local_ref make_jstring()

in cxx/fbjni/fbjni.cpp [107:132]

• 20 lines of code
• 3 McCabe index (conditional complexity)

local_ref<JString> make_jstring(const char* utf8) {
  if (!utf8) {
    return {};
  }
  const auto env = Environment::current();
  size_t len;
  size_t modlen = detail::modifiedLength(reinterpret_cast<const uint8_t*>(utf8), &len);
  jstring result;
  if (modlen == len) {
    // The only difference between utf8 and modifiedUTF8 is in encoding 4-byte UTF8 chars
    // and '\0' that is encoded on 2 bytes.
    //
    // Since modifiedUTF8-encoded string can be no shorter than it's UTF8 conterpart we
    // know that if those two strings are of the same length we don't need to do any
    // conversion -> no 4-byte chars nor '\0'.
    result = env->NewStringUTF(utf8);
  } else {
    auto modified = std::vector<char>(modlen + 1); // allocate extra byte for \0
    detail::utf8ToModifiedUTF8(
      reinterpret_cast<const uint8_t*>(utf8), len,
      reinterpret_cast<uint8_t*>(modified.data()), modified.size());
    result = env->NewStringUTF(modified.data());
  }
  FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
  return adopt_local(result);
}