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>
22 #include <sys/resource.h>
23 #include <sys/socket.h>
38 #include "got_error.h"
39 #include "got_object.h"
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_delta_cache.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
52 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
56 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
59 static const struct got_error *
60 verify_fanout_table(uint32_t *fanout_table)
64 for (i = 0; i < 0xff - 1; i++) {
65 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
66 return got_error(GOT_ERR_BAD_PACKIDX);
72 const struct got_error *
73 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
75 const struct got_error *err = NULL;
76 struct got_packidx_v2_hdr *h;
78 uint8_t sha1[SHA1_DIGEST_LENGTH];
79 size_t nobj, len_fanout, len_ids, offset, remain;
89 if (remain < sizeof(*h->magic)) {
90 err = got_error(GOT_ERR_BAD_PACKIDX);
94 h->magic = (uint32_t *)(p->map + offset);
96 h->magic = malloc(sizeof(*h->magic));
97 if (h->magic == NULL) {
98 err = got_error_from_errno("malloc");
101 n = read(p->fd, h->magic, sizeof(*h->magic));
103 err = got_error_from_errno("read");
105 } else if (n != sizeof(*h->magic)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
110 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
111 err = got_error(GOT_ERR_BAD_PACKIDX);
114 offset += sizeof(*h->magic);
115 remain -= sizeof(*h->magic);
118 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
120 if (remain < sizeof(*h->version)) {
121 err = got_error(GOT_ERR_BAD_PACKIDX);
125 h->version = (uint32_t *)(p->map + offset);
127 h->version = malloc(sizeof(*h->version));
128 if (h->version == NULL) {
129 err = got_error_from_errno("malloc");
132 n = read(p->fd, h->version, sizeof(*h->version));
134 err = got_error_from_errno("read");
136 } else if (n != sizeof(*h->version)) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
141 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
142 err = got_error(GOT_ERR_BAD_PACKIDX);
145 offset += sizeof(*h->version);
146 remain -= sizeof(*h->version);
149 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
152 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
153 if (remain < len_fanout) {
154 err = got_error(GOT_ERR_BAD_PACKIDX);
158 h->fanout_table = (uint32_t *)(p->map + offset);
160 h->fanout_table = malloc(len_fanout);
161 if (h->fanout_table == NULL) {
162 err = got_error_from_errno("malloc");
165 n = read(p->fd, h->fanout_table, len_fanout);
167 err = got_error_from_errno("read");
169 } else if (n != len_fanout) {
170 err = got_error(GOT_ERR_BAD_PACKIDX);
174 err = verify_fanout_table(h->fanout_table);
178 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
179 offset += len_fanout;
180 remain -= len_fanout;
182 nobj = be32toh(h->fanout_table[0xff]);
183 len_ids = nobj * sizeof(*h->sorted_ids);
184 if (len_ids <= nobj || len_ids > remain) {
185 err = got_error(GOT_ERR_BAD_PACKIDX);
190 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
192 h->sorted_ids = malloc(len_ids);
193 if (h->sorted_ids == NULL) {
194 err = got_error(GOT_ERR_BAD_PACKIDX);
197 n = read(p->fd, h->sorted_ids, len_ids);
199 err = got_error_from_errno("read");
200 else if (n != len_ids) {
201 err = got_error(GOT_ERR_BAD_PACKIDX);
206 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
210 if (remain < nobj * sizeof(*h->crc32)) {
211 err = got_error(GOT_ERR_BAD_PACKIDX);
215 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
217 h->crc32 = malloc(nobj * sizeof(*h->crc32));
218 if (h->crc32 == NULL) {
219 err = got_error_from_errno("malloc");
222 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
224 err = got_error_from_errno("read");
225 else if (n != nobj * sizeof(*h->crc32)) {
226 err = got_error(GOT_ERR_BAD_PACKIDX);
231 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
232 remain -= nobj * sizeof(*h->crc32);
233 offset += nobj * sizeof(*h->crc32);
235 if (remain < nobj * sizeof(*h->offsets)) {
236 err = got_error(GOT_ERR_BAD_PACKIDX);
240 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
242 h->offsets = malloc(nobj * sizeof(*h->offsets));
243 if (h->offsets == NULL) {
244 err = got_error_from_errno("malloc");
247 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
249 err = got_error_from_errno("read");
250 else if (n != nobj * sizeof(*h->offsets)) {
251 err = got_error(GOT_ERR_BAD_PACKIDX);
256 SHA1Update(&ctx, (uint8_t *)h->offsets,
257 nobj * sizeof(*h->offsets));
258 remain -= nobj * sizeof(*h->offsets);
259 offset += nobj * sizeof(*h->offsets);
261 /* Large file offsets are contained only in files > 2GB. */
262 if (verify || packfile_size > 0x7fffffff) {
263 for (i = 0; i < nobj; i++) {
264 uint32_t o = h->offsets[i];
265 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
269 if (p->nlargeobj == 0)
271 else if (packfile_size <= 0x7fffffff) {
272 err = got_error(GOT_ERR_BAD_PACKIDX);
276 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
277 err = got_error(GOT_ERR_BAD_PACKIDX);
281 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
283 h->large_offsets = malloc(p->nlargeobj *
284 sizeof(*h->large_offsets));
285 if (h->large_offsets == NULL) {
286 err = got_error_from_errno("malloc");
289 n = read(p->fd, h->large_offsets,
290 p->nlargeobj * sizeof(*h->large_offsets));
292 err = got_error_from_errno("read");
293 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
294 err = got_error(GOT_ERR_BAD_PACKIDX);
299 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
300 p->nlargeobj * sizeof(*h->large_offsets));
301 remain -= p->nlargeobj * sizeof(*h->large_offsets);
302 offset += p->nlargeobj * sizeof(*h->large_offsets);
305 if (remain < sizeof(*h->trailer)) {
306 err = got_error(GOT_ERR_BAD_PACKIDX);
311 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
313 h->trailer = malloc(sizeof(*h->trailer));
314 if (h->trailer == NULL) {
315 err = got_error_from_errno("malloc");
318 n = read(p->fd, h->trailer, sizeof(*h->trailer));
320 err = got_error_from_errno("read");
321 else if (n != sizeof(*h->trailer)) {
322 err = got_error(GOT_ERR_BAD_PACKIDX);
327 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
328 SHA1Final(sha1, &ctx);
329 if (memcmp(h->trailer->packidx_sha1, sha1,
330 SHA1_DIGEST_LENGTH) != 0)
331 err = got_error(GOT_ERR_PACKIDX_CSUM);
337 const struct got_error *
338 got_packidx_open(struct got_packidx **packidx,
339 int dir_fd, const char *relpath, int verify)
341 const struct got_error *err = NULL;
342 struct got_packidx *p = NULL;
344 struct stat idx_sb, pack_sb;
348 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
353 * Ensure that a corresponding pack file exists.
354 * Some Git repositories have this problem. Git seems to ignore
355 * the existence of lonely pack index files but we do not.
357 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
358 if (errno == ENOENT) {
359 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
362 err = got_error_from_errno2("fstatat", pack_relpath);
366 p = calloc(1, sizeof(*p));
368 err = got_error_from_errno("calloc");
372 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
374 err = got_error_from_errno2("openat", relpath);
378 if (fstat(p->fd, &idx_sb) != 0) {
379 err = got_error_from_errno2("fstat", relpath);
382 p->len = idx_sb.st_size;
383 if (p->len < sizeof(p->hdr)) {
384 err = got_error(GOT_ERR_BAD_PACKIDX);
388 p->path_packidx = strdup(relpath);
389 if (p->path_packidx == NULL) {
390 err = got_error_from_errno("strdup");
394 #ifndef GOT_PACK_NO_MMAP
395 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
396 if (p->map == MAP_FAILED) {
397 if (errno != ENOMEM) {
398 err = got_error_from_errno("mmap");
401 p->map = NULL; /* fall back to read(2) */
405 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
409 got_packidx_close(p);
416 const struct got_error *
417 got_packidx_close(struct got_packidx *packidx)
419 const struct got_error *err = NULL;
421 free(packidx->path_packidx);
423 if (munmap(packidx->map, packidx->len) == -1)
424 err = got_error_from_errno("munmap");
426 free(packidx->hdr.magic);
427 free(packidx->hdr.version);
428 free(packidx->hdr.fanout_table);
429 free(packidx->hdr.sorted_ids);
430 free(packidx->hdr.crc32);
431 free(packidx->hdr.offsets);
432 free(packidx->hdr.large_offsets);
433 free(packidx->hdr.trailer);
435 if (close(packidx->fd) == -1 && err == NULL)
436 err = got_error_from_errno("close");
437 free(packidx->sorted_offsets);
438 free(packidx->sorted_large_offsets);
444 const struct got_error *
445 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
449 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
450 size = strlen(path_packidx) + 2;
451 if (size < GOT_PACKFILE_NAMELEN + 1)
452 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
454 *path_packfile = malloc(size);
455 if (*path_packfile == NULL)
456 return got_error_from_errno("malloc");
458 /* Copy up to and excluding ".idx". */
459 if (strlcpy(*path_packfile, path_packidx,
460 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
461 return got_error(GOT_ERR_NO_SPACE);
463 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
464 return got_error(GOT_ERR_NO_SPACE);
470 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
472 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
473 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
475 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
476 if (idx < 0 || idx >= packidx->nlargeobj ||
477 packidx->hdr.large_offsets == NULL)
479 loffset = be64toh(packidx->hdr.large_offsets[idx]);
480 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
482 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
486 got_packidx_get_object_idx(struct got_packidx *packidx,
487 struct got_object_id *id)
489 u_int8_t id0 = id->sha1[0];
490 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
491 int left = 0, right = totobj - 1;
494 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
496 while (left <= right) {
497 struct got_packidx_object_id *oid;
500 i = ((left + right) / 2);
501 oid = &packidx->hdr.sorted_ids[i];
502 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
515 offset_cmp(const void *pa, const void *pb)
517 const struct got_pack_offset_index *a, *b;
519 a = (const struct got_pack_offset_index *)pa;
520 b = (const struct got_pack_offset_index *)pb;
522 if (a->offset < b->offset)
524 else if (a->offset > b->offset)
531 large_offset_cmp(const void *pa, const void *pb)
533 const struct got_pack_large_offset_index *a, *b;
535 a = (const struct got_pack_large_offset_index *)pa;
536 b = (const struct got_pack_large_offset_index *)pb;
538 if (a->offset < b->offset)
540 else if (a->offset > b->offset)
546 static const struct got_error *
547 build_offset_index(struct got_packidx *p)
549 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
550 unsigned int i, j, k;
552 p->sorted_offsets = calloc(nobj - p->nlargeobj,
553 sizeof(p->sorted_offsets[0]));
554 if (p->sorted_offsets == NULL)
555 return got_error_from_errno("calloc");
557 if (p->nlargeobj > 0) {
558 p->sorted_large_offsets = calloc(p->nlargeobj,
559 sizeof(p->sorted_large_offsets[0]));
560 if (p->sorted_large_offsets == NULL)
561 return got_error_from_errno("calloc");
566 for (i = 0; i < nobj; i++) {
567 uint32_t offset = be32toh(p->hdr.offsets[i]);
568 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
571 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
572 if (idx >= p->nlargeobj ||
574 p->hdr.large_offsets == NULL)
575 return got_error(GOT_ERR_BAD_PACKIDX);
576 loffset = be64toh(p->hdr.large_offsets[idx]);
577 p->sorted_large_offsets[j].offset = loffset;
578 p->sorted_large_offsets[j].idx = i;
581 p->sorted_offsets[k].offset = offset;
582 p->sorted_offsets[k].idx = i;
586 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
587 return got_error(GOT_ERR_BAD_PACKIDX);
589 qsort(p->sorted_offsets, nobj - p->nlargeobj,
590 sizeof(p->sorted_offsets[0]), offset_cmp);
592 if (p->sorted_large_offsets)
593 qsort(p->sorted_large_offsets, p->nlargeobj,
594 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
599 const struct got_error *
600 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
602 const struct got_error *err;
603 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
608 if (packidx->sorted_offsets == NULL) {
609 err = build_offset_index(packidx);
614 if (offset >= 0x7fffffff) {
616 left = 0, right = packidx->nlargeobj - 1;
617 while (left <= right) {
618 i = ((left + right) / 2);
619 lo = packidx->sorted_large_offsets[i].offset;
621 *idx = packidx->sorted_large_offsets[i].idx;
623 } else if (offset > lo)
625 else if (offset < lo)
630 left = 0, right = totobj - packidx->nlargeobj - 1;
631 while (left <= right) {
632 i = ((left + right) / 2);
633 o = packidx->sorted_offsets[i].offset;
635 *idx = packidx->sorted_offsets[i].idx;
637 } else if (offset > o)
647 const struct got_error *
648 got_packidx_get_object_id(struct got_object_id *id,
649 struct got_packidx *packidx, int idx)
651 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
652 struct got_packidx_object_id *oid;
654 if (idx < 0 || idx >= totobj)
655 return got_error(GOT_ERR_NO_OBJ);
657 oid = &packidx->hdr.sorted_ids[idx];
658 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
662 const struct got_error *
663 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
664 struct got_packidx *packidx, const char *id_str_prefix)
666 const struct got_error *err = NULL;
668 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
670 size_t prefix_len = strlen(id_str_prefix);
671 struct got_packidx_object_id *oid;
674 STAILQ_INIT(matched_ids);
677 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
679 hex[0] = id_str_prefix[0];
680 hex[1] = id_str_prefix[1];
682 if (!got_parse_xdigit(&id0, hex))
683 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
686 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
687 oid = &packidx->hdr.sorted_ids[i];
688 while (i < totobj && oid->sha1[0] == id0) {
689 char id_str[SHA1_DIGEST_STRING_LENGTH];
690 struct got_object_qid *qid;
693 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
694 return got_error(GOT_ERR_NO_SPACE);
696 cmp = strncmp(id_str, id_str_prefix, prefix_len);
698 oid = &packidx->hdr.sorted_ids[++i];
703 err = got_object_qid_alloc_partial(&qid);
706 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
707 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
709 oid = &packidx->hdr.sorted_ids[++i];
713 got_object_id_queue_free(matched_ids);
718 set_max_datasize(void)
722 if (getrlimit(RLIMIT_DATA, &rl) != 0)
725 rl.rlim_cur = rl.rlim_max;
726 setrlimit(RLIMIT_DATA, &rl);
729 const struct got_error *
730 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
732 const struct got_error *err = NULL;
735 struct imsgbuf *ibuf;
737 ibuf = calloc(1, sizeof(*ibuf));
739 return got_error_from_errno("calloc");
741 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
742 if (pack->privsep_child == NULL) {
743 err = got_error_from_errno("calloc");
747 pack->child_has_tempfiles = 0;
748 pack->child_has_delta_outfd = 0;
750 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
751 err = got_error_from_errno("socketpair");
757 err = got_error_from_errno("fork");
759 } else if (pid == 0) {
761 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
762 pack->path_packfile);
766 if (close(imsg_fds[1]) == -1)
767 return got_error_from_errno("close");
768 pack->privsep_child->imsg_fd = imsg_fds[0];
769 pack->privsep_child->pid = pid;
770 imsg_init(ibuf, imsg_fds[0]);
771 pack->privsep_child->ibuf = ibuf;
773 err = got_privsep_init_pack_child(ibuf, pack, packidx);
775 const struct got_error *child_err;
776 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
777 child_err = got_privsep_wait_for_child(
778 pack->privsep_child->pid);
779 if (child_err && err == NULL)
785 free(pack->privsep_child);
786 pack->privsep_child = NULL;
791 static const struct got_error *
792 pack_stop_privsep_child(struct got_pack *pack)
794 const struct got_error *err = NULL;
796 if (pack->privsep_child == NULL)
799 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
802 err = got_privsep_wait_for_child(pack->privsep_child->pid);
803 if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
804 err = got_error_from_errno("close");
805 free(pack->privsep_child->ibuf);
806 free(pack->privsep_child);
807 pack->privsep_child = NULL;
811 const struct got_error *
812 got_pack_close(struct got_pack *pack)
814 const struct got_error *err = NULL;
816 err = pack_stop_privsep_child(pack);
817 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
818 err = got_error_from_errno("munmap");
819 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
820 err = got_error_from_errno("close");
822 free(pack->path_packfile);
823 pack->path_packfile = NULL;
825 if (pack->delta_cache) {
826 got_delta_cache_free(pack->delta_cache);
827 pack->delta_cache = NULL;
831 * Leave accumfd and basefd alone. They are managed by the
832 * repository layer and can be reused.
838 const struct got_error *
839 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
840 struct got_pack *pack, off_t offset)
850 if (offset >= pack->filesize)
851 return got_error(GOT_ERR_PACK_OFFSET);
854 mapoff = (size_t)offset;
856 if (lseek(pack->fd, offset, SEEK_SET) == -1)
857 return got_error_from_errno("lseek");
861 /* We do not support size values which don't fit in 64 bit. */
863 return got_error(GOT_ERR_NO_SPACE);
866 if (mapoff + sizeof(sizeN) >= pack->filesize)
867 return got_error(GOT_ERR_BAD_PACKFILE);
868 sizeN = *(pack->map + mapoff);
869 mapoff += sizeof(sizeN);
871 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
873 return got_error_from_errno("read");
874 if (n != sizeof(sizeN))
875 return got_error(GOT_ERR_BAD_PACKFILE);
877 *len += sizeof(sizeN);
880 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
881 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
882 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
884 size_t shift = 4 + 7 * (i - 1);
885 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
888 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
895 static const struct got_error *
896 open_plain_object(struct got_object **obj, struct got_object_id *id,
897 uint8_t type, off_t offset, size_t size, int idx)
899 *obj = calloc(1, sizeof(**obj));
901 return got_error_from_errno("calloc");
904 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
905 (*obj)->pack_idx = idx;
908 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
909 (*obj)->pack_offset = offset;
914 static const struct got_error *
915 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
926 /* We do not support offset values which don't fit in 64 bit. */
928 return got_error(GOT_ERR_NO_SPACE);
932 mapoff = (size_t)delta_offset + *len;
933 if (mapoff + sizeof(offN) >= pack->filesize)
934 return got_error(GOT_ERR_PACK_OFFSET);
935 offN = *(pack->map + mapoff);
938 n = read(pack->fd, &offN, sizeof(offN));
940 return got_error_from_errno("read");
941 if (n != sizeof(offN))
942 return got_error(GOT_ERR_BAD_PACKFILE);
944 *len += sizeof(offN);
947 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
951 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
954 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
960 const struct got_error *
961 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
962 struct got_pack *pack, off_t offset, int tslen)
964 const struct got_error *err;
970 err = parse_negative_offset(&negoffset, &negofflen, pack,
975 /* Compute the base object's offset (must be in the same pack file). */
976 *base_offset = (offset - negoffset);
977 if (*base_offset <= 0)
978 return got_error(GOT_ERR_BAD_PACKFILE);
984 static const struct got_error *
985 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
986 size_t *delta_compressed_len, size_t delta_data_offset,
987 struct got_pack *pack)
989 const struct got_error *err = NULL;
993 if (delta_data_offset >= pack->filesize)
994 return got_error(GOT_ERR_PACK_OFFSET);
995 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
996 &consumed, NULL, pack->map, delta_data_offset,
997 pack->filesize - delta_data_offset);
1001 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1002 return got_error_from_errno("lseek");
1003 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1004 &consumed, NULL, 0, pack->fd);
1009 if (delta_compressed_len)
1010 *delta_compressed_len = consumed;
1015 static const struct got_error *
1016 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1017 int delta_type, size_t delta_size, size_t delta_data_offset)
1019 struct got_delta *delta;
1021 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1024 return got_error_from_errno("got_delta_open");
1025 /* delta is freed in got_object_close() */
1027 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1031 static const struct got_error *
1032 resolve_offset_delta(struct got_delta_chain *deltas,
1033 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1034 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1037 const struct got_error *err;
1042 off_t delta_data_offset;
1045 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1046 delta_offset, tslen);
1050 delta_data_offset = delta_offset + tslen + consumed;
1051 if (delta_data_offset >= pack->filesize)
1052 return got_error(GOT_ERR_PACK_OFFSET);
1054 if (pack->map == NULL) {
1055 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1056 if (delta_data_offset == -1)
1057 return got_error_from_errno("lseek");
1060 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1065 /* An offset delta must be in the same packfile. */
1066 if (base_offset >= pack->filesize)
1067 return got_error(GOT_ERR_PACK_OFFSET);
1069 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1070 &base_tslen, pack, base_offset);
1074 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1075 base_tslen, base_type, base_size, recursion - 1);
1078 const struct got_error *
1079 got_pack_parse_ref_delta(struct got_object_id *id,
1080 struct got_pack *pack, off_t delta_offset, int tslen)
1083 size_t mapoff = delta_offset + tslen;
1084 if (mapoff + sizeof(*id) >= pack->filesize)
1085 return got_error(GOT_ERR_PACK_OFFSET);
1086 memcpy(id, pack->map + mapoff, sizeof(*id));
1089 n = read(pack->fd, id, sizeof(*id));
1091 return got_error_from_errno("read");
1092 if (n != sizeof(*id))
1093 return got_error(GOT_ERR_BAD_PACKFILE);
1099 static const struct got_error *
1100 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1101 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1102 size_t delta_size, unsigned int recursion)
1104 const struct got_error *err;
1105 struct got_object_id id;
1111 off_t delta_data_offset;
1113 if (delta_offset + tslen >= pack->filesize)
1114 return got_error(GOT_ERR_PACK_OFFSET);
1116 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1120 delta_data_offset = delta_offset + tslen + sizeof(id);
1122 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1123 if (delta_data_offset == -1)
1124 return got_error_from_errno("lseek");
1127 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1132 /* Delta base must be in the same pack file. */
1133 idx = got_packidx_get_object_idx(packidx, &id);
1135 return got_error(GOT_ERR_NO_OBJ);
1137 base_offset = got_packidx_get_object_offset(packidx, idx);
1138 if (base_offset == -1)
1139 return got_error(GOT_ERR_BAD_PACKIDX);
1141 if (base_offset >= pack->filesize)
1142 return got_error(GOT_ERR_PACK_OFFSET);
1144 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1145 &base_tslen, pack, base_offset);
1149 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1150 base_tslen, base_type, base_size, recursion - 1);
1153 const struct got_error *
1154 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1155 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1156 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1158 const struct got_error *err = NULL;
1160 if (--recursion == 0)
1161 return got_error(GOT_ERR_RECURSION);
1163 switch (delta_type) {
1164 case GOT_OBJ_TYPE_COMMIT:
1165 case GOT_OBJ_TYPE_TREE:
1166 case GOT_OBJ_TYPE_BLOB:
1167 case GOT_OBJ_TYPE_TAG:
1168 /* Plain types are the final delta base. Recursion ends. */
1169 err = add_delta(deltas, delta_offset, tslen, delta_type,
1172 case GOT_OBJ_TYPE_OFFSET_DELTA:
1173 err = resolve_offset_delta(deltas, packidx, pack,
1174 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1176 case GOT_OBJ_TYPE_REF_DELTA:
1177 err = resolve_ref_delta(deltas, packidx, pack,
1178 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1181 return got_error(GOT_ERR_OBJ_TYPE);
1187 static const struct got_error *
1188 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1189 struct got_pack *pack, struct got_object_id *id, off_t offset,
1190 size_t tslen, int delta_type, size_t delta_size, int idx)
1192 const struct got_error *err = NULL;
1195 *obj = calloc(1, sizeof(**obj));
1197 return got_error_from_errno("calloc");
1201 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1202 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1203 (*obj)->pack_offset = offset + tslen;
1205 STAILQ_INIT(&(*obj)->deltas.entries);
1206 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1207 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1208 (*obj)->pack_idx = idx;
1210 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1211 offset, tslen, delta_type, delta_size,
1212 GOT_DELTA_CHAIN_RECURSION_MAX);
1216 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1219 (*obj)->type = resolved_type;
1222 got_object_close(*obj);
1228 const struct got_error *
1229 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1230 struct got_packidx *packidx, int idx, struct got_object_id *id)
1232 const struct got_error *err = NULL;
1240 offset = got_packidx_get_object_offset(packidx, idx);
1242 return got_error(GOT_ERR_BAD_PACKIDX);
1244 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1250 case GOT_OBJ_TYPE_COMMIT:
1251 case GOT_OBJ_TYPE_TREE:
1252 case GOT_OBJ_TYPE_BLOB:
1253 case GOT_OBJ_TYPE_TAG:
1254 err = open_plain_object(obj, id, type, offset + tslen,
1257 case GOT_OBJ_TYPE_OFFSET_DELTA:
1258 case GOT_OBJ_TYPE_REF_DELTA:
1259 err = open_delta_object(obj, packidx, pack, id, offset,
1260 tslen, type, size, idx);
1263 err = got_error(GOT_ERR_OBJ_TYPE);
1270 const struct got_error *
1271 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1272 struct got_delta_chain *deltas, struct got_pack *pack)
1274 struct got_delta *delta;
1275 uint64_t base_size = 0, result_size = 0;
1278 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1279 /* Plain object types are the delta base. */
1280 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1281 delta->type != GOT_OBJ_TYPE_TREE &&
1282 delta->type != GOT_OBJ_TYPE_BLOB &&
1283 delta->type != GOT_OBJ_TYPE_TAG) {
1284 const struct got_error *err;
1289 got_delta_cache_get(&delta_buf, &delta_len,
1290 pack->delta_cache, delta->data_offset);
1291 if (delta_buf == NULL) {
1293 err = read_delta_data(&delta_buf, &delta_len,
1294 NULL, delta->data_offset, pack);
1297 err = got_delta_cache_add(pack->delta_cache,
1298 delta->data_offset, delta_buf, delta_len);
1301 else if (err->code != GOT_ERR_NO_SPACE) {
1306 err = got_delta_get_sizes(&base_size, &result_size,
1307 delta_buf, delta_len);
1313 base_size = delta->size;
1314 if (base_size > *max_size)
1315 *max_size = base_size;
1316 if (result_size > *max_size)
1317 *max_size = result_size;
1323 const struct got_error *
1324 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1325 struct got_pack *pack)
1327 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1328 return got_error(GOT_ERR_OBJ_TYPE);
1330 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1333 const struct got_error *
1334 got_pack_dump_delta_chain_to_file(size_t *result_size,
1335 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1336 FILE *base_file, FILE *accum_file)
1338 const struct got_error *err = NULL;
1339 struct got_delta *delta;
1340 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1341 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1342 /* We process small enough files entirely in memory for speed. */
1343 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1344 uint64_t max_size = 0;
1349 if (STAILQ_EMPTY(&deltas->entries))
1350 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1352 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1353 return got_error_from_errno("fseeko");
1354 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1355 return got_error_from_errno("fseeko");
1357 /* Deltas are ordered in ascending order. */
1358 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1359 uint64_t base_size, result_size = 0;
1363 off_t delta_data_offset;
1365 /* Plain object types are the delta base. */
1366 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1367 delta->type != GOT_OBJ_TYPE_TREE &&
1368 delta->type != GOT_OBJ_TYPE_BLOB &&
1369 delta->type != GOT_OBJ_TYPE_TAG) {
1370 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1374 delta_data_offset = delta->offset + delta->tslen;
1375 if (delta_data_offset >= pack->filesize) {
1376 err = got_error(GOT_ERR_PACK_OFFSET);
1379 if (pack->map == NULL) {
1380 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1382 err = got_error_from_errno("lseek");
1386 if (delta->size > max_size)
1387 max_size = delta->size;
1388 if (max_size > max_bufsize) {
1390 mapoff = (size_t)delta_data_offset;
1391 err = got_inflate_to_file_mmap(
1392 &base_bufsz, NULL, NULL, pack->map,
1393 mapoff, pack->filesize - mapoff,
1396 err = got_inflate_to_file_fd(
1397 &base_bufsz, NULL, NULL, pack->fd,
1400 accum_buf = malloc(max_size);
1401 if (accum_buf == NULL) {
1402 err = got_error_from_errno("malloc");
1405 accum_bufsz = max_size;
1407 mapoff = (size_t)delta_data_offset;
1408 err = got_inflate_to_mem_mmap(&base_buf,
1409 &base_bufsz, NULL, NULL,
1411 pack->filesize - mapoff);
1413 err = got_inflate_to_mem_fd(&base_buf,
1414 &base_bufsz, NULL, NULL, max_size,
1420 if (base_buf == NULL)
1425 got_delta_cache_get(&delta_buf, &delta_len,
1426 pack->delta_cache, delta->data_offset);
1427 if (delta_buf == NULL) {
1429 err = read_delta_data(&delta_buf, &delta_len, NULL,
1430 delta->data_offset, pack);
1433 err = got_delta_cache_add(pack->delta_cache,
1434 delta->data_offset, delta_buf, delta_len);
1437 else if (err->code != GOT_ERR_NO_SPACE) {
1443 err = got_delta_get_sizes(&base_size, &result_size,
1444 delta_buf, delta_len);
1447 if (base_size > max_size)
1448 max_size = base_size;
1449 if (result_size > max_size)
1450 max_size = result_size;
1452 if (base_buf && max_size > max_bufsize) {
1453 /* Switch from buffers to temporary files. */
1454 size_t w = fwrite(base_buf, 1, base_bufsz,
1456 if (w != base_bufsz) {
1457 err = got_ferror(outfile, GOT_ERR_IO);
1466 if (base_buf && max_size > base_bufsz) {
1467 uint8_t *p = realloc(base_buf, max_size);
1469 err = got_error_from_errno("realloc");
1473 base_bufsz = max_size;
1476 if (accum_buf && max_size > accum_bufsz) {
1477 uint8_t *p = realloc(accum_buf, max_size);
1479 err = got_error_from_errno("realloc");
1483 accum_bufsz = max_size;
1487 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1488 delta_buf, delta_len, accum_buf,
1489 &accum_size, max_size);
1492 err = got_delta_apply(base_file, delta_buf,
1494 /* Final delta application writes to output file. */
1495 ++n < deltas->nentries ? accum_file : outfile,
1503 if (n < deltas->nentries) {
1504 /* Accumulated delta becomes the new base. */
1506 uint8_t *tmp = accum_buf;
1507 size_t tmp_size = accum_bufsz;
1508 accum_buf = base_buf;
1509 accum_bufsz = base_bufsz;
1511 base_bufsz = tmp_size;
1513 FILE *tmp = accum_file;
1514 accum_file = base_file;
1525 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1527 if (len != accum_size)
1528 err = got_ferror(outfile, GOT_ERR_IO);
1532 *result_size = accum_size;
1536 const struct got_error *
1537 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1538 struct got_delta_chain *deltas, struct got_pack *pack)
1540 const struct got_error *err = NULL;
1541 struct got_delta *delta;
1542 uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1543 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1544 uint64_t max_size = 0;
1550 if (STAILQ_EMPTY(&deltas->entries))
1551 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1553 /* Deltas are ordered in ascending order. */
1554 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1555 uint64_t base_size, result_size = 0;
1558 size_t delta_data_offset;
1560 /* Plain object types are the delta base. */
1561 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1562 delta->type != GOT_OBJ_TYPE_TREE &&
1563 delta->type != GOT_OBJ_TYPE_BLOB &&
1564 delta->type != GOT_OBJ_TYPE_TAG) {
1565 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1569 delta_data_offset = delta->offset + delta->tslen;
1570 if (delta_data_offset >= pack->filesize) {
1571 err = got_error(GOT_ERR_PACK_OFFSET);
1575 if (delta->size > max_size)
1576 max_size = delta->size;
1579 size_t mapoff = (size_t)delta_data_offset;
1580 err = got_inflate_to_mem_mmap(&base_buf,
1581 &base_bufsz, NULL, NULL, pack->map,
1582 mapoff, pack->filesize - mapoff);
1584 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1586 err = got_error_from_errno("lseek");
1589 err = got_inflate_to_mem_fd(&base_buf,
1590 &base_bufsz, NULL, NULL, max_size,
1599 got_delta_cache_get(&delta_buf, &delta_len,
1600 pack->delta_cache, delta->data_offset);
1601 if (delta_buf == NULL) {
1603 err = read_delta_data(&delta_buf, &delta_len, NULL,
1604 delta->data_offset, pack);
1607 err = got_delta_cache_add(pack->delta_cache,
1608 delta->data_offset, delta_buf, delta_len);
1611 else if (err->code != GOT_ERR_NO_SPACE) {
1617 err = got_delta_get_sizes(&base_size, &result_size,
1618 delta_buf, delta_len);
1621 if (base_size > max_size)
1622 max_size = base_size;
1623 if (result_size > max_size)
1624 max_size = result_size;
1626 if (max_size > base_bufsz) {
1627 uint8_t *p = realloc(base_buf, max_size);
1629 err = got_error_from_errno("realloc");
1633 base_bufsz = max_size;
1636 if (max_size > accum_bufsz) {
1637 uint8_t *p = realloc(accum_buf, max_size);
1639 err = got_error_from_errno("realloc");
1643 accum_bufsz = max_size;
1646 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1647 delta_buf, delta_len, accum_buf,
1648 &accum_size, max_size);
1655 if (n < deltas->nentries) {
1656 /* Accumulated delta becomes the new base. */
1657 uint8_t *tmp = accum_buf;
1658 size_t tmp_size = accum_bufsz;
1659 accum_buf = base_buf;
1660 accum_bufsz = base_bufsz;
1662 base_bufsz = tmp_size;
1673 *outbuf = accum_buf;
1674 *outlen = accum_size;
1679 const struct got_error *
1680 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1681 FILE *outfile, FILE *base_file, FILE *accum_file)
1683 const struct got_error *err = NULL;
1685 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1686 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1688 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1689 if (obj->pack_offset >= pack->filesize)
1690 return got_error(GOT_ERR_PACK_OFFSET);
1693 size_t mapoff = (size_t)obj->pack_offset;
1694 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1695 pack->map, mapoff, pack->filesize - mapoff,
1698 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1699 return got_error_from_errno("lseek");
1700 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1704 err = got_pack_dump_delta_chain_to_file(&obj->size,
1705 &obj->deltas, pack, outfile, base_file, accum_file);
1710 const struct got_error *
1711 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1712 struct got_object *obj, struct got_pack *pack)
1714 const struct got_error *err = NULL;
1716 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1717 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1719 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1720 if (obj->pack_offset >= pack->filesize)
1721 return got_error(GOT_ERR_PACK_OFFSET);
1723 size_t mapoff = (size_t)obj->pack_offset;
1724 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1725 pack->map, mapoff, pack->filesize - mapoff);
1727 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1728 return got_error_from_errno("lseek");
1729 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1730 obj->size, pack->fd);
1733 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1739 static const struct got_error *
1740 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1741 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1742 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1744 const struct got_error *err = NULL;
1746 /* Validate decompression and obtain the decompressed size. */
1747 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1748 delta_data_offset, pack);
1752 /* Read delta base/result sizes from head of delta stream. */
1753 err = got_delta_get_sizes(base_size, result_size,
1754 *delta_buf, *delta_len);
1758 /* Discard decompressed delta and read it again in compressed form. */
1760 *delta_buf = malloc(*delta_len_compressed);
1761 if (*delta_buf == NULL) {
1762 err = got_error_from_errno("malloc");
1766 if (delta_data_offset >= pack->filesize)
1767 err = got_error(GOT_ERR_PACK_OFFSET);
1768 memcpy(*delta_buf, pack->map + delta_data_offset,
1769 *delta_len_compressed);
1772 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1773 err = got_error_from_errno("lseek");
1776 n = read(pack->fd, *delta_buf, *delta_len_compressed);
1778 err = got_error_from_errno("read");
1780 } else if (n != *delta_len_compressed) {
1781 err = got_error(GOT_ERR_IO);
1790 *delta_len_compressed = 0;
1797 const struct got_error *
1798 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1799 size_t *delta_compressed_size, off_t *delta_offset, off_t *base_offset,
1800 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1801 struct got_pack *pack, struct got_packidx *packidx, int idx)
1803 const struct got_error *err = NULL;
1807 size_t tslen, delta_hdrlen;
1808 off_t delta_data_offset;
1812 *delta_compressed_size = 0;
1818 offset = got_packidx_get_object_offset(packidx, idx);
1820 return got_error(GOT_ERR_BAD_PACKIDX);
1822 if (offset >= pack->filesize)
1823 return got_error(GOT_ERR_PACK_OFFSET);
1825 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1830 if (tslen + size < tslen || offset + size < size ||
1831 tslen + offset < tslen)
1832 return got_error(GOT_ERR_PACK_OFFSET);
1835 case GOT_OBJ_TYPE_OFFSET_DELTA:
1836 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1837 pack, offset, tslen);
1841 case GOT_OBJ_TYPE_REF_DELTA:
1842 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1845 delta_hdrlen = SHA1_DIGEST_LENGTH;
1848 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1849 "non-delta object type %d found at offset %lld",
1850 type, (long long)offset);
1853 if (tslen + delta_hdrlen < delta_hdrlen ||
1854 offset + delta_hdrlen < delta_hdrlen)
1855 return got_error(GOT_ERR_BAD_DELTA);
1857 delta_data_offset = offset + tslen + delta_hdrlen;
1858 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1859 base_size, result_size, delta_data_offset, pack, packidx);
1863 if (*delta_size != size) {
1864 err = got_error(GOT_ERR_BAD_DELTA);
1868 *delta_offset = offset;
1874 *delta_compressed_size = 0;