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");
132 } else if (n != sizeof(*h->version)) {
133 err = got_error(GOT_ERR_BAD_PACKIDX);
137 if (betoh32(*h->version) != GOT_PACKIDX_VERSION) {
138 err = got_error(GOT_ERR_BAD_PACKIDX);
141 offset += sizeof(*h->version);
142 remain -= sizeof(*h->version);
145 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
148 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
149 if (remain < len_fanout) {
150 err = got_error(GOT_ERR_BAD_PACKIDX);
154 h->fanout_table = (uint32_t *)(p->map + offset);
156 h->fanout_table = malloc(len_fanout);
157 if (h->fanout_table == NULL) {
158 err = got_error_from_errno("malloc");
161 n = read(p->fd, h->fanout_table, len_fanout);
163 err = got_error_from_errno("read");
165 } else if (n != len_fanout) {
166 err = got_error(GOT_ERR_BAD_PACKIDX);
170 err = verify_fanout_table(h->fanout_table);
174 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
175 offset += len_fanout;
176 remain -= len_fanout;
178 nobj = betoh32(h->fanout_table[0xff]);
179 len_ids = nobj * sizeof(*h->sorted_ids);
180 if (len_ids <= nobj || len_ids > remain) {
181 err = got_error(GOT_ERR_BAD_PACKIDX);
186 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
188 h->sorted_ids = malloc(len_ids);
189 if (h->sorted_ids == NULL) {
190 err = got_error(GOT_ERR_BAD_PACKIDX);
193 n = read(p->fd, h->sorted_ids, len_ids);
195 err = got_error_from_errno("read");
196 else if (n != len_ids) {
197 err = got_error(GOT_ERR_BAD_PACKIDX);
202 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
206 if (remain < nobj * sizeof(*h->crc32)) {
207 err = got_error(GOT_ERR_BAD_PACKIDX);
211 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
213 h->crc32 = malloc(nobj * sizeof(*h->crc32));
214 if (h->crc32 == NULL) {
215 err = got_error_from_errno("malloc");
218 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
220 err = got_error_from_errno("read");
221 else if (n != nobj * sizeof(*h->crc32)) {
222 err = got_error(GOT_ERR_BAD_PACKIDX);
227 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
228 remain -= nobj * sizeof(*h->crc32);
229 offset += nobj * sizeof(*h->crc32);
231 if (remain < nobj * sizeof(*h->offsets)) {
232 err = got_error(GOT_ERR_BAD_PACKIDX);
236 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
238 h->offsets = malloc(nobj * sizeof(*h->offsets));
239 if (h->offsets == NULL) {
240 err = got_error_from_errno("malloc");
243 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
245 err = got_error_from_errno("read");
246 else if (n != nobj * sizeof(*h->offsets)) {
247 err = got_error(GOT_ERR_BAD_PACKIDX);
252 SHA1Update(&ctx, (uint8_t *)h->offsets,
253 nobj * sizeof(*h->offsets));
254 remain -= nobj * sizeof(*h->offsets);
255 offset += nobj * sizeof(*h->offsets);
257 /* Large file offsets are contained only in files > 2GB. */
258 if (p->len <= 0x80000000)
261 if (remain < nobj * sizeof(*h->large_offsets)) {
262 err = got_error(GOT_ERR_BAD_PACKIDX);
266 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
268 h->large_offsets = malloc(nobj * sizeof(*h->large_offsets));
269 if (h->large_offsets == NULL) {
270 err = got_error_from_errno("malloc");
273 n = read(p->fd, h->large_offsets,
274 nobj * sizeof(*h->large_offsets));
276 err = got_error_from_errno("read");
277 else if (n != nobj * sizeof(*h->large_offsets)) {
278 err = got_error(GOT_ERR_BAD_PACKIDX);
283 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
284 nobj * sizeof(*h->large_offsets));
285 remain -= nobj * sizeof(*h->large_offsets);
286 offset += nobj * sizeof(*h->large_offsets);
289 if (remain < sizeof(*h->trailer)) {
290 err = got_error(GOT_ERR_BAD_PACKIDX);
295 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
297 h->trailer = malloc(sizeof(*h->trailer));
298 if (h->trailer == NULL) {
299 err = got_error_from_errno("malloc");
302 n = read(p->fd, h->trailer, sizeof(*h->trailer));
304 err = got_error_from_errno("read");
305 else if (n != sizeof(*h->trailer)) {
306 err = got_error(GOT_ERR_BAD_PACKIDX);
311 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
312 SHA1Final(sha1, &ctx);
313 if (memcmp(h->trailer->packidx_sha1, sha1,
314 SHA1_DIGEST_LENGTH) != 0)
315 err = got_error(GOT_ERR_PACKIDX_CSUM);
321 const struct got_error *
322 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
324 const struct got_error *err = NULL;
325 struct got_packidx *p;
330 p = calloc(1, sizeof(*p));
332 return got_error_from_errno("calloc");
334 p->fd = open(path, O_RDONLY | O_NOFOLLOW);
336 err = got_error_from_errno2("open", path);
341 if (fstat(p->fd, &sb) != 0) {
342 err = got_error_from_errno2("fstat", path);
348 if (p->len < sizeof(p->hdr)) {
349 err = got_error(GOT_ERR_BAD_PACKIDX);
355 p->path_packidx = strdup(path);
356 if (p->path_packidx == NULL) {
357 err = got_error_from_errno("strdup");
361 #ifndef GOT_PACK_NO_MMAP
362 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
363 if (p->map == MAP_FAILED) {
364 if (errno != ENOMEM) {
365 err = got_error_from_errno("mmap");
368 p->map = NULL; /* fall back to read(2) */
372 err = got_packidx_init_hdr(p, verify);
375 got_packidx_close(p);
382 const struct got_error *
383 got_packidx_close(struct got_packidx *packidx)
385 const struct got_error *err = NULL;
387 free(packidx->path_packidx);
389 if (munmap(packidx->map, packidx->len) == -1)
390 err = got_error_from_errno("munmap");
392 free(packidx->hdr.magic);
393 free(packidx->hdr.version);
394 free(packidx->hdr.fanout_table);
395 free(packidx->hdr.sorted_ids);
396 free(packidx->hdr.crc32);
397 free(packidx->hdr.offsets);
398 free(packidx->hdr.large_offsets);
399 free(packidx->hdr.trailer);
401 if (close(packidx->fd) != 0 && err == NULL)
402 err = got_error_from_errno("close");
409 get_object_offset(struct got_packidx *packidx, int idx)
411 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
412 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
413 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
415 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
416 if (idx < 0 || idx > totobj ||
417 packidx->hdr.large_offsets == NULL)
419 loffset = betoh64(packidx->hdr.large_offsets[idx]);
420 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
422 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
426 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
428 u_int8_t id0 = id->sha1[0];
429 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
430 int left = 0, right = totobj - 1;
433 left = betoh32(packidx->hdr.fanout_table[id0 - 1]);
435 while (left <= right) {
436 struct got_packidx_object_id *oid;
439 i = ((left + right) / 2);
440 oid = &packidx->hdr.sorted_ids[i];
441 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
453 const struct got_error *
454 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
455 struct got_packidx *packidx, const char *id_str_prefix)
457 const struct got_error *err = NULL;
459 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
461 size_t prefix_len = strlen(id_str_prefix);
462 struct got_packidx_object_id *oid;
465 SIMPLEQ_INIT(matched_ids);
468 return got_error(GOT_ERR_BAD_OBJ_ID_STR);
470 hex[0] = id_str_prefix[0];
471 hex[1] = id_str_prefix[1];
473 if (!got_parse_xdigit(&id0, hex))
474 return got_error(GOT_ERR_BAD_OBJ_ID_STR);
476 i = betoh32(packidx->hdr.fanout_table[id0 - 1]);
480 oid = &packidx->hdr.sorted_ids[i];
481 while (i < totobj && oid->sha1[0] == id0) {
482 char id_str[SHA1_DIGEST_STRING_LENGTH];
483 struct got_object_qid *qid;
486 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
487 return got_error(GOT_ERR_NO_SPACE);
489 cmp = strncmp(id_str, id_str_prefix, prefix_len);
491 oid = &packidx->hdr.sorted_ids[++i];
496 err = got_object_qid_alloc_partial(&qid);
499 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
500 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
502 oid = &packidx->hdr.sorted_ids[++i];
506 got_object_id_queue_free(matched_ids);
510 const struct got_error *
511 got_pack_stop_privsep_child(struct got_pack *pack)
513 const struct got_error *err = NULL;
515 if (pack->privsep_child == NULL)
518 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
521 err = got_privsep_wait_for_child(pack->privsep_child->pid);
522 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
523 err = got_error_from_errno("close");
524 free(pack->privsep_child);
525 pack->privsep_child = NULL;
529 const struct got_error *
530 got_pack_close(struct got_pack *pack)
532 const struct got_error *err = NULL;
534 err = got_pack_stop_privsep_child(pack);
535 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
536 err = got_error_from_errno("munmap");
537 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
538 err = got_error_from_errno("close");
540 free(pack->path_packfile);
541 pack->path_packfile = NULL;
547 static const struct got_error *
548 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
549 struct got_pack *pack, off_t offset)
559 if (offset >= pack->filesize)
560 return got_error(GOT_ERR_PACK_OFFSET);
563 mapoff = (size_t)offset;
565 if (lseek(pack->fd, offset, SEEK_SET) == -1)
566 return got_error_from_errno("lseek");
570 /* We do not support size values which don't fit in 64 bit. */
572 return got_error(GOT_ERR_NO_SPACE);
575 sizeN = *(pack->map + mapoff);
576 mapoff += sizeof(sizeN);
578 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
580 return got_error_from_errno("read");
581 if (n != sizeof(sizeN))
582 return got_error(GOT_ERR_BAD_PACKFILE);
584 *len += sizeof(sizeN);
587 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
588 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
589 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
591 size_t shift = 4 + 7 * (i - 1);
592 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
595 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
602 static const struct got_error *
603 open_plain_object(struct got_object **obj, const char *path_packfile,
604 struct got_object_id *id, uint8_t type, off_t offset, size_t size, int idx)
606 *obj = calloc(1, sizeof(**obj));
608 return got_error_from_errno("calloc");
610 (*obj)->path_packfile = strdup(path_packfile);
611 if ((*obj)->path_packfile == NULL) {
612 const struct got_error *err = got_error_from_errno("strdup");
619 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
620 (*obj)->pack_idx = idx;
623 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
624 (*obj)->pack_offset = offset;
629 static const struct got_error *
630 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
641 /* We do not support offset values which don't fit in 64 bit. */
643 return got_error(GOT_ERR_NO_SPACE);
647 if (delta_offset >= pack->filesize)
648 return got_error(GOT_ERR_PACK_OFFSET);
649 mapoff = (size_t)delta_offset + *len;
650 offN = *(pack->map + mapoff);
653 n = read(pack->fd, &offN, sizeof(offN));
655 return got_error_from_errno("read");
656 if (n != sizeof(offN))
657 return got_error(GOT_ERR_BAD_PACKFILE);
659 *len += sizeof(offN);
662 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
666 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
669 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
675 static const struct got_error *
676 parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
677 off_t offset, int tslen)
679 const struct got_error *err;
685 err = parse_negative_offset(&negoffset, &negofflen, pack,
690 /* Compute the base object's offset (must be in the same pack file). */
691 *base_offset = (offset - negoffset);
692 if (*base_offset <= 0)
693 return got_error(GOT_ERR_BAD_PACKFILE);
699 static const struct got_error *
700 resolve_delta_chain(struct got_delta_chain *, struct got_packidx *,
701 struct got_pack *, off_t, size_t, int, size_t, unsigned int);
703 static const struct got_error *
704 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
705 int delta_type, size_t delta_size, size_t delta_data_offset,
706 uint8_t *delta_buf, size_t delta_len)
708 struct got_delta *delta;
710 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
711 delta_data_offset, delta_buf,
714 return got_error_from_errno("got_delta_open");
715 /* delta is freed in got_object_close() */
717 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
721 static const struct got_error *
722 resolve_offset_delta(struct got_delta_chain *deltas,
723 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
724 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
727 const struct got_error *err;
732 off_t delta_data_offset;
734 size_t delta_len, consumed;
736 err = parse_offset_delta(&base_offset, &consumed, pack,
737 delta_offset, tslen);
741 delta_data_offset = delta_offset + tslen + consumed;
742 if (delta_data_offset >= pack->filesize)
743 return got_error(GOT_ERR_PACK_OFFSET);
745 if (pack->map == NULL) {
746 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
747 if (delta_data_offset == -1)
748 return got_error_from_errno("lseek");
752 size_t mapoff = (size_t)delta_data_offset;
753 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
754 mapoff, pack->filesize - mapoff);
759 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
764 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
765 delta_data_offset, delta_buf, delta_len);
769 /* An offset delta must be in the same packfile. */
770 if (base_offset >= pack->filesize)
771 return got_error(GOT_ERR_PACK_OFFSET);
773 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
778 return resolve_delta_chain(deltas, packidx, pack, base_offset,
779 base_tslen, base_type, base_size, recursion - 1);
782 static const struct got_error *
783 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
784 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
785 size_t delta_size, unsigned int recursion)
787 const struct got_error *err;
788 struct got_object_id id;
794 off_t delta_data_offset;
798 if (delta_offset >= pack->filesize)
799 return got_error(GOT_ERR_PACK_OFFSET);
800 delta_data_offset = delta_offset + tslen;
801 if (delta_data_offset >= pack->filesize)
802 return got_error(GOT_ERR_PACK_OFFSET);
804 if (pack->map == NULL) {
805 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
806 if (delta_data_offset == -1)
807 return got_error_from_errno("lseek");
811 size_t mapoff = (size_t)delta_data_offset;
812 memcpy(&id, pack->map + mapoff, sizeof(id));
813 mapoff += sizeof(id);
814 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
815 mapoff, pack->filesize - mapoff);
819 ssize_t n = read(pack->fd, &id, sizeof(id));
821 return got_error_from_errno("read");
823 return got_error(GOT_ERR_BAD_PACKFILE);
824 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
829 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
830 delta_data_offset, delta_buf, delta_len);
834 /* Delta base must be in the same pack file. */
835 idx = got_packidx_get_object_idx(packidx, &id);
837 return got_error(GOT_ERR_BAD_PACKFILE);
839 base_offset = get_object_offset(packidx, idx);
840 if (base_offset == (uint64_t)-1)
841 return got_error(GOT_ERR_BAD_PACKIDX);
843 if (base_offset >= pack->filesize)
844 return got_error(GOT_ERR_PACK_OFFSET);
846 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
851 return resolve_delta_chain(deltas, packidx, pack, base_offset,
852 base_tslen, base_type, base_size, recursion - 1);
855 static const struct got_error *
856 resolve_delta_chain(struct got_delta_chain *deltas, struct got_packidx *packidx,
857 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
858 size_t delta_size, unsigned int recursion)
860 const struct got_error *err = NULL;
862 if (--recursion == 0)
863 return got_error(GOT_ERR_RECURSION);
865 switch (delta_type) {
866 case GOT_OBJ_TYPE_COMMIT:
867 case GOT_OBJ_TYPE_TREE:
868 case GOT_OBJ_TYPE_BLOB:
869 case GOT_OBJ_TYPE_TAG:
870 /* Plain types are the final delta base. Recursion ends. */
871 err = add_delta(deltas, delta_offset, tslen, delta_type,
872 delta_size, 0, NULL, 0);
874 case GOT_OBJ_TYPE_OFFSET_DELTA:
875 err = resolve_offset_delta(deltas, packidx, pack,
876 delta_offset, tslen, delta_type, delta_size, recursion - 1);
878 case GOT_OBJ_TYPE_REF_DELTA:
879 err = resolve_ref_delta(deltas, packidx, pack,
880 delta_offset, tslen, delta_type, delta_size, recursion - 1);
883 return got_error(GOT_ERR_OBJ_TYPE);
889 static const struct got_error *
890 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
891 struct got_pack *pack, struct got_object_id *id, off_t offset,
892 size_t tslen, int delta_type, size_t delta_size, int idx)
894 const struct got_error *err = NULL;
897 *obj = calloc(1, sizeof(**obj));
899 return got_error_from_errno("calloc");
903 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
904 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
905 (*obj)->pack_offset = offset + tslen;
907 SIMPLEQ_INIT(&(*obj)->deltas.entries);
908 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
910 (*obj)->path_packfile = strdup(pack->path_packfile);
911 if ((*obj)->path_packfile == NULL) {
912 err = got_error_from_errno("strdup");
915 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
916 (*obj)->pack_idx = idx;
918 err = resolve_delta_chain(&(*obj)->deltas, packidx, pack, offset,
919 tslen, delta_type, delta_size, GOT_DELTA_CHAIN_RECURSION_MAX);
923 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
926 (*obj)->type = resolved_type;
929 got_object_close(*obj);
935 const struct got_error *
936 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
937 struct got_packidx *packidx, int idx, struct got_object_id *id)
939 const struct got_error *err = NULL;
947 offset = get_object_offset(packidx, idx);
948 if (offset == (uint64_t)-1)
949 return got_error(GOT_ERR_BAD_PACKIDX);
951 err = parse_object_type_and_size(&type, &size, &tslen, pack, offset);
956 case GOT_OBJ_TYPE_COMMIT:
957 case GOT_OBJ_TYPE_TREE:
958 case GOT_OBJ_TYPE_BLOB:
959 case GOT_OBJ_TYPE_TAG:
960 err = open_plain_object(obj, pack->path_packfile, id, type,
961 offset + tslen, size, idx);
963 case GOT_OBJ_TYPE_OFFSET_DELTA:
964 case GOT_OBJ_TYPE_REF_DELTA:
965 err = open_delta_object(obj, packidx, pack, id, offset,
966 tslen, type, size, idx);
969 err = got_error(GOT_ERR_OBJ_TYPE);
976 static const struct got_error *
977 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
979 struct got_delta *delta;
980 uint64_t base_size = 0, result_size = 0;
983 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
984 /* Plain object types are the delta base. */
985 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
986 delta->type != GOT_OBJ_TYPE_TREE &&
987 delta->type != GOT_OBJ_TYPE_BLOB &&
988 delta->type != GOT_OBJ_TYPE_TAG) {
989 const struct got_error *err;
990 err = got_delta_get_sizes(&base_size, &result_size,
991 delta->delta_buf, delta->delta_len);
995 base_size = delta->size;
996 if (base_size > *max_size)
997 *max_size = base_size;
998 if (result_size > *max_size)
999 *max_size = result_size;
1005 const struct got_error *
1006 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj)
1008 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1009 return got_error(GOT_ERR_OBJ_TYPE);
1011 return get_delta_chain_max_size(size, &obj->deltas);
1014 static const struct got_error *
1015 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1016 struct got_pack *pack, FILE *outfile, FILE *base_file, FILE *accum_file)
1018 const struct got_error *err = NULL;
1019 struct got_delta *delta;
1020 uint8_t *base_buf = NULL, *accum_buf = NULL;
1021 size_t base_bufsz = 0, accum_size = 0;
1027 if (SIMPLEQ_EMPTY(&deltas->entries))
1028 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1030 /* We process small enough files entirely in memory for speed. */
1031 err = get_delta_chain_max_size(&max_size, deltas);
1034 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1035 accum_buf = malloc(max_size);
1036 if (accum_buf == NULL)
1037 return got_error_from_errno("malloc");
1042 /* Deltas are ordered in ascending order. */
1043 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1046 off_t delta_data_offset;
1048 /* Plain object types are the delta base. */
1049 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1050 delta->type != GOT_OBJ_TYPE_TREE &&
1051 delta->type != GOT_OBJ_TYPE_BLOB &&
1052 delta->type != GOT_OBJ_TYPE_TAG) {
1053 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1057 delta_data_offset = delta->offset + delta->tslen;
1058 if (delta_data_offset >= pack->filesize) {
1059 err = got_error(GOT_ERR_PACK_OFFSET);
1062 if (pack->map == NULL) {
1063 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1065 err = got_error_from_errno("lseek");
1071 mapoff = (size_t)delta_data_offset;
1072 err = got_inflate_to_file_mmap(
1073 &base_bufsz, pack->map, mapoff,
1074 pack->filesize - mapoff, base_file);
1076 err = got_inflate_to_file_fd(
1077 &base_bufsz, pack->fd, base_file);
1080 mapoff = (size_t)delta_data_offset;
1081 err = got_inflate_to_mem_mmap(&base_buf,
1082 &base_bufsz, pack->map, mapoff,
1083 pack->filesize - mapoff);
1085 err = got_inflate_to_mem_fd(&base_buf,
1086 &base_bufsz, pack->fd);
1097 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1098 delta->delta_buf, delta->delta_len, accum_buf,
1099 &accum_size, max_size);
1102 err = got_delta_apply(base_file, delta->delta_buf,
1104 /* Final delta application writes to output file. */
1105 ++n < deltas->nentries ? accum_file : outfile,
1111 if (n < deltas->nentries) {
1112 /* Accumulated delta becomes the new base. */
1114 uint8_t *tmp = accum_buf;
1116 * Base buffer switches roles with accumulation
1117 * buffer. Ensure it can hold the largest
1118 * result in the delta chain. The initial
1119 * allocation might have been smaller.
1121 if (base_bufsz < max_size) {
1123 p = reallocarray(base_buf, 1, max_size);
1125 err = got_error_from_errno(
1130 base_bufsz = max_size;
1132 accum_buf = base_buf;
1135 FILE *tmp = accum_file;
1136 accum_file = base_file;
1147 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1149 if (len != accum_size)
1150 err = got_ferror(outfile, GOT_ERR_IO);
1154 *result_size = accum_size;
1158 static const struct got_error *
1159 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1160 struct got_delta_chain *deltas, struct got_pack *pack)
1162 const struct got_error *err = NULL;
1163 struct got_delta *delta;
1164 uint8_t *base_buf = NULL, *accum_buf = NULL;
1165 size_t base_bufsz = 0, accum_size = 0;
1172 if (SIMPLEQ_EMPTY(&deltas->entries))
1173 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1175 err = get_delta_chain_max_size(&max_size, deltas);
1178 accum_buf = malloc(max_size);
1179 if (accum_buf == NULL)
1180 return got_error_from_errno("malloc");
1182 /* Deltas are ordered in ascending order. */
1183 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1185 size_t delta_data_offset;
1187 /* Plain object types are the delta base. */
1188 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1189 delta->type != GOT_OBJ_TYPE_TREE &&
1190 delta->type != GOT_OBJ_TYPE_BLOB &&
1191 delta->type != GOT_OBJ_TYPE_TAG) {
1192 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1196 delta_data_offset = delta->offset + delta->tslen;
1197 if (delta_data_offset >= pack->filesize) {
1198 err = got_error(GOT_ERR_PACK_OFFSET);
1202 size_t mapoff = (size_t)delta_data_offset;
1203 err = got_inflate_to_mem_mmap(&base_buf,
1204 &base_bufsz, pack->map, mapoff,
1205 pack->filesize - mapoff);
1207 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1209 err = got_error_from_errno("lseek");
1212 err = got_inflate_to_mem_fd(&base_buf,
1213 &base_bufsz, pack->fd);
1221 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1222 delta->delta_buf, delta->delta_len, accum_buf,
1223 &accum_size, max_size);
1228 if (n < deltas->nentries) {
1229 /* Accumulated delta becomes the new base. */
1230 uint8_t *tmp = accum_buf;
1232 * Base buffer switches roles with accumulation buffer.
1233 * Ensure it can hold the largest result in the delta
1234 * chain. Initial allocation might have been smaller.
1236 if (base_bufsz < max_size) {
1238 p = reallocarray(base_buf, 1, max_size);
1240 err = got_error_from_errno(
1245 base_bufsz = max_size;
1247 accum_buf = base_buf;
1259 *outbuf = accum_buf;
1260 *outlen = accum_size;
1265 const struct got_error *
1266 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1267 FILE *outfile, FILE *base_file, FILE *accum_file)
1269 const struct got_error *err = NULL;
1271 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1272 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1274 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1275 if (obj->pack_offset >= pack->filesize)
1276 return got_error(GOT_ERR_PACK_OFFSET);
1279 size_t mapoff = (size_t)obj->pack_offset;
1280 err = got_inflate_to_file_mmap(&obj->size, pack->map,
1281 mapoff, pack->filesize - mapoff, outfile);
1283 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1284 return got_error_from_errno("lseek");
1285 err = got_inflate_to_file_fd(&obj->size, pack->fd,
1289 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, pack,
1290 outfile, base_file, accum_file);
1295 const struct got_error *
1296 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1297 struct got_object *obj, struct got_pack *pack)
1299 const struct got_error *err = NULL;
1301 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1302 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1304 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1305 if (obj->pack_offset >= pack->filesize)
1306 return got_error(GOT_ERR_PACK_OFFSET);
1308 size_t mapoff = (size_t)obj->pack_offset;
1309 err = got_inflate_to_mem_mmap(buf, len, pack->map,
1310 mapoff, pack->filesize - mapoff);
1312 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1313 return got_error_from_errno("lseek");
1314 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1317 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack);