2 * Copyright (c) 2018, 2019, 2020 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>
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_opentemp.h"
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_delta_cache.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
51 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
58 static const struct got_error *
59 verify_fanout_table(uint32_t *fanout_table)
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);
71 const struct got_error *
72 got_packidx_init_hdr(struct got_packidx *p, int verify)
74 const struct got_error *err = NULL;
75 struct got_packidx_v2_hdr *h;
77 uint8_t sha1[SHA1_DIGEST_LENGTH];
78 size_t nobj, len_fanout, len_ids, offset, remain;
88 if (remain < sizeof(*h->magic)) {
89 err = got_error(GOT_ERR_BAD_PACKIDX);
93 h->magic = (uint32_t *)(p->map + offset);
95 h->magic = malloc(sizeof(*h->magic));
96 if (h->magic == NULL) {
97 err = got_error_from_errno("malloc");
100 n = read(p->fd, h->magic, sizeof(*h->magic));
102 err = got_error_from_errno("read");
104 } else if (n != sizeof(*h->magic)) {
105 err = got_error(GOT_ERR_BAD_PACKIDX);
109 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
110 err = got_error(GOT_ERR_BAD_PACKIDX);
113 offset += sizeof(*h->magic);
114 remain -= sizeof(*h->magic);
117 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
119 if (remain < sizeof(*h->version)) {
120 err = got_error(GOT_ERR_BAD_PACKIDX);
124 h->version = (uint32_t *)(p->map + offset);
126 h->version = malloc(sizeof(*h->version));
127 if (h->version == NULL) {
128 err = got_error_from_errno("malloc");
131 n = read(p->fd, h->version, sizeof(*h->version));
133 err = got_error_from_errno("read");
135 } else if (n != sizeof(*h->version)) {
136 err = got_error(GOT_ERR_BAD_PACKIDX);
140 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
141 err = got_error(GOT_ERR_BAD_PACKIDX);
144 offset += sizeof(*h->version);
145 remain -= sizeof(*h->version);
148 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
151 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
152 if (remain < len_fanout) {
153 err = got_error(GOT_ERR_BAD_PACKIDX);
157 h->fanout_table = (uint32_t *)(p->map + offset);
159 h->fanout_table = malloc(len_fanout);
160 if (h->fanout_table == NULL) {
161 err = got_error_from_errno("malloc");
164 n = read(p->fd, h->fanout_table, len_fanout);
166 err = got_error_from_errno("read");
168 } else if (n != len_fanout) {
169 err = got_error(GOT_ERR_BAD_PACKIDX);
173 err = verify_fanout_table(h->fanout_table);
177 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
178 offset += len_fanout;
179 remain -= len_fanout;
181 nobj = be32toh(h->fanout_table[0xff]);
182 len_ids = nobj * sizeof(*h->sorted_ids);
183 if (len_ids <= nobj || len_ids > remain) {
184 err = got_error(GOT_ERR_BAD_PACKIDX);
189 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
191 h->sorted_ids = malloc(len_ids);
192 if (h->sorted_ids == NULL) {
193 err = got_error(GOT_ERR_BAD_PACKIDX);
196 n = read(p->fd, h->sorted_ids, len_ids);
198 err = got_error_from_errno("read");
199 else if (n != len_ids) {
200 err = got_error(GOT_ERR_BAD_PACKIDX);
205 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
209 if (remain < nobj * sizeof(*h->crc32)) {
210 err = got_error(GOT_ERR_BAD_PACKIDX);
214 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
216 h->crc32 = malloc(nobj * sizeof(*h->crc32));
217 if (h->crc32 == NULL) {
218 err = got_error_from_errno("malloc");
221 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
223 err = got_error_from_errno("read");
224 else if (n != nobj * sizeof(*h->crc32)) {
225 err = got_error(GOT_ERR_BAD_PACKIDX);
230 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
231 remain -= nobj * sizeof(*h->crc32);
232 offset += nobj * sizeof(*h->crc32);
234 if (remain < nobj * sizeof(*h->offsets)) {
235 err = got_error(GOT_ERR_BAD_PACKIDX);
239 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
241 h->offsets = malloc(nobj * sizeof(*h->offsets));
242 if (h->offsets == NULL) {
243 err = got_error_from_errno("malloc");
246 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
248 err = got_error_from_errno("read");
249 else if (n != nobj * sizeof(*h->offsets)) {
250 err = got_error(GOT_ERR_BAD_PACKIDX);
255 SHA1Update(&ctx, (uint8_t *)h->offsets,
256 nobj * sizeof(*h->offsets));
257 remain -= nobj * sizeof(*h->offsets);
258 offset += nobj * sizeof(*h->offsets);
260 /* Large file offsets are contained only in files > 2GB. */
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))
266 if (p->nlargeobj == 0)
269 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
274 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
276 h->large_offsets = malloc(p->nlargeobj *
277 sizeof(*h->large_offsets));
278 if (h->large_offsets == NULL) {
279 err = got_error_from_errno("malloc");
282 n = read(p->fd, h->large_offsets,
283 p->nlargeobj * sizeof(*h->large_offsets));
285 err = got_error_from_errno("read");
286 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
287 err = got_error(GOT_ERR_BAD_PACKIDX);
292 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
293 p->nlargeobj * sizeof(*h->large_offsets));
294 remain -= p->nlargeobj * sizeof(*h->large_offsets);
295 offset += p->nlargeobj * sizeof(*h->large_offsets);
298 if (remain < sizeof(*h->trailer)) {
299 err = got_error(GOT_ERR_BAD_PACKIDX);
304 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
306 h->trailer = malloc(sizeof(*h->trailer));
307 if (h->trailer == NULL) {
308 err = got_error_from_errno("malloc");
311 n = read(p->fd, h->trailer, sizeof(*h->trailer));
313 err = got_error_from_errno("read");
314 else if (n != sizeof(*h->trailer)) {
315 err = got_error(GOT_ERR_BAD_PACKIDX);
320 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
321 SHA1Final(sha1, &ctx);
322 if (memcmp(h->trailer->packidx_sha1, sha1,
323 SHA1_DIGEST_LENGTH) != 0)
324 err = got_error(GOT_ERR_PACKIDX_CSUM);
330 const struct got_error *
331 got_packidx_open(struct got_packidx **packidx,
332 int dir_fd, const char *relpath, int verify)
334 const struct got_error *err = NULL;
335 struct got_packidx *p = NULL;
341 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
346 * Ensure that a corresponding pack file exists.
347 * Some Git repositories have this problem. Git seems to ignore
348 * the existence of lonely pack index files but we do not.
350 if (fstatat(dir_fd, pack_relpath, &sb, 0) == -1) {
351 if (errno == ENOENT) {
352 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
355 err = got_error_from_errno2("fstatat", pack_relpath);
359 p = calloc(1, sizeof(*p));
361 err = got_error_from_errno("calloc");
365 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW);
367 err = got_error_from_errno2("openat", relpath);
372 if (fstat(p->fd, &sb) != 0) {
373 err = got_error_from_errno2("fstat", relpath);
379 if (p->len < sizeof(p->hdr)) {
380 err = got_error(GOT_ERR_BAD_PACKIDX);
386 p->path_packidx = strdup(relpath);
387 if (p->path_packidx == NULL) {
388 err = got_error_from_errno("strdup");
392 #ifndef GOT_PACK_NO_MMAP
393 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
394 if (p->map == MAP_FAILED) {
395 if (errno != ENOMEM) {
396 err = got_error_from_errno("mmap");
399 p->map = NULL; /* fall back to read(2) */
403 err = got_packidx_init_hdr(p, verify);
407 got_packidx_close(p);
414 const struct got_error *
415 got_packidx_close(struct got_packidx *packidx)
417 const struct got_error *err = NULL;
419 free(packidx->path_packidx);
421 if (munmap(packidx->map, packidx->len) == -1)
422 err = got_error_from_errno("munmap");
424 free(packidx->hdr.magic);
425 free(packidx->hdr.version);
426 free(packidx->hdr.fanout_table);
427 free(packidx->hdr.sorted_ids);
428 free(packidx->hdr.crc32);
429 free(packidx->hdr.offsets);
430 free(packidx->hdr.large_offsets);
431 free(packidx->hdr.trailer);
433 if (close(packidx->fd) == -1 && err == NULL)
434 err = got_error_from_errno("close");
440 const struct got_error *
441 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
445 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
446 size = strlen(path_packidx) + 2;
447 if (size < GOT_PACKFILE_NAMELEN + 1)
448 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
450 *path_packfile = malloc(size);
451 if (*path_packfile == NULL)
452 return got_error_from_errno("malloc");
454 /* Copy up to and excluding ".idx". */
455 if (strlcpy(*path_packfile, path_packidx,
456 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
457 return got_error(GOT_ERR_NO_SPACE);
459 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
460 return got_error(GOT_ERR_NO_SPACE);
466 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
468 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
469 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
471 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
472 if (idx < 0 || idx >= packidx->nlargeobj ||
473 packidx->hdr.large_offsets == NULL)
475 loffset = be64toh(packidx->hdr.large_offsets[idx]);
476 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
478 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
482 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
484 u_int8_t id0 = id->sha1[0];
485 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
486 int left = 0, right = totobj - 1;
489 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
491 while (left <= right) {
492 struct got_packidx_object_id *oid;
495 i = ((left + right) / 2);
496 oid = &packidx->hdr.sorted_ids[i];
497 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
509 const struct got_error *
510 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
511 struct got_packidx *packidx, const char *id_str_prefix)
513 const struct got_error *err = NULL;
515 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
517 size_t prefix_len = strlen(id_str_prefix);
518 struct got_packidx_object_id *oid;
521 STAILQ_INIT(matched_ids);
524 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
526 hex[0] = id_str_prefix[0];
527 hex[1] = id_str_prefix[1];
529 if (!got_parse_xdigit(&id0, hex))
530 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
532 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
533 oid = &packidx->hdr.sorted_ids[i];
534 while (i < totobj && oid->sha1[0] == id0) {
535 char id_str[SHA1_DIGEST_STRING_LENGTH];
536 struct got_object_qid *qid;
539 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
540 return got_error(GOT_ERR_NO_SPACE);
542 cmp = strncmp(id_str, id_str_prefix, prefix_len);
544 oid = &packidx->hdr.sorted_ids[++i];
549 err = got_object_qid_alloc_partial(&qid);
552 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
553 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
555 oid = &packidx->hdr.sorted_ids[++i];
559 got_object_id_queue_free(matched_ids);
563 static const struct got_error *
564 pack_stop_privsep_child(struct got_pack *pack)
566 const struct got_error *err = NULL;
568 if (pack->privsep_child == NULL)
571 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
574 err = got_privsep_wait_for_child(pack->privsep_child->pid);
575 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
576 err = got_error_from_errno("close");
577 imsg_clear(pack->privsep_child->ibuf);
578 free(pack->privsep_child->ibuf);
579 free(pack->privsep_child);
580 pack->privsep_child = NULL;
584 const struct got_error *
585 got_pack_close(struct got_pack *pack)
587 const struct got_error *err = NULL;
589 err = pack_stop_privsep_child(pack);
590 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
591 err = got_error_from_errno("munmap");
592 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
593 err = got_error_from_errno("close");
595 free(pack->path_packfile);
596 pack->path_packfile = NULL;
598 if (pack->delta_cache) {
599 got_delta_cache_free(pack->delta_cache);
600 pack->delta_cache = NULL;
606 const struct got_error *
607 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
608 struct got_pack *pack, off_t offset)
618 if (offset >= pack->filesize)
619 return got_error(GOT_ERR_PACK_OFFSET);
622 mapoff = (size_t)offset;
624 if (lseek(pack->fd, offset, SEEK_SET) == -1)
625 return got_error_from_errno("lseek");
629 /* We do not support size values which don't fit in 64 bit. */
631 return got_error(GOT_ERR_NO_SPACE);
634 sizeN = *(pack->map + mapoff);
635 mapoff += sizeof(sizeN);
637 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
639 return got_error_from_errno("read");
640 if (n != sizeof(sizeN))
641 return got_error(GOT_ERR_BAD_PACKFILE);
643 *len += sizeof(sizeN);
646 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
647 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
648 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
650 size_t shift = 4 + 7 * (i - 1);
651 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
654 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
661 static const struct got_error *
662 open_plain_object(struct got_object **obj, struct got_object_id *id,
663 uint8_t type, off_t offset, size_t size, int idx)
665 *obj = calloc(1, sizeof(**obj));
667 return got_error_from_errno("calloc");
670 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
671 (*obj)->pack_idx = idx;
674 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
675 (*obj)->pack_offset = offset;
680 static const struct got_error *
681 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
692 /* We do not support offset values which don't fit in 64 bit. */
694 return got_error(GOT_ERR_NO_SPACE);
698 if (delta_offset >= pack->filesize)
699 return got_error(GOT_ERR_PACK_OFFSET);
700 mapoff = (size_t)delta_offset + *len;
701 offN = *(pack->map + mapoff);
704 n = read(pack->fd, &offN, sizeof(offN));
706 return got_error_from_errno("read");
707 if (n != sizeof(offN))
708 return got_error(GOT_ERR_BAD_PACKFILE);
710 *len += sizeof(offN);
713 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
717 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
720 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
726 const struct got_error *
727 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
728 off_t offset, int tslen)
730 const struct got_error *err;
736 err = parse_negative_offset(&negoffset, &negofflen, pack,
741 /* Compute the base object's offset (must be in the same pack file). */
742 *base_offset = (offset - negoffset);
743 if (*base_offset <= 0)
744 return got_error(GOT_ERR_BAD_PACKFILE);
750 static const struct got_error *
751 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
752 size_t delta_data_offset, struct got_pack *pack)
754 const struct got_error *err = NULL;
757 if (delta_data_offset >= pack->filesize)
758 return got_error(GOT_ERR_PACK_OFFSET);
759 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
760 NULL, NULL, pack->map, delta_data_offset,
761 pack->filesize - delta_data_offset);
763 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
764 return got_error_from_errno("lseek");
765 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
771 static const struct got_error *
772 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
773 int delta_type, size_t delta_size, size_t delta_data_offset)
775 struct got_delta *delta;
777 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
780 return got_error_from_errno("got_delta_open");
781 /* delta is freed in got_object_close() */
783 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
787 static const struct got_error *
788 resolve_offset_delta(struct got_delta_chain *deltas,
789 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
790 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
793 const struct got_error *err;
798 off_t delta_data_offset;
801 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
802 delta_offset, tslen);
806 delta_data_offset = delta_offset + tslen + consumed;
807 if (delta_data_offset >= pack->filesize)
808 return got_error(GOT_ERR_PACK_OFFSET);
810 if (pack->map == NULL) {
811 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
812 if (delta_data_offset == -1)
813 return got_error_from_errno("lseek");
816 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
821 /* An offset delta must be in the same packfile. */
822 if (base_offset >= pack->filesize)
823 return got_error(GOT_ERR_PACK_OFFSET);
825 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
826 &base_tslen, pack, base_offset);
830 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
831 base_tslen, base_type, base_size, recursion - 1);
834 const struct got_error *
835 got_pack_parse_ref_delta(struct got_object_id *id,
836 struct got_pack *pack, off_t delta_offset, int tslen)
839 size_t mapoff = delta_offset + tslen;
840 memcpy(id, pack->map + mapoff, sizeof(*id));
843 n = read(pack->fd, id, sizeof(*id));
845 return got_error_from_errno("read");
846 if (n != sizeof(*id))
847 return got_error(GOT_ERR_BAD_PACKFILE);
853 static const struct got_error *
854 resolve_ref_delta(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;
859 struct got_object_id id;
865 off_t delta_data_offset;
867 if (delta_offset + tslen >= pack->filesize)
868 return got_error(GOT_ERR_PACK_OFFSET);
870 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
874 delta_data_offset = delta_offset + tslen + sizeof(id);
876 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
877 if (delta_data_offset == -1)
878 return got_error_from_errno("lseek");
881 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
886 /* Delta base must be in the same pack file. */
887 idx = got_packidx_get_object_idx(packidx, &id);
889 return got_error(GOT_ERR_NO_OBJ);
891 base_offset = got_packidx_get_object_offset(packidx, idx);
892 if (base_offset == (uint64_t)-1)
893 return got_error(GOT_ERR_BAD_PACKIDX);
895 if (base_offset >= pack->filesize)
896 return got_error(GOT_ERR_PACK_OFFSET);
898 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
899 &base_tslen, pack, base_offset);
903 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
904 base_tslen, base_type, base_size, recursion - 1);
907 const struct got_error *
908 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
909 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
910 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
912 const struct got_error *err = NULL;
914 if (--recursion == 0)
915 return got_error(GOT_ERR_RECURSION);
917 switch (delta_type) {
918 case GOT_OBJ_TYPE_COMMIT:
919 case GOT_OBJ_TYPE_TREE:
920 case GOT_OBJ_TYPE_BLOB:
921 case GOT_OBJ_TYPE_TAG:
922 /* Plain types are the final delta base. Recursion ends. */
923 err = add_delta(deltas, delta_offset, tslen, delta_type,
926 case GOT_OBJ_TYPE_OFFSET_DELTA:
927 err = resolve_offset_delta(deltas, packidx, pack,
928 delta_offset, tslen, delta_type, delta_size, recursion - 1);
930 case GOT_OBJ_TYPE_REF_DELTA:
931 err = resolve_ref_delta(deltas, packidx, pack,
932 delta_offset, tslen, delta_type, delta_size, recursion - 1);
935 return got_error(GOT_ERR_OBJ_TYPE);
941 static const struct got_error *
942 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
943 struct got_pack *pack, struct got_object_id *id, off_t offset,
944 size_t tslen, int delta_type, size_t delta_size, int idx)
946 const struct got_error *err = NULL;
949 *obj = calloc(1, sizeof(**obj));
951 return got_error_from_errno("calloc");
955 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
956 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
957 (*obj)->pack_offset = offset + tslen;
959 STAILQ_INIT(&(*obj)->deltas.entries);
960 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
961 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
962 (*obj)->pack_idx = idx;
964 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
965 offset, tslen, delta_type, delta_size,
966 GOT_DELTA_CHAIN_RECURSION_MAX);
970 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
973 (*obj)->type = resolved_type;
976 got_object_close(*obj);
982 const struct got_error *
983 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
984 struct got_packidx *packidx, int idx, struct got_object_id *id)
986 const struct got_error *err = NULL;
994 offset = got_packidx_get_object_offset(packidx, idx);
995 if (offset == (uint64_t)-1)
996 return got_error(GOT_ERR_BAD_PACKIDX);
998 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1004 case GOT_OBJ_TYPE_COMMIT:
1005 case GOT_OBJ_TYPE_TREE:
1006 case GOT_OBJ_TYPE_BLOB:
1007 case GOT_OBJ_TYPE_TAG:
1008 err = open_plain_object(obj, id, type, offset + tslen,
1011 case GOT_OBJ_TYPE_OFFSET_DELTA:
1012 case GOT_OBJ_TYPE_REF_DELTA:
1013 err = open_delta_object(obj, packidx, pack, id, offset,
1014 tslen, type, size, idx);
1017 err = got_error(GOT_ERR_OBJ_TYPE);
1024 const struct got_error *
1025 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
1026 struct got_pack *pack)
1028 struct got_delta *delta;
1029 uint64_t base_size = 0, result_size = 0;
1032 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1033 /* Plain object types are the delta base. */
1034 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1035 delta->type != GOT_OBJ_TYPE_TREE &&
1036 delta->type != GOT_OBJ_TYPE_BLOB &&
1037 delta->type != GOT_OBJ_TYPE_TAG) {
1038 const struct got_error *err;
1043 got_delta_cache_get(&delta_buf, &delta_len,
1044 pack->delta_cache, delta->data_offset);
1045 if (delta_buf == NULL) {
1047 err = read_delta_data(&delta_buf, &delta_len,
1048 delta->data_offset, pack);
1051 err = got_delta_cache_add(pack->delta_cache,
1052 delta->data_offset, delta_buf, delta_len);
1055 else if (err->code != GOT_ERR_NO_SPACE) {
1060 err = got_delta_get_sizes(&base_size, &result_size,
1061 delta_buf, delta_len);
1067 base_size = delta->size;
1068 if (base_size > *max_size)
1069 *max_size = base_size;
1070 if (result_size > *max_size)
1071 *max_size = result_size;
1077 const struct got_error *
1078 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1079 struct got_pack *pack)
1081 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1082 return got_error(GOT_ERR_OBJ_TYPE);
1084 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1087 const struct got_error *
1088 got_pack_dump_delta_chain_to_file(size_t *result_size,
1089 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1090 FILE *base_file, FILE *accum_file)
1092 const struct got_error *err = NULL;
1093 struct got_delta *delta;
1094 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1095 size_t base_bufsz = 0, accum_size = 0, delta_len;
1101 if (STAILQ_EMPTY(&deltas->entries))
1102 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1104 /* We process small enough files entirely in memory for speed. */
1105 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1108 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1109 accum_buf = malloc(max_size);
1110 if (accum_buf == NULL)
1111 return got_error_from_errno("malloc");
1116 /* Deltas are ordered in ascending order. */
1117 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1121 off_t delta_data_offset;
1123 /* Plain object types are the delta base. */
1124 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1125 delta->type != GOT_OBJ_TYPE_TREE &&
1126 delta->type != GOT_OBJ_TYPE_BLOB &&
1127 delta->type != GOT_OBJ_TYPE_TAG) {
1128 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1132 delta_data_offset = delta->offset + delta->tslen;
1133 if (delta_data_offset >= pack->filesize) {
1134 err = got_error(GOT_ERR_PACK_OFFSET);
1137 if (pack->map == NULL) {
1138 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1140 err = got_error_from_errno("lseek");
1146 mapoff = (size_t)delta_data_offset;
1147 err = got_inflate_to_file_mmap(
1148 &base_bufsz, NULL, NULL, pack->map,
1149 mapoff, pack->filesize - mapoff,
1152 err = got_inflate_to_file_fd(
1153 &base_bufsz, NULL, NULL, pack->fd,
1157 mapoff = (size_t)delta_data_offset;
1158 err = got_inflate_to_mem_mmap(&base_buf,
1159 &base_bufsz, NULL, NULL,
1161 pack->filesize - mapoff);
1163 err = got_inflate_to_mem_fd(&base_buf,
1164 &base_bufsz, NULL, NULL, max_size,
1175 got_delta_cache_get(&delta_buf, &delta_len,
1176 pack->delta_cache, delta->data_offset);
1177 if (delta_buf == NULL) {
1179 err = read_delta_data(&delta_buf, &delta_len,
1180 delta->data_offset, pack);
1183 err = got_delta_cache_add(pack->delta_cache,
1184 delta->data_offset, delta_buf, delta_len);
1187 else if (err->code != GOT_ERR_NO_SPACE) {
1193 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1194 delta_buf, delta_len, accum_buf,
1195 &accum_size, max_size);
1198 err = got_delta_apply(base_file, delta_buf,
1200 /* Final delta application writes to output file. */
1201 ++n < deltas->nentries ? accum_file : outfile,
1209 if (n < deltas->nentries) {
1210 /* Accumulated delta becomes the new base. */
1212 uint8_t *tmp = accum_buf;
1214 * Base buffer switches roles with accumulation
1215 * buffer. Ensure it can hold the largest
1216 * result in the delta chain. The initial
1217 * allocation might have been smaller.
1219 if (base_bufsz < max_size) {
1221 p = reallocarray(base_buf, 1, max_size);
1223 err = got_error_from_errno(
1228 base_bufsz = max_size;
1230 accum_buf = base_buf;
1233 FILE *tmp = accum_file;
1234 accum_file = base_file;
1245 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1247 if (len != accum_size)
1248 err = got_ferror(outfile, GOT_ERR_IO);
1252 *result_size = accum_size;
1256 const struct got_error *
1257 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1258 struct got_delta_chain *deltas, struct got_pack *pack)
1260 const struct got_error *err = NULL;
1261 struct got_delta *delta;
1262 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1263 size_t base_bufsz = 0, accum_size = 0, delta_len;
1270 if (STAILQ_EMPTY(&deltas->entries))
1271 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1273 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1276 accum_buf = malloc(max_size);
1277 if (accum_buf == NULL)
1278 return got_error_from_errno("malloc");
1280 /* Deltas are ordered in ascending order. */
1281 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1284 size_t delta_data_offset;
1286 /* Plain object types are the delta base. */
1287 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1288 delta->type != GOT_OBJ_TYPE_TREE &&
1289 delta->type != GOT_OBJ_TYPE_BLOB &&
1290 delta->type != GOT_OBJ_TYPE_TAG) {
1291 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1295 delta_data_offset = delta->offset + delta->tslen;
1296 if (delta_data_offset >= pack->filesize) {
1297 err = got_error(GOT_ERR_PACK_OFFSET);
1301 size_t mapoff = (size_t)delta_data_offset;
1302 err = got_inflate_to_mem_mmap(&base_buf,
1303 &base_bufsz, NULL, NULL, pack->map,
1304 mapoff, pack->filesize - mapoff);
1306 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1308 err = got_error_from_errno("lseek");
1311 err = got_inflate_to_mem_fd(&base_buf,
1312 &base_bufsz, NULL, NULL, max_size,
1321 got_delta_cache_get(&delta_buf, &delta_len,
1322 pack->delta_cache, delta->data_offset);
1323 if (delta_buf == NULL) {
1325 err = read_delta_data(&delta_buf, &delta_len,
1326 delta->data_offset, pack);
1329 err = got_delta_cache_add(pack->delta_cache,
1330 delta->data_offset, delta_buf, delta_len);
1333 else if (err->code != GOT_ERR_NO_SPACE) {
1338 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1339 delta_buf, delta_len, accum_buf,
1340 &accum_size, max_size);
1347 if (n < deltas->nentries) {
1348 /* Accumulated delta becomes the new base. */
1349 uint8_t *tmp = accum_buf;
1351 * Base buffer switches roles with accumulation buffer.
1352 * Ensure it can hold the largest result in the delta
1353 * chain. Initial allocation might have been smaller.
1355 if (base_bufsz < max_size) {
1357 p = reallocarray(base_buf, 1, max_size);
1359 err = got_error_from_errno(
1364 base_bufsz = max_size;
1366 accum_buf = base_buf;
1378 *outbuf = accum_buf;
1379 *outlen = accum_size;
1384 const struct got_error *
1385 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1386 FILE *outfile, FILE *base_file, FILE *accum_file)
1388 const struct got_error *err = NULL;
1390 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1391 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1393 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1394 if (obj->pack_offset >= pack->filesize)
1395 return got_error(GOT_ERR_PACK_OFFSET);
1398 size_t mapoff = (size_t)obj->pack_offset;
1399 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1400 pack->map, mapoff, pack->filesize - mapoff,
1403 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1404 return got_error_from_errno("lseek");
1405 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1409 err = got_pack_dump_delta_chain_to_file(&obj->size,
1410 &obj->deltas, pack, outfile, base_file, accum_file);
1415 const struct got_error *
1416 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1417 struct got_object *obj, struct got_pack *pack)
1419 const struct got_error *err = NULL;
1421 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1422 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1424 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1425 if (obj->pack_offset >= pack->filesize)
1426 return got_error(GOT_ERR_PACK_OFFSET);
1428 size_t mapoff = (size_t)obj->pack_offset;
1429 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1430 pack->map, mapoff, pack->filesize - mapoff);
1432 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1433 return got_error_from_errno("lseek");
1434 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1435 obj->size, pack->fd);
1438 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,