fs.mitm: start implementation of IFileSystem api.

stratosphere/ams_mitm/source/fs_mitm/fs_idirectory.hpp

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <switch.h>
+#include <stratosphere.hpp>
+
+#include "fs_results.hpp"
+
+enum FsIDirectoryCmd : u32 {
+    FsIDirectoryCmd_Read = 0,
+    FsIDirectoryCmd_GetEntryCount = 1,
+};
+
+class IDirectory {
+    public:
+        virtual ~IDirectory() {}
+        
+        Result Read(uint64_t *out_count, FsDirectoryEntry *out_entries, uint64_t max_entries) {
+            if (out_count == nullptr) {
+                return ResultFsNullptrArgument;
+            }
+            if (max_entries == 0) {
+                *out_count = 0;
+                return 0;
+            }
+            if (out_entries == nullptr) {
+                return ResultFsNullptrArgument;
+            }
+            return ReadImpl(out_count, out_entries, max_entries);
+        }
+        
+        Result GetEntryCount(uint64_t *count) {
+            if (count == nullptr) {
+                return ResultFsNullptrArgument;
+            }
+            return GetEntryCountImpl(count);
+        }
+        
+    protected:
+        /* ...? */
+    private:
+        virtual Result ReadImpl(uint64_t *out_count, FsDirectoryEntry *out_entries, uint64_t max_entries) = 0;
+        virtual Result GetEntryCountImpl(uint64_t *count) = 0;
+};
+
+class IDirectoryInterface : public IServiceObject {
+    private:
+        std::unique_ptr<IDirectory> base_dir;
+    public:
+        IDirectoryInterface(IDirectory *d) : base_dir(d) {
+            /* ... */
+        };
+        IDirectoryInterface(std::unique_ptr<IDirectory> d) : base_dir(std::move(d)) {
+            /* ... */
+        };
+
+    private:
+        /* Actual command API. */
+        virtual Result Read(OutBuffer<FsDirectoryEntry> buffer, Out<u64> out_count) final {
+            return this->base_dir->Read(out_count.GetPointer(), buffer.buffer, buffer.num_elements);
+        };
+        virtual Result GetEntryCount(Out<u64> out_count) final {
+           return this->base_dir->GetEntryCount(out_count.GetPointer());
+        };
+    public:
+        DEFINE_SERVICE_DISPATCH_TABLE {
+            /* 1.0.0- */
+            MakeServiceCommandMeta<FsIDirectoryCmd_Read, &IDirectoryInterface::Read>(),
+            MakeServiceCommandMeta<FsIDirectoryCmd_GetEntryCount, &IDirectoryInterface::GetEntryCount>(),
+        };
+};