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using LibHac;
using LibHac.Common;
using LibHac.Fs;
using System;
using System.IO;
namespace Ryujinx.HLE.HOS.Services.Fs.FileSystemProxy
{
class LazyFile : LibHac.Fs.Fsa.IFile
{
private readonly LibHac.Fs.Fsa.IFileSystem _fs;
private readonly string _filePath;
private readonly UniqueRef<LibHac.Fs.Fsa.IFile> _fileReference = new();
private readonly FileInfo _fileInfo;
public LazyFile(string filePath, string prefix, LibHac.Fs.Fsa.IFileSystem fs)
{
_fs = fs;
_filePath = filePath;
_fileInfo = new FileInfo(prefix + "/" + filePath);
}
private void PrepareFile()
{
if (_fileReference.Get == null)
{
_fs.OpenFile(ref _fileReference.Ref, _filePath.ToU8Span(), OpenMode.Read).ThrowIfFailure();
}
}
protected override Result DoRead(out long bytesRead, long offset, Span<byte> destination, in ReadOption option)
{
PrepareFile();
return _fileReference.Get!.Read(out bytesRead, offset, destination);
}
protected override Result DoWrite(long offset, ReadOnlySpan<byte> source, in WriteOption option)
{
throw new NotSupportedException();
}
protected override Result DoFlush()
{
throw new NotSupportedException();
}
protected override Result DoSetSize(long size)
{
throw new NotSupportedException();
}
protected override Result DoGetSize(out long size)
{
size = _fileInfo.Length;
return Result.Success;
}
protected override Result DoOperateRange(Span<byte> outBuffer, OperationId operationId, long offset, long size, ReadOnlySpan<byte> inBuffer)
{
throw new NotSupportedException();
}
}
}
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