Method buffer

cpp/src/arrow/util/bit_stream_utils_internal.h:57–57

    return byte_offset_ + static_cast<int>(bit_util::BytesForBits(bit_offset_));
  }
  uint8_t* buffer() const { return buffer_; }
  int buffer_len() const { return max_bytes_; }

  /// Writes a value to buffered_values_, flushing to buffer_ if necessary.  This is bit