--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/animia/src/util/win32.cc	Wed Nov 15 02:34:59 2023 -0500
@@ -0,0 +1,90 @@
+#include "animia/util/win32.h"
+
+#include <windows.h>
+#include <shlobj.h> /* SHGetKnownFolderPath */
+#include <subauth.h> /* UNICODE_STRING */
+
+namespace animia::internal::win32 {
+
+std::string ToUtf8String(const std::wstring& string) {
+	const auto wctomb = [&string](LPSTR out, int size) -> int {
+		return ::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), out, size, nullptr, nullptr);
+	};
+
+	if (string.empty())
+		return std::string();
+
+
+	long size = ::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), nullptr, 0, nullptr, nullptr);
+	std::string ret = std::string(size, '\0');
+	::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), &ret.front(), ret.length(), nullptr, nullptr);
+	return ret;
+}
+
+std::string ToUtf8String(const UNICODE_STRING& string) {
+	const auto wctomb = [&string](LPSTR out, int size) -> int {
+		return ::WideCharToMultiByte(CP_UTF8, 0, string.Buffer, string.Length, out, size, nullptr, nullptr);
+	};
+
+	if (string.Length <= 0)
+		return std::string();
+
+	long size = wctomb(nullptr, 0);
+	std::string ret = std::string(size, '\0');
+	wctomb(&ret.front(), ret.length());
+	return ret;
+}
+
+std::wstring ToWstring(const std::string& string) {
+	const auto mbtowc = [&string](LPWSTR out, int size) -> int {
+		return ::MultiByteToWideChar(CP_UTF8, 0, string.c_str(), string.length(), out, size);
+	};
+
+	if (string.empty())
+		return std::wstring();
+
+	long size = mbtowc(nullptr, 0);
+	std::wstring ret = std::wstring(size, L'\0');
+	mbtowc(&ret.front(), ret.length());
+	return ret;
+}
+
+std::wstring GetFileNameFromPath(const std::wstring& path) {
+	const auto pos = path.find_last_of(L"/\\");
+	return pos != std::wstring::npos ? path.substr(pos + 1) : path;
+}
+
+std::wstring GetFileNameWithoutExtension(const std::wstring& filename) {
+	const auto pos = filename.find_last_of(L".");
+	return pos != std::wstring::npos ? filename.substr(0, pos) : filename;
+}
+
+static std::wstring GetSystemDirectory() {
+	PWSTR path_wch;
+	SHGetKnownFolderPath(FOLDERID_Windows, 0, NULL, &path_wch);
+	std::wstring path_wstr(path_wch);
+	CoTaskMemFree(path_wch);
+	return path_wstr;
+}
+
+bool IsSystemDirectory(const std::string& path) {
+	std::wstring path_w = ToWstring(path);
+	::CharUpperBuffW(&path_w.front(), path_w.length());
+
+	std::wstring windir = GetSystemDirectory();
+	::CharUpperBuffW(&windir.front(), windir.length());
+
+	/* wtf is 4? */
+	return path_w.find(windir) == 4;
+}
+
+bool IsSystemDirectory(std::wstring path) {
+	::CharUpperBuffW(&path.front(), path.length());
+
+	std::wstring windir = GetSystemDirectory();
+	::CharUpperBuffW(&windir.front(), windir.length());
+
+	return path.find(windir) == 4;
+}
+
+}