Add <lol/file> to easily read and write files.

TODO.md

@@ -34,7 +34,6 @@
     src/lol/lua.h
     src/lol/net/http.h
     src/lol/public.h
-    src/lol/sys/file.h
     src/lol/sys/init.h
 
 

include/lol/file

@@ -0,0 +1,18 @@
+//
+//  Lol Engine
+//
+//  Copyright © 2010—2020 Sam Hocevar <sam@hocevar.net>
+//
+//  Lol Engine is free software. It comes without any warranty, to
+//  the extent permitted by applicable law. You can redistribute it
+//  and/or modify it under the terms of the Do What the Fuck You Want
+//  to Public License, Version 2, as published by the WTFPL Task Force.
+//  See http://www.wtfpl.net/ for more details.
+//
+
+#pragma once
+
+#include "private/push_macros.h"
+#include "private/sys/file.h"
+#include "private/pop_macros.h"
+

include/lol/private/sys/file.h

@@ -0,0 +1,48 @@
+//
+//  Lol Engine
+//
+//  Copyright © 2010—2020 Sam Hocevar <sam@hocevar.net>
+//
+//  Lol Engine is free software. It comes without any warranty, to
+//  the extent permitted by applicable law. You can redistribute it
+//  and/or modify it under the terms of the Do What the Fuck You Want
+//  to Public License, Version 2, as published by the WTFPL Task Force.
+//  See http://www.wtfpl.net/ for more details.
+//
+
+#pragma once
+
+//
+// The file-related classes
+// ————————————————————————
+// These do not use std::filesystem yet because of the stdc++fs link requirement.
+//
+
+#include <fstream> // std::ofstream
+
+namespace lol::file
+{
+
+template<typename T, typename U = typename T::value_type>
+static inline bool read(std::string const &path, T &data)
+{
+    std::ifstream f(path, std::ios::in | std::ios::binary | std::ios::ate);
+    auto file_size = f.tellg(); // works because std::ios::ate
+    if (file_size < 0)
+        return false;
+    f.seekg(0, std::ios::beg);
+    data.resize((file_size + sizeof(U) - 1) / sizeof(U));
+    f.read((char *)data.data(), file_size);
+    return !f.fail();
+}
+
+template<typename T, typename U = typename T::value_type>
+static inline bool write(std::string const &path, T const &data)
+{
+    std::ofstream f(path, std::ios::binary);
+    f.write((char const *)data.data(), data.size() * sizeof(U));
+    f.close();
+    return !f.fail();
+}
+
+} // namespace lol::file