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,
332 int dir_fd, const char *relpath, int verify)
334 const struct got_error *err = NULL;
335 struct got_packidx *p;
340 p = calloc(1, sizeof(*p));
342 return got_error_from_errno("calloc");
344 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW);
346 err = got_error_from_errno2("openat", relpath);
351 if (fstat(p->fd, &sb) != 0) {
352 err = got_error_from_errno2("fstat", relpath);
358 if (p->len < sizeof(p->hdr)) {
359 err = got_error(GOT_ERR_BAD_PACKIDX);
365 p->path_packidx = strdup(relpath);
366 if (p->path_packidx == NULL) {
367 err = got_error_from_errno("strdup");
371 #ifndef GOT_PACK_NO_MMAP
372 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
373 if (p->map == MAP_FAILED) {
374 if (errno != ENOMEM) {
375 err = got_error_from_errno("mmap");
378 p->map = NULL; /* fall back to read(2) */
382 err = got_packidx_init_hdr(p, verify);
385 got_packidx_close(p);
392 const struct got_error *
393 got_packidx_close(struct got_packidx *packidx)
395 const struct got_error *err = NULL;
397 free(packidx->path_packidx);
399 if (munmap(packidx->map, packidx->len) == -1)
400 err = got_error_from_errno("munmap");
402 free(packidx->hdr.magic);
403 free(packidx->hdr.version);
404 free(packidx->hdr.fanout_table);
405 free(packidx->hdr.sorted_ids);
406 free(packidx->hdr.crc32);
407 free(packidx->hdr.offsets);
408 free(packidx->hdr.large_offsets);
409 free(packidx->hdr.trailer);
411 if (close(packidx->fd) != 0 && err == NULL)
412 err = got_error_from_errno("close");
419 get_object_offset(struct got_packidx *packidx, int idx)
421 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
422 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
424 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
425 if (idx < 0 || idx >= packidx->nlargeobj ||
426 packidx->hdr.large_offsets == NULL)
428 loffset = be64toh(packidx->hdr.large_offsets[idx]);
429 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
431 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
435 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
437 u_int8_t id0 = id->sha1[0];
438 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
439 int left = 0, right = totobj - 1;
442 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
444 while (left <= right) {
445 struct got_packidx_object_id *oid;
448 i = ((left + right) / 2);
449 oid = &packidx->hdr.sorted_ids[i];
450 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
462 const struct got_error *
463 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
464 struct got_packidx *packidx, const char *id_str_prefix)
466 const struct got_error *err = NULL;
468 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
470 size_t prefix_len = strlen(id_str_prefix);
471 struct got_packidx_object_id *oid;
474 SIMPLEQ_INIT(matched_ids);
477 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
479 hex[0] = id_str_prefix[0];
480 hex[1] = id_str_prefix[1];
482 if (!got_parse_xdigit(&id0, hex))
483 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
485 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
486 oid = &packidx->hdr.sorted_ids[i];
487 while (i < totobj && oid->sha1[0] == id0) {
488 char id_str[SHA1_DIGEST_STRING_LENGTH];
489 struct got_object_qid *qid;
492 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
493 return got_error(GOT_ERR_NO_SPACE);
495 cmp = strncmp(id_str, id_str_prefix, prefix_len);
497 oid = &packidx->hdr.sorted_ids[++i];
502 err = got_object_qid_alloc_partial(&qid);
505 memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
506 SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry);
508 oid = &packidx->hdr.sorted_ids[++i];
512 got_object_id_queue_free(matched_ids);
516 const struct got_error *
517 got_pack_stop_privsep_child(struct got_pack *pack)
519 const struct got_error *err = NULL;
521 if (pack->privsep_child == NULL)
524 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
527 err = got_privsep_wait_for_child(pack->privsep_child->pid);
528 if (close(pack->privsep_child->imsg_fd) != 0 && err == NULL)
529 err = got_error_from_errno("close");
530 free(pack->privsep_child);
531 pack->privsep_child = NULL;
535 const struct got_error *
536 got_pack_close(struct got_pack *pack)
538 const struct got_error *err = NULL;
540 err = got_pack_stop_privsep_child(pack);
541 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
542 err = got_error_from_errno("munmap");
543 if (pack->fd != -1 && close(pack->fd) != 0 && err == NULL)
544 err = got_error_from_errno("close");
546 free(pack->path_packfile);
547 pack->path_packfile = NULL;
549 if (pack->delta_cache) {
550 got_delta_cache_free(pack->delta_cache);
551 pack->delta_cache = NULL;
557 const struct got_error *
558 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
559 struct got_pack *pack, off_t offset)
569 if (offset >= pack->filesize)
570 return got_error(GOT_ERR_PACK_OFFSET);
573 mapoff = (size_t)offset;
575 if (lseek(pack->fd, offset, SEEK_SET) == -1)
576 return got_error_from_errno("lseek");
580 /* We do not support size values which don't fit in 64 bit. */
582 return got_error(GOT_ERR_NO_SPACE);
585 sizeN = *(pack->map + mapoff);
586 mapoff += sizeof(sizeN);
588 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
590 return got_error_from_errno("read");
591 if (n != sizeof(sizeN))
592 return got_error(GOT_ERR_BAD_PACKFILE);
594 *len += sizeof(sizeN);
597 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
598 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
599 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
601 size_t shift = 4 + 7 * (i - 1);
602 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
605 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
612 static const struct got_error *
613 open_plain_object(struct got_object **obj, struct got_object_id *id,
614 uint8_t type, off_t offset, size_t size, int idx)
616 *obj = calloc(1, sizeof(**obj));
618 return got_error_from_errno("calloc");
621 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
622 (*obj)->pack_idx = idx;
625 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
626 (*obj)->pack_offset = offset;
631 static const struct got_error *
632 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
643 /* We do not support offset values which don't fit in 64 bit. */
645 return got_error(GOT_ERR_NO_SPACE);
649 if (delta_offset >= pack->filesize)
650 return got_error(GOT_ERR_PACK_OFFSET);
651 mapoff = (size_t)delta_offset + *len;
652 offN = *(pack->map + mapoff);
655 n = read(pack->fd, &offN, sizeof(offN));
657 return got_error_from_errno("read");
658 if (n != sizeof(offN))
659 return got_error(GOT_ERR_BAD_PACKFILE);
661 *len += sizeof(offN);
664 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
668 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
671 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
677 const struct got_error *
678 got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
679 off_t offset, int tslen)
681 const struct got_error *err;
687 err = parse_negative_offset(&negoffset, &negofflen, pack,
692 /* Compute the base object's offset (must be in the same pack file). */
693 *base_offset = (offset - negoffset);
694 if (*base_offset <= 0)
695 return got_error(GOT_ERR_BAD_PACKFILE);
701 static const struct got_error *
702 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
703 size_t delta_data_offset, struct got_pack *pack)
705 const struct got_error *err = NULL;
708 if (delta_data_offset >= pack->filesize)
709 return got_error(GOT_ERR_PACK_OFFSET);
710 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
711 NULL, NULL, pack->map, delta_data_offset,
712 pack->filesize - delta_data_offset);
714 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
715 return got_error_from_errno("lseek");
716 err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL,
722 static const struct got_error *
723 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
724 int delta_type, size_t delta_size, size_t delta_data_offset)
726 struct got_delta *delta;
728 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
731 return got_error_from_errno("got_delta_open");
732 /* delta is freed in got_object_close() */
734 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
738 static const struct got_error *
739 resolve_offset_delta(struct got_delta_chain *deltas,
740 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
741 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
744 const struct got_error *err;
749 off_t delta_data_offset;
752 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
753 delta_offset, tslen);
757 delta_data_offset = delta_offset + tslen + consumed;
758 if (delta_data_offset >= pack->filesize)
759 return got_error(GOT_ERR_PACK_OFFSET);
761 if (pack->map == NULL) {
762 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
763 if (delta_data_offset == -1)
764 return got_error_from_errno("lseek");
767 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
772 /* An offset delta must be in the same packfile. */
773 if (base_offset >= pack->filesize)
774 return got_error(GOT_ERR_PACK_OFFSET);
776 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
777 &base_tslen, pack, base_offset);
781 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
782 base_tslen, base_type, base_size, recursion - 1);
785 static const struct got_error *
786 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
787 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
788 size_t delta_size, unsigned int recursion)
790 const struct got_error *err;
791 struct got_object_id id;
797 off_t delta_data_offset;
799 if (delta_offset + tslen >= pack->filesize)
800 return got_error(GOT_ERR_PACK_OFFSET);
803 size_t mapoff = delta_offset + tslen;
804 memcpy(&id, pack->map + mapoff, sizeof(id));
805 mapoff += sizeof(id);
806 delta_data_offset = (off_t)mapoff;
809 n = read(pack->fd, &id, sizeof(id));
811 return got_error_from_errno("read");
813 return got_error(GOT_ERR_BAD_PACKFILE);
814 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
815 if (delta_data_offset == -1)
816 return got_error_from_errno("lseek");
819 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
824 /* Delta base must be in the same pack file. */
825 idx = got_packidx_get_object_idx(packidx, &id);
827 return got_error(GOT_ERR_NO_OBJ);
829 base_offset = get_object_offset(packidx, idx);
830 if (base_offset == (uint64_t)-1)
831 return got_error(GOT_ERR_BAD_PACKIDX);
833 if (base_offset >= pack->filesize)
834 return got_error(GOT_ERR_PACK_OFFSET);
836 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
837 &base_tslen, pack, base_offset);
841 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
842 base_tslen, base_type, base_size, recursion - 1);
845 const struct got_error *
846 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
847 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
848 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
850 const struct got_error *err = NULL;
852 if (--recursion == 0)
853 return got_error(GOT_ERR_RECURSION);
855 switch (delta_type) {
856 case GOT_OBJ_TYPE_COMMIT:
857 case GOT_OBJ_TYPE_TREE:
858 case GOT_OBJ_TYPE_BLOB:
859 case GOT_OBJ_TYPE_TAG:
860 /* Plain types are the final delta base. Recursion ends. */
861 err = add_delta(deltas, delta_offset, tslen, delta_type,
864 case GOT_OBJ_TYPE_OFFSET_DELTA:
865 err = resolve_offset_delta(deltas, packidx, pack,
866 delta_offset, tslen, delta_type, delta_size, recursion - 1);
868 case GOT_OBJ_TYPE_REF_DELTA:
869 err = resolve_ref_delta(deltas, packidx, pack,
870 delta_offset, tslen, delta_type, delta_size, recursion - 1);
873 return got_error(GOT_ERR_OBJ_TYPE);
879 static const struct got_error *
880 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
881 struct got_pack *pack, struct got_object_id *id, off_t offset,
882 size_t tslen, int delta_type, size_t delta_size, int idx)
884 const struct got_error *err = NULL;
887 *obj = calloc(1, sizeof(**obj));
889 return got_error_from_errno("calloc");
893 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
894 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
895 (*obj)->pack_offset = offset + tslen;
897 SIMPLEQ_INIT(&(*obj)->deltas.entries);
898 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
899 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
900 (*obj)->pack_idx = idx;
902 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
903 offset, tslen, delta_type, delta_size,
904 GOT_DELTA_CHAIN_RECURSION_MAX);
908 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
911 (*obj)->type = resolved_type;
914 got_object_close(*obj);
920 const struct got_error *
921 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
922 struct got_packidx *packidx, int idx, struct got_object_id *id)
924 const struct got_error *err = NULL;
932 offset = get_object_offset(packidx, idx);
933 if (offset == (uint64_t)-1)
934 return got_error(GOT_ERR_BAD_PACKIDX);
936 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
942 case GOT_OBJ_TYPE_COMMIT:
943 case GOT_OBJ_TYPE_TREE:
944 case GOT_OBJ_TYPE_BLOB:
945 case GOT_OBJ_TYPE_TAG:
946 err = open_plain_object(obj, id, type, offset + tslen,
949 case GOT_OBJ_TYPE_OFFSET_DELTA:
950 case GOT_OBJ_TYPE_REF_DELTA:
951 err = open_delta_object(obj, packidx, pack, id, offset,
952 tslen, type, size, idx);
955 err = got_error(GOT_ERR_OBJ_TYPE);
962 const struct got_error *
963 got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
964 struct got_pack *pack)
966 struct got_delta *delta;
967 uint64_t base_size = 0, result_size = 0;
970 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
971 /* Plain object types are the delta base. */
972 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
973 delta->type != GOT_OBJ_TYPE_TREE &&
974 delta->type != GOT_OBJ_TYPE_BLOB &&
975 delta->type != GOT_OBJ_TYPE_TAG) {
976 const struct got_error *err;
981 got_delta_cache_get(&delta_buf, &delta_len,
982 pack->delta_cache, delta->data_offset);
983 if (delta_buf == NULL) {
985 err = read_delta_data(&delta_buf, &delta_len,
986 delta->data_offset, pack);
989 err = got_delta_cache_add(pack->delta_cache,
990 delta->data_offset, delta_buf, delta_len);
993 else if (err->code != GOT_ERR_NO_SPACE) {
998 err = got_delta_get_sizes(&base_size, &result_size,
999 delta_buf, delta_len);
1005 base_size = delta->size;
1006 if (base_size > *max_size)
1007 *max_size = base_size;
1008 if (result_size > *max_size)
1009 *max_size = result_size;
1015 const struct got_error *
1016 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1017 struct got_pack *pack)
1019 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1020 return got_error(GOT_ERR_OBJ_TYPE);
1022 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1025 const struct got_error *
1026 got_pack_dump_delta_chain_to_file(size_t *result_size,
1027 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1028 FILE *base_file, FILE *accum_file)
1030 const struct got_error *err = NULL;
1031 struct got_delta *delta;
1032 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1033 size_t base_bufsz = 0, accum_size = 0, delta_len;
1039 if (SIMPLEQ_EMPTY(&deltas->entries))
1040 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1042 /* We process small enough files entirely in memory for speed. */
1043 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1046 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1047 accum_buf = malloc(max_size);
1048 if (accum_buf == NULL)
1049 return got_error_from_errno("malloc");
1054 /* Deltas are ordered in ascending order. */
1055 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1059 off_t delta_data_offset;
1061 /* Plain object types are the delta base. */
1062 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1063 delta->type != GOT_OBJ_TYPE_TREE &&
1064 delta->type != GOT_OBJ_TYPE_BLOB &&
1065 delta->type != GOT_OBJ_TYPE_TAG) {
1066 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1070 delta_data_offset = delta->offset + delta->tslen;
1071 if (delta_data_offset >= pack->filesize) {
1072 err = got_error(GOT_ERR_PACK_OFFSET);
1075 if (pack->map == NULL) {
1076 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1078 err = got_error_from_errno("lseek");
1084 mapoff = (size_t)delta_data_offset;
1085 err = got_inflate_to_file_mmap(
1086 &base_bufsz, NULL, NULL, pack->map,
1087 mapoff, pack->filesize - mapoff,
1090 err = got_inflate_to_file_fd(
1091 &base_bufsz, NULL, NULL, pack->fd,
1095 mapoff = (size_t)delta_data_offset;
1096 err = got_inflate_to_mem_mmap(&base_buf,
1097 &base_bufsz, NULL, NULL,
1099 pack->filesize - mapoff);
1101 err = got_inflate_to_mem_fd(&base_buf,
1102 &base_bufsz, NULL, NULL, max_size,
1113 got_delta_cache_get(&delta_buf, &delta_len,
1114 pack->delta_cache, delta->data_offset);
1115 if (delta_buf == NULL) {
1117 err = read_delta_data(&delta_buf, &delta_len,
1118 delta->data_offset, pack);
1121 err = got_delta_cache_add(pack->delta_cache,
1122 delta->data_offset, delta_buf, delta_len);
1125 else if (err->code != GOT_ERR_NO_SPACE) {
1131 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1132 delta_buf, delta_len, accum_buf,
1133 &accum_size, max_size);
1136 err = got_delta_apply(base_file, delta_buf,
1138 /* Final delta application writes to output file. */
1139 ++n < deltas->nentries ? accum_file : outfile,
1147 if (n < deltas->nentries) {
1148 /* Accumulated delta becomes the new base. */
1150 uint8_t *tmp = accum_buf;
1152 * Base buffer switches roles with accumulation
1153 * buffer. Ensure it can hold the largest
1154 * result in the delta chain. The initial
1155 * allocation might have been smaller.
1157 if (base_bufsz < max_size) {
1159 p = reallocarray(base_buf, 1, max_size);
1161 err = got_error_from_errno(
1166 base_bufsz = max_size;
1168 accum_buf = base_buf;
1171 FILE *tmp = accum_file;
1172 accum_file = base_file;
1183 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1185 if (len != accum_size)
1186 err = got_ferror(outfile, GOT_ERR_IO);
1190 *result_size = accum_size;
1194 const struct got_error *
1195 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1196 struct got_delta_chain *deltas, struct got_pack *pack)
1198 const struct got_error *err = NULL;
1199 struct got_delta *delta;
1200 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1201 size_t base_bufsz = 0, accum_size = 0, delta_len;
1208 if (SIMPLEQ_EMPTY(&deltas->entries))
1209 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1211 err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1214 accum_buf = malloc(max_size);
1215 if (accum_buf == NULL)
1216 return got_error_from_errno("malloc");
1218 /* Deltas are ordered in ascending order. */
1219 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1222 size_t delta_data_offset;
1224 /* Plain object types are the delta base. */
1225 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1226 delta->type != GOT_OBJ_TYPE_TREE &&
1227 delta->type != GOT_OBJ_TYPE_BLOB &&
1228 delta->type != GOT_OBJ_TYPE_TAG) {
1229 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1233 delta_data_offset = delta->offset + delta->tslen;
1234 if (delta_data_offset >= pack->filesize) {
1235 err = got_error(GOT_ERR_PACK_OFFSET);
1239 size_t mapoff = (size_t)delta_data_offset;
1240 err = got_inflate_to_mem_mmap(&base_buf,
1241 &base_bufsz, NULL, NULL, pack->map,
1242 mapoff, pack->filesize - mapoff);
1244 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1246 err = got_error_from_errno("lseek");
1249 err = got_inflate_to_mem_fd(&base_buf,
1250 &base_bufsz, NULL, NULL, max_size,
1259 got_delta_cache_get(&delta_buf, &delta_len,
1260 pack->delta_cache, delta->data_offset);
1261 if (delta_buf == NULL) {
1263 err = read_delta_data(&delta_buf, &delta_len,
1264 delta->data_offset, pack);
1267 err = got_delta_cache_add(pack->delta_cache,
1268 delta->data_offset, delta_buf, delta_len);
1271 else if (err->code != GOT_ERR_NO_SPACE) {
1276 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1277 delta_buf, delta_len, accum_buf,
1278 &accum_size, max_size);
1285 if (n < deltas->nentries) {
1286 /* Accumulated delta becomes the new base. */
1287 uint8_t *tmp = accum_buf;
1289 * Base buffer switches roles with accumulation buffer.
1290 * Ensure it can hold the largest result in the delta
1291 * chain. Initial allocation might have been smaller.
1293 if (base_bufsz < max_size) {
1295 p = reallocarray(base_buf, 1, max_size);
1297 err = got_error_from_errno(
1302 base_bufsz = max_size;
1304 accum_buf = base_buf;
1316 *outbuf = accum_buf;
1317 *outlen = accum_size;
1322 const struct got_error *
1323 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1324 FILE *outfile, FILE *base_file, FILE *accum_file)
1326 const struct got_error *err = NULL;
1328 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1329 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1331 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1332 if (obj->pack_offset >= pack->filesize)
1333 return got_error(GOT_ERR_PACK_OFFSET);
1336 size_t mapoff = (size_t)obj->pack_offset;
1337 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1338 pack->map, mapoff, pack->filesize - mapoff,
1341 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1342 return got_error_from_errno("lseek");
1343 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1347 err = got_pack_dump_delta_chain_to_file(&obj->size,
1348 &obj->deltas, pack, outfile, base_file, accum_file);
1353 const struct got_error *
1354 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1355 struct got_object *obj, struct got_pack *pack)
1357 const struct got_error *err = NULL;
1359 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1360 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1362 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1363 if (obj->pack_offset >= pack->filesize)
1364 return got_error(GOT_ERR_PACK_OFFSET);
1366 size_t mapoff = (size_t)obj->pack_offset;
1367 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1368 pack->map, mapoff, pack->filesize - mapoff);
1370 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1371 return got_error_from_errno("lseek");
1372 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1373 obj->size, pack->fd);
1376 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,