new ArgumentException("Type not found.");

}

}

}