Game of Trees Repos

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Date:: Mon Feb 12 21:13:27 2018 UTC
Message:: make struct got_object_id opaque
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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 "delta.h"
34 #include "pack.h"
35 #include "zb.h"
36 #include "object.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 const struct got_error *
62 got_parse_object_id(struct got_object_id **id, const char *buf)
63 {
64 	*id = calloc(1, sizeof(**id));
65 	if (*id == NULL)
66 		return got_error(GOT_ERR_NO_MEM);
67 	if (!got_parse_sha1_digest((*id)->sha1, buf)) {
68 		free(*id);
69 		*id = NULL;
70 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
71 	}
72 	return NULL;
73 }
74 
75 
76 int
77 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
78 {
79 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
80 }
81 
82 int
83 got_object_get_type(struct got_object *obj)
84 {
85 	switch (obj->type) {
86 	case GOT_OBJ_TYPE_COMMIT:
87 	case GOT_OBJ_TYPE_TREE:
88 	case GOT_OBJ_TYPE_BLOB:
89 	case GOT_OBJ_TYPE_TAG:
90 		return obj->type;
91 	default:
92 		abort();
93 		break;
94 	}
95 
96 	/* not reached */
97 	return 0;
98 }
99 
100 static const struct got_error *
101 parse_object_header(struct got_object **obj, char *buf, size_t len)
102 {
103 	const char *obj_tags[] = {
104 		GOT_OBJ_TAG_COMMIT,
105 		GOT_OBJ_TAG_TREE,
106 		GOT_OBJ_TAG_BLOB
107 	};
108 	const int obj_types[] = {
109 		GOT_OBJ_TYPE_COMMIT,
110 		GOT_OBJ_TYPE_TREE,
111 		GOT_OBJ_TYPE_BLOB,
112 	};
113 	int type = 0;
114 	size_t size = 0, hdrlen = 0;
115 	int i;
116 	char *p = strchr(buf, '\0');
117 
118 	if (p == NULL)
119 		return got_error(GOT_ERR_BAD_OBJ_HDR);
120 
121 	hdrlen = strlen(buf) + 1 /* '\0' */;
122 
123 	for (i = 0; i < nitems(obj_tags); i++) {
124 		const char *tag = obj_tags[i];
125 		size_t tlen = strlen(tag);
126 		const char *errstr;
127 
128 		if (strncmp(buf, tag, tlen) != 0)
129 			continue;
130 
131 		type = obj_types[i];
132 		if (len <= tlen)
133 			return got_error(GOT_ERR_BAD_OBJ_HDR);
134 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
135 		if (errstr != NULL)
136 			return got_error(GOT_ERR_BAD_OBJ_HDR);
137 		break;
138 	}
139 
140 	if (type == 0)
141 		return got_error(GOT_ERR_BAD_OBJ_HDR);
142 
143 	*obj = calloc(1, sizeof(**obj));
144 	if (*obj == NULL)
145 		return got_error(GOT_ERR_NO_MEM);
146 	(*obj)->type = type;
147 	(*obj)->hdrlen = hdrlen;
148 	(*obj)->size = size;
149 	return NULL;
150 }
151 
152 static const struct got_error *
153 read_object_header(struct got_object **obj, struct got_repository *repo,
154     FILE *f)
155 {
156 	const struct got_error *err;
157 	struct got_zstream_buf zb;
158 	char *buf;
159 	size_t len;
160 	const size_t zbsize = 64;
161 	size_t outlen, totlen;
162 	int i, ret;
163 
164 	buf = calloc(zbsize, sizeof(char));
165 	if (buf == NULL)
166 		return got_error(GOT_ERR_NO_MEM);
167 
168 	err = got_inflate_init(&zb, zbsize);
169 	if (err)
170 		return err;
171 
172 	i = 0;
173 	totlen = 0;
174 	do {
175 		err = got_inflate_read(&zb, f, &outlen);
176 		if (err)
177 			goto done;
178 		if (strchr(zb.outbuf, '\0') == NULL) {
179 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
180 			if (buf == NULL) {
181 				err = got_error(GOT_ERR_NO_MEM);
182 				goto done;
183 			}
184 		}
185 		memcpy(buf + totlen, zb.outbuf, outlen);
186 		totlen += outlen;
187 		i++;
188 	} while (strchr(zb.outbuf, '\0') == NULL);
189 
190 	err = parse_object_header(obj, buf, totlen);
191 done:
192 	got_inflate_end(&zb);
193 	return err;
194 }
195 
196 static const struct got_error *
197 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
198 {
199 	const struct got_error *err = NULL;
200 	char hex[SHA1_DIGEST_STRING_LENGTH];
201 	char *path_objects = got_repo_get_path_objects(repo);
202 
203 	if (path_objects == NULL)
204 		return got_error(GOT_ERR_NO_MEM);
205 
206 	got_object_id_str(id, hex, sizeof(hex));
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(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 void
273 got_object_close(struct got_object *obj)
274 {
275 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
276 		struct got_delta *delta;
277 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
278 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
279 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
280 			got_delta_close(delta);
281 		}
282 	}
283 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
284 		free(obj->path_packfile);
285 	free(obj);
286 }
287 
288 static int
289 commit_object_valid(struct got_commit_object *commit)
290 {
291 	int i;
292 	int n;
293 
294 	if (commit == NULL)
295 		return 0;
296 
297 	n = 0;
298 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
299 		if (commit->tree_id->sha1[i] == 0)
300 			n++;
301 	}
302 	if (n == SHA1_DIGEST_LENGTH)
303 		return 0;
304 
305 	return 1;
306 }
307 
308 static const struct got_error *
309 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
310 {
311 	const struct got_error *err = NULL;
312 	char *s = buf;
313 	size_t tlen;
314 	ssize_t remain = (ssize_t)len;
315  
316 	*commit = calloc(1, sizeof(**commit));
317 	if (*commit == NULL)
318 		return got_error(GOT_ERR_NO_MEM);
319 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
320 	if ((*commit)->tree_id == NULL) {
321 		free(*commit);
322 		*commit = NULL;
323 		return got_error(GOT_ERR_NO_MEM);
324 	}
325 
326 	SIMPLEQ_INIT(&(*commit)->parent_ids);
327 
328 	tlen = strlen(GOT_COMMIT_TAG_TREE);
329 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
330 		remain -= tlen;
331 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
332 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
333 			goto done;
334 		}
335 		s += tlen;
336 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
337 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
338 			goto done;
339 		}
340 		remain -= SHA1_DIGEST_STRING_LENGTH;
341 		s += SHA1_DIGEST_STRING_LENGTH;
342 	} else {
343 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
344 		goto done;
345 	}
346 
347 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
348 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
349 		struct got_parent_id *pid;
350 
351 		remain -= tlen;
352 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
353 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
354 			goto done;
355 		}	
356 
357 		pid = calloc(1, sizeof(*pid));
358 		if (pid == NULL) {
359 			err = got_error(GOT_ERR_NO_MEM);
360 			goto done;
361 		}
362 		pid->id = calloc(1, sizeof(*pid->id));
363 		if (pid->id == NULL) {
364 			free(pid);
365 			err = got_error(GOT_ERR_NO_MEM);
366 			goto done;
367 		}
368 		s += tlen;
369 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
370 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
371 			free(pid->id);
372 			free(pid);
373 			goto done;
374 		}
375 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
376 		(*commit)->nparents++;
377 
378 		remain -= SHA1_DIGEST_STRING_LENGTH;
379 		s += SHA1_DIGEST_STRING_LENGTH;
380 	}
381 
382 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
383 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
384 		char *p;
385 
386 		remain -= tlen;
387 		if (remain <= 0) {
388 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
389 			goto done;
390 		}
391 		s += tlen;
392 		p = strchr(s, '\n');
393 		if (p == NULL) {
394 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
395 			goto done;
396 		}
397 		*p = '\0';
398 		(*commit)->author = strdup(s);
399 		if ((*commit)->author == NULL) {
400 			err = got_error(GOT_ERR_NO_MEM);
401 			goto done;
402 		}
403 		s += strlen((*commit)->author) + 1;
404 		remain -= strlen((*commit)->author) + 1;
405 	}
406 
407 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
408 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
409 		char *p;
410 
411 		remain -= tlen;
412 		if (remain <= 0) {
413 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
414 			goto done;
415 		}
416 		s += tlen;
417 		p = strchr(s, '\n');
418 		if (p == NULL) {
419 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
420 			goto done;
421 		}
422 		*p = '\0';
423 		(*commit)->committer = strdup(s);
424 		if ((*commit)->committer == NULL) {
425 			err = got_error(GOT_ERR_NO_MEM);
426 			goto done;
427 		}
428 		s += strlen((*commit)->committer) + 1;
429 		remain -= strlen((*commit)->committer) + 1;
430 	}
431 
432 	(*commit)->logmsg = strndup(s, remain);
433 	if ((*commit)->logmsg == NULL) {
434 		err = got_error(GOT_ERR_NO_MEM);
435 		goto done;
436 	}
437 done:
438 	if (err) {
439 		got_object_commit_close(*commit);
440 		*commit = NULL;
441 	}
442 	return err;
443 }
444 
445 static void
446 tree_entry_close(struct got_tree_entry *te)
447 {
448 	free(te->id);
449 	free(te->name);
450 	free(te);
451 }
452 
453 static const struct got_error *
454 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
455     size_t maxlen)
456 {
457 	char *p = buf, *space;
458 	const struct got_error *err = NULL;
459 	char hex[SHA1_DIGEST_STRING_LENGTH];
460 
461 	*te = calloc(1, sizeof(**te));
462 	if (*te == NULL)
463 		return got_error(GOT_ERR_NO_MEM);
464 
465 	(*te)->id = calloc(1, sizeof(*(*te)->id));
466 	if ((*te)->id == NULL) {
467 		free(*te);
468 		*te = NULL;
469 		return got_error(GOT_ERR_NO_MEM);
470 	}
471 
472 	*elen = strlen(buf) + 1;
473 	if (*elen > maxlen) {
474 		free(*te);
475 		*te = NULL;
476 		return got_error(GOT_ERR_BAD_OBJ_DATA);
477 	}
478 
479 	space = strchr(buf, ' ');
480 	if (space == NULL) {
481 		free(*te);
482 		*te = NULL;
483 		return got_error(GOT_ERR_BAD_OBJ_DATA);
484 	}
485 	while (*p != ' ') {
486 		if (*p < '0' && *p > '7') {
487 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
488 			goto done;
489 		}
490 		(*te)->mode <<= 3;
491 		(*te)->mode |= *p - '0';
492 		p++;
493 	}
494 
495 	(*te)->name = strdup(space + 1);
496 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
497 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
498 		goto done;
499 	}
500 	buf += strlen(buf) + 1;
501 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
502 	*elen += SHA1_DIGEST_LENGTH;
503 done:
504 	if (err) {
505 		tree_entry_close(*te);
506 		*te = NULL;
507 	}
508 	return err;
509 }
510 
511 static const struct got_error *
512 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
513     char *buf, size_t len)
514 {
515 	const struct got_error *err;
516 	size_t remain = len;
517 	int nentries;
518 
519 	*tree = calloc(1, sizeof(**tree));
520 	if (*tree == NULL)
521 		return got_error(GOT_ERR_NO_MEM);
522 
523 	SIMPLEQ_INIT(&(*tree)->entries);
524 
525 	while (remain > 0) {
526 		struct got_tree_entry *te;
527 		size_t elen;
528 
529 		err = parse_tree_entry(&te, &elen, buf, remain);
530 		if (err)
531 			return err;
532 		(*tree)->nentries++;
533 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
534 		buf += elen;
535 		remain -= elen;
536 	}
537 
538 	if (remain != 0) {
539 		got_object_tree_close(*tree);
540 		return got_error(GOT_ERR_BAD_OBJ_DATA);
541 	}
542 
543 	return NULL;
544 }
545 
546 static const struct got_error *
547 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
548 {
549 	const struct got_error *err = NULL;
550 	static const size_t blocksize = 512;
551 	size_t n, total, remain;
552 	uint8_t *buf;
553 
554 	*outbuf = NULL;
555 	*outlen = 0;
556 
557 	buf = calloc(1, blocksize);
558 	if (buf == NULL)
559 		return got_error(GOT_ERR_NO_MEM);
560 
561 	remain = blocksize;
562 	total = 0;
563 	while (1) {
564 		if (remain == 0) {
565 			uint8_t *newbuf;
566 			newbuf = reallocarray(buf, 1, total + blocksize);
567 			if (newbuf == NULL) {
568 				err = got_error(GOT_ERR_NO_MEM);
569 				goto done;
570 			}
571 			buf = newbuf;
572 			remain += blocksize;
573 		}
574 		n = fread(buf, 1, remain, f);
575 		if (n == 0) {
576 			if (ferror(f)) {
577 				err = got_ferror(f, GOT_ERR_IO);
578 				goto done;
579 			}
580 			break; /* EOF */
581 		}
582 		remain -= n;
583 		total += n;
584 	};
585 
586 done:
587 	if (err == NULL) {
588 		*outbuf = buf;
589 		*outlen = total;
590 	} else
591 		free(buf);
592 	return err;
593 }
594 
595 static const struct got_error *
596 read_commit_object(struct got_commit_object **commit,
597     struct got_repository *repo, struct got_object *obj, FILE *f)
598 {
599 	const struct got_error *err = NULL;
600 	size_t len;
601 	uint8_t *p;
602 	int i, ret;
603 
604 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
605 		err = read_to_mem(&p, &len, f);
606 	else
607 		err = got_inflate_to_mem(&p, &len, f);
608 	if (err)
609 		return err;
610 
611 	if (len < obj->hdrlen + obj->size) {
612 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
613 		goto done;
614 	}
615 
616 	/* Skip object header. */
617 	len -= obj->hdrlen;
618 	err = parse_commit_object(commit, p + obj->hdrlen, len);
619 	free(p);
620 done:
621 	return err;
622 }
623 
624 const struct got_error *
625 got_object_commit_open(struct got_commit_object **commit,
626     struct got_repository *repo, struct got_object *obj)
627 {
628 	const struct got_error *err = NULL;
629 	FILE *f;
630 
631 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
632 		return got_error(GOT_ERR_OBJ_TYPE);
633 
634 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
635 		err = got_packfile_extract_object(&f, obj, repo);
636 	else
637 		err = open_loose_object(&f, obj, repo);
638 	if (err)
639 		return err;
640 
641 	err = read_commit_object(commit, repo, obj, f);
642 	fclose(f);
643 	return err;
644 }
645 
646 void
647 got_object_commit_close(struct got_commit_object *commit)
648 {
649 	struct got_parent_id *pid;
650 
651 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
652 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
653 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
654 		free(pid->id);
655 		free(pid);
656 	}
657 
658 	free(commit->tree_id);
659 	free(commit->author);
660 	free(commit->committer);
661 	free(commit->logmsg);
662 	free(commit);
663 }
664 
665 static const struct got_error *
666 read_tree_object(struct got_tree_object **tree,
667     struct got_repository *repo, struct got_object *obj, FILE *f)
668 {
669 	const struct got_error *err = NULL;
670 	size_t len;
671 	uint8_t *p;
672 	int i, ret;
673 
674 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
675 		err = read_to_mem(&p, &len, f);
676 	else
677 		err = got_inflate_to_mem(&p, &len, f);
678 	if (err)
679 		return err;
680 
681 	if (len < obj->hdrlen + obj->size) {
682 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
683 		goto done;
684 	}
685 
686 	/* Skip object header. */
687 	len -= obj->hdrlen;
688 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
689 	free(p);
690 done:
691 	return err;
692 }
693 
694 const struct got_error *
695 got_object_tree_open(struct got_tree_object **tree,
696     struct got_repository *repo, struct got_object *obj)
697 {
698 	const struct got_error *err = NULL;
699 	FILE *f;
700 
701 	if (obj->type != GOT_OBJ_TYPE_TREE)
702 		return got_error(GOT_ERR_OBJ_TYPE);
703 
704 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
705 		err = got_packfile_extract_object(&f, obj, repo);
706 	else
707 		err = open_loose_object(&f, obj, repo);
708 	if (err)
709 		return err;
710 
711 	err = read_tree_object(tree, repo, obj, f);
712 	fclose(f);
713 	return err;
714 }
715 
716 void
717 got_object_tree_close(struct got_tree_object *tree)
718 {
719 	struct got_tree_entry *te;
720 
721 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
722 		te = SIMPLEQ_FIRST(&tree->entries);
723 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
724 		tree_entry_close(te);
725 	}
726 
727 	free(tree);
728 }
729 
730 const struct got_error *
731 got_object_blob_open(struct got_blob_object **blob,
732     struct got_repository *repo, struct got_object *obj, size_t blocksize)
733 {
734 	const struct got_error *err = NULL;
735 
736 	if (obj->type != GOT_OBJ_TYPE_BLOB)
737 		return got_error(GOT_ERR_OBJ_TYPE);
738 
739 	if (blocksize < obj->hdrlen)
740 		return got_error(GOT_ERR_NO_SPACE);
741 
742 	*blob = calloc(1, sizeof(**blob));
743 	if (*blob == NULL)
744 		return got_error(GOT_ERR_NO_MEM);
745 
746 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
747 		(*blob)->read_buf = calloc(1, blocksize);
748 		if ((*blob)->read_buf == NULL)
749 			return got_error(GOT_ERR_NO_MEM);
750 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
751 		if (err)
752 			return err;
753 	} else {
754 		err = open_loose_object(&((*blob)->f), obj, repo);
755 		if (err) {
756 			free(*blob);
757 			return err;
758 		}
759 
760 		err = got_inflate_init(&(*blob)->zb, blocksize);
761 		if (err != NULL) {
762 			fclose((*blob)->f);
763 			free(*blob);
764 			return err;
765 		}
766 
767 		(*blob)->read_buf = (*blob)->zb.outbuf;
768 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
769 	}
770 
771 	(*blob)->hdrlen = obj->hdrlen;
772 	(*blob)->blocksize = blocksize;
773 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
774 
775 	return err;
776 }
777 
778 void
779 got_object_blob_close(struct got_blob_object *blob)
780 {
781 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
782 		got_inflate_end(&blob->zb);
783 	else
784 		free(blob->read_buf);
785 	fclose(blob->f);
786 	free(blob);
787 }
788 
789 char *
790 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
791 {
792 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
793 }
794 
795 size_t
796 got_object_blob_get_hdrlen(struct got_blob_object *blob)
797 {
798 	return blob->hdrlen;
799 }
800 
801 const uint8_t *
802 got_object_blob_get_read_buf(struct got_blob_object *blob)
803 {
804 	return blob->read_buf;
805 }
806 
807 const struct got_error *
808 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
809 {
810 	size_t n;
811 
812 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
813 		return got_inflate_read(&blob->zb, blob->f, outlenp);
814 
815 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
816 	if (n == 0 && ferror(blob->f))
817 		return got_ferror(blob->f, GOT_ERR_IO);
818 	*outlenp = n;
819 	return NULL;
820 }