encoding.cpp

#include "StdAfx.h"
#include "encoding.h"

int Encoding::utfOffset(const std::string utf8, int unicodeOffset)
{
    int result = 0;
    std::string::const_iterator i = utf8.begin(), end = utf8.end();
    while (unicodeOffset > 0 && i != end)
    {
        if ((*i & 0xC0) == 0xC0 && unicodeOffset == 1)
        {
            break;
        }
        if ((*i & 0x80) == 0 || (*i & 0xC0) == 0x80)
        {
            --unicodeOffset;
        }
        ++i;
        if (i != end && *i != 0x0D && *i != 0x0A)
        {
            ++result;
        }
    }

    return result;
}

std::string Encoding::toUTF(const std::wstring &data)
{
    std::string str;
    if (!data.empty())
    {
        int size = WideCharToMultiByte(CP_UTF8, 0, &data[0], (int)data.size(), NULL, 0, NULL, NULL);
        str.resize(size);
        WideCharToMultiByte(CP_UTF8, 0, &data[0], (int)data.size(), &str[0], size, NULL, NULL);
    }

    return str;
}

std::wstring Encoding::toUnicode(const std::string &string, UINT encoding)
{
    std::wstring str;
    if (!string.empty())
    {
        int i = MultiByteToWideChar(encoding, 0, string.c_str(), -1, NULL, 0);
        str.resize(i - 1);
        MultiByteToWideChar(encoding, 0, string.c_str(), -1, &str[0], i);
    }
    return str;
}