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"
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_delta_cache.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_parse.h"
46 #include "got_lib_privsep.h"
47 #include "got_lib_pack.h"
50 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
54 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
57 static const struct got_error *
58 verify_fanout_table(uint32_t *fanout_table)
62 for (i = 0; i < 0xff - 1; i++) {
63 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
64 return got_error(GOT_ERR_BAD_PACKIDX);
70 const struct got_error *
71 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
73 const struct got_error *err = NULL;
74 struct got_packidx_v2_hdr *h;
76 uint8_t sha1[SHA1_DIGEST_LENGTH];
77 size_t nobj, len_fanout, len_ids, offset, remain;
87 if (remain < sizeof(*h->magic)) {
88 err = got_error(GOT_ERR_BAD_PACKIDX);
92 h->magic = (uint32_t *)(p->map + offset);
94 h->magic = malloc(sizeof(*h->magic));
95 if (h->magic == NULL) {
96 err = got_error_from_errno("malloc");
99 n = read(p->fd, h->magic, sizeof(*h->magic));
101 err = got_error_from_errno("read");
103 } else if (n != sizeof(*h->magic)) {
104 err = got_error(GOT_ERR_BAD_PACKIDX);
108 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
109 err = got_error(GOT_ERR_BAD_PACKIDX);
112 offset += sizeof(*h->magic);
113 remain -= sizeof(*h->magic);
116 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
118 if (remain < sizeof(*h->version)) {
119 err = got_error(GOT_ERR_BAD_PACKIDX);
123 h->version = (uint32_t *)(p->map + offset);
125 h->version = malloc(sizeof(*h->version));
126 if (h->version == NULL) {
127 err = got_error_from_errno("malloc");
130 n = read(p->fd, h->version, sizeof(*h->version));
132 err = got_error_from_errno("read");
134 } else if (n != sizeof(*h->version)) {
135 err = got_error(GOT_ERR_BAD_PACKIDX);
139 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
140 err = got_error(GOT_ERR_BAD_PACKIDX);
143 offset += sizeof(*h->version);
144 remain -= sizeof(*h->version);
147 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
150 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
151 if (remain < len_fanout) {
152 err = got_error(GOT_ERR_BAD_PACKIDX);
156 h->fanout_table = (uint32_t *)(p->map + offset);
158 h->fanout_table = malloc(len_fanout);
159 if (h->fanout_table == NULL) {
160 err = got_error_from_errno("malloc");
163 n = read(p->fd, h->fanout_table, len_fanout);
165 err = got_error_from_errno("read");
167 } else if (n != len_fanout) {
168 err = got_error(GOT_ERR_BAD_PACKIDX);
172 err = verify_fanout_table(h->fanout_table);
176 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
177 offset += len_fanout;
178 remain -= len_fanout;
180 nobj = be32toh(h->fanout_table[0xff]);
181 len_ids = nobj * sizeof(*h->sorted_ids);
182 if (len_ids <= nobj || len_ids > remain) {
183 err = got_error(GOT_ERR_BAD_PACKIDX);
188 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
190 h->sorted_ids = malloc(len_ids);
191 if (h->sorted_ids == NULL) {
192 err = got_error(GOT_ERR_BAD_PACKIDX);
195 n = read(p->fd, h->sorted_ids, len_ids);
197 err = got_error_from_errno("read");
198 else if (n != len_ids) {
199 err = got_error(GOT_ERR_BAD_PACKIDX);
204 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
208 if (remain < nobj * sizeof(*h->crc32)) {
209 err = got_error(GOT_ERR_BAD_PACKIDX);
213 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
215 h->crc32 = malloc(nobj * sizeof(*h->crc32));
216 if (h->crc32 == NULL) {
217 err = got_error_from_errno("malloc");
220 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
222 err = got_error_from_errno("read");
223 else if (n != nobj * sizeof(*h->crc32)) {
224 err = got_error(GOT_ERR_BAD_PACKIDX);
229 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
230 remain -= nobj * sizeof(*h->crc32);
231 offset += nobj * sizeof(*h->crc32);
233 if (remain < nobj * sizeof(*h->offsets)) {
234 err = got_error(GOT_ERR_BAD_PACKIDX);
238 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
240 h->offsets = malloc(nobj * sizeof(*h->offsets));
241 if (h->offsets == NULL) {
242 err = got_error_from_errno("malloc");
245 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
247 err = got_error_from_errno("read");
248 else if (n != nobj * sizeof(*h->offsets)) {
249 err = got_error(GOT_ERR_BAD_PACKIDX);
254 SHA1Update(&ctx, (uint8_t *)h->offsets,
255 nobj * sizeof(*h->offsets));
256 remain -= nobj * sizeof(*h->offsets);
257 offset += nobj * sizeof(*h->offsets);
259 /* Large file offsets are contained only in files > 2GB. */
260 if (verify || packfile_size > 0x7fffffff) {
261 for (i = 0; i < nobj; i++) {
262 uint32_t o = h->offsets[i];
263 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
267 if (p->nlargeobj == 0)
269 else if (packfile_size <= 0x7fffffff) {
270 err = got_error(GOT_ERR_BAD_PACKIDX);
274 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
275 err = got_error(GOT_ERR_BAD_PACKIDX);
279 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
281 h->large_offsets = malloc(p->nlargeobj *
282 sizeof(*h->large_offsets));
283 if (h->large_offsets == NULL) {
284 err = got_error_from_errno("malloc");
287 n = read(p->fd, h->large_offsets,
288 p->nlargeobj * sizeof(*h->large_offsets));
290 err = got_error_from_errno("read");
291 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
292 err = got_error(GOT_ERR_BAD_PACKIDX);
297 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
298 p->nlargeobj * sizeof(*h->large_offsets));
299 remain -= p->nlargeobj * sizeof(*h->large_offsets);
300 offset += p->nlargeobj * sizeof(*h->large_offsets);
303 if (remain < sizeof(*h->trailer)) {
304 err = got_error(GOT_ERR_BAD_PACKIDX);
309 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
311 h->trailer = malloc(sizeof(*h->trailer));
312 if (h->trailer == NULL) {
313 err = got_error_from_errno("malloc");
316 n = read(p->fd, h->trailer, sizeof(*h->trailer));
318 err = got_error_from_errno("read");
319 else if (n != sizeof(*h->trailer)) {
320 err = got_error(GOT_ERR_BAD_PACKIDX);
325 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
326 SHA1Final(sha1, &ctx);
327 if (memcmp(h->trailer->packidx_sha1, sha1,
328 SHA1_DIGEST_LENGTH) != 0)
329 err = got_error(GOT_ERR_PACKIDX_CSUM);
335 const struct got_error *
336 got_packidx_open(struct got_packidx **packidx,
337 int dir_fd, const char *relpath, int verify)
339 const struct got_error *err = NULL;
340 struct got_packidx *p = NULL;
342 struct stat idx_sb, pack_sb;
346 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
351 * Ensure that a corresponding pack file exists.
352 * Some Git repositories have this problem. Git seems to ignore
353 * the existence of lonely pack index files but we do not.
355 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
356 if (errno == ENOENT) {
357 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
360 err = got_error_from_errno2("fstatat", pack_relpath);
364 p = calloc(1, sizeof(*p));
366 err = got_error_from_errno("calloc");
370 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
372 err = got_error_from_errno2("openat", relpath);
376 if (fstat(p->fd, &idx_sb) != 0) {
377 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);
386 p->path_packidx = strdup(relpath);
387 if (p->path_packidx == NULL) {
388 err = got_error_from_errno("strdup");
392 #ifndef GOT_PACK_NO_MMAP
393 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
394 if (p->map == MAP_FAILED) {
395 if (errno != ENOMEM) {
396 err = got_error_from_errno("mmap");
399 p->map = NULL; /* fall back to read(2) */
403 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
407 got_packidx_close(p);
414 const struct got_error *
415 got_packidx_close(struct got_packidx *packidx)
417 const struct got_error *err = NULL;
419 free(packidx->path_packidx);
421 if (munmap(packidx->map, packidx->len) == -1)
422 err = got_error_from_errno("munmap");
424 free(packidx->hdr.magic);
425 free(packidx->hdr.version);
426 free(packidx->hdr.fanout_table);
427 free(packidx->hdr.sorted_ids);
428 free(packidx->hdr.crc32);
429 free(packidx->hdr.offsets);
430 free(packidx->hdr.large_offsets);
431 free(packidx->hdr.trailer);
433 if (close(packidx->fd) == -1 && err == NULL)
434 err = got_error_from_errno("close");
435 free(packidx->sorted_offsets);
436 free(packidx->sorted_large_offsets);
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);
513 offset_cmp(const void *pa, const void *pb)
515 const struct got_pack_offset_index *a, *b;
517 a = (const struct got_pack_offset_index *)pa;
518 b = (const struct got_pack_offset_index *)pb;
520 if (a->offset < b->offset)
522 else if (a->offset > b->offset)
529 large_offset_cmp(const void *pa, const void *pb)
531 const struct got_pack_large_offset_index *a, *b;
533 a = (const struct got_pack_large_offset_index *)pa;
534 b = (const struct got_pack_large_offset_index *)pb;
536 if (a->offset < b->offset)
538 else if (a->offset > b->offset)
544 static const struct got_error *
545 build_offset_index(struct got_packidx *p)
547 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
548 unsigned int i, j, k;
550 p->sorted_offsets = calloc(nobj - p->nlargeobj,
551 sizeof(p->sorted_offsets[0]));
552 if (p->sorted_offsets == NULL)
553 return got_error_from_errno("calloc");
555 if (p->nlargeobj > 0) {
556 p->sorted_large_offsets = calloc(p->nlargeobj,
557 sizeof(p->sorted_large_offsets[0]));
558 if (p->sorted_large_offsets == NULL)
559 return got_error_from_errno("calloc");
564 for (i = 0; i < nobj; i++) {
565 uint32_t offset = be32toh(p->hdr.offsets[i]);
566 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
569 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
570 if (idx >= p->nlargeobj ||
572 p->hdr.large_offsets == NULL)
573 return got_error(GOT_ERR_BAD_PACKIDX);
574 loffset = be64toh(p->hdr.large_offsets[idx]);
575 p->sorted_large_offsets[j].offset = loffset;
576 p->sorted_large_offsets[j].idx = i;
579 p->sorted_offsets[k].offset = offset;
580 p->sorted_offsets[k].idx = i;
584 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
585 return got_error(GOT_ERR_BAD_PACKIDX);
587 qsort(p->sorted_offsets, nobj - p->nlargeobj,
588 sizeof(p->sorted_offsets[0]), offset_cmp);
590 if (p->sorted_large_offsets)
591 qsort(p->sorted_large_offsets, p->nlargeobj,
592 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
597 const struct got_error *
598 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
600 const struct got_error *err;
601 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
606 if (packidx->sorted_offsets == NULL) {
607 err = build_offset_index(packidx);
612 if (offset >= 0x7fffffff) {
614 left = 0, right = packidx->nlargeobj - 1;
615 while (left <= right) {
616 i = ((left + right) / 2);
617 lo = packidx->sorted_large_offsets[i].offset;
619 *idx = packidx->sorted_large_offsets[i].idx;
621 } else if (offset > lo)
623 else if (offset < lo)
628 left = 0, right = totobj - packidx->nlargeobj - 1;
629 while (left <= right) {
630 i = ((left + right) / 2);
631 o = packidx->sorted_offsets[i].offset;
633 *idx = packidx->sorted_offsets[i].idx;
635 } else if (offset > o)
645 const struct got_error *
646 got_packidx_get_object_id(struct got_object_id *id,
647 struct got_packidx *packidx, int idx)
649 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
650 struct got_packidx_object_id *oid;
652 if (idx < 0 || idx >= totobj)
653 return got_error(GOT_ERR_NO_OBJ);
655 oid = &packidx->hdr.sorted_ids[idx];
656 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
660 const struct got_error *
661 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
662 struct got_packidx *packidx, const char *id_str_prefix)
664 const struct got_error *err = NULL;
666 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
668 size_t prefix_len = strlen(id_str_prefix);
669 struct got_packidx_object_id *oid;
672 STAILQ_INIT(matched_ids);
675 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
677 hex[0] = id_str_prefix[0];
678 hex[1] = id_str_prefix[1];
680 if (!got_parse_xdigit(&id0, hex))
681 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
684 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
685 oid = &packidx->hdr.sorted_ids[i];
686 while (i < totobj && oid->sha1[0] == id0) {
687 char id_str[SHA1_DIGEST_STRING_LENGTH];
688 struct got_object_qid *qid;
691 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
692 return got_error(GOT_ERR_NO_SPACE);
694 cmp = strncmp(id_str, id_str_prefix, prefix_len);
696 oid = &packidx->hdr.sorted_ids[++i];
701 err = got_object_qid_alloc_partial(&qid);
704 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
705 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
707 oid = &packidx->hdr.sorted_ids[++i];
711 got_object_id_queue_free(matched_ids);
715 static const struct got_error *
716 pack_stop_privsep_child(struct got_pack *pack)
718 const struct got_error *err = NULL;
720 if (pack->privsep_child == NULL)
723 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
726 err = got_privsep_wait_for_child(pack->privsep_child->pid);
727 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
728 err = got_error_from_errno("close");
729 free(pack->privsep_child->ibuf);
730 free(pack->privsep_child);
731 pack->privsep_child = NULL;
735 const struct got_error *
736 got_pack_close(struct got_pack *pack)
738 const struct got_error *err = NULL;
740 err = pack_stop_privsep_child(pack);
741 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
742 err = got_error_from_errno("munmap");
743 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
744 err = got_error_from_errno("close");
746 free(pack->path_packfile);
747 pack->path_packfile = NULL;
749 if (pack->delta_cache) {
750 got_delta_cache_free(pack->delta_cache);
751 pack->delta_cache = NULL;
755 * Leave accumfd and basefd alone. They are managed by the
756 * repository layer and can be reused.
762 const struct got_error *
763 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
764 struct got_pack *pack, off_t offset)
774 if (offset >= pack->filesize)
775 return got_error(GOT_ERR_PACK_OFFSET);
778 mapoff = (size_t)offset;
780 if (lseek(pack->fd, offset, SEEK_SET) == -1)
781 return got_error_from_errno("lseek");
785 /* We do not support size values which don't fit in 64 bit. */
787 return got_error(GOT_ERR_NO_SPACE);
790 if (mapoff + sizeof(sizeN) >= pack->filesize)
791 return got_error(GOT_ERR_BAD_PACKFILE);
792 sizeN = *(pack->map + mapoff);
793 mapoff += sizeof(sizeN);
795 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
797 return got_error_from_errno("read");
798 if (n != sizeof(sizeN))
799 return got_error(GOT_ERR_BAD_PACKFILE);
801 *len += sizeof(sizeN);
804 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
805 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
806 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
808 size_t shift = 4 + 7 * (i - 1);
809 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
812 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
819 static const struct got_error *
820 open_plain_object(struct got_object **obj, struct got_object_id *id,
821 uint8_t type, off_t offset, size_t size, int idx)
823 *obj = calloc(1, sizeof(**obj));
825 return got_error_from_errno("calloc");
828 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
829 (*obj)->pack_idx = idx;
832 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
833 (*obj)->pack_offset = offset;
838 static const struct got_error *
839 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
850 /* We do not support offset values which don't fit in 64 bit. */
852 return got_error(GOT_ERR_NO_SPACE);
856 mapoff = (size_t)delta_offset + *len;
857 if (mapoff + sizeof(offN) >= pack->filesize)
858 return got_error(GOT_ERR_PACK_OFFSET);
859 offN = *(pack->map + mapoff);
862 n = read(pack->fd, &offN, sizeof(offN));
864 return got_error_from_errno("read");
865 if (n != sizeof(offN))
866 return got_error(GOT_ERR_BAD_PACKFILE);
868 *len += sizeof(offN);
871 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
875 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
878 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
884 const struct got_error *
885 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
886 struct got_pack *pack, off_t offset, int tslen)
888 const struct got_error *err;
894 err = parse_negative_offset(&negoffset, &negofflen, pack,
899 /* Compute the base object's offset (must be in the same pack file). */
900 *base_offset = (offset - negoffset);
901 if (*base_offset <= 0)
902 return got_error(GOT_ERR_BAD_PACKFILE);
908 static const struct got_error *
909 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
910 size_t *delta_compressed_len, size_t delta_data_offset,
911 struct got_pack *pack)
913 const struct got_error *err = NULL;
917 if (delta_data_offset >= pack->filesize)
918 return got_error(GOT_ERR_PACK_OFFSET);
919 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
920 &consumed, NULL, pack->map, delta_data_offset,
921 pack->filesize - delta_data_offset);
925 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
926 return got_error_from_errno("lseek");
927 err = got_inflate_to_mem_fd(delta_buf, delta_len,
928 &consumed, NULL, 0, pack->fd);
933 if (delta_compressed_len)
934 *delta_compressed_len = consumed;
939 static const struct got_error *
940 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
941 int delta_type, size_t delta_size, size_t delta_data_offset)
943 struct got_delta *delta;
945 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
948 return got_error_from_errno("got_delta_open");
949 /* delta is freed in got_object_close() */
951 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
955 static const struct got_error *
956 resolve_offset_delta(struct got_delta_chain *deltas,
957 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
958 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
961 const struct got_error *err;
966 off_t delta_data_offset;
969 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
970 delta_offset, tslen);
974 delta_data_offset = delta_offset + tslen + consumed;
975 if (delta_data_offset >= pack->filesize)
976 return got_error(GOT_ERR_PACK_OFFSET);
978 if (pack->map == NULL) {
979 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
980 if (delta_data_offset == -1)
981 return got_error_from_errno("lseek");
984 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
989 /* An offset delta must be in the same packfile. */
990 if (base_offset >= pack->filesize)
991 return got_error(GOT_ERR_PACK_OFFSET);
993 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
994 &base_tslen, pack, base_offset);
998 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
999 base_tslen, base_type, base_size, recursion - 1);
1002 const struct got_error *
1003 got_pack_parse_ref_delta(struct got_object_id *id,
1004 struct got_pack *pack, off_t delta_offset, int tslen)
1007 size_t mapoff = delta_offset + tslen;
1008 if (mapoff + sizeof(*id) >= pack->filesize)
1009 return got_error(GOT_ERR_PACK_OFFSET);
1010 memcpy(id, pack->map + mapoff, sizeof(*id));
1013 n = read(pack->fd, id, sizeof(*id));
1015 return got_error_from_errno("read");
1016 if (n != sizeof(*id))
1017 return got_error(GOT_ERR_BAD_PACKFILE);
1023 static const struct got_error *
1024 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1025 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1026 size_t delta_size, unsigned int recursion)
1028 const struct got_error *err;
1029 struct got_object_id id;
1035 off_t delta_data_offset;
1037 if (delta_offset + tslen >= pack->filesize)
1038 return got_error(GOT_ERR_PACK_OFFSET);
1040 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1044 delta_data_offset = delta_offset + tslen + sizeof(id);
1046 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1047 if (delta_data_offset == -1)
1048 return got_error_from_errno("lseek");
1051 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1056 /* Delta base must be in the same pack file. */
1057 idx = got_packidx_get_object_idx(packidx, &id);
1059 return got_error(GOT_ERR_NO_OBJ);
1061 base_offset = got_packidx_get_object_offset(packidx, idx);
1062 if (base_offset == (uint64_t)-1)
1063 return got_error(GOT_ERR_BAD_PACKIDX);
1065 if (base_offset >= pack->filesize)
1066 return got_error(GOT_ERR_PACK_OFFSET);
1068 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1069 &base_tslen, pack, base_offset);
1073 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1074 base_tslen, base_type, base_size, recursion - 1);
1077 const struct got_error *
1078 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1079 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1080 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1082 const struct got_error *err = NULL;
1084 if (--recursion == 0)
1085 return got_error(GOT_ERR_RECURSION);
1087 switch (delta_type) {
1088 case GOT_OBJ_TYPE_COMMIT:
1089 case GOT_OBJ_TYPE_TREE:
1090 case GOT_OBJ_TYPE_BLOB:
1091 case GOT_OBJ_TYPE_TAG:
1092 /* Plain types are the final delta base. Recursion ends. */
1093 err = add_delta(deltas, delta_offset, tslen, delta_type,
1096 case GOT_OBJ_TYPE_OFFSET_DELTA:
1097 err = resolve_offset_delta(deltas, packidx, pack,
1098 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1100 case GOT_OBJ_TYPE_REF_DELTA:
1101 err = resolve_ref_delta(deltas, packidx, pack,
1102 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1105 return got_error(GOT_ERR_OBJ_TYPE);
1111 static const struct got_error *
1112 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1113 struct got_pack *pack, struct got_object_id *id, off_t offset,
1114 size_t tslen, int delta_type, size_t delta_size, int idx)
1116 const struct got_error *err = NULL;
1119 *obj = calloc(1, sizeof(**obj));
1121 return got_error_from_errno("calloc");
1125 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1126 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1127 (*obj)->pack_offset = offset + tslen;
1129 STAILQ_INIT(&(*obj)->deltas.entries);
1130 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1131 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1132 (*obj)->pack_idx = idx;
1134 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1135 offset, tslen, delta_type, delta_size,
1136 GOT_DELTA_CHAIN_RECURSION_MAX);
1140 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1143 (*obj)->type = resolved_type;
1146 got_object_close(*obj);
1152 const struct got_error *
1153 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1154 struct got_packidx *packidx, int idx, struct got_object_id *id)
1156 const struct got_error *err = NULL;
1164 offset = got_packidx_get_object_offset(packidx, idx);
1165 if (offset == (uint64_t)-1)
1166 return got_error(GOT_ERR_BAD_PACKIDX);
1168 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1174 case GOT_OBJ_TYPE_COMMIT:
1175 case GOT_OBJ_TYPE_TREE:
1176 case GOT_OBJ_TYPE_BLOB:
1177 case GOT_OBJ_TYPE_TAG:
1178 err = open_plain_object(obj, id, type, offset + tslen,
1181 case GOT_OBJ_TYPE_OFFSET_DELTA:
1182 case GOT_OBJ_TYPE_REF_DELTA:
1183 err = open_delta_object(obj, packidx, pack, id, offset,
1184 tslen, type, size, idx);
1187 err = got_error(GOT_ERR_OBJ_TYPE);
1194 const struct got_error *
1195 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1196 struct got_delta_chain *deltas, struct got_pack *pack)
1198 struct got_delta *delta;
1199 uint64_t base_size = 0, result_size = 0;
1202 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1203 /* Plain object types are the delta base. */
1204 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1205 delta->type != GOT_OBJ_TYPE_TREE &&
1206 delta->type != GOT_OBJ_TYPE_BLOB &&
1207 delta->type != GOT_OBJ_TYPE_TAG) {
1208 const struct got_error *err;
1213 got_delta_cache_get(&delta_buf, &delta_len,
1214 pack->delta_cache, delta->data_offset);
1215 if (delta_buf == NULL) {
1217 err = read_delta_data(&delta_buf, &delta_len,
1218 NULL, delta->data_offset, pack);
1221 err = got_delta_cache_add(pack->delta_cache,
1222 delta->data_offset, delta_buf, delta_len);
1225 else if (err->code != GOT_ERR_NO_SPACE) {
1230 err = got_delta_get_sizes(&base_size, &result_size,
1231 delta_buf, delta_len);
1237 base_size = delta->size;
1238 if (base_size > *max_size)
1239 *max_size = base_size;
1240 if (result_size > *max_size)
1241 *max_size = result_size;
1247 const struct got_error *
1248 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1249 struct got_pack *pack)
1251 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1252 return got_error(GOT_ERR_OBJ_TYPE);
1254 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1257 const struct got_error *
1258 got_pack_dump_delta_chain_to_file(size_t *result_size,
1259 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1260 FILE *base_file, FILE *accum_file)
1262 const struct got_error *err = NULL;
1263 struct got_delta *delta;
1264 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1265 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1266 /* We process small enough files entirely in memory for speed. */
1267 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1268 uint64_t max_size = 0;
1273 if (STAILQ_EMPTY(&deltas->entries))
1274 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1276 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1277 return got_error_from_errno("fseeko");
1278 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1279 return got_error_from_errno("fseeko");
1281 /* Deltas are ordered in ascending order. */
1282 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1283 uint64_t base_size, result_size = 0;
1287 off_t delta_data_offset;
1289 /* Plain object types are the delta base. */
1290 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1291 delta->type != GOT_OBJ_TYPE_TREE &&
1292 delta->type != GOT_OBJ_TYPE_BLOB &&
1293 delta->type != GOT_OBJ_TYPE_TAG) {
1294 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1298 delta_data_offset = delta->offset + delta->tslen;
1299 if (delta_data_offset >= pack->filesize) {
1300 err = got_error(GOT_ERR_PACK_OFFSET);
1303 if (pack->map == NULL) {
1304 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1306 err = got_error_from_errno("lseek");
1310 if (delta->size > max_size)
1311 max_size = delta->size;
1312 if (max_size > max_bufsize) {
1314 mapoff = (size_t)delta_data_offset;
1315 err = got_inflate_to_file_mmap(
1316 &base_bufsz, NULL, NULL, pack->map,
1317 mapoff, pack->filesize - mapoff,
1320 err = got_inflate_to_file_fd(
1321 &base_bufsz, NULL, NULL, pack->fd,
1324 accum_buf = malloc(max_size);
1325 if (accum_buf == NULL) {
1326 err = got_error_from_errno("malloc");
1329 accum_bufsz = max_size;
1331 mapoff = (size_t)delta_data_offset;
1332 err = got_inflate_to_mem_mmap(&base_buf,
1333 &base_bufsz, NULL, NULL,
1335 pack->filesize - mapoff);
1337 err = got_inflate_to_mem_fd(&base_buf,
1338 &base_bufsz, NULL, NULL, max_size,
1344 if (base_buf == NULL)
1349 got_delta_cache_get(&delta_buf, &delta_len,
1350 pack->delta_cache, delta->data_offset);
1351 if (delta_buf == NULL) {
1353 err = read_delta_data(&delta_buf, &delta_len, NULL,
1354 delta->data_offset, pack);
1357 err = got_delta_cache_add(pack->delta_cache,
1358 delta->data_offset, delta_buf, delta_len);
1361 else if (err->code != GOT_ERR_NO_SPACE) {
1367 err = got_delta_get_sizes(&base_size, &result_size,
1368 delta_buf, delta_len);
1371 if (base_size > max_size)
1372 max_size = base_size;
1373 if (result_size > max_size)
1374 max_size = result_size;
1376 if (base_buf && max_size > max_bufsize) {
1377 /* Switch from buffers to temporary files. */
1378 size_t w = fwrite(base_buf, 1, base_bufsz,
1380 if (w != base_bufsz) {
1381 err = got_ferror(outfile, GOT_ERR_IO);
1390 if (base_buf && max_size > base_bufsz) {
1391 uint8_t *p = realloc(base_buf, max_size);
1393 err = got_error_from_errno("realloc");
1397 base_bufsz = max_size;
1400 if (accum_buf && max_size > accum_bufsz) {
1401 uint8_t *p = realloc(accum_buf, max_size);
1403 err = got_error_from_errno("realloc");
1407 accum_bufsz = max_size;
1411 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1412 delta_buf, delta_len, accum_buf,
1413 &accum_size, max_size);
1416 err = got_delta_apply(base_file, delta_buf,
1418 /* Final delta application writes to output file. */
1419 ++n < deltas->nentries ? accum_file : outfile,
1427 if (n < deltas->nentries) {
1428 /* Accumulated delta becomes the new base. */
1430 uint8_t *tmp = accum_buf;
1431 size_t tmp_size = accum_bufsz;
1432 accum_buf = base_buf;
1433 accum_bufsz = base_bufsz;
1435 base_bufsz = tmp_size;
1437 FILE *tmp = accum_file;
1438 accum_file = base_file;
1449 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1451 if (len != accum_size)
1452 err = got_ferror(outfile, GOT_ERR_IO);
1456 *result_size = accum_size;
1460 const struct got_error *
1461 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1462 struct got_delta_chain *deltas, struct got_pack *pack)
1464 const struct got_error *err = NULL;
1465 struct got_delta *delta;
1466 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1467 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1468 uint64_t max_size = 0;
1474 if (STAILQ_EMPTY(&deltas->entries))
1475 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1477 /* Deltas are ordered in ascending order. */
1478 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1479 uint64_t base_size, result_size = 0;
1482 size_t delta_data_offset;
1484 /* Plain object types are the delta base. */
1485 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1486 delta->type != GOT_OBJ_TYPE_TREE &&
1487 delta->type != GOT_OBJ_TYPE_BLOB &&
1488 delta->type != GOT_OBJ_TYPE_TAG) {
1489 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1493 delta_data_offset = delta->offset + delta->tslen;
1494 if (delta_data_offset >= pack->filesize) {
1495 err = got_error(GOT_ERR_PACK_OFFSET);
1499 if (delta->size > max_size)
1500 max_size = delta->size;
1503 size_t mapoff = (size_t)delta_data_offset;
1504 err = got_inflate_to_mem_mmap(&base_buf,
1505 &base_bufsz, NULL, NULL, pack->map,
1506 mapoff, pack->filesize - mapoff);
1508 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1510 err = got_error_from_errno("lseek");
1513 err = got_inflate_to_mem_fd(&base_buf,
1514 &base_bufsz, NULL, NULL, max_size,
1523 got_delta_cache_get(&delta_buf, &delta_len,
1524 pack->delta_cache, delta->data_offset);
1525 if (delta_buf == NULL) {
1527 err = read_delta_data(&delta_buf, &delta_len, NULL,
1528 delta->data_offset, pack);
1531 err = got_delta_cache_add(pack->delta_cache,
1532 delta->data_offset, delta_buf, delta_len);
1535 else if (err->code != GOT_ERR_NO_SPACE) {
1541 err = got_delta_get_sizes(&base_size, &result_size,
1542 delta_buf, delta_len);
1545 if (base_size > max_size)
1546 max_size = base_size;
1547 if (result_size > max_size)
1548 max_size = result_size;
1550 if (max_size > base_bufsz) {
1551 uint8_t *p = realloc(base_buf, max_size);
1553 err = got_error_from_errno("realloc");
1557 base_bufsz = max_size;
1560 if (max_size > accum_bufsz) {
1561 uint8_t *p = realloc(accum_buf, max_size);
1563 err = got_error_from_errno("realloc");
1567 accum_bufsz = max_size;
1570 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1571 delta_buf, delta_len, accum_buf,
1572 &accum_size, max_size);
1579 if (n < deltas->nentries) {
1580 /* Accumulated delta becomes the new base. */
1581 uint8_t *tmp = accum_buf;
1582 size_t tmp_size = accum_bufsz;
1583 accum_buf = base_buf;
1584 accum_bufsz = base_bufsz;
1586 base_bufsz = tmp_size;
1597 *outbuf = accum_buf;
1598 *outlen = accum_size;
1603 const struct got_error *
1604 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1605 FILE *outfile, FILE *base_file, FILE *accum_file)
1607 const struct got_error *err = NULL;
1609 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1610 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1612 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1613 if (obj->pack_offset >= pack->filesize)
1614 return got_error(GOT_ERR_PACK_OFFSET);
1617 size_t mapoff = (size_t)obj->pack_offset;
1618 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1619 pack->map, mapoff, pack->filesize - mapoff,
1622 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1623 return got_error_from_errno("lseek");
1624 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1628 err = got_pack_dump_delta_chain_to_file(&obj->size,
1629 &obj->deltas, pack, outfile, base_file, accum_file);
1634 const struct got_error *
1635 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1636 struct got_object *obj, struct got_pack *pack)
1638 const struct got_error *err = NULL;
1640 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1641 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1643 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1644 if (obj->pack_offset >= pack->filesize)
1645 return got_error(GOT_ERR_PACK_OFFSET);
1647 size_t mapoff = (size_t)obj->pack_offset;
1648 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1649 pack->map, mapoff, pack->filesize - mapoff);
1651 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1652 return got_error_from_errno("lseek");
1653 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1654 obj->size, pack->fd);
1657 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1663 static const struct got_error *
1664 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1665 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1666 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1668 const struct got_error *err = NULL;
1670 /* Validate decompression and obtain the decompressed size. */
1671 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1672 delta_data_offset, pack);
1676 /* Read delta base/result sizes from head of delta stream. */
1677 err = got_delta_get_sizes(base_size, result_size,
1678 *delta_buf, *delta_len);
1682 /* Discard decompressed delta and read it again in compressed form. */
1684 *delta_buf = malloc(*delta_len_compressed);
1685 if (*delta_buf == NULL) {
1686 err = got_error_from_errno("malloc");
1690 if (delta_data_offset >= pack->filesize)
1691 err = got_error(GOT_ERR_PACK_OFFSET);
1692 memcpy(*delta_buf, pack->map + delta_data_offset,
1693 *delta_len_compressed);
1696 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1697 err = got_error_from_errno("lseek");
1700 n = read(pack->fd, *delta_buf, *delta_len_compressed);
1702 err = got_error_from_errno("read");
1704 } else if (n != *delta_len_compressed) {
1705 err = got_error(GOT_ERR_IO);
1714 *delta_len_compressed = 0;
1721 const struct got_error *
1722 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1723 size_t *delta_compressed_size, off_t *delta_offset, off_t *base_offset,
1724 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1725 struct got_pack *pack, struct got_packidx *packidx, int idx)
1727 const struct got_error *err = NULL;
1731 size_t tslen, delta_hdrlen;
1732 off_t delta_data_offset;
1736 *delta_compressed_size = 0;
1742 offset = got_packidx_get_object_offset(packidx, idx);
1743 if (offset == (uint64_t)-1)
1744 return got_error(GOT_ERR_BAD_PACKIDX);
1746 if (offset >= pack->filesize)
1747 return got_error(GOT_ERR_PACK_OFFSET);
1749 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1754 if (tslen + size < tslen || offset + size < size ||
1755 tslen + offset < tslen)
1756 return got_error(GOT_ERR_PACK_OFFSET);
1759 case GOT_OBJ_TYPE_OFFSET_DELTA:
1760 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1761 pack, offset, tslen);
1765 case GOT_OBJ_TYPE_REF_DELTA:
1766 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1769 delta_hdrlen = SHA1_DIGEST_LENGTH;
1772 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1773 "non-delta object type %d found at offset %llu",
1777 if (tslen + delta_hdrlen < delta_hdrlen ||
1778 offset + delta_hdrlen < delta_hdrlen)
1779 return got_error(GOT_ERR_BAD_DELTA);
1781 delta_data_offset = offset + tslen + delta_hdrlen;
1782 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1783 base_size, result_size, delta_data_offset, pack, packidx);
1787 if (*delta_size != size) {
1788 err = got_error(GOT_ERR_BAD_DELTA);
1792 *delta_offset = offset;
1798 *delta_compressed_size = 0;