cpplibs/libstrconvert.hpp at main · Demowinter/cpplibs · GitHub

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#pragma once
#include <string>
#include <codecvt>
#include <locale>
#include <cuchar>


#ifndef _WIN32
std::wstring str2wstr(const std::string& utf8Str) {
    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> conv;
    return conv.from_bytes(utf8Str);
}

std::string wstr2str(const std::wstring& utf16Str) {
    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> conv;
    return conv.to_bytes(utf16Str);
}
#else
std::wstring str2wstr(const std::string& string)
{
    if (string.empty())
    {
        return L"";
    }

    const auto size_needed = MultiByteToWideChar(CP_UTF8, 0, &string.at(0), (int)string.size(), nullptr, 0);
    if (size_needed <= 0)
    {
        throw std::runtime_error("MultiByteToWideChar() failed: " + std::to_string(size_needed));
    }

    std::wstring result(size_needed, 0);
    MultiByteToWideChar(CP_UTF8, 0, &string.at(0), (int)string.size(), &result.at(0), size_needed);
    return result;
}

std::string wstr2str(const std::wstring& wide_string)
{
    if (wide_string.empty()) return "";

    const auto size_needed = WideCharToMultiByte(CP_UTF8, 0, &wide_string.at(0), (int)wide_string.size(), nullptr, 0, nullptr, nullptr);
    if (size_needed <= 0)
    {
        throw std::runtime_error("WideCharToMultiByte() failed: " + std::to_string(size_needed));
    }

    std::string result(size_needed, 0);
    WideCharToMultiByte(CP_UTF8, 0, &wide_string.at(0), (int)wide_string.size(), &result.at(0), size_needed, nullptr, nullptr);
    return result;
}
#endif

#if __cplusplus >= 202002L || defined(ENABLE_U8STRING)
std::string u8tostr(std::u8string str) {
    return (char*)str.c_str();
}

std::u8string strtou8(std::string str) {
    return (char8_t*)str.c_str();
}
#else
std::string u8tostr(std::string str) { // stub
    return str;
}

std::string strtou8(std::string str) { // stub
    return str;
}
#endif

static void cp2utf1(char* out, const char* in) {
    static const int table[128] = {
        0x82D0,0x83D0,0x9A80E2,0x93D1,0x9E80E2,0xA680E2,0xA080E2,0xA180E2,
        0xAC82E2,0xB080E2,0x89D0,0xB980E2,0x8AD0,0x8CD0,0x8BD0,0x8FD0,
        0x92D1,0x9880E2,0x9980E2,0x9C80E2,0x9D80E2,0xA280E2,0x9380E2,0x9480E2,
        0,0xA284E2,0x99D1,0xBA80E2,0x9AD1,0x9CD1,0x9BD1,0x9FD1,
        0xA0C2,0x8ED0,0x9ED1,0x88D0,0xA4C2,0x90D2,0xA6C2,0xA7C2,
        0x81D0,0xA9C2,0x84D0,0xABC2,0xACC2,0xADC2,0xAEC2,0x87D0,
        0xB0C2,0xB1C2,0x86D0,0x96D1,0x91D2,0xB5C2,0xB6C2,0xB7C2,
        0x91D1,0x9684E2,0x94D1,0xBBC2,0x98D1,0x85D0,0x95D1,0x97D1,
        0x90D0,0x91D0,0x92D0,0x93D0,0x94D0,0x95D0,0x96D0,0x97D0,
        0x98D0,0x99D0,0x9AD0,0x9BD0,0x9CD0,0x9DD0,0x9ED0,0x9FD0,
        0xA0D0,0xA1D0,0xA2D0,0xA3D0,0xA4D0,0xA5D0,0xA6D0,0xA7D0,
        0xA8D0,0xA9D0,0xAAD0,0xABD0,0xACD0,0xADD0,0xAED0,0xAFD0,
        0xB0D0,0xB1D0,0xB2D0,0xB3D0,0xB4D0,0xB5D0,0xB6D0,0xB7D0,
        0xB8D0,0xB9D0,0xBAD0,0xBBD0,0xBCD0,0xBDD0,0xBED0,0xBFD0,
        0x80D1,0x81D1,0x82D1,0x83D1,0x84D1,0x85D1,0x86D1,0x87D1,
        0x88D1,0x89D1,0x8AD1,0x8BD1,0x8CD1,0x8DD1,0x8ED1,0x8FD1
    };

    while (*in)
        if (*in & 0x80) {
            int v = table[(int)(0x7f & *in++)];
            if (!v)
                continue;
            *out++ = (char)v;
            *out++ = (char)(v >> 8);
            if (v >>= 16)
                *out++ = (char)v;
        }
        else
            *out++ = *in++;
    *out = 0;
}
std::string cp1251toutf8(std::string s) {
    int c, i;
    int len = s.size();
    std::string ns;

    for (i = 0; i < len; i++) {
        c = s[i];
        char buf[4], in[2] = { 0, 0 };
        *in = c;
        cp2utf1(buf, in);
        ns += std::string(buf);
    }

    return ns;
}