@param idx The index
@param l_meta Length of data
@param meta Pointer to the extra data
@param is_copy If not zero, a copy of the data is taken
@return 0 on success; -1 on failure (out of memory).
Sets the data that is returned by hts_idx_get_meta().
If is_copy != 0, a copy of the input data is taken. If not, ownership of
the data pointed to by *meta passes to the index.
@param idx The index @param l_meta Length of data @param meta Pointer to the extra data @param is_copy If not zero, a copy of the data is taken @return 0 on success; -1 on failure (out of memory).
Sets the data that is returned by hts_idx_get_meta().
If is_copy != 0, a copy of the input data is taken. If not, ownership of the data pointed to by *meta passes to the index.