1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/uio.h>
20 #include <sys/socket.h>
21 #include <sys/wait.h>
22 
23 #include <errno.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <stdint.h>
28 #include <zlib.h>
29 #include <ctype.h>
30 #include <limits.h>
31 #include <time.h>
32 #include <unistd.h>
33 
34 #include "got_compat.h"
35 
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_repository.h"
39 #include "got_opentemp.h"
40 #include "got_path.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_object_cache.h"
48 #include "got_lib_pack.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_repository.h"
51 
52 #ifndef nitems
53 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
54 #endif
55 
56 struct got_object_id *
57 got_object_id_dup(struct got_object_id *id1)
58 {
59 	struct got_object_id *id2;
60 
61 	id2 = malloc(sizeof(*id2));
62 	if (id2 == NULL)
63 		return NULL;
64 	memcpy(id2, id1, sizeof(*id2));
65 	return id2;
66 }
67 
68 int
69 got_object_id_cmp(const struct got_object_id *id1,
70     const struct got_object_id *id2)
71 {
72 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
73 }
74 
75 const struct got_error *
76 got_object_qid_alloc_partial(struct got_object_qid **qid)
77 {
78 	const struct got_error *err = NULL;
79 
80 	*qid = malloc(sizeof(**qid));
81 	if (*qid == NULL)
82 		return got_error_from_errno("malloc");
83 
84 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
85 	if ((*qid)->id == NULL) {
86 		err = got_error_from_errno("malloc");
87 		got_object_qid_free(*qid);
88 		*qid = NULL;
89 		return err;
90 	}
91 	(*qid)->data = NULL;
92 
93 	return NULL;
94 }
95 
96 const struct got_error *
97 got_object_id_str(char **outbuf, struct got_object_id *id)
98 {
99 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
100 
101 	*outbuf = malloc(len);
102 	if (*outbuf == NULL)
103 		return got_error_from_errno("malloc");
104 
105 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
106 		free(*outbuf);
107 		*outbuf = NULL;
108 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
109 	}
110 
111 	return NULL;
112 }
113 
114 void
115 got_object_close(struct got_object *obj)
116 {
117 	if (obj->refcnt > 0) {
118 		obj->refcnt--;
119 		if (obj->refcnt > 0)
120 			return;
121 	}
122 
123 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
124 		struct got_delta *delta;
125 		while (!STAILQ_EMPTY(&obj->deltas.entries)) {
126 			delta = STAILQ_FIRST(&obj->deltas.entries);
127 			STAILQ_REMOVE_HEAD(&obj->deltas.entries, entry);
128 			free(delta);
129 		}
130 	}
131 	free(obj);
132 }
133 
134 const struct got_error *
135 got_object_raw_close(struct got_raw_object *obj)
136 {
137 	const struct got_error *err = NULL;
138 
139 	if (obj->refcnt > 0) {
140 		obj->refcnt--;
141 		if (obj->refcnt > 0)
142 			return NULL;
143 	}
144 
145 	if (obj->f != NULL && fclose(obj->f) == EOF && err == NULL)
146 		err = got_error_from_errno("fclose");
147 	free(obj->data);
148 	free(obj);
149 	return err;
150 }
151 
152 void
153 got_object_qid_free(struct got_object_qid *qid)
154 {
155 	free(qid->id);
156 	free(qid);
157 }
158 
159 void
160 got_object_id_queue_free(struct got_object_id_queue *ids)
161 {
162 	struct got_object_qid *qid;
163 
164 	while (!STAILQ_EMPTY(ids)) {
165 		qid = STAILQ_FIRST(ids);
166 		STAILQ_REMOVE_HEAD(ids, entry);
167 		got_object_qid_free(qid);
168 	}
169 }
170 
171 const struct got_error *
172 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
173 {
174 	const char *obj_labels[] = {
175 		GOT_OBJ_LABEL_COMMIT,
176 		GOT_OBJ_LABEL_TREE,
177 		GOT_OBJ_LABEL_BLOB,
178 		GOT_OBJ_LABEL_TAG,
179 	};
180 	const int obj_types[] = {
181 		GOT_OBJ_TYPE_COMMIT,
182 		GOT_OBJ_TYPE_TREE,
183 		GOT_OBJ_TYPE_BLOB,
184 		GOT_OBJ_TYPE_TAG,
185 	};
186 	int type = 0;
187 	size_t size = 0, hdrlen = 0;
188 	size_t i;
189 
190 	*obj = NULL;
191 
192 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
193 	if (hdrlen > len)
194 		return got_error(GOT_ERR_BAD_OBJ_HDR);
195 
196 	for (i = 0; i < nitems(obj_labels); i++) {
197 		const char *label = obj_labels[i];
198 		size_t label_len = strlen(label);
199 		const char *errstr;
200 
201 		if (strncmp(buf, label, label_len) != 0)
202 			continue;
203 
204 		type = obj_types[i];
205 		if (len <= label_len)
206 			return got_error(GOT_ERR_BAD_OBJ_HDR);
207 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
208 		if (errstr != NULL)
209 			return got_error(GOT_ERR_BAD_OBJ_HDR);
210 		break;
211 	}
212 
213 	if (type == 0)
214 		return got_error(GOT_ERR_BAD_OBJ_HDR);
215 
216 	*obj = calloc(1, sizeof(**obj));
217 	if (*obj == NULL)
218 		return got_error_from_errno("calloc");
219 	(*obj)->type = type;
220 	(*obj)->hdrlen = hdrlen;
221 	(*obj)->size = size;
222 	return NULL;
223 }
224 
225 const struct got_error *
226 got_object_read_header(struct got_object **obj, int fd)
227 {
228 	const struct got_error *err;
229 	struct got_inflate_buf zb;
230 	uint8_t *buf;
231 	const size_t zbsize = 64;
232 	size_t outlen, totlen;
233 	int nbuf = 1;
234 
235 	*obj = NULL;
236 
237 	buf = malloc(zbsize);
238 	if (buf == NULL)
239 		return got_error_from_errno("malloc");
240 
241 	err = got_inflate_init(&zb, buf, zbsize, NULL);
242 	if (err)
243 		return err;
244 
245 	totlen = 0;
246 	do {
247 		err = got_inflate_read_fd(&zb, fd, &outlen, NULL);
248 		if (err)
249 			goto done;
250 		if (outlen == 0)
251 			break;
252 		totlen += outlen;
253 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
254 			uint8_t *newbuf;
255 			nbuf++;
256 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
257 			if (newbuf == NULL) {
258 				err = got_error_from_errno("recallocarray");
259 				goto done;
260 			}
261 			buf = newbuf;
262 			zb.outbuf = newbuf + totlen;
263 			zb.outlen = (nbuf * zbsize) - totlen;
264 		}
265 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
266 
267 	err = got_object_parse_header(obj, buf, totlen);
268 done:
269 	free(buf);
270 	got_inflate_end(&zb);
271 	return err;
272 }
273 
274 struct got_commit_object *
275 got_object_commit_alloc_partial(void)
276 {
277 	struct got_commit_object *commit;
278 
279 	commit = calloc(1, sizeof(*commit));
280 	if (commit == NULL)
281 		return NULL;
282 	commit->tree_id = malloc(sizeof(*commit->tree_id));
283 	if (commit->tree_id == NULL) {
284 		free(commit);
285 		return NULL;
286 	}
287 
288 	STAILQ_INIT(&commit->parent_ids);
289 
290 	return commit;
291 }
292 
293 const struct got_error *
294 got_object_commit_add_parent(struct got_commit_object *commit,
295     const char *id_str)
296 {
297 	const struct got_error *err = NULL;
298 	struct got_object_qid *qid;
299 
300 	err = got_object_qid_alloc_partial(&qid);
301 	if (err)
302 		return err;
303 
304 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
305 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
306 		got_object_qid_free(qid);
307 		return err;
308 	}
309 
310 	STAILQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
311 	commit->nparents++;
312 
313 	return NULL;
314 }
315 
316 static const struct got_error *
317 parse_gmtoff(time_t *gmtoff, const char *tzstr)
318 {
319 	int sign = 1;
320 	const char *p = tzstr;
321 	time_t h, m;
322 
323 	*gmtoff = 0;
324 
325 	if (*p == '-')
326 		sign = -1;
327 	else if (*p != '+')
328 		return got_error(GOT_ERR_BAD_OBJ_DATA);
329 	p++;
330 	if (!isdigit(*p) && !isdigit(*(p + 1)))
331 		return got_error(GOT_ERR_BAD_OBJ_DATA);
332 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
333 
334 	p += 2;
335 	if (!isdigit(*p) && !isdigit(*(p + 1)))
336 		return got_error(GOT_ERR_BAD_OBJ_DATA);
337 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
338 
339 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
340 	return NULL;
341 }
342 
343 static const struct got_error *
344 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
345 {
346 	const struct got_error *err = NULL;
347 	const char *errstr;
348 	char *space, *tzstr;
349 
350 	/* Parse and strip off trailing timezone indicator string. */
351 	space = strrchr(committer, ' ');
352 	if (space == NULL)
353 		return got_error(GOT_ERR_BAD_OBJ_DATA);
354 	tzstr = strdup(space + 1);
355 	if (tzstr == NULL)
356 		return got_error_from_errno("strdup");
357 	err = parse_gmtoff(gmtoff, tzstr);
358 	free(tzstr);
359 	if (err) { 
360 		if (err->code != GOT_ERR_BAD_OBJ_DATA)
361 			return err;
362 		/* Old versions of Git omitted the timestamp. */
363 		*time = 0;
364 		*gmtoff = 0;
365 		return NULL;
366 	}
367 	*space = '\0';
368 
369 	/* Timestamp is separated from committer name + email by space. */
370 	space = strrchr(committer, ' ');
371 	if (space == NULL)
372 		return got_error(GOT_ERR_BAD_OBJ_DATA);
373 
374 	/* Timestamp parsed here is expressed as UNIX timestamp (UTC). */
375 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
376 	if (errstr)
377 		return got_error(GOT_ERR_BAD_OBJ_DATA);
378 
379 	/* Strip off parsed time information, leaving just author and email. */
380 	*space = '\0';
381 
382 	return NULL;
383 }
384 
385 void
386 got_object_commit_close(struct got_commit_object *commit)
387 {
388 	if (commit->refcnt > 0) {
389 		commit->refcnt--;
390 		if (commit->refcnt > 0)
391 			return;
392 	}
393 
394 	got_object_id_queue_free(&commit->parent_ids);
395 	free(commit->tree_id);
396 	free(commit->author);
397 	free(commit->committer);
398 	free(commit->logmsg);
399 	free(commit);
400 }
401 
402 struct got_object_id *
403 got_object_commit_get_tree_id(struct got_commit_object *commit)
404 {
405 	return commit->tree_id;
406 }
407 
408 int
409 got_object_commit_get_nparents(struct got_commit_object *commit)
410 {
411 	return commit->nparents;
412 }
413 
414 const struct got_object_id_queue *
415 got_object_commit_get_parent_ids(struct got_commit_object *commit)
416 {
417 	return &commit->parent_ids;
418 }
419 
420 const char *
421 got_object_commit_get_author(struct got_commit_object *commit)
422 {
423 	return commit->author;
424 }
425 
426 time_t
427 got_object_commit_get_author_time(struct got_commit_object *commit)
428 {
429 	return commit->author_time;
430 }
431 
432 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
433 {
434 	return commit->author_gmtoff;
435 }
436 
437 const char *
438 got_object_commit_get_committer(struct got_commit_object *commit)
439 {
440 	return commit->committer;
441 }
442 
443 time_t
444 got_object_commit_get_committer_time(struct got_commit_object *commit)
445 {
446 	return commit->committer_time;
447 }
448 
449 time_t
450 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
451 {
452 	return commit->committer_gmtoff;
453 }
454 
455 const struct got_error *
456 got_object_commit_get_logmsg(char **logmsg, struct got_commit_object *commit)
457 {
458 	const struct got_error *err = NULL;
459 	const char *src;
460 	char *dst;
461 	size_t len;
462 
463 	len = strlen(commit->logmsg);
464 	*logmsg = malloc(len + 2); /* leave room for a trailing \n and \0 */
465 	if (*logmsg == NULL)
466 		return got_error_from_errno("malloc");
467 
468 	/*
469 	 * Strip out unusual headers. Headers are separated from the commit
470 	 * message body by a single empty line.
471 	 */
472 	src = commit->logmsg;
473 	dst = *logmsg;
474 	while (*src != '\0' && *src != '\n') {
475 		int copy_header = 1, eol = 0;
476 		if (strncmp(src, GOT_COMMIT_LABEL_TREE,
477 		    strlen(GOT_COMMIT_LABEL_TREE)) != 0 &&
478 		    strncmp(src, GOT_COMMIT_LABEL_AUTHOR,
479 		    strlen(GOT_COMMIT_LABEL_AUTHOR)) != 0 &&
480 		    strncmp(src, GOT_COMMIT_LABEL_PARENT,
481 		    strlen(GOT_COMMIT_LABEL_PARENT)) != 0 &&
482 		    strncmp(src, GOT_COMMIT_LABEL_COMMITTER,
483 		    strlen(GOT_COMMIT_LABEL_COMMITTER)) != 0)
484 			copy_header = 0;
485 
486 		while (*src != '\0' && !eol) {
487 			if (copy_header) {
488 				*dst = *src;
489 				dst++;
490 			}
491 			if (*src == '\n')
492 				eol = 1;
493 			src++;
494 		}
495 	}
496 	*dst = '\0';
497 
498 	if (strlcat(*logmsg, src, len + 1) >= len + 1) {
499 		err = got_error(GOT_ERR_NO_SPACE);
500 		goto done;
501 	}
502 
503 	/* Trim redundant trailing whitespace. */
504 	len = strlen(*logmsg);
505 	while (len > 1 && isspace((unsigned char)(*logmsg)[len - 2]) &&
506 	    isspace((unsigned char)(*logmsg)[len - 1])) {
507 		(*logmsg)[len - 1] = '\0';
508 		len--;
509 	}
510 
511 	/* Append a trailing newline if missing. */
512 	if (len > 0 && (*logmsg)[len - 1] != '\n') {
513 		(*logmsg)[len] = '\n';
514 		(*logmsg)[len + 1] = '\0';
515 	}
516 done:
517 	if (err) {
518 		free(*logmsg);
519 		*logmsg = NULL;
520 	}
521 	return err;
522 }
523 
524 const char *
525 got_object_commit_get_logmsg_raw(struct got_commit_object *commit)
526 {
527 	return commit->logmsg;
528 }
529 
530 const struct got_error *
531 got_object_parse_commit(struct got_commit_object **commit, char *buf,
532     size_t len)
533 {
534 	const struct got_error *err = NULL;
535 	char *s = buf;
536 	size_t label_len;
537 	ssize_t remain = (ssize_t)len;
538 
539 	if (remain == 0)
540 		return got_error(GOT_ERR_BAD_OBJ_DATA);
541 
542 	*commit = got_object_commit_alloc_partial();
543 	if (*commit == NULL)
544 		return got_error_from_errno("got_object_commit_alloc_partial");
545 
546 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
547 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
548 		remain -= label_len;
549 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
550 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
551 			goto done;
552 		}
553 		s += label_len;
554 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
555 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
556 			goto done;
557 		}
558 		remain -= SHA1_DIGEST_STRING_LENGTH;
559 		s += SHA1_DIGEST_STRING_LENGTH;
560 	} else {
561 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
562 		goto done;
563 	}
564 
565 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
566 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
567 		remain -= label_len;
568 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
569 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
570 			goto done;
571 		}
572 		s += label_len;
573 		err = got_object_commit_add_parent(*commit, s);
574 		if (err)
575 			goto done;
576 
577 		remain -= SHA1_DIGEST_STRING_LENGTH;
578 		s += SHA1_DIGEST_STRING_LENGTH;
579 	}
580 
581 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
582 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
583 		char *p;
584 		size_t slen;
585 
586 		remain -= label_len;
587 		if (remain <= 0) {
588 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
589 			goto done;
590 		}
591 		s += label_len;
592 		p = memchr(s, '\n', remain);
593 		if (p == NULL) {
594 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
595 			goto done;
596 		}
597 		*p = '\0';
598 		slen = strlen(s);
599 		err = parse_commit_time(&(*commit)->author_time,
600 		    &(*commit)->author_gmtoff, s);
601 		if (err)
602 			goto done;
603 		(*commit)->author = strdup(s);
604 		if ((*commit)->author == NULL) {
605 			err = got_error_from_errno("strdup");
606 			goto done;
607 		}
608 		s += slen + 1;
609 		remain -= slen + 1;
610 	}
611 
612 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
613 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
614 		char *p;
615 		size_t slen;
616 
617 		remain -= label_len;
618 		if (remain <= 0) {
619 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
620 			goto done;
621 		}
622 		s += label_len;
623 		p = memchr(s, '\n', remain);
624 		if (p == NULL) {
625 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
626 			goto done;
627 		}
628 		*p = '\0';
629 		slen = strlen(s);
630 		err = parse_commit_time(&(*commit)->committer_time,
631 		    &(*commit)->committer_gmtoff, s);
632 		if (err)
633 			goto done;
634 		(*commit)->committer = strdup(s);
635 		if ((*commit)->committer == NULL) {
636 			err = got_error_from_errno("strdup");
637 			goto done;
638 		}
639 		s += slen + 1;
640 		remain -= slen + 1;
641 	}
642 
643 	(*commit)->logmsg = strndup(s, remain);
644 	if ((*commit)->logmsg == NULL) {
645 		err = got_error_from_errno("strndup");
646 		goto done;
647 	}
648 done:
649 	if (err) {
650 		got_object_commit_close(*commit);
651 		*commit = NULL;
652 	}
653 	return err;
654 }
655 
656 void
657 got_object_tree_close(struct got_tree_object *tree)
658 {
659 	if (tree->refcnt > 0) {
660 		tree->refcnt--;
661 		if (tree->refcnt > 0)
662 			return;
663 	}
664 
665 	free(tree->entries);
666 	free(tree);
667 }
668 
669 static const struct got_error *
670 parse_tree_entry(struct got_parsed_tree_entry **pte, const char **name,
671     size_t *elen, char *buf,
672     size_t maxlen)
673 {
674 	char *p, *space;
675 	const struct got_error *err = NULL;
676 
677 	*name = NULL;
678 	*elen = 0;
679 
680 	*pte = malloc(sizeof(**pte));
681 	if (*pte == NULL)
682 		return got_error_from_errno("malloc");
683 
684 	*elen = strnlen(buf, maxlen) + 1;
685 	if (*elen > maxlen) {
686 		free(*pte);
687 		*pte = NULL;
688 		return got_error(GOT_ERR_BAD_OBJ_DATA);
689 	}
690 
691 	space = memchr(buf, ' ', *elen);
692 	if (space == NULL || space <= buf) {
693 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
694 		free(*pte);
695 		*pte = NULL;
696 		return err;
697 	}
698 	(*pte)->mode = 0;
699 	p = buf;
700 	while (p < space) {
701 		if (*p < '0' && *p > '7') {
702 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
703 			goto done;
704 		}
705 		(*pte)->mode <<= 3;
706 		(*pte)->mode |= *p - '0';
707 		p++;
708 	}
709 
710 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
711 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
712 		goto done;
713 	}
714 	*name = space + 1;
715 	buf += *elen;
716 	(*pte)->id = buf;
717 	*elen += SHA1_DIGEST_LENGTH;
718 done:
719 	if (err) {
720 		free(*pte);
721 		*pte = NULL;
722 	}
723 	return err;
724 }
725 
726 const struct got_error *
727 got_object_parse_tree(struct got_pathlist_head *entries, int *nentries,
728     uint8_t *buf, size_t len)
729 {
730 	const struct got_error *err = NULL;
731 	size_t remain = len;
732 
733 	*nentries = 0;
734 	if (remain == 0)
735 		return NULL; /* tree is empty */
736 
737 	while (remain > 0) {
738 		struct got_parsed_tree_entry *pte;
739 		struct got_pathlist_entry *new = NULL;
740 		const char *name;
741 		size_t elen;
742 
743 		err = parse_tree_entry(&pte, &name, &elen, buf, remain);
744 		if (err)
745 			goto done;
746 		err = got_pathlist_insert(&new, entries, name, pte);
747 		if (err)
748 			goto done;
749 		if (new == NULL) {
750 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
751 			goto done;
752 		}
753 		buf += elen;
754 		remain -= elen;
755 		(*nentries)++;
756 	}
757 
758 	if (remain != 0) {
759 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
760 		goto done;
761 	}
762 done:
763 	if (err) {
764 		got_object_parsed_tree_entries_free(entries);
765 		*nentries = 0;
766 	}
767 	return err;
768 }
769 
770 void
771 got_object_parsed_tree_entries_free(struct got_pathlist_head *entries)
772 {
773 	struct got_pathlist_entry *pe;
774 
775 	TAILQ_FOREACH(pe, entries, entry) {
776 		struct got_parsed_tree_entry *pte = pe->data;
777 		free(pte);
778 	}
779 	got_pathlist_free(entries);
780 }
781 
782 void
783 got_object_tag_close(struct got_tag_object *tag)
784 {
785 	if (tag->refcnt > 0) {
786 		tag->refcnt--;
787 		if (tag->refcnt > 0)
788 			return;
789 	}
790 
791 	free(tag->tag);
792 	free(tag->tagger);
793 	free(tag->tagmsg);
794 	free(tag);
795 }
796 
797 const struct got_error *
798 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
799 {
800 	const struct got_error *err = NULL;
801 	size_t remain = len;
802 	char *s = buf;
803 	size_t label_len;
804 
805 	if (remain == 0)
806 		return got_error(GOT_ERR_BAD_OBJ_DATA);
807 
808 	*tag = calloc(1, sizeof(**tag));
809 	if (*tag == NULL)
810 		return got_error_from_errno("calloc");
811 
812 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
813 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
814 		remain -= label_len;
815 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
816 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
817 			goto done;
818 		}
819 		s += label_len;
820 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
821 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
822 			goto done;
823 		}
824 		remain -= SHA1_DIGEST_STRING_LENGTH;
825 		s += SHA1_DIGEST_STRING_LENGTH;
826 	} else {
827 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
828 		goto done;
829 	}
830 
831 	if (remain <= 0) {
832 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
833 		goto done;
834 	}
835 
836 	label_len = strlen(GOT_TAG_LABEL_TYPE);
837 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
838 		remain -= label_len;
839 		if (remain <= 0) {
840 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
841 			goto done;
842 		}
843 		s += label_len;
844 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
845 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
846 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
847 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
848 			s += label_len;
849 			remain -= label_len;
850 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
851 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
852 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
853 			label_len = strlen(GOT_OBJ_LABEL_TREE);
854 			s += label_len;
855 			remain -= label_len;
856 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
857 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
858 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
859 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
860 			s += label_len;
861 			remain -= label_len;
862 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
863 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
864 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
865 			label_len = strlen(GOT_OBJ_LABEL_TAG);
866 			s += label_len;
867 			remain -= label_len;
868 		} else {
869 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
870 			goto done;
871 		}
872 
873 		if (remain <= 0 || *s != '\n') {
874 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
875 			goto done;
876 		}
877 		s++;
878 		remain--;
879 		if (remain <= 0) {
880 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
881 			goto done;
882 		}
883 	} else {
884 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
885 		goto done;
886 	}
887 
888 	label_len = strlen(GOT_TAG_LABEL_TAG);
889 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
890 		char *p;
891 		size_t slen;
892 		remain -= label_len;
893 		if (remain <= 0) {
894 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
895 			goto done;
896 		}
897 		s += label_len;
898 		p = memchr(s, '\n', remain);
899 		if (p == NULL) {
900 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
901 			goto done;
902 		}
903 		*p = '\0';
904 		slen = strlen(s);
905 		(*tag)->tag = strndup(s, slen);
906 		if ((*tag)->tag == NULL) {
907 			err = got_error_from_errno("strndup");
908 			goto done;
909 		}
910 		s += slen + 1;
911 		remain -= slen + 1;
912 		if (remain <= 0) {
913 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
914 			goto done;
915 		}
916 	} else {
917 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
918 		goto done;
919 	}
920 
921 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
922 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
923 		char *p;
924 		size_t slen;
925 
926 		remain -= label_len;
927 		if (remain <= 0) {
928 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
929 			goto done;
930 		}
931 		s += label_len;
932 		p = memchr(s, '\n', remain);
933 		if (p == NULL) {
934 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
935 			goto done;
936 		}
937 		*p = '\0';
938 		slen = strlen(s);
939 		err = parse_commit_time(&(*tag)->tagger_time,
940 		    &(*tag)->tagger_gmtoff, s);
941 		if (err)
942 			goto done;
943 		(*tag)->tagger = strdup(s);
944 		if ((*tag)->tagger == NULL) {
945 			err = got_error_from_errno("strdup");
946 			goto done;
947 		}
948 		s += slen + 1;
949 		remain -= slen + 1;
950 		if (remain < 0) {
951 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
952 			goto done;
953 		}
954 	} else {
955 		/* Some old tags in the Linux git repo have no tagger. */
956 		(*tag)->tagger = strdup("");
957 		if ((*tag)->tagger == NULL) {
958 			err = got_error_from_errno("strdup");
959 			goto done;
960 		}
961 	}
962 
963 	(*tag)->tagmsg = strndup(s, remain);
964 	if ((*tag)->tagmsg == NULL) {
965 		err = got_error_from_errno("strndup");
966 		goto done;
967 	}
968 done:
969 	if (err) {
970 		got_object_tag_close(*tag);
971 		*tag = NULL;
972 	}
973 	return err;
974 }
975 
976 const struct got_error *
977 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
978 {
979 	const struct got_error *err = NULL;
980 	static const size_t blocksize = 512;
981 	size_t n, total, remain;
982 	uint8_t *buf;
983 
984 	*outbuf = NULL;
985 	*outlen = 0;
986 
987 	buf = malloc(blocksize);
988 	if (buf == NULL)
989 		return got_error_from_errno("malloc");
990 
991 	remain = blocksize;
992 	total = 0;
993 	for (;;) {
994 		if (remain == 0) {
995 			uint8_t *newbuf;
996 			newbuf = reallocarray(buf, 1, total + blocksize);
997 			if (newbuf == NULL) {
998 				err = got_error_from_errno("reallocarray");
999 				goto done;
1000 			}
1001 			buf = newbuf;
1002 			remain += blocksize;
1003 		}
1004 		n = fread(buf + total, 1, remain, f);
1005 		if (n == 0) {
1006 			if (ferror(f)) {
1007 				err = got_ferror(f, GOT_ERR_IO);
1008 				goto done;
1009 			}
1010 			break; /* EOF */
1011 		}
1012 		remain -= n;
1013 		total += n;
1014 	};
1015 
1016 done:
1017 	if (err == NULL) {
1018 		*outbuf = buf;
1019 		*outlen = total;
1020 	} else
1021 		free(buf);
1022 	return err;
1023 }