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Blob

Date:: Mon Mar 12 12:59:29 2018 UTC
Message:: use stricter CPPFLAGS from mpi
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_lib.h"
34 #include "got_delta_lib.h"
35 #include "got_pack_lib.h"
36 #include "got_zbuf_lib.h"
37 #include "got_object_lib.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 	const size_t zbsize = 64;
158 	size_t outlen, totlen;
159 	int i;
160 
161 	buf = calloc(zbsize, sizeof(char));
162 	if (buf == NULL)
163 		return got_error(GOT_ERR_NO_MEM);
164 
165 	err = got_inflate_init(&zb, zbsize);
166 	if (err)
167 		return err;
168 
169 	i = 0;
170 	totlen = 0;
171 	do {
172 		err = got_inflate_read(&zb, f, &outlen);
173 		if (err)
174 			goto done;
175 		if (strchr(zb.outbuf, '\0') == NULL) {
176 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
177 			if (buf == NULL) {
178 				err = got_error(GOT_ERR_NO_MEM);
179 				goto done;
180 			}
181 		}
182 		memcpy(buf + totlen, zb.outbuf, outlen);
183 		totlen += outlen;
184 		i++;
185 	} while (strchr(zb.outbuf, '\0') == NULL);
186 
187 	err = parse_object_header(obj, buf, totlen);
188 done:
189 	got_inflate_end(&zb);
190 	return err;
191 }
192 
193 static const struct got_error *
194 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
195 {
196 	const struct got_error *err = NULL;
197 	char *hex;
198 	char *path_objects = got_repo_get_path_objects(repo);
199 
200 	if (path_objects == NULL)
201 		return got_error(GOT_ERR_NO_MEM);
202 
203 	err = got_object_id_str(&hex, id);
204 	if (err)
205 		return err;
206 
207 	if (asprintf(path, "%s/%.2x/%s", path_objects,
208 	    id->sha1[0], hex + 2) == -1)
209 		err = got_error(GOT_ERR_NO_MEM);
210 
211 	free(hex);
212 	free(path_objects);
213 	return err;
214 }
215 
216 static const struct got_error *
217 open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
218 {
219 	const struct got_error *err = NULL;
220 	char *path;
221 
222 	err = object_path(&path, &obj->id, repo);
223 	if (err)
224 		return err;
225 	*f = fopen(path, "rb");
226 	if (*f == NULL) {
227 		err = got_error_from_errno();
228 		goto done;
229 	}
230 done:
231 	free(path);
232 	return err;
233 }
234 
235 const struct got_error *
236 got_object_open(struct got_object **obj, struct got_repository *repo,
237     struct got_object_id *id)
238 {
239 	const struct got_error *err = NULL;
240 	char *path;
241 	FILE *f;
242 
243 	err = object_path(&path, id, repo);
244 	if (err)
245 		return err;
246 
247 	f = fopen(path, "rb");
248 	if (f == NULL) {
249 		if (errno != ENOENT) {
250 			err = got_error_from_errno();
251 			goto done;
252 		}
253 		err = got_packfile_open_object(obj, id, repo);
254 		if (err)
255 			goto done;
256 		if (*obj == NULL)
257 			err = got_error(GOT_ERR_NO_OBJ);
258 	} else {
259 		err = read_object_header(obj, repo, f);
260 		if (err)
261 			goto done;
262 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
263 	}
264 done:
265 	free(path);
266 	if (err && f)
267 		fclose(f);
268 	return err;
269 
270 }
271 
272 const struct got_error *
273 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
274     const char *id_str)
275 {
276 	struct got_object_id id;
277 
278 	if (!got_parse_sha1_digest(id.sha1, id_str))
279 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
280 
281 	return got_object_open(obj, repo, &id);
282 }
283 
284 void
285 got_object_close(struct got_object *obj)
286 {
287 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
288 		struct got_delta *delta;
289 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
290 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
291 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
292 			got_delta_close(delta);
293 		}
294 	}
295 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
296 		free(obj->path_packfile);
297 	free(obj);
298 }
299 
300 static const struct got_error *
301 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
302 {
303 	const struct got_error *err = NULL;
304 	char *s = buf;
305 	size_t tlen;
306 	ssize_t remain = (ssize_t)len;
307  
308 	*commit = calloc(1, sizeof(**commit));
309 	if (*commit == NULL)
310 		return got_error(GOT_ERR_NO_MEM);
311 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
312 	if ((*commit)->tree_id == NULL) {
313 		free(*commit);
314 		*commit = NULL;
315 		return got_error(GOT_ERR_NO_MEM);
316 	}
317 
318 	SIMPLEQ_INIT(&(*commit)->parent_ids);
319 
320 	tlen = strlen(GOT_COMMIT_TAG_TREE);
321 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
322 		remain -= tlen;
323 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
324 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
325 			goto done;
326 		}
327 		s += tlen;
328 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
329 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
330 			goto done;
331 		}
332 		remain -= SHA1_DIGEST_STRING_LENGTH;
333 		s += SHA1_DIGEST_STRING_LENGTH;
334 	} else {
335 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
336 		goto done;
337 	}
338 
339 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
340 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
341 		struct got_parent_id *pid;
342 
343 		remain -= tlen;
344 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
345 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
346 			goto done;
347 		}
348 
349 		pid = calloc(1, sizeof(*pid));
350 		if (pid == NULL) {
351 			err = got_error(GOT_ERR_NO_MEM);
352 			goto done;
353 		}
354 		pid->id = calloc(1, sizeof(*pid->id));
355 		if (pid->id == NULL) {
356 			free(pid);
357 			err = got_error(GOT_ERR_NO_MEM);
358 			goto done;
359 		}
360 		s += tlen;
361 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
362 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
363 			free(pid->id);
364 			free(pid);
365 			goto done;
366 		}
367 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
368 		(*commit)->nparents++;
369 
370 		remain -= SHA1_DIGEST_STRING_LENGTH;
371 		s += SHA1_DIGEST_STRING_LENGTH;
372 	}
373 
374 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
375 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
376 		char *p;
377 
378 		remain -= tlen;
379 		if (remain <= 0) {
380 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
381 			goto done;
382 		}
383 		s += tlen;
384 		p = strchr(s, '\n');
385 		if (p == NULL) {
386 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
387 			goto done;
388 		}
389 		*p = '\0';
390 		(*commit)->author = strdup(s);
391 		if ((*commit)->author == NULL) {
392 			err = got_error(GOT_ERR_NO_MEM);
393 			goto done;
394 		}
395 		s += strlen((*commit)->author) + 1;
396 		remain -= strlen((*commit)->author) + 1;
397 	}
398 
399 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
400 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
401 		char *p;
402 
403 		remain -= tlen;
404 		if (remain <= 0) {
405 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
406 			goto done;
407 		}
408 		s += tlen;
409 		p = strchr(s, '\n');
410 		if (p == NULL) {
411 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
412 			goto done;
413 		}
414 		*p = '\0';
415 		(*commit)->committer = strdup(s);
416 		if ((*commit)->committer == NULL) {
417 			err = got_error(GOT_ERR_NO_MEM);
418 			goto done;
419 		}
420 		s += strlen((*commit)->committer) + 1;
421 		remain -= strlen((*commit)->committer) + 1;
422 	}
423 
424 	(*commit)->logmsg = strndup(s, remain);
425 	if ((*commit)->logmsg == NULL) {
426 		err = got_error(GOT_ERR_NO_MEM);
427 		goto done;
428 	}
429 done:
430 	if (err) {
431 		got_object_commit_close(*commit);
432 		*commit = NULL;
433 	}
434 	return err;
435 }
436 
437 static void
438 tree_entry_close(struct got_tree_entry *te)
439 {
440 	free(te->id);
441 	free(te->name);
442 	free(te);
443 }
444 
445 static const struct got_error *
446 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
447     size_t maxlen)
448 {
449 	char *p = buf, *space;
450 	const struct got_error *err = NULL;
451 
452 	*te = calloc(1, sizeof(**te));
453 	if (*te == NULL)
454 		return got_error(GOT_ERR_NO_MEM);
455 
456 	(*te)->id = calloc(1, sizeof(*(*te)->id));
457 	if ((*te)->id == NULL) {
458 		free(*te);
459 		*te = NULL;
460 		return got_error(GOT_ERR_NO_MEM);
461 	}
462 
463 	*elen = strlen(buf) + 1;
464 	if (*elen > maxlen) {
465 		free(*te);
466 		*te = NULL;
467 		return got_error(GOT_ERR_BAD_OBJ_DATA);
468 	}
469 
470 	space = strchr(buf, ' ');
471 	if (space == NULL) {
472 		free(*te);
473 		*te = NULL;
474 		return got_error(GOT_ERR_BAD_OBJ_DATA);
475 	}
476 	while (*p != ' ') {
477 		if (*p < '0' && *p > '7') {
478 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
479 			goto done;
480 		}
481 		(*te)->mode <<= 3;
482 		(*te)->mode |= *p - '0';
483 		p++;
484 	}
485 
486 	(*te)->name = strdup(space + 1);
487 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
488 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
489 		goto done;
490 	}
491 	buf += strlen(buf) + 1;
492 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
493 	*elen += SHA1_DIGEST_LENGTH;
494 done:
495 	if (err) {
496 		tree_entry_close(*te);
497 		*te = NULL;
498 	}
499 	return err;
500 }
501 
502 static const struct got_error *
503 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
504     char *buf, size_t len)
505 {
506 	const struct got_error *err;
507 	size_t remain = len;
508 
509 	*tree = calloc(1, sizeof(**tree));
510 	if (*tree == NULL)
511 		return got_error(GOT_ERR_NO_MEM);
512 
513 	SIMPLEQ_INIT(&(*tree)->entries);
514 
515 	while (remain > 0) {
516 		struct got_tree_entry *te;
517 		size_t elen;
518 
519 		err = parse_tree_entry(&te, &elen, buf, remain);
520 		if (err)
521 			return err;
522 		(*tree)->nentries++;
523 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
524 		buf += elen;
525 		remain -= elen;
526 	}
527 
528 	if (remain != 0) {
529 		got_object_tree_close(*tree);
530 		return got_error(GOT_ERR_BAD_OBJ_DATA);
531 	}
532 
533 	return NULL;
534 }
535 
536 static const struct got_error *
537 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
538 {
539 	const struct got_error *err = NULL;
540 	static const size_t blocksize = 512;
541 	size_t n, total, remain;
542 	uint8_t *buf;
543 
544 	*outbuf = NULL;
545 	*outlen = 0;
546 
547 	buf = calloc(1, blocksize);
548 	if (buf == NULL)
549 		return got_error(GOT_ERR_NO_MEM);
550 
551 	remain = blocksize;
552 	total = 0;
553 	while (1) {
554 		if (remain == 0) {
555 			uint8_t *newbuf;
556 			newbuf = reallocarray(buf, 1, total + blocksize);
557 			if (newbuf == NULL) {
558 				err = got_error(GOT_ERR_NO_MEM);
559 				goto done;
560 			}
561 			buf = newbuf;
562 			remain += blocksize;
563 		}
564 		n = fread(buf + total, 1, remain, f);
565 		if (n == 0) {
566 			if (ferror(f)) {
567 				err = got_ferror(f, GOT_ERR_IO);
568 				goto done;
569 			}
570 			break; /* EOF */
571 		}
572 		remain -= n;
573 		total += n;
574 	};
575 
576 done:
577 	if (err == NULL) {
578 		*outbuf = buf;
579 		*outlen = total;
580 	} else
581 		free(buf);
582 	return err;
583 }
584 
585 static const struct got_error *
586 read_commit_object(struct got_commit_object **commit,
587     struct got_repository *repo, struct got_object *obj, FILE *f)
588 {
589 	const struct got_error *err = NULL;
590 	size_t len;
591 	uint8_t *p;
592 
593 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
594 		err = read_to_mem(&p, &len, f);
595 	else
596 		err = got_inflate_to_mem(&p, &len, f);
597 	if (err)
598 		return err;
599 
600 	if (len < obj->hdrlen + obj->size) {
601 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
602 		goto done;
603 	}
604 
605 	/* Skip object header. */
606 	len -= obj->hdrlen;
607 	err = parse_commit_object(commit, p + obj->hdrlen, len);
608 	free(p);
609 done:
610 	return err;
611 }
612 
613 const struct got_error *
614 got_object_commit_open(struct got_commit_object **commit,
615     struct got_repository *repo, struct got_object *obj)
616 {
617 	const struct got_error *err = NULL;
618 	FILE *f;
619 
620 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
621 		return got_error(GOT_ERR_OBJ_TYPE);
622 
623 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
624 		err = got_packfile_extract_object(&f, obj, repo);
625 	else
626 		err = open_loose_object(&f, obj, repo);
627 	if (err)
628 		return err;
629 
630 	err = read_commit_object(commit, repo, obj, f);
631 	fclose(f);
632 	return err;
633 }
634 
635 void
636 got_object_commit_close(struct got_commit_object *commit)
637 {
638 	struct got_parent_id *pid;
639 
640 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
641 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
642 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
643 		free(pid->id);
644 		free(pid);
645 	}
646 
647 	free(commit->tree_id);
648 	free(commit->author);
649 	free(commit->committer);
650 	free(commit->logmsg);
651 	free(commit);
652 }
653 
654 static const struct got_error *
655 read_tree_object(struct got_tree_object **tree,
656     struct got_repository *repo, struct got_object *obj, FILE *f)
657 {
658 	const struct got_error *err = NULL;
659 	size_t len;
660 	uint8_t *p;
661 
662 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
663 		err = read_to_mem(&p, &len, f);
664 	else
665 		err = got_inflate_to_mem(&p, &len, f);
666 	if (err)
667 		return err;
668 
669 	if (len < obj->hdrlen + obj->size) {
670 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
671 		goto done;
672 	}
673 
674 	/* Skip object header. */
675 	len -= obj->hdrlen;
676 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
677 	free(p);
678 done:
679 	return err;
680 }
681 
682 const struct got_error *
683 got_object_tree_open(struct got_tree_object **tree,
684     struct got_repository *repo, struct got_object *obj)
685 {
686 	const struct got_error *err = NULL;
687 	FILE *f;
688 
689 	if (obj->type != GOT_OBJ_TYPE_TREE)
690 		return got_error(GOT_ERR_OBJ_TYPE);
691 
692 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
693 		err = got_packfile_extract_object(&f, obj, repo);
694 	else
695 		err = open_loose_object(&f, obj, repo);
696 	if (err)
697 		return err;
698 
699 	err = read_tree_object(tree, repo, obj, f);
700 	fclose(f);
701 	return err;
702 }
703 
704 void
705 got_object_tree_close(struct got_tree_object *tree)
706 {
707 	struct got_tree_entry *te;
708 
709 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
710 		te = SIMPLEQ_FIRST(&tree->entries);
711 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
712 		tree_entry_close(te);
713 	}
714 
715 	free(tree);
716 }
717 
718 const struct got_error *
719 got_object_blob_open(struct got_blob_object **blob,
720     struct got_repository *repo, struct got_object *obj, size_t blocksize)
721 {
722 	const struct got_error *err = NULL;
723 
724 	if (obj->type != GOT_OBJ_TYPE_BLOB)
725 		return got_error(GOT_ERR_OBJ_TYPE);
726 
727 	if (blocksize < obj->hdrlen)
728 		return got_error(GOT_ERR_NO_SPACE);
729 
730 	*blob = calloc(1, sizeof(**blob));
731 	if (*blob == NULL)
732 		return got_error(GOT_ERR_NO_MEM);
733 
734 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
735 		(*blob)->read_buf = calloc(1, blocksize);
736 		if ((*blob)->read_buf == NULL)
737 			return got_error(GOT_ERR_NO_MEM);
738 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
739 		if (err)
740 			return err;
741 	} else {
742 		err = open_loose_object(&((*blob)->f), obj, repo);
743 		if (err) {
744 			free(*blob);
745 			return err;
746 		}
747 
748 		err = got_inflate_init(&(*blob)->zb, blocksize);
749 		if (err != NULL) {
750 			fclose((*blob)->f);
751 			free(*blob);
752 			return err;
753 		}
754 
755 		(*blob)->read_buf = (*blob)->zb.outbuf;
756 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
757 	}
758 
759 	(*blob)->hdrlen = obj->hdrlen;
760 	(*blob)->blocksize = blocksize;
761 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
762 
763 	return err;
764 }
765 
766 void
767 got_object_blob_close(struct got_blob_object *blob)
768 {
769 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
770 		got_inflate_end(&blob->zb);
771 	else
772 		free(blob->read_buf);
773 	fclose(blob->f);
774 	free(blob);
775 }
776 
777 char *
778 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
779 {
780 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
781 }
782 
783 size_t
784 got_object_blob_get_hdrlen(struct got_blob_object *blob)
785 {
786 	return blob->hdrlen;
787 }
788 
789 const uint8_t *
790 got_object_blob_get_read_buf(struct got_blob_object *blob)
791 {
792 	return blob->read_buf;
793 }
794 
795 const struct got_error *
796 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
797 {
798 	size_t n;
799 
800 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
801 		return got_inflate_read(&blob->zb, blob->f, outlenp);
802 
803 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
804 	if (n == 0 && ferror(blob->f))
805 		return got_ferror(blob->f, GOT_ERR_IO);
806 	*outlenp = n;
807 	return NULL;
808 }