2 * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
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.
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.
17 #include <sys/types.h>
19 #include <sys/queue.h>
35 #include "got_error.h"
36 #include "got_object.h"
37 #include "got_opentemp.h"
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_parse.h"
45 #include "got_lib_privsep.h"
46 #include "got_lib_pack.h"
49 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
53 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
56 static const struct got_error *
57 verify_fanout_table(uint32_t *fanout_table)
61 for (i = 0; i < 0xff - 1; i++) {
62 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
63 return got_error(GOT_ERR_BAD_PACKIDX);
69 const struct got_error *
70 got_packidx_init_hdr(struct got_packidx *p, int verify)
72 const struct got_error *err = NULL;
73 struct got_packidx_v2_hdr *h;
75 uint8_t sha1[SHA1_DIGEST_LENGTH];
76 size_t nobj, len_fanout, len_ids, offset, remain;
85 if (remain < sizeof(*h->magic)) {
86 err = got_error(GOT_ERR_BAD_PACKIDX);
90 h->magic = (uint32_t *)(p->map + offset);
92 h->magic = malloc(sizeof(*h->magic));
93 if (h->magic == NULL) {
94 err = got_error_from_errno("malloc");
97 n = read(p->fd, h->magic, sizeof(*h->magic));
99 err = got_error_from_errno("read");
101 } else if (n != sizeof(*h->magic)) {
102 err = got_error(GOT_ERR_BAD_PACKIDX);
106 if (betoh32(*h->magic) != GOT_PACKIDX_V2_MAGIC) {
107 err = got_error(GOT_ERR_BAD_PACKIDX);
110 offset += sizeof(*h->magic);
111 remain -= sizeof(*h->magic);
114 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
116 if (remain < sizeof(*h->version)) {
117 err = got_error(GOT_ERR_BAD_PACKIDX);
121 h->version = (uint32_t *)(p->map + offset);
123 h->version = malloc(sizeof(*h->version));
124 if (h->version == NULL) {
125 err = got_error_from_errno("malloc");
128 n = read(p->fd, h->version, sizeof(*h->version));
130 err = got_error_from_errno("read");
131 else if (n != sizeof(*h->version)) {
132 err = got_error(GOT_ERR_BAD_PACKIDX);
136 if (betoh32(*h->version) != GOT_PACKIDX_VERSION) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
140 offset += sizeof(*h->version);
141 remain -= sizeof(*h->version);
144 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
147 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
148 if (remain < len_fanout) {
149 err = got_error(GOT_ERR_BAD_PACKIDX);
153 h->fanout_table = (uint32_t *)(p->map + offset);
155 h->fanout_table = malloc(len_fanout);
156 if (h->fanout_table == NULL) {
157 err = got_error_from_errno("malloc");
160 n = read(p->fd, h->fanout_table, len_fanout);
162 err = got_error_from_errno("read");
163 else if (n != len_fanout) {
164 err = got_error(GOT_ERR_BAD_PACKIDX);
168 err = verify_fanout_table(h->fanout_table);
172 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
173 offset += len_fanout;
174 remain -= len_fanout;
176 nobj = betoh32(h->fanout_table[0xff]);
177 len_ids = nobj * sizeof(*h->sorted_ids);
178 if (len_ids <= nobj || len_ids > remain) {
179 err = got_error(GOT_ERR_BAD_PACKIDX);
184 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
186 h->sorted_ids = malloc(len_ids);
187 if (h->sorted_ids == NULL) {
188 err = got_error(GOT_ERR_BAD_PACKIDX);
191 n = read(p->fd, h->sorted_ids, len_ids);
193 err = got_error_from_errno("read");
194 else if (n != len_ids) {
195 err = got_error(GOT_ERR_BAD_PACKIDX);
200 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
204 if (remain < nobj * sizeof(*h->crc32)) {
205 err = got_error(GOT_ERR_BAD_PACKIDX);
209 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
211 h->crc32 = malloc(nobj * sizeof(*h->crc32));
212 if (h->crc32 == NULL) {
213 err = got_error_from_errno("malloc");
216 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
218 err = got_error_from_errno("read");
219 else if (n != nobj * sizeof(*h->crc32)) {
220 err = got_error(GOT_ERR_BAD_PACKIDX);
225 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
226 remain -= nobj * sizeof(*h->crc32);
227 offset += nobj * sizeof(*h->crc32);
229 if (remain < nobj * sizeof(*h->offsets)) {
230 err = got_error(GOT_ERR_BAD_PACKIDX);
234 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
236 h->offsets = malloc(nobj * sizeof(*h->offsets));
237 if (h->offsets == NULL) {
238 err = got_error_from_errno("malloc");
241 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
243 err = got_error_from_errno("read");
244 else if (n != nobj * sizeof(*h->offsets)) {
245 err = got_error(GOT_ERR_BAD_PACKIDX);
250 SHA1Update(&ctx, (uint8_t *)h->offsets,
251 nobj * sizeof(*h->offsets));
252 remain -= nobj * sizeof(*h->offsets);
253 offset += nobj * sizeof(*h->offsets);
255 /* Large file offsets are contained only in files > 2GB. */
256 if (p->len <= 0x80000000)
259 if (remain < nobj * sizeof(*h->large_offsets)) {
260 err = got_error(GOT_ERR_BAD_PACKIDX);
264 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
266 h->large_offsets = malloc(nobj * sizeof(*h->large_offsets));
267 if (h->large_offsets == NULL) {
268 err = got_error_from_errno("malloc");
271 n = read(p->fd, h->large_offsets,
272 nobj * sizeof(*h->large_offsets));
274 err = got_error_from_errno("read");
275 else if (n != nobj * sizeof(*h->large_offsets)) {
276 err = got_error(GOT_ERR_BAD_PACKIDX);
281 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
282 nobj * sizeof(*h->large_offsets));
283 remain -= nobj * sizeof(*h->large_offsets);
284 offset += nobj * sizeof(*h->large_offsets);
287 if (remain < sizeof(*h->trailer)) {
288 err = got_error(GOT_ERR_BAD_PACKIDX);
293 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
295 h->trailer = malloc(sizeof(*h->trailer));
296 if (h->trailer == NULL) {
297 err = got_error_from_errno("malloc");
300 n = read(p->fd, h->trailer, sizeof(*h->trailer));
302 err = got_error_from_errno("read");
303 else if (n != sizeof(*h->trailer)) {
304 err = got_error(GOT_ERR_BAD_PACKIDX);
309 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
310 SHA1Final(sha1, &ctx);
311 if (memcmp(h->trailer->packidx_sha1, sha1,
312 SHA1_DIGEST_LENGTH) != 0)
313 err = got_error(GOT_ERR_PACKIDX_CSUM);
319 const struct got_error *
320 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
322 const struct got_error *err = NULL;
323 struct got_packidx *p;
328 p = calloc(1, sizeof(*p));
330 return got_error_from_errno("calloc");
332 p->fd = open(path, O_RDONLY | O_NOFOLLOW);
334 err = got_error_from_errno2("open", path);
339 if (fstat(p->fd, &sb) != 0) {
340 err = got_error_from_errno2("fstat", path);
346 if (p->len < sizeof(p->hdr)) {
347 err = got_error(GOT_ERR_BAD_PACKIDX);
353 p->path_packidx = strdup(path);
354 if (p->path_packidx == NULL) {
355 err = got_error_from_errno("strdup");
359 #ifndef GOT_PACK_NO_MMAP
360 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
361 if (p->map == MAP_FAILED) {
362 if (errno != ENOMEM) {
363 err = got_error_from_errno("mmap");
366 p->map = NULL; /* fall back to read(2) */
370 err = got_packidx_init_hdr(p, verify);
373 got_packidx_close(p);
380 const struct got_error *
381 got_packidx_close(struct got_packidx *packidx)
383 const struct got_error *err = NULL;
385 free(packidx->path_packidx);
387 if (munmap(packidx->map, packidx->len) == -1)
388 err = got_error_from_errno("munmap");
390 free(packidx->hdr.magic);
391 free(packidx->hdr.version);
392 free(packidx->hdr.fanout_table);
393 free(packidx->hdr.sorted_ids);
394 free(packidx->hdr.crc32);
395 free(packidx->hdr.offsets);
396 free(packidx->hdr.large_offsets);
397 free(packidx->hdr.trailer);
399 if (close(packidx->fd) != 0 && err == NULL)
400 err = got_error_from_errno("close");
407 get_object_offset(struct got_packidx *packidx, int idx)
409 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
410 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
411 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
413 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
414 if (idx < 0 || idx > totobj ||
415 packidx->hdr.large_offsets == NULL)
417 loffset = betoh64(packidx->hdr.large_offsets[idx]);
418 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
420 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
424 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
426 u_int8_t id0 = id->sha1[0];
427 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
428 int left = 0, right = totobj - 1;
431 left = betoh32(packidx->hdr.fanout_table[id0 - 1]);
433 while (left <= right) {
434 struct got_packidx_object_id *oid;
437 i = ((left + right) / 2);
438 oid = &packidx->hdr.sorted_ids[i];
439 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
451 const struct got_error *
452 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
453 struct got_packidx *packidx, const char *id_str_prefix)
455 const struct got_error *err = NULL;
457 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
459 size_t prefix_len = strlen(id_str_prefix);
460 struct got_packidx_object_id *oid;
463 SIMPLEQ_INIT(matched_ids);
466 return got_error(GOT_ERR_BAD_OBJ_ID_STR);
468 hex[0] = id_str_prefix[0];
469 hex[1] = id_str_prefix[1];
471 if (!got_parse_xdigit(&id0, hex))
472 return got_error(GOT_ERR_BAD_OBJ_ID_STR);
474 i = betoh32(packidx->hdr.fanout_table[id0 - 1]);
478 oid = &packidx->hdr.sorted_ids[i];
479 while (i < totobj && oid->sha1[0] == id0) {
480 char id_str[SHA1_DIGEST_STRING_LENGTH];
481 struct got_object_qid *qid;
484 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
485 return got_error(GOT_ERR_NO_SPACE);
487 cmp = strncmp(id_str, id_str_prefix, prefix_len);
489 oid = &packidx->hdr.sorted_ids[++i];
494 err = got_object_qid_alloc_partial(&qid);
497 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
498 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
500 oid = &packidx->hdr.sorted_ids[++i];
504 got_object_id_queue_free(matched_ids);
508 const struct got_error *
509 got_pack_stop_privsep_child(struct got_pack *pack)
511 const struct got_error *err = NULL;
513 if (pack->privsep_child == NULL)
516 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
519 err = got_privsep_wait_for_child(pack->privsep_child->pid);
520 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
521 err = got_error_from_errno("close");
522 free(pack->privsep_child);
523 pack->privsep_child = NULL;
527 const struct got_error *
528 got_pack_close(struct got_pack *pack)
530 const struct got_error *err = NULL;
532 err = got_pack_stop_privsep_child(pack);
533 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
534 err = got_error_from_errno("munmap");
535 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
536 err = got_error_from_errno("close");
538 free(pack->path_packfile);
539 pack->path_packfile = NULL;
545 static const struct got_error *
546 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
547 struct got_pack *pack, off_t offset)
557 if (offset >= pack->filesize)
558 return got_error(GOT_ERR_PACK_OFFSET);
561 mapoff = (size_t)offset;
563 if (lseek(pack->fd, offset, SEEK_SET) == -1)
564 return got_error_from_errno("lseek");
568 /* We do not support size values which don't fit in 64 bit. */
570 return got_error(GOT_ERR_NO_SPACE);
573 sizeN = *(pack->map + mapoff);
574 mapoff += sizeof(sizeN);
576 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
578 return got_error_from_errno("read");
579 if (n != sizeof(sizeN))
580 return got_error(GOT_ERR_BAD_PACKFILE);
582 *len += sizeof(sizeN);
585 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
586 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
587 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
589 size_t shift = 4 + 7 * (i - 1);
590 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
593 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
600 static const struct got_error *
601 open_plain_object(struct got_object **obj, const char *path_packfile,
602 struct got_object_id *id, uint8_t type, off_t offset, size_t size, int idx)
604 *obj = calloc(1, sizeof(**obj));
606 return got_error_from_errno("calloc");
608 (*obj)->path_packfile = strdup(path_packfile);
609 if ((*obj)->path_packfile == NULL) {
610 const struct got_error *err = got_error_from_errno("strdup");
617 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
618 (*obj)->pack_idx = idx;
621 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
622 (*obj)->pack_offset = offset;
627 static const struct got_error *
628 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
639 /* We do not support offset values which don't fit in 64 bit. */
641 return got_error(GOT_ERR_NO_SPACE);
645 if (delta_offset >= pack->filesize)
646 return got_error(GOT_ERR_PACK_OFFSET);
647 mapoff = (size_t)delta_offset + *len;
648 offN = *(pack->map + mapoff);
651 n = read(pack->fd, &offN, sizeof(offN));
653 return got_error_from_errno("read");
654 if (n != sizeof(offN))
655 return got_error(GOT_ERR_BAD_PACKFILE);
657 *len += sizeof(offN);
660 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
664 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
667 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
673 static const struct got_error *
674 parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
675 off_t offset, int tslen)
677 const struct got_error *err;
683 err = parse_negative_offset(&negoffset, &negofflen, pack,
688 /* Compute the base object's offset (must be in the same pack file). */
689 *base_offset = (offset - negoffset);
690 if (*base_offset <= 0)
691 return got_error(GOT_ERR_BAD_PACKFILE);
697 static const struct got_error *
698 resolve_delta_chain(struct got_delta_chain *, struct got_packidx *,
699 struct got_pack *, off_t, size_t, int, size_t, unsigned int);
701 static const struct got_error *
702 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
703 int delta_type, size_t delta_size, size_t delta_data_offset,
704 uint8_t *delta_buf, size_t delta_len)
706 struct got_delta *delta;
708 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
709 delta_data_offset, delta_buf,
712 return got_error_from_errno("got_delta_open");
713 /* delta is freed in got_object_close() */
715 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
719 static const struct got_error *
720 resolve_offset_delta(struct got_delta_chain *deltas,
721 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
722 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
725 const struct got_error *err;
730 off_t delta_data_offset;
732 size_t delta_len, consumed;
734 err = parse_offset_delta(&base_offset, &consumed, pack,
735 delta_offset, tslen);
739 delta_data_offset = delta_offset + tslen + consumed;
740 if (delta_data_offset >= pack->filesize)
741 return got_error(GOT_ERR_PACK_OFFSET);
743 if (pack->map == NULL) {
744 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
745 if (delta_data_offset == -1)
746 return got_error_from_errno("lseek");
750 size_t mapoff = (size_t)delta_data_offset;
751 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
752 mapoff, pack->filesize - mapoff);
757 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
762 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
763 delta_data_offset, delta_buf, delta_len);
767 /* An offset delta must be in the same packfile. */
768 if (base_offset >= pack->filesize)
769 return got_error(GOT_ERR_PACK_OFFSET);
771 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
776 return resolve_delta_chain(deltas, packidx, pack, base_offset,
777 base_tslen, base_type, base_size, recursion - 1);
780 static const struct got_error *
781 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
782 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
783 size_t delta_size, unsigned int recursion)
785 const struct got_error *err;
786 struct got_object_id id;
792 off_t delta_data_offset;
796 if (delta_offset >= pack->filesize)
797 return got_error(GOT_ERR_PACK_OFFSET);
798 delta_data_offset = delta_offset + tslen;
799 if (delta_data_offset >= pack->filesize)
800 return got_error(GOT_ERR_PACK_OFFSET);
802 if (pack->map == NULL) {
803 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
804 if (delta_data_offset == -1)
805 return got_error_from_errno("lseek");
809 size_t mapoff = (size_t)delta_data_offset;
810 memcpy(&id, pack->map + mapoff, sizeof(id));
811 mapoff += sizeof(id);
812 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
813 mapoff, pack->filesize - mapoff);
817 ssize_t n = read(pack->fd, &id, sizeof(id));
819 return got_error_from_errno("read");
821 return got_error(GOT_ERR_BAD_PACKFILE);
822 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
827 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
828 delta_data_offset, delta_buf, delta_len);
832 /* Delta base must be in the same pack file. */
833 idx = got_packidx_get_object_idx(packidx, &id);
835 return got_error(GOT_ERR_BAD_PACKFILE);
837 base_offset = get_object_offset(packidx, idx);
838 if (base_offset == (uint64_t)-1)
839 return got_error(GOT_ERR_BAD_PACKIDX);
841 if (base_offset >= pack->filesize)
842 return got_error(GOT_ERR_PACK_OFFSET);
844 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
849 return resolve_delta_chain(deltas, packidx, pack, base_offset,
850 base_tslen, base_type, base_size, recursion - 1);
853 static const struct got_error *
854 resolve_delta_chain(struct got_delta_chain *deltas, struct got_packidx *packidx,
855 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
856 size_t delta_size, unsigned int recursion)
858 const struct got_error *err = NULL;
860 if (--recursion == 0)
861 return got_error(GOT_ERR_RECURSION);
863 switch (delta_type) {
864 case GOT_OBJ_TYPE_COMMIT:
865 case GOT_OBJ_TYPE_TREE:
866 case GOT_OBJ_TYPE_BLOB:
867 case GOT_OBJ_TYPE_TAG:
868 /* Plain types are the final delta base. Recursion ends. */
869 err = add_delta(deltas, delta_offset, tslen, delta_type,
870 delta_size, 0, NULL, 0);
872 case GOT_OBJ_TYPE_OFFSET_DELTA:
873 err = resolve_offset_delta(deltas, packidx, pack,
874 delta_offset, tslen, delta_type, delta_size, recursion - 1);
876 case GOT_OBJ_TYPE_REF_DELTA:
877 err = resolve_ref_delta(deltas, packidx, pack,
878 delta_offset, tslen, delta_type, delta_size, recursion - 1);
881 return got_error(GOT_ERR_OBJ_TYPE);
887 static const struct got_error *
888 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
889 struct got_pack *pack, struct got_object_id *id, off_t offset,
890 size_t tslen, int delta_type, size_t delta_size, int idx)
892 const struct got_error *err = NULL;
895 *obj = calloc(1, sizeof(**obj));
897 return got_error_from_errno("calloc");
901 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
902 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
903 (*obj)->pack_offset = offset + tslen;
905 SIMPLEQ_INIT(&(*obj)->deltas.entries);
906 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
908 (*obj)->path_packfile = strdup(pack->path_packfile);
909 if ((*obj)->path_packfile == NULL) {
910 err = got_error_from_errno("strdup");
913 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
914 (*obj)->pack_idx = idx;
916 err = resolve_delta_chain(&(*obj)->deltas, packidx, pack, offset,
917 tslen, delta_type, delta_size, GOT_DELTA_CHAIN_RECURSION_MAX);
921 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
924 (*obj)->type = resolved_type;
927 got_object_close(*obj);
933 const struct got_error *
934 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
935 struct got_packidx *packidx, int idx, struct got_object_id *id)
937 const struct got_error *err = NULL;
945 offset = get_object_offset(packidx, idx);
946 if (offset == (uint64_t)-1)
947 return got_error(GOT_ERR_BAD_PACKIDX);
949 err = parse_object_type_and_size(&type, &size, &tslen, pack, offset);
954 case GOT_OBJ_TYPE_COMMIT:
955 case GOT_OBJ_TYPE_TREE:
956 case GOT_OBJ_TYPE_BLOB:
957 case GOT_OBJ_TYPE_TAG:
958 err = open_plain_object(obj, pack->path_packfile, id, type,
959 offset + tslen, size, idx);
961 case GOT_OBJ_TYPE_OFFSET_DELTA:
962 case GOT_OBJ_TYPE_REF_DELTA:
963 err = open_delta_object(obj, packidx, pack, id, offset,
964 tslen, type, size, idx);
967 err = got_error(GOT_ERR_OBJ_TYPE);
974 static const struct got_error *
975 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
977 struct got_delta *delta;
978 uint64_t base_size = 0, result_size = 0;
981 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
982 /* Plain object types are the delta base. */
983 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
984 delta->type != GOT_OBJ_TYPE_TREE &&
985 delta->type != GOT_OBJ_TYPE_BLOB &&
986 delta->type != GOT_OBJ_TYPE_TAG) {
987 const struct got_error *err;
988 err = got_delta_get_sizes(&base_size, &result_size,
989 delta->delta_buf, delta->delta_len);
993 base_size = delta->size;
994 if (base_size > *max_size)
995 *max_size = base_size;
996 if (result_size > *max_size)
997 *max_size = result_size;
1003 const struct got_error *
1004 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj)
1006 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1007 return got_error(GOT_ERR_OBJ_TYPE);
1009 return get_delta_chain_max_size(size, &obj->deltas);
1012 static const struct got_error *
1013 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1014 struct got_pack *pack, FILE *outfile, FILE *base_file, FILE *accum_file)
1016 const struct got_error *err = NULL;
1017 struct got_delta *delta;
1018 uint8_t *base_buf = NULL, *accum_buf = NULL;
1019 size_t base_bufsz = 0, accum_size = 0;
1025 if (SIMPLEQ_EMPTY(&deltas->entries))
1026 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1028 /* We process small enough files entirely in memory for speed. */
1029 err = get_delta_chain_max_size(&max_size, deltas);
1032 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1033 accum_buf = malloc(max_size);
1034 if (accum_buf == NULL)
1035 return got_error_from_errno("malloc");
1040 /* Deltas are ordered in ascending order. */
1041 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1044 off_t delta_data_offset;
1046 /* Plain object types are the delta base. */
1047 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1048 delta->type != GOT_OBJ_TYPE_TREE &&
1049 delta->type != GOT_OBJ_TYPE_BLOB &&
1050 delta->type != GOT_OBJ_TYPE_TAG) {
1051 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1055 delta_data_offset = delta->offset + delta->tslen;
1056 if (delta_data_offset >= pack->filesize) {
1057 err = got_error(GOT_ERR_PACK_OFFSET);
1060 if (pack->map == NULL) {
1061 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1063 err = got_error_from_errno("lseek");
1069 mapoff = (size_t)delta_data_offset;
1070 err = got_inflate_to_file_mmap(
1071 &base_bufsz, pack->map, mapoff,
1072 pack->filesize - mapoff, base_file);
1074 err = got_inflate_to_file_fd(
1075 &base_bufsz, pack->fd, base_file);
1078 mapoff = (size_t)delta_data_offset;
1079 err = got_inflate_to_mem_mmap(&base_buf,
1080 &base_bufsz, pack->map, mapoff,
1081 pack->filesize - mapoff);
1083 err = got_inflate_to_mem_fd(&base_buf,
1084 &base_bufsz, pack->fd);
1095 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1096 delta->delta_buf, delta->delta_len, accum_buf,
1097 &accum_size, max_size);
1100 err = got_delta_apply(base_file, delta->delta_buf,
1102 /* Final delta application writes to output file. */
1103 ++n < deltas->nentries ? accum_file : outfile,
1109 if (n < deltas->nentries) {
1110 /* Accumulated delta becomes the new base. */
1112 uint8_t *tmp = accum_buf;
1114 * Base buffer switches roles with accumulation
1115 * buffer. Ensure it can hold the largest
1116 * result in the delta chain. The initial
1117 * allocation might have been smaller.
1119 if (base_bufsz < max_size) {
1121 p = reallocarray(base_buf, 1, max_size);
1123 err = got_error_from_errno(
1128 base_bufsz = max_size;
1130 accum_buf = base_buf;
1133 FILE *tmp = accum_file;
1134 accum_file = base_file;
1145 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1147 if (len != accum_size)
1148 err = got_ferror(outfile, GOT_ERR_IO);
1152 *result_size = accum_size;
1156 static const struct got_error *
1157 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1158 struct got_delta_chain *deltas, struct got_pack *pack)
1160 const struct got_error *err = NULL;
1161 struct got_delta *delta;
1162 uint8_t *base_buf = NULL, *accum_buf = NULL;
1163 size_t base_bufsz = 0, accum_size = 0;
1170 if (SIMPLEQ_EMPTY(&deltas->entries))
1171 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1173 err = get_delta_chain_max_size(&max_size, deltas);
1176 accum_buf = malloc(max_size);
1177 if (accum_buf == NULL)
1178 return got_error_from_errno("malloc");
1180 /* Deltas are ordered in ascending order. */
1181 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1183 size_t delta_data_offset;
1185 /* Plain object types are the delta base. */
1186 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1187 delta->type != GOT_OBJ_TYPE_TREE &&
1188 delta->type != GOT_OBJ_TYPE_BLOB &&
1189 delta->type != GOT_OBJ_TYPE_TAG) {
1190 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1194 delta_data_offset = delta->offset + delta->tslen;
1195 if (delta_data_offset >= pack->filesize) {
1196 err = got_error(GOT_ERR_PACK_OFFSET);
1200 size_t mapoff = (size_t)delta_data_offset;
1201 err = got_inflate_to_mem_mmap(&base_buf,
1202 &base_bufsz, pack->map, mapoff,
1203 pack->filesize - mapoff);
1205 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1207 err = got_error_from_errno("lseek");
1210 err = got_inflate_to_mem_fd(&base_buf,
1211 &base_bufsz, pack->fd);
1219 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1220 delta->delta_buf, delta->delta_len, accum_buf,
1221 &accum_size, max_size);
1226 if (n < deltas->nentries) {
1227 /* Accumulated delta becomes the new base. */
1228 uint8_t *tmp = accum_buf;
1230 * Base buffer switches roles with accumulation buffer.
1231 * Ensure it can hold the largest result in the delta
1232 * chain. Initial allocation might have been smaller.
1234 if (base_bufsz < max_size) {
1236 p = reallocarray(base_buf, 1, max_size);
1238 err = got_error_from_errno(
1243 base_bufsz = max_size;
1245 accum_buf = base_buf;
1257 *outbuf = accum_buf;
1258 *outlen = accum_size;
1263 const struct got_error *
1264 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1265 FILE *outfile, FILE *base_file, FILE *accum_file)
1267 const struct got_error *err = NULL;
1269 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1270 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1272 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1273 if (obj->pack_offset >= pack->filesize)
1274 return got_error(GOT_ERR_PACK_OFFSET);
1277 size_t mapoff = (size_t)obj->pack_offset;
1278 err = got_inflate_to_file_mmap(&obj->size, pack->map,
1279 mapoff, pack->filesize - mapoff, outfile);
1281 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1282 return got_error_from_errno("lseek");
1283 err = got_inflate_to_file_fd(&obj->size, pack->fd,
1287 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, pack,
1288 outfile, base_file, accum_file);
1293 const struct got_error *
1294 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1295 struct got_object *obj, struct got_pack *pack)
1297 const struct got_error *err = NULL;
1299 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1300 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1302 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1303 if (obj->pack_offset >= pack->filesize)
1304 return got_error(GOT_ERR_PACK_OFFSET);
1306 size_t mapoff = (size_t)obj->pack_offset;
1307 err = got_inflate_to_mem_mmap(buf, len, pack->map,
1308 mapoff, pack->filesize - mapoff);
1310 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1311 return got_error_from_errno("lseek");
1312 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1315 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack);