static int find_common(struct fetch_pack_args *args,
		       int fd[2], unsigned char *result_sha1,
		       struct ref *refs)
{
	int fetching;
	int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
	const unsigned char *sha1;
	unsigned in_vain = 0;
	int got_continue = 0;
	int got_ready = 0;
	struct strbuf req_buf = STRBUF_INIT;
	size_t state_len = 0;

	if (args->stateless_rpc && multi_ack == 1)
		die("--stateless-rpc requires multi_ack_detailed");
	if (marked)
		for_each_ref(clear_marks, NULL);
	marked = 1;

	for_each_ref(rev_list_insert_ref_oid, NULL);
	for_each_alternate_ref(insert_one_alternate_ref, NULL);

	fetching = 0;
	for ( ; refs ; refs = refs->next) {
		unsigned char *remote = refs->old_oid.hash;
		const char *remote_hex;
		struct object *o;

		/*
		 * If that object is complete (i.e. it is an ancestor of a
		 * local ref), we tell them we have it but do not have to
		 * tell them about its ancestors, which they already know
		 * about.
		 *
		 * We use lookup_object here because we are only
		 * interested in the case we *know* the object is
		 * reachable and we have already scanned it.
		 */
		if (((o = lookup_object(remote)) != NULL) &&
				(o->flags & COMPLETE)) {
			continue;
		}

		remote_hex = sha1_to_hex(remote);
		if (!fetching) {
			struct strbuf c = STRBUF_INIT;
			if (multi_ack == 2)     strbuf_addstr(&c, " multi_ack_detailed");
			if (multi_ack == 1)     strbuf_addstr(&c, " multi_ack");
			if (no_done)            strbuf_addstr(&c, " no-done");
			if (use_sideband == 2)  strbuf_addstr(&c, " side-band-64k");
			if (use_sideband == 1)  strbuf_addstr(&c, " side-band");
			if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
			if (args->no_progress)   strbuf_addstr(&c, " no-progress");
			if (args->include_tag)   strbuf_addstr(&c, " include-tag");
			if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
			if (agent_supported)    strbuf_addf(&c, " agent=%s",
							    git_user_agent_sanitized());
			packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
			strbuf_release(&c);
		} else
			packet_buf_write(&req_buf, "want %s\n", remote_hex);
		fetching++;
	}

	if (!fetching) {
		strbuf_release(&req_buf);
		packet_flush(fd[1]);
		return 1;
	}

	if (is_repository_shallow())
		write_shallow_commits(&req_buf, 1, NULL);
	if (args->depth > 0)
		packet_buf_write(&req_buf, "deepen %d", args->depth);
	packet_buf_flush(&req_buf);
	state_len = req_buf.len;

	if (args->depth > 0) {
		char *line;
		const char *arg;
		unsigned char sha1[20];

		send_request(args, fd[1], &req_buf);
		while ((line = packet_read_line(fd[0], NULL))) {
			if (skip_prefix(line, "shallow ", &arg)) {
				if (get_sha1_hex(arg, sha1))
					die("invalid shallow line: %s", line);
				register_shallow(sha1);
				continue;
			}
			if (skip_prefix(line, "unshallow ", &arg)) {
				if (get_sha1_hex(arg, sha1))
					die("invalid unshallow line: %s", line);
				if (!lookup_object(sha1))
					die("object not found: %s", line);
				/* make sure that it is parsed as shallow */
				if (!parse_object(sha1))
					die("error in object: %s", line);
				if (unregister_shallow(sha1))
					die("no shallow found: %s", line);
//.........这里部分代码省略.........

int cmd_diff(int argc, const char **argv, const char *prefix)
{
	int i;
	struct rev_info rev;
	struct object_array_entry ent[100];
	int ents = 0, blobs = 0, paths = 0;
	const char *path = NULL;
	struct blobinfo blob[2];
	int nongit;
	int result = 0;

	/*
	 * We could get N tree-ish in the rev.pending_objects list.
	 * Also there could be M blobs there, and P pathspecs.
	 *
	 * N=0, M=0:
	 *	cache vs files (diff-files)
	 * N=0, M=2:
	 *      compare two random blobs.  P must be zero.
	 * N=0, M=1, P=1:
	 *	compare a blob with a working tree file.
	 *
	 * N=1, M=0:
	 *      tree vs cache (diff-index --cached)
	 *
	 * N=2, M=0:
	 *      tree vs tree (diff-tree)
	 *
	 * N=0, M=0, P=2:
	 *      compare two filesystem entities (aka --no-index).
	 *
	 * Other cases are errors.
	 */

	prefix = setup_git_directory_gently(&nongit);
	git_config(git_diff_ui_config, NULL);

	if (diff_use_color_default == -1)
		diff_use_color_default = git_use_color_default;

	init_revisions(&rev, prefix);

	/* If this is a no-index diff, just run it and exit there. */
	diff_no_index(&rev, argc, argv, nongit, prefix);

	/* Otherwise, we are doing the usual "git" diff */
	rev.diffopt.skip_stat_unmatch = !!diff_auto_refresh_index;

	/* Default to let external and textconv be used */
	DIFF_OPT_SET(&rev.diffopt, ALLOW_EXTERNAL);
	DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV);

	if (nongit)
		die("Not a git repository");
	argc = setup_revisions(argc, argv, &rev, NULL);
	if (!rev.diffopt.output_format) {
		rev.diffopt.output_format = DIFF_FORMAT_PATCH;
		if (diff_setup_done(&rev.diffopt) < 0)
			die("diff_setup_done failed");
	}

	DIFF_OPT_SET(&rev.diffopt, RECURSIVE);

	/*
	 * If the user asked for our exit code then don't start a
	 * pager or we would end up reporting its exit code instead.
	 */
	if (!DIFF_OPT_TST(&rev.diffopt, EXIT_WITH_STATUS) &&
	    check_pager_config("diff") != 0)
		setup_pager();

	/*
	 * Do we have --cached and not have a pending object, then
	 * default to HEAD by hand.  Eek.
	 */
	if (!rev.pending.nr) {
		int i;
		for (i = 1; i < argc; i++) {
			const char *arg = argv[i];
			if (!strcmp(arg, "--"))
				break;
			else if (!strcmp(arg, "--cached") ||
				 !strcmp(arg, "--staged")) {
				add_head_to_pending(&rev);
				if (!rev.pending.nr)
					die("No HEAD commit to compare with (yet)");
				break;
			}
		}
	}

	for (i = 0; i < rev.pending.nr; i++) {
		struct object_array_entry *list = rev.pending.objects+i;
		struct object *obj = list->item;
		const char *name = list->name;
		int flags = (obj->flags & UNINTERESTING);
		if (!obj->parsed)
			obj = parse_object(obj->sha1);
		obj = deref_tag(obj, NULL, 0);
		if (!obj)
//.........这里部分代码省略.........

static void shortlog(const char *name, unsigned char *sha1,
		struct commit *head, struct rev_info *rev, int limit)
{
	int i, count = 0;
	struct commit *commit;
	struct object *branch;
	struct list subjects = { NULL, NULL, 0, 0 };
	int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;

	branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
	if (!branch || branch->type != OBJ_COMMIT)
		return;

	setup_revisions(0, NULL, rev, NULL);
	rev->ignore_merges = 1;
	add_pending_object(rev, branch, name);
	add_pending_object(rev, &head->object, "^HEAD");
	head->object.flags |= UNINTERESTING;
	if (prepare_revision_walk(rev))
		die("revision walk setup failed");
	while ((commit = get_revision(rev)) != NULL) {
		char *oneline, *bol, *eol;

		/* ignore merges */
		if (commit->parents && commit->parents->next)
			continue;

		count++;
		if (subjects.nr > limit)
			continue;

		bol = strstr(commit->buffer, "\n\n");
		if (bol) {
			unsigned char c;
			do {
				c = *++bol;
			} while (isspace(c));
			if (!c)
				bol = NULL;
		}

		if (!bol) {
			append_to_list(&subjects, xstrdup(sha1_to_hex(
							commit->object.sha1)),
					NULL);
			continue;
		}

		eol = strchr(bol, '\n');
		if (eol) {
			oneline = xmemdupz(bol, eol - bol);
		} else {
			oneline = xstrdup(bol);
		}
		append_to_list(&subjects, oneline, NULL);
	}

	if (count > limit)
		printf("\n* %s: (%d commits)\n", name, count);
	else
		printf("\n* %s:\n", name);

	for (i = 0; i < subjects.nr; i++)
		if (i >= limit)
			printf("  ...\n");
		else
			printf("  %s\n", subjects.list[i]);

	clear_commit_marks((struct commit *)branch, flags);
	clear_commit_marks(head, flags);
	free_commit_list(rev->commits);
	rev->commits = NULL;
	rev->pending.nr = 0;

	free_list(&subjects);
}

static void receive_needs(void)
{
	struct object_array shallows = OBJECT_ARRAY_INIT;
	int depth = 0;
	int has_non_tip = 0;

	shallow_nr = 0;
	for (;;) {
		struct object *o;
		const char *features;
		unsigned char sha1_buf[20];
		char *line = packet_read_line(0, NULL);
		reset_timeout();
		if (!line)
			break;

		if (starts_with(line, "shallow ")) {
			unsigned char sha1[20];
			struct object *object;
			if (get_sha1_hex(line + 8, sha1))
				die("invalid shallow line: %s", line);
			object = parse_object(sha1);
			if (!object)
				continue;
			if (object->type != OBJ_COMMIT)
				die("invalid shallow object %s", sha1_to_hex(sha1));
			if (!(object->flags & CLIENT_SHALLOW)) {
				object->flags |= CLIENT_SHALLOW;
				add_object_array(object, NULL, &shallows);
			}
			continue;
		}
		if (starts_with(line, "deepen ")) {
			char *end;
			depth = strtol(line + 7, &end, 0);
			if (end == line + 7 || depth <= 0)
				die("Invalid deepen: %s", line);
			continue;
		}
		if (!starts_with(line, "want ") ||
		    get_sha1_hex(line+5, sha1_buf))
			die("git upload-pack: protocol error, "
			    "expected to get sha, not '%s'", line);

		features = line + 45;

		if (parse_feature_request(features, "multi_ack_detailed"))
			multi_ack = 2;
		else if (parse_feature_request(features, "multi_ack"))
			multi_ack = 1;
		if (parse_feature_request(features, "no-done"))
			no_done = 1;
		if (parse_feature_request(features, "thin-pack"))
			use_thin_pack = 1;
		if (parse_feature_request(features, "ofs-delta"))
			use_ofs_delta = 1;
		if (parse_feature_request(features, "side-band-64k"))
			use_sideband = LARGE_PACKET_MAX;
		else if (parse_feature_request(features, "side-band"))
			use_sideband = DEFAULT_PACKET_MAX;
		if (parse_feature_request(features, "no-progress"))
			no_progress = 1;
		if (parse_feature_request(features, "include-tag"))
			use_include_tag = 1;

		o = parse_object(sha1_buf);
		if (!o)
			die("git upload-pack: not our ref %s",
			    sha1_to_hex(sha1_buf));
		if (!(o->flags & WANTED)) {
			o->flags |= WANTED;
			if (!is_our_ref(o))
				has_non_tip = 1;
			add_object_array(o, NULL, &want_obj);
		}
	}

	/*
	 * We have sent all our refs already, and the other end
	 * should have chosen out of them. When we are operating
	 * in the stateless RPC mode, however, their choice may
	 * have been based on the set of older refs advertised
	 * by another process that handled the initial request.
	 */
	if (has_non_tip)
		check_non_tip();

	if (!use_sideband && daemon_mode)
		no_progress = 1;

	if (depth == 0 && shallows.nr == 0)
		return;
	if (depth > 0) {
		struct commit_list *result = NULL, *backup = NULL;
		int i;
		if (depth == INFINITE_DEPTH && !is_repository_shallow())
			for (i = 0; i < shallows.nr; i++) {
				struct object *object = shallows.objects[i].item;
				object->flags |= NOT_SHALLOW;
			}
//.........这里部分代码省略.........

static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
				const char *placeholder,
				void *context)
{
	struct format_commit_context *c = context;
	const struct commit *commit = c->commit;
	const char *msg = c->message;
	struct commit_list *p;
	int h1, h2;

	/* these are independent of the commit */
	switch (placeholder[0]) {
	case 'C':
		if (starts_with(placeholder + 1, "(auto)")) {
			c->auto_color = 1;
			return 7; /* consumed 7 bytes, "C(auto)" */
		} else {
			int ret = parse_color(sb, placeholder, c);
			if (ret)
				c->auto_color = 0;
			/*
			 * Otherwise, we decided to treat %C<unknown>
			 * as a literal string, and the previous
			 * %C(auto) is still valid.
			 */
			return ret;
		}
	case 'n':		/* newline */
		strbuf_addch(sb, '\n');
		return 1;
	case 'x':
		/* %x00 == NUL, %x0a == LF, etc. */
		if (0 <= (h1 = hexval_table[0xff & placeholder[1]]) &&
		    h1 <= 16 &&
		    0 <= (h2 = hexval_table[0xff & placeholder[2]]) &&
		    h2 <= 16) {
			strbuf_addch(sb, (h1<<4)|h2);
			return 3;
		} else
			return 0;
	case 'w':
		if (placeholder[1] == '(') {
			unsigned long width = 0, indent1 = 0, indent2 = 0;
			char *next;
			const char *start = placeholder + 2;
			const char *end = strchr(start, ')');
			if (!end)
				return 0;
			if (end > start) {
				width = strtoul(start, &next, 10);
				if (*next == ',') {
					indent1 = strtoul(next + 1, &next, 10);
					if (*next == ',') {
						indent2 = strtoul(next + 1,
								 &next, 10);
					}
				}
				if (*next != ')')
					return 0;
			}
			rewrap_message_tail(sb, c, width, indent1, indent2);
			return end - placeholder + 1;
		} else
			return 0;

	case '<':
	case '>':
		return parse_padding_placeholder(sb, placeholder, c);
	}

	/* these depend on the commit */
	if (!commit->object.parsed)
		parse_object(commit->object.sha1);

	switch (placeholder[0]) {
	case 'H':		/* commit hash */
		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
		strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
		return 1;
	case 'h':		/* abbreviated commit hash */
		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
		if (add_again(sb, &c->abbrev_commit_hash)) {
			strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
			return 1;
		}
		strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
						     c->pretty_ctx->abbrev));
		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
		c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
		return 1;
	case 'T':		/* tree hash */
		strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
		return 1;
	case 't':		/* abbreviated tree hash */
		if (add_again(sb, &c->abbrev_tree_hash))
			return 1;
		strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
						     c->pretty_ctx->abbrev));
		c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
//.........这里部分代码省略.........

int verify_bundle(struct bundle_header *header, int verbose)
{
	/*
	 * Do fast check, then if any prereqs are missing then go line by line
	 * to be verbose about the errors
	 */
	struct ref_list *p = &header->prerequisites;
	struct rev_info revs;
	const char *argv[] = {NULL, "--all", NULL};
	struct object_array refs;
	struct commit *commit;
	int i, ret = 0, req_nr;
	const char *message = "Repository lacks these prerequisite commits:";

	init_revisions(&revs, NULL);
	for (i = 0; i < p->nr; i++) {
		struct ref_list_entry *e = p->list + i;
		struct object *o = parse_object(e->sha1);
		if (o) {
			o->flags |= PREREQ_MARK;
			add_pending_object(&revs, o, e->name);
			continue;
		}
		if (++ret == 1)
			error("%s", message);
		error("%s %s", sha1_to_hex(e->sha1), e->name);
	}
	if (revs.pending.nr != p->nr)
		return ret;
	req_nr = revs.pending.nr;
	setup_revisions(2, argv, &revs, NULL);

	memset(&refs, 0, sizeof(struct object_array));
	for (i = 0; i < revs.pending.nr; i++) {
		struct object_array_entry *e = revs.pending.objects + i;
		add_object_array(e->item, e->name, &refs);
	}

	if (prepare_revision_walk(&revs))
		die("revision walk setup failed");

	i = req_nr;
	while (i && (commit = get_revision(&revs)))
		if (commit->object.flags & PREREQ_MARK)
			i--;

	for (i = 0; i < req_nr; i++)
		if (!(refs.objects[i].item->flags & SHOWN)) {
			if (++ret == 1)
				error("%s", message);
			error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
				refs.objects[i].name);
		}

	for (i = 0; i < refs.nr; i++)
		clear_commit_marks((struct commit *)refs.objects[i].item, -1);

	if (verbose) {
		struct ref_list *r;

		r = &header->references;
		printf("The bundle contains %d ref%s\n",
		       r->nr, (1 < r->nr) ? "s" : "");
		list_refs(r, 0, NULL);
		r = &header->prerequisites;
		printf("The bundle requires these %d ref%s\n",
		       r->nr, (1 < r->nr) ? "s" : "");
		list_refs(r, 0, NULL);
	}
	return ret;
}

int write_ref_sha1(struct ref_lock *lock,
	const unsigned char *sha1, const char *logmsg)
{
	static char term = '\n';
	struct object *o;

	if (!lock)
		return -1;
	if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
		unlock_ref(lock);
		return 0;
	}
	o = parse_object(sha1);
	if (!o) {
		error("Trying to write ref %s with nonexistant object %s",
			lock->ref_name, sha1_to_hex(sha1));
		unlock_ref(lock);
		return -1;
	}
	if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
		error("Trying to write non-commit object %s to branch %s",
			sha1_to_hex(sha1), lock->ref_name);
		unlock_ref(lock);
		return -1;
	}
	if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
	    write_in_full(lock->lock_fd, &term, 1) != 1
		|| close_ref(lock) < 0) {
		error("Couldn't write %s", lock->lk->filename);
		unlock_ref(lock);
		return -1;
	}
	invalidate_cached_refs();
	if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
	    (strcmp(lock->ref_name, lock->orig_ref_name) &&
	     log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
		unlock_ref(lock);
		return -1;
	}
	if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
		/*
		 * Special hack: If a branch is updated directly and HEAD
		 * points to it (may happen on the remote side of a push
		 * for example) then logically the HEAD reflog should be
		 * updated too.
		 * A generic solution implies reverse symref information,
		 * but finding all symrefs pointing to the given branch
		 * would be rather costly for this rare event (the direct
		 * update of a branch) to be worth it.  So let's cheat and
		 * check with HEAD only which should cover 99% of all usage
		 * scenarios (even 100% of the default ones).
		 */
		unsigned char head_sha1[20];
		int head_flag;
		const char *head_ref;
		head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
		if (head_ref && (head_flag & REF_ISSYMREF) &&
		    !strcmp(head_ref, lock->ref_name))
			log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
	}
	if (commit_ref(lock)) {
		error("Couldn't set %s", lock->ref_name);
		unlock_ref(lock);
		return -1;
	}
	unlock_ref(lock);
	return 0;
}

static void
start_element (GMarkupParseContext *context,
               const gchar         *element_name,
               const gchar        **names,
               const gchar        **values,
               gpointer             user_data,
               GError             **error)
{
    ParserData *data = (ParserData*)user_data;

#ifdef GTK_ENABLE_DEBUG
    if (gtk_debug_flags & GTK_DEBUG_BUILDER)
    {
        GString *tags = g_string_new ("");
        int i;
        for (i = 0; names[i]; i++)
            g_string_append_printf (tags, "%s=\"%s\" ", names[i], values[i]);

        if (i)
        {
            g_string_insert_c (tags, 0, ' ');
            g_string_truncate (tags, tags->len - 1);
        }
        g_print ("<%s%s>\n", element_name, tags->str);
        g_string_free (tags, TRUE);
    }
#endif

    if (!data->last_element && strcmp (element_name, "interface") != 0)
    {
        g_set_error (error, GTK_BUILDER_ERROR,
                     GTK_BUILDER_ERROR_UNHANDLED_TAG,
                     _("Invalid root element: '%s'"),
                     element_name);
        return;
    }
    data->last_element = element_name;

    if (data->subparser)
        if (!subparser_start (context, element_name, names, values,
                              data, error))
            return;

    if (strcmp (element_name, "requires") == 0)
        parse_requires (data, element_name, names, values, error);
    else if (strcmp (element_name, "object") == 0)
        parse_object (context, data, element_name, names, values, error);
    else if (data->requested_objects && !data->inside_requested_object)
    {
        /* If outside a requested object, simply ignore this tag */
        return;
    }
    else if (strcmp (element_name, "child") == 0)
        parse_child (data, element_name, names, values, error);
    else if (strcmp (element_name, "property") == 0)
        parse_property (data, element_name, names, values, error);
    else if (strcmp (element_name, "signal") == 0)
        parse_signal (data, element_name, names, values, error);
    else if (strcmp (element_name, "interface") == 0)
        parse_interface (data, element_name, names, values, error);
    else if (strcmp (element_name, "placeholder") == 0)
    {
        /* placeholder has no special treatmeant, but it needs an
         * if clause to avoid an error below.
         */
    }
    else if (!parse_custom (context, element_name, names, values,
                            data, error))
        g_set_error (error, GTK_BUILDER_ERROR,
                     GTK_BUILDER_ERROR_UNHANDLED_TAG,
                     _("Unhandled tag: '%s'"),
                     element_name);
}

static const char *update(struct command *cmd)
{
	const char *name = cmd->ref_name;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;
	struct ref_lock *lock;

	/* only refs/... are allowed */
	if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
		error("refusing to create funny ref '%s' remotely", name);
		return "funny refname";
	}

	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
		error("unpack should have generated %s, "
		      "but I can't find it!", sha1_to_hex(new_sha1));
		return "bad pack";
	}
	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !prefixcmp(name, "refs/heads/")) {
		struct object *old_object, *new_object;
		struct commit *old_commit, *new_commit;
		struct commit_list *bases, *ent;

		old_object = parse_object(old_sha1);
		new_object = parse_object(new_sha1);

		if (!old_object || !new_object ||
		    old_object->type != OBJ_COMMIT ||
		    new_object->type != OBJ_COMMIT) {
			error("bad sha1 objects for %s", name);
			return "bad ref";
		}
		old_commit = (struct commit *)old_object;
		new_commit = (struct commit *)new_object;
		bases = get_merge_bases(old_commit, new_commit, 1);
		for (ent = bases; ent; ent = ent->next)
			if (!hashcmp(old_sha1, ent->item->object.sha1))
				break;
		free_commit_list(bases);
		if (!ent) {
			error("denying non-fast forward %s"
			      " (you should pull first)", name);
			return "non-fast forward";
		}
	}
	if (run_update_hook(cmd)) {
		error("hook declined to update %s", name);
		return "hook declined";
	}

	if (is_null_sha1(new_sha1)) {
		if (!parse_object(old_sha1)) {
			warning ("Allowing deletion of corrupt ref.");
			old_sha1 = NULL;
		}
		if (delete_ref(name, old_sha1)) {
			error("failed to delete %s", name);
			return "failed to delete";
		}
		return NULL; /* good */
	}
	else {
		lock = lock_any_ref_for_update(name, old_sha1, 0);
		if (!lock) {
			error("failed to lock %s", name);
			return "failed to lock";
		}
		if (write_ref_sha1(lock, new_sha1, "push")) {
			return "failed to write"; /* error() already called */
		}
		return NULL; /* good */
	}
}

int cmd_name_rev(int argc, const char **argv, const char *prefix)
{
	struct object_array revs = { 0, 0, NULL };
	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
	struct name_ref_data data = { 0, 0, NULL };
	struct option opts[] = {
		OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
		OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"),
		OPT_STRING(0, "refs", &data.ref_filter, "pattern",
				   "only use refs matching <pattern>"),
		OPT_GROUP(""),
		OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
		OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
		OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
		OPT_BOOLEAN(0, "always",     &always,
			   "show abbreviated commit object as fallback"),
		OPT_END(),
	};

	git_config(git_default_config, NULL);
	argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
	if (!!all + !!transform_stdin + !!argc > 1) {
		error("Specify either a list, or --all, not both!");
		usage_with_options(name_rev_usage, opts);
	}
	if (all || transform_stdin)
		cutoff = 0;

	for (; argc; argc--, argv++) {
		unsigned char sha1[20];
		struct object *o;
		struct commit *commit;

		if (get_sha1(*argv, sha1)) {
			fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
					*argv);
			continue;
		}

		o = deref_tag(parse_object(sha1), *argv, 0);
		if (!o || o->type != OBJ_COMMIT) {
			fprintf(stderr, "Could not get commit for %s. Skipping.\n",
					*argv);
			continue;
		}

		commit = (struct commit *)o;
		if (cutoff > commit->date)
			cutoff = commit->date;
		add_object_array((struct object *)commit, *argv, &revs);
	}

	if (cutoff)
		cutoff = cutoff - CUTOFF_DATE_SLOP;
	for_each_ref(name_ref, &data);

	if (transform_stdin) {
		char buffer[2048];

		while (!feof(stdin)) {
			char *p = fgets(buffer, sizeof(buffer), stdin);
			if (!p)
				break;
			name_rev_line(p, &data);
		}
	} else if (all) {
		int i, max;

		max = get_max_object_index();
		for (i = 0; i < max; i++) {
			struct object *obj = get_indexed_object(i);
			if (!obj)
				continue;
			show_name(obj, NULL,
				  always, allow_undefined, data.name_only);
		}
	} else {
		int i;
		for (i = 0; i < revs.nr; i++)
			show_name(revs.objects[i].item, revs.objects[i].name,
				  always, allow_undefined, data.name_only);
	}

	return 0;
}

static const char *update(struct command *cmd, struct shallow_info *si)
{
	const char *name = cmd->ref_name;
	struct strbuf namespaced_name_buf = STRBUF_INIT;
	const char *namespaced_name, *ret;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;

	/* only refs/... are allowed */
	if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
		rp_error("refusing to create funny ref '%s' remotely", name);
		return "funny refname";
	}

	strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
	namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);

	if (is_ref_checked_out(namespaced_name)) {
		switch (deny_current_branch) {
		case DENY_IGNORE:
			break;
		case DENY_WARN:
			rp_warning("updating the current branch");
			break;
		case DENY_REFUSE:
		case DENY_UNCONFIGURED:
			rp_error("refusing to update checked out branch: %s", name);
			if (deny_current_branch == DENY_UNCONFIGURED)
				refuse_unconfigured_deny();
			return "branch is currently checked out";
		case DENY_UPDATE_INSTEAD:
			ret = update_worktree(new_sha1);
			if (ret)
				return ret;
			break;
		}
	}

	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
		error("unpack should have generated %s, "
		      "but I can't find it!", sha1_to_hex(new_sha1));
		return "bad pack";
	}

	if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
		if (deny_deletes && starts_with(name, "refs/heads/")) {
			rp_error("denying ref deletion for %s", name);
			return "deletion prohibited";
		}

		if (head_name && !strcmp(namespaced_name, head_name)) {
			switch (deny_delete_current) {
			case DENY_IGNORE:
				break;
			case DENY_WARN:
				rp_warning("deleting the current branch");
				break;
			case DENY_REFUSE:
			case DENY_UNCONFIGURED:
			case DENY_UPDATE_INSTEAD:
				if (deny_delete_current == DENY_UNCONFIGURED)
					refuse_unconfigured_deny_delete_current();
				rp_error("refusing to delete the current branch: %s", name);
				return "deletion of the current branch prohibited";
			default:
				return "Invalid denyDeleteCurrent setting";
			}
		}
	}

	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    starts_with(name, "refs/heads/")) {
		struct object *old_object, *new_object;
		struct commit *old_commit, *new_commit;

		old_object = parse_object(old_sha1);
		new_object = parse_object(new_sha1);

		if (!old_object || !new_object ||
		    old_object->type != OBJ_COMMIT ||
		    new_object->type != OBJ_COMMIT) {
			error("bad sha1 objects for %s", name);
			return "bad ref";
		}
		old_commit = (struct commit *)old_object;
		new_commit = (struct commit *)new_object;
		if (!in_merge_bases(old_commit, new_commit)) {
			rp_error("denying non-fast-forward %s"
				 " (you should pull first)", name);
			return "non-fast-forward";
		}
	}
	if (run_update_hook(cmd)) {
		rp_error("hook declined to update %s", name);
		return "hook declined";
	}

	if (is_null_sha1(new_sha1)) {
		struct strbuf err = STRBUF_INIT;
//.........这里部分代码省略.........

/*** IDirectXFileEnumObject methods ***/
static HRESULT WINAPI IDirectXFileEnumObjectImpl_GetNextDataObject(IDirectXFileEnumObject* iface, LPDIRECTXFILEDATA* ppDataObj)
{
  IDirectXFileEnumObjectImpl *This = impl_from_IDirectXFileEnumObject(iface);
  IDirectXFileDataImpl* object;
  HRESULT hr;
  LPBYTE pstrings = NULL;

  TRACE("(%p/%p)->(%p)\n", This, iface, ppDataObj);

  if (This->nb_xobjects >= MAX_OBJECTS)
  {
    ERR("Too many objects\n");
    return DXFILEERR_NOMOREOBJECTS;
  }

  /* Check if there are templates defined before the object */
  if (!parse_templates(&This->buf)) {
    hr = DXFILEERR_BADVALUE;
    goto error;
  }

  if (!This->buf.rem_bytes)
    return DXFILEERR_NOMOREOBJECTS;

  hr = IDirectXFileDataImpl_Create(&object);
  if (FAILED(hr))
    return hr;

  This->buf.pxo_globals = This->xobjects;
  This->buf.nb_pxo_globals = This->nb_xobjects;
  This->buf.level = 0;

  This->buf.pxo_tab = HeapAlloc(GetProcessHeap(), 0, sizeof(xobject)*MAX_SUBOBJECTS);
  if (!This->buf.pxo_tab)
  {
    ERR("Out of memory\n");
    hr = DXFILEERR_BADALLOC;
    goto error;
  }
  This->buf.pxo = This->xobjects[This->nb_xobjects] = This->buf.pxo_tab;

  This->buf.pxo->pdata = This->buf.pdata = NULL;
  This->buf.capacity = 0;
  This->buf.cur_pos_data = 0;
  This->buf.pxo->nb_subobjects = 1;

  pstrings = HeapAlloc(GetProcessHeap(), 0, MAX_STRINGS_BUFFER);
  if (!pstrings)
  {
    ERR("Out of memory\n");
    hr = DXFILEERR_BADALLOC;
    goto error;
  }
  This->buf.cur_pstrings = This->buf.pstrings = object->pstrings = pstrings;

  if (!parse_object(&This->buf))
  {
    WARN("Object is not correct\n");
    hr = DXFILEERR_PARSEERROR;
    goto error;
  }

  object->pstrings = pstrings;
  object->pobj = This->buf.pxo;
  object->cur_enum_object = 0;
  object->level = 0;
  object->from_ref = FALSE;

  *ppDataObj = (LPDIRECTXFILEDATA)object;

  /* Get a reference to created object */
  This->pRefObjects[This->nb_xobjects] = (LPDIRECTXFILEDATA)object;
  IDirectXFileData_AddRef(This->pRefObjects[This->nb_xobjects]);

  This->nb_xobjects++;

  return DXFILE_OK;

error:

  HeapFree(GetProcessHeap(), 0, This->buf.pxo_tab);
  HeapFree(GetProcessHeap(), 0, This->buf.pdata);
  HeapFree(GetProcessHeap(), 0, pstrings);

  return hr;
}

//.........这里部分代码省略.........
				argv++;
				argc--;
				continue;
			}
			die(emsg_missing_argument, arg);
		}
		if (!strcmp("--full-name", arg)) {
			opt.relative = 0;
			continue;
		}
		if (!strcmp("--", arg)) {
			/* later processing wants to have this at argv[1] */
			argv--;
			argc++;
			break;
		}
		if (*arg == '-')
			usage(builtin_grep_usage);

		/* First unrecognized non-option token */
		if (!opt.pattern_list) {
			append_grep_pattern(&opt, arg, "command line", 0,
					    GREP_PATTERN);
			break;
		}
		else {
			/* We are looking at the first path or rev;
			 * it is found at argv[1] after leaving the
			 * loop.
			 */
			argc++; argv--;
			break;
		}
	}

	if (!opt.pattern_list)
		die("no pattern given.");
	if ((opt.regflags != REG_NEWLINE) && opt.fixed)
		die("cannot mix --fixed-strings and regexp");
	compile_grep_patterns(&opt);

	/* Check revs and then paths */
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		unsigned char sha1[20];
		/* Is it a rev? */
		if (!get_sha1(arg, sha1)) {
			struct object *object = parse_object(sha1);
			if (!object)
				die("bad object %s", arg);
			add_object_array(object, arg, &list);
			continue;
		}
		if (!strcmp(arg, "--")) {
			i++;
			seen_dashdash = 1;
		}
		break;
	}

	/* The rest are paths */
	if (!seen_dashdash) {
		int j;
		for (j = i; j < argc; j++)
			verify_filename(prefix, argv[j]);
	}

	if (i < argc) {
		paths = get_pathspec(prefix, argv + i);
		if (opt.prefix_length && opt.relative) {
			/* Make sure we do not get outside of paths */
			for (i = 0; paths[i]; i++)
				if (strncmp(prefix, paths[i], opt.prefix_length))
					die("git grep: cannot generate relative filenames containing '..'");
		}
	}
	else if (prefix) {
		paths = xcalloc(2, sizeof(const char *));
		paths[0] = prefix;
		paths[1] = NULL;
	}

	if (!list.nr) {
		if (!cached)
			setup_work_tree();
		return !grep_cache(&opt, paths, cached);
	}

	if (cached)
		die("both --cached and trees are given.");

	for (i = 0; i < list.nr; i++) {
		struct object *real_obj;
		real_obj = deref_tag(list.objects[i].item, NULL, 0);
		if (grep_object(&opt, paths, real_obj, list.objects[i].name))
			hit = 1;
	}
	free_grep_patterns(&opt);
	return !hit;
}

static int everything_local(struct fetch_pack_args *args,
			    struct ref **refs,
			    struct ref **sought, int nr_sought)
{
	struct ref *ref;
	int retval;
	unsigned long cutoff = 0;

	save_commit_buffer = 0;

	for (ref = *refs; ref; ref = ref->next) {
		struct object *o;

		if (!has_object_file(&ref->old_oid))
			continue;

		o = parse_object(ref->old_oid.hash);
		if (!o)
			continue;

		/* We already have it -- which may mean that we were
		 * in sync with the other side at some time after
		 * that (it is OK if we guess wrong here).
		 */
		if (o->type == OBJ_COMMIT) {
			struct commit *commit = (struct commit *)o;
			if (!cutoff || cutoff < commit->date)
				cutoff = commit->date;
		}
	}

	if (!args->depth) {
		for_each_ref(mark_complete_oid, NULL);
		for_each_alternate_ref(mark_alternate_complete, NULL);
		commit_list_sort_by_date(&complete);
		if (cutoff)
			mark_recent_complete_commits(args, cutoff);
	}

	/*
	 * Mark all complete remote refs as common refs.
	 * Don't mark them common yet; the server has to be told so first.
	 */
	for (ref = *refs; ref; ref = ref->next) {
		struct object *o = deref_tag(lookup_object(ref->old_oid.hash),
					     NULL, 0);

		if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
			continue;

		if (!(o->flags & SEEN)) {
			rev_list_push((struct commit *)o, COMMON_REF | SEEN);

			mark_common((struct commit *)o, 1, 1);
		}
	}

	filter_refs(args, refs, sought, nr_sought);

	for (retval = 1, ref = *refs; ref ; ref = ref->next) {
		const unsigned char *remote = ref->old_oid.hash;
		struct object *o;

		o = lookup_object(remote);
		if (!o || !(o->flags & COMPLETE)) {
			retval = 0;
			if (!args->verbose)
				continue;
			fprintf(stderr,
				"want %s (%s)\n", sha1_to_hex(remote),
				ref->name);
			continue;
		}
		if (!args->verbose)
			continue;
		fprintf(stderr,
			"already have %s (%s)\n", sha1_to_hex(remote),
			ref->name);
	}
	return retval;
}

static const char *update(struct command *cmd)
{
	const char *name = cmd->ref_name;
	struct strbuf namespaced_name_buf = STRBUF_INIT;
	const char *namespaced_name;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;
	struct ref_lock *lock;

	/* only refs/... are allowed */
	if (prefixcmp(name, "refs/") || check_refname_format(name + 5, 0)) {
		rp_error("refusing to create funny ref '%s' remotely", name);
		return "funny refname";
	}

	strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
	namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);

	if (is_ref_checked_out(namespaced_name)) {
		switch (deny_current_branch) {
		case DENY_IGNORE:
			break;
		case DENY_WARN:
			rp_warning("updating the current branch");
			break;
		case DENY_REFUSE:
		case DENY_UNCONFIGURED:
			rp_error("refusing to update checked out branch: %s", name);
			if (deny_current_branch == DENY_UNCONFIGURED)
				refuse_unconfigured_deny();
			return "branch is currently checked out";
		}
	}

	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
		error("unpack should have generated %s, "
		      "but I can't find it!", sha1_to_hex(new_sha1));
		return "bad pack";
	}

	if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
		if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
			rp_error("denying ref deletion for %s", name);
			return "deletion prohibited";
		}

		if (!strcmp(namespaced_name, head_name)) {
			switch (deny_delete_current) {
			case DENY_IGNORE:
				break;
			case DENY_WARN:
				rp_warning("deleting the current branch");
				break;
			case DENY_REFUSE:
			case DENY_UNCONFIGURED:
				if (deny_delete_current == DENY_UNCONFIGURED)
					refuse_unconfigured_deny_delete_current();
				rp_error("refusing to delete the current branch: %s", name);
				return "deletion of the current branch prohibited";
			}
		}
	}

	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !prefixcmp(name, "refs/heads/")) {
		struct object *old_object, *new_object;
		struct commit *old_commit, *new_commit;
		struct commit_list *bases, *ent;

		old_object = parse_object(old_sha1);
		new_object = parse_object(new_sha1);

		if (!old_object || !new_object ||
		    old_object->type != OBJ_COMMIT ||
		    new_object->type != OBJ_COMMIT) {
			error("bad sha1 objects for %s", name);
			return "bad ref";
		}
		old_commit = (struct commit *)old_object;
		new_commit = (struct commit *)new_object;
		bases = get_merge_bases(old_commit, new_commit, 1);
		for (ent = bases; ent; ent = ent->next)
			if (!hashcmp(old_sha1, ent->item->object.sha1))
				break;
		free_commit_list(bases);
		if (!ent) {
			rp_error("denying non-fast-forward %s"
				 " (you should pull first)", name);
			return "non-fast-forward";
		}
	}
	if (run_update_hook(cmd)) {
		rp_error("hook declined to update %s", name);
		return "hook declined";
	}

	if (is_null_sha1(new_sha1)) {
		if (!parse_object(old_sha1)) {
			old_sha1 = NULL;
//.........这里部分代码省略.........

/* parse layers and objectgroups */
static int parse_layer(xmlTextReaderPtr reader, tmx_layer **layer_headadr, int map_h, int map_w, enum tmx_layer_type type, const char *filename) {
	tmx_layer *res;
	tmx_object *obj;
	int curr_depth;
	const char *name;
	char *value;

	curr_depth = xmlTextReaderDepth(reader);

	if (!(res = alloc_layer())) return 0;
	res->type = type;
	while(*layer_headadr) {
		layer_headadr = &((*layer_headadr)->next);
	}
	*layer_headadr = res;

	/* parses each attribute */
	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"name"))) { /* name */
		res->name = value;
	} else {
		tmx_err(E_MISSEL, "xml parser: missing 'name' attribute in the 'layer' element");
		return 0;
	}

	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"visible"))) { /* visible */
		res->visible = (char)atoi(value);
		tmx_free_func(value);
	}

	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"opacity"))) { /* opacity */
		res->opacity = (float)strtod(value, NULL);
		tmx_free_func(value);
	}

	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"color"))) { /* color */
		res->color = get_color_rgb(value);
		tmx_free_func(value);
	}

	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"x"))) { /* x_offset */
		res->x_offset = (int)atoi(value);
		tmx_free_func(value);
	}

	if ((value = (char*)xmlTextReaderGetAttribute(reader, (xmlChar*)"y"))) { /* y_offset */
		res->y_offset = (int)atoi(value);
		tmx_free_func(value);
	}

	do {
		if (xmlTextReaderRead(reader) != 1