Added thirdparty: boost library

thirdparty/include/boost/locale/utf8_codecvt.hpp

@@ -0,0 +1,56 @@
+//
+// Copyright (c) 2015 Artyom Beilis (Tonkikh)
+//
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_LOCALE_UTF8_CODECVT_HPP
+#define BOOST_LOCALE_UTF8_CODECVT_HPP
+
+#include <boost/locale/generic_codecvt.hpp>
+#include <boost/locale/utf.hpp>
+#include <boost/assert.hpp>
+#include <cstdint>
+#include <locale>
+
+namespace boost { namespace locale {
+
+    /// \brief Generic utf8 codecvt facet, it allows to convert UTF-8 strings to UTF-16 and UTF-32 using wchar_t,
+    /// char32_t and char16_t
+    template<typename CharType>
+    class utf8_codecvt : public generic_codecvt<CharType, utf8_codecvt<CharType>> {
+    public:
+        struct state_type {};
+
+        utf8_codecvt(size_t refs = 0) : generic_codecvt<CharType, utf8_codecvt<CharType>>(refs) {}
+
+        static int max_encoding_length() { return 4; }
+
+        static state_type initial_state(generic_codecvt_base::initial_convertion_state /* unused */)
+        {
+            return state_type();
+        }
+        static utf::code_point to_unicode(state_type&, const char*& begin, const char* end)
+        {
+            const char* p = begin;
+
+            utf::code_point c = utf::utf_traits<char>::decode(p, end);
+            if(c != utf::illegal && c != utf::incomplete)
+                begin = p;
+            return c;
+        }
+
+        static utf::len_or_error from_unicode(state_type&, utf::code_point u, char* begin, const char* end)
+        {
+            BOOST_ASSERT(utf::is_valid_codepoint(u));
+            const auto width = utf::utf_traits<char>::width(u);
+            if(width > end - begin)
+                return utf::incomplete;
+            utf::utf_traits<char>::encode(u, begin);
+            return width;
+        }
+    };
+
+}} // namespace boost::locale
+
+#endif