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);
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, struct got_object_id *id)
490 u_int8_t id0 = id->sha1[0];
491 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
492 int left = 0, right = totobj - 1;
495 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
497 while (left <= right) {
498 struct got_packidx_object_id *oid;
501 i = ((left + right) / 2);
502 oid = &packidx->hdr.sorted_ids[i];
503 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
515 const struct got_error *
516 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
517 struct got_packidx *packidx, const char *id_str_prefix)
519 const struct got_error *err = NULL;
521 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
523 size_t prefix_len = strlen(id_str_prefix);
524 struct got_packidx_object_id *oid;
527 STAILQ_INIT(matched_ids);
530 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
532 hex[0] = id_str_prefix[0];
533 hex[1] = id_str_prefix[1];
535 if (!got_parse_xdigit(&id0, hex))
536 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
538 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
539 oid = &packidx->hdr.sorted_ids[i];
540 while (i < totobj && oid->sha1[0] == id0) {
541 char id_str[SHA1_DIGEST_STRING_LENGTH];
542 struct got_object_qid *qid;
545 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
546 return got_error(GOT_ERR_NO_SPACE);
548 cmp = strncmp(id_str, id_str_prefix, prefix_len);
550 oid = &packidx->hdr.sorted_ids[++i];
555 err = got_object_qid_alloc_partial(&qid);
558 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
559 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
561 oid = &packidx->hdr.sorted_ids[++i];
565 got_object_id_queue_free(matched_ids);
569 static const struct got_error *
570 pack_stop_privsep_child(struct got_pack *pack)
572 const struct got_error *err = NULL;
574 if (pack->privsep_child == NULL)
577 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
580 err = got_privsep_wait_for_child(pack->privsep_child->pid);
581 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
582 err = got_error_from_errno("close");
583 imsg_clear(pack->privsep_child->ibuf);
584 free(pack->privsep_child->ibuf);
585 free(pack->privsep_child);
586 pack->privsep_child = NULL;
590 const struct got_error *
591 got_pack_close(struct got_pack *pack)
593 const struct got_error *err = NULL;
595 err = pack_stop_privsep_child(pack);
596 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
597 err = got_error_from_errno("munmap");
598 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
599 err = got_error_from_errno("close");
601 free(pack->path_packfile);
602 pack->path_packfile = NULL;
604 if (pack->delta_cache) {
605 got_delta_cache_free(pack->delta_cache);
606 pack->delta_cache = NULL;
612 const struct got_error *
613 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
614 struct got_pack *pack, off_t offset)
624 if (offset >= pack->filesize)
625 return got_error(GOT_ERR_PACK_OFFSET);
628 mapoff = (size_t)offset;
630 if (lseek(pack->fd, offset, SEEK_SET) == -1)
631 return got_error_from_errno("lseek");
635 /* We do not support size values which don't fit in 64 bit. */
637 return got_error(GOT_ERR_NO_SPACE);
640 sizeN = *(pack->map + mapoff);
641 mapoff += sizeof(sizeN);
643 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
645 return got_error_from_errno("read");
646 if (n != sizeof(sizeN))
647 return got_error(GOT_ERR_BAD_PACKFILE);
649 *len += sizeof(sizeN);
652 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
653 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
654 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
656 size_t shift = 4 + 7 * (i - 1);
657 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
660 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
667 static const struct got_error *
668 open_plain_object(struct got_object **obj, struct got_object_id *id,
669 uint8_t type, off_t offset, size_t size, int idx)
671 *obj = calloc(1, sizeof(**obj));
673 return got_error_from_errno("calloc");
676 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
677 (*obj)->pack_idx = idx;
680 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
681 (*obj)->pack_offset = offset;
686 static const struct got_error *
687 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
698 /* We do not support offset values which don't fit in 64 bit. */
700 return got_error(GOT_ERR_NO_SPACE);
704 if (delta_offset >= pack->filesize)
705 return got_error(GOT_ERR_PACK_OFFSET);
706 mapoff = (size_t)delta_offset + *len;
707 offN = *(pack->map + mapoff);
710 n = read(pack->fd, &offN, sizeof(offN));
712 return got_error_from_errno("read");
713 if (n != sizeof(offN))
714 return got_error(GOT_ERR_BAD_PACKFILE);
716 *len += sizeof(offN);
719 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
723 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
726 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
732 const struct got_error *
733 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
734 off_t offset, int tslen)
736 const struct got_error *err;
742 err = parse_negative_offset(&negoffset, &negofflen, pack,
747 /* Compute the base object's offset (must be in the same pack file). */
748 *base_offset = (offset - negoffset);
749 if (*base_offset <= 0)
750 return got_error(GOT_ERR_BAD_PACKFILE);
756 static const struct got_error *
757 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
758 size_t delta_data_offset, struct got_pack *pack)
760 const struct got_error *err = NULL;
763 if (delta_data_offset >= pack->filesize)
764 return got_error(GOT_ERR_PACK_OFFSET);
765 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
766 NULL, NULL, pack->map, delta_data_offset,
767 pack->filesize - delta_data_offset);
769 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
770 return got_error_from_errno("lseek");
771 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
777 static const struct got_error *
778 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
779 int delta_type, size_t delta_size, size_t delta_data_offset)
781 struct got_delta *delta;
783 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
786 return got_error_from_errno("got_delta_open");
787 /* delta is freed in got_object_close() */
789 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
793 static const struct got_error *
794 resolve_offset_delta(struct got_delta_chain *deltas,
795 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
796 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
799 const struct got_error *err;
804 off_t delta_data_offset;
807 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
808 delta_offset, tslen);
812 delta_data_offset = delta_offset + tslen + consumed;
813 if (delta_data_offset >= pack->filesize)
814 return got_error(GOT_ERR_PACK_OFFSET);
816 if (pack->map == NULL) {
817 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
818 if (delta_data_offset == -1)
819 return got_error_from_errno("lseek");
822 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
827 /* An offset delta must be in the same packfile. */
828 if (base_offset >= pack->filesize)
829 return got_error(GOT_ERR_PACK_OFFSET);
831 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
832 &base_tslen, pack, base_offset);
836 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
837 base_tslen, base_type, base_size, recursion - 1);
840 const struct got_error *
841 got_pack_parse_ref_delta(struct got_object_id *id,
842 struct got_pack *pack, off_t delta_offset, int tslen)
845 size_t mapoff = delta_offset + tslen;
846 memcpy(id, pack->map + mapoff, sizeof(*id));
849 n = read(pack->fd, id, sizeof(*id));
851 return got_error_from_errno("read");
852 if (n != sizeof(*id))
853 return got_error(GOT_ERR_BAD_PACKFILE);
859 static const struct got_error *
860 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
861 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
862 size_t delta_size, unsigned int recursion)
864 const struct got_error *err;
865 struct got_object_id id;
871 off_t delta_data_offset;
873 if (delta_offset + tslen >= pack->filesize)
874 return got_error(GOT_ERR_PACK_OFFSET);
876 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
880 delta_data_offset = delta_offset + tslen + sizeof(id);
882 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
883 if (delta_data_offset == -1)
884 return got_error_from_errno("lseek");
887 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
892 /* Delta base must be in the same pack file. */
893 idx = got_packidx_get_object_idx(packidx, &id);
895 return got_error(GOT_ERR_NO_OBJ);
897 base_offset = got_packidx_get_object_offset(packidx, idx);
898 if (base_offset == (uint64_t)-1)
899 return got_error(GOT_ERR_BAD_PACKIDX);
901 if (base_offset >= pack->filesize)
902 return got_error(GOT_ERR_PACK_OFFSET);
904 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
905 &base_tslen, pack, base_offset);
909 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
910 base_tslen, base_type, base_size, recursion - 1);
913 const struct got_error *
914 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
915 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
916 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
918 const struct got_error *err = NULL;
920 if (--recursion == 0)
921 return got_error(GOT_ERR_RECURSION);
923 switch (delta_type) {
924 case GOT_OBJ_TYPE_COMMIT:
925 case GOT_OBJ_TYPE_TREE:
926 case GOT_OBJ_TYPE_BLOB:
927 case GOT_OBJ_TYPE_TAG:
928 /* Plain types are the final delta base. Recursion ends. */
929 err = add_delta(deltas, delta_offset, tslen, delta_type,
932 case GOT_OBJ_TYPE_OFFSET_DELTA:
933 err = resolve_offset_delta(deltas, packidx, pack,
934 delta_offset, tslen, delta_type, delta_size, recursion - 1);
936 case GOT_OBJ_TYPE_REF_DELTA:
937 err = resolve_ref_delta(deltas, packidx, pack,
938 delta_offset, tslen, delta_type, delta_size, recursion - 1);
941 return got_error(GOT_ERR_OBJ_TYPE);
947 static const struct got_error *
948 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
949 struct got_pack *pack, struct got_object_id *id, off_t offset,
950 size_t tslen, int delta_type, size_t delta_size, int idx)
952 const struct got_error *err = NULL;
955 *obj = calloc(1, sizeof(**obj));
957 return got_error_from_errno("calloc");
961 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
962 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
963 (*obj)->pack_offset = offset + tslen;
965 STAILQ_INIT(&(*obj)->deltas.entries);
966 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
967 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
968 (*obj)->pack_idx = idx;
970 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
971 offset, tslen, delta_type, delta_size,
972 GOT_DELTA_CHAIN_RECURSION_MAX);
976 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
979 (*obj)->type = resolved_type;
982 got_object_close(*obj);
988 const struct got_error *
989 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
990 struct got_packidx *packidx, int idx, struct got_object_id *id)
992 const struct got_error *err = NULL;
1000 offset = got_packidx_get_object_offset(packidx, idx);
1001 if (offset == (uint64_t)-1)
1002 return got_error(GOT_ERR_BAD_PACKIDX);
1004 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1010 case GOT_OBJ_TYPE_COMMIT:
1011 case GOT_OBJ_TYPE_TREE:
1012 case GOT_OBJ_TYPE_BLOB:
1013 case GOT_OBJ_TYPE_TAG:
1014 err = open_plain_object(obj, id, type, offset + tslen,
1017 case GOT_OBJ_TYPE_OFFSET_DELTA:
1018 case GOT_OBJ_TYPE_REF_DELTA:
1019 err = open_delta_object(obj, packidx, pack, id, offset,
1020 tslen, type, size, idx);
1023 err = got_error(GOT_ERR_OBJ_TYPE);
1030 const struct got_error *
1031 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
1032 struct got_pack *pack)
1034 struct got_delta *delta;
1035 uint64_t base_size = 0, result_size = 0;
1038 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1039 /* Plain object types are the delta base. */
1040 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1041 delta->type != GOT_OBJ_TYPE_TREE &&
1042 delta->type != GOT_OBJ_TYPE_BLOB &&
1043 delta->type != GOT_OBJ_TYPE_TAG) {
1044 const struct got_error *err;
1049 got_delta_cache_get(&delta_buf, &delta_len,
1050 pack->delta_cache, delta->data_offset);
1051 if (delta_buf == NULL) {
1053 err = read_delta_data(&delta_buf, &delta_len,
1054 delta->data_offset, pack);
1057 err = got_delta_cache_add(pack->delta_cache,
1058 delta->data_offset, delta_buf, delta_len);
1061 else if (err->code != GOT_ERR_NO_SPACE) {
1066 err = got_delta_get_sizes(&base_size, &result_size,
1067 delta_buf, delta_len);
1073 base_size = delta->size;
1074 if (base_size > *max_size)
1075 *max_size = base_size;
1076 if (result_size > *max_size)
1077 *max_size = result_size;
1083 const struct got_error *
1084 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1085 struct got_pack *pack)
1087 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1088 return got_error(GOT_ERR_OBJ_TYPE);
1090 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1093 const struct got_error *
1094 got_pack_dump_delta_chain_to_file(size_t *result_size,
1095 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1096 FILE *base_file, FILE *accum_file)
1098 const struct got_error *err = NULL;
1099 struct got_delta *delta;
1100 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1101 size_t base_bufsz = 0, accum_size = 0, delta_len;
1107 if (STAILQ_EMPTY(&deltas->entries))
1108 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1110 /* We process small enough files entirely in memory for speed. */
1111 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1114 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1115 accum_buf = malloc(max_size);
1116 if (accum_buf == NULL)
1117 return got_error_from_errno("malloc");
1122 /* Deltas are ordered in ascending order. */
1123 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1127 off_t delta_data_offset;
1129 /* Plain object types are the delta base. */
1130 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1131 delta->type != GOT_OBJ_TYPE_TREE &&
1132 delta->type != GOT_OBJ_TYPE_BLOB &&
1133 delta->type != GOT_OBJ_TYPE_TAG) {
1134 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1138 delta_data_offset = delta->offset + delta->tslen;
1139 if (delta_data_offset >= pack->filesize) {
1140 err = got_error(GOT_ERR_PACK_OFFSET);
1143 if (pack->map == NULL) {
1144 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1146 err = got_error_from_errno("lseek");
1152 mapoff = (size_t)delta_data_offset;
1153 err = got_inflate_to_file_mmap(
1154 &base_bufsz, NULL, NULL, pack->map,
1155 mapoff, pack->filesize - mapoff,
1158 err = got_inflate_to_file_fd(
1159 &base_bufsz, NULL, NULL, pack->fd,
1163 mapoff = (size_t)delta_data_offset;
1164 err = got_inflate_to_mem_mmap(&base_buf,
1165 &base_bufsz, NULL, NULL,
1167 pack->filesize - mapoff);
1169 err = got_inflate_to_mem_fd(&base_buf,
1170 &base_bufsz, NULL, NULL, max_size,
1181 got_delta_cache_get(&delta_buf, &delta_len,
1182 pack->delta_cache, delta->data_offset);
1183 if (delta_buf == NULL) {
1185 err = read_delta_data(&delta_buf, &delta_len,
1186 delta->data_offset, pack);
1189 err = got_delta_cache_add(pack->delta_cache,
1190 delta->data_offset, delta_buf, delta_len);
1193 else if (err->code != GOT_ERR_NO_SPACE) {
1199 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1200 delta_buf, delta_len, accum_buf,
1201 &accum_size, max_size);
1204 err = got_delta_apply(base_file, delta_buf,
1206 /* Final delta application writes to output file. */
1207 ++n < deltas->nentries ? accum_file : outfile,
1215 if (n < deltas->nentries) {
1216 /* Accumulated delta becomes the new base. */
1218 uint8_t *tmp = accum_buf;
1220 * Base buffer switches roles with accumulation
1221 * buffer. Ensure it can hold the largest
1222 * result in the delta chain. The initial
1223 * allocation might have been smaller.
1225 if (base_bufsz < max_size) {
1227 p = reallocarray(base_buf, 1, max_size);
1229 err = got_error_from_errno(
1234 base_bufsz = max_size;
1236 accum_buf = base_buf;
1239 FILE *tmp = accum_file;
1240 accum_file = base_file;
1251 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1253 if (len != accum_size)
1254 err = got_ferror(outfile, GOT_ERR_IO);
1258 *result_size = accum_size;
1262 const struct got_error *
1263 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1264 struct got_delta_chain *deltas, struct got_pack *pack)
1266 const struct got_error *err = NULL;
1267 struct got_delta *delta;
1268 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1269 size_t base_bufsz = 0, accum_size = 0, delta_len;
1276 if (STAILQ_EMPTY(&deltas->entries))
1277 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1279 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1282 accum_buf = malloc(max_size);
1283 if (accum_buf == NULL)
1284 return got_error_from_errno("malloc");
1286 /* Deltas are ordered in ascending order. */
1287 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1290 size_t delta_data_offset;
1292 /* Plain object types are the delta base. */
1293 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1294 delta->type != GOT_OBJ_TYPE_TREE &&
1295 delta->type != GOT_OBJ_TYPE_BLOB &&
1296 delta->type != GOT_OBJ_TYPE_TAG) {
1297 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1301 delta_data_offset = delta->offset + delta->tslen;
1302 if (delta_data_offset >= pack->filesize) {
1303 err = got_error(GOT_ERR_PACK_OFFSET);
1307 size_t mapoff = (size_t)delta_data_offset;
1308 err = got_inflate_to_mem_mmap(&base_buf,
1309 &base_bufsz, NULL, NULL, pack->map,
1310 mapoff, pack->filesize - mapoff);
1312 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1314 err = got_error_from_errno("lseek");
1317 err = got_inflate_to_mem_fd(&base_buf,
1318 &base_bufsz, NULL, NULL, max_size,
1327 got_delta_cache_get(&delta_buf, &delta_len,
1328 pack->delta_cache, delta->data_offset);
1329 if (delta_buf == NULL) {
1331 err = read_delta_data(&delta_buf, &delta_len,
1332 delta->data_offset, pack);
1335 err = got_delta_cache_add(pack->delta_cache,
1336 delta->data_offset, delta_buf, delta_len);
1339 else if (err->code != GOT_ERR_NO_SPACE) {
1344 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1345 delta_buf, delta_len, accum_buf,
1346 &accum_size, max_size);
1353 if (n < deltas->nentries) {
1354 /* Accumulated delta becomes the new base. */
1355 uint8_t *tmp = accum_buf;
1357 * Base buffer switches roles with accumulation buffer.
1358 * Ensure it can hold the largest result in the delta
1359 * chain. Initial allocation might have been smaller.
1361 if (base_bufsz < max_size) {
1363 p = reallocarray(base_buf, 1, max_size);
1365 err = got_error_from_errno(
1370 base_bufsz = max_size;
1372 accum_buf = base_buf;
1384 *outbuf = accum_buf;
1385 *outlen = accum_size;
1390 const struct got_error *
1391 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1392 FILE *outfile, FILE *base_file, FILE *accum_file)
1394 const struct got_error *err = NULL;
1396 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1397 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1399 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1400 if (obj->pack_offset >= pack->filesize)
1401 return got_error(GOT_ERR_PACK_OFFSET);
1404 size_t mapoff = (size_t)obj->pack_offset;
1405 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1406 pack->map, mapoff, pack->filesize - mapoff,
1409 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1410 return got_error_from_errno("lseek");
1411 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1415 err = got_pack_dump_delta_chain_to_file(&obj->size,
1416 &obj->deltas, pack, outfile, base_file, accum_file);
1421 const struct got_error *
1422 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1423 struct got_object *obj, struct got_pack *pack)
1425 const struct got_error *err = NULL;
1427 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1428 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1430 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1431 if (obj->pack_offset >= pack->filesize)
1432 return got_error(GOT_ERR_PACK_OFFSET);
1434 size_t mapoff = (size_t)obj->pack_offset;
1435 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1436 pack->map, mapoff, pack->filesize - mapoff);
1438 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1439 return got_error_from_errno("lseek");
1440 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1441 obj->size, pack->fd);
1444 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,