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Date:: Fri Oct 15 09:24:56 2021 UTC
Message:: raw object blocksize and read buffer were unused; remove them
Actions:: History | Blame | Raw File
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/queue.h>
20 #include <sys/tree.h>
21 #include <sys/uio.h>
22 #include <sys/socket.h>
23 #include <sys/wait.h>
24 
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <ctype.h>
33 #include <limits.h>
34 #include <imsg.h>
35 #include <time.h>
36 #include <unistd.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_repository.h"
41 #include "got_opentemp.h"
42 #include "got_path.h"
43 
44 #include "got_lib_sha1.h"
45 #include "got_lib_delta.h"
46 #include "got_lib_inflate.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_parse.h"
49 #include "got_lib_object_cache.h"
50 #include "got_lib_pack.h"
51 #include "got_lib_privsep.h"
52 #include "got_lib_repository.h"
53 
54 #ifndef nitems
55 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
56 #endif
57 
58 struct got_object_id *
59 got_object_id_dup(struct got_object_id *id1)
60 {
61 	struct got_object_id *id2;
62 
63 	id2 = malloc(sizeof(*id2));
64 	if (id2 == NULL)
65 		return NULL;
66 	memcpy(id2, id1, sizeof(*id2));
67 	return id2;
68 }
69 
70 int
71 got_object_id_cmp(const struct got_object_id *id1,
72     const struct got_object_id *id2)
73 {
74 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
75 }
76 
77 const struct got_error *
78 got_object_qid_alloc_partial(struct got_object_qid **qid)
79 {
80 	const struct got_error *err = NULL;
81 
82 	*qid = malloc(sizeof(**qid));
83 	if (*qid == NULL)
84 		return got_error_from_errno("malloc");
85 
86 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
87 	if ((*qid)->id == NULL) {
88 		err = got_error_from_errno("malloc");
89 		got_object_qid_free(*qid);
90 		*qid = NULL;
91 		return err;
92 	}
93 	(*qid)->data = NULL;
94 
95 	return NULL;
96 }
97 
98 const struct got_error *
99 got_object_id_str(char **outbuf, struct got_object_id *id)
100 {
101 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
102 
103 	*outbuf = malloc(len);
104 	if (*outbuf == NULL)
105 		return got_error_from_errno("malloc");
106 
107 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
108 		free(*outbuf);
109 		*outbuf = NULL;
110 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
111 	}
112 
113 	return NULL;
114 }
115 
116 void
117 got_object_close(struct got_object *obj)
118 {
119 	if (obj->refcnt > 0) {
120 		obj->refcnt--;
121 		if (obj->refcnt > 0)
122 			return;
123 	}
124 
125 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
126 		struct got_delta *delta;
127 		while (!STAILQ_EMPTY(&obj->deltas.entries)) {
128 			delta = STAILQ_FIRST(&obj->deltas.entries);
129 			STAILQ_REMOVE_HEAD(&obj->deltas.entries, entry);
130 			free(delta);
131 		}
132 	}
133 	free(obj);
134 }
135 
136 const struct got_error *
137 got_object_raw_close(struct got_raw_object *obj)
138 {
139 	const struct got_error *err = NULL;
140 
141 	if (obj->refcnt > 0) {
142 		obj->refcnt--;
143 		if (obj->refcnt > 0)
144 			return NULL;
145 	}
146 
147 	if (obj->f != NULL && fclose(obj->f) == EOF && err == NULL)
148 		err = got_error_from_errno("fclose");
149 	free(obj->data);
150 	free(obj);
151 	return err;
152 }
153 
154 void
155 got_object_qid_free(struct got_object_qid *qid)
156 {
157 	free(qid->id);
158 	free(qid);
159 }
160 
161 void
162 got_object_id_queue_free(struct got_object_id_queue *ids)
163 {
164 	struct got_object_qid *qid;
165 
166 	while (!STAILQ_EMPTY(ids)) {
167 		qid = STAILQ_FIRST(ids);
168 		STAILQ_REMOVE_HEAD(ids, entry);
169 		got_object_qid_free(qid);
170 	}
171 }
172 
173 const struct got_error *
174 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
175 {
176 	const char *obj_labels[] = {
177 		GOT_OBJ_LABEL_COMMIT,
178 		GOT_OBJ_LABEL_TREE,
179 		GOT_OBJ_LABEL_BLOB,
180 		GOT_OBJ_LABEL_TAG,
181 	};
182 	const int obj_types[] = {
183 		GOT_OBJ_TYPE_COMMIT,
184 		GOT_OBJ_TYPE_TREE,
185 		GOT_OBJ_TYPE_BLOB,
186 		GOT_OBJ_TYPE_TAG,
187 	};
188 	int type = 0;
189 	size_t size = 0, hdrlen = 0;
190 	size_t i;
191 
192 	*obj = NULL;
193 
194 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
195 	if (hdrlen > len)
196 		return got_error(GOT_ERR_BAD_OBJ_HDR);
197 
198 	for (i = 0; i < nitems(obj_labels); i++) {
199 		const char *label = obj_labels[i];
200 		size_t label_len = strlen(label);
201 		const char *errstr;
202 
203 		if (strncmp(buf, label, label_len) != 0)
204 			continue;
205 
206 		type = obj_types[i];
207 		if (len <= label_len)
208 			return got_error(GOT_ERR_BAD_OBJ_HDR);
209 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
210 		if (errstr != NULL)
211 			return got_error(GOT_ERR_BAD_OBJ_HDR);
212 		break;
213 	}
214 
215 	if (type == 0)
216 		return got_error(GOT_ERR_BAD_OBJ_HDR);
217 
218 	*obj = calloc(1, sizeof(**obj));
219 	if (*obj == NULL)
220 		return got_error_from_errno("calloc");
221 	(*obj)->type = type;
222 	(*obj)->hdrlen = hdrlen;
223 	(*obj)->size = size;
224 	return NULL;
225 }
226 
227 const struct got_error *
228 got_object_read_header(struct got_object **obj, int fd)
229 {
230 	const struct got_error *err;
231 	struct got_inflate_buf zb;
232 	uint8_t *buf;
233 	const size_t zbsize = 64;
234 	size_t outlen, totlen;
235 	int nbuf = 1;
236 
237 	*obj = NULL;
238 
239 	buf = malloc(zbsize);
240 	if (buf == NULL)
241 		return got_error_from_errno("malloc");
242 
243 	err = got_inflate_init(&zb, buf, zbsize, NULL);
244 	if (err)
245 		return err;
246 
247 	totlen = 0;
248 	do {
249 		err = got_inflate_read_fd(&zb, fd, &outlen, NULL);
250 		if (err)
251 			goto done;
252 		if (outlen == 0)
253 			break;
254 		totlen += outlen;
255 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
256 			uint8_t *newbuf;
257 			nbuf++;
258 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
259 			if (newbuf == NULL) {
260 				err = got_error_from_errno("recallocarray");
261 				goto done;
262 			}
263 			buf = newbuf;
264 			zb.outbuf = newbuf + totlen;
265 			zb.outlen = (nbuf * zbsize) - totlen;
266 		}
267 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
268 
269 	err = got_object_parse_header(obj, buf, totlen);
270 done:
271 	free(buf);
272 	got_inflate_end(&zb);
273 	return err;
274 }
275 
276 struct got_commit_object *
277 got_object_commit_alloc_partial(void)
278 {
279 	struct got_commit_object *commit;
280 
281 	commit = calloc(1, sizeof(*commit));
282 	if (commit == NULL)
283 		return NULL;
284 	commit->tree_id = malloc(sizeof(*commit->tree_id));
285 	if (commit->tree_id == NULL) {
286 		free(commit);
287 		return NULL;
288 	}
289 
290 	STAILQ_INIT(&commit->parent_ids);
291 
292 	return commit;
293 }
294 
295 const struct got_error *
296 got_object_commit_add_parent(struct got_commit_object *commit,
297     const char *id_str)
298 {
299 	const struct got_error *err = NULL;
300 	struct got_object_qid *qid;
301 
302 	err = got_object_qid_alloc_partial(&qid);
303 	if (err)
304 		return err;
305 
306 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
307 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
308 		got_object_qid_free(qid);
309 		return err;
310 	}
311 
312 	STAILQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
313 	commit->nparents++;
314 
315 	return NULL;
316 }
317 
318 static const struct got_error *
319 parse_gmtoff(time_t *gmtoff, const char *tzstr)
320 {
321 	int sign = 1;
322 	const char *p = tzstr;
323 	time_t h, m;
324 
325 	*gmtoff = 0;
326 
327 	if (*p == '-')
328 		sign = -1;
329 	else if (*p != '+')
330 		return got_error(GOT_ERR_BAD_OBJ_DATA);
331 	p++;
332 	if (!isdigit(*p) && !isdigit(*(p + 1)))
333 		return got_error(GOT_ERR_BAD_OBJ_DATA);
334 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
335 
336 	p += 2;
337 	if (!isdigit(*p) && !isdigit(*(p + 1)))
338 		return got_error(GOT_ERR_BAD_OBJ_DATA);
339 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
340 
341 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
342 	return NULL;
343 }
344 
345 static const struct got_error *
346 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
347 {
348 	const struct got_error *err = NULL;
349 	const char *errstr;
350 	char *space, *tzstr;
351 
352 	/* Parse and strip off trailing timezone indicator string. */
353 	space = strrchr(committer, ' ');
354 	if (space == NULL)
355 		return got_error(GOT_ERR_BAD_OBJ_DATA);
356 	tzstr = strdup(space + 1);
357 	if (tzstr == NULL)
358 		return got_error_from_errno("strdup");
359 	err = parse_gmtoff(gmtoff, tzstr);
360 	free(tzstr);
361 	if (err) { 
362 		if (err->code != GOT_ERR_BAD_OBJ_DATA)
363 			return err;
364 		/* Old versions of Git omitted the timestamp. */
365 		*time = 0;
366 		*gmtoff = 0;
367 		return NULL;
368 	}
369 	*space = '\0';
370 
371 	/* Timestamp is separated from committer name + email by space. */
372 	space = strrchr(committer, ' ');
373 	if (space == NULL)
374 		return got_error(GOT_ERR_BAD_OBJ_DATA);
375 
376 	/* Timestamp parsed here is expressed as UNIX timestamp (UTC). */
377 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
378 	if (errstr)
379 		return got_error(GOT_ERR_BAD_OBJ_DATA);
380 
381 	/* Strip off parsed time information, leaving just author and email. */
382 	*space = '\0';
383 
384 	return NULL;
385 }
386 
387 void
388 got_object_commit_close(struct got_commit_object *commit)
389 {
390 	if (commit->refcnt > 0) {
391 		commit->refcnt--;
392 		if (commit->refcnt > 0)
393 			return;
394 	}
395 
396 	got_object_id_queue_free(&commit->parent_ids);
397 	free(commit->tree_id);
398 	free(commit->author);
399 	free(commit->committer);
400 	free(commit->logmsg);
401 	free(commit);
402 }
403 
404 struct got_object_id *
405 got_object_commit_get_tree_id(struct got_commit_object *commit)
406 {
407 	return commit->tree_id;
408 }
409 
410 int
411 got_object_commit_get_nparents(struct got_commit_object *commit)
412 {
413 	return commit->nparents;
414 }
415 
416 const struct got_object_id_queue *
417 got_object_commit_get_parent_ids(struct got_commit_object *commit)
418 {
419 	return &commit->parent_ids;
420 }
421 
422 const char *
423 got_object_commit_get_author(struct got_commit_object *commit)
424 {
425 	return commit->author;
426 }
427 
428 time_t
429 got_object_commit_get_author_time(struct got_commit_object *commit)
430 {
431 	return commit->author_time;
432 }
433 
434 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
435 {
436 	return commit->author_gmtoff;
437 }
438 
439 const char *
440 got_object_commit_get_committer(struct got_commit_object *commit)
441 {
442 	return commit->committer;
443 }
444 
445 time_t
446 got_object_commit_get_committer_time(struct got_commit_object *commit)
447 {
448 	return commit->committer_time;
449 }
450 
451 time_t
452 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
453 {
454 	return commit->committer_gmtoff;
455 }
456 
457 const struct got_error *
458 got_object_commit_get_logmsg(char **logmsg, struct got_commit_object *commit)
459 {
460 	const struct got_error *err = NULL;
461 	const char *src;
462 	char *dst;
463 	size_t len;
464 
465 	len = strlen(commit->logmsg);
466 	*logmsg = malloc(len + 2); /* leave room for a trailing \n and \0 */
467 	if (*logmsg == NULL)
468 		return got_error_from_errno("malloc");
469 
470 	/*
471 	 * Strip out unusual headers. Headers are separated from the commit
472 	 * message body by a single empty line.
473 	 */
474 	src = commit->logmsg;
475 	dst = *logmsg;
476 	while (*src != '\0' && *src != '\n') {
477 		int copy_header = 1, eol = 0;
478 		if (strncmp(src, GOT_COMMIT_LABEL_TREE,
479 		    strlen(GOT_COMMIT_LABEL_TREE)) != 0 &&
480 		    strncmp(src, GOT_COMMIT_LABEL_AUTHOR,
481 		    strlen(GOT_COMMIT_LABEL_AUTHOR)) != 0 &&
482 		    strncmp(src, GOT_COMMIT_LABEL_PARENT,
483 		    strlen(GOT_COMMIT_LABEL_PARENT)) != 0 &&
484 		    strncmp(src, GOT_COMMIT_LABEL_COMMITTER,
485 		    strlen(GOT_COMMIT_LABEL_COMMITTER)) != 0)
486 			copy_header = 0;
487 
488 		while (*src != '\0' && !eol) {
489 			if (copy_header) {
490 				*dst = *src;
491 				dst++;
492 			}
493 			if (*src == '\n')
494 				eol = 1;
495 			src++;
496 		}
497 	}
498 	*dst = '\0';
499 
500 	if (strlcat(*logmsg, src, len + 1) >= len + 1) {
501 		err = got_error(GOT_ERR_NO_SPACE);
502 		goto done;
503 	}
504 
505 	/* Trim redundant trailing whitespace. */
506 	len = strlen(*logmsg);
507 	while (len > 1 && isspace((unsigned char)(*logmsg)[len - 2]) &&
508 	    isspace((unsigned char)(*logmsg)[len - 1])) {
509 		(*logmsg)[len - 1] = '\0';
510 		len--;
511 	}
512 
513 	/* Append a trailing newline if missing. */
514 	if (len > 0 && (*logmsg)[len - 1] != '\n') {
515 		(*logmsg)[len] = '\n';
516 		(*logmsg)[len + 1] = '\0';
517 	}
518 done:
519 	if (err) {
520 		free(*logmsg);
521 		*logmsg = NULL;
522 	}
523 	return err;
524 }
525 
526 const char *
527 got_object_commit_get_logmsg_raw(struct got_commit_object *commit)
528 {
529 	return commit->logmsg;
530 }
531 
532 const struct got_error *
533 got_object_parse_commit(struct got_commit_object **commit, char *buf,
534     size_t len)
535 {
536 	const struct got_error *err = NULL;
537 	char *s = buf;
538 	size_t label_len;
539 	ssize_t remain = (ssize_t)len;
540 
541 	if (remain == 0)
542 		return got_error(GOT_ERR_BAD_OBJ_DATA);
543 
544 	*commit = got_object_commit_alloc_partial();
545 	if (*commit == NULL)
546 		return got_error_from_errno("got_object_commit_alloc_partial");
547 
548 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
549 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
550 		remain -= label_len;
551 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
552 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
553 			goto done;
554 		}
555 		s += label_len;
556 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
557 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
558 			goto done;
559 		}
560 		remain -= SHA1_DIGEST_STRING_LENGTH;
561 		s += SHA1_DIGEST_STRING_LENGTH;
562 	} else {
563 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
564 		goto done;
565 	}
566 
567 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
568 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
569 		remain -= label_len;
570 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
571 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
572 			goto done;
573 		}
574 		s += label_len;
575 		err = got_object_commit_add_parent(*commit, s);
576 		if (err)
577 			goto done;
578 
579 		remain -= SHA1_DIGEST_STRING_LENGTH;
580 		s += SHA1_DIGEST_STRING_LENGTH;
581 	}
582 
583 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
584 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
585 		char *p;
586 		size_t slen;
587 
588 		remain -= label_len;
589 		if (remain <= 0) {
590 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
591 			goto done;
592 		}
593 		s += label_len;
594 		p = memchr(s, '\n', remain);
595 		if (p == NULL) {
596 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
597 			goto done;
598 		}
599 		*p = '\0';
600 		slen = strlen(s);
601 		err = parse_commit_time(&(*commit)->author_time,
602 		    &(*commit)->author_gmtoff, s);
603 		if (err)
604 			goto done;
605 		(*commit)->author = strdup(s);
606 		if ((*commit)->author == NULL) {
607 			err = got_error_from_errno("strdup");
608 			goto done;
609 		}
610 		s += slen + 1;
611 		remain -= slen + 1;
612 	}
613 
614 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
615 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
616 		char *p;
617 		size_t slen;
618 
619 		remain -= label_len;
620 		if (remain <= 0) {
621 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
622 			goto done;
623 		}
624 		s += label_len;
625 		p = memchr(s, '\n', remain);
626 		if (p == NULL) {
627 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
628 			goto done;
629 		}
630 		*p = '\0';
631 		slen = strlen(s);
632 		err = parse_commit_time(&(*commit)->committer_time,
633 		    &(*commit)->committer_gmtoff, s);
634 		if (err)
635 			goto done;
636 		(*commit)->committer = strdup(s);
637 		if ((*commit)->committer == NULL) {
638 			err = got_error_from_errno("strdup");
639 			goto done;
640 		}
641 		s += slen + 1;
642 		remain -= slen + 1;
643 	}
644 
645 	(*commit)->logmsg = strndup(s, remain);
646 	if ((*commit)->logmsg == NULL) {
647 		err = got_error_from_errno("strndup");
648 		goto done;
649 	}
650 done:
651 	if (err) {
652 		got_object_commit_close(*commit);
653 		*commit = NULL;
654 	}
655 	return err;
656 }
657 
658 void
659 got_object_tree_close(struct got_tree_object *tree)
660 {
661 	if (tree->refcnt > 0) {
662 		tree->refcnt--;
663 		if (tree->refcnt > 0)
664 			return;
665 	}
666 
667 	free(tree->entries);
668 	free(tree);
669 }
670 
671 static const struct got_error *
672 parse_tree_entry(struct got_parsed_tree_entry **pte, const char **name,
673     size_t *elen, char *buf,
674     size_t maxlen)
675 {
676 	char *p, *space;
677 	const struct got_error *err = NULL;
678 
679 	*name = NULL;
680 	*elen = 0;
681 
682 	*pte = malloc(sizeof(**pte));
683 	if (*pte == NULL)
684 		return got_error_from_errno("malloc");
685 
686 	*elen = strnlen(buf, maxlen) + 1;
687 	if (*elen > maxlen) {
688 		free(*pte);
689 		*pte = NULL;
690 		return got_error(GOT_ERR_BAD_OBJ_DATA);
691 	}
692 
693 	space = memchr(buf, ' ', *elen);
694 	if (space == NULL || space <= buf) {
695 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
696 		free(*pte);
697 		*pte = NULL;
698 		return err;
699 	}
700 	(*pte)->mode = 0;
701 	p = buf;
702 	while (p < space) {
703 		if (*p < '0' && *p > '7') {
704 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
705 			goto done;
706 		}
707 		(*pte)->mode <<= 3;
708 		(*pte)->mode |= *p - '0';
709 		p++;
710 	}
711 
712 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
713 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
714 		goto done;
715 	}
716 	*name = space + 1;
717 	buf += *elen;
718 	(*pte)->id = buf;
719 	*elen += SHA1_DIGEST_LENGTH;
720 done:
721 	if (err) {
722 		free(*pte);
723 		*pte = NULL;
724 	}
725 	return err;
726 }
727 
728 const struct got_error *
729 got_object_parse_tree(struct got_pathlist_head *entries, int *nentries,
730     uint8_t *buf, size_t len)
731 {
732 	const struct got_error *err = NULL;
733 	size_t remain = len;
734 
735 	*nentries = 0;
736 	if (remain == 0)
737 		return NULL; /* tree is empty */
738 
739 	while (remain > 0) {
740 		struct got_parsed_tree_entry *pte;
741 		struct got_pathlist_entry *new = NULL;
742 		const char *name;
743 		size_t elen;
744 
745 		err = parse_tree_entry(&pte, &name, &elen, buf, remain);
746 		if (err)
747 			goto done;
748 		err = got_pathlist_insert(&new, entries, name, pte);
749 		if (err)
750 			goto done;
751 		if (new == NULL) {
752 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
753 			goto done;
754 		}
755 		buf += elen;
756 		remain -= elen;
757 		(*nentries)++;
758 	}
759 
760 	if (remain != 0) {
761 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
762 		goto done;
763 	}
764 done:
765 	if (err) {
766 		got_object_parsed_tree_entries_free(entries);
767 		*nentries = 0;
768 	}
769 	return err;
770 }
771 
772 void
773 got_object_parsed_tree_entries_free(struct got_pathlist_head *entries)
774 {
775 	struct got_pathlist_entry *pe;
776 
777 	TAILQ_FOREACH(pe, entries, entry) {
778 		struct got_parsed_tree_entry *pte = pe->data;
779 		free(pte);
780 	}
781 	got_pathlist_free(entries);
782 }
783 
784 void
785 got_object_tag_close(struct got_tag_object *tag)
786 {
787 	if (tag->refcnt > 0) {
788 		tag->refcnt--;
789 		if (tag->refcnt > 0)
790 			return;
791 	}
792 
793 	free(tag->tag);
794 	free(tag->tagger);
795 	free(tag->tagmsg);
796 	free(tag);
797 }
798 
799 const struct got_error *
800 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
801 {
802 	const struct got_error *err = NULL;
803 	size_t remain = len;
804 	char *s = buf;
805 	size_t label_len;
806 
807 	if (remain == 0)
808 		return got_error(GOT_ERR_BAD_OBJ_DATA);
809 
810 	*tag = calloc(1, sizeof(**tag));
811 	if (*tag == NULL)
812 		return got_error_from_errno("calloc");
813 
814 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
815 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
816 		remain -= label_len;
817 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
818 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
819 			goto done;
820 		}
821 		s += label_len;
822 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
823 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
824 			goto done;
825 		}
826 		remain -= SHA1_DIGEST_STRING_LENGTH;
827 		s += SHA1_DIGEST_STRING_LENGTH;
828 	} else {
829 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
830 		goto done;
831 	}
832 
833 	if (remain <= 0) {
834 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
835 		goto done;
836 	}
837 
838 	label_len = strlen(GOT_TAG_LABEL_TYPE);
839 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
840 		remain -= label_len;
841 		if (remain <= 0) {
842 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
843 			goto done;
844 		}
845 		s += label_len;
846 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
847 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
848 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
849 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
850 			s += label_len;
851 			remain -= label_len;
852 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
853 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
854 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
855 			label_len = strlen(GOT_OBJ_LABEL_TREE);
856 			s += label_len;
857 			remain -= label_len;
858 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
859 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
860 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
861 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
862 			s += label_len;
863 			remain -= label_len;
864 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
865 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
866 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
867 			label_len = strlen(GOT_OBJ_LABEL_TAG);
868 			s += label_len;
869 			remain -= label_len;
870 		} else {
871 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
872 			goto done;
873 		}
874 
875 		if (remain <= 0 || *s != '\n') {
876 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
877 			goto done;
878 		}
879 		s++;
880 		remain--;
881 		if (remain <= 0) {
882 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
883 			goto done;
884 		}
885 	} else {
886 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
887 		goto done;
888 	}
889 
890 	label_len = strlen(GOT_TAG_LABEL_TAG);
891 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
892 		char *p;
893 		size_t slen;
894 		remain -= label_len;
895 		if (remain <= 0) {
896 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
897 			goto done;
898 		}
899 		s += label_len;
900 		p = memchr(s, '\n', remain);
901 		if (p == NULL) {
902 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
903 			goto done;
904 		}
905 		*p = '\0';
906 		slen = strlen(s);
907 		(*tag)->tag = strndup(s, slen);
908 		if ((*tag)->tag == NULL) {
909 			err = got_error_from_errno("strndup");
910 			goto done;
911 		}
912 		s += slen + 1;
913 		remain -= slen + 1;
914 		if (remain <= 0) {
915 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
916 			goto done;
917 		}
918 	} else {
919 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
920 		goto done;
921 	}
922 
923 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
924 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
925 		char *p;
926 		size_t slen;
927 
928 		remain -= label_len;
929 		if (remain <= 0) {
930 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
931 			goto done;
932 		}
933 		s += label_len;
934 		p = memchr(s, '\n', remain);
935 		if (p == NULL) {
936 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
937 			goto done;
938 		}
939 		*p = '\0';
940 		slen = strlen(s);
941 		err = parse_commit_time(&(*tag)->tagger_time,
942 		    &(*tag)->tagger_gmtoff, s);
943 		if (err)
944 			goto done;
945 		(*tag)->tagger = strdup(s);
946 		if ((*tag)->tagger == NULL) {
947 			err = got_error_from_errno("strdup");
948 			goto done;
949 		}
950 		s += slen + 1;
951 		remain -= slen + 1;
952 		if (remain < 0) {
953 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
954 			goto done;
955 		}
956 	} else {
957 		/* Some old tags in the Linux git repo have no tagger. */
958 		(*tag)->tagger = strdup("");
959 		if ((*tag)->tagger == NULL) {
960 			err = got_error_from_errno("strdup");
961 			goto done;
962 		}
963 	}
964 
965 	(*tag)->tagmsg = strndup(s, remain);
966 	if ((*tag)->tagmsg == NULL) {
967 		err = got_error_from_errno("strndup");
968 		goto done;
969 	}
970 done:
971 	if (err) {
972 		got_object_tag_close(*tag);
973 		*tag = NULL;
974 	}
975 	return err;
976 }
977 
978 const struct got_error *
979 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
980 {
981 	const struct got_error *err = NULL;
982 	static const size_t blocksize = 512;
983 	size_t n, total, remain;
984 	uint8_t *buf;
985 
986 	*outbuf = NULL;
987 	*outlen = 0;
988 
989 	buf = malloc(blocksize);
990 	if (buf == NULL)
991 		return got_error_from_errno("malloc");
992 
993 	remain = blocksize;
994 	total = 0;
995 	for (;;) {
996 		if (remain == 0) {
997 			uint8_t *newbuf;
998 			newbuf = reallocarray(buf, 1, total + blocksize);
999 			if (newbuf == NULL) {
1000 				err = got_error_from_errno("reallocarray");
1001 				goto done;
1002 			}
1003 			buf = newbuf;
1004 			remain += blocksize;
1005 		}
1006 		n = fread(buf + total, 1, remain, f);
1007 		if (n == 0) {
1008 			if (ferror(f)) {
1009 				err = got_ferror(f, GOT_ERR_IO);
1010 				goto done;
1011 			}
1012 			break; /* EOF */
1013 		}
1014 		remain -= n;
1015 		total += n;
1016 	};
1017 
1018 done:
1019 	if (err == NULL) {
1020 		*outbuf = buf;
1021 		*outlen = total;
1022 	} else
1023 		free(buf);
1024 	return err;
1025 }