Method NextWord

cpp/src/arrow/util/bitmap_reader.h:176–197

  }

  Word NextWord() {
    bitmap_ += sizeof(Word);
    const Word next_word = load<Word>(bitmap_);
    Word word = current_data.word_;
    if (may_have_byte_offset && offset_) {
      // combine two adjacent words into one word
      // |<------ next ----->|<---- current ---->|
      // +-------------+-----+-------------+-----+
      // |     ---     |  A  |      B      | --- |
      // +-------------+-----+-------------+-----+
      //                  |         |       offset
      //                  v         v
      //               +-----+-------------+
      //               |  A  |      B      |
      //               +-----+-------------+
      //               |<------ word ----->|
      word >>= offset_;
      word |= next_word << (sizeof(Word) * 8 - offset_);
    }
    current_data.word_ = next_word;
    return word;
  }

  uint8_t NextTrailingByte(int& valid_bits) {
    uint8_t byte;