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diff --git a/src/third-party/scnlib/include/scn/unicode/common.h b/src/third-party/scnlib/include/scn/unicode/common.h
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+++ b/src/third-party/scnlib/include/scn/unicode/common.h
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+// Copyright 2017 Elias Kosunen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a part of scnlib:
+//     https://github.com/eliaskosunen/scnlib
+//
+// The contents of this file are based on utfcpp:
+//     https://github.com/nemtrif/utfcpp
+//     Copyright (c) 2006 Nemanja Trifunovic
+//     Distributed under the Boost Software License, version 1.0
+
+#ifndef SCN_UNICODE_COMMON_H
+#define SCN_UNICODE_COMMON_H
+
+#include "../detail/fwd.h"
+
+#include <cstdint>
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    /**
+     * A Unicode code point
+     */
+    enum class code_point : uint32_t {};
+
+    template <typename T>
+    constexpr bool operator==(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) == static_cast<uint32_t>(b);
+    }
+    template <typename T>
+    constexpr bool operator!=(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) != static_cast<uint32_t>(b);
+    }
+    template <typename T>
+    constexpr bool operator<(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) < static_cast<uint32_t>(b);
+    }
+    template <typename T>
+    constexpr bool operator>(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) > static_cast<uint32_t>(b);
+    }
+    template <typename T>
+    constexpr bool operator<=(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) <= static_cast<uint32_t>(b);
+    }
+    template <typename T>
+    constexpr bool operator>=(code_point a, T b)
+    {
+        return static_cast<uint32_t>(a) >= static_cast<uint32_t>(b);
+    }
+
+    namespace detail {
+        static constexpr const uint16_t lead_surrogate_min = 0xd800;
+        static constexpr const uint16_t lead_surrogate_max = 0xdbff;
+        static constexpr const uint16_t trail_surrogate_min = 0xdc00;
+        static constexpr const uint16_t trail_surrogate_max = 0xdfff;
+        static constexpr const uint16_t lead_offset =
+            lead_surrogate_min - (0x10000u >> 10);
+        static constexpr const uint32_t surrogate_offset =
+            0x10000u - (lead_surrogate_min << 10) - trail_surrogate_min;
+        static constexpr const uint32_t code_point_max = 0x10ffff;
+
+        template <typename Octet>
+        constexpr uint8_t mask8(Octet o)
+        {
+            return static_cast<uint8_t>(0xff & o);
+        }
+        template <typename U16>
+        constexpr uint16_t mask16(U16 v)
+        {
+            return static_cast<uint16_t>(0xffff & v);
+        }
+        template <typename U16>
+        constexpr bool is_lead_surrogate(U16 cp)
+        {
+            return cp >= lead_surrogate_min && cp <= lead_surrogate_max;
+        }
+        template <typename U16>
+        constexpr bool is_trail_surrogate(U16 cp)
+        {
+            return cp >= trail_surrogate_min && cp <= trail_surrogate_max;
+        }
+        template <typename U16>
+        constexpr bool is_surrogate(U16 cp)
+        {
+            return cp >= lead_surrogate_min && cp <= trail_surrogate_max;
+        }
+
+        constexpr inline bool is_code_point_valid(code_point cp)
+        {
+            return cp <= code_point_max && !is_surrogate(cp);
+        }
+    }  // namespace detail
+
+    template <typename T>
+    constexpr code_point make_code_point(T ch)
+    {
+        return static_cast<code_point>(ch);
+    }
+
+    /**
+     * Returns `true`, if `cp` is valid, e.g. is less than or equal to the
+     * maximum value for a code point (U+10FFFF), and is not a surrogate (U+D800
+     * to U+DFFF).
+     */
+    constexpr inline bool is_valid_code_point(code_point cp)
+    {
+        return detail::is_code_point_valid(cp);
+    }
+    /**
+     * Returns `true` if `cp` can be encoded in ASCII as-is (is between U+0 and
+     * U+7F)
+     */
+    constexpr inline bool is_ascii_code_point(code_point cp)
+    {
+        return cp <= 0x7f;
+    }
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif