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Blob

Date:: Sat Mar 3 13:02:13 2018 UTC
Message:: In read_to_mem() loop, don't overwrite already read blocks
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/stat.h>
18 #include <sys/queue.h>
19 
20 #include <errno.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sha1.h>
25 #include <zlib.h>
26 #include <ctype.h>
27 #include <limits.h>
28 
29 #include "got_error.h"
30 #include "got_object.h"
31 #include "got_repository.h"
32 
33 #include "got_sha1_priv.h"
34 #include "got_delta_priv.h"
35 #include "got_pack_priv.h"
36 #include "got_zb_priv.h"
37 #include "got_object_priv.h"
38 
39 #ifndef MIN
40 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
41 #endif
42 
43 #ifndef nitems
44 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
45 #endif
46 
47 #define GOT_OBJ_TAG_COMMIT	"commit"
48 #define GOT_OBJ_TAG_TREE	"tree"
49 #define GOT_OBJ_TAG_BLOB	"blob"
50 
51 #define GOT_COMMIT_TAG_TREE		"tree "
52 #define GOT_COMMIT_TAG_PARENT		"parent "
53 #define GOT_COMMIT_TAG_AUTHOR		"author "
54 #define GOT_COMMIT_TAG_COMMITTER	"committer "
55 
56 const struct got_error *
57 got_object_id_str(char **outbuf, struct got_object_id *id)
58 {
59 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
60 
61 	*outbuf = calloc(1, len);
62 	if (*outbuf == NULL)
63 		return got_error(GOT_ERR_NO_MEM);
64 
65 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
66 		free(*outbuf);
67 		*outbuf = NULL;
68 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
69 	}
70 
71 	return NULL;
72 }
73 
74 int
75 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
76 {
77 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
78 }
79 
80 int
81 got_object_get_type(struct got_object *obj)
82 {
83 	switch (obj->type) {
84 	case GOT_OBJ_TYPE_COMMIT:
85 	case GOT_OBJ_TYPE_TREE:
86 	case GOT_OBJ_TYPE_BLOB:
87 	case GOT_OBJ_TYPE_TAG:
88 		return obj->type;
89 	default:
90 		abort();
91 		break;
92 	}
93 
94 	/* not reached */
95 	return 0;
96 }
97 
98 static const struct got_error *
99 parse_object_header(struct got_object **obj, char *buf, size_t len)
100 {
101 	const char *obj_tags[] = {
102 		GOT_OBJ_TAG_COMMIT,
103 		GOT_OBJ_TAG_TREE,
104 		GOT_OBJ_TAG_BLOB
105 	};
106 	const int obj_types[] = {
107 		GOT_OBJ_TYPE_COMMIT,
108 		GOT_OBJ_TYPE_TREE,
109 		GOT_OBJ_TYPE_BLOB,
110 	};
111 	int type = 0;
112 	size_t size = 0, hdrlen = 0;
113 	int i;
114 	char *p = strchr(buf, '\0');
115 
116 	if (p == NULL)
117 		return got_error(GOT_ERR_BAD_OBJ_HDR);
118 
119 	hdrlen = strlen(buf) + 1 /* '\0' */;
120 
121 	for (i = 0; i < nitems(obj_tags); i++) {
122 		const char *tag = obj_tags[i];
123 		size_t tlen = strlen(tag);
124 		const char *errstr;
125 
126 		if (strncmp(buf, tag, tlen) != 0)
127 			continue;
128 
129 		type = obj_types[i];
130 		if (len <= tlen)
131 			return got_error(GOT_ERR_BAD_OBJ_HDR);
132 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
133 		if (errstr != NULL)
134 			return got_error(GOT_ERR_BAD_OBJ_HDR);
135 		break;
136 	}
137 
138 	if (type == 0)
139 		return got_error(GOT_ERR_BAD_OBJ_HDR);
140 
141 	*obj = calloc(1, sizeof(**obj));
142 	if (*obj == NULL)
143 		return got_error(GOT_ERR_NO_MEM);
144 	(*obj)->type = type;
145 	(*obj)->hdrlen = hdrlen;
146 	(*obj)->size = size;
147 	return NULL;
148 }
149 
150 static const struct got_error *
151 read_object_header(struct got_object **obj, struct got_repository *repo,
152     FILE *f)
153 {
154 	const struct got_error *err;
155 	struct got_zstream_buf zb;
156 	char *buf;
157 	size_t len;
158 	const size_t zbsize = 64;
159 	size_t outlen, totlen;
160 	int i, ret;
161 
162 	buf = calloc(zbsize, sizeof(char));
163 	if (buf == NULL)
164 		return got_error(GOT_ERR_NO_MEM);
165 
166 	err = got_inflate_init(&zb, zbsize);
167 	if (err)
168 		return err;
169 
170 	i = 0;
171 	totlen = 0;
172 	do {
173 		err = got_inflate_read(&zb, f, &outlen);
174 		if (err)
175 			goto done;
176 		if (strchr(zb.outbuf, '\0') == NULL) {
177 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
178 			if (buf == NULL) {
179 				err = got_error(GOT_ERR_NO_MEM);
180 				goto done;
181 			}
182 		}
183 		memcpy(buf + totlen, zb.outbuf, outlen);
184 		totlen += outlen;
185 		i++;
186 	} while (strchr(zb.outbuf, '\0') == NULL);
187 
188 	err = parse_object_header(obj, buf, totlen);
189 done:
190 	got_inflate_end(&zb);
191 	return err;
192 }
193 
194 static const struct got_error *
195 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
196 {
197 	const struct got_error *err = NULL;
198 	char *hex;
199 	char *path_objects = got_repo_get_path_objects(repo);
200 
201 	if (path_objects == NULL)
202 		return got_error(GOT_ERR_NO_MEM);
203 
204 	err = got_object_id_str(&hex, id);
205 	if (err)
206 		return err;
207 
208 	if (asprintf(path, "%s/%.2x/%s", path_objects,
209 	    id->sha1[0], hex + 2) == -1)
210 		err = got_error(GOT_ERR_NO_MEM);
211 
212 	free(hex);
213 	free(path_objects);
214 	return err;
215 }
216 
217 static const struct got_error *
218 open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
219 {
220 	const struct got_error *err = NULL;
221 	char *path;
222 
223 	err = object_path(&path, &obj->id, repo);
224 	if (err)
225 		return err;
226 	*f = fopen(path, "rb");
227 	if (*f == NULL) {
228 		err = got_error_from_errno();
229 		goto done;
230 	}
231 done:
232 	free(path);
233 	return err;
234 }
235 
236 const struct got_error *
237 got_object_open(struct got_object **obj, struct got_repository *repo,
238     struct got_object_id *id)
239 {
240 	const struct got_error *err = NULL;
241 	char *path;
242 	FILE *f;
243 
244 	err = object_path(&path, id, repo);
245 	if (err)
246 		return err;
247 
248 	f = fopen(path, "rb");
249 	if (f == NULL) {
250 		if (errno != ENOENT) {
251 			err = got_error_from_errno();
252 			goto done;
253 		}
254 		err = got_packfile_open_object(obj, id, repo);
255 		if (err)
256 			goto done;
257 		if (*obj == NULL)
258 			err = got_error(GOT_ERR_NO_OBJ);
259 	} else {
260 		err = read_object_header(obj, repo, f);
261 		if (err)
262 			goto done;
263 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
264 	}
265 done:
266 	free(path);
267 	if (err && f)
268 		fclose(f);
269 	return err;
270 
271 }
272 
273 const struct got_error *
274 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
275     const char *id_str)
276 {
277 	struct got_object_id id;
278 
279 	if (!got_parse_sha1_digest(id.sha1, id_str))
280 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
281 
282 	return got_object_open(obj, repo, &id);
283 }
284 
285 void
286 got_object_close(struct got_object *obj)
287 {
288 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
289 		struct got_delta *delta;
290 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
291 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
292 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
293 			got_delta_close(delta);
294 		}
295 	}
296 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
297 		free(obj->path_packfile);
298 	free(obj);
299 }
300 
301 static int
302 commit_object_valid(struct got_commit_object *commit)
303 {
304 	int i;
305 	int n;
306 
307 	if (commit == NULL)
308 		return 0;
309 
310 	n = 0;
311 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
312 		if (commit->tree_id->sha1[i] == 0)
313 			n++;
314 	}
315 	if (n == SHA1_DIGEST_LENGTH)
316 		return 0;
317 
318 	return 1;
319 }
320 
321 static const struct got_error *
322 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
323 {
324 	const struct got_error *err = NULL;
325 	char *s = buf;
326 	size_t tlen;
327 	ssize_t remain = (ssize_t)len;
328  
329 	*commit = calloc(1, sizeof(**commit));
330 	if (*commit == NULL)
331 		return got_error(GOT_ERR_NO_MEM);
332 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
333 	if ((*commit)->tree_id == NULL) {
334 		free(*commit);
335 		*commit = NULL;
336 		return got_error(GOT_ERR_NO_MEM);
337 	}
338 
339 	SIMPLEQ_INIT(&(*commit)->parent_ids);
340 
341 	tlen = strlen(GOT_COMMIT_TAG_TREE);
342 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
343 		remain -= tlen;
344 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
345 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
346 			goto done;
347 		}
348 		s += tlen;
349 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
350 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
351 			goto done;
352 		}
353 		remain -= SHA1_DIGEST_STRING_LENGTH;
354 		s += SHA1_DIGEST_STRING_LENGTH;
355 	} else {
356 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
357 		goto done;
358 	}
359 
360 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
361 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
362 		struct got_parent_id *pid;
363 
364 		remain -= tlen;
365 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
366 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
367 			goto done;
368 		}
369 
370 		pid = calloc(1, sizeof(*pid));
371 		if (pid == NULL) {
372 			err = got_error(GOT_ERR_NO_MEM);
373 			goto done;
374 		}
375 		pid->id = calloc(1, sizeof(*pid->id));
376 		if (pid->id == NULL) {
377 			free(pid);
378 			err = got_error(GOT_ERR_NO_MEM);
379 			goto done;
380 		}
381 		s += tlen;
382 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
383 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
384 			free(pid->id);
385 			free(pid);
386 			goto done;
387 		}
388 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
389 		(*commit)->nparents++;
390 
391 		remain -= SHA1_DIGEST_STRING_LENGTH;
392 		s += SHA1_DIGEST_STRING_LENGTH;
393 	}
394 
395 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
396 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
397 		char *p;
398 
399 		remain -= tlen;
400 		if (remain <= 0) {
401 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
402 			goto done;
403 		}
404 		s += tlen;
405 		p = strchr(s, '\n');
406 		if (p == NULL) {
407 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
408 			goto done;
409 		}
410 		*p = '\0';
411 		(*commit)->author = strdup(s);
412 		if ((*commit)->author == NULL) {
413 			err = got_error(GOT_ERR_NO_MEM);
414 			goto done;
415 		}
416 		s += strlen((*commit)->author) + 1;
417 		remain -= strlen((*commit)->author) + 1;
418 	}
419 
420 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
421 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
422 		char *p;
423 
424 		remain -= tlen;
425 		if (remain <= 0) {
426 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
427 			goto done;
428 		}
429 		s += tlen;
430 		p = strchr(s, '\n');
431 		if (p == NULL) {
432 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
433 			goto done;
434 		}
435 		*p = '\0';
436 		(*commit)->committer = strdup(s);
437 		if ((*commit)->committer == NULL) {
438 			err = got_error(GOT_ERR_NO_MEM);
439 			goto done;
440 		}
441 		s += strlen((*commit)->committer) + 1;
442 		remain -= strlen((*commit)->committer) + 1;
443 	}
444 
445 	(*commit)->logmsg = strndup(s, remain);
446 	if ((*commit)->logmsg == NULL) {
447 		err = got_error(GOT_ERR_NO_MEM);
448 		goto done;
449 	}
450 done:
451 	if (err) {
452 		got_object_commit_close(*commit);
453 		*commit = NULL;
454 	}
455 	return err;
456 }
457 
458 static void
459 tree_entry_close(struct got_tree_entry *te)
460 {
461 	free(te->id);
462 	free(te->name);
463 	free(te);
464 }
465 
466 static const struct got_error *
467 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
468     size_t maxlen)
469 {
470 	char *p = buf, *space;
471 	const struct got_error *err = NULL;
472 	char hex[SHA1_DIGEST_STRING_LENGTH];
473 
474 	*te = calloc(1, sizeof(**te));
475 	if (*te == NULL)
476 		return got_error(GOT_ERR_NO_MEM);
477 
478 	(*te)->id = calloc(1, sizeof(*(*te)->id));
479 	if ((*te)->id == NULL) {
480 		free(*te);
481 		*te = NULL;
482 		return got_error(GOT_ERR_NO_MEM);
483 	}
484 
485 	*elen = strlen(buf) + 1;
486 	if (*elen > maxlen) {
487 		free(*te);
488 		*te = NULL;
489 		return got_error(GOT_ERR_BAD_OBJ_DATA);
490 	}
491 
492 	space = strchr(buf, ' ');
493 	if (space == NULL) {
494 		free(*te);
495 		*te = NULL;
496 		return got_error(GOT_ERR_BAD_OBJ_DATA);
497 	}
498 	while (*p != ' ') {
499 		if (*p < '0' && *p > '7') {
500 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
501 			goto done;
502 		}
503 		(*te)->mode <<= 3;
504 		(*te)->mode |= *p - '0';
505 		p++;
506 	}
507 
508 	(*te)->name = strdup(space + 1);
509 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
510 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
511 		goto done;
512 	}
513 	buf += strlen(buf) + 1;
514 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
515 	*elen += SHA1_DIGEST_LENGTH;
516 done:
517 	if (err) {
518 		tree_entry_close(*te);
519 		*te = NULL;
520 	}
521 	return err;
522 }
523 
524 static const struct got_error *
525 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
526     char *buf, size_t len)
527 {
528 	const struct got_error *err;
529 	size_t remain = len;
530 	int nentries;
531 
532 	*tree = calloc(1, sizeof(**tree));
533 	if (*tree == NULL)
534 		return got_error(GOT_ERR_NO_MEM);
535 
536 	SIMPLEQ_INIT(&(*tree)->entries);
537 
538 	while (remain > 0) {
539 		struct got_tree_entry *te;
540 		size_t elen;
541 
542 		err = parse_tree_entry(&te, &elen, buf, remain);
543 		if (err)
544 			return err;
545 		(*tree)->nentries++;
546 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
547 		buf += elen;
548 		remain -= elen;
549 	}
550 
551 	if (remain != 0) {
552 		got_object_tree_close(*tree);
553 		return got_error(GOT_ERR_BAD_OBJ_DATA);
554 	}
555 
556 	return NULL;
557 }
558 
559 static const struct got_error *
560 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
561 {
562 	const struct got_error *err = NULL;
563 	static const size_t blocksize = 512;
564 	size_t n, total, remain;
565 	uint8_t *buf;
566 
567 	*outbuf = NULL;
568 	*outlen = 0;
569 
570 	buf = calloc(1, blocksize);
571 	if (buf == NULL)
572 		return got_error(GOT_ERR_NO_MEM);
573 
574 	remain = blocksize;
575 	total = 0;
576 	while (1) {
577 		if (remain == 0) {
578 			uint8_t *newbuf;
579 			newbuf = reallocarray(buf, 1, total + blocksize);
580 			if (newbuf == NULL) {
581 				err = got_error(GOT_ERR_NO_MEM);
582 				goto done;
583 			}
584 			buf = newbuf;
585 			remain += blocksize;
586 		}
587 		n = fread(buf + total, 1, remain, f);
588 		if (n == 0) {
589 			if (ferror(f)) {
590 				err = got_ferror(f, GOT_ERR_IO);
591 				goto done;
592 			}
593 			break; /* EOF */
594 		}
595 		remain -= n;
596 		total += n;
597 	};
598 
599 done:
600 	if (err == NULL) {
601 		*outbuf = buf;
602 		*outlen = total;
603 	} else
604 		free(buf);
605 	return err;
606 }
607 
608 static const struct got_error *
609 read_commit_object(struct got_commit_object **commit,
610     struct got_repository *repo, struct got_object *obj, FILE *f)
611 {
612 	const struct got_error *err = NULL;
613 	size_t len;
614 	uint8_t *p;
615 	int i, ret;
616 
617 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
618 		err = read_to_mem(&p, &len, f);
619 	else
620 		err = got_inflate_to_mem(&p, &len, f);
621 	if (err)
622 		return err;
623 
624 	if (len < obj->hdrlen + obj->size) {
625 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
626 		goto done;
627 	}
628 
629 	/* Skip object header. */
630 	len -= obj->hdrlen;
631 	err = parse_commit_object(commit, p + obj->hdrlen, len);
632 	free(p);
633 done:
634 	return err;
635 }
636 
637 const struct got_error *
638 got_object_commit_open(struct got_commit_object **commit,
639     struct got_repository *repo, struct got_object *obj)
640 {
641 	const struct got_error *err = NULL;
642 	FILE *f;
643 
644 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
645 		return got_error(GOT_ERR_OBJ_TYPE);
646 
647 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
648 		err = got_packfile_extract_object(&f, obj, repo);
649 	else
650 		err = open_loose_object(&f, obj, repo);
651 	if (err)
652 		return err;
653 
654 	err = read_commit_object(commit, repo, obj, f);
655 	fclose(f);
656 	return err;
657 }
658 
659 void
660 got_object_commit_close(struct got_commit_object *commit)
661 {
662 	struct got_parent_id *pid;
663 
664 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
665 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
666 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
667 		free(pid->id);
668 		free(pid);
669 	}
670 
671 	free(commit->tree_id);
672 	free(commit->author);
673 	free(commit->committer);
674 	free(commit->logmsg);
675 	free(commit);
676 }
677 
678 static const struct got_error *
679 read_tree_object(struct got_tree_object **tree,
680     struct got_repository *repo, struct got_object *obj, FILE *f)
681 {
682 	const struct got_error *err = NULL;
683 	size_t len;
684 	uint8_t *p;
685 	int i, ret;
686 
687 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
688 		err = read_to_mem(&p, &len, f);
689 	else
690 		err = got_inflate_to_mem(&p, &len, f);
691 	if (err)
692 		return err;
693 
694 	if (len < obj->hdrlen + obj->size) {
695 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
696 		goto done;
697 	}
698 
699 	/* Skip object header. */
700 	len -= obj->hdrlen;
701 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
702 	free(p);
703 done:
704 	return err;
705 }
706 
707 const struct got_error *
708 got_object_tree_open(struct got_tree_object **tree,
709     struct got_repository *repo, struct got_object *obj)
710 {
711 	const struct got_error *err = NULL;
712 	FILE *f;
713 
714 	if (obj->type != GOT_OBJ_TYPE_TREE)
715 		return got_error(GOT_ERR_OBJ_TYPE);
716 
717 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
718 		err = got_packfile_extract_object(&f, obj, repo);
719 	else
720 		err = open_loose_object(&f, obj, repo);
721 	if (err)
722 		return err;
723 
724 	err = read_tree_object(tree, repo, obj, f);
725 	fclose(f);
726 	return err;
727 }
728 
729 void
730 got_object_tree_close(struct got_tree_object *tree)
731 {
732 	struct got_tree_entry *te;
733 
734 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
735 		te = SIMPLEQ_FIRST(&tree->entries);
736 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
737 		tree_entry_close(te);
738 	}
739 
740 	free(tree);
741 }
742 
743 const struct got_error *
744 got_object_blob_open(struct got_blob_object **blob,
745     struct got_repository *repo, struct got_object *obj, size_t blocksize)
746 {
747 	const struct got_error *err = NULL;
748 
749 	if (obj->type != GOT_OBJ_TYPE_BLOB)
750 		return got_error(GOT_ERR_OBJ_TYPE);
751 
752 	if (blocksize < obj->hdrlen)
753 		return got_error(GOT_ERR_NO_SPACE);
754 
755 	*blob = calloc(1, sizeof(**blob));
756 	if (*blob == NULL)
757 		return got_error(GOT_ERR_NO_MEM);
758 
759 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
760 		(*blob)->read_buf = calloc(1, blocksize);
761 		if ((*blob)->read_buf == NULL)
762 			return got_error(GOT_ERR_NO_MEM);
763 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
764 		if (err)
765 			return err;
766 	} else {
767 		err = open_loose_object(&((*blob)->f), obj, repo);
768 		if (err) {
769 			free(*blob);
770 			return err;
771 		}
772 
773 		err = got_inflate_init(&(*blob)->zb, blocksize);
774 		if (err != NULL) {
775 			fclose((*blob)->f);
776 			free(*blob);
777 			return err;
778 		}
779 
780 		(*blob)->read_buf = (*blob)->zb.outbuf;
781 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
782 	}
783 
784 	(*blob)->hdrlen = obj->hdrlen;
785 	(*blob)->blocksize = blocksize;
786 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
787 
788 	return err;
789 }
790 
791 void
792 got_object_blob_close(struct got_blob_object *blob)
793 {
794 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
795 		got_inflate_end(&blob->zb);
796 	else
797 		free(blob->read_buf);
798 	fclose(blob->f);
799 	free(blob);
800 }
801 
802 char *
803 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
804 {
805 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
806 }
807 
808 size_t
809 got_object_blob_get_hdrlen(struct got_blob_object *blob)
810 {
811 	return blob->hdrlen;
812 }
813 
814 const uint8_t *
815 got_object_blob_get_read_buf(struct got_blob_object *blob)
816 {
817 	return blob->read_buf;
818 }
819 
820 const struct got_error *
821 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
822 {
823 	size_t n;
824 
825 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
826 		return got_inflate_read(&blob->zb, blob->f, outlenp);
827 
828 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
829 	if (n == 0 && ferror(blob->f))
830 		return got_ferror(blob->f, GOT_ERR_IO);
831 	*outlenp = n;
832 	return NULL;
833 }