Gotweb

Blob

Date:: Sat Mar 17 17:13:19 2018 UTC
Message:: remove GOT_ERR_NO_MEM, we can just use errno in those cases
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_lib_sha1.h"
34 #include "got_lib_delta.h"
35 #include "got_lib_pack.h"
36 #include "got_lib_zbuf.h"
37 #include "got_lib_object.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_from_errno();
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 struct got_object_id *
81 got_object_id_dup(struct got_object_id *id1)
82 {
83 	struct got_object_id *id2;
84 
85 	id2 = malloc(sizeof(*id2));
86 	if (id2 == NULL)
87 		return NULL;
88 	memcpy(id2, id1, sizeof(*id2));
89 	return id2;
90 }
91 
92 int
93 got_object_get_type(struct got_object *obj)
94 {
95 	switch (obj->type) {
96 	case GOT_OBJ_TYPE_COMMIT:
97 	case GOT_OBJ_TYPE_TREE:
98 	case GOT_OBJ_TYPE_BLOB:
99 	case GOT_OBJ_TYPE_TAG:
100 		return obj->type;
101 	default:
102 		abort();
103 		break;
104 	}
105 
106 	/* not reached */
107 	return 0;
108 }
109 
110 static const struct got_error *
111 parse_object_header(struct got_object **obj, char *buf, size_t len)
112 {
113 	const char *obj_tags[] = {
114 		GOT_OBJ_TAG_COMMIT,
115 		GOT_OBJ_TAG_TREE,
116 		GOT_OBJ_TAG_BLOB
117 	};
118 	const int obj_types[] = {
119 		GOT_OBJ_TYPE_COMMIT,
120 		GOT_OBJ_TYPE_TREE,
121 		GOT_OBJ_TYPE_BLOB,
122 	};
123 	int type = 0;
124 	size_t size = 0, hdrlen = 0;
125 	int i;
126 	char *p = strchr(buf, '\0');
127 
128 	if (p == NULL)
129 		return got_error(GOT_ERR_BAD_OBJ_HDR);
130 
131 	hdrlen = strlen(buf) + 1 /* '\0' */;
132 
133 	for (i = 0; i < nitems(obj_tags); i++) {
134 		const char *tag = obj_tags[i];
135 		size_t tlen = strlen(tag);
136 		const char *errstr;
137 
138 		if (strncmp(buf, tag, tlen) != 0)
139 			continue;
140 
141 		type = obj_types[i];
142 		if (len <= tlen)
143 			return got_error(GOT_ERR_BAD_OBJ_HDR);
144 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
145 		if (errstr != NULL)
146 			return got_error(GOT_ERR_BAD_OBJ_HDR);
147 		break;
148 	}
149 
150 	if (type == 0)
151 		return got_error(GOT_ERR_BAD_OBJ_HDR);
152 
153 	*obj = calloc(1, sizeof(**obj));
154 	if (*obj == NULL)
155 		return got_error_from_errno();
156 	(*obj)->type = type;
157 	(*obj)->hdrlen = hdrlen;
158 	(*obj)->size = size;
159 	return NULL;
160 }
161 
162 static const struct got_error *
163 read_object_header(struct got_object **obj, struct got_repository *repo,
164     FILE *f)
165 {
166 	const struct got_error *err;
167 	struct got_zstream_buf zb;
168 	char *buf;
169 	const size_t zbsize = 64;
170 	size_t outlen, totlen;
171 	int i;
172 
173 	buf = calloc(zbsize, sizeof(char));
174 	if (buf == NULL)
175 		return got_error_from_errno();
176 
177 	err = got_inflate_init(&zb, NULL, zbsize);
178 	if (err)
179 		return err;
180 
181 	i = 0;
182 	totlen = 0;
183 	do {
184 		err = got_inflate_read(&zb, f, &outlen);
185 		if (err)
186 			goto done;
187 		if (strchr(zb.outbuf, '\0') == NULL) {
188 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
189 			if (buf == NULL) {
190 				err = got_error_from_errno();
191 				goto done;
192 			}
193 		}
194 		memcpy(buf + totlen, zb.outbuf, outlen);
195 		totlen += outlen;
196 		i++;
197 	} while (strchr(zb.outbuf, '\0') == NULL);
198 
199 	err = parse_object_header(obj, buf, totlen);
200 done:
201 	got_inflate_end(&zb);
202 	return err;
203 }
204 
205 static const struct got_error *
206 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
207 {
208 	const struct got_error *err = NULL;
209 	char *hex;
210 	char *path_objects = got_repo_get_path_objects(repo);
211 
212 	if (path_objects == NULL)
213 		return got_error_from_errno();
214 
215 	err = got_object_id_str(&hex, id);
216 	if (err)
217 		return err;
218 
219 	if (asprintf(path, "%s/%.2x/%s", path_objects,
220 	    id->sha1[0], hex + 2) == -1)
221 		err = got_error_from_errno();
222 
223 	free(hex);
224 	free(path_objects);
225 	return err;
226 }
227 
228 static const struct got_error *
229 open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
230 {
231 	const struct got_error *err = NULL;
232 	char *path;
233 
234 	err = object_path(&path, &obj->id, repo);
235 	if (err)
236 		return err;
237 	*f = fopen(path, "rb");
238 	if (*f == NULL) {
239 		err = got_error_from_errno();
240 		goto done;
241 	}
242 done:
243 	free(path);
244 	return err;
245 }
246 
247 const struct got_error *
248 got_object_open(struct got_object **obj, struct got_repository *repo,
249     struct got_object_id *id)
250 {
251 	const struct got_error *err = NULL;
252 	char *path;
253 	FILE *f;
254 
255 	err = object_path(&path, id, repo);
256 	if (err)
257 		return err;
258 
259 	f = fopen(path, "rb");
260 	if (f == NULL) {
261 		if (errno != ENOENT) {
262 			err = got_error_from_errno();
263 			goto done;
264 		}
265 		err = got_packfile_open_object(obj, id, repo);
266 		if (err)
267 			goto done;
268 		if (*obj == NULL)
269 			err = got_error(GOT_ERR_NO_OBJ);
270 	} else {
271 		err = read_object_header(obj, repo, f);
272 		if (err)
273 			goto done;
274 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
275 	}
276 done:
277 	free(path);
278 	if (f)
279 		fclose(f);
280 	return err;
281 
282 }
283 
284 const struct got_error *
285 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
286     const char *id_str)
287 {
288 	struct got_object_id id;
289 
290 	if (!got_parse_sha1_digest(id.sha1, id_str))
291 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
292 
293 	return got_object_open(obj, repo, &id);
294 }
295 
296 void
297 got_object_close(struct got_object *obj)
298 {
299 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
300 		struct got_delta *delta;
301 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
302 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
303 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
304 			got_delta_close(delta);
305 		}
306 	}
307 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
308 		free(obj->path_packfile);
309 	free(obj);
310 }
311 
312 static const struct got_error *
313 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
314 {
315 	const struct got_error *err = NULL;
316 	char *s = buf;
317 	size_t tlen;
318 	ssize_t remain = (ssize_t)len;
319  
320 	*commit = calloc(1, sizeof(**commit));
321 	if (*commit == NULL)
322 		return got_error_from_errno();
323 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
324 	if ((*commit)->tree_id == NULL) {
325 		err = got_error_from_errno();
326 		free(*commit);
327 		*commit = NULL;
328 		return err;
329 	}
330 
331 	SIMPLEQ_INIT(&(*commit)->parent_ids);
332 
333 	tlen = strlen(GOT_COMMIT_TAG_TREE);
334 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
335 		remain -= tlen;
336 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
337 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
338 			goto done;
339 		}
340 		s += tlen;
341 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
342 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
343 			goto done;
344 		}
345 		remain -= SHA1_DIGEST_STRING_LENGTH;
346 		s += SHA1_DIGEST_STRING_LENGTH;
347 	} else {
348 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
349 		goto done;
350 	}
351 
352 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
353 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
354 		struct got_parent_id *pid;
355 
356 		remain -= tlen;
357 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
358 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
359 			goto done;
360 		}
361 
362 		pid = calloc(1, sizeof(*pid));
363 		if (pid == NULL) {
364 			err = got_error_from_errno();
365 			goto done;
366 		}
367 		pid->id = calloc(1, sizeof(*pid->id));
368 		if (pid->id == NULL) {
369 			err = got_error_from_errno();
370 			free(pid);
371 			goto done;
372 		}
373 		s += tlen;
374 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
375 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
376 			free(pid->id);
377 			free(pid);
378 			goto done;
379 		}
380 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
381 		(*commit)->nparents++;
382 
383 		remain -= SHA1_DIGEST_STRING_LENGTH;
384 		s += SHA1_DIGEST_STRING_LENGTH;
385 	}
386 
387 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
388 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
389 		char *p;
390 
391 		remain -= tlen;
392 		if (remain <= 0) {
393 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
394 			goto done;
395 		}
396 		s += tlen;
397 		p = strchr(s, '\n');
398 		if (p == NULL) {
399 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
400 			goto done;
401 		}
402 		*p = '\0';
403 		(*commit)->author = strdup(s);
404 		if ((*commit)->author == NULL) {
405 			err = got_error_from_errno();
406 			goto done;
407 		}
408 		s += strlen((*commit)->author) + 1;
409 		remain -= strlen((*commit)->author) + 1;
410 	}
411 
412 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
413 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
414 		char *p;
415 
416 		remain -= tlen;
417 		if (remain <= 0) {
418 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
419 			goto done;
420 		}
421 		s += tlen;
422 		p = strchr(s, '\n');
423 		if (p == NULL) {
424 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
425 			goto done;
426 		}
427 		*p = '\0';
428 		(*commit)->committer = strdup(s);
429 		if ((*commit)->committer == NULL) {
430 			err = got_error_from_errno();
431 			goto done;
432 		}
433 		s += strlen((*commit)->committer) + 1;
434 		remain -= strlen((*commit)->committer) + 1;
435 	}
436 
437 	(*commit)->logmsg = strndup(s, remain);
438 	if ((*commit)->logmsg == NULL) {
439 		err = got_error_from_errno();
440 		goto done;
441 	}
442 done:
443 	if (err) {
444 		got_object_commit_close(*commit);
445 		*commit = NULL;
446 	}
447 	return err;
448 }
449 
450 static void
451 tree_entry_close(struct got_tree_entry *te)
452 {
453 	free(te->id);
454 	free(te->name);
455 	free(te);
456 }
457 
458 static const struct got_error *
459 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
460     size_t maxlen)
461 {
462 	char *p = buf, *space;
463 	const struct got_error *err = NULL;
464 
465 	*te = calloc(1, sizeof(**te));
466 	if (*te == NULL)
467 		return got_error_from_errno();
468 
469 	(*te)->id = calloc(1, sizeof(*(*te)->id));
470 	if ((*te)->id == NULL) {
471 		err = got_error_from_errno();
472 		free(*te);
473 		*te = NULL;
474 		return err;
475 	}
476 
477 	*elen = strlen(buf) + 1;
478 	if (*elen > maxlen) {
479 		free(*te);
480 		*te = NULL;
481 		return got_error(GOT_ERR_BAD_OBJ_DATA);
482 	}
483 
484 	space = strchr(buf, ' ');
485 	if (space == NULL) {
486 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
487 		free(*te);
488 		*te = NULL;
489 		return err;
490 	}
491 	while (*p != ' ') {
492 		if (*p < '0' && *p > '7') {
493 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
494 			goto done;
495 		}
496 		(*te)->mode <<= 3;
497 		(*te)->mode |= *p - '0';
498 		p++;
499 	}
500 
501 	(*te)->name = strdup(space + 1);
502 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
503 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
504 		goto done;
505 	}
506 	buf += strlen(buf) + 1;
507 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
508 	*elen += SHA1_DIGEST_LENGTH;
509 done:
510 	if (err) {
511 		tree_entry_close(*te);
512 		*te = NULL;
513 	}
514 	return err;
515 }
516 
517 static const struct got_error *
518 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
519     uint8_t *buf, size_t len)
520 {
521 	const struct got_error *err;
522 	size_t remain = len;
523 
524 	*tree = calloc(1, sizeof(**tree));
525 	if (*tree == NULL)
526 		return got_error_from_errno();
527 
528 	SIMPLEQ_INIT(&(*tree)->entries);
529 
530 	while (remain > 0) {
531 		struct got_tree_entry *te;
532 		size_t elen;
533 
534 		err = parse_tree_entry(&te, &elen, buf, remain);
535 		if (err)
536 			return err;
537 		(*tree)->nentries++;
538 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
539 		buf += elen;
540 		remain -= elen;
541 	}
542 
543 	if (remain != 0) {
544 		got_object_tree_close(*tree);
545 		return got_error(GOT_ERR_BAD_OBJ_DATA);
546 	}
547 
548 	return NULL;
549 }
550 
551 static const struct got_error *
552 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
553 {
554 	const struct got_error *err = NULL;
555 	static const size_t blocksize = 512;
556 	size_t n, total, remain;
557 	uint8_t *buf;
558 
559 	*outbuf = NULL;
560 	*outlen = 0;
561 
562 	buf = calloc(1, blocksize);
563 	if (buf == NULL)
564 		return got_error_from_errno();
565 
566 	remain = blocksize;
567 	total = 0;
568 	while (1) {
569 		if (remain == 0) {
570 			uint8_t *newbuf;
571 			newbuf = reallocarray(buf, 1, total + blocksize);
572 			if (newbuf == NULL) {
573 				err = got_error_from_errno();
574 				goto done;
575 			}
576 			buf = newbuf;
577 			remain += blocksize;
578 		}
579 		n = fread(buf + total, 1, remain, f);
580 		if (n == 0) {
581 			if (ferror(f)) {
582 				err = got_ferror(f, GOT_ERR_IO);
583 				goto done;
584 			}
585 			break; /* EOF */
586 		}
587 		remain -= n;
588 		total += n;
589 	};
590 
591 done:
592 	if (err == NULL) {
593 		*outbuf = buf;
594 		*outlen = total;
595 	} else
596 		free(buf);
597 	return err;
598 }
599 
600 static const struct got_error *
601 read_commit_object(struct got_commit_object **commit,
602     struct got_repository *repo, struct got_object *obj, FILE *f)
603 {
604 	const struct got_error *err = NULL;
605 	size_t len;
606 	uint8_t *p;
607 
608 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
609 		err = read_to_mem(&p, &len, f);
610 	else
611 		err = got_inflate_to_mem(&p, &len, f);
612 	if (err)
613 		return err;
614 
615 	if (len < obj->hdrlen + obj->size) {
616 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
617 		goto done;
618 	}
619 
620 	/* Skip object header. */
621 	len -= obj->hdrlen;
622 	err = parse_commit_object(commit, p + obj->hdrlen, len);
623 	free(p);
624 done:
625 	return err;
626 }
627 
628 const struct got_error *
629 got_object_commit_open(struct got_commit_object **commit,
630     struct got_repository *repo, struct got_object *obj)
631 {
632 	const struct got_error *err = NULL;
633 
634 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
635 		return got_error(GOT_ERR_OBJ_TYPE);
636 
637 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
638 		uint8_t *buf;
639 		size_t len;
640 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
641 		if (err)
642 			return err;
643 		obj->size = len;
644 		err = parse_commit_object(commit, buf, len);
645 		free(buf);
646 	} else {
647 		FILE *f;
648 		err = open_loose_object(&f, obj, repo);
649 		if (err)
650 			return err;
651 		err = read_commit_object(commit, repo, obj, f);
652 		fclose(f);
653 	}
654 	return err;
655 }
656 
657 void
658 got_object_commit_close(struct got_commit_object *commit)
659 {
660 	struct got_parent_id *pid;
661 
662 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
663 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
664 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
665 		free(pid->id);
666 		free(pid);
667 	}
668 
669 	free(commit->tree_id);
670 	free(commit->author);
671 	free(commit->committer);
672 	free(commit->logmsg);
673 	free(commit);
674 }
675 
676 static const struct got_error *
677 read_tree_object(struct got_tree_object **tree,
678     struct got_repository *repo, struct got_object *obj, FILE *f)
679 {
680 	const struct got_error *err = NULL;
681 	size_t len;
682 	uint8_t *p;
683 
684 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
685 		err = read_to_mem(&p, &len, f);
686 	else
687 		err = got_inflate_to_mem(&p, &len, f);
688 	if (err)
689 		return err;
690 
691 	if (len < obj->hdrlen + obj->size) {
692 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
693 		goto done;
694 	}
695 
696 	/* Skip object header. */
697 	len -= obj->hdrlen;
698 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
699 	free(p);
700 done:
701 	return err;
702 }
703 
704 const struct got_error *
705 got_object_tree_open(struct got_tree_object **tree,
706     struct got_repository *repo, struct got_object *obj)
707 {
708 	const struct got_error *err = NULL;
709 
710 	if (obj->type != GOT_OBJ_TYPE_TREE)
711 		return got_error(GOT_ERR_OBJ_TYPE);
712 
713 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
714 		uint8_t *buf;
715 		size_t len;
716 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
717 		if (err)
718 			return err;
719 		obj->size = len;
720 		err = parse_tree_object(tree, repo, buf, len);
721 		free(buf);
722 	} else {
723 		FILE *f;
724 		err = open_loose_object(&f, obj, repo);
725 		if (err)
726 			return err;
727 		err = read_tree_object(tree, repo, obj, f);
728 		fclose(f);
729 	}
730 	return err;
731 }
732 
733 void
734 got_object_tree_close(struct got_tree_object *tree)
735 {
736 	struct got_tree_entry *te;
737 
738 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
739 		te = SIMPLEQ_FIRST(&tree->entries);
740 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
741 		tree_entry_close(te);
742 	}
743 
744 	free(tree);
745 }
746 
747 const struct got_error *
748 got_object_blob_open(struct got_blob_object **blob,
749     struct got_repository *repo, struct got_object *obj, size_t blocksize)
750 {
751 	const struct got_error *err = NULL;
752 
753 	if (obj->type != GOT_OBJ_TYPE_BLOB)
754 		return got_error(GOT_ERR_OBJ_TYPE);
755 
756 	if (blocksize < obj->hdrlen)
757 		return got_error(GOT_ERR_NO_SPACE);
758 
759 	*blob = calloc(1, sizeof(**blob));
760 	if (*blob == NULL)
761 		return got_error_from_errno();
762 
763 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
764 		(*blob)->read_buf = calloc(1, blocksize);
765 		if ((*blob)->read_buf == NULL) {
766 			err = got_error_from_errno();
767 			free(*blob);
768 			*blob = NULL;
769 			return err;
770 		}
771 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
772 		if (err) {
773 			free((*blob)->read_buf);
774 			free(*blob);
775 			*blob = NULL;
776 			return err;
777 		}
778 	} else {
779 		err = open_loose_object(&((*blob)->f), obj, repo);
780 		if (err) {
781 			free(*blob);
782 			*blob = NULL;
783 			return err;
784 		}
785 
786 		err = got_inflate_init(&(*blob)->zb, NULL, blocksize);
787 		if (err != NULL) {
788 			fclose((*blob)->f);
789 			free(*blob);
790 			*blob = NULL;
791 			return err;
792 		}
793 
794 		(*blob)->read_buf = (*blob)->zb.outbuf;
795 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
796 	}
797 
798 	(*blob)->hdrlen = obj->hdrlen;
799 	(*blob)->blocksize = blocksize;
800 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
801 
802 	return err;
803 }
804 
805 void
806 got_object_blob_close(struct got_blob_object *blob)
807 {
808 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
809 		got_inflate_end(&blob->zb);
810 	else
811 		free(blob->read_buf);
812 	fclose(blob->f);
813 	free(blob);
814 }
815 
816 char *
817 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
818 {
819 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
820 }
821 
822 size_t
823 got_object_blob_get_hdrlen(struct got_blob_object *blob)
824 {
825 	return blob->hdrlen;
826 }
827 
828 const uint8_t *
829 got_object_blob_get_read_buf(struct got_blob_object *blob)
830 {
831 	return blob->read_buf;
832 }
833 
834 const struct got_error *
835 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
836 {
837 	size_t n;
838 
839 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
840 		return got_inflate_read(&blob->zb, blob->f, outlenp);
841 
842 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
843 	if (n == 0 && ferror(blob->f))
844 		return got_ferror(blob->f, GOT_ERR_IO);
845 	*outlenp = n;
846 	return NULL;
847 }