64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// original code is from here: http://www.codeproject.com/Tips/197097/Converting-ANSI-to-Unicode-and-back
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// License: The Code Project Open License (CPOL) http://www.codeproject.com/info/cpol10.aspx
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#ifndef UTFENCODEDECODE_H
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#define UTFENCODEDECODE_H
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#include <string>
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#include <locale>
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#include <sstream>
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#include <stdexcept>
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std::string EncodeToUTF8(const std::string &, const std::locale & = std::locale::classic());
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std::string DecodeFromUTF8(const std::string &, const std::locale & = std::locale::classic());
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template<size_t buf_size = 100> class cp_converter
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{
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const std::locale loc;
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public:
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cp_converter(const std::locale &L = std::locale::classic()) : loc(L) { }
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inline std::wstring widen(const std::string &in)
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{
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return this->convert<char, wchar_t>(in);
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}
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inline std::string narrow(const std::wstring &in)
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{
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return this->convert<wchar_t, char>(in);
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}
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private:
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typedef std::codecvt<wchar_t, char, mbstate_t> codecvt_facet;
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// widen
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inline codecvt_facet::result cv(const codecvt_facet &facet, mbstate_t &s, const char *f1, const char *l1, const char *&n1, wchar_t *f2, wchar_t *l2, wchar_t *&n2) const
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{
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return facet.in(s, f1, l1, n1, f2, l2, n2);
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}
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// narrow
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inline codecvt_facet::result cv(const codecvt_facet &facet, mbstate_t &s, const wchar_t *f1, const wchar_t *l1, const wchar_t *&n1, char *f2, char *l2, char *&n2) const
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{
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return facet.out(s, f1, l1, n1, f2, l2, n2);
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}
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template<class ct_in, class ct_out> std::basic_string<ct_out> convert(const std::basic_string<ct_in> &in)
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{
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auto &facet = std::use_facet<codecvt_facet>(this->loc);
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std::basic_stringstream<ct_out> os;
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ct_out buf[buf_size];
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mbstate_t state = {0};
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codecvt_facet::result result;
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const ct_in *ipc = &in[0];
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do
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{
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ct_out *opc = nullptr;
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result = this->cv(facet, state, ipc, &in[0] + in.length(), ipc, buf, buf + buf_size, opc);
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os << std::basic_string<ct_out>(buf, opc - buf);
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} while (ipc < &in[0] + in.length() && result != codecvt_facet::error);
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if (result != codecvt_facet::ok)
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throw std::runtime_error("result is not ok!");
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return os.str();
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}
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};
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#endif
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