/* Writes @num_bits bits, given by the @num_bits least significant bits of
* @bits, to the output @ostream. */
int bitstream_put_bits(struct output_bitstream *ostream, output_bitbuf_t bits,
/* Writes @num_bits bits, given by the @num_bits least significant bits of
* @bits, to the output @ostream. */
int bitstream_put_bits(struct output_bitstream *ostream, output_bitbuf_t bits,