Add ConcatenationFileSystem writing

src/LibHac.Nand/FatFileSystemProvider.cs

@@ -75,6 +75,13 @@ namespace LibHac.Nand
             return Fs.GetAttributes(path);
         }
 
+        public void SetFileAttributes(string path, FileAttributes attributes)
+        {
+            path = ToDiscUtilsPath(PathTools.Normalize(path));
+
+            Fs.SetAttributes(path, attributes);
+        }
+
         public long GetFileSize(string path)
         {
             path = ToDiscUtilsPath(PathTools.Normalize(path));
@@ -83,9 +90,9 @@ namespace LibHac.Nand
         }
 
         public void Commit() { }
-        
+
         public void CreateDirectory(string path) => throw new NotSupportedException();
-        public void CreateFile(string path, long size) => throw new NotSupportedException();
+        public void CreateFile(string path, long size, CreateFileOptions options) => throw new NotSupportedException();
         public void RenameDirectory(string srcPath, string dstPath) => throw new NotSupportedException();
         public void RenameFile(string srcPath, string dstPath) => throw new NotSupportedException();
 

src/LibHac/IO/AesXtsFileSystem.cs

@@ -31,7 +31,7 @@ namespace LibHac.IO
             BaseFileSystem.CreateDirectory(path);
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             throw new NotImplementedException();
         }

src/LibHac/IO/ConcatenationDirectory.cs

@@ -33,7 +33,7 @@ namespace LibHac.IO
                 }
                 else
                 {
-                    long size = ParentFileSystem.GetSplitFileSize(entry.FullPath);
+                    long size = ParentFileSystem.GetConcatenationFileSize(entry.FullPath);
                     yield return new DirectoryEntry(entry.Name, entry.FullPath, DirectoryEntryType.File, size);
                 }
             }

src/LibHac/IO/ConcatenationFile.cs

@@ -54,7 +54,26 @@ namespace LibHac.IO
 
         public override void Write(ReadOnlySpan<byte> source, long offset)
         {
-            throw new NotImplementedException();
+            ValidateWriteParams(source, offset);
+
+            long inPos = offset;
+            int outPos = 0;
+            int remaining = source.Length;
+
+            while (remaining > 0)
+            {
+                int fileIndex = GetFileIndexFromOffset(offset);
+                IFile file = Sources[fileIndex];
+                long fileOffset = offset - fileIndex * SplitFileSize;
+
+                long fileEndOffset = Math.Min((fileIndex + 1) * SplitFileSize, GetSize());
+                int bytesToWrite = (int)Math.Min(fileEndOffset - inPos, remaining);
+                file.Write(source.Slice(outPos, bytesToWrite), fileOffset);
+
+                outPos += bytesToWrite;
+                inPos += bytesToWrite;
+                remaining -= bytesToWrite;
+            }
         }
 
         public override void Flush()

src/LibHac/IO/ConcatenationFileSystem.cs

@@ -6,12 +6,16 @@ namespace LibHac.IO
 {
     public class ConcatenationFileSystem : IFileSystem
     {
+        private const long DefaultSplitFileSize = 0xFFFF0000; // Hard-coded value used by FS
         private IAttributeFileSystem BaseFileSystem { get; }
-        private long SplitFileSize { get; } = 0xFFFF0000; // Hard-coded value used by FS
+        private long SplitFileSize { get; }
 
-        public ConcatenationFileSystem(IAttributeFileSystem baseFileSystem)
+        public ConcatenationFileSystem(IAttributeFileSystem baseFileSystem) : this(baseFileSystem, DefaultSplitFileSize) { }
+
+        public ConcatenationFileSystem(IAttributeFileSystem baseFileSystem, long splitFileSize)
         {
             BaseFileSystem = baseFileSystem;
+            SplitFileSize = splitFileSize;
         }
 
         internal bool IsSplitFile(string path)
@@ -23,22 +27,78 @@ namespace LibHac.IO
 
         public void CreateDirectory(string path)
         {
-            throw new NotImplementedException();
+            path = PathTools.Normalize(path);
+
+            if (FileExists(path))
+            {
+                throw new IOException("Cannot create directory because a file with this name already exists.");
+            }
+
+            BaseFileSystem.CreateDirectory(path);
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
-            throw new NotImplementedException();
+            path = PathTools.Normalize(path);
+
+            CreateFileOptions newOptions = options & ~CreateFileOptions.CreateConcatenationFile;
+
+            if (!options.HasFlag(CreateFileOptions.CreateConcatenationFile))
+            {
+                BaseFileSystem.CreateFile(path, size, newOptions);
+                return;
+            }
+
+            // A concatenation file directory can't contain normal files
+            string parentDir = PathTools.GetParentDirectory(path);
+            if (IsSplitFile(parentDir)) throw new IOException("Cannot create files inside of a concatenation file");
+
+            BaseFileSystem.CreateDirectory(path);
+            FileAttributes attributes = BaseFileSystem.GetFileAttributes(path) | FileAttributes.Archive;
+            BaseFileSystem.SetFileAttributes(path, attributes);
+
+            long remaining = size;
+
+            for (int i = 0; remaining > 0; i++)
+            {
+                long fileSize = Math.Min(SplitFileSize, remaining);
+                string fileName = GetSplitFilePath(path, i);
+
+                BaseFileSystem.CreateFile(fileName, fileSize, CreateFileOptions.None);
+
+                remaining -= fileSize;
+            }
         }
 
         public void DeleteDirectory(string path)
         {
-            throw new NotImplementedException();
+            path = PathTools.Normalize(path);
+
+            if (IsSplitFile(path))
+            {
+                throw new DirectoryNotFoundException(path);
+            }
+
+            BaseFileSystem.DeleteDirectory(path);
         }
 
         public void DeleteFile(string path)
         {
-            throw new NotImplementedException();
+            path = PathTools.Normalize(path);
+
+            if (!IsSplitFile(path))
+            {
+                BaseFileSystem.DeleteFile(path);
+            }
+
+            int count = GetSplitFileCount(path);
+
+            for (int i = 0; i < count; i++)
+            {
+                BaseFileSystem.DeleteFile(GetSplitFilePath(path, i));
+            }
+
+            BaseFileSystem.DeleteDirectory(path);
         }
 
         public IDirectory OpenDirectory(string path, OpenDirectoryMode mode)
@@ -151,7 +211,7 @@ namespace LibHac.IO
             return $"{dirPath}/{index:D2}";
         }
 
-        internal long GetSplitFileSize(string path)
+        internal long GetConcatenationFileSize(string path)
         {
             int fileCount = GetSplitFileCount(path);
             long size = 0;

src/LibHac/IO/FileSystemExtensions.cs

@@ -11,7 +11,7 @@ namespace LibHac.IO
 {
     public static class FileSystemExtensions
     {
-        public static void CopyDirectory(this IDirectory source, IDirectory dest, IProgressReport logger = null)
+        public static void CopyDirectory(this IDirectory source, IDirectory dest, IProgressReport logger = null, CreateFileOptions options = CreateFileOptions.None)
         {
             IFileSystem sourceFs = source.ParentFileSystem;
             IFileSystem destFs = dest.ParentFileSystem;
@@ -27,12 +27,12 @@ namespace LibHac.IO
                     IDirectory subSrcDir = sourceFs.OpenDirectory(subSrcPath, OpenDirectoryMode.All);
                     IDirectory subDstDir = destFs.OpenDirectory(subDstPath, OpenDirectoryMode.All);
 
-                    subSrcDir.CopyDirectory(subDstDir, logger);
+                    subSrcDir.CopyDirectory(subDstDir, logger, options);
                 }
 
                 if (entry.Type == DirectoryEntryType.File)
                 {
-                    destFs.CreateFile(subDstPath, entry.Size);
+                    destFs.CreateFile(subDstPath, entry.Size, options);
 
                     using (IFile srcFile = sourceFs.OpenFile(subSrcPath, OpenMode.Read))
                     using (IFile dstFile = destFs.OpenFile(subDstPath, OpenMode.Write))
@@ -44,12 +44,12 @@ namespace LibHac.IO
             }
         }
 
-        public static void CopyFileSystem(this IFileSystem source, IFileSystem dest, IProgressReport logger = null)
+        public static void CopyFileSystem(this IFileSystem source, IFileSystem dest, IProgressReport logger = null, CreateFileOptions options = CreateFileOptions.None)
         {
             IDirectory sourceRoot = source.OpenDirectory("/", OpenDirectoryMode.All);
             IDirectory destRoot = dest.OpenDirectory("/", OpenDirectoryMode.All);
 
-            sourceRoot.CopyDirectory(destRoot, logger);
+            sourceRoot.CopyDirectory(destRoot, logger, options);
         }
 
         public static void Extract(this IFileSystem source, string destinationPath, IProgressReport logger = null)

src/LibHac/IO/IAttributeFileSystem.cs

@@ -5,6 +5,7 @@ namespace LibHac.IO
     public interface IAttributeFileSystem : IFileSystem
     {
         FileAttributes GetFileAttributes(string path);
+        void SetFileAttributes(string path, FileAttributes attributes);
         long GetFileSize(string path);
     }
 }

src/LibHac/IO/IFileSystem.cs

@@ -5,7 +5,7 @@ namespace LibHac.IO
     public interface IFileSystem
     {
         void CreateDirectory(string path);
-        void CreateFile(string path, long size);
+        void CreateFile(string path, long size, CreateFileOptions options);
         void DeleteDirectory(string path);
         void DeleteFile(string path);
         IDirectory OpenDirectory(string path, OpenDirectoryMode mode);
@@ -25,4 +25,11 @@ namespace LibHac.IO
         Files = 2,
         All = Directories | Files
     }
+
+    [Flags]
+    public enum CreateFileOptions
+    { 
+        None = 0,
+        CreateConcatenationFile = 1 << 0
+    }
 }

src/LibHac/IO/LayeredFileSystem.cs

@@ -100,7 +100,7 @@ namespace LibHac.IO
         public void Commit() { }
 
         public void CreateDirectory(string path) => throw new NotSupportedException();
-        public void CreateFile(string path, long size) => throw new NotSupportedException();
+        public void CreateFile(string path, long size, CreateFileOptions options) => throw new NotSupportedException();
         public void DeleteDirectory(string path) => throw new NotSupportedException();
         public void DeleteFile(string path) => throw new NotSupportedException();
         public void RenameDirectory(string srcPath, string dstPath) => throw new NotSupportedException();

src/LibHac/IO/LocalFileSystem.cs

@@ -23,6 +23,12 @@ namespace LibHac.IO
             return File.GetAttributes(ResolveLocalPath(path));
         }
 
+        public void SetFileAttributes(string path, FileAttributes attributes)
+        {
+            path = PathTools.Normalize(path);
+            File.SetAttributes(ResolveLocalPath(path), attributes);
+        }
+
         public long GetFileSize(string path)
         {
             path = PathTools.Normalize(path);
@@ -36,7 +42,7 @@ namespace LibHac.IO
             Directory.CreateDirectory(ResolveLocalPath(path));
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             path = PathTools.Normalize(path);
             string localPath = ResolveLocalPath(path);

src/LibHac/IO/PartitionFileSystem.cs

@@ -33,7 +33,7 @@ namespace LibHac.IO
             throw new NotSupportedException();
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             throw new NotSupportedException();
         }

src/LibHac/IO/PathTools.cs

@@ -76,6 +76,21 @@ namespace LibHac.IO
             return sb.ToString();
         }
 
+        public static string GetParentDirectory(string path)
+        {
+            if (path.Length == 0) return "/";
+
+            int i = path.Length - 1;
+
+            // A trailing separator should be ignored
+            if (path[i] == '/') i--;
+
+            while (i >= 0 && path[i] != '/') i--;
+
+            if (i < 1) return "/";
+            return path.Substring(0, i);
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal static bool IsDirectorySeparator(char c)
         {

src/LibHac/IO/RomFsFileSystem.cs

@@ -148,7 +148,7 @@ namespace LibHac.IO
         }
 
         public void CreateDirectory(string path) => throw new NotSupportedException();
-        public void CreateFile(string path, long size) => throw new NotSupportedException();
+        public void CreateFile(string path, long size, CreateFileOptions options) => throw new NotSupportedException();
         public void DeleteDirectory(string path) => throw new NotSupportedException();
         public void DeleteFile(string path) => throw new NotSupportedException();
         public void RenameDirectory(string srcPath, string dstPath) => throw new NotSupportedException();

src/LibHac/IO/Save/SaveDataFileSystem.cs

@@ -122,7 +122,7 @@ namespace LibHac.IO.Save
             throw new System.NotImplementedException();
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             throw new System.NotImplementedException();
         }

src/LibHac/IO/Save/SaveDataFileSystemCore.cs

@@ -66,7 +66,7 @@ namespace LibHac.IO.Save
             throw new System.NotImplementedException();
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             throw new System.NotImplementedException();
         }

src/LibHac/IO/SubdirectoryFileSystem.cs

@@ -24,11 +24,11 @@
             ParentFileSystem.CreateDirectory(ResolveFullPath(path));
         }
 
-        public void CreateFile(string path, long size)
+        public void CreateFile(string path, long size, CreateFileOptions options)
         {
             path = PathTools.Normalize(path);
 
-            ParentFileSystem.CreateFile(ResolveFullPath(path), size);
+            ParentFileSystem.CreateFile(ResolveFullPath(path), size, options);
         }
 
         public void DeleteDirectory(string path)