From 3e64f9ef0322a02852640db82cbb5e0871d89209 Mon Sep 17 00:00:00 2001
From: Alex Barney <thealexbarney@gmail.com>
Date: Mon, 7 Mar 2022 14:08:05 -0700
Subject: [PATCH] Skeleton NcaFileSystemDriver

---
 src/LibHac/FsSystem/CompressedStorage.cs   |   6 +-
 src/LibHac/FsSystem/NcaFileSystemDriver.cs | 194 ++++++++++++++++++++-
 2 files changed, 195 insertions(+), 5 deletions(-)

diff --git a/src/LibHac/FsSystem/CompressedStorage.cs b/src/LibHac/FsSystem/CompressedStorage.cs
index ec0b819b..e8e16bd8 100644
--- a/src/LibHac/FsSystem/CompressedStorage.cs
+++ b/src/LibHac/FsSystem/CompressedStorage.cs
@@ -1,4 +1,5 @@
-using System;
+// ReSharper disable UnusedMember.Local NotAccessedField.Local
+using System;
 using System.Runtime.CompilerServices;
 using LibHac.Diag;
 using LibHac.Fs;
@@ -12,9 +13,6 @@ namespace LibHac.FsSystem;
 
 public class CompressedStorage : IStorage, IAsynchronousAccessSplitter
 {
-    public delegate Result DecompressorFunction(Span<byte> destination, ReadOnlySpan<byte> source);
-    public delegate DecompressorFunction GetDecompressorFunction(CompressionType type);
-
     public class CompressedStorageCore : IDisposable
     {
         private long _blockSizeMax;
diff --git a/src/LibHac/FsSystem/NcaFileSystemDriver.cs b/src/LibHac/FsSystem/NcaFileSystemDriver.cs
index adda8dae..0f651f37 100644
--- a/src/LibHac/FsSystem/NcaFileSystemDriver.cs
+++ b/src/LibHac/FsSystem/NcaFileSystemDriver.cs
@@ -1,5 +1,10 @@
-using LibHac.Common.FixedArrays;
+// ReSharper disable UnusedMember.Local
+using System;
+using LibHac.Common;
+using LibHac.Common.FixedArrays;
 using LibHac.Crypto;
+using LibHac.Fs;
+using LibHac.FsSrv;
 
 namespace LibHac.FsSystem;
 
@@ -60,4 +65,191 @@ public enum KeyType
     SaveDataDeviceUniqueMac = 0x62,
     SaveDataSeedUniqueMac = 0x63,
     SaveDataTransferMac = 0x64
+}
+
+public class NcaFileSystemDriver : IDisposable
+{
+    public struct StorageContext : IDisposable
+    {
+        public bool OpenRawStorage;
+        public SharedRef<IStorage> BodySubStorage;
+        public SharedRef<SparseStorage> CurrentSparseStorage;
+        public SharedRef<IStorage> SparseStorageMetaStorage;
+        public SharedRef<SparseStorage> OriginalSparseStorage;
+        // Todo: externalCurrentSparseStorage, externalOriginalSparseStorage
+        public SharedRef<IStorage> AesCtrExStorageMetaStorage;
+        public SharedRef<IStorage> AesCtrExStorageDataStorage;
+        public SharedRef<AesCtrCounterExtendedStorage> AesCtrExStorage;
+        public SharedRef<IStorage> IndirectStorageMetaStorage;
+        public SharedRef<IndirectStorage> IndirectStorage;
+        public SharedRef<IStorage> FsDataStorage;
+        public SharedRef<IStorage> CompressedStorageMetaStorage;
+        public SharedRef<CompressedStorage> CompressedStorage;
+
+        public void Dispose()
+        {
+            BodySubStorage.Destroy();
+            CurrentSparseStorage.Destroy();
+            SparseStorageMetaStorage.Destroy();
+            OriginalSparseStorage.Destroy();
+            AesCtrExStorageMetaStorage.Destroy();
+            AesCtrExStorageDataStorage.Destroy();
+            AesCtrExStorage.Destroy();
+            IndirectStorageMetaStorage.Destroy();
+            IndirectStorage.Destroy();
+            FsDataStorage.Destroy();
+            CompressedStorageMetaStorage.Destroy();
+            CompressedStorage.Destroy();
+        }
+    }
+
+    private enum AlignmentStorageRequirement
+    {
+        CacheBlockSize = 0,
+        None = 1
+    }
+
+    public NcaFileSystemDriver(ref SharedRef<NcaReader> ncaReader, MemoryResource allocator,
+        IBufferManager bufferManager, IHash256GeneratorFactorySelector hashGeneratorFactorySelector)
+    {
+        throw new NotImplementedException();
+    }
+
+    public NcaFileSystemDriver(ref SharedRef<NcaReader> originalNcaReader, ref SharedRef<NcaReader> currentNcaReader,
+        MemoryResource allocator, IBufferManager bufferManager,
+        IHash256GeneratorFactorySelector hashGeneratorFactorySelector)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void Dispose()
+    {
+        throw new NotImplementedException();
+    }
+
+    private bool IsUsingHwAesCtrForSpeedEmulation(FileSystemServer fs)
+    {
+        throw new NotImplementedException();
+    }
+
+    private long GetFsOffset(NcaReader reader, int index)
+    {
+        return (long)reader.GetFsOffset(index);
+    }
+
+    private long GetFsEndOffset(NcaReader reader, int index)
+    {
+        return (long)reader.GetFsEndOffset(index);
+    }
+
+    public Result OpenStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<IAsynchronousAccessSplitter> outStorageAccessSplitter, out NcaFsHeaderReader outHeaderReader,
+        int fsIndex)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result OpenStorageImpl(ref SharedRef<IStorage> outStorage, out NcaFsHeaderReader outHeaderReader,
+        int fsIndex, ref StorageContext storageContext)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result OpenIndirectableStorageAsOriginal(ref SharedRef<IStorage> outStorage,
+        in NcaFsHeaderReader headerReader, ref StorageContext storageContext)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateBodySubStorage(ref SharedRef<IStorage> outStorage, long offset, long size)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateAesCtrStorage(ref SharedRef<IStorage> outStorage, ref SharedRef<IStorage> baseStorage,
+        long offset, in NcaAesCtrUpperIv upperIv, AlignmentStorageRequirement alignmentRequirement)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateAesXtsStorage(ref SharedRef<IStorage> outStorage, ref SharedRef<IStorage> baseStorage,
+        long offset)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateSparseStorageMetaStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<IStorage> baseStorage, long offset, in NcaAesCtrUpperIv upperIv, in NcaSparseInfo sparseInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateSparseStorageCore(ref SharedRef<SparseStorage> outStorage, ref SharedRef<IStorage> baseStorage,
+        long baseStorageSize, ref SharedRef<IStorage> sparseStorageMetaStorage, in NcaSparseInfo sparseInfo,
+        bool hasExternalInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateSparseStorage(ref SharedRef<IStorage> outStorage, out long outFsDataOffset,
+        ref SharedRef<SparseStorage> outSparseStorage, ref SharedRef<IStorage> outSparseStorageMetaStorage, int index,
+        in NcaAesCtrUpperIv upperIv, in NcaSparseInfo sparseInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateAesCtrExStorageMetaStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<IStorage> baseStorage, long offset, in NcaAesCtrUpperIv upperIv, in NcaPatchInfo patchInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateAesCtrExStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<AesCtrCounterExtendedStorage> outAesCtrExStorage, ref SharedRef<IStorage> baseStorage,
+        ref SharedRef<IStorage> aesCtrExMetaStorage, long counterOffset, in NcaAesCtrUpperIv upperIv,
+        in NcaPatchInfo patchInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateIndirectStorageMetaStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<IStorage> baseStorage, in NcaPatchInfo patchInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateIndirectStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<IndirectStorage> outIndirectStorage, ref SharedRef<IStorage> baseStorage,
+        ref SharedRef<IStorage> originalDataStorage, ref SharedRef<IStorage> indirectStorageMetaStorage,
+        in NcaPatchInfo patchInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result CreateSha256Storage(ref SharedRef<IStorage> outStorage, ref SharedRef<IStorage> baseStorage,
+        in NcaFsHeader.HashData.HierarchicalSha256Data sha256Data)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Result HierarchicalSha256Data(ref SharedRef<IStorage> outStorage, ref SharedRef<IStorage> baseStorage,
+        in NcaFsHeader.HashData.IntegrityMetaInfo metaInfo)
+    {
+        throw new NotImplementedException();
+    }
+
+    public static Result CreateCompressedStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<CompressedStorage> outCompressedStorage, ref SharedRef<IStorage> outMetaStorage,
+        ref SharedRef<IStorage> baseStorage, in NcaCompressionInfo compressionInfo,
+        GetDecompressorFunction getDecompressor, MemoryResource allocator, IBufferManager bufferManager)
+    {
+        throw new NotImplementedException();
+    }
+
+    public Result CreateCompressedStorage(ref SharedRef<IStorage> outStorage,
+        ref SharedRef<CompressedStorage> outCompressedStorage, ref SharedRef<IStorage> outMetaStorage,
+        ref SharedRef<IStorage> baseStorage, in NcaCompressionInfo compressionInfo)
+    {
+        throw new NotImplementedException();
+    }
 }
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