codesnippets

std::string GetUnicodeChar(unsigned int code) {
    std::string s;
    s.resize(5);
    if (code <= 0x7F) {
        s[0] = (code & 0x7F); s[1] = '\0';
    } else if (code <= 0x7FF) {
        // one continuation byte
        s[1] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[0] = 0xC0 | (code & 0x1F); s[2] = '\0';
    } else if (code <= 0xFFFF) {
        // two continuation bytes
        s[2] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[1] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[0] = 0xE0 | (code & 0xF); s[3] = '\0';
    } else if (code <= 0x10FFFF) {
        // three continuation bytes
        s[3] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[2] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[1] = 0x80 | (code & 0x3F); code = (code >> 6);
        s[0] = 0xF0 | (code & 0x7); s[4] = '\0';
    } else {
        // unicode replacement character
        s[2] = 0xEF; s[1] = 0xBF; s[0] = 0xBD;
        s[3] = '\0';
    }
    return s;
}