2 * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <sys/types.h>
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_opentemp.h"
37 #include "got_lib_sha1.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_delta_cache.h"
40 #include "got_lib_inflate.h"
41 #include "got_lib_object.h"
42 #include "got_lib_object_parse.h"
43 #include "got_lib_privsep.h"
44 #include "got_lib_pack.h"
47 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
51 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
54 static const struct got_error *
55 verify_fanout_table(uint32_t *fanout_table)
59 for (i = 0; i < 0xff - 1; i++) {
60 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
61 return got_error(GOT_ERR_BAD_PACKIDX);
67 const struct got_error *
68 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
70 const struct got_error *err = NULL;
71 struct got_packidx_v2_hdr *h;
73 uint8_t sha1[SHA1_DIGEST_LENGTH];
74 size_t nobj, len_fanout, len_ids, offset, remain;
84 if (remain < sizeof(*h->magic)) {
85 err = got_error(GOT_ERR_BAD_PACKIDX);
89 h->magic = (uint32_t *)(p->map + offset);
91 h->magic = malloc(sizeof(*h->magic));
92 if (h->magic == NULL) {
93 err = got_error_from_errno("malloc");
96 n = read(p->fd, h->magic, sizeof(*h->magic));
98 err = got_error_from_errno("read");
100 } else if (n != sizeof(*h->magic)) {
101 err = got_error(GOT_ERR_BAD_PACKIDX);
105 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
109 offset += sizeof(*h->magic);
110 remain -= sizeof(*h->magic);
113 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
115 if (remain < sizeof(*h->version)) {
116 err = got_error(GOT_ERR_BAD_PACKIDX);
120 h->version = (uint32_t *)(p->map + offset);
122 h->version = malloc(sizeof(*h->version));
123 if (h->version == NULL) {
124 err = got_error_from_errno("malloc");
127 n = read(p->fd, h->version, sizeof(*h->version));
129 err = got_error_from_errno("read");
131 } else if (n != sizeof(*h->version)) {
132 err = got_error(GOT_ERR_BAD_PACKIDX);
136 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
140 offset += sizeof(*h->version);
141 remain -= sizeof(*h->version);
144 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
147 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
148 if (remain < len_fanout) {
149 err = got_error(GOT_ERR_BAD_PACKIDX);
153 h->fanout_table = (uint32_t *)(p->map + offset);
155 h->fanout_table = malloc(len_fanout);
156 if (h->fanout_table == NULL) {
157 err = got_error_from_errno("malloc");
160 n = read(p->fd, h->fanout_table, len_fanout);
162 err = got_error_from_errno("read");
164 } else if (n != len_fanout) {
165 err = got_error(GOT_ERR_BAD_PACKIDX);
169 err = verify_fanout_table(h->fanout_table);
173 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
174 offset += len_fanout;
175 remain -= len_fanout;
177 nobj = be32toh(h->fanout_table[0xff]);
178 len_ids = nobj * sizeof(*h->sorted_ids);
179 if (len_ids <= nobj || len_ids > remain) {
180 err = got_error(GOT_ERR_BAD_PACKIDX);
185 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
187 h->sorted_ids = malloc(len_ids);
188 if (h->sorted_ids == NULL) {
189 err = got_error(GOT_ERR_BAD_PACKIDX);
192 n = read(p->fd, h->sorted_ids, len_ids);
194 err = got_error_from_errno("read");
195 else if (n != len_ids) {
196 err = got_error(GOT_ERR_BAD_PACKIDX);
201 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
205 if (remain < nobj * sizeof(*h->crc32)) {
206 err = got_error(GOT_ERR_BAD_PACKIDX);
210 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
212 h->crc32 = malloc(nobj * sizeof(*h->crc32));
213 if (h->crc32 == NULL) {
214 err = got_error_from_errno("malloc");
217 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
219 err = got_error_from_errno("read");
220 else if (n != nobj * sizeof(*h->crc32)) {
221 err = got_error(GOT_ERR_BAD_PACKIDX);
226 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
227 remain -= nobj * sizeof(*h->crc32);
228 offset += nobj * sizeof(*h->crc32);
230 if (remain < nobj * sizeof(*h->offsets)) {
231 err = got_error(GOT_ERR_BAD_PACKIDX);
235 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
237 h->offsets = malloc(nobj * sizeof(*h->offsets));
238 if (h->offsets == NULL) {
239 err = got_error_from_errno("malloc");
242 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
244 err = got_error_from_errno("read");
245 else if (n != nobj * sizeof(*h->offsets)) {
246 err = got_error(GOT_ERR_BAD_PACKIDX);
251 SHA1Update(&ctx, (uint8_t *)h->offsets,
252 nobj * sizeof(*h->offsets));
253 remain -= nobj * sizeof(*h->offsets);
254 offset += nobj * sizeof(*h->offsets);
256 /* Large file offsets are contained only in files > 2GB. */
257 if (verify || packfile_size > 0x7fffffff) {
258 for (i = 0; i < nobj; i++) {
259 uint32_t o = h->offsets[i];
260 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
264 if (p->nlargeobj == 0)
266 else if (packfile_size <= 0x7fffffff) {
267 err = got_error(GOT_ERR_BAD_PACKIDX);
271 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
272 err = got_error(GOT_ERR_BAD_PACKIDX);
276 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
278 h->large_offsets = malloc(p->nlargeobj *
279 sizeof(*h->large_offsets));
280 if (h->large_offsets == NULL) {
281 err = got_error_from_errno("malloc");
284 n = read(p->fd, h->large_offsets,
285 p->nlargeobj * sizeof(*h->large_offsets));
287 err = got_error_from_errno("read");
288 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
289 err = got_error(GOT_ERR_BAD_PACKIDX);
294 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
295 p->nlargeobj * sizeof(*h->large_offsets));
296 remain -= p->nlargeobj * sizeof(*h->large_offsets);
297 offset += p->nlargeobj * sizeof(*h->large_offsets);
300 if (remain < sizeof(*h->trailer)) {
301 err = got_error(GOT_ERR_BAD_PACKIDX);
306 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
308 h->trailer = malloc(sizeof(*h->trailer));
309 if (h->trailer == NULL) {
310 err = got_error_from_errno("malloc");
313 n = read(p->fd, h->trailer, sizeof(*h->trailer));
315 err = got_error_from_errno("read");
316 else if (n != sizeof(*h->trailer)) {
317 err = got_error(GOT_ERR_BAD_PACKIDX);
322 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
323 SHA1Final(sha1, &ctx);
324 if (memcmp(h->trailer->packidx_sha1, sha1,
325 SHA1_DIGEST_LENGTH) != 0)
326 err = got_error(GOT_ERR_PACKIDX_CSUM);
332 const struct got_error *
333 got_packidx_open(struct got_packidx **packidx,
334 int dir_fd, const char *relpath, int verify)
336 const struct got_error *err = NULL;
337 struct got_packidx *p = NULL;
339 struct stat idx_sb, pack_sb;
343 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
348 * Ensure that a corresponding pack file exists.
349 * Some Git repositories have this problem. Git seems to ignore
350 * the existence of lonely pack index files but we do not.
352 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
353 if (errno == ENOENT) {
354 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
357 err = got_error_from_errno2("fstatat", pack_relpath);
361 p = calloc(1, sizeof(*p));
363 err = got_error_from_errno("calloc");
367 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
369 err = got_error_from_errno2("openat", relpath);
374 if (fstat(p->fd, &idx_sb) != 0) {
375 err = got_error_from_errno2("fstat", relpath);
380 p->len = idx_sb.st_size;
381 if (p->len < sizeof(p->hdr)) {
382 err = got_error(GOT_ERR_BAD_PACKIDX);
388 p->path_packidx = strdup(relpath);
389 if (p->path_packidx == NULL) {
390 err = got_error_from_errno("strdup");
394 #ifndef GOT_PACK_NO_MMAP
395 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
396 if (p->map == MAP_FAILED) {
397 if (errno != ENOMEM) {
398 err = got_error_from_errno("mmap");
401 p->map = NULL; /* fall back to read(2) */
405 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
409 got_packidx_close(p);
416 const struct got_error *
417 got_packidx_close(struct got_packidx *packidx)
419 const struct got_error *err = NULL;
421 free(packidx->path_packidx);
423 if (munmap(packidx->map, packidx->len) == -1)
424 err = got_error_from_errno("munmap");
426 free(packidx->hdr.magic);
427 free(packidx->hdr.version);
428 free(packidx->hdr.fanout_table);
429 free(packidx->hdr.sorted_ids);
430 free(packidx->hdr.crc32);
431 free(packidx->hdr.offsets);
432 free(packidx->hdr.large_offsets);
433 free(packidx->hdr.trailer);
435 if (close(packidx->fd) == -1 && err == NULL)
436 err = got_error_from_errno("close");
442 const struct got_error *
443 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
447 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
448 size = strlen(path_packidx) + 2;
449 if (size < GOT_PACKFILE_NAMELEN + 1)
450 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
452 *path_packfile = malloc(size);
453 if (*path_packfile == NULL)
454 return got_error_from_errno("malloc");
456 /* Copy up to and excluding ".idx". */
457 if (strlcpy(*path_packfile, path_packidx,
458 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
459 return got_error(GOT_ERR_NO_SPACE);
461 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
462 return got_error(GOT_ERR_NO_SPACE);
468 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
470 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
471 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
473 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
474 if (idx < 0 || idx >= packidx->nlargeobj ||
475 packidx->hdr.large_offsets == NULL)
477 loffset = be64toh(packidx->hdr.large_offsets[idx]);
478 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
480 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
484 got_packidx_get_object_idx(struct got_packidx *packidx,
485 struct got_object_id *id)
487 u_int8_t id0 = id->sha1[0];
488 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
489 int left = 0, right = totobj - 1;
492 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
494 while (left <= right) {
495 struct got_packidx_object_id *oid;
498 i = ((left + right) / 2);
499 oid = &packidx->hdr.sorted_ids[i];
500 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
512 const struct got_error *
513 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
514 struct got_packidx *packidx, const char *id_str_prefix)
516 const struct got_error *err = NULL;
518 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
520 size_t prefix_len = strlen(id_str_prefix);
521 struct got_packidx_object_id *oid;
524 STAILQ_INIT(matched_ids);
527 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
529 hex[0] = id_str_prefix[0];
530 hex[1] = id_str_prefix[1];
532 if (!got_parse_xdigit(&id0, hex))
533 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 if (mapoff + sizeof(sizeN) >= pack->filesize)
639 return got_error(GOT_ERR_BAD_PACKFILE);
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 mapoff = (size_t)delta_offset + *len;
705 if (mapoff + sizeof(offN) >= pack->filesize)
706 return got_error(GOT_ERR_PACK_OFFSET);
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,
734 struct got_pack *pack, 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 if (mapoff + sizeof(*id) >= pack->filesize)
847 return got_error(GOT_ERR_PACK_OFFSET);
848 memcpy(id, pack->map + mapoff, sizeof(*id));
851 n = read(pack->fd, id, sizeof(*id));
853 return got_error_from_errno("read");
854 if (n != sizeof(*id))
855 return got_error(GOT_ERR_BAD_PACKFILE);
861 static const struct got_error *
862 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
863 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
864 size_t delta_size, unsigned int recursion)
866 const struct got_error *err;
867 struct got_object_id id;
873 off_t delta_data_offset;
875 if (delta_offset + tslen >= pack->filesize)
876 return got_error(GOT_ERR_PACK_OFFSET);
878 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
882 delta_data_offset = delta_offset + tslen + sizeof(id);
884 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
885 if (delta_data_offset == -1)
886 return got_error_from_errno("lseek");
889 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
894 /* Delta base must be in the same pack file. */
895 idx = got_packidx_get_object_idx(packidx, &id);
897 return got_error(GOT_ERR_NO_OBJ);
899 base_offset = got_packidx_get_object_offset(packidx, idx);
900 if (base_offset == (uint64_t)-1)
901 return got_error(GOT_ERR_BAD_PACKIDX);
903 if (base_offset >= pack->filesize)
904 return got_error(GOT_ERR_PACK_OFFSET);
906 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
907 &base_tslen, pack, base_offset);
911 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
912 base_tslen, base_type, base_size, recursion - 1);
915 const struct got_error *
916 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
917 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
918 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
920 const struct got_error *err = NULL;
922 if (--recursion == 0)
923 return got_error(GOT_ERR_RECURSION);
925 switch (delta_type) {
926 case GOT_OBJ_TYPE_COMMIT:
927 case GOT_OBJ_TYPE_TREE:
928 case GOT_OBJ_TYPE_BLOB:
929 case GOT_OBJ_TYPE_TAG:
930 /* Plain types are the final delta base. Recursion ends. */
931 err = add_delta(deltas, delta_offset, tslen, delta_type,
934 case GOT_OBJ_TYPE_OFFSET_DELTA:
935 err = resolve_offset_delta(deltas, packidx, pack,
936 delta_offset, tslen, delta_type, delta_size, recursion - 1);
938 case GOT_OBJ_TYPE_REF_DELTA:
939 err = resolve_ref_delta(deltas, packidx, pack,
940 delta_offset, tslen, delta_type, delta_size, recursion - 1);
943 return got_error(GOT_ERR_OBJ_TYPE);
949 static const struct got_error *
950 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
951 struct got_pack *pack, struct got_object_id *id, off_t offset,
952 size_t tslen, int delta_type, size_t delta_size, int idx)
954 const struct got_error *err = NULL;
957 *obj = calloc(1, sizeof(**obj));
959 return got_error_from_errno("calloc");
963 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
964 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
965 (*obj)->pack_offset = offset + tslen;
967 STAILQ_INIT(&(*obj)->deltas.entries);
968 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
969 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
970 (*obj)->pack_idx = idx;
972 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
973 offset, tslen, delta_type, delta_size,
974 GOT_DELTA_CHAIN_RECURSION_MAX);
978 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
981 (*obj)->type = resolved_type;
984 got_object_close(*obj);
990 const struct got_error *
991 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
992 struct got_packidx *packidx, int idx, struct got_object_id *id)
994 const struct got_error *err = NULL;
1002 offset = got_packidx_get_object_offset(packidx, idx);
1003 if (offset == (uint64_t)-1)
1004 return got_error(GOT_ERR_BAD_PACKIDX);
1006 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1012 case GOT_OBJ_TYPE_COMMIT:
1013 case GOT_OBJ_TYPE_TREE:
1014 case GOT_OBJ_TYPE_BLOB:
1015 case GOT_OBJ_TYPE_TAG:
1016 err = open_plain_object(obj, id, type, offset + tslen,
1019 case GOT_OBJ_TYPE_OFFSET_DELTA:
1020 case GOT_OBJ_TYPE_REF_DELTA:
1021 err = open_delta_object(obj, packidx, pack, id, offset,
1022 tslen, type, size, idx);
1025 err = got_error(GOT_ERR_OBJ_TYPE);
1032 const struct got_error *
1033 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1034 struct got_delta_chain *deltas, struct got_pack *pack)
1036 struct got_delta *delta;
1037 uint64_t base_size = 0, result_size = 0;
1040 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1041 /* Plain object types are the delta base. */
1042 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1043 delta->type != GOT_OBJ_TYPE_TREE &&
1044 delta->type != GOT_OBJ_TYPE_BLOB &&
1045 delta->type != GOT_OBJ_TYPE_TAG) {
1046 const struct got_error *err;
1051 got_delta_cache_get(&delta_buf, &delta_len,
1052 pack->delta_cache, delta->data_offset);
1053 if (delta_buf == NULL) {
1055 err = read_delta_data(&delta_buf, &delta_len,
1056 delta->data_offset, pack);
1059 err = got_delta_cache_add(pack->delta_cache,
1060 delta->data_offset, delta_buf, delta_len);
1063 else if (err->code != GOT_ERR_NO_SPACE) {
1068 err = got_delta_get_sizes(&base_size, &result_size,
1069 delta_buf, delta_len);
1075 base_size = delta->size;
1076 if (base_size > *max_size)
1077 *max_size = base_size;
1078 if (result_size > *max_size)
1079 *max_size = result_size;
1085 const struct got_error *
1086 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1087 struct got_pack *pack)
1089 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1090 return got_error(GOT_ERR_OBJ_TYPE);
1092 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1095 const struct got_error *
1096 got_pack_dump_delta_chain_to_file(size_t *result_size,
1097 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1098 FILE *base_file, FILE *accum_file)
1100 const struct got_error *err = NULL;
1101 struct got_delta *delta;
1102 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1103 size_t base_bufsz = 0, accum_size = 0, delta_len;
1109 if (STAILQ_EMPTY(&deltas->entries))
1110 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1112 /* We process small enough files entirely in memory for speed. */
1113 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1116 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1117 accum_buf = malloc(max_size);
1118 if (accum_buf == NULL)
1119 return got_error_from_errno("malloc");
1123 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1124 return got_error_from_errno("fseeko");
1125 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1126 return got_error_from_errno("fseeko");
1129 /* Deltas are ordered in ascending order. */
1130 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1134 off_t delta_data_offset;
1136 /* Plain object types are the delta base. */
1137 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1138 delta->type != GOT_OBJ_TYPE_TREE &&
1139 delta->type != GOT_OBJ_TYPE_BLOB &&
1140 delta->type != GOT_OBJ_TYPE_TAG) {
1141 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1145 delta_data_offset = delta->offset + delta->tslen;
1146 if (delta_data_offset >= pack->filesize) {
1147 err = got_error(GOT_ERR_PACK_OFFSET);
1150 if (pack->map == NULL) {
1151 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1153 err = got_error_from_errno("lseek");
1159 mapoff = (size_t)delta_data_offset;
1160 err = got_inflate_to_file_mmap(
1161 &base_bufsz, NULL, NULL, pack->map,
1162 mapoff, pack->filesize - mapoff,
1165 err = got_inflate_to_file_fd(
1166 &base_bufsz, NULL, NULL, pack->fd,
1170 mapoff = (size_t)delta_data_offset;
1171 err = got_inflate_to_mem_mmap(&base_buf,
1172 &base_bufsz, NULL, NULL,
1174 pack->filesize - mapoff);
1176 err = got_inflate_to_mem_fd(&base_buf,
1177 &base_bufsz, NULL, NULL, max_size,
1188 got_delta_cache_get(&delta_buf, &delta_len,
1189 pack->delta_cache, delta->data_offset);
1190 if (delta_buf == NULL) {
1192 err = read_delta_data(&delta_buf, &delta_len,
1193 delta->data_offset, pack);
1196 err = got_delta_cache_add(pack->delta_cache,
1197 delta->data_offset, delta_buf, delta_len);
1200 else if (err->code != GOT_ERR_NO_SPACE) {
1206 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1207 delta_buf, delta_len, accum_buf,
1208 &accum_size, max_size);
1211 err = got_delta_apply(base_file, delta_buf,
1213 /* Final delta application writes to output file. */
1214 ++n < deltas->nentries ? accum_file : outfile,
1222 if (n < deltas->nentries) {
1223 /* Accumulated delta becomes the new base. */
1225 uint8_t *tmp = accum_buf;
1227 * Base buffer switches roles with accumulation
1228 * buffer. Ensure it can hold the largest
1229 * result in the delta chain. The initial
1230 * allocation might have been smaller.
1232 if (base_bufsz < max_size) {
1234 p = reallocarray(base_buf, 1, max_size);
1236 err = got_error_from_errno(
1241 base_bufsz = max_size;
1243 accum_buf = base_buf;
1246 FILE *tmp = accum_file;
1247 accum_file = base_file;
1258 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1260 if (len != accum_size)
1261 err = got_ferror(outfile, GOT_ERR_IO);
1265 *result_size = accum_size;
1269 const struct got_error *
1270 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1271 struct got_delta_chain *deltas, struct got_pack *pack)
1273 const struct got_error *err = NULL;
1274 struct got_delta *delta;
1275 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1276 size_t base_bufsz = 0, accum_size = 0, delta_len;
1283 if (STAILQ_EMPTY(&deltas->entries))
1284 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1286 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1289 accum_buf = malloc(max_size);
1290 if (accum_buf == NULL)
1291 return got_error_from_errno("malloc");
1293 /* Deltas are ordered in ascending order. */
1294 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1297 size_t delta_data_offset;
1299 /* Plain object types are the delta base. */
1300 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1301 delta->type != GOT_OBJ_TYPE_TREE &&
1302 delta->type != GOT_OBJ_TYPE_BLOB &&
1303 delta->type != GOT_OBJ_TYPE_TAG) {
1304 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1308 delta_data_offset = delta->offset + delta->tslen;
1309 if (delta_data_offset >= pack->filesize) {
1310 err = got_error(GOT_ERR_PACK_OFFSET);
1314 size_t mapoff = (size_t)delta_data_offset;
1315 err = got_inflate_to_mem_mmap(&base_buf,
1316 &base_bufsz, NULL, NULL, pack->map,
1317 mapoff, pack->filesize - mapoff);
1319 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1321 err = got_error_from_errno("lseek");
1324 err = got_inflate_to_mem_fd(&base_buf,
1325 &base_bufsz, NULL, NULL, max_size,
1334 got_delta_cache_get(&delta_buf, &delta_len,
1335 pack->delta_cache, delta->data_offset);
1336 if (delta_buf == NULL) {
1338 err = read_delta_data(&delta_buf, &delta_len,
1339 delta->data_offset, pack);
1342 err = got_delta_cache_add(pack->delta_cache,
1343 delta->data_offset, delta_buf, delta_len);
1346 else if (err->code != GOT_ERR_NO_SPACE) {
1351 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1352 delta_buf, delta_len, accum_buf,
1353 &accum_size, max_size);
1360 if (n < deltas->nentries) {
1361 /* Accumulated delta becomes the new base. */
1362 uint8_t *tmp = accum_buf;
1364 * Base buffer switches roles with accumulation buffer.
1365 * Ensure it can hold the largest result in the delta
1366 * chain. Initial allocation might have been smaller.
1368 if (base_bufsz < max_size) {
1370 p = reallocarray(base_buf, 1, max_size);
1372 err = got_error_from_errno(
1377 base_bufsz = max_size;
1379 accum_buf = base_buf;
1391 *outbuf = accum_buf;
1392 *outlen = accum_size;
1397 const struct got_error *
1398 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1399 FILE *outfile, FILE *base_file, FILE *accum_file)
1401 const struct got_error *err = NULL;
1403 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1404 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1406 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1407 if (obj->pack_offset >= pack->filesize)
1408 return got_error(GOT_ERR_PACK_OFFSET);
1411 size_t mapoff = (size_t)obj->pack_offset;
1412 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1413 pack->map, mapoff, pack->filesize - mapoff,
1416 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1417 return got_error_from_errno("lseek");
1418 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1422 err = got_pack_dump_delta_chain_to_file(&obj->size,
1423 &obj->deltas, pack, outfile, base_file, accum_file);
1428 const struct got_error *
1429 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1430 struct got_object *obj, struct got_pack *pack)
1432 const struct got_error *err = NULL;
1434 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1435 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1437 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1438 if (obj->pack_offset >= pack->filesize)
1439 return got_error(GOT_ERR_PACK_OFFSET);
1441 size_t mapoff = (size_t)obj->pack_offset;
1442 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1443 pack->map, mapoff, pack->filesize - mapoff);
1445 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1446 return got_error_from_errno("lseek");
1447 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1448 obj->size, pack->fd);
1451 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,