encoding_utils.hpp

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#pragma once
 
#ifndef _LOGIT_ENCODING_UTILS_HPP_INCLUDED
#define _LOGIT_ENCODING_UTILS_HPP_INCLUDED

 
#include <string>
 
#if defined(_WIN32)
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <stringapiset.h>
 
namespace logit {

    inline std::string utf8_to_ansi(const std::string& utf8) {
        int n_len = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0);
        if (n_len == 0) return {};
 
        std::wstring wide_string(n_len + 1, L'\0');
        MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, &wide_string[0], n_len);
 
        n_len = WideCharToMultiByte(CP_ACP, 0, wide_string.c_str(), -1, NULL, 0, NULL, NULL);
        if (n_len == 0) return {};
 
        std::string ansi_string(n_len - 1, '\0');
        WideCharToMultiByte(CP_ACP, 0, wide_string.c_str(), -1, &ansi_string[0], n_len, NULL, NULL);
        return ansi_string;
    }

    inline std::wstring utf8_to_wstring(const std::string& utf8) {
        int n_len = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0);
        if (n_len == 0) return {};
        std::wstring wide_string(n_len - 1, L'\0');
        MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, &wide_string[0], n_len);
        return wide_string;
    }

    inline std::string wstring_to_utf8(const std::wstring& wide) {
        int n_len = WideCharToMultiByte(CP_UTF8, 0, wide.c_str(), -1, NULL, 0, NULL, NULL);
        if (n_len == 0) return {};
        std::string utf8(n_len - 1, '\0');
        WideCharToMultiByte(CP_UTF8, 0, wide.c_str(), -1, &utf8[0], n_len, NULL, NULL);
        return utf8;
    }
 
} // namespace logit
#endif // defined(_WIN32)
 
#endif // _LOGIT_ENCODING_UTILS_HPP_INCLUDED