Added MemoryFileSystemAdapter.

source/mijin/virtual_filesystem/memory.hpp

@@ -0,0 +1,55 @@
+
+#pragma once
+
+#if !defined(MIJIN_SOURCE_MIJIN_VIRTUAL_FILESYSTEM_MEMORY_HPP_INCLUDED)
+#define MIJIN_SOURCE_MIJIN_VIRTUAL_FILESYSTEM_MEMORY_HPP_INCLUDED 1
+
+#include <variant>
+#include <vector>
+
+#include "../container/vector_map.hpp"
+#include "../util/flag.hpp"
+#include "../virtual_filesystem/filesystem.hpp"
+
+namespace mijin
+{
+namespace detail
+{
+struct MemoryFile
+{
+    std::span<const std::uint8_t> data;
+};
+struct MemoryFolder
+{
+    VectorMap<std::string, MemoryFile> files;
+    VectorMap<std::string, MemoryFolder> folders;
+};
+}
+
+class MemoryFileSystemAdapter : public FileSystemAdapter
+{
+public:
+    MIJIN_DEFINE_FLAG(Overwrite);
+    MIJIN_DEFINE_FLAG(CopyData);
+private:
+    detail::MemoryFolder root_;
+    std::vector<std::vector<std::uint8_t>> fileData_;
+public:
+    [[nodiscard]] std::vector<FileInfo> listFiles(const fs::path& folder) override;
+    [[nodiscard]] FileInfo getFileInfo(const fs::path& file) override;
+    [[nodiscard]] StreamError open(const fs::path& path, FileOpenMode mode, std::unique_ptr<Stream>& outStream) override;
+
+    bool addFile(const fs::path& path, std::span<const std::uint8_t> data, Overwrite overwrite = Overwrite::NO, CopyData copyData = CopyData::NO);
+    bool addFile(const fs::path& path, std::span<const std::uint8_t> data, CopyData copyData)
+    {
+        return addFile(path, data, Overwrite::NO, copyData);
+    }
+    void addFolder(const fs::path& path);
+private:
+    detail::MemoryFolder* findFolder(const fs::path& path, bool create = false) MIJIN_NOEXCEPT;
+    FileInfo folderInfo(const fs::path& path, const detail::MemoryFolder& folder) const MIJIN_NOEXCEPT;
+    FileInfo fileInfo(const fs::path& path, const detail::MemoryFile& file) const MIJIN_NOEXCEPT;
+};
+} // namespace mijin
+
+#endif // !defined(MIJIN_SOURCE_MIJIN_VIRTUAL_FILESYSTEM_MEMORY_HPP_INCLUDED)