Method PutNextTrailingByte

cpp/src/arrow/util/bitmap_writer.h:229–255

  }

  void PutNextTrailingByte(uint8_t byte, int valid_bits) {
    if (valid_bits == 8) {
      if (may_have_byte_offset && offset_) {
        byte = (byte << offset_) | (byte >> (8 - offset_));
        uint8_t next_byte = load<uint8_t>(bitmap_ + 1);
        current_data.epi.byte_ = (current_data.epi.byte_ & mask_) | (byte & ~mask_);
        next_byte = (next_byte & ~mask_) | (byte & mask_);
        store<uint8_t>(bitmap_, current_data.epi.byte_);
        store<uint8_t>(bitmap_ + 1, next_byte);
        current_data.epi.byte_ = next_byte;
      } else {
        store<uint8_t>(bitmap_, byte);
      }
      ++bitmap_;
    } else {
      assert(valid_bits > 0);
      assert(valid_bits < 8);
      assert(bitmap_ + bit_util::BytesForBits(offset_ + valid_bits) <= bitmap_end_);
      internal::BitmapWriter writer(bitmap_, offset_, valid_bits);
      for (int i = 0; i < valid_bits; ++i) {
        (byte & 0x01) ? writer.Set() : writer.Clear();
        writer.Next();
        byte >>= 1;
      }
      writer.Finish();
    }
  }

 private:
  int64_t offset_;