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)
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 (be32toh(*h->magic) != 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 (be32toh(*h->version) != 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 for (i = 0; i < nobj; i++) {
262 uint32_t o = be32toh(h->offsets[i]);
263 if (o & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX)
266 if (p->nlargeobj == 0)
269 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
274 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
276 h->large_offsets = malloc(p->nlargeobj *
277 sizeof(*h->large_offsets));
278 if (h->large_offsets == NULL) {
279 err = got_error_from_errno("malloc");
282 n = read(p->fd, h->large_offsets,
283 p->nlargeobj * sizeof(*h->large_offsets));
285 err = got_error_from_errno("read");
286 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
287 err = got_error(GOT_ERR_BAD_PACKIDX);
292 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
293 p->nlargeobj * sizeof(*h->large_offsets));
294 remain -= p->nlargeobj * sizeof(*h->large_offsets);
295 offset += p->nlargeobj * sizeof(*h->large_offsets);
298 if (remain < sizeof(*h->trailer)) {
299 err = got_error(GOT_ERR_BAD_PACKIDX);
304 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
306 h->trailer = malloc(sizeof(*h->trailer));
307 if (h->trailer == NULL) {
308 err = got_error_from_errno("malloc");
311 n = read(p->fd, h->trailer, sizeof(*h->trailer));
313 err = got_error_from_errno("read");
314 else if (n != sizeof(*h->trailer)) {
315 err = got_error(GOT_ERR_BAD_PACKIDX);
320 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
321 SHA1Final(sha1, &ctx);
322 if (memcmp(h->trailer->packidx_sha1, sha1,
323 SHA1_DIGEST_LENGTH) != 0)
324 err = got_error(GOT_ERR_PACKIDX_CSUM);
330 const struct got_error *
331 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
333 const struct got_error *err = NULL;
334 struct got_packidx *p;
339 p = calloc(1, sizeof(*p));
341 return got_error_from_errno("calloc");
343 p->fd = open(path, O_RDONLY | O_NOFOLLOW);
345 err = got_error_from_errno2("open", path);
350 if (fstat(p->fd, &sb) != 0) {
351 err = got_error_from_errno2("fstat", path);
357 if (p->len < sizeof(p->hdr)) {
358 err = got_error(GOT_ERR_BAD_PACKIDX);
364 p->path_packidx = strdup(path);
365 if (p->path_packidx == NULL) {
366 err = got_error_from_errno("strdup");
370 #ifndef GOT_PACK_NO_MMAP
371 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
372 if (p->map == MAP_FAILED) {
373 if (errno != ENOMEM) {
374 err = got_error_from_errno("mmap");
377 p->map = NULL; /* fall back to read(2) */
381 err = got_packidx_init_hdr(p, verify);
384 got_packidx_close(p);
391 const struct got_error *
392 got_packidx_close(struct got_packidx *packidx)
394 const struct got_error *err = NULL;
396 free(packidx->path_packidx);
398 if (munmap(packidx->map, packidx->len) == -1)
399 err = got_error_from_errno("munmap");
401 free(packidx->hdr.magic);
402 free(packidx->hdr.version);
403 free(packidx->hdr.fanout_table);
404 free(packidx->hdr.sorted_ids);
405 free(packidx->hdr.crc32);
406 free(packidx->hdr.offsets);
407 free(packidx->hdr.large_offsets);
408 free(packidx->hdr.trailer);
410 if (close(packidx->fd) != 0 && err == NULL)
411 err = got_error_from_errno("close");
418 get_object_offset(struct got_packidx *packidx, int idx)
420 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
421 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
423 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
424 if (idx < 0 || idx >= packidx->nlargeobj ||
425 packidx->hdr.large_offsets == NULL)
427 loffset = be64toh(packidx->hdr.large_offsets[idx]);
428 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
430 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
434 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
436 u_int8_t id0 = id->sha1[0];
437 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
438 int left = 0, right = totobj - 1;
441 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
443 while (left <= right) {
444 struct got_packidx_object_id *oid;
447 i = ((left + right) / 2);
448 oid = &packidx->hdr.sorted_ids[i];
449 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
461 const struct got_error *
462 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
463 struct got_packidx *packidx, const char *id_str_prefix)
465 const struct got_error *err = NULL;
467 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
469 size_t prefix_len = strlen(id_str_prefix);
470 struct got_packidx_object_id *oid;
473 SIMPLEQ_INIT(matched_ids);
476 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
478 hex[0] = id_str_prefix[0];
479 hex[1] = id_str_prefix[1];
481 if (!got_parse_xdigit(&id0, hex))
482 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
484 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
488 oid = &packidx->hdr.sorted_ids[i];
489 while (i < totobj && oid->sha1[0] == id0) {
490 char id_str[SHA1_DIGEST_STRING_LENGTH];
491 struct got_object_qid *qid;
494 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
495 return got_error(GOT_ERR_NO_SPACE);
497 cmp = strncmp(id_str, id_str_prefix, prefix_len);
499 oid = &packidx->hdr.sorted_ids[++i];
504 err = got_object_qid_alloc_partial(&qid);
507 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
508 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
510 oid = &packidx->hdr.sorted_ids[++i];
514 got_object_id_queue_free(matched_ids);
518 const struct got_error *
519 got_pack_stop_privsep_child(struct got_pack *pack)
521 const struct got_error *err = NULL;
523 if (pack->privsep_child == NULL)
526 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
529 err = got_privsep_wait_for_child(pack->privsep_child->pid);
530 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
531 err = got_error_from_errno("close");
532 free(pack->privsep_child);
533 pack->privsep_child = NULL;
537 const struct got_error *
538 got_pack_close(struct got_pack *pack)
540 const struct got_error *err = NULL;
542 err = got_pack_stop_privsep_child(pack);
543 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
544 err = got_error_from_errno("munmap");
545 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
546 err = got_error_from_errno("close");
548 free(pack->path_packfile);
549 pack->path_packfile = NULL;
551 if (pack->delta_cache) {
552 got_delta_cache_free(pack->delta_cache);
553 pack->delta_cache = NULL;
559 const struct got_error *
560 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
561 struct got_pack *pack, off_t offset)
571 if (offset >= pack->filesize)
572 return got_error(GOT_ERR_PACK_OFFSET);
575 mapoff = (size_t)offset;
577 if (lseek(pack->fd, offset, SEEK_SET) == -1)
578 return got_error_from_errno("lseek");
582 /* We do not support size values which don't fit in 64 bit. */
584 return got_error(GOT_ERR_NO_SPACE);
587 sizeN = *(pack->map + mapoff);
588 mapoff += sizeof(sizeN);
590 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
592 return got_error_from_errno("read");
593 if (n != sizeof(sizeN))
594 return got_error(GOT_ERR_BAD_PACKFILE);
596 *len += sizeof(sizeN);
599 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
600 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
601 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
603 size_t shift = 4 + 7 * (i - 1);
604 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
607 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
614 static const struct got_error *
615 open_plain_object(struct got_object **obj, struct got_object_id *id,
616 uint8_t type, off_t offset, size_t size, int idx)
618 *obj = calloc(1, sizeof(**obj));
620 return got_error_from_errno("calloc");
623 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
624 (*obj)->pack_idx = idx;
627 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
628 (*obj)->pack_offset = offset;
633 static const struct got_error *
634 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
645 /* We do not support offset values which don't fit in 64 bit. */
647 return got_error(GOT_ERR_NO_SPACE);
651 if (delta_offset >= pack->filesize)
652 return got_error(GOT_ERR_PACK_OFFSET);
653 mapoff = (size_t)delta_offset + *len;
654 offN = *(pack->map + mapoff);
657 n = read(pack->fd, &offN, sizeof(offN));
659 return got_error_from_errno("read");
660 if (n != sizeof(offN))
661 return got_error(GOT_ERR_BAD_PACKFILE);
663 *len += sizeof(offN);
666 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
670 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
673 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
679 const struct got_error *
680 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
681 off_t offset, int tslen)
683 const struct got_error *err;
689 err = parse_negative_offset(&negoffset, &negofflen, pack,
694 /* Compute the base object's offset (must be in the same pack file). */
695 *base_offset = (offset - negoffset);
696 if (*base_offset <= 0)
697 return got_error(GOT_ERR_BAD_PACKFILE);
703 static const struct got_error *
704 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
705 size_t delta_data_offset, struct got_pack *pack)
707 const struct got_error *err = NULL;
710 if (delta_data_offset >= pack->filesize)
711 return got_error(GOT_ERR_PACK_OFFSET);
712 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
713 NULL, NULL, pack->map, delta_data_offset,
714 pack->filesize - delta_data_offset);
716 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
717 return got_error_from_errno("lseek");
718 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
724 static const struct got_error *
725 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
726 int delta_type, size_t delta_size, size_t delta_data_offset)
728 struct got_delta *delta;
730 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
733 return got_error_from_errno("got_delta_open");
734 /* delta is freed in got_object_close() */
736 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
740 static const struct got_error *
741 resolve_offset_delta(struct got_delta_chain *deltas,
742 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
743 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
746 const struct got_error *err;
751 off_t delta_data_offset;
754 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
755 delta_offset, tslen);
759 delta_data_offset = delta_offset + tslen + consumed;
760 if (delta_data_offset >= pack->filesize)
761 return got_error(GOT_ERR_PACK_OFFSET);
763 if (pack->map == NULL) {
764 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
765 if (delta_data_offset == -1)
766 return got_error_from_errno("lseek");
769 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
774 /* An offset delta must be in the same packfile. */
775 if (base_offset >= pack->filesize)
776 return got_error(GOT_ERR_PACK_OFFSET);
778 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
779 &base_tslen, pack, base_offset);
783 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
784 base_tslen, base_type, base_size, recursion - 1);
787 static const struct got_error *
788 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
789 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
790 size_t delta_size, unsigned int recursion)
792 const struct got_error *err;
793 struct got_object_id id;
799 off_t delta_data_offset;
801 if (delta_offset + tslen >= pack->filesize)
802 return got_error(GOT_ERR_PACK_OFFSET);
805 size_t mapoff = delta_offset + tslen;
806 memcpy(&id, pack->map + mapoff, sizeof(id));
807 mapoff += sizeof(id);
808 delta_data_offset = (off_t)mapoff;
811 n = read(pack->fd, &id, sizeof(id));
813 return got_error_from_errno("read");
815 return got_error(GOT_ERR_BAD_PACKFILE);
816 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
817 if (delta_data_offset == -1)
818 return got_error_from_errno("lseek");
821 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
826 /* Delta base must be in the same pack file. */
827 idx = got_packidx_get_object_idx(packidx, &id);
829 return got_error(GOT_ERR_NO_OBJ);
831 base_offset = get_object_offset(packidx, idx);
832 if (base_offset == (uint64_t)-1)
833 return got_error(GOT_ERR_BAD_PACKIDX);
835 if (base_offset >= pack->filesize)
836 return got_error(GOT_ERR_PACK_OFFSET);
838 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
839 &base_tslen, pack, base_offset);
843 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
844 base_tslen, base_type, base_size, recursion - 1);
847 const struct got_error *
848 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
849 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
850 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
852 const struct got_error *err = NULL;
854 if (--recursion == 0)
855 return got_error(GOT_ERR_RECURSION);
857 switch (delta_type) {
858 case GOT_OBJ_TYPE_COMMIT:
859 case GOT_OBJ_TYPE_TREE:
860 case GOT_OBJ_TYPE_BLOB:
861 case GOT_OBJ_TYPE_TAG:
862 /* Plain types are the final delta base. Recursion ends. */
863 err = add_delta(deltas, delta_offset, tslen, delta_type,
866 case GOT_OBJ_TYPE_OFFSET_DELTA:
867 err = resolve_offset_delta(deltas, packidx, pack,
868 delta_offset, tslen, delta_type, delta_size, recursion - 1);
870 case GOT_OBJ_TYPE_REF_DELTA:
871 err = resolve_ref_delta(deltas, packidx, pack,
872 delta_offset, tslen, delta_type, delta_size, recursion - 1);
875 return got_error(GOT_ERR_OBJ_TYPE);
881 static const struct got_error *
882 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
883 struct got_pack *pack, struct got_object_id *id, off_t offset,
884 size_t tslen, int delta_type, size_t delta_size, int idx)
886 const struct got_error *err = NULL;
889 *obj = calloc(1, sizeof(**obj));
891 return got_error_from_errno("calloc");
895 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
896 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
897 (*obj)->pack_offset = offset + tslen;
899 SIMPLEQ_INIT(&(*obj)->deltas.entries);
900 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
901 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
902 (*obj)->pack_idx = idx;
904 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
905 offset, tslen, delta_type, delta_size,
906 GOT_DELTA_CHAIN_RECURSION_MAX);
910 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
913 (*obj)->type = resolved_type;
916 got_object_close(*obj);
922 const struct got_error *
923 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
924 struct got_packidx *packidx, int idx, struct got_object_id *id)
926 const struct got_error *err = NULL;
934 offset = get_object_offset(packidx, idx);
935 if (offset == (uint64_t)-1)
936 return got_error(GOT_ERR_BAD_PACKIDX);
938 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
944 case GOT_OBJ_TYPE_COMMIT:
945 case GOT_OBJ_TYPE_TREE:
946 case GOT_OBJ_TYPE_BLOB:
947 case GOT_OBJ_TYPE_TAG:
948 err = open_plain_object(obj, id, type, offset + tslen,
951 case GOT_OBJ_TYPE_OFFSET_DELTA:
952 case GOT_OBJ_TYPE_REF_DELTA:
953 err = open_delta_object(obj, packidx, pack, id, offset,
954 tslen, type, size, idx);
957 err = got_error(GOT_ERR_OBJ_TYPE);
964 const struct got_error *
965 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
966 struct got_pack *pack)
968 struct got_delta *delta;
969 uint64_t base_size = 0, result_size = 0;
972 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
973 /* Plain object types are the delta base. */
974 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
975 delta->type != GOT_OBJ_TYPE_TREE &&
976 delta->type != GOT_OBJ_TYPE_BLOB &&
977 delta->type != GOT_OBJ_TYPE_TAG) {
978 const struct got_error *err;
983 got_delta_cache_get(&delta_buf, &delta_len,
984 pack->delta_cache, delta->data_offset);
985 if (delta_buf == NULL) {
987 err = read_delta_data(&delta_buf, &delta_len,
988 delta->data_offset, pack);
991 err = got_delta_cache_add(pack->delta_cache,
992 delta->data_offset, delta_buf, delta_len);
995 else if (err->code != GOT_ERR_NO_SPACE) {
1000 err = got_delta_get_sizes(&base_size, &result_size,
1001 delta_buf, delta_len);
1007 base_size = delta->size;
1008 if (base_size > *max_size)
1009 *max_size = base_size;
1010 if (result_size > *max_size)
1011 *max_size = result_size;
1017 const struct got_error *
1018 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1019 struct got_pack *pack)
1021 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1022 return got_error(GOT_ERR_OBJ_TYPE);
1024 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1027 const struct got_error *
1028 got_pack_dump_delta_chain_to_file(size_t *result_size,
1029 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1030 FILE *base_file, FILE *accum_file)
1032 const struct got_error *err = NULL;
1033 struct got_delta *delta;
1034 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1035 size_t base_bufsz = 0, accum_size = 0, delta_len;
1041 if (SIMPLEQ_EMPTY(&deltas->entries))
1042 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1044 /* We process small enough files entirely in memory for speed. */
1045 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1048 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1049 accum_buf = malloc(max_size);
1050 if (accum_buf == NULL)
1051 return got_error_from_errno("malloc");
1056 /* Deltas are ordered in ascending order. */
1057 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1061 off_t delta_data_offset;
1063 /* Plain object types are the delta base. */
1064 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1065 delta->type != GOT_OBJ_TYPE_TREE &&
1066 delta->type != GOT_OBJ_TYPE_BLOB &&
1067 delta->type != GOT_OBJ_TYPE_TAG) {
1068 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1072 delta_data_offset = delta->offset + delta->tslen;
1073 if (delta_data_offset >= pack->filesize) {
1074 err = got_error(GOT_ERR_PACK_OFFSET);
1077 if (pack->map == NULL) {
1078 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1080 err = got_error_from_errno("lseek");
1086 mapoff = (size_t)delta_data_offset;
1087 err = got_inflate_to_file_mmap(
1088 &base_bufsz, NULL, NULL, pack->map,
1089 mapoff, pack->filesize - mapoff,
1092 err = got_inflate_to_file_fd(
1093 &base_bufsz, NULL, NULL, pack->fd,
1097 mapoff = (size_t)delta_data_offset;
1098 err = got_inflate_to_mem_mmap(&base_buf,
1099 &base_bufsz, NULL, NULL,
1101 pack->filesize - mapoff);
1103 err = got_inflate_to_mem_fd(&base_buf,
1104 &base_bufsz, NULL, NULL, max_size,
1115 got_delta_cache_get(&delta_buf, &delta_len,
1116 pack->delta_cache, delta->data_offset);
1117 if (delta_buf == NULL) {
1119 err = read_delta_data(&delta_buf, &delta_len,
1120 delta->data_offset, pack);
1123 err = got_delta_cache_add(pack->delta_cache,
1124 delta->data_offset, delta_buf, delta_len);
1127 else if (err->code != GOT_ERR_NO_SPACE) {
1133 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1134 delta_buf, delta_len, accum_buf,
1135 &accum_size, max_size);
1138 err = got_delta_apply(base_file, delta_buf,
1140 /* Final delta application writes to output file. */
1141 ++n < deltas->nentries ? accum_file : outfile,
1149 if (n < deltas->nentries) {
1150 /* Accumulated delta becomes the new base. */
1152 uint8_t *tmp = accum_buf;
1154 * Base buffer switches roles with accumulation
1155 * buffer. Ensure it can hold the largest
1156 * result in the delta chain. The initial
1157 * allocation might have been smaller.
1159 if (base_bufsz < max_size) {
1161 p = reallocarray(base_buf, 1, max_size);
1163 err = got_error_from_errno(
1168 base_bufsz = max_size;
1170 accum_buf = base_buf;
1173 FILE *tmp = accum_file;
1174 accum_file = base_file;
1185 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1187 if (len != accum_size)
1188 err = got_ferror(outfile, GOT_ERR_IO);
1192 *result_size = accum_size;
1196 const struct got_error *
1197 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1198 struct got_delta_chain *deltas, struct got_pack *pack)
1200 const struct got_error *err = NULL;
1201 struct got_delta *delta;
1202 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1203 size_t base_bufsz = 0, accum_size = 0, delta_len;
1210 if (SIMPLEQ_EMPTY(&deltas->entries))
1211 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1213 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1216 accum_buf = malloc(max_size);
1217 if (accum_buf == NULL)
1218 return got_error_from_errno("malloc");
1220 /* Deltas are ordered in ascending order. */
1221 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1224 size_t delta_data_offset;
1226 /* Plain object types are the delta base. */
1227 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1228 delta->type != GOT_OBJ_TYPE_TREE &&
1229 delta->type != GOT_OBJ_TYPE_BLOB &&
1230 delta->type != GOT_OBJ_TYPE_TAG) {
1231 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1235 delta_data_offset = delta->offset + delta->tslen;
1236 if (delta_data_offset >= pack->filesize) {
1237 err = got_error(GOT_ERR_PACK_OFFSET);
1241 size_t mapoff = (size_t)delta_data_offset;
1242 err = got_inflate_to_mem_mmap(&base_buf,
1243 &base_bufsz, NULL, NULL, pack->map,
1244 mapoff, pack->filesize - mapoff);
1246 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1248 err = got_error_from_errno("lseek");
1251 err = got_inflate_to_mem_fd(&base_buf,
1252 &base_bufsz, NULL, NULL, max_size,
1261 got_delta_cache_get(&delta_buf, &delta_len,
1262 pack->delta_cache, delta->data_offset);
1263 if (delta_buf == NULL) {
1265 err = read_delta_data(&delta_buf, &delta_len,
1266 delta->data_offset, pack);
1269 err = got_delta_cache_add(pack->delta_cache,
1270 delta->data_offset, delta_buf, delta_len);
1273 else if (err->code != GOT_ERR_NO_SPACE) {
1278 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1279 delta_buf, delta_len, accum_buf,
1280 &accum_size, max_size);
1287 if (n < deltas->nentries) {
1288 /* Accumulated delta becomes the new base. */
1289 uint8_t *tmp = accum_buf;
1291 * Base buffer switches roles with accumulation buffer.
1292 * Ensure it can hold the largest result in the delta
1293 * chain. Initial allocation might have been smaller.
1295 if (base_bufsz < max_size) {
1297 p = reallocarray(base_buf, 1, max_size);
1299 err = got_error_from_errno(
1304 base_bufsz = max_size;
1306 accum_buf = base_buf;
1318 *outbuf = accum_buf;
1319 *outlen = accum_size;
1324 const struct got_error *
1325 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1326 FILE *outfile, FILE *base_file, FILE *accum_file)
1328 const struct got_error *err = NULL;
1330 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1331 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1333 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1334 if (obj->pack_offset >= pack->filesize)
1335 return got_error(GOT_ERR_PACK_OFFSET);
1338 size_t mapoff = (size_t)obj->pack_offset;
1339 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1340 pack->map, mapoff, pack->filesize - mapoff,
1343 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1344 return got_error_from_errno("lseek");
1345 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1349 err = got_pack_dump_delta_chain_to_file(&obj->size,
1350 &obj->deltas, pack, outfile, base_file, accum_file);
1355 const struct got_error *
1356 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1357 struct got_object *obj, struct got_pack *pack)
1359 const struct got_error *err = NULL;
1361 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1362 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1364 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1365 if (obj->pack_offset >= pack->filesize)
1366 return got_error(GOT_ERR_PACK_OFFSET);
1368 size_t mapoff = (size_t)obj->pack_offset;
1369 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1370 pack->map, mapoff, pack->filesize - mapoff);
1372 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1373 return got_error_from_errno("lseek");
1374 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1375 obj->size, pack->fd);
1378 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,