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plug some leak around imsg_init() error paths
[got-portable.git] / lib / pack.c
blob76207e49a17dadd18e86609ab7833b09d308c6d2
1 /*
2 * Copyright (c) 2018, 2019, 2020 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 #include "got_compat.h"
17
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <sys/queue.h>
21 #include <sys/uio.h>
22 #include <sys/mman.h>
23 #include <sys/resource.h>
24 #include <sys/socket.h>
25
26 #include <fcntl.h>
27 #include <errno.h>
28 #include <stdio.h>
29 #include <stdint.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <limits.h>
33 #include <unistd.h>
34 #include <zlib.h>
35
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_path.h"
39
40 #include "got_lib_hash.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_delta_cache.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_qid.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49
50 #ifndef nitems
51 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
52 #endif
53
54 #ifndef MIN
55 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
56 #endif
57
58 static const struct got_error *
59 verify_fanout_table(uint32_t *fanout_table)
60 {
61 int i;
62
63 for (i = 0; i < 0xff - 1; i++) {
64 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
65 return got_error(GOT_ERR_BAD_PACKIDX);
66 }
67
68 return NULL;
69 }
70
71 const struct got_error *
72 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
73 {
74 const struct got_error *err = NULL;
75 struct got_packidx_v2_hdr *h;
76 struct got_hash ctx;
77 uint8_t hash[GOT_HASH_DIGEST_MAXLEN];
78 size_t nobj, len_fanout, len_ids, offset, remain, digest_string_len;
79 ssize_t n;
80 int i;
81
82 got_hash_init(&ctx, p->algo);
83 digest_string_len = got_hash_digest_length(p->algo);
84
85 h = &p->hdr;
86 offset = 0;
87 remain = p->len;
88
89 if (remain < sizeof(*h->magic)) {
90 err = got_error(GOT_ERR_BAD_PACKIDX);
91 goto done;
92 }
93 if (p->map)
94 h->magic = (uint32_t *)(p->map + offset);
95 else {
96 h->magic = malloc(sizeof(*h->magic));
97 if (h->magic == NULL) {
98 err = got_error_from_errno("malloc");
99 goto done;
100 }
101 n = read(p->fd, h->magic, sizeof(*h->magic));
102 if (n < 0) {
103 err = got_error_from_errno("read");
104 goto done;
105 } else if (n != sizeof(*h->magic)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
107 goto done;
108 }
109 }
110 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
111 err = got_error(GOT_ERR_BAD_PACKIDX);
112 goto done;
113 }
114 offset += sizeof(*h->magic);
115 remain -= sizeof(*h->magic);
116
117 if (verify)
118 got_hash_update(&ctx, h->magic, sizeof(*h->magic));
119
120 if (remain < sizeof(*h->version)) {
121 err = got_error(GOT_ERR_BAD_PACKIDX);
122 goto done;
123 }
124 if (p->map)
125 h->version = (uint32_t *)(p->map + offset);
126 else {
127 h->version = malloc(sizeof(*h->version));
128 if (h->version == NULL) {
129 err = got_error_from_errno("malloc");
130 goto done;
131 }
132 n = read(p->fd, h->version, sizeof(*h->version));
133 if (n < 0) {
134 err = got_error_from_errno("read");
135 goto done;
136 } else if (n != sizeof(*h->version)) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
138 goto done;
139 }
140 }
141 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
142 err = got_error(GOT_ERR_BAD_PACKIDX);
143 goto done;
144 }
145 offset += sizeof(*h->version);
146 remain -= sizeof(*h->version);
147
148 if (verify)
149 got_hash_update(&ctx, h->version, sizeof(*h->version));
150
151 len_fanout =
152 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
153 if (remain < len_fanout) {
154 err = got_error(GOT_ERR_BAD_PACKIDX);
155 goto done;
156 }
157 if (p->map)
158 h->fanout_table = (uint32_t *)(p->map + offset);
159 else {
160 h->fanout_table = malloc(len_fanout);
161 if (h->fanout_table == NULL) {
162 err = got_error_from_errno("malloc");
163 goto done;
164 }
165 n = read(p->fd, h->fanout_table, len_fanout);
166 if (n < 0) {
167 err = got_error_from_errno("read");
168 goto done;
169 } else if (n != len_fanout) {
170 err = got_error(GOT_ERR_BAD_PACKIDX);
171 goto done;
172 }
173 }
174 err = verify_fanout_table(h->fanout_table);
175 if (err)
176 goto done;
177 if (verify)
178 got_hash_update(&ctx, h->fanout_table, len_fanout);
179 offset += len_fanout;
180 remain -= len_fanout;
181
182 nobj = be32toh(h->fanout_table[0xff]);
183 len_ids = nobj * got_hash_digest_length(p->algo);
184 if (len_ids <= nobj || len_ids > remain) {
185 err = got_error(GOT_ERR_BAD_PACKIDX);
186 goto done;
187 }
188 if (p->map)
189 h->sorted_ids = p->map + offset;
190 else {
191 h->sorted_ids = malloc(len_ids);
192 if (h->sorted_ids == NULL) {
193 err = got_error(GOT_ERR_BAD_PACKIDX);
194 goto done;
195 }
196 n = read(p->fd, h->sorted_ids, len_ids);
197 if (n < 0)
198 err = got_error_from_errno("read");
199 else if (n != len_ids) {
200 err = got_error(GOT_ERR_BAD_PACKIDX);
201 goto done;
202 }
203 }
204 if (verify)
205 got_hash_update(&ctx, h->sorted_ids, len_ids);
206 offset += len_ids;
207 remain -= len_ids;
208
209 if (remain < nobj * sizeof(*h->crc32)) {
210 err = got_error(GOT_ERR_BAD_PACKIDX);
211 goto done;
212 }
213 if (p->map)
214 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
215 else {
216 h->crc32 = malloc(nobj * sizeof(*h->crc32));
217 if (h->crc32 == NULL) {
218 err = got_error_from_errno("malloc");
219 goto done;
220 }
221 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
222 if (n < 0)
223 err = got_error_from_errno("read");
224 else if (n != nobj * sizeof(*h->crc32)) {
225 err = got_error(GOT_ERR_BAD_PACKIDX);
226 goto done;
227 }
228 }
229 if (verify)
230 got_hash_update(&ctx, h->crc32, nobj * sizeof(*h->crc32));
231 remain -= nobj * sizeof(*h->crc32);
232 offset += nobj * sizeof(*h->crc32);
233
234 if (remain < nobj * sizeof(*h->offsets)) {
235 err = got_error(GOT_ERR_BAD_PACKIDX);
236 goto done;
237 }
238 if (p->map)
239 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
240 else {
241 h->offsets = malloc(nobj * sizeof(*h->offsets));
242 if (h->offsets == NULL) {
243 err = got_error_from_errno("malloc");
244 goto done;
245 }
246 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
247 if (n < 0)
248 err = got_error_from_errno("read");
249 else if (n != nobj * sizeof(*h->offsets)) {
250 err = got_error(GOT_ERR_BAD_PACKIDX);
251 goto done;
252 }
253 }
254 if (verify)
255 got_hash_update(&ctx, h->offsets, nobj * sizeof(*h->offsets));
256 remain -= nobj * sizeof(*h->offsets);
257 offset += nobj * sizeof(*h->offsets);
258
259 /* Large file offsets are contained only in files > 2GB. */
260 if (verify || packfile_size > 0x7fffffff) {
261 for (i = 0; i < nobj; i++) {
262 uint32_t o = h->offsets[i];
263 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
264 p->nlargeobj++;
265 }
266 }
267 if (p->nlargeobj == 0)
268 goto checksum;
269 else if (packfile_size <= 0x7fffffff) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
271 goto done;
272 }
273
274 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
275 err = got_error(GOT_ERR_BAD_PACKIDX);
276 goto done;
277 }
278 if (p->map)
279 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
280 else {
281 h->large_offsets = malloc(p->nlargeobj *
282 sizeof(*h->large_offsets));
283 if (h->large_offsets == NULL) {
284 err = got_error_from_errno("malloc");
285 goto done;
286 }
287 n = read(p->fd, h->large_offsets,
288 p->nlargeobj * sizeof(*h->large_offsets));
289 if (n < 0)
290 err = got_error_from_errno("read");
291 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
292 err = got_error(GOT_ERR_BAD_PACKIDX);
293 goto done;
294 }
295 }
296 if (verify)
297 got_hash_update(&ctx, h->large_offsets,
298 p->nlargeobj * sizeof(*h->large_offsets));
299 remain -= p->nlargeobj * sizeof(*h->large_offsets);
300 offset += p->nlargeobj * sizeof(*h->large_offsets);
301
302 checksum:
303 if (remain < digest_string_len * 2) {
304 err = got_error(GOT_ERR_BAD_PACKIDX);
305 goto done;
306 }
307 if (p->map) {
308 memcpy(h->trailer.packfile_hash, p->map + offset,
309 digest_string_len);
310 memcpy(h->trailer.packidx_hash,
311 p->map + offset + digest_string_len, digest_string_len);
312 } else {
313 n = read(p->fd, h->trailer.packfile_hash, digest_string_len);
314 if (n < 0)
315 err = got_error_from_errno("read");
316 else if (n != digest_string_len) {
317 err = got_error(GOT_ERR_BAD_PACKIDX);
318 goto done;
319 }
320 n = read(p->fd, h->trailer.packidx_hash, digest_string_len);
321 if (n < 0)
322 err = got_error_from_errno("read");
323 else if (n != digest_string_len) {
324 err = got_error(GOT_ERR_BAD_PACKIDX);
325 goto done;
326 }
327 }
328 if (verify) {
329 got_hash_update(&ctx, h->trailer.packfile_hash,
330 digest_string_len);
331 got_hash_final(&ctx, hash);
332 if (got_hash_cmp(ctx.algo, hash, h->trailer.packidx_hash) != 0)
333 err = got_error(GOT_ERR_PACKIDX_CSUM);
334 }
335 done:
336 return err;
337 }
338
339 const struct got_error *
340 got_packidx_open(struct got_packidx **packidx,
341 int dir_fd, const char *relpath, int verify,
342 enum got_hash_algorithm algo)
343 {
344 const struct got_error *err = NULL;
345 struct got_packidx *p = NULL;
346 char *pack_relpath;
347 struct stat idx_sb, pack_sb;
348
349 *packidx = NULL;
350
351 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
352 if (err)
353 return err;
354
355 /*
356 * Ensure that a corresponding pack file exists.
357 * Some Git repositories have this problem. Git seems to ignore
358 * the existence of lonely pack index files but we do not.
359 */
360 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
361 if (errno == ENOENT)
362 err = got_error_path(relpath, GOT_ERR_LONELY_PACKIDX);
363 else
364 err = got_error_from_errno2("fstatat", pack_relpath);
365 goto done;
366 }
367
368 p = calloc(1, sizeof(*p));
369 if (p == NULL) {
370 err = got_error_from_errno("calloc");
371 goto done;
372 }
373
374 p->algo = algo;
375
376 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
377 if (p->fd == -1) {
378 err = got_error_from_errno2("openat", relpath);
379 goto done;
380 }
381
382 if (fstat(p->fd, &idx_sb) != 0) {
383 err = got_error_from_errno2("fstat", relpath);
384 goto done;
385 }
386 p->len = idx_sb.st_size;
387 if (p->len < sizeof(p->hdr)) {
388 err = got_error(GOT_ERR_BAD_PACKIDX);
389 goto done;
390 }
391
392 p->path_packidx = strdup(relpath);
393 if (p->path_packidx == NULL) {
394 err = got_error_from_errno("strdup");
395 goto done;
396 }
397
398 #ifndef GOT_PACK_NO_MMAP
399 if (p->len > 0 && p->len <= SIZE_MAX) {
400 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
401 if (p->map == MAP_FAILED) {
402 if (errno != ENOMEM) {
403 err = got_error_from_errno("mmap");
404 goto done;
405 }
406 p->map = NULL; /* fall back to read(2) */
407 }
408 }
409 #endif
410
411 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
412 done:
413 if (err) {
414 if (p)
415 got_packidx_close(p);
416 } else
417 *packidx = p;
418 free(pack_relpath);
419 return err;
420 }
421
422 const struct got_error *
423 got_packidx_close(struct got_packidx *packidx)
424 {
425 const struct got_error *err = NULL;
426
427 free(packidx->path_packidx);
428 if (packidx->map) {
429 if (munmap(packidx->map, packidx->len) == -1)
430 err = got_error_from_errno("munmap");
431 } else {
432 free(packidx->hdr.magic);
433 free(packidx->hdr.version);
434 free(packidx->hdr.fanout_table);
435 free(packidx->hdr.sorted_ids);
436 free(packidx->hdr.crc32);
437 free(packidx->hdr.offsets);
438 free(packidx->hdr.large_offsets);
439 }
440 if (close(packidx->fd) == -1 && err == NULL)
441 err = got_error_from_errno("close");
442 free(packidx->sorted_offsets);
443 free(packidx->sorted_large_offsets);
444 free(packidx);
445
446 return err;
447 }
448
449 const struct got_error *
450 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
451 {
452 size_t size;
453
454 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
455 size = strlen(path_packidx) + 2;
456 if (size < GOT_PACKFILE_NAMELEN + 1)
457 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
458
459 *path_packfile = malloc(size);
460 if (*path_packfile == NULL)
461 return got_error_from_errno("malloc");
462
463 /* Copy up to and excluding ".idx". */
464 if (strlcpy(*path_packfile, path_packidx,
465 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
466 return got_error(GOT_ERR_NO_SPACE);
467
468 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
469 return got_error(GOT_ERR_NO_SPACE);
470
471 return NULL;
472 }
473
474 off_t
475 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
476 {
477 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
478 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
479 uint64_t loffset;
480 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
481 if (idx < 0 || idx >= packidx->nlargeobj ||
482 packidx->hdr.large_offsets == NULL)
483 return -1;
484 loffset = be64toh(packidx->hdr.large_offsets[idx]);
485 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
486 }
487 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
488 }
489
490 int
491 got_packidx_get_object_idx(struct got_packidx *packidx,
492 struct got_object_id *id)
493 {
494 u_int8_t id0 = id->hash[0];
495 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
496 int left = 0, right = totobj - 1;
497 size_t digest_len = got_hash_digest_length(packidx->algo);
498
499 if (id0 > 0)
500 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
501
502 while (left <= right) {
503 uint8_t *oid;
504 int i, cmp;
505
506 i = ((left + right) / 2);
507 oid = packidx->hdr.sorted_ids + i * digest_len;
508 cmp = memcmp(id->hash, oid, digest_len);
509 if (cmp == 0)
510 return i;
511 else if (cmp > 0)
512 left = i + 1;
513 else if (cmp < 0)
514 right = i - 1;
515 }
516
517 return -1;
518 }
519
520 static int
521 offset_cmp(const void *pa, const void *pb)
522 {
523 const struct got_pack_offset_index *a, *b;
524
525 a = (const struct got_pack_offset_index *)pa;
526 b = (const struct got_pack_offset_index *)pb;
527
528 if (a->offset < b->offset)
529 return -1;
530 else if (a->offset > b->offset)
531 return 1;
532
533 return 0;
534 }
535
536 static int
537 large_offset_cmp(const void *pa, const void *pb)
538 {
539 const struct got_pack_large_offset_index *a, *b;
540
541 a = (const struct got_pack_large_offset_index *)pa;
542 b = (const struct got_pack_large_offset_index *)pb;
543
544 if (a->offset < b->offset)
545 return -1;
546 else if (a->offset > b->offset)
547 return 1;
548
549 return 0;
550 }
551
552 static const struct got_error *
553 build_offset_index(struct got_packidx *p)
554 {
555 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
556 unsigned int i, j, k;
557
558 p->sorted_offsets = calloc(nobj - p->nlargeobj,
559 sizeof(p->sorted_offsets[0]));
560 if (p->sorted_offsets == NULL)
561 return got_error_from_errno("calloc");
562
563 if (p->nlargeobj > 0) {
564 p->sorted_large_offsets = calloc(p->nlargeobj,
565 sizeof(p->sorted_large_offsets[0]));
566 if (p->sorted_large_offsets == NULL)
567 return got_error_from_errno("calloc");
568 }
569
570 j = 0;
571 k = 0;
572 for (i = 0; i < nobj; i++) {
573 uint32_t offset = be32toh(p->hdr.offsets[i]);
574 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
575 uint64_t loffset;
576 uint32_t idx;
577 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
578 if (idx >= p->nlargeobj ||
579 p->nlargeobj == 0 ||
580 p->hdr.large_offsets == NULL)
581 return got_error(GOT_ERR_BAD_PACKIDX);
582 loffset = be64toh(p->hdr.large_offsets[idx]);
583 p->sorted_large_offsets[j].offset = loffset;
584 p->sorted_large_offsets[j].idx = i;
585 j++;
586 } else {
587 p->sorted_offsets[k].offset = offset;
588 p->sorted_offsets[k].idx = i;
589 k++;
590 }
591 }
592 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
593 return got_error(GOT_ERR_BAD_PACKIDX);
594
595 qsort(p->sorted_offsets, nobj - p->nlargeobj,
596 sizeof(p->sorted_offsets[0]), offset_cmp);
597
598 if (p->sorted_large_offsets)
599 qsort(p->sorted_large_offsets, p->nlargeobj,
600 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
601
602 return NULL;
603 }
604
605 const struct got_error *
606 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
607 {
608 const struct got_error *err;
609 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
610 int i, left, right;
611
612 *idx = -1;
613
614 if (packidx->sorted_offsets == NULL) {
615 err = build_offset_index(packidx);
616 if (err)
617 return err;
618 }
619
620 if (offset >= 0x7fffffff) {
621 uint64_t lo;
622 left = 0, right = packidx->nlargeobj - 1;
623 while (left <= right) {
624 i = ((left + right) / 2);
625 lo = packidx->sorted_large_offsets[i].offset;
626 if (lo == offset) {
627 *idx = packidx->sorted_large_offsets[i].idx;
628 break;
629 } else if (offset > lo)
630 left = i + 1;
631 else if (offset < lo)
632 right = i - 1;
633 }
634 } else {
635 uint32_t o;
636 left = 0, right = totobj - packidx->nlargeobj - 1;
637 while (left <= right) {
638 i = ((left + right) / 2);
639 o = packidx->sorted_offsets[i].offset;
640 if (o == offset) {
641 *idx = packidx->sorted_offsets[i].idx;
642 break;
643 } else if (offset > o)
644 left = i + 1;
645 else if (offset < o)
646 right = i - 1;
647 }
648 }
649
650 return NULL;
651 }
652
653 const struct got_error *
654 got_packidx_get_object_id(struct got_object_id *id,
655 struct got_packidx *packidx, int idx)
656 {
657 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
658 uint8_t *oid;
659 size_t digest_len = got_hash_digest_length(packidx->algo);
660
661 if (idx < 0 || idx >= totobj)
662 return got_error(GOT_ERR_NO_OBJ);
663
664 oid = packidx->hdr.sorted_ids + idx * digest_len;
665 memcpy(id->hash, oid, digest_len);
666 id->algo = packidx->algo;
667 return NULL;
668 }
669
670 const struct got_error *
671 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
672 struct got_packidx *packidx, const char *id_str_prefix)
673 {
674 const struct got_error *err = NULL;
675 u_int8_t id0;
676 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
677 char hex[3];
678 size_t prefix_len = strlen(id_str_prefix);
679 uint8_t *oid;
680 uint32_t i = 0;
681 size_t digest_len = got_hash_digest_length(packidx->algo);
682
683 if (prefix_len < 2)
684 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
685
686 hex[0] = id_str_prefix[0];
687 hex[1] = id_str_prefix[1];
688 hex[2] = '\0';
689 if (!got_parse_xdigit(&id0, hex))
690 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
691
692 if (id0 > 0)
693 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
694 oid = packidx->hdr.sorted_ids + i * digest_len;
695 while (i < totobj && oid[0] == id0) {
696 char id_str[GOT_HASH_DIGEST_STRING_MAXLEN];
697 struct got_object_qid *qid;
698 int cmp;
699
700 if (!got_hash_digest_to_str(oid, id_str, sizeof(id_str),
701 packidx->algo))
702 return got_error(GOT_ERR_NO_SPACE);
703
704 cmp = strncmp(id_str, id_str_prefix, prefix_len);
705 if (cmp < 0) {
706 oid = packidx->hdr.sorted_ids + (++i) * digest_len;
707 continue;
708 } else if (cmp > 0)
709 break;
710
711 err = got_object_qid_alloc_partial(&qid);
712 if (err)
713 return err;
714 memcpy(qid->id.hash, oid, digest_len);
715 qid->id.algo = packidx->algo;
716 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
717
718 oid = packidx->hdr.sorted_ids + (++i) * digest_len;
719 }
720
721 return NULL;
722 }
723
724 static void
725 set_max_datasize(void)
726 {
727 struct rlimit rl;
728
729 if (getrlimit(RLIMIT_DATA, &rl) != 0)
730 return;
731
732 rl.rlim_cur = rl.rlim_max;
733 setrlimit(RLIMIT_DATA, &rl);
734 }
735
736 const struct got_error *
737 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
738 {
739 const struct got_error *err = NULL;
740 int imsg_fds[2];
741 pid_t pid;
742 struct imsgbuf *ibuf;
743
744 ibuf = calloc(1, sizeof(*ibuf));
745 if (ibuf == NULL)
746 return got_error_from_errno("calloc");
747
748 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
749 if (pack->privsep_child == NULL) {
750 err = got_error_from_errno("calloc");
751 free(ibuf);
752 return err;
753 }
754 pack->child_has_tempfiles = 0;
755 pack->child_has_delta_outfd = 0;
756
757 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
758 err = got_error_from_errno("socketpair");
759 goto done;
760 }
761
762 pid = fork();
763 if (pid == -1) {
764 err = got_error_from_errno("fork");
765 close(imsg_fds[0]);
766 close(imsg_fds[1]);
767 goto done;
768 } else if (pid == 0) {
769 set_max_datasize();
770 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
771 pack->path_packfile);
772 /* not reached */
773 }
774
775 if (close(imsg_fds[1]) == -1) {
776 err = got_error_from_errno("close");
777 close(imsg_fds[0]);
778 goto done;
779 }
780 pack->privsep_child->imsg_fd = imsg_fds[0];
781 pack->privsep_child->pid = pid;
782 imsg_init(ibuf, imsg_fds[0]);
783 pack->privsep_child->ibuf = ibuf;
784
785 err = got_privsep_init_pack_child(ibuf, pack, packidx);
786 if (err) {
787 const struct got_error *child_err;
788 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
789 child_err = got_privsep_wait_for_child(
790 pack->privsep_child->pid);
791 if (child_err && err == NULL)
792 err = child_err;
793 }
794 done:
795 if (err) {
796 free(ibuf);
797 free(pack->privsep_child);
798 pack->privsep_child = NULL;
799 }
800 return err;
801 }
802
803 static const struct got_error *
804 pack_stop_privsep_child(struct got_pack *pack)
805 {
806 const struct got_error *err = NULL, *close_err = NULL;
807
808 if (pack->privsep_child == NULL)
809 return NULL;
810
811 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
812 if (err)
813 return err;
814 if (close(pack->privsep_child->imsg_fd) == -1)
815 close_err = got_error_from_errno("close");
816 err = got_privsep_wait_for_child(pack->privsep_child->pid);
817 if (close_err && err == NULL)
818 err = close_err;
819 imsg_clear(pack->privsep_child->ibuf);
820 free(pack->privsep_child->ibuf);
821 free(pack->privsep_child);
822 pack->privsep_child = NULL;
823 return err;
824 }
825
826 const struct got_error *
827 got_pack_close(struct got_pack *pack)
828 {
829 const struct got_error *err = NULL;
830
831 err = pack_stop_privsep_child(pack);
832 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
833 err = got_error_from_errno("munmap");
834 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
835 err = got_error_from_errno("close");
836 pack->fd = -1;
837 free(pack->path_packfile);
838 pack->path_packfile = NULL;
839 pack->filesize = 0;
840 if (pack->delta_cache) {
841 got_delta_cache_free(pack->delta_cache);
842 pack->delta_cache = NULL;
843 }
844
845 /*
846 * Leave accumfd and basefd alone. They are managed by the
847 * repository layer and can be reused.
848 */
849
850 return err;
851 }
852
853 const struct got_error *
854 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
855 struct got_pack *pack, off_t offset)
856 {
857 uint8_t t = 0;
858 uint64_t s = 0;
859 uint8_t sizeN;
860 size_t mapoff = 0;
861 int i = 0;
862
863 *len = 0;
864
865 if (offset >= pack->filesize)
866 return got_error(GOT_ERR_PACK_OFFSET);
867
868 if (pack->map) {
869 if (offset > SIZE_MAX) {
870 return got_error_fmt(GOT_ERR_PACK_OFFSET,
871 "offset %lld overflows size_t",
872 (long long)offset);
873 }
874
875 mapoff = (size_t)offset;
876 } else {
877 if (lseek(pack->fd, offset, SEEK_SET) == -1)
878 return got_error_from_errno("lseek");
879 }
880
881 do {
882 /* We do not support size values which don't fit in 64 bit. */
883 if (i > 9)
884 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
885 "packfile offset %lld", (long long)offset);
886
887 if (pack->map) {
888 if (mapoff + sizeof(sizeN) >= pack->filesize)
889 return got_error(GOT_ERR_BAD_PACKFILE);
890 sizeN = *(pack->map + mapoff);
891 mapoff += sizeof(sizeN);
892 } else {
893 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
894 if (n < 0)
895 return got_error_from_errno("read");
896 if (n != sizeof(sizeN))
897 return got_error(GOT_ERR_BAD_PACKFILE);
898 }
899 *len += sizeof(sizeN);
900
901 if (i == 0) {
902 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
903 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
904 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
905 } else {
906 size_t shift = 4 + 7 * (i - 1);
907 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
908 }
909 i++;
910 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
911
912 *type = t;
913 *size = s;
914 return NULL;
915 }
916
917 static const struct got_error *
918 open_plain_object(struct got_object **obj, struct got_object_id *id,
919 uint8_t type, off_t offset, size_t size, int idx)
920 {
921 *obj = calloc(1, sizeof(**obj));
922 if (*obj == NULL)
923 return got_error_from_errno("calloc");
924
925 (*obj)->type = type;
926 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
927 (*obj)->pack_idx = idx;
928 (*obj)->hdrlen = 0;
929 (*obj)->size = size;
930 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
931 (*obj)->pack_offset = offset;
932
933 return NULL;
934 }
935
936 static const struct got_error *
937 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
938 off_t delta_offset)
939 {
940 int64_t o = 0;
941 uint8_t offN;
942 int i = 0;
943
944 *offset = 0;
945 *len = 0;
946
947 do {
948 /* We do not support offset values which don't fit in 64 bit. */
949 if (i > 8)
950 return got_error(GOT_ERR_NO_SPACE);
951
952 if (pack->map) {
953 size_t mapoff;
954
955 if (delta_offset > SIZE_MAX - *len) {
956 return got_error_fmt(GOT_ERR_PACK_OFFSET,
957 "mapoff %lld would overflow size_t",
958 (long long)delta_offset + *len);
959 }
960
961 mapoff = (size_t)delta_offset + *len;
962 if (mapoff + sizeof(offN) >= pack->filesize)
963 return got_error(GOT_ERR_PACK_OFFSET);
964 offN = *(pack->map + mapoff);
965 } else {
966 ssize_t n;
967 n = read(pack->fd, &offN, sizeof(offN));
968 if (n < 0)
969 return got_error_from_errno("read");
970 if (n != sizeof(offN))
971 return got_error(GOT_ERR_BAD_PACKFILE);
972 }
973 *len += sizeof(offN);
974
975 if (i == 0)
976 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
977 else {
978 o++;
979 o <<= 7;
980 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
981 }
982 i++;
983 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
984
985 *offset = o;
986 return NULL;
987 }
988
989 const struct got_error *
990 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
991 struct got_pack *pack, off_t offset, size_t tslen)
992 {
993 const struct got_error *err;
994 int64_t negoffset;
995 size_t negofflen;
996
997 *len = 0;
998
999 err = parse_negative_offset(&negoffset, &negofflen, pack,
1000 offset + tslen);
1001 if (err)
1002 return err;
1003
1004 /* Compute the base object's offset (must be in the same pack file). */
1005 *base_offset = (offset - negoffset);
1006 if (*base_offset <= 0)
1007 return got_error(GOT_ERR_BAD_PACKFILE);
1008
1009 *len = negofflen;
1010 return NULL;
1011 }
1012
1013 static const struct got_error *
1014 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1015 size_t *delta_compressed_len, size_t delta_data_offset,
1016 struct got_pack *pack)
1017 {
1018 const struct got_error *err = NULL;
1019 size_t consumed = 0;
1020
1021 if (pack->map) {
1022 if (delta_data_offset >= pack->filesize)
1023 return got_error(GOT_ERR_PACK_OFFSET);
1024 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1025 &consumed, NULL, pack->map, delta_data_offset,
1026 pack->filesize - delta_data_offset);
1027 if (err)
1028 return err;
1029 } else {
1030 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1031 return got_error_from_errno("lseek");
1032 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1033 &consumed, NULL, 0, pack->fd);
1034 if (err)
1035 return err;
1036 }
1037
1038 if (delta_compressed_len)
1039 *delta_compressed_len = consumed;
1040
1041 return NULL;
1042 }
1043
1044 static const struct got_error *
1045 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1046 int delta_type, size_t delta_size, off_t delta_data_offset)
1047 {
1048 struct got_delta *delta;
1049
1050 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1051 delta_data_offset);
1052 if (delta == NULL)
1053 return got_error_from_errno("got_delta_open");
1054 /* delta is freed in got_object_close() */
1055 deltas->nentries++;
1056 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1057 return NULL;
1058 }
1059
1060 static const struct got_error *
1061 resolve_offset_delta(struct got_delta_chain *deltas,
1062 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1063 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1064 {
1065 const struct got_error *err;
1066 off_t base_offset;
1067 uint8_t base_type;
1068 uint64_t base_size;
1069 size_t base_tslen;
1070 off_t delta_data_offset;
1071 size_t consumed;
1072
1073 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1074 delta_offset, tslen);
1075 if (err)
1076 return err;
1077
1078 delta_data_offset = delta_offset + tslen + consumed;
1079 if (delta_data_offset >= pack->filesize)
1080 return got_error(GOT_ERR_PACK_OFFSET);
1081
1082 if (pack->map == NULL) {
1083 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1084 if (delta_data_offset == -1)
1085 return got_error_from_errno("lseek");
1086 }
1087
1088 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1089 delta_data_offset);
1090 if (err)
1091 return err;
1092
1093 /* An offset delta must be in the same packfile. */
1094 if (base_offset >= pack->filesize)
1095 return got_error(GOT_ERR_PACK_OFFSET);
1096
1097 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1098 &base_tslen, pack, base_offset);
1099 if (err)
1100 return err;
1101
1102 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1103 base_tslen, base_type, base_size, recursion - 1);
1104 }
1105
1106 const struct got_error *
1107 got_pack_parse_ref_delta(struct got_object_id *id,
1108 struct got_pack *pack, off_t delta_offset, int tslen)
1109 {
1110 size_t digest_len = got_hash_digest_length(pack->algo);
1111
1112 memset(id, 0, sizeof(*id));
1113 id->algo = pack->algo;
1114
1115 if (pack->map) {
1116 size_t mapoff;
1117
1118 if (delta_offset > SIZE_MAX - tslen) {
1119 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1120 "mapoff %lld would overflow size_t",
1121 (long long)delta_offset + tslen);
1122 }
1123
1124 mapoff = delta_offset + tslen;
1125 if (mapoff + sizeof(*id) >= pack->filesize)
1126 return got_error(GOT_ERR_PACK_OFFSET);
1127 memcpy(id->hash, pack->map + mapoff, digest_len);
1128 } else {
1129 ssize_t n;
1130 n = read(pack->fd, id->hash, digest_len);
1131 if (n < 0)
1132 return got_error_from_errno("read");
1133 if (n != digest_len)
1134 return got_error(GOT_ERR_BAD_PACKFILE);
1135 }
1136
1137 return NULL;
1138 }
1139
1140 static const struct got_error *
1141 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1142 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1143 size_t delta_size, unsigned int recursion)
1144 {
1145 const struct got_error *err;
1146 struct got_object_id id;
1147 int idx;
1148 off_t base_offset;
1149 uint8_t base_type;
1150 uint64_t base_size;
1151 size_t base_tslen;
1152 off_t delta_data_offset;
1153
1154 if (delta_offset + tslen >= pack->filesize)
1155 return got_error(GOT_ERR_PACK_OFFSET);
1156
1157 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1158 if (err)
1159 return err;
1160 if (pack->map) {
1161 delta_data_offset = delta_offset + tslen +
1162 got_hash_digest_length(packidx->algo);
1163 } else {
1164 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1165 if (delta_data_offset == -1)
1166 return got_error_from_errno("lseek");
1167 }
1168
1169 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1170 delta_data_offset);
1171 if (err)
1172 return err;
1173
1174 /* Delta base must be in the same pack file. */
1175 idx = got_packidx_get_object_idx(packidx, &id);
1176 if (idx == -1)
1177 return got_error(GOT_ERR_NO_OBJ);
1178
1179 base_offset = got_packidx_get_object_offset(packidx, idx);
1180 if (base_offset == -1)
1181 return got_error(GOT_ERR_BAD_PACKIDX);
1182
1183 if (base_offset >= pack->filesize)
1184 return got_error(GOT_ERR_PACK_OFFSET);
1185
1186 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1187 &base_tslen, pack, base_offset);
1188 if (err)
1189 return err;
1190
1191 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1192 base_tslen, base_type, base_size, recursion - 1);
1193 }
1194
1195 const struct got_error *
1196 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1197 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1198 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1199 {
1200 const struct got_error *err = NULL;
1201
1202 if (--recursion == 0)
1203 return got_error(GOT_ERR_RECURSION);
1204
1205 switch (delta_type) {
1206 case GOT_OBJ_TYPE_COMMIT:
1207 case GOT_OBJ_TYPE_TREE:
1208 case GOT_OBJ_TYPE_BLOB:
1209 case GOT_OBJ_TYPE_TAG:
1210 /* Plain types are the final delta base. Recursion ends. */
1211 err = add_delta(deltas, delta_offset, tslen, delta_type,
1212 delta_size, 0);
1213 break;
1214 case GOT_OBJ_TYPE_OFFSET_DELTA:
1215 err = resolve_offset_delta(deltas, packidx, pack,
1216 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1217 break;
1218 case GOT_OBJ_TYPE_REF_DELTA:
1219 err = resolve_ref_delta(deltas, packidx, pack,
1220 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1221 break;
1222 default:
1223 return got_error(GOT_ERR_OBJ_TYPE);
1224 }
1225
1226 return err;
1227 }
1228
1229 static const struct got_error *
1230 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1231 struct got_pack *pack, struct got_object_id *id, off_t offset,
1232 size_t tslen, int delta_type, size_t delta_size, int idx)
1233 {
1234 const struct got_error *err = NULL;
1235 int resolved_type;
1236
1237 *obj = calloc(1, sizeof(**obj));
1238 if (*obj == NULL)
1239 return got_error_from_errno("calloc");
1240
1241 (*obj)->flags = 0;
1242 (*obj)->hdrlen = 0;
1243 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1244 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1245 (*obj)->pack_offset = offset + tslen;
1246
1247 STAILQ_INIT(&(*obj)->deltas.entries);
1248 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1249 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1250 (*obj)->pack_idx = idx;
1251
1252 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1253 offset, tslen, delta_type, delta_size,
1254 GOT_DELTA_CHAIN_RECURSION_MAX);
1255 if (err)
1256 goto done;
1257
1258 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1259 if (err)
1260 goto done;
1261 (*obj)->type = resolved_type;
1262 done:
1263 if (err) {
1264 got_object_close(*obj);
1265 *obj = NULL;
1266 }
1267 return err;
1268 }
1269
1270 const struct got_error *
1271 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1272 struct got_packidx *packidx, int idx, struct got_object_id *id)
1273 {
1274 const struct got_error *err = NULL;
1275 off_t offset;
1276 uint8_t type;
1277 uint64_t size;
1278 size_t tslen;
1279
1280 *obj = NULL;
1281
1282 offset = got_packidx_get_object_offset(packidx, idx);
1283 if (offset == -1)
1284 return got_error(GOT_ERR_BAD_PACKIDX);
1285
1286 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1287 pack, offset);
1288 if (err)
1289 return err;
1290
1291 switch (type) {
1292 case GOT_OBJ_TYPE_COMMIT:
1293 case GOT_OBJ_TYPE_TREE:
1294 case GOT_OBJ_TYPE_BLOB:
1295 case GOT_OBJ_TYPE_TAG:
1296 err = open_plain_object(obj, id, type, offset + tslen,
1297 size, idx);
1298 break;
1299 case GOT_OBJ_TYPE_OFFSET_DELTA:
1300 case GOT_OBJ_TYPE_REF_DELTA:
1301 err = open_delta_object(obj, packidx, pack, id, offset,
1302 tslen, type, size, idx);
1303 break;
1304 default:
1305 err = got_error(GOT_ERR_OBJ_TYPE);
1306 break;
1307 }
1308
1309 return err;
1310 }
1311
1312 const struct got_error *
1313 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1314 struct got_delta_chain *deltas, struct got_pack *pack)
1315 {
1316 struct got_delta *delta;
1317 uint64_t base_size = 0, result_size = 0;
1318
1319 *max_size = 0;
1320 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1321 /* Plain object types are the delta base. */
1322 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1323 delta->type != GOT_OBJ_TYPE_TREE &&
1324 delta->type != GOT_OBJ_TYPE_BLOB &&
1325 delta->type != GOT_OBJ_TYPE_TAG) {
1326 const struct got_error *err;
1327 uint8_t *delta_buf = NULL;
1328 size_t delta_len;
1329 int cached = 1;
1330
1331 if (pack->delta_cache) {
1332 got_delta_cache_get(&delta_buf, &delta_len,
1333 NULL, NULL, pack->delta_cache,
1334 delta->data_offset);
1335 }
1336 if (delta_buf == NULL) {
1337 cached = 0;
1338 err = read_delta_data(&delta_buf, &delta_len,
1339 NULL, delta->data_offset, pack);
1340 if (err)
1341 return err;
1342 }
1343 if (pack->delta_cache && !cached) {
1344 err = got_delta_cache_add(pack->delta_cache,
1345 delta->data_offset, delta_buf, delta_len);
1346 if (err == NULL)
1347 cached = 1;
1348 else if (err->code != GOT_ERR_NO_SPACE) {
1349 free(delta_buf);
1350 return err;
1351 }
1352 }
1353 err = got_delta_get_sizes(&base_size, &result_size,
1354 delta_buf, delta_len);
1355 if (!cached)
1356 free(delta_buf);
1357 if (err)
1358 return err;
1359 } else
1360 base_size = delta->size;
1361 if (base_size > *max_size)
1362 *max_size = base_size;
1363 if (result_size > *max_size)
1364 *max_size = result_size;
1365 }
1366
1367 return NULL;
1368 }
1369
1370 const struct got_error *
1371 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1372 struct got_pack *pack)
1373 {
1374 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1375 return got_error(GOT_ERR_OBJ_TYPE);
1376
1377 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1378 }
1379
1380 const struct got_error *
1381 got_pack_dump_delta_chain_to_file(size_t *result_size,
1382 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1383 FILE *base_file, FILE *accum_file)
1384 {
1385 const struct got_error *err = NULL;
1386 struct got_delta *delta;
1387 uint8_t *base_buf = NULL, *accum_buf = NULL;
1388 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1389 /* We process small enough files entirely in memory for speed. */
1390 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1391 uint64_t max_size = 0;
1392 int n = 0;
1393
1394 *result_size = 0;
1395
1396 if (STAILQ_EMPTY(&deltas->entries))
1397 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1398
1399 if (pack->delta_cache) {
1400 uint8_t *delta_buf = NULL, *fulltext = NULL;
1401 size_t delta_len, fulltext_len;
1402
1403 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1404 got_delta_cache_get(&delta_buf, &delta_len,
1405 &fulltext, &fulltext_len,
1406 pack->delta_cache, delta->data_offset);
1407 if (fulltext) {
1408 size_t w;
1409
1410 w = fwrite(fulltext, 1, fulltext_len, outfile);
1411 if (w != fulltext_len)
1412 return got_ferror(outfile, GOT_ERR_IO);
1413 if (fflush(outfile) != 0)
1414 return got_error_from_errno("fflush");
1415 *result_size = fulltext_len;
1416 return NULL;
1417 }
1418 }
1419
1420 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1421 return got_error_from_errno("fseeko");
1422 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1423 return got_error_from_errno("fseeko");
1424
1425 /* Deltas are ordered in ascending order. */
1426 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1427 uint8_t *delta_buf = NULL, *fulltext = NULL;
1428 size_t delta_len, fulltext_len;
1429 uint64_t base_size, result_size = 0;
1430 int cached = 1;
1431 if (n == 0) {
1432 size_t mapoff;
1433 off_t delta_data_offset;
1434
1435 /* Plain object types are the delta base. */
1436 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1437 delta->type != GOT_OBJ_TYPE_TREE &&
1438 delta->type != GOT_OBJ_TYPE_BLOB &&
1439 delta->type != GOT_OBJ_TYPE_TAG) {
1440 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1441 goto done;
1442 }
1443
1444 delta_data_offset = delta->offset + delta->tslen;
1445 if (delta_data_offset >= pack->filesize) {
1446 err = got_error(GOT_ERR_PACK_OFFSET);
1447 goto done;
1448 }
1449 if (pack->map == NULL) {
1450 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1451 == -1) {
1452 err = got_error_from_errno("lseek");
1453 goto done;
1454 }
1455 }
1456 if (delta->size > max_size)
1457 max_size = delta->size;
1458 if (max_size > max_bufsize) {
1459 if (pack->map) {
1460 if (delta_data_offset > SIZE_MAX) {
1461 return got_error_fmt(
1462 GOT_ERR_RANGE,
1463 "delta offset %lld "
1464 "overflows size_t",
1465 (long long)
1466 delta_data_offset);
1467 }
1468
1469 mapoff = delta_data_offset;
1470 err = got_inflate_to_file_mmap(
1471 &base_bufsz, NULL, NULL, pack->map,
1472 mapoff, pack->filesize - mapoff,
1473 base_file);
1474 } else
1475 err = got_inflate_to_file_fd(
1476 &base_bufsz, NULL, NULL, pack->fd,
1477 base_file);
1478 } else {
1479 accum_buf = malloc(max_size);
1480 if (accum_buf == NULL) {
1481 err = got_error_from_errno("malloc");
1482 goto done;
1483 }
1484 accum_bufsz = max_size;
1485 if (pack->map) {
1486 if (delta_data_offset > SIZE_MAX) {
1487 err = got_error_fmt(
1488 GOT_ERR_RANGE,
1489 "delta offset %lld "
1490 "overflows size_t",
1491 (long long)
1492 delta_data_offset);
1493 goto done;
1494 }
1495
1496 mapoff = delta_data_offset;
1497 err = got_inflate_to_mem_mmap(&base_buf,
1498 &base_bufsz, NULL, NULL,
1499 pack->map, mapoff,
1500 pack->filesize - mapoff);
1501 } else
1502 err = got_inflate_to_mem_fd(&base_buf,
1503 &base_bufsz, NULL, NULL, max_size,
1504 pack->fd);
1505 }
1506 if (err)
1507 goto done;
1508 n++;
1509 if (base_buf == NULL)
1510 rewind(base_file);
1511 else if (pack->delta_cache && fulltext == NULL) {
1512 err = got_delta_cache_add(pack->delta_cache,
1513 delta_data_offset, NULL, 0);
1514 if (err) {
1515 if (err->code != GOT_ERR_NO_SPACE)
1516 goto done;
1517 err = NULL;
1518 } else {
1519 err = got_delta_cache_add_fulltext(
1520 pack->delta_cache,
1521 delta_data_offset,
1522 base_buf, base_bufsz);
1523 if (err &&
1524 err->code != GOT_ERR_NO_SPACE)
1525 goto done;
1526 err = NULL;
1527 }
1528 }
1529 continue;
1530 }
1531
1532 if (pack->delta_cache) {
1533 got_delta_cache_get(&delta_buf, &delta_len,
1534 &fulltext, &fulltext_len,
1535 pack->delta_cache, delta->data_offset);
1536 }
1537 if (delta_buf == NULL) {
1538 cached = 0;
1539 err = read_delta_data(&delta_buf, &delta_len, NULL,
1540 delta->data_offset, pack);
1541 if (err)
1542 goto done;
1543 }
1544 if (pack->delta_cache && !cached) {
1545 err = got_delta_cache_add(pack->delta_cache,
1546 delta->data_offset, delta_buf, delta_len);
1547 if (err == NULL)
1548 cached = 1;
1549 else if (err->code != GOT_ERR_NO_SPACE) {
1550 free(delta_buf);
1551 goto done;
1552 }
1553 }
1554
1555 err = got_delta_get_sizes(&base_size, &result_size,
1556 delta_buf, delta_len);
1557 if (err) {
1558 if (!cached)
1559 free(delta_buf);
1560 goto done;
1561 }
1562 if (base_size > max_size)
1563 max_size = base_size;
1564 if (result_size > max_size)
1565 max_size = result_size;
1566 if (fulltext_len > max_size)
1567 max_size = fulltext_len;
1568
1569 if (base_buf && max_size > max_bufsize) {
1570 /* Switch from buffers to temporary files. */
1571 size_t w = fwrite(base_buf, 1, base_bufsz,
1572 base_file);
1573 if (w != base_bufsz) {
1574 err = got_ferror(outfile, GOT_ERR_IO);
1575 if (!cached)
1576 free(delta_buf);
1577 goto done;
1578 }
1579 free(base_buf);
1580 base_buf = NULL;
1581 free(accum_buf);
1582 accum_buf = NULL;
1583 }
1584
1585 if (base_buf && max_size > base_bufsz) {
1586 uint8_t *p = realloc(base_buf, max_size);
1587 if (p == NULL) {
1588 err = got_error_from_errno("realloc");
1589 if (!cached)
1590 free(delta_buf);
1591 goto done;
1592 }
1593 base_buf = p;
1594 base_bufsz = max_size;
1595 }
1596
1597 if (accum_buf && max_size > accum_bufsz) {
1598 uint8_t *p = realloc(accum_buf, max_size);
1599 if (p == NULL) {
1600 err = got_error_from_errno("realloc");
1601 if (!cached)
1602 free(delta_buf);
1603 goto done;
1604 }
1605 accum_buf = p;
1606 accum_bufsz = max_size;
1607 }
1608
1609 if (base_buf) {
1610 if (fulltext) {
1611 memcpy(accum_buf, fulltext, fulltext_len);
1612 accum_size = fulltext_len;
1613 err = NULL;
1614 } else {
1615 err = got_delta_apply_in_mem(base_buf,
1616 base_bufsz, delta_buf, delta_len,
1617 accum_buf, &accum_size, max_size);
1618 }
1619 n++;
1620 if (!cached)
1621 free(delta_buf);
1622 if (err)
1623 goto done;
1624 if (fulltext == NULL) {
1625 err = got_delta_cache_add_fulltext(
1626 pack->delta_cache, delta->data_offset,
1627 accum_buf, accum_size);
1628 if (err) {
1629 if (err->code != GOT_ERR_NO_SPACE)
1630 goto done;
1631 err = NULL;
1632 }
1633 }
1634 } else {
1635 err = got_delta_apply(base_file, delta_buf,
1636 delta_len,
1637 /* Final delta application writes to output file. */
1638 ++n < deltas->nentries ? accum_file : outfile,
1639 &accum_size);
1640 if (!cached)
1641 free(delta_buf);
1642 if (err)
1643 goto done;
1644 }
1645
1646 if (n < deltas->nentries) {
1647 /* Accumulated delta becomes the new base. */
1648 if (base_buf) {
1649 uint8_t *tmp = accum_buf;
1650 size_t tmp_size = accum_bufsz;
1651 accum_buf = base_buf;
1652 accum_bufsz = base_bufsz;
1653 base_buf = tmp;
1654 base_bufsz = tmp_size;
1655 } else {
1656 FILE *tmp = accum_file;
1657 accum_file = base_file;
1658 base_file = tmp;
1659 rewind(base_file);
1660 rewind(accum_file);
1661 }
1662 }
1663 }
1664
1665 done:
1666 free(base_buf);
1667 if (err) {
1668 free(accum_buf);
1669 accum_buf = NULL;
1670 }
1671 if (accum_buf) {
1672 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1673 free(accum_buf);
1674 if (len != accum_size)
1675 err = got_ferror(outfile, GOT_ERR_IO);
1676 }
1677 rewind(outfile);
1678 if (err == NULL)
1679 *result_size = accum_size;
1680 return err;
1681 }
1682
1683 const struct got_error *
1684 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1685 struct got_delta_chain *deltas, struct got_pack *pack)
1686 {
1687 const struct got_error *err = NULL;
1688 struct got_delta *delta;
1689 uint8_t *base_buf = NULL, *accum_buf = NULL;
1690 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1691 uint64_t max_size = 0;
1692 int n = 0;
1693
1694 *outbuf = NULL;
1695 *outlen = 0;
1696
1697 if (STAILQ_EMPTY(&deltas->entries))
1698 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1699
1700 if (pack->delta_cache) {
1701 uint8_t *delta_buf = NULL, *fulltext = NULL;
1702 size_t delta_len, fulltext_len;
1703
1704 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1705 got_delta_cache_get(&delta_buf, &delta_len,
1706 &fulltext, &fulltext_len,
1707 pack->delta_cache, delta->data_offset);
1708 if (fulltext) {
1709 *outbuf = malloc(fulltext_len);
1710 if (*outbuf == NULL)
1711 return got_error_from_errno("malloc");
1712 memcpy(*outbuf, fulltext, fulltext_len);
1713 *outlen = fulltext_len;
1714 return NULL;
1715 }
1716 }
1717
1718 /* Deltas are ordered in ascending order. */
1719 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1720 uint8_t *delta_buf = NULL, *fulltext = NULL;
1721 size_t delta_len, fulltext_len = 0;
1722 uint64_t base_size, result_size = 0;
1723 int cached = 1;
1724 if (n == 0) {
1725 off_t delta_data_offset;
1726
1727 /* Plain object types are the delta base. */
1728 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1729 delta->type != GOT_OBJ_TYPE_TREE &&
1730 delta->type != GOT_OBJ_TYPE_BLOB &&
1731 delta->type != GOT_OBJ_TYPE_TAG) {
1732 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1733 goto done;
1734 }
1735
1736 delta_data_offset = delta->offset + delta->tslen;
1737 if (delta_data_offset >= pack->filesize) {
1738 err = got_error(GOT_ERR_PACK_OFFSET);
1739 goto done;
1740 }
1741
1742 if (pack->delta_cache) {
1743 got_delta_cache_get(&delta_buf, &delta_len,
1744 &fulltext, &fulltext_len,
1745 pack->delta_cache, delta_data_offset);
1746 }
1747
1748 if (delta->size > max_size)
1749 max_size = delta->size;
1750 if (delta->size > fulltext_len)
1751 max_size = fulltext_len;
1752
1753 if (fulltext) {
1754 base_buf = malloc(fulltext_len);
1755 if (base_buf == NULL) {
1756 err = got_error_from_errno("malloc");
1757 goto done;
1758 }
1759 memcpy(base_buf, fulltext, fulltext_len);
1760 base_bufsz = fulltext_len;
1761 } else if (pack->map) {
1762 size_t mapoff;
1763
1764 if (delta_data_offset > SIZE_MAX) {
1765 return got_error_fmt(GOT_ERR_RANGE,
1766 "delta %lld offset would "
1767 "overflow size_t",
1768 (long long)delta_data_offset);
1769 }
1770
1771 mapoff = delta_data_offset;
1772 err = got_inflate_to_mem_mmap(&base_buf,
1773 &base_bufsz, NULL, NULL, pack->map,
1774 mapoff, pack->filesize - mapoff);
1775 } else {
1776 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1777 == -1) {
1778 err = got_error_from_errno("lseek");
1779 goto done;
1780 }
1781 err = got_inflate_to_mem_fd(&base_buf,
1782 &base_bufsz, NULL, NULL, max_size,
1783 pack->fd);
1784 }
1785 if (err)
1786 goto done;
1787 n++;
1788
1789 if (pack->delta_cache && fulltext == NULL) {
1790 err = got_delta_cache_add(pack->delta_cache,
1791 delta_data_offset, NULL, 0);
1792 if (err) {
1793 if (err->code != GOT_ERR_NO_SPACE)
1794 goto done;
1795 err = NULL;
1796 } else {
1797 err = got_delta_cache_add_fulltext(
1798 pack->delta_cache,
1799 delta_data_offset,
1800 base_buf, base_bufsz);
1801 if (err &&
1802 err->code != GOT_ERR_NO_SPACE)
1803 goto done;
1804 err = NULL;
1805 }
1806 }
1807 continue;
1808 }
1809
1810 if (pack->delta_cache) {
1811 got_delta_cache_get(&delta_buf, &delta_len,
1812 &fulltext, &fulltext_len,
1813 pack->delta_cache, delta->data_offset);
1814 }
1815 if (delta_buf == NULL) {
1816 cached = 0;
1817 err = read_delta_data(&delta_buf, &delta_len, NULL,
1818 delta->data_offset, pack);
1819 if (err)
1820 goto done;
1821 }
1822 if (pack->delta_cache && !cached) {
1823 err = got_delta_cache_add(pack->delta_cache,
1824 delta->data_offset, delta_buf, delta_len);
1825 if (err == NULL)
1826 cached = 1;
1827 else if (err->code != GOT_ERR_NO_SPACE) {
1828 free(delta_buf);
1829 goto done;
1830 }
1831 }
1832
1833 err = got_delta_get_sizes(&base_size, &result_size,
1834 delta_buf, delta_len);
1835 if (err) {
1836 if (!cached)
1837 free(delta_buf);
1838 goto done;
1839 }
1840 if (base_size > max_size)
1841 max_size = base_size;
1842 if (result_size > max_size)
1843 max_size = result_size;
1844 if (fulltext_len > max_size)
1845 max_size = fulltext_len;
1846
1847 if (max_size > base_bufsz) {
1848 uint8_t *p = realloc(base_buf, max_size);
1849 if (p == NULL) {
1850 err = got_error_from_errno("realloc");
1851 if (!cached)
1852 free(delta_buf);
1853 goto done;
1854 }
1855 base_buf = p;
1856 base_bufsz = max_size;
1857 }
1858
1859 if (max_size > accum_bufsz) {
1860 uint8_t *p = realloc(accum_buf, max_size);
1861 if (p == NULL) {
1862 err = got_error_from_errno("realloc");
1863 if (!cached)
1864 free(delta_buf);
1865 goto done;
1866 }
1867 accum_buf = p;
1868 accum_bufsz = max_size;
1869 }
1870
1871 if (fulltext) {
1872 memcpy(accum_buf, fulltext, fulltext_len);
1873 accum_size = fulltext_len;
1874 err = NULL;
1875 } else {
1876 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1877 delta_buf, delta_len, accum_buf,
1878 &accum_size, max_size);
1879 }
1880 if (!cached)
1881 free(delta_buf);
1882 n++;
1883 if (err)
1884 goto done;
1885
1886 if (fulltext == NULL) {
1887 err = got_delta_cache_add_fulltext(pack->delta_cache,
1888 delta->data_offset, accum_buf, accum_size);
1889 if (err) {
1890 if (err->code != GOT_ERR_NO_SPACE)
1891 goto done;
1892 err = NULL;
1893 }
1894 }
1895
1896 if (n < deltas->nentries) {
1897 /* Accumulated delta becomes the new base. */
1898 uint8_t *tmp = accum_buf;
1899 size_t tmp_size = accum_bufsz;
1900 accum_buf = base_buf;
1901 accum_bufsz = base_bufsz;
1902 base_buf = tmp;
1903 base_bufsz = tmp_size;
1904 }
1905 }
1906
1907 done:
1908 free(base_buf);
1909 if (err) {
1910 free(accum_buf);
1911 *outbuf = NULL;
1912 *outlen = 0;
1913 } else {
1914 *outbuf = accum_buf;
1915 *outlen = accum_size;
1916 }
1917 return err;
1918 }
1919
1920 const struct got_error *
1921 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1922 FILE *outfile, FILE *base_file, FILE *accum_file)
1923 {
1924 const struct got_error *err = NULL;
1925
1926 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1927 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1928
1929 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1930 if (obj->pack_offset >= pack->filesize)
1931 return got_error(GOT_ERR_PACK_OFFSET);
1932
1933 if (pack->map) {
1934 size_t mapoff;
1935
1936 if (obj->pack_offset > SIZE_MAX) {
1937 return got_error_fmt(GOT_ERR_RANGE,
1938 "pack offset %lld would overflow size_t",
1939 (long long)obj->pack_offset);
1940 }
1941
1942 mapoff = obj->pack_offset;
1943 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1944 pack->map, mapoff, pack->filesize - mapoff,
1945 outfile);
1946 } else {
1947 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1948 return got_error_from_errno("lseek");
1949 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1950 pack->fd, outfile);
1951 }
1952 } else
1953 err = got_pack_dump_delta_chain_to_file(&obj->size,
1954 &obj->deltas, pack, outfile, base_file, accum_file);
1955
1956 return err;
1957 }
1958
1959 const struct got_error *
1960 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1961 struct got_object *obj, struct got_pack *pack)
1962 {
1963 const struct got_error *err = NULL;
1964
1965 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1966 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1967
1968 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1969 if (obj->pack_offset >= pack->filesize)
1970 return got_error(GOT_ERR_PACK_OFFSET);
1971 if (pack->map) {
1972 size_t mapoff;
1973
1974 if (obj->pack_offset > SIZE_MAX) {
1975 return got_error_fmt(GOT_ERR_RANGE,
1976 "pack offset %lld would overflow size_t",
1977 (long long)obj->pack_offset);
1978 }
1979
1980 mapoff = obj->pack_offset;
1981 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1982 pack->map, mapoff, pack->filesize - mapoff);
1983 } else {
1984 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1985 return got_error_from_errno("lseek");
1986 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1987 obj->size, pack->fd);
1988 }
1989 } else
1990 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1991 pack);
1992
1993 return err;
1994 }
1995
1996 static const struct got_error *
1997 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1998 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1999 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
2000 {
2001 const struct got_error *err = NULL;
2002
2003 /* Validate decompression and obtain the decompressed size. */
2004 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
2005 delta_data_offset, pack);
2006 if (err)
2007 return err;
2008
2009 /* Read delta base/result sizes from head of delta stream. */
2010 err = got_delta_get_sizes(base_size, result_size,
2011 *delta_buf, *delta_len);
2012 if (err)
2013 goto done;
2014
2015 /* Discard decompressed delta and read it again in compressed form. */
2016 free(*delta_buf);
2017 *delta_buf = malloc(*delta_len_compressed);
2018 if (*delta_buf == NULL) {
2019 err = got_error_from_errno("malloc");
2020 goto done;
2021 }
2022 if (pack->map) {
2023 if (delta_data_offset >= pack->filesize) {
2024 err = got_error(GOT_ERR_PACK_OFFSET);
2025 goto done;
2026 }
2027 memcpy(*delta_buf, pack->map + delta_data_offset,
2028 *delta_len_compressed);
2029 } else {
2030 ssize_t n;
2031 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
2032 err = got_error_from_errno("lseek");
2033 goto done;
2034 }
2035 n = read(pack->fd, *delta_buf, *delta_len_compressed);
2036 if (n < 0) {
2037 err = got_error_from_errno("read");
2038 goto done;
2039 } else if (n != *delta_len_compressed) {
2040 err = got_error(GOT_ERR_IO);
2041 goto done;
2042 }
2043 }
2044 done:
2045 if (err) {
2046 free(*delta_buf);
2047 *delta_buf = NULL;
2048 *delta_len = 0;
2049 *delta_len_compressed = 0;
2050 *base_size = 0;
2051 *result_size = 0;
2052 }
2053 return err;
2054 }
2055
2056 const struct got_error *
2057 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
2058 size_t *delta_compressed_size, off_t *delta_offset,
2059 off_t *delta_data_offset, off_t *base_offset,
2060 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
2061 struct got_pack *pack, struct got_packidx *packidx, int idx)
2062 {
2063 const struct got_error *err = NULL;
2064 off_t offset;
2065 uint8_t type;
2066 uint64_t size;
2067 size_t tslen, delta_hdrlen;
2068
2069 *delta_buf = NULL;
2070 *delta_size = 0;
2071 *delta_compressed_size = 0;
2072 *delta_offset = 0;
2073 *delta_data_offset = 0;
2074 *base_offset = 0;
2075 *base_size = 0;
2076 *result_size = 0;
2077
2078 offset = got_packidx_get_object_offset(packidx, idx);
2079 if (offset == -1)
2080 return got_error(GOT_ERR_BAD_PACKIDX);
2081
2082 if (offset >= pack->filesize)
2083 return got_error(GOT_ERR_PACK_OFFSET);
2084
2085 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
2086 pack, offset);
2087 if (err)
2088 return err;
2089
2090 if (tslen + size < tslen || offset + size < size ||
2091 tslen + offset < tslen)
2092 return got_error(GOT_ERR_PACK_OFFSET);
2093
2094 switch (type) {
2095 case GOT_OBJ_TYPE_OFFSET_DELTA:
2096 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
2097 pack, offset, tslen);
2098 if (err)
2099 return err;
2100 break;
2101 case GOT_OBJ_TYPE_REF_DELTA:
2102 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
2103 if (err)
2104 return err;
2105 delta_hdrlen = got_hash_digest_length(pack->algo);
2106 break;
2107 default:
2108 return got_error_fmt(GOT_ERR_OBJ_TYPE,
2109 "non-delta object type %d found at offset %lld",
2110 type, (long long)offset);
2111 }
2112
2113 if (tslen + delta_hdrlen < delta_hdrlen ||
2114 offset + delta_hdrlen < delta_hdrlen)
2115 return got_error(GOT_ERR_BAD_DELTA);
2116
2117 *delta_data_offset = offset + tslen + delta_hdrlen;
2118 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
2119 base_size, result_size, *delta_data_offset, pack, packidx);
2120 if (err)
2121 return err;
2122
2123 if (*delta_size != size) {
2124 err = got_error(GOT_ERR_BAD_DELTA);
2125 goto done;
2126 }
2127
2128 *delta_offset = offset;
2129 done:
2130 if (err) {
2131 free(*delta_buf);
2132 *delta_buf = NULL;
2133 *delta_size = 0;
2134 *delta_compressed_size = 0;
2135 *delta_offset = 0;
2136 *base_offset = 0;
2137 *base_size = 0;
2138 *result_size = 0;
2139 }
2140 return err;
2141 }
portable version of Game of Trees