1 files changed, 54 insertions, 0 deletions
diff --git a/include/file/metadata.hpp b/include/file/metadata.hpp
new file mode 100644
index 0000000..8b9ec4f
--- /dev/null
+++ b/include/file/metadata.hpp
@@ -0,0 +1,54 @@
+#pragma once
+
+#include "util/bitset.hpp"
+#include "util/io.hpp"
+#include <cstdint>
+#include <cstdio>
+#include <stdexcept>
+
+namespace file {
+
+enum class filetype : uint8_t {
+	Map = 1,
+	World,
+	Player,
+	TOTAL,
+};
+
+struct metadata {
+	static constexpr auto magic = 27981915666277746uL;
+	static constexpr auto magic_mask = 0xFFFFFFFFFFFFFFuL;
+	static constexpr auto size = 20;
+
+	enum class flags {
+		Favorite,
+	};
+
+	filetype ftype;
+	uint32_t revision;
+	bitset<64> flags;
+
+	template <class T>
+	ssize_t read(io::serialized_io<T>& io)
+	{
+		uint64_t filemagic;
+		auto bytes = io.read(filemagic);
+		if ((filemagic & magic_mask) != magic) {
+			throw std::runtime_error("not a relogic file");
+		}
+
+		uint8_t type = ((filemagic >> 56) & 0xFF);
+		if (type == 0 || type >= int(filetype::TOTAL)) {
+			throw std::runtime_error("unknown file type");
+		}
+
+		ftype = filetype(type);
+
+		bytes += io.read(revision);
+		bytes += io.read(flags);
+
+		return bytes;
+	}
+};
+
+}
+\ No newline at end of file