size_t utf16toUTF8Length()

in androidLibs/fbjni/cxx/fbjni/detail/utf8.cpp [213:239]

• 25 lines of code
• 11 McCabe index (conditional complexity)

size_t utf16toUTF8Length(const uint16_t* utf16String, size_t utf16StringLen) {
  if (!utf16String || utf16StringLen == 0) {
    return 0;
  }

  uint32_t utf8StringLen = 0;
  auto utf16StringEnd = utf16String + utf16StringLen;
  auto idx16 = utf16String;
  while (idx16 < utf16StringEnd) {
    auto ch = *idx16++;
    if (ch < kUtf8OneByteBoundary) {
      utf8StringLen++;
    } else if (ch < kUtf8TwoBytesBoundary) {
      utf8StringLen += 2;
    } else if (
        (ch >= kUtf16HighSubLowBoundary) && (ch < kUtf16HighSubHighBoundary) &&
        (idx16 < utf16StringEnd) &&
        (*idx16 >= kUtf16HighSubHighBoundary) && (*idx16 < kUtf16LowSubHighBoundary)) {
      utf8StringLen += 4;
      idx16++;
    } else {
      utf8StringLen += 3;
    }
  }

  return utf8StringLen;
}