Function main

devtools/gossmap-compress.c:526–829

}

int main(int argc, char *argv[])
{
	int outfd;
	const struct pubkey **node_ids;
	bool print_nodes = false;

	common_setup(argv[0]);
	setup_locale();

	node_ids = tal_arr(tmpctx, const struct pubkey *, 0);
	opt_register_noarg("--verbose|-v", opt_add_one, &verbose,
			   "Print details (each additional gives more!).");
	opt_register_arg("--node-map=num=<nodeid>", opt_node, NULL, &node_ids,
			   "Map node num to <nodeid> (decompress only)");
	opt_register_noarg("--output-node-map", opt_set_bool, &print_nodes,
			   "Output nodenumber:nodeid:alias for each node (compress only)");
	opt_register_noarg("--help|-h", opt_usage_and_exit,
			   "[decompress|compress] infile outfile\n"
			   "Compress or decompress a gossmap file",
			   "Print this message.");

	opt_parse(&argc, argv, opt_log_stderr_exit);
	if (argc != 4)
		opt_usage_exit_fail("Needs 4 arguments");

	outfd = open(argv[3], O_WRONLY|O_CREAT|O_TRUNC, 0666);
	if (outfd < 0)
		opt_usage_exit_fail(tal_fmt(tmpctx, "Cannot open %s for writing: %s",
					    argv[3], strerror(errno)));

	if (streq(argv[1], "compress")) {
		struct gossmap_node **nodes, *n;
		size_t *node_to_compr_idx;
		size_t node_count, channel_count;
		struct gossmap_chan **chans, *c;
		bool *dirs;
		gzFile outf = gzdopen(outfd, "wb9");

		struct gossmap *gossmap = gossmap_load(tmpctx, argv[2], NULL, NULL);
		if (!gossmap)
			opt_usage_exit_fail(tal_fmt(tmpctx, "Cannot open %s for reading: %s",
						    argv[2], strerror(errno)));

		nodes = tal_arr(gossmap, struct gossmap_node *, gossmap_max_node_idx(gossmap));
		for (node_count = 0, n = gossmap_first_node(gossmap);
		     n;
		     n = gossmap_next_node(gossmap, n), node_count++) {
			nodes[node_count] = n;
		}
		tal_resize(&nodes, node_count);
		if (verbose)
			printf("%zu nodes\n", node_count);

		/* nodes with most channels go first */
		asort(nodes, tal_count(nodes), cmp_node_num_chans, NULL);

		/* Create map of gossmap index to compression index */
		node_to_compr_idx = tal_arr(nodes, size_t, gossmap_max_node_idx(gossmap));