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>
34 #include "got_error.h"
35 #include "got_object.h"
36 #include "got_opentemp.h"
39 #include "got_lib_sha1.h"
40 #include "got_lib_delta.h"
41 #include "got_lib_delta_cache.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, off_t packfile_size)
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;
86 if (remain < sizeof(*h->magic)) {
87 err = got_error(GOT_ERR_BAD_PACKIDX);
91 h->magic = (uint32_t *)(p->map + offset);
93 h->magic = malloc(sizeof(*h->magic));
94 if (h->magic == NULL) {
95 err = got_error_from_errno("malloc");
98 n = read(p->fd, h->magic, sizeof(*h->magic));
100 err = got_error_from_errno("read");
102 } else if (n != sizeof(*h->magic)) {
103 err = got_error(GOT_ERR_BAD_PACKIDX);
107 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
108 err = got_error(GOT_ERR_BAD_PACKIDX);
111 offset += sizeof(*h->magic);
112 remain -= sizeof(*h->magic);
115 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
117 if (remain < sizeof(*h->version)) {
118 err = got_error(GOT_ERR_BAD_PACKIDX);
122 h->version = (uint32_t *)(p->map + offset);
124 h->version = malloc(sizeof(*h->version));
125 if (h->version == NULL) {
126 err = got_error_from_errno("malloc");
129 n = read(p->fd, h->version, sizeof(*h->version));
131 err = got_error_from_errno("read");
133 } else if (n != sizeof(*h->version)) {
134 err = got_error(GOT_ERR_BAD_PACKIDX);
138 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
139 err = got_error(GOT_ERR_BAD_PACKIDX);
142 offset += sizeof(*h->version);
143 remain -= sizeof(*h->version);
146 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
149 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
150 if (remain < len_fanout) {
151 err = got_error(GOT_ERR_BAD_PACKIDX);
155 h->fanout_table = (uint32_t *)(p->map + offset);
157 h->fanout_table = malloc(len_fanout);
158 if (h->fanout_table == NULL) {
159 err = got_error_from_errno("malloc");
162 n = read(p->fd, h->fanout_table, len_fanout);
164 err = got_error_from_errno("read");
166 } else if (n != len_fanout) {
167 err = got_error(GOT_ERR_BAD_PACKIDX);
171 err = verify_fanout_table(h->fanout_table);
175 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
176 offset += len_fanout;
177 remain -= len_fanout;
179 nobj = be32toh(h->fanout_table[0xff]);
180 len_ids = nobj * sizeof(*h->sorted_ids);
181 if (len_ids <= nobj || len_ids > remain) {
182 err = got_error(GOT_ERR_BAD_PACKIDX);
187 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
189 h->sorted_ids = malloc(len_ids);
190 if (h->sorted_ids == NULL) {
191 err = got_error(GOT_ERR_BAD_PACKIDX);
194 n = read(p->fd, h->sorted_ids, len_ids);
196 err = got_error_from_errno("read");
197 else if (n != len_ids) {
198 err = got_error(GOT_ERR_BAD_PACKIDX);
203 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
207 if (remain < nobj * sizeof(*h->crc32)) {
208 err = got_error(GOT_ERR_BAD_PACKIDX);
212 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
214 h->crc32 = malloc(nobj * sizeof(*h->crc32));
215 if (h->crc32 == NULL) {
216 err = got_error_from_errno("malloc");
219 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
221 err = got_error_from_errno("read");
222 else if (n != nobj * sizeof(*h->crc32)) {
223 err = got_error(GOT_ERR_BAD_PACKIDX);
228 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
229 remain -= nobj * sizeof(*h->crc32);
230 offset += nobj * sizeof(*h->crc32);
232 if (remain < nobj * sizeof(*h->offsets)) {
233 err = got_error(GOT_ERR_BAD_PACKIDX);
237 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
239 h->offsets = malloc(nobj * sizeof(*h->offsets));
240 if (h->offsets == NULL) {
241 err = got_error_from_errno("malloc");
244 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
246 err = got_error_from_errno("read");
247 else if (n != nobj * sizeof(*h->offsets)) {
248 err = got_error(GOT_ERR_BAD_PACKIDX);
253 SHA1Update(&ctx, (uint8_t *)h->offsets,
254 nobj * sizeof(*h->offsets));
255 remain -= nobj * sizeof(*h->offsets);
256 offset += nobj * sizeof(*h->offsets);
258 /* Large file offsets are contained only in files > 2GB. */
259 if (verify || packfile_size > 0x7fffffff) {
260 for (i = 0; i < nobj; i++) {
261 uint32_t o = h->offsets[i];
262 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
266 if (p->nlargeobj == 0)
268 else if (packfile_size <= 0x7fffffff) {
269 err = got_error(GOT_ERR_BAD_PACKIDX);
273 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
274 err = got_error(GOT_ERR_BAD_PACKIDX);
278 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
280 h->large_offsets = malloc(p->nlargeobj *
281 sizeof(*h->large_offsets));
282 if (h->large_offsets == NULL) {
283 err = got_error_from_errno("malloc");
286 n = read(p->fd, h->large_offsets,
287 p->nlargeobj * sizeof(*h->large_offsets));
289 err = got_error_from_errno("read");
290 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
291 err = got_error(GOT_ERR_BAD_PACKIDX);
296 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
297 p->nlargeobj * sizeof(*h->large_offsets));
298 remain -= p->nlargeobj * sizeof(*h->large_offsets);
299 offset += p->nlargeobj * sizeof(*h->large_offsets);
302 if (remain < sizeof(*h->trailer)) {
303 err = got_error(GOT_ERR_BAD_PACKIDX);
308 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
310 h->trailer = malloc(sizeof(*h->trailer));
311 if (h->trailer == NULL) {
312 err = got_error_from_errno("malloc");
315 n = read(p->fd, h->trailer, sizeof(*h->trailer));
317 err = got_error_from_errno("read");
318 else if (n != sizeof(*h->trailer)) {
319 err = got_error(GOT_ERR_BAD_PACKIDX);
324 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
325 SHA1Final(sha1, &ctx);
326 if (memcmp(h->trailer->packidx_sha1, sha1,
327 SHA1_DIGEST_LENGTH) != 0)
328 err = got_error(GOT_ERR_PACKIDX_CSUM);
334 const struct got_error *
335 got_packidx_open(struct got_packidx **packidx,
336 int dir_fd, const char *relpath, int verify)
338 const struct got_error *err = NULL;
339 struct got_packidx *p = NULL;
341 struct stat idx_sb, pack_sb;
345 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
350 * Ensure that a corresponding pack file exists.
351 * Some Git repositories have this problem. Git seems to ignore
352 * the existence of lonely pack index files but we do not.
354 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
355 if (errno == ENOENT) {
356 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
359 err = got_error_from_errno2("fstatat", pack_relpath);
363 p = calloc(1, sizeof(*p));
365 err = got_error_from_errno("calloc");
369 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW);
371 err = got_error_from_errno2("openat", relpath);
376 if (fstat(p->fd, &idx_sb) != 0) {
377 err = got_error_from_errno2("fstat", relpath);
382 p->len = idx_sb.st_size;
383 if (p->len < sizeof(p->hdr)) {
384 err = got_error(GOT_ERR_BAD_PACKIDX);
390 p->path_packidx = strdup(relpath);
391 if (p->path_packidx == NULL) {
392 err = got_error_from_errno("strdup");
396 #ifndef GOT_PACK_NO_MMAP
397 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
398 if (p->map == MAP_FAILED) {
399 if (errno != ENOMEM) {
400 err = got_error_from_errno("mmap");
403 p->map = NULL; /* fall back to read(2) */
407 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
411 got_packidx_close(p);
418 const struct got_error *
419 got_packidx_close(struct got_packidx *packidx)
421 const struct got_error *err = NULL;
423 free(packidx->path_packidx);
425 if (munmap(packidx->map, packidx->len) == -1)
426 err = got_error_from_errno("munmap");
428 free(packidx->hdr.magic);
429 free(packidx->hdr.version);
430 free(packidx->hdr.fanout_table);
431 free(packidx->hdr.sorted_ids);
432 free(packidx->hdr.crc32);
433 free(packidx->hdr.offsets);
434 free(packidx->hdr.large_offsets);
435 free(packidx->hdr.trailer);
437 if (close(packidx->fd) == -1 && err == NULL)
438 err = got_error_from_errno("close");
444 const struct got_error *
445 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
449 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
450 size = strlen(path_packidx) + 2;
451 if (size < GOT_PACKFILE_NAMELEN + 1)
452 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
454 *path_packfile = malloc(size);
455 if (*path_packfile == NULL)
456 return got_error_from_errno("malloc");
458 /* Copy up to and excluding ".idx". */
459 if (strlcpy(*path_packfile, path_packidx,
460 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
461 return got_error(GOT_ERR_NO_SPACE);
463 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
464 return got_error(GOT_ERR_NO_SPACE);
470 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
472 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
473 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
475 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
476 if (idx < 0 || idx >= packidx->nlargeobj ||
477 packidx->hdr.large_offsets == NULL)
479 loffset = be64toh(packidx->hdr.large_offsets[idx]);
480 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
482 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
486 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
488 u_int8_t id0 = id->sha1[0];
489 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
490 int left = 0, right = totobj - 1;
493 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
495 while (left <= right) {
496 struct got_packidx_object_id *oid;
499 i = ((left + right) / 2);
500 oid = &packidx->hdr.sorted_ids[i];
501 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
513 const struct got_error *
514 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
515 struct got_packidx *packidx, const char *id_str_prefix)
517 const struct got_error *err = NULL;
519 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
521 size_t prefix_len = strlen(id_str_prefix);
522 struct got_packidx_object_id *oid;
525 STAILQ_INIT(matched_ids);
528 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
530 hex[0] = id_str_prefix[0];
531 hex[1] = id_str_prefix[1];
533 if (!got_parse_xdigit(&id0, hex))
534 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
536 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
537 oid = &packidx->hdr.sorted_ids[i];
538 while (i < totobj && oid->sha1[0] == id0) {
539 char id_str[SHA1_DIGEST_STRING_LENGTH];
540 struct got_object_qid *qid;
543 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
544 return got_error(GOT_ERR_NO_SPACE);
546 cmp = strncmp(id_str, id_str_prefix, prefix_len);
548 oid = &packidx->hdr.sorted_ids[++i];
553 err = got_object_qid_alloc_partial(&qid);
556 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
557 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
559 oid = &packidx->hdr.sorted_ids[++i];
563 got_object_id_queue_free(matched_ids);
567 static const struct got_error *
568 pack_stop_privsep_child(struct got_pack *pack)
570 const struct got_error *err = NULL;
572 if (pack->privsep_child == NULL)
575 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
578 err = got_privsep_wait_for_child(pack->privsep_child->pid);
579 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
580 err = got_error_from_errno("close");
581 imsg_clear(pack->privsep_child->ibuf);
582 free(pack->privsep_child->ibuf);
583 free(pack->privsep_child);
584 pack->privsep_child = NULL;
588 const struct got_error *
589 got_pack_close(struct got_pack *pack)
591 const struct got_error *err = NULL;
593 err = pack_stop_privsep_child(pack);
594 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
595 err = got_error_from_errno("munmap");
596 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
597 err = got_error_from_errno("close");
599 free(pack->path_packfile);
600 pack->path_packfile = NULL;
602 if (pack->delta_cache) {
603 got_delta_cache_free(pack->delta_cache);
604 pack->delta_cache = NULL;
610 const struct got_error *
611 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
612 struct got_pack *pack, off_t offset)
622 if (offset >= pack->filesize)
623 return got_error(GOT_ERR_PACK_OFFSET);
626 mapoff = (size_t)offset;
628 if (lseek(pack->fd, offset, SEEK_SET) == -1)
629 return got_error_from_errno("lseek");
633 /* We do not support size values which don't fit in 64 bit. */
635 return got_error(GOT_ERR_NO_SPACE);
638 sizeN = *(pack->map + mapoff);
639 mapoff += sizeof(sizeN);
641 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
643 return got_error_from_errno("read");
644 if (n != sizeof(sizeN))
645 return got_error(GOT_ERR_BAD_PACKFILE);
647 *len += sizeof(sizeN);
650 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
651 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
652 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
654 size_t shift = 4 + 7 * (i - 1);
655 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
658 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
665 static const struct got_error *
666 open_plain_object(struct got_object **obj, struct got_object_id *id,
667 uint8_t type, off_t offset, size_t size, int idx)
669 *obj = calloc(1, sizeof(**obj));
671 return got_error_from_errno("calloc");
674 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
675 (*obj)->pack_idx = idx;
678 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
679 (*obj)->pack_offset = offset;
684 static const struct got_error *
685 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
696 /* We do not support offset values which don't fit in 64 bit. */
698 return got_error(GOT_ERR_NO_SPACE);
702 if (delta_offset >= pack->filesize)
703 return got_error(GOT_ERR_PACK_OFFSET);
704 mapoff = (size_t)delta_offset + *len;
705 offN = *(pack->map + mapoff);
708 n = read(pack->fd, &offN, sizeof(offN));
710 return got_error_from_errno("read");
711 if (n != sizeof(offN))
712 return got_error(GOT_ERR_BAD_PACKFILE);
714 *len += sizeof(offN);
717 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
721 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
724 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
730 const struct got_error *
731 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
732 off_t offset, int tslen)
734 const struct got_error *err;
740 err = parse_negative_offset(&negoffset, &negofflen, pack,
745 /* Compute the base object's offset (must be in the same pack file). */
746 *base_offset = (offset - negoffset);
747 if (*base_offset <= 0)
748 return got_error(GOT_ERR_BAD_PACKFILE);
754 static const struct got_error *
755 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
756 size_t delta_data_offset, struct got_pack *pack)
758 const struct got_error *err = NULL;
761 if (delta_data_offset >= pack->filesize)
762 return got_error(GOT_ERR_PACK_OFFSET);
763 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
764 NULL, NULL, pack->map, delta_data_offset,
765 pack->filesize - delta_data_offset);
767 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
768 return got_error_from_errno("lseek");
769 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
775 static const struct got_error *
776 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
777 int delta_type, size_t delta_size, size_t delta_data_offset)
779 struct got_delta *delta;
781 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
784 return got_error_from_errno("got_delta_open");
785 /* delta is freed in got_object_close() */
787 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
791 static const struct got_error *
792 resolve_offset_delta(struct got_delta_chain *deltas,
793 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
794 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
797 const struct got_error *err;
802 off_t delta_data_offset;
805 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
806 delta_offset, tslen);
810 delta_data_offset = delta_offset + tslen + consumed;
811 if (delta_data_offset >= pack->filesize)
812 return got_error(GOT_ERR_PACK_OFFSET);
814 if (pack->map == NULL) {
815 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
816 if (delta_data_offset == -1)
817 return got_error_from_errno("lseek");
820 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
825 /* An offset delta must be in the same packfile. */
826 if (base_offset >= pack->filesize)
827 return got_error(GOT_ERR_PACK_OFFSET);
829 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
830 &base_tslen, pack, base_offset);
834 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
835 base_tslen, base_type, base_size, recursion - 1);
838 const struct got_error *
839 got_pack_parse_ref_delta(struct got_object_id *id,
840 struct got_pack *pack, off_t delta_offset, int tslen)
843 size_t mapoff = delta_offset + tslen;
844 memcpy(id, pack->map + mapoff, sizeof(*id));
847 n = read(pack->fd, id, sizeof(*id));
849 return got_error_from_errno("read");
850 if (n != sizeof(*id))
851 return got_error(GOT_ERR_BAD_PACKFILE);
857 static const struct got_error *
858 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
859 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
860 size_t delta_size, unsigned int recursion)
862 const struct got_error *err;
863 struct got_object_id id;
869 off_t delta_data_offset;
871 if (delta_offset + tslen >= pack->filesize)
872 return got_error(GOT_ERR_PACK_OFFSET);
874 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
878 delta_data_offset = delta_offset + tslen + sizeof(id);
880 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
881 if (delta_data_offset == -1)
882 return got_error_from_errno("lseek");
885 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
890 /* Delta base must be in the same pack file. */
891 idx = got_packidx_get_object_idx(packidx, &id);
893 return got_error(GOT_ERR_NO_OBJ);
895 base_offset = got_packidx_get_object_offset(packidx, idx);
896 if (base_offset == (uint64_t)-1)
897 return got_error(GOT_ERR_BAD_PACKIDX);
899 if (base_offset >= pack->filesize)
900 return got_error(GOT_ERR_PACK_OFFSET);
902 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
903 &base_tslen, pack, base_offset);
907 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
908 base_tslen, base_type, base_size, recursion - 1);
911 const struct got_error *
912 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
913 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
914 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
916 const struct got_error *err = NULL;
918 if (--recursion == 0)
919 return got_error(GOT_ERR_RECURSION);
921 switch (delta_type) {
922 case GOT_OBJ_TYPE_COMMIT:
923 case GOT_OBJ_TYPE_TREE:
924 case GOT_OBJ_TYPE_BLOB:
925 case GOT_OBJ_TYPE_TAG:
926 /* Plain types are the final delta base. Recursion ends. */
927 err = add_delta(deltas, delta_offset, tslen, delta_type,
930 case GOT_OBJ_TYPE_OFFSET_DELTA:
931 err = resolve_offset_delta(deltas, packidx, pack,
932 delta_offset, tslen, delta_type, delta_size, recursion - 1);
934 case GOT_OBJ_TYPE_REF_DELTA:
935 err = resolve_ref_delta(deltas, packidx, pack,
936 delta_offset, tslen, delta_type, delta_size, recursion - 1);
939 return got_error(GOT_ERR_OBJ_TYPE);
945 static const struct got_error *
946 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
947 struct got_pack *pack, struct got_object_id *id, off_t offset,
948 size_t tslen, int delta_type, size_t delta_size, int idx)
950 const struct got_error *err = NULL;
953 *obj = calloc(1, sizeof(**obj));
955 return got_error_from_errno("calloc");
959 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
960 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
961 (*obj)->pack_offset = offset + tslen;
963 STAILQ_INIT(&(*obj)->deltas.entries);
964 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
965 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
966 (*obj)->pack_idx = idx;
968 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
969 offset, tslen, delta_type, delta_size,
970 GOT_DELTA_CHAIN_RECURSION_MAX);
974 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
977 (*obj)->type = resolved_type;
980 got_object_close(*obj);
986 const struct got_error *
987 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
988 struct got_packidx *packidx, int idx, struct got_object_id *id)
990 const struct got_error *err = NULL;
998 offset = got_packidx_get_object_offset(packidx, idx);
999 if (offset == (uint64_t)-1)
1000 return got_error(GOT_ERR_BAD_PACKIDX);
1002 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1008 case GOT_OBJ_TYPE_COMMIT:
1009 case GOT_OBJ_TYPE_TREE:
1010 case GOT_OBJ_TYPE_BLOB:
1011 case GOT_OBJ_TYPE_TAG:
1012 err = open_plain_object(obj, id, type, offset + tslen,
1015 case GOT_OBJ_TYPE_OFFSET_DELTA:
1016 case GOT_OBJ_TYPE_REF_DELTA:
1017 err = open_delta_object(obj, packidx, pack, id, offset,
1018 tslen, type, size, idx);
1021 err = got_error(GOT_ERR_OBJ_TYPE);
1028 const struct got_error *
1029 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
1030 struct got_pack *pack)
1032 struct got_delta *delta;
1033 uint64_t base_size = 0, result_size = 0;
1036 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1037 /* Plain object types are the delta base. */
1038 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1039 delta->type != GOT_OBJ_TYPE_TREE &&
1040 delta->type != GOT_OBJ_TYPE_BLOB &&
1041 delta->type != GOT_OBJ_TYPE_TAG) {
1042 const struct got_error *err;
1047 got_delta_cache_get(&delta_buf, &delta_len,
1048 pack->delta_cache, delta->data_offset);
1049 if (delta_buf == NULL) {
1051 err = read_delta_data(&delta_buf, &delta_len,
1052 delta->data_offset, pack);
1055 err = got_delta_cache_add(pack->delta_cache,
1056 delta->data_offset, delta_buf, delta_len);
1059 else if (err->code != GOT_ERR_NO_SPACE) {
1064 err = got_delta_get_sizes(&base_size, &result_size,
1065 delta_buf, delta_len);
1071 base_size = delta->size;
1072 if (base_size > *max_size)
1073 *max_size = base_size;
1074 if (result_size > *max_size)
1075 *max_size = result_size;
1081 const struct got_error *
1082 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1083 struct got_pack *pack)
1085 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1086 return got_error(GOT_ERR_OBJ_TYPE);
1088 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1091 const struct got_error *
1092 got_pack_dump_delta_chain_to_file(size_t *result_size,
1093 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1094 FILE *base_file, FILE *accum_file)
1096 const struct got_error *err = NULL;
1097 struct got_delta *delta;
1098 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1099 size_t base_bufsz = 0, accum_size = 0, delta_len;
1105 if (STAILQ_EMPTY(&deltas->entries))
1106 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1108 /* We process small enough files entirely in memory for speed. */
1109 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1112 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1113 accum_buf = malloc(max_size);
1114 if (accum_buf == NULL)
1115 return got_error_from_errno("malloc");
1120 /* Deltas are ordered in ascending order. */
1121 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1125 off_t delta_data_offset;
1127 /* Plain object types are the delta base. */
1128 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1129 delta->type != GOT_OBJ_TYPE_TREE &&
1130 delta->type != GOT_OBJ_TYPE_BLOB &&
1131 delta->type != GOT_OBJ_TYPE_TAG) {
1132 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1136 delta_data_offset = delta->offset + delta->tslen;
1137 if (delta_data_offset >= pack->filesize) {
1138 err = got_error(GOT_ERR_PACK_OFFSET);
1141 if (pack->map == NULL) {
1142 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1144 err = got_error_from_errno("lseek");
1150 mapoff = (size_t)delta_data_offset;
1151 err = got_inflate_to_file_mmap(
1152 &base_bufsz, NULL, NULL, pack->map,
1153 mapoff, pack->filesize - mapoff,
1156 err = got_inflate_to_file_fd(
1157 &base_bufsz, NULL, NULL, pack->fd,
1161 mapoff = (size_t)delta_data_offset;
1162 err = got_inflate_to_mem_mmap(&base_buf,
1163 &base_bufsz, NULL, NULL,
1165 pack->filesize - mapoff);
1167 err = got_inflate_to_mem_fd(&base_buf,
1168 &base_bufsz, NULL, NULL, max_size,
1179 got_delta_cache_get(&delta_buf, &delta_len,
1180 pack->delta_cache, delta->data_offset);
1181 if (delta_buf == NULL) {
1183 err = read_delta_data(&delta_buf, &delta_len,
1184 delta->data_offset, pack);
1187 err = got_delta_cache_add(pack->delta_cache,
1188 delta->data_offset, delta_buf, delta_len);
1191 else if (err->code != GOT_ERR_NO_SPACE) {
1197 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1198 delta_buf, delta_len, accum_buf,
1199 &accum_size, max_size);
1202 err = got_delta_apply(base_file, delta_buf,
1204 /* Final delta application writes to output file. */
1205 ++n < deltas->nentries ? accum_file : outfile,
1213 if (n < deltas->nentries) {
1214 /* Accumulated delta becomes the new base. */
1216 uint8_t *tmp = accum_buf;
1218 * Base buffer switches roles with accumulation
1219 * buffer. Ensure it can hold the largest
1220 * result in the delta chain. The initial
1221 * allocation might have been smaller.
1223 if (base_bufsz < max_size) {
1225 p = reallocarray(base_buf, 1, max_size);
1227 err = got_error_from_errno(
1232 base_bufsz = max_size;
1234 accum_buf = base_buf;
1237 FILE *tmp = accum_file;
1238 accum_file = base_file;
1249 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1251 if (len != accum_size)
1252 err = got_ferror(outfile, GOT_ERR_IO);
1256 *result_size = accum_size;
1260 const struct got_error *
1261 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1262 struct got_delta_chain *deltas, struct got_pack *pack)
1264 const struct got_error *err = NULL;
1265 struct got_delta *delta;
1266 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1267 size_t base_bufsz = 0, accum_size = 0, delta_len;
1274 if (STAILQ_EMPTY(&deltas->entries))
1275 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1277 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1280 accum_buf = malloc(max_size);
1281 if (accum_buf == NULL)
1282 return got_error_from_errno("malloc");
1284 /* Deltas are ordered in ascending order. */
1285 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1288 size_t delta_data_offset;
1290 /* Plain object types are the delta base. */
1291 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1292 delta->type != GOT_OBJ_TYPE_TREE &&
1293 delta->type != GOT_OBJ_TYPE_BLOB &&
1294 delta->type != GOT_OBJ_TYPE_TAG) {
1295 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1299 delta_data_offset = delta->offset + delta->tslen;
1300 if (delta_data_offset >= pack->filesize) {
1301 err = got_error(GOT_ERR_PACK_OFFSET);
1305 size_t mapoff = (size_t)delta_data_offset;
1306 err = got_inflate_to_mem_mmap(&base_buf,
1307 &base_bufsz, NULL, NULL, pack->map,
1308 mapoff, pack->filesize - mapoff);
1310 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1312 err = got_error_from_errno("lseek");
1315 err = got_inflate_to_mem_fd(&base_buf,
1316 &base_bufsz, NULL, NULL, max_size,
1325 got_delta_cache_get(&delta_buf, &delta_len,
1326 pack->delta_cache, delta->data_offset);
1327 if (delta_buf == NULL) {
1329 err = read_delta_data(&delta_buf, &delta_len,
1330 delta->data_offset, pack);
1333 err = got_delta_cache_add(pack->delta_cache,
1334 delta->data_offset, delta_buf, delta_len);
1337 else if (err->code != GOT_ERR_NO_SPACE) {
1342 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1343 delta_buf, delta_len, accum_buf,
1344 &accum_size, max_size);
1351 if (n < deltas->nentries) {
1352 /* Accumulated delta becomes the new base. */
1353 uint8_t *tmp = accum_buf;
1355 * Base buffer switches roles with accumulation buffer.
1356 * Ensure it can hold the largest result in the delta
1357 * chain. Initial allocation might have been smaller.
1359 if (base_bufsz < max_size) {
1361 p = reallocarray(base_buf, 1, max_size);
1363 err = got_error_from_errno(
1368 base_bufsz = max_size;
1370 accum_buf = base_buf;
1382 *outbuf = accum_buf;
1383 *outlen = accum_size;
1388 const struct got_error *
1389 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1390 FILE *outfile, FILE *base_file, FILE *accum_file)
1392 const struct got_error *err = NULL;
1394 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1395 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1397 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1398 if (obj->pack_offset >= pack->filesize)
1399 return got_error(GOT_ERR_PACK_OFFSET);
1402 size_t mapoff = (size_t)obj->pack_offset;
1403 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1404 pack->map, mapoff, pack->filesize - mapoff,
1407 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1408 return got_error_from_errno("lseek");
1409 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1413 err = got_pack_dump_delta_chain_to_file(&obj->size,
1414 &obj->deltas, pack, outfile, base_file, accum_file);
1419 const struct got_error *
1420 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1421 struct got_object *obj, struct got_pack *pack)
1423 const struct got_error *err = NULL;
1425 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1426 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1428 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1429 if (obj->pack_offset >= pack->filesize)
1430 return got_error(GOT_ERR_PACK_OFFSET);
1432 size_t mapoff = (size_t)obj->pack_offset;
1433 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1434 pack->map, mapoff, pack->filesize - mapoff);
1436 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1437 return got_error_from_errno("lseek");
1438 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1439 obj->size, pack->fd);
1442 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,