Got Mirror

Blob

Date:: Mon Apr 23 05:20:32 2018 UTC
Message:: simplify variable names in read_object_header_privsep_child()
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018 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/uio.h>
21 #include <sys/socket.h>
22 #include <sys/wait.h>
23 
24 #include <errno.h>
25 #include <fcntl.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 
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_repository.h"
39 
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_pack.h"
43 #include "got_lib_path.h"
44 #include "got_lib_zbuf.h"
45 #include "got_lib_object.h"
46 #include "got_lib_privsep.h"
47 
48 #ifndef MIN
49 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
50 #endif
51 
52 #ifndef nitems
53 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
54 #endif
55 
56 #define GOT_OBJ_TAG_COMMIT	"commit"
57 #define GOT_OBJ_TAG_TREE	"tree"
58 #define GOT_OBJ_TAG_BLOB	"blob"
59 
60 #define GOT_COMMIT_TAG_TREE		"tree "
61 #define GOT_COMMIT_TAG_PARENT		"parent "
62 #define GOT_COMMIT_TAG_AUTHOR		"author "
63 #define GOT_COMMIT_TAG_COMMITTER	"committer "
64 
65 const struct got_error *
66 got_object_id_str(char **outbuf, struct got_object_id *id)
67 {
68 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
69 
70 	*outbuf = calloc(1, len);
71 	if (*outbuf == NULL)
72 		return got_error_from_errno();
73 
74 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
75 		free(*outbuf);
76 		*outbuf = NULL;
77 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
78 	}
79 
80 	return NULL;
81 }
82 
83 int
84 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
85 {
86 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
87 }
88 
89 struct got_object_id *
90 got_object_id_dup(struct got_object_id *id1)
91 {
92 	struct got_object_id *id2;
93 
94 	id2 = malloc(sizeof(*id2));
95 	if (id2 == NULL)
96 		return NULL;
97 	memcpy(id2, id1, sizeof(*id2));
98 	return id2;
99 }
100 
101 struct got_object_id *
102 got_object_get_id(struct got_object *obj)
103 {
104 	return got_object_id_dup(&obj->id);
105 }
106 
107 int
108 got_object_get_type(struct got_object *obj)
109 {
110 	switch (obj->type) {
111 	case GOT_OBJ_TYPE_COMMIT:
112 	case GOT_OBJ_TYPE_TREE:
113 	case GOT_OBJ_TYPE_BLOB:
114 	case GOT_OBJ_TYPE_TAG:
115 		return obj->type;
116 	default:
117 		abort();
118 		break;
119 	}
120 
121 	/* not reached */
122 	return 0;
123 }
124 
125 static const struct got_error *
126 parse_object_header(struct got_object **obj, char *buf, size_t len)
127 {
128 	const char *obj_tags[] = {
129 		GOT_OBJ_TAG_COMMIT,
130 		GOT_OBJ_TAG_TREE,
131 		GOT_OBJ_TAG_BLOB
132 	};
133 	const int obj_types[] = {
134 		GOT_OBJ_TYPE_COMMIT,
135 		GOT_OBJ_TYPE_TREE,
136 		GOT_OBJ_TYPE_BLOB,
137 	};
138 	int type = 0;
139 	size_t size = 0, hdrlen = 0;
140 	int i;
141 	char *p = strchr(buf, '\0');
142 
143 	if (p == NULL)
144 		return got_error(GOT_ERR_BAD_OBJ_HDR);
145 
146 	hdrlen = strlen(buf) + 1 /* '\0' */;
147 
148 	for (i = 0; i < nitems(obj_tags); i++) {
149 		const char *tag = obj_tags[i];
150 		size_t tlen = strlen(tag);
151 		const char *errstr;
152 
153 		if (strncmp(buf, tag, tlen) != 0)
154 			continue;
155 
156 		type = obj_types[i];
157 		if (len <= tlen)
158 			return got_error(GOT_ERR_BAD_OBJ_HDR);
159 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
160 		if (errstr != NULL)
161 			return got_error(GOT_ERR_BAD_OBJ_HDR);
162 		break;
163 	}
164 
165 	if (type == 0)
166 		return got_error(GOT_ERR_BAD_OBJ_HDR);
167 
168 	*obj = calloc(1, sizeof(**obj));
169 	if (*obj == NULL)
170 		return got_error_from_errno();
171 	(*obj)->type = type;
172 	(*obj)->hdrlen = hdrlen;
173 	(*obj)->size = size;
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 read_object_header(struct got_object **obj, FILE *f)
179 {
180 	const struct got_error *err;
181 	struct got_zstream_buf zb;
182 	char *buf;
183 	const size_t zbsize = 64;
184 	size_t outlen, totlen;
185 	int i;
186 
187 	buf = calloc(zbsize, sizeof(char));
188 	if (buf == NULL)
189 		return got_error_from_errno();
190 
191 	err = got_inflate_init(&zb, NULL, zbsize);
192 	if (err)
193 		return err;
194 
195 	i = 0;
196 	totlen = 0;
197 	do {
198 		err = got_inflate_read(&zb, f, &outlen);
199 		if (err)
200 			goto done;
201 		if (strchr(zb.outbuf, '\0') == NULL) {
202 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
203 			if (buf == NULL) {
204 				err = got_error_from_errno();
205 				goto done;
206 			}
207 		}
208 		memcpy(buf + totlen, zb.outbuf, outlen);
209 		totlen += outlen;
210 		i++;
211 	} while (strchr(zb.outbuf, '\0') == NULL);
212 
213 	err = parse_object_header(obj, buf, totlen);
214 done:
215 	got_inflate_end(&zb);
216 	return err;
217 }
218 
219 static void
220 read_object_header_privsep_child(int obj_fd, int imsg_fds[2])
221 {
222 	const struct got_error *err = NULL;
223 	struct got_object *obj = NULL;
224 	struct imsgbuf ibuf;
225 	FILE *f = NULL;
226 	int status = 0;
227 
228 	setproctitle("got: read object header");
229 	close(imsg_fds[0]);
230 	imsg_init(&ibuf, imsg_fds[1]);
231 
232 	/* revoke access to most system calls */
233 	if (pledge("stdio", NULL) == -1) {
234 		err = got_error_from_errno();
235 		goto done;
236 	}
237 
238 	f = fdopen(obj_fd, "rb");
239 	if (f == NULL) {
240 		err = got_error_from_errno();
241 		close(obj_fd);
242 		goto done;
243 	}
244 
245 	err = read_object_header(&obj, f);
246 	if (err)
247 		goto done;
248 
249 	err = got_privsep_send_obj(&ibuf, obj, 0);
250 done:
251 	if (obj)
252 		got_object_close(obj);
253 	if (err) {
254 		got_privsep_send_error(&ibuf, err);
255 		status = 1;
256 	}
257 	if (f)
258 		fclose(f);
259 	imsg_clear(&ibuf);
260 	close(imsg_fds[1]);
261 	_exit(status);
262 }
263 
264 static const struct got_error *
265 read_object_header_privsep(struct got_object **obj, int fd)
266 {
267 	struct imsgbuf parent_ibuf;
268 	int imsg_fds[2];
269 	const struct got_error *err = NULL;
270 	pid_t pid;
271 	int child_status;
272 
273 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1)
274 		return got_error_from_errno();
275 
276 	pid = fork();
277 	if (pid == -1)
278 		return got_error_from_errno();
279 	else if (pid == 0) {
280 		read_object_header_privsep_child(fd, imsg_fds);
281 		/* not reached */
282 	}
283 
284 	close(imsg_fds[1]);
285 	imsg_init(&parent_ibuf, imsg_fds[0]);
286 	err = got_privsep_recv_obj(obj, &parent_ibuf);
287 	imsg_clear(&parent_ibuf);
288 	waitpid(pid, &child_status, 0);
289 	close(imsg_fds[0]);
290 	return err;
291 }
292 
293 static const struct got_error *
294 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
295 {
296 	const struct got_error *err = NULL;
297 	char *hex;
298 	char *path_objects = got_repo_get_path_objects(repo);
299 
300 	*path = NULL;
301 
302 	if (path_objects == NULL)
303 		return got_error_from_errno();
304 
305 	err = got_object_id_str(&hex, id);
306 	if (err)
307 		return err;
308 
309 	if (asprintf(path, "%s/%.2x/%s", path_objects,
310 	    id->sha1[0], hex + 2) == -1)
311 		err = got_error_from_errno();
312 
313 	free(hex);
314 	free(path_objects);
315 	return err;
316 }
317 
318 static const struct got_error *
319 open_loose_object(int *fd, struct got_object *obj, struct got_repository *repo)
320 {
321 	const struct got_error *err = NULL;
322 	char *path;
323 
324 	err = object_path(&path, &obj->id, repo);
325 	if (err)
326 		return err;
327 	*fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
328 	if (*fd == -1) {
329 		err = got_error_from_errno();
330 		goto done;
331 	}
332 done:
333 	free(path);
334 	return err;
335 }
336 
337 const struct got_error *
338 got_object_open(struct got_object **obj, struct got_repository *repo,
339     struct got_object_id *id)
340 {
341 	const struct got_error *err = NULL;
342 	char *path;
343 	int fd;
344 
345 	err = object_path(&path, id, repo);
346 	if (err)
347 		return err;
348 
349 	fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
350 	if (fd == -1) {
351 		if (errno != ENOENT) {
352 			err = got_error_from_errno();
353 			goto done;
354 		}
355 		err = got_packfile_open_object(obj, id, repo);
356 		if (err)
357 			goto done;
358 		if (*obj == NULL)
359 			err = got_error(GOT_ERR_NO_OBJ);
360 	} else {
361 		err = read_object_header_privsep(obj, fd);
362 		if (err)
363 			goto done;
364 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
365 	}
366 done:
367 	free(path);
368 	if (fd != -1)
369 		close(fd);
370 	return err;
371 
372 }
373 
374 const struct got_error *
375 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
376     const char *id_str)
377 {
378 	struct got_object_id id;
379 
380 	if (!got_parse_sha1_digest(id.sha1, id_str))
381 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
382 
383 	return got_object_open(obj, repo, &id);
384 }
385 
386 void
387 got_object_close(struct got_object *obj)
388 {
389 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
390 		struct got_delta *delta;
391 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
392 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
393 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
394 			got_delta_close(delta);
395 		}
396 	}
397 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
398 		free(obj->path_packfile);
399 	free(obj);
400 }
401 
402 static const struct got_error *
403 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
404 {
405 	const struct got_error *err = NULL;
406 	char *s = buf;
407 	size_t tlen;
408 	ssize_t remain = (ssize_t)len;
409  
410 	*commit = calloc(1, sizeof(**commit));
411 	if (*commit == NULL)
412 		return got_error_from_errno();
413 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
414 	if ((*commit)->tree_id == NULL) {
415 		err = got_error_from_errno();
416 		free(*commit);
417 		*commit = NULL;
418 		return err;
419 	}
420 
421 	SIMPLEQ_INIT(&(*commit)->parent_ids);
422 
423 	tlen = strlen(GOT_COMMIT_TAG_TREE);
424 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
425 		remain -= tlen;
426 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
427 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
428 			goto done;
429 		}
430 		s += tlen;
431 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
432 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
433 			goto done;
434 		}
435 		remain -= SHA1_DIGEST_STRING_LENGTH;
436 		s += SHA1_DIGEST_STRING_LENGTH;
437 	} else {
438 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
439 		goto done;
440 	}
441 
442 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
443 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
444 		struct got_parent_id *pid;
445 
446 		remain -= tlen;
447 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
448 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
449 			goto done;
450 		}
451 
452 		pid = calloc(1, sizeof(*pid));
453 		if (pid == NULL) {
454 			err = got_error_from_errno();
455 			goto done;
456 		}
457 		pid->id = calloc(1, sizeof(*pid->id));
458 		if (pid->id == NULL) {
459 			err = got_error_from_errno();
460 			free(pid);
461 			goto done;
462 		}
463 		s += tlen;
464 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
465 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
466 			free(pid->id);
467 			free(pid);
468 			goto done;
469 		}
470 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
471 		(*commit)->nparents++;
472 
473 		remain -= SHA1_DIGEST_STRING_LENGTH;
474 		s += SHA1_DIGEST_STRING_LENGTH;
475 	}
476 
477 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
478 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
479 		char *p;
480 
481 		remain -= tlen;
482 		if (remain <= 0) {
483 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
484 			goto done;
485 		}
486 		s += tlen;
487 		p = strchr(s, '\n');
488 		if (p == NULL) {
489 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
490 			goto done;
491 		}
492 		*p = '\0';
493 		(*commit)->author = strdup(s);
494 		if ((*commit)->author == NULL) {
495 			err = got_error_from_errno();
496 			goto done;
497 		}
498 		s += strlen((*commit)->author) + 1;
499 		remain -= strlen((*commit)->author) + 1;
500 	}
501 
502 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
503 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
504 		char *p;
505 
506 		remain -= tlen;
507 		if (remain <= 0) {
508 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
509 			goto done;
510 		}
511 		s += tlen;
512 		p = strchr(s, '\n');
513 		if (p == NULL) {
514 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
515 			goto done;
516 		}
517 		*p = '\0';
518 		(*commit)->committer = strdup(s);
519 		if ((*commit)->committer == NULL) {
520 			err = got_error_from_errno();
521 			goto done;
522 		}
523 		s += strlen((*commit)->committer) + 1;
524 		remain -= strlen((*commit)->committer) + 1;
525 	}
526 
527 	(*commit)->logmsg = strndup(s, remain);
528 	if ((*commit)->logmsg == NULL) {
529 		err = got_error_from_errno();
530 		goto done;
531 	}
532 done:
533 	if (err) {
534 		got_object_commit_close(*commit);
535 		*commit = NULL;
536 	}
537 	return err;
538 }
539 
540 static void
541 tree_entry_close(struct got_tree_entry *te)
542 {
543 	free(te->id);
544 	free(te->name);
545 	free(te);
546 }
547 
548 static const struct got_error *
549 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
550     size_t maxlen)
551 {
552 	char *p = buf, *space;
553 	const struct got_error *err = NULL;
554 
555 	*te = calloc(1, sizeof(**te));
556 	if (*te == NULL)
557 		return got_error_from_errno();
558 
559 	(*te)->id = calloc(1, sizeof(*(*te)->id));
560 	if ((*te)->id == NULL) {
561 		err = got_error_from_errno();
562 		free(*te);
563 		*te = NULL;
564 		return err;
565 	}
566 
567 	*elen = strlen(buf) + 1;
568 	if (*elen > maxlen) {
569 		free(*te);
570 		*te = NULL;
571 		return got_error(GOT_ERR_BAD_OBJ_DATA);
572 	}
573 
574 	space = strchr(buf, ' ');
575 	if (space == NULL) {
576 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
577 		free(*te);
578 		*te = NULL;
579 		return err;
580 	}
581 	while (*p != ' ') {
582 		if (*p < '0' && *p > '7') {
583 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
584 			goto done;
585 		}
586 		(*te)->mode <<= 3;
587 		(*te)->mode |= *p - '0';
588 		p++;
589 	}
590 
591 	(*te)->name = strdup(space + 1);
592 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
593 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
594 		goto done;
595 	}
596 	buf += strlen(buf) + 1;
597 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
598 	*elen += SHA1_DIGEST_LENGTH;
599 done:
600 	if (err) {
601 		tree_entry_close(*te);
602 		*te = NULL;
603 	}
604 	return err;
605 }
606 
607 static const struct got_error *
608 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
609     uint8_t *buf, size_t len)
610 {
611 	const struct got_error *err;
612 	size_t remain = len;
613 
614 	*tree = calloc(1, sizeof(**tree));
615 	if (*tree == NULL)
616 		return got_error_from_errno();
617 
618 	SIMPLEQ_INIT(&(*tree)->entries);
619 
620 	while (remain > 0) {
621 		struct got_tree_entry *te;
622 		size_t elen;
623 
624 		err = parse_tree_entry(&te, &elen, buf, remain);
625 		if (err)
626 			return err;
627 		(*tree)->nentries++;
628 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
629 		buf += elen;
630 		remain -= elen;
631 	}
632 
633 	if (remain != 0) {
634 		got_object_tree_close(*tree);
635 		return got_error(GOT_ERR_BAD_OBJ_DATA);
636 	}
637 
638 	return NULL;
639 }
640 
641 static const struct got_error *
642 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
643 {
644 	const struct got_error *err = NULL;
645 	static const size_t blocksize = 512;
646 	size_t n, total, remain;
647 	uint8_t *buf;
648 
649 	*outbuf = NULL;
650 	*outlen = 0;
651 
652 	buf = calloc(1, blocksize);
653 	if (buf == NULL)
654 		return got_error_from_errno();
655 
656 	remain = blocksize;
657 	total = 0;
658 	while (1) {
659 		if (remain == 0) {
660 			uint8_t *newbuf;
661 			newbuf = reallocarray(buf, 1, total + blocksize);
662 			if (newbuf == NULL) {
663 				err = got_error_from_errno();
664 				goto done;
665 			}
666 			buf = newbuf;
667 			remain += blocksize;
668 		}
669 		n = fread(buf + total, 1, remain, f);
670 		if (n == 0) {
671 			if (ferror(f)) {
672 				err = got_ferror(f, GOT_ERR_IO);
673 				goto done;
674 			}
675 			break; /* EOF */
676 		}
677 		remain -= n;
678 		total += n;
679 	};
680 
681 done:
682 	if (err == NULL) {
683 		*outbuf = buf;
684 		*outlen = total;
685 	} else
686 		free(buf);
687 	return err;
688 }
689 
690 static const struct got_error *
691 read_commit_object(struct got_commit_object **commit,
692     struct got_repository *repo, struct got_object *obj, FILE *f)
693 {
694 	const struct got_error *err = NULL;
695 	size_t len;
696 	uint8_t *p;
697 
698 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
699 		err = read_to_mem(&p, &len, f);
700 	else
701 		err = got_inflate_to_mem(&p, &len, f);
702 	if (err)
703 		return err;
704 
705 	if (len < obj->hdrlen + obj->size) {
706 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
707 		goto done;
708 	}
709 
710 	/* Skip object header. */
711 	len -= obj->hdrlen;
712 	err = parse_commit_object(commit, p + obj->hdrlen, len);
713 	free(p);
714 done:
715 	return err;
716 }
717 
718 const struct got_error *
719 got_object_commit_open(struct got_commit_object **commit,
720     struct got_repository *repo, struct got_object *obj)
721 {
722 	const struct got_error *err = NULL;
723 
724 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
725 		return got_error(GOT_ERR_OBJ_TYPE);
726 
727 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
728 		uint8_t *buf;
729 		size_t len;
730 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
731 		if (err)
732 			return err;
733 		obj->size = len;
734 		err = parse_commit_object(commit, buf, len);
735 		free(buf);
736 	} else {
737 		FILE *f;
738 		int fd;
739 		err = open_loose_object(&fd, obj, repo);
740 		if (err)
741 			return err;
742 		f = fdopen(fd, "rb");
743 		if (f == NULL) {
744 			err = got_error_from_errno();
745 			close(fd);
746 			return err;
747 		}
748 		err = read_commit_object(commit, repo, obj, f);
749 		fclose(f);
750 	}
751 	return err;
752 }
753 
754 void
755 got_object_commit_close(struct got_commit_object *commit)
756 {
757 	struct got_parent_id *pid;
758 
759 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
760 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
761 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
762 		free(pid->id);
763 		free(pid);
764 	}
765 
766 	free(commit->tree_id);
767 	free(commit->author);
768 	free(commit->committer);
769 	free(commit->logmsg);
770 	free(commit);
771 }
772 
773 static const struct got_error *
774 read_tree_object(struct got_tree_object **tree,
775     struct got_repository *repo, struct got_object *obj, FILE *f)
776 {
777 	const struct got_error *err = NULL;
778 	size_t len;
779 	uint8_t *p;
780 
781 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
782 		err = read_to_mem(&p, &len, f);
783 	else
784 		err = got_inflate_to_mem(&p, &len, f);
785 	if (err)
786 		return err;
787 
788 	if (len < obj->hdrlen + obj->size) {
789 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
790 		goto done;
791 	}
792 
793 	/* Skip object header. */
794 	len -= obj->hdrlen;
795 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
796 	free(p);
797 done:
798 	return err;
799 }
800 
801 const struct got_error *
802 got_object_tree_open(struct got_tree_object **tree,
803     struct got_repository *repo, struct got_object *obj)
804 {
805 	const struct got_error *err = NULL;
806 
807 	if (obj->type != GOT_OBJ_TYPE_TREE)
808 		return got_error(GOT_ERR_OBJ_TYPE);
809 
810 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
811 		uint8_t *buf;
812 		size_t len;
813 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
814 		if (err)
815 			return err;
816 		obj->size = len;
817 		err = parse_tree_object(tree, repo, buf, len);
818 		free(buf);
819 	} else {
820 		FILE *f;
821 		int fd;
822 		err = open_loose_object(&fd, obj, repo);
823 		if (err)
824 			return err;
825 		f = fdopen(fd, "rb");
826 		if (f == NULL) {
827 			close(fd);
828 			return got_error_from_errno();
829 		}
830 		err = read_tree_object(tree, repo, obj, f);
831 		fclose(f);
832 		close(fd);
833 	}
834 	return err;
835 }
836 
837 void
838 got_object_tree_close(struct got_tree_object *tree)
839 {
840 	struct got_tree_entry *te;
841 
842 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
843 		te = SIMPLEQ_FIRST(&tree->entries);
844 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
845 		tree_entry_close(te);
846 	}
847 
848 	free(tree);
849 }
850 
851 const struct got_error *
852 got_object_blob_open(struct got_blob_object **blob,
853     struct got_repository *repo, struct got_object *obj, size_t blocksize)
854 {
855 	const struct got_error *err = NULL;
856 
857 	if (obj->type != GOT_OBJ_TYPE_BLOB)
858 		return got_error(GOT_ERR_OBJ_TYPE);
859 
860 	if (blocksize < obj->hdrlen)
861 		return got_error(GOT_ERR_NO_SPACE);
862 
863 	*blob = calloc(1, sizeof(**blob));
864 	if (*blob == NULL)
865 		return got_error_from_errno();
866 
867 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
868 		(*blob)->read_buf = calloc(1, blocksize);
869 		if ((*blob)->read_buf == NULL) {
870 			err = got_error_from_errno();
871 			free(*blob);
872 			*blob = NULL;
873 			return err;
874 		}
875 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
876 		if (err) {
877 			free((*blob)->read_buf);
878 			free(*blob);
879 			*blob = NULL;
880 			return err;
881 		}
882 	} else {
883 		int fd;
884 		err = open_loose_object(&fd, obj, repo);
885 		if (err) {
886 			free(*blob);
887 			*blob = NULL;
888 			return err;
889 		}
890 		(*blob)->f = fdopen(fd, "rb");
891 		if ((*blob)->f == NULL) {
892 			free(*blob);
893 			*blob = NULL;
894 			close(fd);
895 			return err;
896 		}
897 
898 		err = got_inflate_init(&(*blob)->zb, NULL, blocksize);
899 		if (err != NULL) {
900 			fclose((*blob)->f);
901 			free(*blob);
902 			*blob = NULL;
903 			return err;
904 		}
905 
906 		(*blob)->read_buf = (*blob)->zb.outbuf;
907 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
908 	}
909 
910 	(*blob)->hdrlen = obj->hdrlen;
911 	(*blob)->blocksize = blocksize;
912 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
913 
914 	return err;
915 }
916 
917 void
918 got_object_blob_close(struct got_blob_object *blob)
919 {
920 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
921 		got_inflate_end(&blob->zb);
922 	else
923 		free(blob->read_buf);
924 	fclose(blob->f);
925 	free(blob);
926 }
927 
928 char *
929 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
930 {
931 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
932 }
933 
934 size_t
935 got_object_blob_get_hdrlen(struct got_blob_object *blob)
936 {
937 	return blob->hdrlen;
938 }
939 
940 const uint8_t *
941 got_object_blob_get_read_buf(struct got_blob_object *blob)
942 {
943 	return blob->read_buf;
944 }
945 
946 const struct got_error *
947 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
948 {
949 	size_t n;
950 
951 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
952 		return got_inflate_read(&blob->zb, blob->f, outlenp);
953 
954 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
955 	if (n == 0 && ferror(blob->f))
956 		return got_ferror(blob->f, GOT_ERR_IO);
957 	*outlenp = n;
958 	return NULL;
959 }