Gotweb

Blob

Date:: Sun Apr 1 16:17:18 2018 UTC
Message:: add the ability to start the log at a particular commit
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 struct got_object_id *
93 got_object_get_id(struct got_object *obj)
94 {
95 	return got_object_id_dup(&obj->id);
96 }
97 
98 int
99 got_object_get_type(struct got_object *obj)
100 {
101 	switch (obj->type) {
102 	case GOT_OBJ_TYPE_COMMIT:
103 	case GOT_OBJ_TYPE_TREE:
104 	case GOT_OBJ_TYPE_BLOB:
105 	case GOT_OBJ_TYPE_TAG:
106 		return obj->type;
107 	default:
108 		abort();
109 		break;
110 	}
111 
112 	/* not reached */
113 	return 0;
114 }
115 
116 static const struct got_error *
117 parse_object_header(struct got_object **obj, char *buf, size_t len)
118 {
119 	const char *obj_tags[] = {
120 		GOT_OBJ_TAG_COMMIT,
121 		GOT_OBJ_TAG_TREE,
122 		GOT_OBJ_TAG_BLOB
123 	};
124 	const int obj_types[] = {
125 		GOT_OBJ_TYPE_COMMIT,
126 		GOT_OBJ_TYPE_TREE,
127 		GOT_OBJ_TYPE_BLOB,
128 	};
129 	int type = 0;
130 	size_t size = 0, hdrlen = 0;
131 	int i;
132 	char *p = strchr(buf, '\0');
133 
134 	if (p == NULL)
135 		return got_error(GOT_ERR_BAD_OBJ_HDR);
136 
137 	hdrlen = strlen(buf) + 1 /* '\0' */;
138 
139 	for (i = 0; i < nitems(obj_tags); i++) {
140 		const char *tag = obj_tags[i];
141 		size_t tlen = strlen(tag);
142 		const char *errstr;
143 
144 		if (strncmp(buf, tag, tlen) != 0)
145 			continue;
146 
147 		type = obj_types[i];
148 		if (len <= tlen)
149 			return got_error(GOT_ERR_BAD_OBJ_HDR);
150 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
151 		if (errstr != NULL)
152 			return got_error(GOT_ERR_BAD_OBJ_HDR);
153 		break;
154 	}
155 
156 	if (type == 0)
157 		return got_error(GOT_ERR_BAD_OBJ_HDR);
158 
159 	*obj = calloc(1, sizeof(**obj));
160 	if (*obj == NULL)
161 		return got_error_from_errno();
162 	(*obj)->type = type;
163 	(*obj)->hdrlen = hdrlen;
164 	(*obj)->size = size;
165 	return NULL;
166 }
167 
168 static const struct got_error *
169 read_object_header(struct got_object **obj, struct got_repository *repo,
170     FILE *f)
171 {
172 	const struct got_error *err;
173 	struct got_zstream_buf zb;
174 	char *buf;
175 	const size_t zbsize = 64;
176 	size_t outlen, totlen;
177 	int i;
178 
179 	buf = calloc(zbsize, sizeof(char));
180 	if (buf == NULL)
181 		return got_error_from_errno();
182 
183 	err = got_inflate_init(&zb, NULL, zbsize);
184 	if (err)
185 		return err;
186 
187 	i = 0;
188 	totlen = 0;
189 	do {
190 		err = got_inflate_read(&zb, f, &outlen);
191 		if (err)
192 			goto done;
193 		if (strchr(zb.outbuf, '\0') == NULL) {
194 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
195 			if (buf == NULL) {
196 				err = got_error_from_errno();
197 				goto done;
198 			}
199 		}
200 		memcpy(buf + totlen, zb.outbuf, outlen);
201 		totlen += outlen;
202 		i++;
203 	} while (strchr(zb.outbuf, '\0') == NULL);
204 
205 	err = parse_object_header(obj, buf, totlen);
206 done:
207 	got_inflate_end(&zb);
208 	return err;
209 }
210 
211 static const struct got_error *
212 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
213 {
214 	const struct got_error *err = NULL;
215 	char *hex;
216 	char *path_objects = got_repo_get_path_objects(repo);
217 
218 	if (path_objects == NULL)
219 		return got_error_from_errno();
220 
221 	err = got_object_id_str(&hex, id);
222 	if (err)
223 		return err;
224 
225 	if (asprintf(path, "%s/%.2x/%s", path_objects,
226 	    id->sha1[0], hex + 2) == -1)
227 		err = got_error_from_errno();
228 
229 	free(hex);
230 	free(path_objects);
231 	return err;
232 }
233 
234 static const struct got_error *
235 open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
236 {
237 	const struct got_error *err = NULL;
238 	char *path;
239 
240 	err = object_path(&path, &obj->id, repo);
241 	if (err)
242 		return err;
243 	*f = fopen(path, "rb");
244 	if (*f == NULL) {
245 		err = got_error_from_errno();
246 		goto done;
247 	}
248 done:
249 	free(path);
250 	return err;
251 }
252 
253 const struct got_error *
254 got_object_open(struct got_object **obj, struct got_repository *repo,
255     struct got_object_id *id)
256 {
257 	const struct got_error *err = NULL;
258 	char *path;
259 	FILE *f;
260 
261 	err = object_path(&path, id, repo);
262 	if (err)
263 		return err;
264 
265 	f = fopen(path, "rb");
266 	if (f == NULL) {
267 		if (errno != ENOENT) {
268 			err = got_error_from_errno();
269 			goto done;
270 		}
271 		err = got_packfile_open_object(obj, id, repo);
272 		if (err)
273 			goto done;
274 		if (*obj == NULL)
275 			err = got_error(GOT_ERR_NO_OBJ);
276 	} else {
277 		err = read_object_header(obj, repo, f);
278 		if (err)
279 			goto done;
280 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
281 	}
282 done:
283 	free(path);
284 	if (f)
285 		fclose(f);
286 	return err;
287 
288 }
289 
290 const struct got_error *
291 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
292     const char *id_str)
293 {
294 	struct got_object_id id;
295 
296 	if (!got_parse_sha1_digest(id.sha1, id_str))
297 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
298 
299 	return got_object_open(obj, repo, &id);
300 }
301 
302 void
303 got_object_close(struct got_object *obj)
304 {
305 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
306 		struct got_delta *delta;
307 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
308 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
309 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
310 			got_delta_close(delta);
311 		}
312 	}
313 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
314 		free(obj->path_packfile);
315 	free(obj);
316 }
317 
318 static const struct got_error *
319 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
320 {
321 	const struct got_error *err = NULL;
322 	char *s = buf;
323 	size_t tlen;
324 	ssize_t remain = (ssize_t)len;
325  
326 	*commit = calloc(1, sizeof(**commit));
327 	if (*commit == NULL)
328 		return got_error_from_errno();
329 	(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
330 	if ((*commit)->tree_id == NULL) {
331 		err = got_error_from_errno();
332 		free(*commit);
333 		*commit = NULL;
334 		return err;
335 	}
336 
337 	SIMPLEQ_INIT(&(*commit)->parent_ids);
338 
339 	tlen = strlen(GOT_COMMIT_TAG_TREE);
340 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
341 		remain -= tlen;
342 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
343 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
344 			goto done;
345 		}
346 		s += tlen;
347 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
348 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
349 			goto done;
350 		}
351 		remain -= SHA1_DIGEST_STRING_LENGTH;
352 		s += SHA1_DIGEST_STRING_LENGTH;
353 	} else {
354 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
355 		goto done;
356 	}
357 
358 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
359 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
360 		struct got_parent_id *pid;
361 
362 		remain -= tlen;
363 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
364 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
365 			goto done;
366 		}
367 
368 		pid = calloc(1, sizeof(*pid));
369 		if (pid == NULL) {
370 			err = got_error_from_errno();
371 			goto done;
372 		}
373 		pid->id = calloc(1, sizeof(*pid->id));
374 		if (pid->id == NULL) {
375 			err = got_error_from_errno();
376 			free(pid);
377 			goto done;
378 		}
379 		s += tlen;
380 		if (!got_parse_sha1_digest(pid->id->sha1, s)) {
381 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
382 			free(pid->id);
383 			free(pid);
384 			goto done;
385 		}
386 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
387 		(*commit)->nparents++;
388 
389 		remain -= SHA1_DIGEST_STRING_LENGTH;
390 		s += SHA1_DIGEST_STRING_LENGTH;
391 	}
392 
393 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
394 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
395 		char *p;
396 
397 		remain -= tlen;
398 		if (remain <= 0) {
399 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
400 			goto done;
401 		}
402 		s += tlen;
403 		p = strchr(s, '\n');
404 		if (p == NULL) {
405 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
406 			goto done;
407 		}
408 		*p = '\0';
409 		(*commit)->author = strdup(s);
410 		if ((*commit)->author == NULL) {
411 			err = got_error_from_errno();
412 			goto done;
413 		}
414 		s += strlen((*commit)->author) + 1;
415 		remain -= strlen((*commit)->author) + 1;
416 	}
417 
418 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
419 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
420 		char *p;
421 
422 		remain -= tlen;
423 		if (remain <= 0) {
424 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
425 			goto done;
426 		}
427 		s += tlen;
428 		p = strchr(s, '\n');
429 		if (p == NULL) {
430 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
431 			goto done;
432 		}
433 		*p = '\0';
434 		(*commit)->committer = strdup(s);
435 		if ((*commit)->committer == NULL) {
436 			err = got_error_from_errno();
437 			goto done;
438 		}
439 		s += strlen((*commit)->committer) + 1;
440 		remain -= strlen((*commit)->committer) + 1;
441 	}
442 
443 	(*commit)->logmsg = strndup(s, remain);
444 	if ((*commit)->logmsg == NULL) {
445 		err = got_error_from_errno();
446 		goto done;
447 	}
448 done:
449 	if (err) {
450 		got_object_commit_close(*commit);
451 		*commit = NULL;
452 	}
453 	return err;
454 }
455 
456 static void
457 tree_entry_close(struct got_tree_entry *te)
458 {
459 	free(te->id);
460 	free(te->name);
461 	free(te);
462 }
463 
464 static const struct got_error *
465 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
466     size_t maxlen)
467 {
468 	char *p = buf, *space;
469 	const struct got_error *err = NULL;
470 
471 	*te = calloc(1, sizeof(**te));
472 	if (*te == NULL)
473 		return got_error_from_errno();
474 
475 	(*te)->id = calloc(1, sizeof(*(*te)->id));
476 	if ((*te)->id == NULL) {
477 		err = got_error_from_errno();
478 		free(*te);
479 		*te = NULL;
480 		return err;
481 	}
482 
483 	*elen = strlen(buf) + 1;
484 	if (*elen > maxlen) {
485 		free(*te);
486 		*te = NULL;
487 		return got_error(GOT_ERR_BAD_OBJ_DATA);
488 	}
489 
490 	space = strchr(buf, ' ');
491 	if (space == NULL) {
492 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
493 		free(*te);
494 		*te = NULL;
495 		return err;
496 	}
497 	while (*p != ' ') {
498 		if (*p < '0' && *p > '7') {
499 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
500 			goto done;
501 		}
502 		(*te)->mode <<= 3;
503 		(*te)->mode |= *p - '0';
504 		p++;
505 	}
506 
507 	(*te)->name = strdup(space + 1);
508 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
509 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
510 		goto done;
511 	}
512 	buf += strlen(buf) + 1;
513 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
514 	*elen += SHA1_DIGEST_LENGTH;
515 done:
516 	if (err) {
517 		tree_entry_close(*te);
518 		*te = NULL;
519 	}
520 	return err;
521 }
522 
523 static const struct got_error *
524 parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
525     uint8_t *buf, size_t len)
526 {
527 	const struct got_error *err;
528 	size_t remain = len;
529 
530 	*tree = calloc(1, sizeof(**tree));
531 	if (*tree == NULL)
532 		return got_error_from_errno();
533 
534 	SIMPLEQ_INIT(&(*tree)->entries);
535 
536 	while (remain > 0) {
537 		struct got_tree_entry *te;
538 		size_t elen;
539 
540 		err = parse_tree_entry(&te, &elen, buf, remain);
541 		if (err)
542 			return err;
543 		(*tree)->nentries++;
544 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
545 		buf += elen;
546 		remain -= elen;
547 	}
548 
549 	if (remain != 0) {
550 		got_object_tree_close(*tree);
551 		return got_error(GOT_ERR_BAD_OBJ_DATA);
552 	}
553 
554 	return NULL;
555 }
556 
557 static const struct got_error *
558 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
559 {
560 	const struct got_error *err = NULL;
561 	static const size_t blocksize = 512;
562 	size_t n, total, remain;
563 	uint8_t *buf;
564 
565 	*outbuf = NULL;
566 	*outlen = 0;
567 
568 	buf = calloc(1, blocksize);
569 	if (buf == NULL)
570 		return got_error_from_errno();
571 
572 	remain = blocksize;
573 	total = 0;
574 	while (1) {
575 		if (remain == 0) {
576 			uint8_t *newbuf;
577 			newbuf = reallocarray(buf, 1, total + blocksize);
578 			if (newbuf == NULL) {
579 				err = got_error_from_errno();
580 				goto done;
581 			}
582 			buf = newbuf;
583 			remain += blocksize;
584 		}
585 		n = fread(buf + total, 1, remain, f);
586 		if (n == 0) {
587 			if (ferror(f)) {
588 				err = got_ferror(f, GOT_ERR_IO);
589 				goto done;
590 			}
591 			break; /* EOF */
592 		}
593 		remain -= n;
594 		total += n;
595 	};
596 
597 done:
598 	if (err == NULL) {
599 		*outbuf = buf;
600 		*outlen = total;
601 	} else
602 		free(buf);
603 	return err;
604 }
605 
606 static const struct got_error *
607 read_commit_object(struct got_commit_object **commit,
608     struct got_repository *repo, struct got_object *obj, FILE *f)
609 {
610 	const struct got_error *err = NULL;
611 	size_t len;
612 	uint8_t *p;
613 
614 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
615 		err = read_to_mem(&p, &len, f);
616 	else
617 		err = got_inflate_to_mem(&p, &len, f);
618 	if (err)
619 		return err;
620 
621 	if (len < obj->hdrlen + obj->size) {
622 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
623 		goto done;
624 	}
625 
626 	/* Skip object header. */
627 	len -= obj->hdrlen;
628 	err = parse_commit_object(commit, p + obj->hdrlen, len);
629 	free(p);
630 done:
631 	return err;
632 }
633 
634 const struct got_error *
635 got_object_commit_open(struct got_commit_object **commit,
636     struct got_repository *repo, struct got_object *obj)
637 {
638 	const struct got_error *err = NULL;
639 
640 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
641 		return got_error(GOT_ERR_OBJ_TYPE);
642 
643 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
644 		uint8_t *buf;
645 		size_t len;
646 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
647 		if (err)
648 			return err;
649 		obj->size = len;
650 		err = parse_commit_object(commit, buf, len);
651 		free(buf);
652 	} else {
653 		FILE *f;
654 		err = open_loose_object(&f, obj, repo);
655 		if (err)
656 			return err;
657 		err = read_commit_object(commit, repo, obj, f);
658 		fclose(f);
659 	}
660 	return err;
661 }
662 
663 void
664 got_object_commit_close(struct got_commit_object *commit)
665 {
666 	struct got_parent_id *pid;
667 
668 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
669 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
670 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
671 		free(pid->id);
672 		free(pid);
673 	}
674 
675 	free(commit->tree_id);
676 	free(commit->author);
677 	free(commit->committer);
678 	free(commit->logmsg);
679 	free(commit);
680 }
681 
682 static const struct got_error *
683 read_tree_object(struct got_tree_object **tree,
684     struct got_repository *repo, struct got_object *obj, FILE *f)
685 {
686 	const struct got_error *err = NULL;
687 	size_t len;
688 	uint8_t *p;
689 
690 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
691 		err = read_to_mem(&p, &len, f);
692 	else
693 		err = got_inflate_to_mem(&p, &len, f);
694 	if (err)
695 		return err;
696 
697 	if (len < obj->hdrlen + obj->size) {
698 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
699 		goto done;
700 	}
701 
702 	/* Skip object header. */
703 	len -= obj->hdrlen;
704 	err = parse_tree_object(tree, repo, p + obj->hdrlen, len);
705 	free(p);
706 done:
707 	return err;
708 }
709 
710 const struct got_error *
711 got_object_tree_open(struct got_tree_object **tree,
712     struct got_repository *repo, struct got_object *obj)
713 {
714 	const struct got_error *err = NULL;
715 
716 	if (obj->type != GOT_OBJ_TYPE_TREE)
717 		return got_error(GOT_ERR_OBJ_TYPE);
718 
719 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
720 		uint8_t *buf;
721 		size_t len;
722 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
723 		if (err)
724 			return err;
725 		obj->size = len;
726 		err = parse_tree_object(tree, repo, buf, len);
727 		free(buf);
728 	} else {
729 		FILE *f;
730 		err = open_loose_object(&f, obj, repo);
731 		if (err)
732 			return err;
733 		err = read_tree_object(tree, repo, obj, f);
734 		fclose(f);
735 	}
736 	return err;
737 }
738 
739 void
740 got_object_tree_close(struct got_tree_object *tree)
741 {
742 	struct got_tree_entry *te;
743 
744 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
745 		te = SIMPLEQ_FIRST(&tree->entries);
746 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
747 		tree_entry_close(te);
748 	}
749 
750 	free(tree);
751 }
752 
753 const struct got_error *
754 got_object_blob_open(struct got_blob_object **blob,
755     struct got_repository *repo, struct got_object *obj, size_t blocksize)
756 {
757 	const struct got_error *err = NULL;
758 
759 	if (obj->type != GOT_OBJ_TYPE_BLOB)
760 		return got_error(GOT_ERR_OBJ_TYPE);
761 
762 	if (blocksize < obj->hdrlen)
763 		return got_error(GOT_ERR_NO_SPACE);
764 
765 	*blob = calloc(1, sizeof(**blob));
766 	if (*blob == NULL)
767 		return got_error_from_errno();
768 
769 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
770 		(*blob)->read_buf = calloc(1, blocksize);
771 		if ((*blob)->read_buf == NULL) {
772 			err = got_error_from_errno();
773 			free(*blob);
774 			*blob = NULL;
775 			return err;
776 		}
777 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
778 		if (err) {
779 			free((*blob)->read_buf);
780 			free(*blob);
781 			*blob = NULL;
782 			return err;
783 		}
784 	} else {
785 		err = open_loose_object(&((*blob)->f), obj, repo);
786 		if (err) {
787 			free(*blob);
788 			*blob = NULL;
789 			return err;
790 		}
791 
792 		err = got_inflate_init(&(*blob)->zb, NULL, blocksize);
793 		if (err != NULL) {
794 			fclose((*blob)->f);
795 			free(*blob);
796 			*blob = NULL;
797 			return err;
798 		}
799 
800 		(*blob)->read_buf = (*blob)->zb.outbuf;
801 		(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
802 	}
803 
804 	(*blob)->hdrlen = obj->hdrlen;
805 	(*blob)->blocksize = blocksize;
806 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
807 
808 	return err;
809 }
810 
811 void
812 got_object_blob_close(struct got_blob_object *blob)
813 {
814 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
815 		got_inflate_end(&blob->zb);
816 	else
817 		free(blob->read_buf);
818 	fclose(blob->f);
819 	free(blob);
820 }
821 
822 char *
823 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
824 {
825 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
826 }
827 
828 size_t
829 got_object_blob_get_hdrlen(struct got_blob_object *blob)
830 {
831 	return blob->hdrlen;
832 }
833 
834 const uint8_t *
835 got_object_blob_get_read_buf(struct got_blob_object *blob)
836 {
837 	return blob->read_buf;
838 }
839 
840 const struct got_error *
841 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
842 {
843 	size_t n;
844 
845 	if (blob->flags & GOT_BLOB_F_COMPRESSED)
846 		return got_inflate_read(&blob->zb, blob->f, outlenp);
847 
848 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
849 	if (n == 0 && ferror(blob->f))
850 		return got_ferror(blob->f, GOT_ERR_IO);
851 	*outlenp = n;
852 	return NULL;
853 }