Function utf8_length_from_utf32

test-app/runtime/src/main/cpp/ada/ada.cpp:245–256

}

size_t utf8_length_from_utf32(const char32_t* buf, size_t len) {
  // We are not BOM aware.
  const uint32_t* p = reinterpret_cast<const uint32_t*>(buf);
  size_t counter{0};
  for (size_t i = 0; i != len; ++i) {
    ++counter;                                      // ASCII
    counter += static_cast<size_t>(p[i] > 0x7F);    // two-byte
    counter += static_cast<size_t>(p[i] > 0x7FF);   // three-byte
    counter += static_cast<size_t>(p[i] > 0xFFFF);  // four-bytes
  }
  return counter;
}

size_t utf32_length_from_utf8(const char* buf, size_t len) {
  const int8_t* p = reinterpret_cast<const int8_t*>(buf);