c++ - Convert byte array from utf-16 to utf-8 -

i have byte array

uint8_t array[] = {0x00, 0x72, 0x00, 0x6f,  0x00, 0x6f, 0x00, 0x74}; 

i know, in text "root"; have function should convert utf-16 utf-8. here code:

inline bool convertucs2toutf8(const std::vector<char> &from, std::string* const to) {     return ucnvconvert("utf-16", "utf-8", from, to); }  static inline bool ucnvconvert(const char *enc_from,                                const char *enc_to,                                const std::vector<char> &from,                                std::string* const to) {     if (from.empty()) {         to->clear();         return true;     }      unsigned int maxoutsize = from.size() * 3 + 1;     std::vector<char> outbuf(maxoutsize);      iconv_t c = iconv_open(enc_to, enc_from);     assert_msg(c != null, "convert: illegal encodings");     char *from_ptr = const_cast<char*>(from.data());     char *to_ptr = &outbuf[0];      size_t inleft = from.size(), outleft = maxoutsize;     size_t n = iconv(c, &from_ptr, &inleft, &to_ptr, &outleft);     bool success = true;     if (n == (size_t)-1) {         success = false;         if (errno == e2big) {             elog("convert: insufficient space from");         } else if (errno == eilseq) {             elog("convert: invalid input sequence");         } else if (errno == einval) {             elog("convert: incomplete input sequence");         }     }     if (success) {         to->assign(&outbuf[0], maxoutsize - outleft);     }     iconv_close(c);     return success; } 

it works great cyrillic (it begins 0x04), when try put array in it, :

爀漀漀琀开㌀㜀 

and on... what's wrong here ?

byte order must specified utf-16 input. since passing utf16-be (big-endian) encoded buffer, should prefix appropriate byte-order-mark:

uint8_t array[] = { 0xfe, 0xff, 0x00, 0x72, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x74 }; 

but produce utf-8 output byte order mark might not want. effective way specify endianness way:

ucnvconvert("utf-16be", "utf-8", from, to);