Method buffer_len

cpp/src/arrow/util/bit_stream_utils_internal.h:58–58

  }
  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
  /// packed.  Returns false if there was not enough space. num_bits must be <= 64.