some fs work for openorbis (WIP)

src/common/io_file.h

@@ -0,0 +1,41 @@
+#pragma once
+#include <cstdint>
+#include <filesystem>
+#include <optional>
+
+class IOFile {
+    FILE* handle = nullptr;
+    static inline std::filesystem::path appData =""; // Directory for holding app data. AppData on Windows
+
+public:
+    IOFile() : handle(nullptr) {}
+    IOFile(FILE* handle) : handle(handle) {}
+    IOFile(const std::filesystem::path& path, const char* permissions = "rb");
+
+    bool isOpen() {
+        return handle != nullptr;
+    }
+    bool open(const std::filesystem::path& path, const char* permissions = "rb");
+    bool open(const char* filename, const char* permissions = "rb");
+    void close();
+
+    std::pair<bool, std::size_t> read(void* data, std::size_t length, std::size_t dataSize);
+    std::pair<bool, std::size_t> readBytes(void* data, std::size_t count);
+
+    std::pair<bool, std::size_t> write(const void* data, std::size_t length, std::size_t dataSize);
+    std::pair<bool, std::size_t> writeBytes(const void* data, std::size_t count);
+
+    std::optional<std::uint64_t> size();
+
+    bool seek(std::int64_t offset, int origin = SEEK_SET);
+    bool rewind();
+    bool flush();
+    FILE* getHandle();
+    static void setAppDataDir(const std::filesystem::path& dir);
+    static std::filesystem::path getAppData() {
+        return appData;
+    }
+
+    // Sets the size of the file to "size" and returns whether it succeeded or not
+    bool setSize(std::uint64_t size);
+};