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Date:: Sun Feb 11 17:16:43 2018 UTC
Message:: more progress on reading packed/deltified objects
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 #include "got_sha1.h"
33 #include "pack.h"
34 #include "delta.h"
35 #include "object.h"
36 #include "zb.h"
37 
38 #ifndef MIN
39 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
40 #endif
41 
42 #ifndef nitems
43 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
44 #endif
45 
46 #define GOT_OBJ_TAG_COMMIT	"commit"
47 #define GOT_OBJ_TAG_TREE	"tree"
48 #define GOT_OBJ_TAG_BLOB	"blob"
49 
50 #define GOT_COMMIT_TAG_TREE		"tree "
51 #define GOT_COMMIT_TAG_PARENT		"parent "
52 #define GOT_COMMIT_TAG_AUTHOR		"author "
53 #define GOT_COMMIT_TAG_COMMITTER	"committer "
54 
55 char *
56 got_object_id_str(struct got_object_id *id, char *buf, size_t size)
57 {
58 	return got_sha1_digest_to_str(id->sha1, buf, size);
59 }
60 
61 int
62 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
63 {
64 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
65 }
66 
67 int
68 got_object_get_type(struct got_object *obj)
69 {
70 	switch (obj->type) {
71 	case GOT_OBJ_TYPE_COMMIT:
72 	case GOT_OBJ_TYPE_TREE:
73 	case GOT_OBJ_TYPE_BLOB:
74 	case GOT_OBJ_TYPE_TAG:
75 		return obj->type;
76 	default:
77 		abort();
78 		break;
79 	}
80 
81 	/* not reached */
82 	return 0;
83 }
84 
85 static const struct got_error *
86 parse_object_header(struct got_object **obj, char *buf, size_t len)
87 {
88 	const char *obj_tags[] = {
89 		GOT_OBJ_TAG_COMMIT,
90 		GOT_OBJ_TAG_TREE,
91 		GOT_OBJ_TAG_BLOB
92 	};
93 	const int obj_types[] = {
94 		GOT_OBJ_TYPE_COMMIT,
95 		GOT_OBJ_TYPE_TREE,
96 		GOT_OBJ_TYPE_BLOB,
97 	};
98 	int type = 0;
99 	size_t size = 0, hdrlen = 0;
100 	int i;
101 	char *p = strchr(buf, '\0');
102 
103 	if (p == NULL)
104 		return got_error(GOT_ERR_BAD_OBJ_HDR);
105 
106 	hdrlen = strlen(buf) + 1 /* '\0' */;
107 
108 	for (i = 0; i < nitems(obj_tags); i++) {
109 		const char *tag = obj_tags[i];
110 		size_t tlen = strlen(tag);
111 		const char *errstr;
112 
113 		if (strncmp(buf, tag, tlen) != 0)
114 			continue;
115 
116 		type = obj_types[i];
117 		if (len <= tlen)
118 			return got_error(GOT_ERR_BAD_OBJ_HDR);
119 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
120 		if (errstr != NULL)
121 			return got_error(GOT_ERR_BAD_OBJ_HDR);
122 		break;
123 	}
124 
125 	if (type == 0)
126 		return got_error(GOT_ERR_BAD_OBJ_HDR);
127 
128 	*obj = calloc(1, sizeof(**obj));
129 	if (*obj == NULL)
130 		return got_error(GOT_ERR_NO_MEM);
131 	(*obj)->type = type;
132 	(*obj)->hdrlen = hdrlen;
133 	(*obj)->size = size;
134 	return NULL;
135 }
136 
137 static const struct got_error *
138 read_object_header(struct got_object **obj, struct got_repository *repo,
139     FILE *f)
140 {
141 	const struct got_error *err;
142 	struct got_zstream_buf zb;
143 	char *buf;
144 	size_t len;
145 	const size_t zbsize = 64;
146 	size_t outlen, totlen;
147 	int i, ret;
148 
149 	buf = calloc(zbsize, sizeof(char));
150 	if (buf == NULL)
151 		return got_error(GOT_ERR_NO_MEM);
152 
153 	err = got_inflate_init(&zb, zbsize);
154 	if (err)
155 		return err;
156 
157 	i = 0;
158 	totlen = 0;
159 	do {
160 		err = got_inflate_read(&zb, f, &outlen);
161 		if (err)
162 			goto done;
163 		if (strchr(zb.outbuf, '\0') == NULL) {
164 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
165 			if (buf == NULL) {
166 				err = got_error(GOT_ERR_NO_MEM);
167 				goto done;
168 			}
169 		}
170 		memcpy(buf + totlen, zb.outbuf, outlen);
171 		totlen += outlen;
172 		i++;
173 	} while (strchr(zb.outbuf, '\0') == NULL);
174 
175 	err = parse_object_header(obj, buf, totlen);
176 done:
177 	got_inflate_end(&zb);
178 	return err;
179 }
180 
181 static const struct got_error *
182 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
183 {
184 	const struct got_error *err = NULL;
185 	char hex[SHA1_DIGEST_STRING_LENGTH];
186 	char *path_objects = got_repo_get_path_objects(repo);
187 
188 	if (path_objects == NULL)
189 		return got_error(GOT_ERR_NO_MEM);
190 
191 	got_object_id_str(id, hex, sizeof(hex));
192 
193 	if (asprintf(path, "%s/%.2x/%s", path_objects,
194 	    id->sha1[0], hex + 2) == -1)
195 		err = got_error(GOT_ERR_NO_MEM);
196 
197 	free(path_objects);
198 	return err;
199 }
200 
201 static const struct got_error *
202 open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
203 {
204 	const struct got_error *err = NULL;
205 	char *path;
206 
207 	err = object_path(&path, &obj->id, repo);
208 	if (err)
209 		return err;
210 	*f = fopen(path, "rb");
211 	if (*f == NULL) {
212 		err = got_error_from_errno();
213 		goto done;
214 	}
215 done:
216 	free(path);
217 	return err;
218 }
219 
220 const struct got_error *
221 got_object_open(struct got_object **obj, struct got_repository *repo,
222     struct got_object_id *id)
223 {
224 	const struct got_error *err = NULL;
225 	char *path;
226 	FILE *f;
227 
228 	err = object_path(&path, id, repo);
229 	if (err)
230 		return err;
231 
232 	f = fopen(path, "rb");
233 	if (f == NULL) {
234 		if (errno != ENOENT) {
235 			err = got_error_from_errno();
236 			goto done;
237 		}
238 		err = got_packfile_open_object(obj, id, repo);
239 		if (err)
240 			goto done;
241 		if (*obj == NULL)
242 			err = got_error(GOT_ERR_NO_OBJ);
243 	} else {
244 		err = read_object_header(obj, repo, f);
245 		if (err)
246 			goto done;
247 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
248 	}
249 done:
250 	free(path);
251 	if (err && f)
252 		fclose(f);
253 	return err;
254 
255 }
256 
257 void
258 got_object_close(struct got_object *obj)
259 {
260 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
261 		struct got_delta *delta;
262 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
263 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
264 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
265 			got_delta_close(delta);
266 		}
267 	}
268 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
269 		free(obj->path_packfile);
270 	free(obj);
271 }
272 
273 static int
274 commit_object_valid(struct got_commit_object *commit)
275 {
276 	int i;
277 	int n;
278 
279 	if (commit == NULL)
280 		return 0;
281 
282 	n = 0;
283 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
284 		if (commit->tree_id.sha1[i] == 0)
285 			n++;
286 	}
287 	if (n == SHA1_DIGEST_LENGTH)
288 		return 0;
289 
290 	return 1;
291 }
292 
293 static const struct got_error *
294 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
295 {
296 	const struct got_error *err = NULL;
297 	char *s = buf;
298 	size_t tlen;
299 	ssize_t remain = (ssize_t)len;
300  
301 	*commit = calloc(1, sizeof(**commit));
302 	if (*commit == NULL)
303 		return got_error(GOT_ERR_NO_MEM);
304 
305 	SIMPLEQ_INIT(&(*commit)->parent_ids);
306 
307 	tlen = strlen(GOT_COMMIT_TAG_TREE);
308 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
309 		remain -= tlen;
310 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
311 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
312 			goto done;
313 		}
314 		s += tlen;
315 		if (!got_parse_sha1_digest((*commit)->tree_id.sha1, s)) {
316 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
317 			goto done;
318 		}
319 		remain -= SHA1_DIGEST_STRING_LENGTH;
320 		s += SHA1_DIGEST_STRING_LENGTH;
321 	} else {
322 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
323 		goto done;
324 	}
325 
326 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
327 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
328 		struct got_parent_id *pid;
329 
330 		remain -= tlen;
331 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
332 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
333 			goto done;
334 		}	
335 
336 		pid = calloc(1, sizeof(*pid));
337 		if (pid == NULL) {
338 			err = got_error(GOT_ERR_NO_MEM);
339 			goto done;
340 		}
341 		s += tlen;
342 		if (!got_parse_sha1_digest(pid->id.sha1, s)) {
343 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
344 			goto done;
345 		}
346 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
347 		(*commit)->nparents++;
348 
349 		remain -= SHA1_DIGEST_STRING_LENGTH;
350 		s += SHA1_DIGEST_STRING_LENGTH;
351 	}
352 
353 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
354 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
355 		char *p;
356 
357 		remain -= tlen;
358 		if (remain <= 0) {
359 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
360 			goto done;
361 		}
362 		s += tlen;
363 		p = strchr(s, '\n');
364 		if (p == NULL) {
365 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
366 			goto done;
367 		}
368 		*p = '\0';
369 		(*commit)->author = strdup(s);
370 		if ((*commit)->author == NULL) {
371 			err = got_error(GOT_ERR_NO_MEM);
372 			goto done;
373 		}
374 		s += strlen((*commit)->author) + 1;
375 		remain -= strlen((*commit)->author) + 1;
376 	}
377 
378 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
379 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
380 		char *p;
381 
382 		remain -= tlen;
383 		if (remain <= 0) {
384 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
385 			goto done;
386 		}
387 		s += tlen;
388 		p = strchr(s, '\n');
389 		if (p == NULL) {
390 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
391 			goto done;
392 		}
393 		*p = '\0';
394 		(*commit)->committer = strdup(s);
395 		if ((*commit)->committer == NULL) {
396 			err = got_error(GOT_ERR_NO_MEM);
397 			goto done;
398 		}
399 		s += strlen((*commit)->committer) + 1;
400 		remain -= strlen((*commit)->committer) + 1;
401 	}
402 
403 	(*commit)->logmsg = strndup(s, remain);
404 	if ((*commit)->logmsg == NULL) {
405 		err = got_error(GOT_ERR_NO_MEM);
406 		goto done;
407 	}
408 done:
409 	if (err)
410 		got_object_commit_close(*commit);
411 	return err;
412 }
413 
414 static void
415 tree_entry_close(struct got_tree_entry *te)
416 {
417 	free(te->name);
418 	free(te);
419 }
420 
421 static const struct got_error *
422 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
423     size_t maxlen)
424 {
425 	char *p = buf, *space;
426 	const struct got_error *err = NULL;
427 	char hex[SHA1_DIGEST_STRING_LENGTH];
428 
429 	*te = calloc(1, sizeof(**te));
430 	if (*te == NULL)
431 		return got_error(GOT_ERR_NO_MEM);
432 
433 	*elen = strlen(buf) + 1;
434 	if (*elen > maxlen) {
435 		free(*te);
436 		return got_error(GOT_ERR_BAD_OBJ_DATA);
437 	}
438 
439 	space = strchr(buf, ' ');
440 	if (space == NULL) {
441 		free(*te);
442 		return got_error(GOT_ERR_BAD_OBJ_DATA);
443 	}
444 	while (*p != ' ') {
445 		if (*p < '0' && *p > '7') {
446 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
447 			goto done;
448 		}
449 		(*te)->mode <<= 3;
450 		(*te)->mode |= *p - '0';
451 		p++;
452 	}
453 
454 	(*te)->name = strdup(space + 1);
455 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
456 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
457 		goto done;
458 	}
459 	buf += strlen(buf) + 1;
460 	memcpy((*te)->id.sha1, buf, SHA1_DIGEST_LENGTH);
461 	*elen += SHA1_DIGEST_LENGTH;
462 done:
463 	if (err)
464 		tree_entry_close(*te);
465 	return err;
466 }
467 
468 static const struct got_error *
469 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
470     char *buf, size_t len)
471 {
472 	const struct got_error *err;
473 	size_t remain = len;
474 	int nentries;
475 
476 	*tree = calloc(1, sizeof(**tree));
477 	if (*tree == NULL)
478 		return got_error(GOT_ERR_NO_MEM);
479 
480 	SIMPLEQ_INIT(&(*tree)->entries);
481 
482 	while (remain > 0) {
483 		struct got_tree_entry *te;
484 		size_t elen;
485 
486 		err = parse_tree_entry(&te, &elen, buf, remain);
487 		if (err)
488 			return err;
489 		(*tree)->nentries++;
490 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
491 		buf += elen;
492 		remain -= elen;
493 	}
494 
495 	if (remain != 0) {
496 		got_object_tree_close(*tree);
497 		return got_error(GOT_ERR_BAD_OBJ_DATA);
498 	}
499 
500 	return NULL;
501 }
502 
503 static const struct got_error *
504 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
505 {
506 	const struct got_error *err = NULL;
507 	static const size_t blocksize = 512;
508 	size_t n, total, remain;
509 	uint8_t *buf;
510 
511 	*outbuf = NULL;
512 	*outlen = 0;
513 
514 	buf = calloc(1, blocksize);
515 	if (buf == NULL)
516 		return got_error(GOT_ERR_NO_MEM);
517 
518 	remain = blocksize;
519 	total = 0;
520 	while (1) {
521 		if (remain == 0) {
522 			uint8_t *newbuf;
523 			newbuf = reallocarray(buf, 1, total + blocksize);
524 			if (newbuf == NULL) {
525 				err = got_error(GOT_ERR_NO_MEM);
526 				goto done;
527 			}
528 			buf = newbuf;
529 			remain += blocksize;
530 		}
531 		n = fread(buf, 1, remain, f);
532 		if (n == 0) {
533 			if (ferror(f)) {
534 				err = got_ferror(f, GOT_ERR_IO);
535 				goto done;
536 			}
537 			break; /* EOF */
538 		}
539 		remain -= n;
540 		total += n;
541 	};
542 
543 done:
544 	if (err == NULL) {
545 		*outbuf = buf;
546 		*outlen = total;
547 	} else
548 		free(buf);
549 	return err;
550 }
551 
552 static const struct got_error *
553 read_commit_object(struct got_commit_object **commit,
554     struct got_repository *repo, struct got_object *obj, FILE *f)
555 {
556 	const struct got_error *err = NULL;
557 	size_t len;
558 	uint8_t *p;
559 	int i, ret;
560 
561 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
562 		err = read_to_mem(&p, &len, f);
563 	else
564 		err = got_inflate_to_mem(&p, &len, f);
565 	if (err)
566 		return err;
567 
568 	if (len < obj->hdrlen + obj->size) {
569 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
570 		goto done;
571 	}
572 
573 	/* Skip object header. */
574 	len -= obj->hdrlen;
575 	err = parse_commit_object(commit, p + obj->hdrlen, len);
576 	free(p);
577 done:
578 	return err;
579 }
580 
581 const struct got_error *
582 got_object_commit_open(struct got_commit_object **commit,
583     struct got_repository *repo, struct got_object *obj)
584 {
585 	const struct got_error *err = NULL;
586 	FILE *f;
587 
588 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
589 		return got_error(GOT_ERR_OBJ_TYPE);
590 
591 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
592 		err = got_packfile_extract_object(&f, obj, repo);
593 	else
594 		err = open_loose_object(&f, obj, repo);
595 	if (err)
596 		return err;
597 
598 	err = read_commit_object(commit, repo, obj, f);
599 	fclose(f);
600 	return err;
601 }
602 
603 void
604 got_object_commit_close(struct got_commit_object *commit)
605 {
606 	struct got_parent_id *pid;
607 
608 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
609 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
610 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
611 		free(pid);
612 	}
613 
614 	free(commit->author);
615 	free(commit->committer);
616 	free(commit->logmsg);
617 	free(commit);
618 }
619 
620 static const struct got_error *
621 read_tree_object(struct got_tree_object **tree,
622     struct got_repository *repo, struct got_object *obj, FILE *f)
623 {
624 	const struct got_error *err = NULL;
625 	size_t len;
626 	uint8_t *p;
627 	int i, ret;
628 
629 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
630 		err = read_to_mem(&p, &len, f);
631 	else
632 		err = got_inflate_to_mem(&p, &len, f);
633 	if (err)
634 		return err;
635 
636 	if (len < obj->hdrlen + obj->size) {
637 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
638 		goto done;
639 	}
640 
641 	/* Skip object header. */
642 	len -= obj->hdrlen;
643 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
644 	free(p);
645 done:
646 	return err;
647 }
648 
649 const struct got_error *
650 got_object_tree_open(struct got_tree_object **tree,
651     struct got_repository *repo, struct got_object *obj)
652 {
653 	const struct got_error *err = NULL;
654 	FILE *f;
655 
656 	if (obj->type != GOT_OBJ_TYPE_TREE)
657 		return got_error(GOT_ERR_OBJ_TYPE);
658 
659 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
660 		err = got_packfile_extract_object(&f, obj, repo);
661 	else
662 		err = open_loose_object(&f, obj, repo);
663 	if (err)
664 		return err;
665 
666 	err = read_tree_object(tree, repo, obj, f);
667 	fclose(f);
668 	return err;
669 }
670 
671 void
672 got_object_tree_close(struct got_tree_object *tree)
673 {
674 	struct got_tree_entry *te;
675 
676 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
677 		te = SIMPLEQ_FIRST(&tree->entries);
678 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
679 		tree_entry_close(te);
680 	}
681 
682 	free(tree);
683 }
684 
685 const struct got_error *
686 got_object_blob_open(struct got_blob_object **blob,
687     struct got_repository *repo, struct got_object *obj, size_t blocksize)
688 {
689 	const struct got_error *err = NULL;
690 
691 	if (obj->type != GOT_OBJ_TYPE_BLOB)
692 		return got_error(GOT_ERR_OBJ_TYPE);
693 
694 	if (blocksize < obj->hdrlen)
695 		return got_error(GOT_ERR_NO_SPACE);
696 
697 	*blob = calloc(1, sizeof(**blob));
698 	if (*blob == NULL)
699 		return got_error(GOT_ERR_NO_MEM);
700 
701 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
702 		(*blob)->read_buf = calloc(1, blocksize);
703 		if ((*blob)->read_buf == NULL)
704 			return got_error(GOT_ERR_NO_MEM);
705 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
706 		if (err)
707 			return err;
708 	} else {
709 		err = open_loose_object(&((*blob)->f), obj, repo);
710 		if (err) {
711 			free(*blob);
712 			return err;
713 		}
714 
715 		err = got_inflate_init(&(*blob)->zb, blocksize);
716 		if (err != NULL) {
717 			fclose((*blob)->f);
718 			free(*blob);
719 			return err;
720 		}
721 
722 		(*blob)->read_buf = (*blob)->zb.outbuf;
723 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
724 	}
725 
726 	(*blob)->hdrlen = obj->hdrlen;
727 	(*blob)->blocksize = blocksize;
728 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
729 
730 	return err;
731 }
732 
733 void
734 got_object_blob_close(struct got_blob_object *blob)
735 {
736 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
737 		got_inflate_end(&blob->zb);
738 	else
739 		free(blob->read_buf);
740 	fclose(blob->f);
741 	free(blob);
742 }
743 
744 const struct got_error *
745 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
746 {
747 	size_t n;
748 
749 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
750 		return got_inflate_read(&blob->zb, blob->f, outlenp);
751 
752 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
753 	if (n == 0 && ferror(blob->f))
754 		return got_ferror(blob->f, GOT_ERR_IO);
755 	*outlenp = n;
756 	return NULL;
757 }