Config: Implement 128-bit setting entry type

Utilities/Config.cpp

@@ -166,6 +166,55 @@ bool try_to_uint64(u64* out, std::string_view value, u64 min, u64 max)
 	return true;
 }
 
+bool try_to_uint128(u128* out, std::string_view value)
+{
+	if (value.empty())
+	{
+		if (out) cfg_log.error("cfg::try_to_uint128(): called with an empty string");
+		return false;
+	}
+
+	u64 result_low = 0, result_high = 0;
+	const char* start_high64 = value.data();
+	const char* end = value.data() + value.size();
+
+	if (start_high64[0] == '0' && value.size() >= 2 && (start_high64[1] == 'x' || start_high64[1] == 'X'))
+	{
+		// Hex support
+		start_high64 += 2;
+	}
+
+	const char* start_low64 = end - std::min<usz>(end - start_high64, 16);
+
+	// Hexadecimal-only
+	constexpr int base = 16;
+
+	auto ret = std::from_chars(start_low64, end, result_low, base);
+
+	if (ret.ec != std::errc() || ret.ptr != end)
+	{
+		if (out) cfg_log.error("cfg::try_to_uint128('%s'): invalid integer", value);
+		return false;
+	}
+
+	if (start_high64 == start_low64)
+	{
+		if (out) *out = result_low;
+		return true;
+	}
+
+	ret = std::from_chars(start_high64, start_low64, result_high, base);
+
+	if (ret.ec != std::errc() || ret.ptr != start_low64)
+	{
+		if (out) cfg_log.error("cfg::try_to_uint128('%s'): invalid integer", value);
+		return false;
+	}
+
+	if (out) *out = result_low + (u128{result_high} << 64);
+	return true;
+}
+
 std::vector<std::string> cfg::make_float_range(f64 min, f64 max)
 {
 	return {std::to_string(min), std::to_string(max)};
@@ -278,6 +327,19 @@ bool cfg::try_to_enum_value(u64* out, decltype(&fmt_class_string<int>::format) f
 	return true;
 }
 
+std::string cfg::uint128::to_string(u128 value) noexcept
+{
+	std::string result = "0x";
+	result.resize(result.size() + 32);
+
+	for (u32 i = 0; i < 32; i++)
+	{
+		result[result.size() - 1 - i] = "0123456789ABCDEF"[static_cast<u64>(value >> (i * 4)) % 16];
+	}
+
+	return result;
+}
+
 std::vector<std::string> cfg::try_to_enum_list(decltype(&fmt_class_string<int>::format) func)
 {
 	std::vector<std::string> result;

Utilities/Config.h

@@ -38,6 +38,7 @@ namespace cfg
 		_enum, // cfg::_enum type
 		_int, // cfg::_int type
 		uint, // cfg::uint type
+		uint128, // cfg::uint128 type
 		string, // cfg::string type
 		set, // cfg::set_entry type
 		map, // cfg::map_entry type
@@ -578,6 +579,86 @@ namespace cfg
 	// Alias for 64 bit int
 	using uint64 = uint<0, u64{umax}>;
 
+	// Unsigned 128-bit integer entry.
+	class uint128 final : public _base
+	{
+		using int_type = u128;
+
+		atomic_t<int_type> m_value{};
+		int_type original_def = 0;
+
+	public:
+		int_type def;
+
+		uint128(node* owner, const std::string& name, int_type def = 0, bool dynamic = false)
+			: _base(type::uint128, owner, name, dynamic)
+			, m_value(def)
+			, original_def(def)
+			, def(def)
+		{
+		}
+
+		operator int_type() const
+		{
+			return m_value;
+		}
+
+		operator ullong() const
+		{
+			return static_cast<ullong>(m_value.load());
+		}
+
+		int_type get() const
+		{
+			return m_value;
+		}
+
+		void from_default() override
+		{
+			m_value = def;
+		}
+
+		void restore_defaults() override
+		{
+			def = original_def;
+		}
+
+		static std::string to_string(u128 value) noexcept;
+
+		std::string to_string() const override
+		{
+			return to_string(m_value.load());
+		}
+
+		std::string def_to_string() const override
+		{
+			return to_string(def);
+		}
+
+		bool from_string(std::string_view value, bool /*dynamic*/ = false) override
+		{
+			u128 result;
+			if (try_to_uint128(&result, value))
+			{
+				m_value = result;
+				return true;
+			}
+
+			return false;
+		}
+
+		void set(u128 value)
+		{
+			m_value = value;
+		}
+
+		std::vector<std::string> to_list() const override
+		{
+			// Should not be used
+			return make_uint_range(0, 1);
+		}
+	};
+
 	// Simple string entry with mutex
 	class string : public _base
 	{

Utilities/StrUtil.h

@@ -28,6 +28,9 @@ bool try_to_int64(s64* out, std::string_view value, s64 min, s64 max);
 // Convert string to unsigned integer
 bool try_to_uint64(u64* out, std::string_view value, u64 min, u64 max);
 
+// Convert string to unsigned int128_t
+bool try_to_uint128(u128* out, std::string_view value);
+
 // Convert string to float
 bool try_to_float(f64* out, std::string_view value, f64 min, f64 max);