StringUtilities.h

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#pragma once

inline void UTF8_to_WChar(wchar_t* res, const char *string) {
        long b = 0,
                c = 0;
        if ((unsigned char)string[0] == 0xEF && (unsigned char)string[1] == 0xBB && (unsigned char)string[2] == 0xBF)
                string += 3;
        for (const char *a = string; *a; a++)
                if (((unsigned char)*a) < 128 || (*a & 192) == 192)
                        c++;
        res[c] = 0;
        for (unsigned char *a = (unsigned char*)string; *a; a++) {
                if (!(*a & 128))
                        //Byte represents an ASCII character. Direct copy will do.
                        res[b] = *a;
                else if ((*a & 192) == 128)
                        //Byte is the middle of an encoded character. Ignore.
                        continue;
                else if ((*a & 224) == 192)
                        //Byte represents the start of an encoded character in the range
                        //U+0080 to U+07FF
                        res[b] = ((*a & 31) << 6) | a[1] & 63;
                else if ((*a & 240) == 224)
                        //Byte represents the start of an encoded character in the range
                        //U+07FF to U+FFFF
                        res[b] = ((*a & 15) << 12) | ((a[1] & 63) << 6) | a[2] & 63;
                else if ((*a & 248) == 240) {
                        //Byte represents the start of an encoded character beyond the
                        //U+FFFF limit of 16-bit integers
                        res[b] = '?';
                }
                b++;
        }
}

inline bool IsNullOrWhitespace(const WCHAR* string)
{
        for (size_t index = 0; index < wcslen(string); index++)
        {
                if (string[index] != ' ')
                        return false;
        }
        return true;
}