Add a mini C filesystem wrapper library with mmap support

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/filesystem.h b/lib/filesystem.h
new file mode 100644
index 0000000..0c44236
--- /dev/null
+++ b/lib/filesystem.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "special_members.hpp"
+#include <cstddef>
+#include <sys/types.h>
+
+namespace filesystem {
+	class [[nodiscard]] memmap final {
+	public:
+		memmap(size_t length, int prot, int flags, int fd, off_t offset);
+		~memmap();
+		NO_MOVE(memmap);
+		NO_COPY(memmap);
+
+		template<typename T>
+		T *
+		get()
+		{
+			return static_cast<T *>(addr);
+		}
+
+		void msync(int flags) const;
+
+	private:
+		void * addr;
+		size_t length;
+	};
+
+	class [[nodiscard]] fh final {
+	public:
+		fh(const char * path, int flags, int mode);
+		~fh();
+		NO_MOVE(fh);
+		NO_COPY(fh);
+
+		void truncate(size_t size);
+		memmap mmap(size_t length, size_t offset, int prot, int flags);
+
+	private:
+		int h;
+	};
+}