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>
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_opentemp.h"
37 #include "got_lib_sha1.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_delta_cache.h"
40 #include "got_lib_inflate.h"
41 #include "got_lib_object.h"
42 #include "got_lib_object_parse.h"
43 #include "got_lib_privsep.h"
44 #include "got_lib_pack.h"
47 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
51 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
54 static const struct got_error *
55 verify_fanout_table(uint32_t *fanout_table)
59 for (i = 0; i < 0xff - 1; i++) {
60 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
61 return got_error(GOT_ERR_BAD_PACKIDX);
67 const struct got_error *
68 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
70 const struct got_error *err = NULL;
71 struct got_packidx_v2_hdr *h;
73 uint8_t sha1[SHA1_DIGEST_LENGTH];
74 size_t nobj, len_fanout, len_ids, offset, remain;
84 if (remain < sizeof(*h->magic)) {
85 err = got_error(GOT_ERR_BAD_PACKIDX);
89 h->magic = (uint32_t *)(p->map + offset);
91 h->magic = malloc(sizeof(*h->magic));
92 if (h->magic == NULL) {
93 err = got_error_from_errno("malloc");
96 n = read(p->fd, h->magic, sizeof(*h->magic));
98 err = got_error_from_errno("read");
100 } else if (n != sizeof(*h->magic)) {
101 err = got_error(GOT_ERR_BAD_PACKIDX);
105 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
109 offset += sizeof(*h->magic);
110 remain -= sizeof(*h->magic);
113 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
115 if (remain < sizeof(*h->version)) {
116 err = got_error(GOT_ERR_BAD_PACKIDX);
120 h->version = (uint32_t *)(p->map + offset);
122 h->version = malloc(sizeof(*h->version));
123 if (h->version == NULL) {
124 err = got_error_from_errno("malloc");
127 n = read(p->fd, h->version, sizeof(*h->version));
129 err = got_error_from_errno("read");
131 } else if (n != sizeof(*h->version)) {
132 err = got_error(GOT_ERR_BAD_PACKIDX);
136 if (*h->version != htobe32(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");
164 } else if (n != len_fanout) {
165 err = got_error(GOT_ERR_BAD_PACKIDX);
169 err = verify_fanout_table(h->fanout_table);
173 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
174 offset += len_fanout;
175 remain -= len_fanout;
177 nobj = be32toh(h->fanout_table[0xff]);
178 len_ids = nobj * sizeof(*h->sorted_ids);
179 if (len_ids <= nobj || len_ids > remain) {
180 err = got_error(GOT_ERR_BAD_PACKIDX);
185 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
187 h->sorted_ids = malloc(len_ids);
188 if (h->sorted_ids == NULL) {
189 err = got_error(GOT_ERR_BAD_PACKIDX);
192 n = read(p->fd, h->sorted_ids, len_ids);
194 err = got_error_from_errno("read");
195 else if (n != len_ids) {
196 err = got_error(GOT_ERR_BAD_PACKIDX);
201 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
205 if (remain < nobj * sizeof(*h->crc32)) {
206 err = got_error(GOT_ERR_BAD_PACKIDX);
210 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
212 h->crc32 = malloc(nobj * sizeof(*h->crc32));
213 if (h->crc32 == NULL) {
214 err = got_error_from_errno("malloc");
217 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
219 err = got_error_from_errno("read");
220 else if (n != nobj * sizeof(*h->crc32)) {
221 err = got_error(GOT_ERR_BAD_PACKIDX);
226 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
227 remain -= nobj * sizeof(*h->crc32);
228 offset += nobj * sizeof(*h->crc32);
230 if (remain < nobj * sizeof(*h->offsets)) {
231 err = got_error(GOT_ERR_BAD_PACKIDX);
235 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
237 h->offsets = malloc(nobj * sizeof(*h->offsets));
238 if (h->offsets == NULL) {
239 err = got_error_from_errno("malloc");
242 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
244 err = got_error_from_errno("read");
245 else if (n != nobj * sizeof(*h->offsets)) {
246 err = got_error(GOT_ERR_BAD_PACKIDX);
251 SHA1Update(&ctx, (uint8_t *)h->offsets,
252 nobj * sizeof(*h->offsets));
253 remain -= nobj * sizeof(*h->offsets);
254 offset += nobj * sizeof(*h->offsets);
256 /* Large file offsets are contained only in files > 2GB. */
257 if (verify || packfile_size > 0x7fffffff) {
258 for (i = 0; i < nobj; i++) {
259 uint32_t o = h->offsets[i];
260 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
264 if (p->nlargeobj == 0)
266 else if (packfile_size <= 0x7fffffff) {
267 err = got_error(GOT_ERR_BAD_PACKIDX);
271 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
272 err = got_error(GOT_ERR_BAD_PACKIDX);
276 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
278 h->large_offsets = malloc(p->nlargeobj *
279 sizeof(*h->large_offsets));
280 if (h->large_offsets == NULL) {
281 err = got_error_from_errno("malloc");
284 n = read(p->fd, h->large_offsets,
285 p->nlargeobj * sizeof(*h->large_offsets));
287 err = got_error_from_errno("read");
288 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
289 err = got_error(GOT_ERR_BAD_PACKIDX);
294 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
295 p->nlargeobj * sizeof(*h->large_offsets));
296 remain -= p->nlargeobj * sizeof(*h->large_offsets);
297 offset += p->nlargeobj * sizeof(*h->large_offsets);
300 if (remain < sizeof(*h->trailer)) {
301 err = got_error(GOT_ERR_BAD_PACKIDX);
306 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
308 h->trailer = malloc(sizeof(*h->trailer));
309 if (h->trailer == NULL) {
310 err = got_error_from_errno("malloc");
313 n = read(p->fd, h->trailer, sizeof(*h->trailer));
315 err = got_error_from_errno("read");
316 else if (n != sizeof(*h->trailer)) {
317 err = got_error(GOT_ERR_BAD_PACKIDX);
322 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
323 SHA1Final(sha1, &ctx);
324 if (memcmp(h->trailer->packidx_sha1, sha1,
325 SHA1_DIGEST_LENGTH) != 0)
326 err = got_error(GOT_ERR_PACKIDX_CSUM);
332 const struct got_error *
333 got_packidx_open(struct got_packidx **packidx,
334 int dir_fd, const char *relpath, int verify)
336 const struct got_error *err = NULL;
337 struct got_packidx *p = NULL;
339 struct stat idx_sb, pack_sb;
343 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
348 * Ensure that a corresponding pack file exists.
349 * Some Git repositories have this problem. Git seems to ignore
350 * the existence of lonely pack index files but we do not.
352 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
353 if (errno == ENOENT) {
354 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
357 err = got_error_from_errno2("fstatat", pack_relpath);
361 p = calloc(1, sizeof(*p));
363 err = got_error_from_errno("calloc");
367 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW);
369 err = got_error_from_errno2("openat", relpath);
374 if (fstat(p->fd, &idx_sb) != 0) {
375 err = got_error_from_errno2("fstat", relpath);
380 p->len = idx_sb.st_size;
381 if (p->len < sizeof(p->hdr)) {
382 err = got_error(GOT_ERR_BAD_PACKIDX);
388 p->path_packidx = strdup(relpath);
389 if (p->path_packidx == NULL) {
390 err = got_error_from_errno("strdup");
394 #ifndef GOT_PACK_NO_MMAP
395 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
396 if (p->map == MAP_FAILED) {
397 if (errno != ENOMEM) {
398 err = got_error_from_errno("mmap");
401 p->map = NULL; /* fall back to read(2) */
405 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
409 got_packidx_close(p);
416 const struct got_error *
417 got_packidx_close(struct got_packidx *packidx)
419 const struct got_error *err = NULL;
421 free(packidx->path_packidx);
423 if (munmap(packidx->map, packidx->len) == -1)
424 err = got_error_from_errno("munmap");
426 free(packidx->hdr.magic);
427 free(packidx->hdr.version);
428 free(packidx->hdr.fanout_table);
429 free(packidx->hdr.sorted_ids);
430 free(packidx->hdr.crc32);
431 free(packidx->hdr.offsets);
432 free(packidx->hdr.large_offsets);
433 free(packidx->hdr.trailer);
435 if (close(packidx->fd) == -1 && err == NULL)
436 err = got_error_from_errno("close");
442 const struct got_error *
443 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
447 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
448 size = strlen(path_packidx) + 2;
449 if (size < GOT_PACKFILE_NAMELEN + 1)
450 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
452 *path_packfile = malloc(size);
453 if (*path_packfile == NULL)
454 return got_error_from_errno("malloc");
456 /* Copy up to and excluding ".idx". */
457 if (strlcpy(*path_packfile, path_packidx,
458 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
459 return got_error(GOT_ERR_NO_SPACE);
461 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
462 return got_error(GOT_ERR_NO_SPACE);
468 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
470 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
471 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
473 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
474 if (idx < 0 || idx >= packidx->nlargeobj ||
475 packidx->hdr.large_offsets == NULL)
477 loffset = be64toh(packidx->hdr.large_offsets[idx]);
478 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
480 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
484 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
486 u_int8_t id0 = id->sha1[0];
487 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
488 int left = 0, right = totobj - 1;
491 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
493 while (left <= right) {
494 struct got_packidx_object_id *oid;
497 i = ((left + right) / 2);
498 oid = &packidx->hdr.sorted_ids[i];
499 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
511 const struct got_error *
512 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
513 struct got_packidx *packidx, const char *id_str_prefix)
515 const struct got_error *err = NULL;
517 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
519 size_t prefix_len = strlen(id_str_prefix);
520 struct got_packidx_object_id *oid;
523 STAILQ_INIT(matched_ids);
526 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
528 hex[0] = id_str_prefix[0];
529 hex[1] = id_str_prefix[1];
531 if (!got_parse_xdigit(&id0, hex))
532 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
534 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
535 oid = &packidx->hdr.sorted_ids[i];
536 while (i < totobj && oid->sha1[0] == id0) {
537 char id_str[SHA1_DIGEST_STRING_LENGTH];
538 struct got_object_qid *qid;
541 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
542 return got_error(GOT_ERR_NO_SPACE);
544 cmp = strncmp(id_str, id_str_prefix, prefix_len);
546 oid = &packidx->hdr.sorted_ids[++i];
551 err = got_object_qid_alloc_partial(&qid);
554 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
555 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
557 oid = &packidx->hdr.sorted_ids[++i];
561 got_object_id_queue_free(matched_ids);
565 static const struct got_error *
566 pack_stop_privsep_child(struct got_pack *pack)
568 const struct got_error *err = NULL;
570 if (pack->privsep_child == NULL)
573 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
576 err = got_privsep_wait_for_child(pack->privsep_child->pid);
577 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
578 err = got_error_from_errno("close");
579 imsg_clear(pack->privsep_child->ibuf);
580 free(pack->privsep_child->ibuf);
581 free(pack->privsep_child);
582 pack->privsep_child = NULL;
586 const struct got_error *
587 got_pack_close(struct got_pack *pack)
589 const struct got_error *err = NULL;
591 err = pack_stop_privsep_child(pack);
592 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
593 err = got_error_from_errno("munmap");
594 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
595 err = got_error_from_errno("close");
597 free(pack->path_packfile);
598 pack->path_packfile = NULL;
600 if (pack->delta_cache) {
601 got_delta_cache_free(pack->delta_cache);
602 pack->delta_cache = NULL;
608 const struct got_error *
609 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
610 struct got_pack *pack, off_t offset)
620 if (offset >= pack->filesize)
621 return got_error(GOT_ERR_PACK_OFFSET);
624 mapoff = (size_t)offset;
626 if (lseek(pack->fd, offset, SEEK_SET) == -1)
627 return got_error_from_errno("lseek");
631 /* We do not support size values which don't fit in 64 bit. */
633 return got_error(GOT_ERR_NO_SPACE);
636 sizeN = *(pack->map + mapoff);
637 mapoff += sizeof(sizeN);
639 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
641 return got_error_from_errno("read");
642 if (n != sizeof(sizeN))
643 return got_error(GOT_ERR_BAD_PACKFILE);
645 *len += sizeof(sizeN);
648 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
649 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
650 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
652 size_t shift = 4 + 7 * (i - 1);
653 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
656 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
663 static const struct got_error *
664 open_plain_object(struct got_object **obj, struct got_object_id *id,
665 uint8_t type, off_t offset, size_t size, int idx)
667 *obj = calloc(1, sizeof(**obj));
669 return got_error_from_errno("calloc");
672 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
673 (*obj)->pack_idx = idx;
676 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
677 (*obj)->pack_offset = offset;
682 static const struct got_error *
683 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
694 /* We do not support offset values which don't fit in 64 bit. */
696 return got_error(GOT_ERR_NO_SPACE);
700 if (delta_offset >= pack->filesize)
701 return got_error(GOT_ERR_PACK_OFFSET);
702 mapoff = (size_t)delta_offset + *len;
703 offN = *(pack->map + mapoff);
706 n = read(pack->fd, &offN, sizeof(offN));
708 return got_error_from_errno("read");
709 if (n != sizeof(offN))
710 return got_error(GOT_ERR_BAD_PACKFILE);
712 *len += sizeof(offN);
715 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
719 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
722 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
728 const struct got_error *
729 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
730 off_t offset, int tslen)
732 const struct got_error *err;
738 err = parse_negative_offset(&negoffset, &negofflen, pack,
743 /* Compute the base object's offset (must be in the same pack file). */
744 *base_offset = (offset - negoffset);
745 if (*base_offset <= 0)
746 return got_error(GOT_ERR_BAD_PACKFILE);
752 static const struct got_error *
753 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
754 size_t delta_data_offset, struct got_pack *pack)
756 const struct got_error *err = NULL;
759 if (delta_data_offset >= pack->filesize)
760 return got_error(GOT_ERR_PACK_OFFSET);
761 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
762 NULL, NULL, pack->map, delta_data_offset,
763 pack->filesize - delta_data_offset);
765 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
766 return got_error_from_errno("lseek");
767 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
773 static const struct got_error *
774 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
775 int delta_type, size_t delta_size, size_t delta_data_offset)
777 struct got_delta *delta;
779 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
782 return got_error_from_errno("got_delta_open");
783 /* delta is freed in got_object_close() */
785 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
789 static const struct got_error *
790 resolve_offset_delta(struct got_delta_chain *deltas,
791 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
792 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
795 const struct got_error *err;
800 off_t delta_data_offset;
803 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
804 delta_offset, tslen);
808 delta_data_offset = delta_offset + tslen + consumed;
809 if (delta_data_offset >= pack->filesize)
810 return got_error(GOT_ERR_PACK_OFFSET);
812 if (pack->map == NULL) {
813 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
814 if (delta_data_offset == -1)
815 return got_error_from_errno("lseek");
818 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
823 /* An offset delta must be in the same packfile. */
824 if (base_offset >= pack->filesize)
825 return got_error(GOT_ERR_PACK_OFFSET);
827 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
828 &base_tslen, pack, base_offset);
832 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
833 base_tslen, base_type, base_size, recursion - 1);
836 const struct got_error *
837 got_pack_parse_ref_delta(struct got_object_id *id,
838 struct got_pack *pack, off_t delta_offset, int tslen)
841 size_t mapoff = delta_offset + tslen;
842 memcpy(id, pack->map + mapoff, sizeof(*id));
845 n = read(pack->fd, id, sizeof(*id));
847 return got_error_from_errno("read");
848 if (n != sizeof(*id))
849 return got_error(GOT_ERR_BAD_PACKFILE);
855 static const struct got_error *
856 resolve_ref_delta(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;
861 struct got_object_id id;
867 off_t delta_data_offset;
869 if (delta_offset + tslen >= pack->filesize)
870 return got_error(GOT_ERR_PACK_OFFSET);
872 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
876 delta_data_offset = delta_offset + tslen + sizeof(id);
878 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
879 if (delta_data_offset == -1)
880 return got_error_from_errno("lseek");
883 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
888 /* Delta base must be in the same pack file. */
889 idx = got_packidx_get_object_idx(packidx, &id);
891 return got_error(GOT_ERR_NO_OBJ);
893 base_offset = got_packidx_get_object_offset(packidx, idx);
894 if (base_offset == (uint64_t)-1)
895 return got_error(GOT_ERR_BAD_PACKIDX);
897 if (base_offset >= pack->filesize)
898 return got_error(GOT_ERR_PACK_OFFSET);
900 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
901 &base_tslen, pack, base_offset);
905 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
906 base_tslen, base_type, base_size, recursion - 1);
909 const struct got_error *
910 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
911 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
912 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
914 const struct got_error *err = NULL;
916 if (--recursion == 0)
917 return got_error(GOT_ERR_RECURSION);
919 switch (delta_type) {
920 case GOT_OBJ_TYPE_COMMIT:
921 case GOT_OBJ_TYPE_TREE:
922 case GOT_OBJ_TYPE_BLOB:
923 case GOT_OBJ_TYPE_TAG:
924 /* Plain types are the final delta base. Recursion ends. */
925 err = add_delta(deltas, delta_offset, tslen, delta_type,
928 case GOT_OBJ_TYPE_OFFSET_DELTA:
929 err = resolve_offset_delta(deltas, packidx, pack,
930 delta_offset, tslen, delta_type, delta_size, recursion - 1);
932 case GOT_OBJ_TYPE_REF_DELTA:
933 err = resolve_ref_delta(deltas, packidx, pack,
934 delta_offset, tslen, delta_type, delta_size, recursion - 1);
937 return got_error(GOT_ERR_OBJ_TYPE);
943 static const struct got_error *
944 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
945 struct got_pack *pack, struct got_object_id *id, off_t offset,
946 size_t tslen, int delta_type, size_t delta_size, int idx)
948 const struct got_error *err = NULL;
951 *obj = calloc(1, sizeof(**obj));
953 return got_error_from_errno("calloc");
957 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
958 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
959 (*obj)->pack_offset = offset + tslen;
961 STAILQ_INIT(&(*obj)->deltas.entries);
962 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
963 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
964 (*obj)->pack_idx = idx;
966 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
967 offset, tslen, delta_type, delta_size,
968 GOT_DELTA_CHAIN_RECURSION_MAX);
972 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
975 (*obj)->type = resolved_type;
978 got_object_close(*obj);
984 const struct got_error *
985 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
986 struct got_packidx *packidx, int idx, struct got_object_id *id)
988 const struct got_error *err = NULL;
996 offset = got_packidx_get_object_offset(packidx, idx);
997 if (offset == (uint64_t)-1)
998 return got_error(GOT_ERR_BAD_PACKIDX);
1000 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1006 case GOT_OBJ_TYPE_COMMIT:
1007 case GOT_OBJ_TYPE_TREE:
1008 case GOT_OBJ_TYPE_BLOB:
1009 case GOT_OBJ_TYPE_TAG:
1010 err = open_plain_object(obj, id, type, offset + tslen,
1013 case GOT_OBJ_TYPE_OFFSET_DELTA:
1014 case GOT_OBJ_TYPE_REF_DELTA:
1015 err = open_delta_object(obj, packidx, pack, id, offset,
1016 tslen, type, size, idx);
1019 err = got_error(GOT_ERR_OBJ_TYPE);
1026 const struct got_error *
1027 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
1028 struct got_pack *pack)
1030 struct got_delta *delta;
1031 uint64_t base_size = 0, result_size = 0;
1034 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1035 /* Plain object types are the delta base. */
1036 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1037 delta->type != GOT_OBJ_TYPE_TREE &&
1038 delta->type != GOT_OBJ_TYPE_BLOB &&
1039 delta->type != GOT_OBJ_TYPE_TAG) {
1040 const struct got_error *err;
1045 got_delta_cache_get(&delta_buf, &delta_len,
1046 pack->delta_cache, delta->data_offset);
1047 if (delta_buf == NULL) {
1049 err = read_delta_data(&delta_buf, &delta_len,
1050 delta->data_offset, pack);
1053 err = got_delta_cache_add(pack->delta_cache,
1054 delta->data_offset, delta_buf, delta_len);
1057 else if (err->code != GOT_ERR_NO_SPACE) {
1062 err = got_delta_get_sizes(&base_size, &result_size,
1063 delta_buf, delta_len);
1069 base_size = delta->size;
1070 if (base_size > *max_size)
1071 *max_size = base_size;
1072 if (result_size > *max_size)
1073 *max_size = result_size;
1079 const struct got_error *
1080 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1081 struct got_pack *pack)
1083 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1084 return got_error(GOT_ERR_OBJ_TYPE);
1086 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1089 const struct got_error *
1090 got_pack_dump_delta_chain_to_file(size_t *result_size,
1091 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1092 FILE *base_file, FILE *accum_file)
1094 const struct got_error *err = NULL;
1095 struct got_delta *delta;
1096 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1097 size_t base_bufsz = 0, accum_size = 0, delta_len;
1103 if (STAILQ_EMPTY(&deltas->entries))
1104 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1106 /* We process small enough files entirely in memory for speed. */
1107 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1110 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1111 accum_buf = malloc(max_size);
1112 if (accum_buf == NULL)
1113 return got_error_from_errno("malloc");
1118 /* Deltas are ordered in ascending order. */
1119 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1123 off_t delta_data_offset;
1125 /* Plain object types are the delta base. */
1126 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1127 delta->type != GOT_OBJ_TYPE_TREE &&
1128 delta->type != GOT_OBJ_TYPE_BLOB &&
1129 delta->type != GOT_OBJ_TYPE_TAG) {
1130 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1134 delta_data_offset = delta->offset + delta->tslen;
1135 if (delta_data_offset >= pack->filesize) {
1136 err = got_error(GOT_ERR_PACK_OFFSET);
1139 if (pack->map == NULL) {
1140 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1142 err = got_error_from_errno("lseek");
1148 mapoff = (size_t)delta_data_offset;
1149 err = got_inflate_to_file_mmap(
1150 &base_bufsz, NULL, NULL, pack->map,
1151 mapoff, pack->filesize - mapoff,
1154 err = got_inflate_to_file_fd(
1155 &base_bufsz, NULL, NULL, pack->fd,
1159 mapoff = (size_t)delta_data_offset;
1160 err = got_inflate_to_mem_mmap(&base_buf,
1161 &base_bufsz, NULL, NULL,
1163 pack->filesize - mapoff);
1165 err = got_inflate_to_mem_fd(&base_buf,
1166 &base_bufsz, NULL, NULL, max_size,
1177 got_delta_cache_get(&delta_buf, &delta_len,
1178 pack->delta_cache, delta->data_offset);
1179 if (delta_buf == NULL) {
1181 err = read_delta_data(&delta_buf, &delta_len,
1182 delta->data_offset, pack);
1185 err = got_delta_cache_add(pack->delta_cache,
1186 delta->data_offset, delta_buf, delta_len);
1189 else if (err->code != GOT_ERR_NO_SPACE) {
1195 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1196 delta_buf, delta_len, accum_buf,
1197 &accum_size, max_size);
1200 err = got_delta_apply(base_file, delta_buf,
1202 /* Final delta application writes to output file. */
1203 ++n < deltas->nentries ? accum_file : outfile,
1211 if (n < deltas->nentries) {
1212 /* Accumulated delta becomes the new base. */
1214 uint8_t *tmp = accum_buf;
1216 * Base buffer switches roles with accumulation
1217 * buffer. Ensure it can hold the largest
1218 * result in the delta chain. The initial
1219 * allocation might have been smaller.
1221 if (base_bufsz < max_size) {
1223 p = reallocarray(base_buf, 1, max_size);
1225 err = got_error_from_errno(
1230 base_bufsz = max_size;
1232 accum_buf = base_buf;
1235 FILE *tmp = accum_file;
1236 accum_file = base_file;
1247 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1249 if (len != accum_size)
1250 err = got_ferror(outfile, GOT_ERR_IO);
1254 *result_size = accum_size;
1258 const struct got_error *
1259 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1260 struct got_delta_chain *deltas, struct got_pack *pack)
1262 const struct got_error *err = NULL;
1263 struct got_delta *delta;
1264 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1265 size_t base_bufsz = 0, accum_size = 0, delta_len;
1272 if (STAILQ_EMPTY(&deltas->entries))
1273 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1275 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1278 accum_buf = malloc(max_size);
1279 if (accum_buf == NULL)
1280 return got_error_from_errno("malloc");
1282 /* Deltas are ordered in ascending order. */
1283 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1286 size_t delta_data_offset;
1288 /* Plain object types are the delta base. */
1289 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1290 delta->type != GOT_OBJ_TYPE_TREE &&
1291 delta->type != GOT_OBJ_TYPE_BLOB &&
1292 delta->type != GOT_OBJ_TYPE_TAG) {
1293 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1297 delta_data_offset = delta->offset + delta->tslen;
1298 if (delta_data_offset >= pack->filesize) {
1299 err = got_error(GOT_ERR_PACK_OFFSET);
1303 size_t mapoff = (size_t)delta_data_offset;
1304 err = got_inflate_to_mem_mmap(&base_buf,
1305 &base_bufsz, NULL, NULL, pack->map,
1306 mapoff, pack->filesize - mapoff);
1308 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1310 err = got_error_from_errno("lseek");
1313 err = got_inflate_to_mem_fd(&base_buf,
1314 &base_bufsz, NULL, NULL, max_size,
1323 got_delta_cache_get(&delta_buf, &delta_len,
1324 pack->delta_cache, delta->data_offset);
1325 if (delta_buf == NULL) {
1327 err = read_delta_data(&delta_buf, &delta_len,
1328 delta->data_offset, pack);
1331 err = got_delta_cache_add(pack->delta_cache,
1332 delta->data_offset, delta_buf, delta_len);
1335 else if (err->code != GOT_ERR_NO_SPACE) {
1340 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1341 delta_buf, delta_len, accum_buf,
1342 &accum_size, max_size);
1349 if (n < deltas->nentries) {
1350 /* Accumulated delta becomes the new base. */
1351 uint8_t *tmp = accum_buf;
1353 * Base buffer switches roles with accumulation buffer.
1354 * Ensure it can hold the largest result in the delta
1355 * chain. Initial allocation might have been smaller.
1357 if (base_bufsz < max_size) {
1359 p = reallocarray(base_buf, 1, max_size);
1361 err = got_error_from_errno(
1366 base_bufsz = max_size;
1368 accum_buf = base_buf;
1380 *outbuf = accum_buf;
1381 *outlen = accum_size;
1386 const struct got_error *
1387 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1388 FILE *outfile, FILE *base_file, FILE *accum_file)
1390 const struct got_error *err = NULL;
1392 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1393 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1395 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1396 if (obj->pack_offset >= pack->filesize)
1397 return got_error(GOT_ERR_PACK_OFFSET);
1400 size_t mapoff = (size_t)obj->pack_offset;
1401 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1402 pack->map, mapoff, pack->filesize - mapoff,
1405 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1406 return got_error_from_errno("lseek");
1407 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1411 err = got_pack_dump_delta_chain_to_file(&obj->size,
1412 &obj->deltas, pack, outfile, base_file, accum_file);
1417 const struct got_error *
1418 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1419 struct got_object *obj, struct got_pack *pack)
1421 const struct got_error *err = NULL;
1423 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1424 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1426 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1427 if (obj->pack_offset >= pack->filesize)
1428 return got_error(GOT_ERR_PACK_OFFSET);
1430 size_t mapoff = (size_t)obj->pack_offset;
1431 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1432 pack->map, mapoff, pack->filesize - mapoff);
1434 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1435 return got_error_from_errno("lseek");
1436 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1437 obj->size, pack->fd);
1440 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,