2 * Copyright (c) 2018, 2019 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>
35 #include "got_error.h"
36 #include "got_object.h"
37 #include "got_opentemp.h"
39 #include "got_lib_sha1.h"
40 #include "got_lib_path.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_object.h"
44 #include "got_lib_privsep.h"
45 #include "got_lib_pack.h"
48 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
52 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 static const struct got_error *
56 verify_fanout_table(uint32_t *fanout_table)
60 for (i = 0; i < 0xff - 1; i++) {
61 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
62 return got_error(GOT_ERR_BAD_PACKIDX);
68 const struct got_error *
69 got_pack_get_packfile_size(size_t *size, const char *path)
76 dot = strrchr(path, '.');
78 return got_error(GOT_ERR_BAD_PATH);
80 /* Path must point to a pack index or to a pack file. */
81 if (strcmp(dot, GOT_PACKIDX_SUFFIX) == 0) {
82 const struct got_error *err = NULL;
84 char base_path[PATH_MAX];
86 /* Convert pack index path to pack file path. */
87 if (strlcpy(base_path, path, PATH_MAX) > PATH_MAX)
88 return got_error(GOT_ERR_NO_SPACE);
89 dot = strrchr(base_path, '.');
91 return got_error(GOT_ERR_BAD_PATH);
93 if (asprintf(&path_pack, "%s.pack", base_path) == -1)
94 return got_error_from_errno();
96 if (stat(path_pack, &sb) != 0)
97 err = got_error_from_errno();
101 } else if (strcmp(dot, GOT_PACKFILE_SUFFIX) == 0) {
102 if (stat(path, &sb) != 0)
103 return got_error_from_errno();
105 return got_error(GOT_ERR_BAD_PATH);
111 const struct got_error *
112 got_packidx_init_hdr(struct got_packidx *p, int verify)
114 const struct got_error *err = NULL;
115 struct got_packidx_v2_hdr *h;
117 uint8_t sha1[SHA1_DIGEST_LENGTH];
118 size_t nobj, len_fanout, len_ids, offset, remain;
127 if (remain < sizeof(*h->magic)) {
128 err = got_error(GOT_ERR_BAD_PACKIDX);
132 h->magic = (uint32_t *)(p->map + offset);
134 h->magic = malloc(sizeof(*h->magic));
135 if (h->magic == NULL) {
136 err = got_error_from_errno();
139 n = read(p->fd, h->magic, sizeof(*h->magic));
141 err = got_error_from_errno();
142 else if (n != sizeof(*h->magic)) {
143 err = got_error(GOT_ERR_BAD_PACKIDX);
147 if (betoh32(*h->magic) != GOT_PACKIDX_V2_MAGIC) {
148 err = got_error(GOT_ERR_BAD_PACKIDX);
151 offset += sizeof(*h->magic);
152 remain -= sizeof(*h->magic);
155 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
157 if (remain < sizeof(*h->version)) {
158 err = got_error(GOT_ERR_BAD_PACKIDX);
162 h->version = (uint32_t *)(p->map + offset);
164 h->version = malloc(sizeof(*h->version));
165 if (h->version == NULL) {
166 err = got_error_from_errno();
169 n = read(p->fd, h->version, sizeof(*h->version));
171 err = got_error_from_errno();
172 else if (n != sizeof(*h->version)) {
173 err = got_error(GOT_ERR_BAD_PACKIDX);
177 if (betoh32(*h->version) != GOT_PACKIDX_VERSION) {
178 err = got_error(GOT_ERR_BAD_PACKIDX);
181 offset += sizeof(*h->version);
182 remain -= sizeof(*h->version);
185 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
188 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
189 if (remain < len_fanout) {
190 err = got_error(GOT_ERR_BAD_PACKIDX);
194 h->fanout_table = (uint32_t *)(p->map + offset);
196 h->fanout_table = malloc(len_fanout);
197 if (h->fanout_table == NULL) {
198 err = got_error_from_errno();
201 n = read(p->fd, h->fanout_table, len_fanout);
203 err = got_error_from_errno();
204 else if (n != len_fanout) {
205 err = got_error(GOT_ERR_BAD_PACKIDX);
209 err = verify_fanout_table(h->fanout_table);
213 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
214 offset += len_fanout;
215 remain -= len_fanout;
217 nobj = betoh32(h->fanout_table[0xff]);
218 len_ids = nobj * sizeof(*h->sorted_ids);
219 if (len_ids <= nobj || len_ids > remain) {
220 err = got_error(GOT_ERR_BAD_PACKIDX);
225 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
227 h->sorted_ids = malloc(len_ids);
228 if (h->sorted_ids == NULL) {
229 err = got_error(GOT_ERR_BAD_PACKIDX);
232 n = read(p->fd, h->sorted_ids, len_ids);
234 err = got_error_from_errno();
235 else if (n != len_ids) {
236 err = got_error(GOT_ERR_BAD_PACKIDX);
241 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
245 if (remain < nobj * sizeof(*h->crc32)) {
246 err = got_error(GOT_ERR_BAD_PACKIDX);
250 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
252 h->crc32 = malloc(nobj * sizeof(*h->crc32));
253 if (h->crc32 == NULL) {
254 err = got_error_from_errno();
257 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
259 err = got_error_from_errno();
260 else if (n != nobj * sizeof(*h->crc32)) {
261 err = got_error(GOT_ERR_BAD_PACKIDX);
266 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
267 remain -= nobj * sizeof(*h->crc32);
268 offset += nobj * sizeof(*h->crc32);
270 if (remain < nobj * sizeof(*h->offsets)) {
271 err = got_error(GOT_ERR_BAD_PACKIDX);
275 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
277 h->offsets = malloc(nobj * sizeof(*h->offsets));
278 if (h->offsets == NULL) {
279 err = got_error_from_errno();
282 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
284 err = got_error_from_errno();
285 else if (n != nobj * sizeof(*h->offsets)) {
286 err = got_error(GOT_ERR_BAD_PACKIDX);
291 SHA1Update(&ctx, (uint8_t *)h->offsets,
292 nobj * sizeof(*h->offsets));
293 remain -= nobj * sizeof(*h->offsets);
294 offset += nobj * sizeof(*h->offsets);
296 /* Large file offsets are contained only in files > 2GB. */
297 if (p->len <= 0x80000000)
300 if (remain < nobj * sizeof(*h->large_offsets)) {
301 err = got_error(GOT_ERR_BAD_PACKIDX);
305 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
307 h->offsets = malloc(nobj * sizeof(*h->large_offsets));
308 if (h->offsets == NULL) {
309 err = got_error_from_errno();
312 n = read(p->fd, h->large_offsets,
313 nobj * sizeof(*h->large_offsets));
315 err = got_error_from_errno();
316 else if (n != nobj * sizeof(*h->large_offsets)) {
317 err = got_error(GOT_ERR_BAD_PACKIDX);
322 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
323 nobj * sizeof(*h->large_offsets));
324 remain -= nobj * sizeof(*h->large_offsets);
325 offset += nobj * sizeof(*h->large_offsets);
328 if (remain < sizeof(*h->trailer)) {
329 err = got_error(GOT_ERR_BAD_PACKIDX);
334 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
336 h->trailer = malloc(sizeof(*h->trailer));
337 if (h->trailer == NULL) {
338 err = got_error_from_errno();
341 n = read(p->fd, h->trailer, sizeof(*h->trailer));
343 err = got_error_from_errno();
344 else if (n != sizeof(*h->trailer)) {
345 err = got_error(GOT_ERR_BAD_PACKIDX);
350 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
351 SHA1Final(sha1, &ctx);
352 if (memcmp(h->trailer->packidx_sha1, sha1,
353 SHA1_DIGEST_LENGTH) != 0)
354 err = got_error(GOT_ERR_PACKIDX_CSUM);
360 const struct got_error *
361 got_packidx_open(struct got_packidx **packidx, const char *path, int verify)
363 const struct got_error *err = NULL;
364 struct got_packidx *p;
368 p = calloc(1, sizeof(*p));
370 return got_error_from_errno();
372 p->fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
374 return got_error_from_errno();
376 err = got_pack_get_packfile_size(&p->len, path);
382 if (p->len < sizeof(p->hdr)) {
383 err = got_error(GOT_ERR_BAD_PACKIDX);
389 p->path_packidx = strdup(path);
390 if (p->path_packidx == NULL) {
391 err = got_error_from_errno();
395 #ifndef GOT_PACK_NO_MMAP
396 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
397 if (p->map == MAP_FAILED)
398 p->map = NULL; /* fall back to read(2) */
401 err = got_packidx_init_hdr(p, verify);
404 got_packidx_close(p);
411 const struct got_error *
412 got_packidx_close(struct got_packidx *packidx)
414 const struct got_error *err = NULL;
416 free(packidx->path_packidx);
418 if (munmap(packidx->map, packidx->len) == -1)
419 err = got_error_from_errno();
421 free(packidx->hdr.magic);
422 free(packidx->hdr.version);
423 free(packidx->hdr.fanout_table);
424 free(packidx->hdr.sorted_ids);
425 free(packidx->hdr.crc32);
426 free(packidx->hdr.offsets);
427 free(packidx->hdr.large_offsets);
428 free(packidx->hdr.trailer);
437 get_object_offset(struct got_packidx *packidx, int idx)
439 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
440 uint32_t offset = betoh32(packidx->hdr.offsets[idx]);
441 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
443 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
444 if (idx < 0 || idx > totobj ||
445 packidx->hdr.large_offsets == NULL)
447 loffset = betoh64(packidx->hdr.large_offsets[idx]);
448 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
450 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
454 got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
456 u_int8_t id0 = id->sha1[0];
457 uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
458 int left = 0, right = totobj - 1;
461 left = betoh32(packidx->hdr.fanout_table[id0 - 1]);
463 while (left <= right) {
464 struct got_packidx_object_id *oid;
467 i = ((left + right) / 2);
468 oid = &packidx->hdr.sorted_ids[i];
469 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
481 const struct got_error *
482 got_pack_stop_privsep_child(struct got_pack *pack)
484 const struct got_error *err = NULL;
486 if (pack->privsep_child == NULL)
489 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
492 err = got_privsep_wait_for_child(pack->privsep_child->pid);
493 free(pack->privsep_child);
494 pack->privsep_child = NULL;
498 const struct got_error *
499 got_pack_close(struct got_pack *pack)
501 const struct got_error *err = NULL;
503 err = got_pack_stop_privsep_child(pack);
504 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
505 err = got_error_from_errno();
508 free(pack->path_packfile);
509 pack->path_packfile = NULL;
515 static const struct got_error *
516 parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
517 struct got_pack *pack, off_t offset)
527 if (offset >= pack->filesize)
528 return got_error(GOT_ERR_PACK_OFFSET);
531 mapoff = (size_t)offset;
533 if (lseek(pack->fd, offset, SEEK_SET) == -1)
534 return got_error_from_errno();
538 /* We do not support size values which don't fit in 64 bit. */
540 return got_error(GOT_ERR_NO_SPACE);
543 sizeN = *(pack->map + mapoff);
544 mapoff += sizeof(sizeN);
546 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
548 return got_error_from_errno();
549 if (n != sizeof(sizeN))
550 return got_error(GOT_ERR_BAD_PACKFILE);
552 *len += sizeof(sizeN);
555 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
556 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
557 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
559 size_t shift = 4 + 7 * (i - 1);
560 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
563 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
570 static const struct got_error *
571 open_plain_object(struct got_object **obj, const char *path_packfile,
572 struct got_object_id *id, uint8_t type, off_t offset, size_t size, int idx)
574 *obj = calloc(1, sizeof(**obj));
576 return got_error_from_errno();
578 (*obj)->path_packfile = strdup(path_packfile);
579 if ((*obj)->path_packfile == NULL) {
580 const struct got_error *err = got_error_from_errno();
587 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
588 (*obj)->pack_idx = idx;
591 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
592 (*obj)->pack_offset = offset;
597 static const struct got_error *
598 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
608 /* We do not support offset values which don't fit in 64 bit. */
610 return got_error(GOT_ERR_NO_SPACE);
614 if (delta_offset >= pack->filesize)
615 return got_error(GOT_ERR_PACK_OFFSET);
616 mapoff = (size_t)delta_offset + *len;
617 offN = *(pack->map + mapoff);
620 n = read(pack->fd, &offN, sizeof(offN));
622 return got_error_from_errno();
623 if (n != sizeof(offN))
624 return got_error(GOT_ERR_BAD_PACKFILE);
626 *len += sizeof(offN);
629 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
633 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
636 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
642 static const struct got_error *
643 parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
644 off_t offset, int tslen)
646 const struct got_error *err;
652 err = parse_negative_offset(&negoffset, &negofflen, pack,
657 /* Compute the base object's offset (must be in the same pack file). */
658 *base_offset = (offset - negoffset);
659 if (*base_offset <= 0)
660 return got_error(GOT_ERR_BAD_PACKFILE);
666 static const struct got_error *
667 resolve_delta_chain(struct got_delta_chain *, struct got_packidx *,
668 struct got_pack *, off_t, size_t, int, size_t, unsigned int);
670 static const struct got_error *
671 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
672 int delta_type, size_t delta_size, size_t delta_data_offset,
673 uint8_t *delta_buf, size_t delta_len)
675 struct got_delta *delta;
677 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
678 delta_data_offset, delta_buf,
681 return got_error_from_errno();
682 /* delta is freed in got_object_close() */
684 SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry);
688 static const struct got_error *
689 resolve_offset_delta(struct got_delta_chain *deltas,
690 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
691 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
694 const struct got_error *err;
699 off_t delta_data_offset;
701 size_t delta_len, consumed;
703 err = parse_offset_delta(&base_offset, &consumed, pack,
704 delta_offset, tslen);
708 delta_data_offset = delta_offset + tslen + consumed;
709 if (delta_data_offset >= pack->filesize)
710 return got_error(GOT_ERR_PACK_OFFSET);
712 if (pack->map == NULL) {
713 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
714 if (delta_data_offset == -1)
715 return got_error_from_errno();
719 size_t mapoff = (size_t)delta_data_offset;
720 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
721 mapoff, pack->filesize - mapoff);
726 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
731 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
732 delta_data_offset, delta_buf, delta_len);
736 /* An offset delta must be in the same packfile. */
737 if (base_offset >= pack->filesize) {
738 err = got_error(GOT_ERR_PACK_OFFSET);
742 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
747 err = resolve_delta_chain(deltas, packidx, pack, base_offset,
748 base_tslen, base_type, base_size, recursion - 1);
755 static const struct got_error *
756 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
757 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
758 size_t delta_size, unsigned int recursion)
760 const struct got_error *err;
761 struct got_object_id id;
767 off_t delta_data_offset;
768 uint8_t *delta_buf = NULL;
771 if (delta_offset >= pack->filesize)
772 return got_error(GOT_ERR_PACK_OFFSET);
773 delta_data_offset = delta_offset + tslen;
774 if (delta_data_offset >= pack->filesize)
775 return got_error(GOT_ERR_PACK_OFFSET);
777 if (pack->map == NULL) {
778 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
779 if (delta_data_offset == -1)
780 return got_error_from_errno();
785 size_t mapoff = (size_t)delta_data_offset;
786 memcpy(&id, pack->map + mapoff, sizeof(id));
787 mapoff += sizeof(id);
788 err = got_inflate_to_mem_mmap(&delta_buf, &delta_len, pack->map,
789 mapoff, pack->filesize - mapoff);
793 ssize_t n = read(pack->fd, &id, sizeof(id));
795 return got_error_from_errno();
797 return got_error(GOT_ERR_BAD_PACKFILE);
798 err = got_inflate_to_mem_fd(&delta_buf, &delta_len, pack->fd);
803 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
804 delta_data_offset, delta_buf, delta_len);
808 /* Delta base must be in the same pack file. */
809 idx = got_packidx_get_object_idx(packidx, &id);
811 err = got_error(GOT_ERR_BAD_PACKFILE);
815 base_offset = get_object_offset(packidx, idx);
816 if (base_offset == (uint64_t)-1) {
817 err = got_error(GOT_ERR_BAD_PACKIDX);
821 if (base_offset >= pack->filesize) {
822 err = got_error(GOT_ERR_PACK_OFFSET);
826 err = parse_object_type_and_size(&base_type, &base_size, &base_tslen,
831 err = resolve_delta_chain(deltas, packidx, pack, base_offset,
832 base_tslen, base_type, base_size, recursion - 1);
839 static const struct got_error *
840 resolve_delta_chain(struct got_delta_chain *deltas, struct got_packidx *packidx,
841 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
842 size_t delta_size, unsigned int recursion)
844 const struct got_error *err = NULL;
846 if (--recursion == 0)
847 return got_error(GOT_ERR_RECURSION);
849 switch (delta_type) {
850 case GOT_OBJ_TYPE_COMMIT:
851 case GOT_OBJ_TYPE_TREE:
852 case GOT_OBJ_TYPE_BLOB:
853 case GOT_OBJ_TYPE_TAG:
854 /* Plain types are the final delta base. Recursion ends. */
855 err = add_delta(deltas, delta_offset, tslen, delta_type,
856 delta_size, 0, NULL, 0);
858 case GOT_OBJ_TYPE_OFFSET_DELTA:
859 err = resolve_offset_delta(deltas, packidx, pack,
860 delta_offset, tslen, delta_type, delta_size, recursion - 1);
862 case GOT_OBJ_TYPE_REF_DELTA:
863 err = resolve_ref_delta(deltas, packidx, pack,
864 delta_offset, tslen, delta_type, delta_size, recursion - 1);
867 return got_error(GOT_ERR_OBJ_TYPE);
873 static const struct got_error *
874 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
875 struct got_pack *pack, struct got_object_id *id, off_t offset,
876 size_t tslen, int delta_type, size_t delta_size, int idx)
878 const struct got_error *err = NULL;
881 *obj = calloc(1, sizeof(**obj));
883 return got_error_from_errno();
887 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
888 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
889 (*obj)->pack_offset = offset + tslen;
891 (*obj)->path_packfile = strdup(pack->path_packfile);
892 if ((*obj)->path_packfile == NULL) {
893 err = got_error_from_errno();
896 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
897 (*obj)->pack_idx = idx;
899 SIMPLEQ_INIT(&(*obj)->deltas.entries);
900 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
902 err = resolve_delta_chain(&(*obj)->deltas, packidx, pack, offset,
903 tslen, delta_type, delta_size, GOT_DELTA_CHAIN_RECURSION_MAX);
907 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
910 (*obj)->type = resolved_type;
913 got_object_close(*obj);
919 const struct got_error *
920 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
921 struct got_packidx *packidx, int idx, struct got_object_id *id)
923 const struct got_error *err = NULL;
931 offset = get_object_offset(packidx, idx);
932 if (offset == (uint64_t)-1)
933 return got_error(GOT_ERR_BAD_PACKIDX);
935 err = parse_object_type_and_size(&type, &size, &tslen, pack, offset);
940 case GOT_OBJ_TYPE_COMMIT:
941 case GOT_OBJ_TYPE_TREE:
942 case GOT_OBJ_TYPE_BLOB:
943 case GOT_OBJ_TYPE_TAG:
944 err = open_plain_object(obj, pack->path_packfile, id, type,
945 offset + tslen, size, idx);
947 case GOT_OBJ_TYPE_OFFSET_DELTA:
948 case GOT_OBJ_TYPE_REF_DELTA:
949 err = open_delta_object(obj, packidx, pack, id, offset,
950 tslen, type, size, idx);
953 err = got_error(GOT_ERR_OBJ_TYPE);
960 static const struct got_error *
961 get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas)
963 struct got_delta *delta;
964 uint64_t base_size = 0, result_size = 0;
967 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
968 /* Plain object types are the delta base. */
969 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
970 delta->type != GOT_OBJ_TYPE_TREE &&
971 delta->type != GOT_OBJ_TYPE_BLOB &&
972 delta->type != GOT_OBJ_TYPE_TAG) {
973 const struct got_error *err;
974 err = got_delta_get_sizes(&base_size, &result_size,
975 delta->delta_buf, delta->delta_len);
979 base_size = delta->size;
980 if (base_size > *max_size)
981 *max_size = base_size;
982 if (result_size > *max_size)
983 *max_size = result_size;
989 const struct got_error *
990 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj)
992 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
993 return got_error(GOT_ERR_OBJ_TYPE);
995 return get_delta_chain_max_size(size, &obj->deltas);
998 static const struct got_error *
999 dump_delta_chain_to_file(size_t *result_size, struct got_delta_chain *deltas,
1000 struct got_pack *pack, FILE *outfile, FILE *base_file, FILE *accum_file)
1002 const struct got_error *err = NULL;
1003 struct got_delta *delta;
1004 uint8_t *base_buf = NULL, *accum_buf = NULL;
1005 size_t base_bufsz = 0, accum_size = 0;
1011 if (SIMPLEQ_EMPTY(&deltas->entries))
1012 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1014 /* We process small enough files entirely in memory for speed. */
1015 err = get_delta_chain_max_size(&max_size, deltas);
1018 if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1019 accum_buf = malloc(max_size);
1020 if (accum_buf == NULL)
1021 return got_error_from_errno();
1026 /* Deltas are ordered in ascending order. */
1027 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1030 off_t delta_data_offset;
1032 /* Plain object types are the delta base. */
1033 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1034 delta->type != GOT_OBJ_TYPE_TREE &&
1035 delta->type != GOT_OBJ_TYPE_BLOB &&
1036 delta->type != GOT_OBJ_TYPE_TAG) {
1037 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1041 delta_data_offset = delta->offset + delta->tslen;
1042 if (delta_data_offset >= pack->filesize) {
1043 err = got_error(GOT_ERR_PACK_OFFSET);
1046 if (pack->map == NULL) {
1047 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1049 err = got_error_from_errno();
1055 mapoff = (size_t)delta_data_offset;
1056 err = got_inflate_to_file_mmap(
1057 &base_bufsz, pack->map, mapoff,
1058 pack->filesize - mapoff, base_file);
1060 err = got_inflate_to_file_fd(
1061 &base_bufsz, pack->fd, base_file);
1064 mapoff = (size_t)delta_data_offset;
1065 err = got_inflate_to_mem_mmap(&base_buf,
1066 &base_bufsz, pack->map, mapoff,
1067 pack->filesize - mapoff);
1069 err = got_inflate_to_mem_fd(&base_buf,
1070 &base_bufsz, pack->fd);
1081 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1082 delta->delta_buf, delta->delta_len, accum_buf,
1083 &accum_size, max_size);
1086 err = got_delta_apply(base_file, delta->delta_buf,
1088 /* Final delta application writes to output file. */
1089 ++n < deltas->nentries ? accum_file : outfile,
1095 if (n < deltas->nentries) {
1096 /* Accumulated delta becomes the new base. */
1098 uint8_t *tmp = accum_buf;
1100 * Base buffer switches roles with accumulation
1101 * buffer. Ensure it can hold the largest
1102 * result in the delta chain. The initial
1103 * allocation might have been smaller.
1105 if (base_bufsz < max_size) {
1107 p = reallocarray(base_buf, 1, max_size);
1109 err = got_error_from_errno();
1113 base_bufsz = max_size;
1115 accum_buf = base_buf;
1118 FILE *tmp = accum_file;
1119 accum_file = base_file;
1130 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1132 if (len != accum_size)
1133 err = got_ferror(outfile, GOT_ERR_IO);
1141 *result_size = accum_size;
1145 static const struct got_error *
1146 dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1147 struct got_delta_chain *deltas, struct got_pack *pack)
1149 const struct got_error *err = NULL;
1150 struct got_delta *delta;
1151 uint8_t *base_buf = NULL, *accum_buf = NULL;
1152 size_t base_bufsz = 0, accum_size = 0;
1159 if (SIMPLEQ_EMPTY(&deltas->entries))
1160 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1162 err = get_delta_chain_max_size(&max_size, deltas);
1165 accum_buf = malloc(max_size);
1166 if (accum_buf == NULL)
1167 return got_error_from_errno();
1169 /* Deltas are ordered in ascending order. */
1170 SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
1172 size_t delta_data_offset;
1174 /* Plain object types are the delta base. */
1175 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1176 delta->type != GOT_OBJ_TYPE_TREE &&
1177 delta->type != GOT_OBJ_TYPE_BLOB &&
1178 delta->type != GOT_OBJ_TYPE_TAG) {
1179 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1183 delta_data_offset = delta->offset + delta->tslen;
1184 if (delta_data_offset >= pack->filesize) {
1185 err = got_error(GOT_ERR_PACK_OFFSET);
1189 size_t mapoff = (size_t)delta_data_offset;
1190 err = got_inflate_to_mem_mmap(&base_buf,
1191 &base_bufsz, pack->map, mapoff,
1192 pack->filesize - mapoff);
1194 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1196 err = got_error_from_errno();
1199 err = got_inflate_to_mem_fd(&base_buf,
1200 &base_bufsz, pack->fd);
1208 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1209 delta->delta_buf, delta->delta_len, accum_buf,
1210 &accum_size, max_size);
1215 if (n < deltas->nentries) {
1216 /* Accumulated delta becomes the new base. */
1217 uint8_t *tmp = accum_buf;
1219 * Base buffer switches roles with accumulation buffer.
1220 * Ensure it can hold the largest result in the delta
1221 * chain. Initial allocation might have been smaller.
1223 if (base_bufsz < max_size) {
1225 p = reallocarray(base_buf, 1, max_size);
1227 err = got_error_from_errno();
1231 base_bufsz = max_size;
1233 accum_buf = base_buf;
1245 *outbuf = accum_buf;
1246 *outlen = accum_size;
1251 const struct got_error *
1252 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1253 FILE *outfile, FILE *base_file, FILE *accum_file)
1255 const struct got_error *err = NULL;
1257 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1258 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1260 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1261 if (obj->pack_offset >= pack->filesize)
1262 return got_error(GOT_ERR_PACK_OFFSET);
1265 size_t mapoff = (size_t)obj->pack_offset;
1266 err = got_inflate_to_file_mmap(&obj->size, pack->map,
1267 mapoff, pack->filesize - mapoff, outfile);
1269 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1270 return got_error_from_errno();
1271 err = got_inflate_to_file_fd(&obj->size, pack->fd,
1275 err = dump_delta_chain_to_file(&obj->size, &obj->deltas, pack,
1276 outfile, base_file, accum_file);
1281 const struct got_error *
1282 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1283 struct got_object *obj, struct got_pack *pack)
1285 const struct got_error *err = NULL;
1287 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1288 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1290 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1291 if (obj->pack_offset >= pack->filesize)
1292 return got_error(GOT_ERR_PACK_OFFSET);
1294 size_t mapoff = (size_t)obj->pack_offset;
1295 err = got_inflate_to_mem_mmap(buf, len, pack->map,
1296 mapoff, pack->filesize - mapoff);
1298 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1299 return got_error_from_errno();
1300 err = got_inflate_to_mem_fd(buf, len, pack->fd);
1303 err = dump_delta_chain_to_mem(buf, len, &obj->deltas, pack);