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, off_t packfile_size)
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 if (verify || packfile_size > 0x7fffffff) {
262 for (i = 0; i < nobj; i++) {
263 uint32_t o = h->offsets[i];
264 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
268 if (p->nlargeobj == 0)
270 else if (packfile_size <= 0x7fffffff) {
271 err = got_error(GOT_ERR_BAD_PACKIDX);
275 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
276 err = got_error(GOT_ERR_BAD_PACKIDX);
280 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
282 h->large_offsets = malloc(p->nlargeobj *
283 sizeof(*h->large_offsets));
284 if (h->large_offsets == NULL) {
285 err = got_error_from_errno("malloc");
288 n = read(p->fd, h->large_offsets,
289 p->nlargeobj * sizeof(*h->large_offsets));
291 err = got_error_from_errno("read");
292 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
293 err = got_error(GOT_ERR_BAD_PACKIDX);
298 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
299 p->nlargeobj * sizeof(*h->large_offsets));
300 remain -= p->nlargeobj * sizeof(*h->large_offsets);
301 offset += p->nlargeobj * sizeof(*h->large_offsets);
304 if (remain < sizeof(*h->trailer)) {
305 err = got_error(GOT_ERR_BAD_PACKIDX);
310 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
312 h->trailer = malloc(sizeof(*h->trailer));
313 if (h->trailer == NULL) {
314 err = got_error_from_errno("malloc");
317 n = read(p->fd, h->trailer, sizeof(*h->trailer));
319 err = got_error_from_errno("read");
320 else if (n != sizeof(*h->trailer)) {
321 err = got_error(GOT_ERR_BAD_PACKIDX);
326 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
327 SHA1Final(sha1, &ctx);
328 if (memcmp(h->trailer->packidx_sha1, sha1,
329 SHA1_DIGEST_LENGTH) != 0)
330 err = got_error(GOT_ERR_PACKIDX_CSUM);
336 const struct got_error *
337 got_packidx_open(struct got_packidx **packidx,
338 int dir_fd, const char *relpath, int verify)
340 const struct got_error *err = NULL;
341 struct got_packidx *p = NULL;
343 struct stat idx_sb, pack_sb;
347 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
352 * Ensure that a corresponding pack file exists.
353 * Some Git repositories have this problem. Git seems to ignore
354 * the existence of lonely pack index files but we do not.
356 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
357 if (errno == ENOENT) {
358 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
361 err = got_error_from_errno2("fstatat", pack_relpath);
365 p = calloc(1, sizeof(*p));
367 err = got_error_from_errno("calloc");
371 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
373 err = got_error_from_errno2("openat", relpath);
378 if (fstat(p->fd, &idx_sb) != 0) {
379 err = got_error_from_errno2("fstat", relpath);
384 p->len = idx_sb.st_size;
385 if (p->len < sizeof(p->hdr)) {
386 err = got_error(GOT_ERR_BAD_PACKIDX);
392 p->path_packidx = strdup(relpath);
393 if (p->path_packidx == NULL) {
394 err = got_error_from_errno("strdup");
398 #ifndef GOT_PACK_NO_MMAP
399 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
400 if (p->map == MAP_FAILED) {
401 if (errno != ENOMEM) {
402 err = got_error_from_errno("mmap");
405 p->map = NULL; /* fall back to read(2) */
409 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
413 got_packidx_close(p);
420 const struct got_error *
421 got_packidx_close(struct got_packidx *packidx)
423 const struct got_error *err = NULL;
425 free(packidx->path_packidx);
427 if (munmap(packidx->map, packidx->len) == -1)
428 err = got_error_from_errno("munmap");
430 free(packidx->hdr.magic);
431 free(packidx->hdr.version);
432 free(packidx->hdr.fanout_table);
433 free(packidx->hdr.sorted_ids);
434 free(packidx->hdr.crc32);
435 free(packidx->hdr.offsets);
436 free(packidx->hdr.large_offsets);
437 free(packidx->hdr.trailer);
439 if (close(packidx->fd) == -1 && err == NULL)
440 err = got_error_from_errno("close");
446 const struct got_error *
447 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
451 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
452 size = strlen(path_packidx) + 2;
453 if (size < GOT_PACKFILE_NAMELEN + 1)
454 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
456 *path_packfile = malloc(size);
457 if (*path_packfile == NULL)
458 return got_error_from_errno("malloc");
460 /* Copy up to and excluding ".idx". */
461 if (strlcpy(*path_packfile, path_packidx,
462 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
463 return got_error(GOT_ERR_NO_SPACE);
465 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
466 return got_error(GOT_ERR_NO_SPACE);
472 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
474 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
475 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
477 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
478 if (idx < 0 || idx >= packidx->nlargeobj ||
479 packidx->hdr.large_offsets == NULL)
481 loffset = be64toh(packidx->hdr.large_offsets[idx]);
482 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
484 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
488 got_packidx_get_object_idx(struct got_packidx *packidx,
489 struct got_object_id *id)
491 u_int8_t id0 = id->sha1[0];
492 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
493 int left = 0, right = totobj - 1;
496 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
498 while (left <= right) {
499 struct got_packidx_object_id *oid;
502 i = ((left + right) / 2);
503 oid = &packidx->hdr.sorted_ids[i];
504 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
516 const struct got_error *
517 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
518 struct got_packidx *packidx, const char *id_str_prefix)
520 const struct got_error *err = NULL;
522 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
524 size_t prefix_len = strlen(id_str_prefix);
525 struct got_packidx_object_id *oid;
528 STAILQ_INIT(matched_ids);
531 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
533 hex[0] = id_str_prefix[0];
534 hex[1] = id_str_prefix[1];
536 if (!got_parse_xdigit(&id0, hex))
537 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
540 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
541 oid = &packidx->hdr.sorted_ids[i];
542 while (i < totobj && oid->sha1[0] == id0) {
543 char id_str[SHA1_DIGEST_STRING_LENGTH];
544 struct got_object_qid *qid;
547 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
548 return got_error(GOT_ERR_NO_SPACE);
550 cmp = strncmp(id_str, id_str_prefix, prefix_len);
552 oid = &packidx->hdr.sorted_ids[++i];
557 err = got_object_qid_alloc_partial(&qid);
560 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
561 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
563 oid = &packidx->hdr.sorted_ids[++i];
567 got_object_id_queue_free(matched_ids);
571 static const struct got_error *
572 pack_stop_privsep_child(struct got_pack *pack)
574 const struct got_error *err = NULL;
576 if (pack->privsep_child == NULL)
579 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
582 err = got_privsep_wait_for_child(pack->privsep_child->pid);
583 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
584 err = got_error_from_errno("close");
585 imsg_clear(pack->privsep_child->ibuf);
586 free(pack->privsep_child->ibuf);
587 free(pack->privsep_child);
588 pack->privsep_child = NULL;
592 const struct got_error *
593 got_pack_close(struct got_pack *pack)
595 const struct got_error *err = NULL;
597 err = pack_stop_privsep_child(pack);
598 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
599 err = got_error_from_errno("munmap");
600 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
601 err = got_error_from_errno("close");
603 free(pack->path_packfile);
604 pack->path_packfile = NULL;
606 if (pack->delta_cache) {
607 got_delta_cache_free(pack->delta_cache);
608 pack->delta_cache = NULL;
614 const struct got_error *
615 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
616 struct got_pack *pack, off_t offset)
626 if (offset >= pack->filesize)
627 return got_error(GOT_ERR_PACK_OFFSET);
630 mapoff = (size_t)offset;
632 if (lseek(pack->fd, offset, SEEK_SET) == -1)
633 return got_error_from_errno("lseek");
637 /* We do not support size values which don't fit in 64 bit. */
639 return got_error(GOT_ERR_NO_SPACE);
642 if (mapoff + sizeof(sizeN) >= pack->filesize)
643 return got_error(GOT_ERR_BAD_PACKFILE);
644 sizeN = *(pack->map + mapoff);
645 mapoff += sizeof(sizeN);
647 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
649 return got_error_from_errno("read");
650 if (n != sizeof(sizeN))
651 return got_error(GOT_ERR_BAD_PACKFILE);
653 *len += sizeof(sizeN);
656 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
657 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
658 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
660 size_t shift = 4 + 7 * (i - 1);
661 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
664 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
671 static const struct got_error *
672 open_plain_object(struct got_object **obj, struct got_object_id *id,
673 uint8_t type, off_t offset, size_t size, int idx)
675 *obj = calloc(1, sizeof(**obj));
677 return got_error_from_errno("calloc");
680 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
681 (*obj)->pack_idx = idx;
684 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
685 (*obj)->pack_offset = offset;
690 static const struct got_error *
691 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
702 /* We do not support offset values which don't fit in 64 bit. */
704 return got_error(GOT_ERR_NO_SPACE);
708 mapoff = (size_t)delta_offset + *len;
709 if (mapoff + sizeof(offN) >= pack->filesize)
710 return got_error(GOT_ERR_PACK_OFFSET);
711 offN = *(pack->map + mapoff);
714 n = read(pack->fd, &offN, sizeof(offN));
716 return got_error_from_errno("read");
717 if (n != sizeof(offN))
718 return got_error(GOT_ERR_BAD_PACKFILE);
720 *len += sizeof(offN);
723 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
727 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
730 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
736 const struct got_error *
737 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
738 struct got_pack *pack, off_t offset, int tslen)
740 const struct got_error *err;
746 err = parse_negative_offset(&negoffset, &negofflen, pack,
751 /* Compute the base object's offset (must be in the same pack file). */
752 *base_offset = (offset - negoffset);
753 if (*base_offset <= 0)
754 return got_error(GOT_ERR_BAD_PACKFILE);
760 static const struct got_error *
761 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
762 size_t delta_data_offset, struct got_pack *pack)
764 const struct got_error *err = NULL;
767 if (delta_data_offset >= pack->filesize)
768 return got_error(GOT_ERR_PACK_OFFSET);
769 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
770 NULL, NULL, pack->map, delta_data_offset,
771 pack->filesize - delta_data_offset);
773 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
774 return got_error_from_errno("lseek");
775 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
781 static const struct got_error *
782 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
783 int delta_type, size_t delta_size, size_t delta_data_offset)
785 struct got_delta *delta;
787 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
790 return got_error_from_errno("got_delta_open");
791 /* delta is freed in got_object_close() */
793 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
797 static const struct got_error *
798 resolve_offset_delta(struct got_delta_chain *deltas,
799 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
800 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
803 const struct got_error *err;
808 off_t delta_data_offset;
811 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
812 delta_offset, tslen);
816 delta_data_offset = delta_offset + tslen + consumed;
817 if (delta_data_offset >= pack->filesize)
818 return got_error(GOT_ERR_PACK_OFFSET);
820 if (pack->map == NULL) {
821 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
822 if (delta_data_offset == -1)
823 return got_error_from_errno("lseek");
826 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
831 /* An offset delta must be in the same packfile. */
832 if (base_offset >= pack->filesize)
833 return got_error(GOT_ERR_PACK_OFFSET);
835 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
836 &base_tslen, pack, base_offset);
840 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
841 base_tslen, base_type, base_size, recursion - 1);
844 const struct got_error *
845 got_pack_parse_ref_delta(struct got_object_id *id,
846 struct got_pack *pack, off_t delta_offset, int tslen)
849 size_t mapoff = delta_offset + tslen;
850 if (mapoff + sizeof(*id) >= pack->filesize)
851 return got_error(GOT_ERR_PACK_OFFSET);
852 memcpy(id, pack->map + mapoff, sizeof(*id));
855 n = read(pack->fd, id, sizeof(*id));
857 return got_error_from_errno("read");
858 if (n != sizeof(*id))
859 return got_error(GOT_ERR_BAD_PACKFILE);
865 static const struct got_error *
866 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
867 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
868 size_t delta_size, unsigned int recursion)
870 const struct got_error *err;
871 struct got_object_id id;
877 off_t delta_data_offset;
879 if (delta_offset + tslen >= pack->filesize)
880 return got_error(GOT_ERR_PACK_OFFSET);
882 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
886 delta_data_offset = delta_offset + tslen + sizeof(id);
888 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
889 if (delta_data_offset == -1)
890 return got_error_from_errno("lseek");
893 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
898 /* Delta base must be in the same pack file. */
899 idx = got_packidx_get_object_idx(packidx, &id);
901 return got_error(GOT_ERR_NO_OBJ);
903 base_offset = got_packidx_get_object_offset(packidx, idx);
904 if (base_offset == (uint64_t)-1)
905 return got_error(GOT_ERR_BAD_PACKIDX);
907 if (base_offset >= pack->filesize)
908 return got_error(GOT_ERR_PACK_OFFSET);
910 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
911 &base_tslen, pack, base_offset);
915 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
916 base_tslen, base_type, base_size, recursion - 1);
919 const struct got_error *
920 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
921 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
922 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
924 const struct got_error *err = NULL;
926 if (--recursion == 0)
927 return got_error(GOT_ERR_RECURSION);
929 switch (delta_type) {
930 case GOT_OBJ_TYPE_COMMIT:
931 case GOT_OBJ_TYPE_TREE:
932 case GOT_OBJ_TYPE_BLOB:
933 case GOT_OBJ_TYPE_TAG:
934 /* Plain types are the final delta base. Recursion ends. */
935 err = add_delta(deltas, delta_offset, tslen, delta_type,
938 case GOT_OBJ_TYPE_OFFSET_DELTA:
939 err = resolve_offset_delta(deltas, packidx, pack,
940 delta_offset, tslen, delta_type, delta_size, recursion - 1);
942 case GOT_OBJ_TYPE_REF_DELTA:
943 err = resolve_ref_delta(deltas, packidx, pack,
944 delta_offset, tslen, delta_type, delta_size, recursion - 1);
947 return got_error(GOT_ERR_OBJ_TYPE);
953 static const struct got_error *
954 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
955 struct got_pack *pack, struct got_object_id *id, off_t offset,
956 size_t tslen, int delta_type, size_t delta_size, int idx)
958 const struct got_error *err = NULL;
961 *obj = calloc(1, sizeof(**obj));
963 return got_error_from_errno("calloc");
967 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
968 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
969 (*obj)->pack_offset = offset + tslen;
971 STAILQ_INIT(&(*obj)->deltas.entries);
972 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
973 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
974 (*obj)->pack_idx = idx;
976 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
977 offset, tslen, delta_type, delta_size,
978 GOT_DELTA_CHAIN_RECURSION_MAX);
982 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
985 (*obj)->type = resolved_type;
988 got_object_close(*obj);
994 const struct got_error *
995 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
996 struct got_packidx *packidx, int idx, struct got_object_id *id)
998 const struct got_error *err = NULL;
1006 offset = got_packidx_get_object_offset(packidx, idx);
1007 if (offset == (uint64_t)-1)
1008 return got_error(GOT_ERR_BAD_PACKIDX);
1010 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1016 case GOT_OBJ_TYPE_COMMIT:
1017 case GOT_OBJ_TYPE_TREE:
1018 case GOT_OBJ_TYPE_BLOB:
1019 case GOT_OBJ_TYPE_TAG:
1020 err = open_plain_object(obj, id, type, offset + tslen,
1023 case GOT_OBJ_TYPE_OFFSET_DELTA:
1024 case GOT_OBJ_TYPE_REF_DELTA:
1025 err = open_delta_object(obj, packidx, pack, id, offset,
1026 tslen, type, size, idx);
1029 err = got_error(GOT_ERR_OBJ_TYPE);
1036 const struct got_error *
1037 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1038 struct got_delta_chain *deltas, struct got_pack *pack)
1040 struct got_delta *delta;
1041 uint64_t base_size = 0, result_size = 0;
1044 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1045 /* Plain object types are the delta base. */
1046 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1047 delta->type != GOT_OBJ_TYPE_TREE &&
1048 delta->type != GOT_OBJ_TYPE_BLOB &&
1049 delta->type != GOT_OBJ_TYPE_TAG) {
1050 const struct got_error *err;
1055 got_delta_cache_get(&delta_buf, &delta_len,
1056 pack->delta_cache, delta->data_offset);
1057 if (delta_buf == NULL) {
1059 err = read_delta_data(&delta_buf, &delta_len,
1060 delta->data_offset, pack);
1063 err = got_delta_cache_add(pack->delta_cache,
1064 delta->data_offset, delta_buf, delta_len);
1067 else if (err->code != GOT_ERR_NO_SPACE) {
1072 err = got_delta_get_sizes(&base_size, &result_size,
1073 delta_buf, delta_len);
1079 base_size = delta->size;
1080 if (base_size > *max_size)
1081 *max_size = base_size;
1082 if (result_size > *max_size)
1083 *max_size = result_size;
1089 const struct got_error *
1090 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1091 struct got_pack *pack)
1093 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1094 return got_error(GOT_ERR_OBJ_TYPE);
1096 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1099 const struct got_error *
1100 got_pack_dump_delta_chain_to_file(size_t *result_size,
1101 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1102 FILE *base_file, FILE *accum_file)
1104 const struct got_error *err = NULL;
1105 struct got_delta *delta;
1106 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1107 size_t base_bufsz = 0, accum_size = 0, delta_len;
1113 if (STAILQ_EMPTY(&deltas->entries))
1114 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1116 /* We process small enough files entirely in memory for speed. */
1117 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1120 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1121 accum_buf = malloc(max_size);
1122 if (accum_buf == NULL)
1123 return got_error_from_errno("malloc");
1127 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1128 return got_error_from_errno("fseeko");
1129 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1130 return got_error_from_errno("fseeko");
1133 /* Deltas are ordered in ascending order. */
1134 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1138 off_t delta_data_offset;
1140 /* Plain object types are the delta base. */
1141 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1142 delta->type != GOT_OBJ_TYPE_TREE &&
1143 delta->type != GOT_OBJ_TYPE_BLOB &&
1144 delta->type != GOT_OBJ_TYPE_TAG) {
1145 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1149 delta_data_offset = delta->offset + delta->tslen;
1150 if (delta_data_offset >= pack->filesize) {
1151 err = got_error(GOT_ERR_PACK_OFFSET);
1154 if (pack->map == NULL) {
1155 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1157 err = got_error_from_errno("lseek");
1163 mapoff = (size_t)delta_data_offset;
1164 err = got_inflate_to_file_mmap(
1165 &base_bufsz, NULL, NULL, pack->map,
1166 mapoff, pack->filesize - mapoff,
1169 err = got_inflate_to_file_fd(
1170 &base_bufsz, NULL, NULL, pack->fd,
1174 mapoff = (size_t)delta_data_offset;
1175 err = got_inflate_to_mem_mmap(&base_buf,
1176 &base_bufsz, NULL, NULL,
1178 pack->filesize - mapoff);
1180 err = got_inflate_to_mem_fd(&base_buf,
1181 &base_bufsz, NULL, NULL, max_size,
1192 got_delta_cache_get(&delta_buf, &delta_len,
1193 pack->delta_cache, delta->data_offset);
1194 if (delta_buf == NULL) {
1196 err = read_delta_data(&delta_buf, &delta_len,
1197 delta->data_offset, pack);
1200 err = got_delta_cache_add(pack->delta_cache,
1201 delta->data_offset, delta_buf, delta_len);
1204 else if (err->code != GOT_ERR_NO_SPACE) {
1210 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1211 delta_buf, delta_len, accum_buf,
1212 &accum_size, max_size);
1215 err = got_delta_apply(base_file, delta_buf,
1217 /* Final delta application writes to output file. */
1218 ++n < deltas->nentries ? accum_file : outfile,
1226 if (n < deltas->nentries) {
1227 /* Accumulated delta becomes the new base. */
1229 uint8_t *tmp = accum_buf;
1231 * Base buffer switches roles with accumulation
1232 * buffer. Ensure it can hold the largest
1233 * result in the delta chain. The initial
1234 * allocation might have been smaller.
1236 if (base_bufsz < max_size) {
1238 p = reallocarray(base_buf, 1, max_size);
1240 err = got_error_from_errno(
1245 base_bufsz = max_size;
1247 accum_buf = base_buf;
1250 FILE *tmp = accum_file;
1251 accum_file = base_file;
1262 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1264 if (len != accum_size)
1265 err = got_ferror(outfile, GOT_ERR_IO);
1269 *result_size = accum_size;
1273 const struct got_error *
1274 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1275 struct got_delta_chain *deltas, struct got_pack *pack)
1277 const struct got_error *err = NULL;
1278 struct got_delta *delta;
1279 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1280 size_t base_bufsz = 0, accum_size = 0, delta_len;
1287 if (STAILQ_EMPTY(&deltas->entries))
1288 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1290 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1293 accum_buf = malloc(max_size);
1294 if (accum_buf == NULL)
1295 return got_error_from_errno("malloc");
1297 /* Deltas are ordered in ascending order. */
1298 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1301 size_t delta_data_offset;
1303 /* Plain object types are the delta base. */
1304 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1305 delta->type != GOT_OBJ_TYPE_TREE &&
1306 delta->type != GOT_OBJ_TYPE_BLOB &&
1307 delta->type != GOT_OBJ_TYPE_TAG) {
1308 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1312 delta_data_offset = delta->offset + delta->tslen;
1313 if (delta_data_offset >= pack->filesize) {
1314 err = got_error(GOT_ERR_PACK_OFFSET);
1318 size_t mapoff = (size_t)delta_data_offset;
1319 err = got_inflate_to_mem_mmap(&base_buf,
1320 &base_bufsz, NULL, NULL, pack->map,
1321 mapoff, pack->filesize - mapoff);
1323 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1325 err = got_error_from_errno("lseek");
1328 err = got_inflate_to_mem_fd(&base_buf,
1329 &base_bufsz, NULL, NULL, max_size,
1338 got_delta_cache_get(&delta_buf, &delta_len,
1339 pack->delta_cache, delta->data_offset);
1340 if (delta_buf == NULL) {
1342 err = read_delta_data(&delta_buf, &delta_len,
1343 delta->data_offset, pack);
1346 err = got_delta_cache_add(pack->delta_cache,
1347 delta->data_offset, delta_buf, delta_len);
1350 else if (err->code != GOT_ERR_NO_SPACE) {
1355 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1356 delta_buf, delta_len, accum_buf,
1357 &accum_size, max_size);
1364 if (n < deltas->nentries) {
1365 /* Accumulated delta becomes the new base. */
1366 uint8_t *tmp = accum_buf;
1368 * Base buffer switches roles with accumulation buffer.
1369 * Ensure it can hold the largest result in the delta
1370 * chain. Initial allocation might have been smaller.
1372 if (base_bufsz < max_size) {
1374 p = reallocarray(base_buf, 1, max_size);
1376 err = got_error_from_errno(
1381 base_bufsz = max_size;
1383 accum_buf = base_buf;
1395 *outbuf = accum_buf;
1396 *outlen = accum_size;
1401 const struct got_error *
1402 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1403 FILE *outfile, FILE *base_file, FILE *accum_file)
1405 const struct got_error *err = NULL;
1407 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1408 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1410 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1411 if (obj->pack_offset >= pack->filesize)
1412 return got_error(GOT_ERR_PACK_OFFSET);
1415 size_t mapoff = (size_t)obj->pack_offset;
1416 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1417 pack->map, mapoff, pack->filesize - mapoff,
1420 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1421 return got_error_from_errno("lseek");
1422 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1426 err = got_pack_dump_delta_chain_to_file(&obj->size,
1427 &obj->deltas, pack, outfile, base_file, accum_file);
1432 const struct got_error *
1433 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1434 struct got_object *obj, struct got_pack *pack)
1436 const struct got_error *err = NULL;
1438 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1439 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1441 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1442 if (obj->pack_offset >= pack->filesize)
1443 return got_error(GOT_ERR_PACK_OFFSET);
1445 size_t mapoff = (size_t)obj->pack_offset;
1446 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1447 pack->map, mapoff, pack->filesize - mapoff);
1449 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1450 return got_error_from_errno("lseek");
1451 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1452 obj->size, pack->fd);
1455 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,