Function add_graph_to_chain

commit-graph.c:570–614

}

static int add_graph_to_chain(struct commit_graph *g,
			      struct commit_graph *chain,
			      struct object_id *oids,
			      int n)
{
	struct commit_graph *cur_g = chain;

	if (n && !g->chunk_base_graphs) {
		warning(_("commit-graph has no base graphs chunk"));
		return 0;
	}

	if (g->chunk_base_graphs_size / g->hash_algo->rawsz < n) {
		warning(_("commit-graph base graphs chunk is too small"));
		return 0;
	}

	while (n) {
		n--;

		if (!cur_g ||
		    !oideq(&oids[n], &cur_g->oid) ||
		    !hasheq(oids[n].hash, g->chunk_base_graphs + st_mult(g->hash_algo->rawsz, n),
			    g->hash_algo)) {
			warning(_("commit-graph chain does not match"));
			return 0;
		}

		cur_g = cur_g->base_graph;
	}

	if (chain) {
		if (unsigned_add_overflows(chain->num_commits,
					   chain->num_commits_in_base)) {
			warning(_("commit count in base graph too high: %"PRIuMAX),
				(uintmax_t)chain->num_commits_in_base);
			return 0;
		}
		g->num_commits_in_base = chain->num_commits + chain->num_commits_in_base;
	}

	g->base_graph = chain;

	return 1;
}

int open_commit_graph_chain(const char *chain_file,
			    int *fd, struct stat *st,