Function Utf8IsContinuation

cpp/src/arrow/util/utf8_internal.h:295–297

}

static inline bool Utf8IsContinuation(const uint8_t codeunit) {
  return (codeunit & 0xC0) == 0x80;  // upper two bits should be 10
}

static inline bool Utf8Is2ByteStart(const uint8_t codeunit) {
  return (codeunit & 0xE0) == 0xC0;  // upper three bits should be 110