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using LibHac;
using LibHac.Common;
using LibHac.Common.Keys;
using LibHac.Fs;
using LibHac.FsSrv.Impl;
using LibHac.FsSrv.Sf;
using LibHac.FsSystem;
using LibHac.Spl;
using LibHac.Tools.Es;
using LibHac.Tools.Fs;
using LibHac.Tools.FsSystem;
using LibHac.Tools.FsSystem.NcaUtils;
using System;
using System.IO;
using System.Runtime.InteropServices;
using Path = System.IO.Path;
namespace Ryujinx.HLE.HOS.Services.Fs.FileSystemProxy
{
static class FileSystemProxyHelper
{
public static ResultCode OpenNsp(ServiceCtx context, string pfsPath, out IFileSystem openedFileSystem)
{
openedFileSystem = null;
try
{
LocalStorage storage = new LocalStorage(pfsPath, FileAccess.Read, FileMode.Open);
using SharedRef<LibHac.Fs.Fsa.IFileSystem> nsp = new(new PartitionFileSystem(storage));
ImportTitleKeysFromNsp(nsp.Get, context.Device.System.KeySet);
using SharedRef<LibHac.FsSrv.Sf.IFileSystem> adapter = FileSystemInterfaceAdapter.CreateShared(ref nsp.Ref, true);
openedFileSystem = new IFileSystem(ref adapter.Ref);
}
catch (HorizonResultException ex)
{
return (ResultCode)ex.ResultValue.Value;
}
return ResultCode.Success;
}
public static ResultCode OpenNcaFs(ServiceCtx context, string ncaPath, LibHac.Fs.IStorage ncaStorage, out IFileSystem openedFileSystem)
{
openedFileSystem = null;
try
{
Nca nca = new Nca(context.Device.System.KeySet, ncaStorage);
if (!nca.SectionExists(NcaSectionType.Data))
{
return ResultCode.PartitionNotFound;
}
LibHac.Fs.Fsa.IFileSystem fileSystem = nca.OpenFileSystem(NcaSectionType.Data, context.Device.System.FsIntegrityCheckLevel);
using var sharedFs = new SharedRef<LibHac.Fs.Fsa.IFileSystem>(fileSystem);
using SharedRef<LibHac.FsSrv.Sf.IFileSystem> adapter = FileSystemInterfaceAdapter.CreateShared(ref sharedFs.Ref, true);
openedFileSystem = new IFileSystem(ref adapter.Ref);
}
catch (HorizonResultException ex)
{
return (ResultCode)ex.ResultValue.Value;
}
return ResultCode.Success;
}
public static ResultCode OpenFileSystemFromInternalFile(ServiceCtx context, string fullPath, out IFileSystem openedFileSystem)
{
openedFileSystem = null;
DirectoryInfo archivePath = new DirectoryInfo(fullPath).Parent;
while (string.IsNullOrWhiteSpace(archivePath.Extension))
{
archivePath = archivePath.Parent;
}
if (archivePath.Extension == ".nsp" && File.Exists(archivePath.FullName))
{
FileStream pfsFile = new FileStream(
archivePath.FullName.TrimEnd(Path.DirectorySeparatorChar),
FileMode.Open,
FileAccess.Read);
try
{
PartitionFileSystem nsp = new PartitionFileSystem(pfsFile.AsStorage());
ImportTitleKeysFromNsp(nsp, context.Device.System.KeySet);
string filename = fullPath.Replace(archivePath.FullName, string.Empty).TrimStart('\\');
using var ncaFile = new UniqueRef<LibHac.Fs.Fsa.IFile>();
Result result = nsp.OpenFile(ref ncaFile.Ref, filename.ToU8Span(), OpenMode.Read);
if (result.IsFailure())
{
return (ResultCode)result.Value;
}
return OpenNcaFs(context, fullPath, ncaFile.Release().AsStorage(), out openedFileSystem);
}
catch (HorizonResultException ex)
{
return (ResultCode)ex.ResultValue.Value;
}
}
return ResultCode.PathDoesNotExist;
}
public static void ImportTitleKeysFromNsp(LibHac.Fs.Fsa.IFileSystem nsp, KeySet keySet)
{
foreach (DirectoryEntryEx ticketEntry in nsp.EnumerateEntries("/", "*.tik"))
{
using var ticketFile = new UniqueRef<LibHac.Fs.Fsa.IFile>();
Result result = nsp.OpenFile(ref ticketFile.Ref, ticketEntry.FullPath.ToU8Span(), OpenMode.Read);
if (result.IsSuccess())
{
Ticket ticket = new Ticket(ticketFile.Get.AsStream());
var titleKey = ticket.GetTitleKey(keySet);
if (titleKey != null)
{
keySet.ExternalKeySet.Add(new RightsId(ticket.RightsId), new AccessKey(titleKey));
}
}
}
}
public static ref readonly FspPath GetFspPath(ServiceCtx context, int index = 0)
{
ulong position = context.Request.PtrBuff[index].Position;
ulong size = context.Request.PtrBuff[index].Size;
ReadOnlySpan<byte> buffer = context.Memory.GetSpan(position, (int)size);
ReadOnlySpan<FspPath> fspBuffer = MemoryMarshal.Cast<byte, FspPath>(buffer);
return ref fspBuffer[0];
}
public static ref readonly LibHac.FsSrv.Sf.Path GetSfPath(ServiceCtx context, int index = 0)
{
ulong position = context.Request.PtrBuff[index].Position;
ulong size = context.Request.PtrBuff[index].Size;
ReadOnlySpan<byte> buffer = context.Memory.GetSpan(position, (int)size);
ReadOnlySpan<LibHac.FsSrv.Sf.Path> pathBuffer = MemoryMarshal.Cast<byte, LibHac.FsSrv.Sf.Path>(buffer);
return ref pathBuffer[0];
}
}
}
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