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>
39 #include "got_error.h"
40 #include "got_object.h"
43 #include "got_lib_hash.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_delta_cache.h"
46 #include "got_lib_inflate.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_parse.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_pack.h"
53 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
57 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
60 static const struct got_error *
61 verify_fanout_table(uint32_t *fanout_table)
65 for (i = 0; i < 0xff - 1; i++) {
66 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
67 return got_error(GOT_ERR_BAD_PACKIDX);
73 const struct got_error *
74 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
76 const struct got_error *err = NULL;
77 enum got_hash_algorithm algo = GOT_HASH_SHA1;
78 struct got_packidx_v2_hdr *h;
80 uint8_t hash[GOT_HASH_DIGEST_MAXLEN];
81 size_t nobj, len_fanout, len_ids, offset, remain;
85 got_hash_init(&ctx, algo);
91 if (remain < sizeof(*h->magic)) {
92 err = got_error(GOT_ERR_BAD_PACKIDX);
96 h->magic = (uint32_t *)(p->map + offset);
98 h->magic = malloc(sizeof(*h->magic));
99 if (h->magic == NULL) {
100 err = got_error_from_errno("malloc");
103 n = read(p->fd, h->magic, sizeof(*h->magic));
105 err = got_error_from_errno("read");
107 } else if (n != sizeof(*h->magic)) {
108 err = got_error(GOT_ERR_BAD_PACKIDX);
112 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
113 err = got_error(GOT_ERR_BAD_PACKIDX);
116 offset += sizeof(*h->magic);
117 remain -= sizeof(*h->magic);
120 got_hash_update(&ctx, h->magic, sizeof(*h->magic));
122 if (remain < sizeof(*h->version)) {
123 err = got_error(GOT_ERR_BAD_PACKIDX);
127 h->version = (uint32_t *)(p->map + offset);
129 h->version = malloc(sizeof(*h->version));
130 if (h->version == NULL) {
131 err = got_error_from_errno("malloc");
134 n = read(p->fd, h->version, sizeof(*h->version));
136 err = got_error_from_errno("read");
138 } else if (n != sizeof(*h->version)) {
139 err = got_error(GOT_ERR_BAD_PACKIDX);
143 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
144 err = got_error(GOT_ERR_BAD_PACKIDX);
147 offset += sizeof(*h->version);
148 remain -= sizeof(*h->version);
151 got_hash_update(&ctx, h->version, sizeof(*h->version));
154 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
155 if (remain < len_fanout) {
156 err = got_error(GOT_ERR_BAD_PACKIDX);
160 h->fanout_table = (uint32_t *)(p->map + offset);
162 h->fanout_table = malloc(len_fanout);
163 if (h->fanout_table == NULL) {
164 err = got_error_from_errno("malloc");
167 n = read(p->fd, h->fanout_table, len_fanout);
169 err = got_error_from_errno("read");
171 } else if (n != len_fanout) {
172 err = got_error(GOT_ERR_BAD_PACKIDX);
176 err = verify_fanout_table(h->fanout_table);
180 got_hash_update(&ctx, h->fanout_table, len_fanout);
181 offset += len_fanout;
182 remain -= len_fanout;
184 nobj = be32toh(h->fanout_table[0xff]);
185 len_ids = nobj * sizeof(*h->sorted_ids);
186 if (len_ids <= nobj || len_ids > remain) {
187 err = got_error(GOT_ERR_BAD_PACKIDX);
192 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
194 h->sorted_ids = malloc(len_ids);
195 if (h->sorted_ids == NULL) {
196 err = got_error(GOT_ERR_BAD_PACKIDX);
199 n = read(p->fd, h->sorted_ids, len_ids);
201 err = got_error_from_errno("read");
202 else if (n != len_ids) {
203 err = got_error(GOT_ERR_BAD_PACKIDX);
208 got_hash_update(&ctx, h->sorted_ids, len_ids);
212 if (remain < nobj * sizeof(*h->crc32)) {
213 err = got_error(GOT_ERR_BAD_PACKIDX);
217 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
219 h->crc32 = malloc(nobj * sizeof(*h->crc32));
220 if (h->crc32 == NULL) {
221 err = got_error_from_errno("malloc");
224 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
226 err = got_error_from_errno("read");
227 else if (n != nobj * sizeof(*h->crc32)) {
228 err = got_error(GOT_ERR_BAD_PACKIDX);
233 got_hash_update(&ctx, h->crc32, nobj * sizeof(*h->crc32));
234 remain -= nobj * sizeof(*h->crc32);
235 offset += nobj * sizeof(*h->crc32);
237 if (remain < nobj * sizeof(*h->offsets)) {
238 err = got_error(GOT_ERR_BAD_PACKIDX);
242 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
244 h->offsets = malloc(nobj * sizeof(*h->offsets));
245 if (h->offsets == NULL) {
246 err = got_error_from_errno("malloc");
249 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
251 err = got_error_from_errno("read");
252 else if (n != nobj * sizeof(*h->offsets)) {
253 err = got_error(GOT_ERR_BAD_PACKIDX);
258 got_hash_update(&ctx, h->offsets, nobj * sizeof(*h->offsets));
259 remain -= nobj * sizeof(*h->offsets);
260 offset += nobj * sizeof(*h->offsets);
262 /* Large file offsets are contained only in files > 2GB. */
263 if (verify || packfile_size > 0x7fffffff) {
264 for (i = 0; i < nobj; i++) {
265 uint32_t o = h->offsets[i];
266 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
270 if (p->nlargeobj == 0)
272 else if (packfile_size <= 0x7fffffff) {
273 err = got_error(GOT_ERR_BAD_PACKIDX);
277 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
278 err = got_error(GOT_ERR_BAD_PACKIDX);
282 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
284 h->large_offsets = malloc(p->nlargeobj *
285 sizeof(*h->large_offsets));
286 if (h->large_offsets == NULL) {
287 err = got_error_from_errno("malloc");
290 n = read(p->fd, h->large_offsets,
291 p->nlargeobj * sizeof(*h->large_offsets));
293 err = got_error_from_errno("read");
294 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
295 err = got_error(GOT_ERR_BAD_PACKIDX);
300 got_hash_update(&ctx, h->large_offsets,
301 p->nlargeobj * sizeof(*h->large_offsets));
302 remain -= p->nlargeobj * sizeof(*h->large_offsets);
303 offset += p->nlargeobj * sizeof(*h->large_offsets);
306 if (remain < sizeof(*h->trailer)) {
307 err = got_error(GOT_ERR_BAD_PACKIDX);
312 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
314 h->trailer = malloc(sizeof(*h->trailer));
315 if (h->trailer == NULL) {
316 err = got_error_from_errno("malloc");
319 n = read(p->fd, h->trailer, sizeof(*h->trailer));
321 err = got_error_from_errno("read");
322 else if (n != sizeof(*h->trailer)) {
323 err = got_error(GOT_ERR_BAD_PACKIDX);
328 got_hash_update(&ctx, h->trailer->packfile_sha1,
330 got_hash_final(&ctx, hash);
331 if (got_hash_cmp(ctx.algo, hash, h->trailer->packidx_sha1) != 0)
332 err = got_error(GOT_ERR_PACKIDX_CSUM);
338 const struct got_error *
339 got_packidx_open(struct got_packidx **packidx,
340 int dir_fd, const char *relpath, int verify)
342 const struct got_error *err = NULL;
343 struct got_packidx *p = NULL;
345 struct stat idx_sb, pack_sb;
349 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
354 * Ensure that a corresponding pack file exists.
355 * Some Git repositories have this problem. Git seems to ignore
356 * the existence of lonely pack index files but we do not.
358 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
359 if (errno == ENOENT) {
360 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
363 err = got_error_from_errno2("fstatat", pack_relpath);
367 p = calloc(1, sizeof(*p));
369 err = got_error_from_errno("calloc");
373 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
375 err = got_error_from_errno2("openat", relpath);
379 if (fstat(p->fd, &idx_sb) != 0) {
380 err = got_error_from_errno2("fstat", relpath);
383 p->len = idx_sb.st_size;
384 if (p->len < sizeof(p->hdr)) {
385 err = got_error(GOT_ERR_BAD_PACKIDX);
389 p->path_packidx = strdup(relpath);
390 if (p->path_packidx == NULL) {
391 err = got_error_from_errno("strdup");
395 #ifndef GOT_PACK_NO_MMAP
396 if (p->len > 0 && p->len <= SIZE_MAX) {
397 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
398 if (p->map == MAP_FAILED) {
399 if (errno != ENOMEM) {
400 err = got_error_from_errno("mmap");
403 p->map = NULL; /* fall back to read(2) */
408 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
412 got_packidx_close(p);
419 const struct got_error *
420 got_packidx_close(struct got_packidx *packidx)
422 const struct got_error *err = NULL;
424 free(packidx->path_packidx);
426 if (munmap(packidx->map, packidx->len) == -1)
427 err = got_error_from_errno("munmap");
429 free(packidx->hdr.magic);
430 free(packidx->hdr.version);
431 free(packidx->hdr.fanout_table);
432 free(packidx->hdr.sorted_ids);
433 free(packidx->hdr.crc32);
434 free(packidx->hdr.offsets);
435 free(packidx->hdr.large_offsets);
436 free(packidx->hdr.trailer);
438 if (close(packidx->fd) == -1 && err == NULL)
439 err = got_error_from_errno("close");
440 free(packidx->sorted_offsets);
441 free(packidx->sorted_large_offsets);
447 const struct got_error *
448 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
452 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
453 size = strlen(path_packidx) + 2;
454 if (size < GOT_PACKFILE_NAMELEN + 1)
455 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
457 *path_packfile = malloc(size);
458 if (*path_packfile == NULL)
459 return got_error_from_errno("malloc");
461 /* Copy up to and excluding ".idx". */
462 if (strlcpy(*path_packfile, path_packidx,
463 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
464 return got_error(GOT_ERR_NO_SPACE);
466 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
467 return got_error(GOT_ERR_NO_SPACE);
473 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
475 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
476 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
478 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
479 if (idx < 0 || idx >= packidx->nlargeobj ||
480 packidx->hdr.large_offsets == NULL)
482 loffset = be64toh(packidx->hdr.large_offsets[idx]);
483 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
485 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
489 got_packidx_get_object_idx(struct got_packidx *packidx,
490 struct got_object_id *id)
492 u_int8_t id0 = id->sha1[0];
493 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
494 int left = 0, right = totobj - 1;
497 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
499 while (left <= right) {
500 struct got_packidx_object_id *oid;
503 i = ((left + right) / 2);
504 oid = &packidx->hdr.sorted_ids[i];
505 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
518 offset_cmp(const void *pa, const void *pb)
520 const struct got_pack_offset_index *a, *b;
522 a = (const struct got_pack_offset_index *)pa;
523 b = (const struct got_pack_offset_index *)pb;
525 if (a->offset < b->offset)
527 else if (a->offset > b->offset)
534 large_offset_cmp(const void *pa, const void *pb)
536 const struct got_pack_large_offset_index *a, *b;
538 a = (const struct got_pack_large_offset_index *)pa;
539 b = (const struct got_pack_large_offset_index *)pb;
541 if (a->offset < b->offset)
543 else if (a->offset > b->offset)
549 static const struct got_error *
550 build_offset_index(struct got_packidx *p)
552 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
553 unsigned int i, j, k;
555 p->sorted_offsets = calloc(nobj - p->nlargeobj,
556 sizeof(p->sorted_offsets[0]));
557 if (p->sorted_offsets == NULL)
558 return got_error_from_errno("calloc");
560 if (p->nlargeobj > 0) {
561 p->sorted_large_offsets = calloc(p->nlargeobj,
562 sizeof(p->sorted_large_offsets[0]));
563 if (p->sorted_large_offsets == NULL)
564 return got_error_from_errno("calloc");
569 for (i = 0; i < nobj; i++) {
570 uint32_t offset = be32toh(p->hdr.offsets[i]);
571 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
574 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
575 if (idx >= p->nlargeobj ||
577 p->hdr.large_offsets == NULL)
578 return got_error(GOT_ERR_BAD_PACKIDX);
579 loffset = be64toh(p->hdr.large_offsets[idx]);
580 p->sorted_large_offsets[j].offset = loffset;
581 p->sorted_large_offsets[j].idx = i;
584 p->sorted_offsets[k].offset = offset;
585 p->sorted_offsets[k].idx = i;
589 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
590 return got_error(GOT_ERR_BAD_PACKIDX);
592 qsort(p->sorted_offsets, nobj - p->nlargeobj,
593 sizeof(p->sorted_offsets[0]), offset_cmp);
595 if (p->sorted_large_offsets)
596 qsort(p->sorted_large_offsets, p->nlargeobj,
597 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
602 const struct got_error *
603 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
605 const struct got_error *err;
606 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
611 if (packidx->sorted_offsets == NULL) {
612 err = build_offset_index(packidx);
617 if (offset >= 0x7fffffff) {
619 left = 0, right = packidx->nlargeobj - 1;
620 while (left <= right) {
621 i = ((left + right) / 2);
622 lo = packidx->sorted_large_offsets[i].offset;
624 *idx = packidx->sorted_large_offsets[i].idx;
626 } else if (offset > lo)
628 else if (offset < lo)
633 left = 0, right = totobj - packidx->nlargeobj - 1;
634 while (left <= right) {
635 i = ((left + right) / 2);
636 o = packidx->sorted_offsets[i].offset;
638 *idx = packidx->sorted_offsets[i].idx;
640 } else if (offset > o)
650 const struct got_error *
651 got_packidx_get_object_id(struct got_object_id *id,
652 struct got_packidx *packidx, int idx)
654 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
655 struct got_packidx_object_id *oid;
657 if (idx < 0 || idx >= totobj)
658 return got_error(GOT_ERR_NO_OBJ);
660 oid = &packidx->hdr.sorted_ids[idx];
661 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
665 const struct got_error *
666 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
667 struct got_packidx *packidx, const char *id_str_prefix)
669 const struct got_error *err = NULL;
671 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
673 size_t prefix_len = strlen(id_str_prefix);
674 struct got_packidx_object_id *oid;
677 STAILQ_INIT(matched_ids);
680 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
682 hex[0] = id_str_prefix[0];
683 hex[1] = id_str_prefix[1];
685 if (!got_parse_xdigit(&id0, hex))
686 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
689 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
690 oid = &packidx->hdr.sorted_ids[i];
691 while (i < totobj && oid->sha1[0] == id0) {
692 char id_str[SHA1_DIGEST_STRING_LENGTH];
693 struct got_object_qid *qid;
696 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
697 return got_error(GOT_ERR_NO_SPACE);
699 cmp = strncmp(id_str, id_str_prefix, prefix_len);
701 oid = &packidx->hdr.sorted_ids[++i];
706 err = got_object_qid_alloc_partial(&qid);
709 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
710 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
712 oid = &packidx->hdr.sorted_ids[++i];
716 got_object_id_queue_free(matched_ids);
721 set_max_datasize(void)
725 if (getrlimit(RLIMIT_DATA, &rl) != 0)
728 rl.rlim_cur = rl.rlim_max;
729 setrlimit(RLIMIT_DATA, &rl);
732 const struct got_error *
733 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
735 const struct got_error *err = NULL;
738 struct imsgbuf *ibuf;
740 ibuf = calloc(1, sizeof(*ibuf));
742 return got_error_from_errno("calloc");
744 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
745 if (pack->privsep_child == NULL) {
746 err = got_error_from_errno("calloc");
750 pack->child_has_tempfiles = 0;
751 pack->child_has_delta_outfd = 0;
753 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
754 err = got_error_from_errno("socketpair");
760 err = got_error_from_errno("fork");
762 } else if (pid == 0) {
764 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
765 pack->path_packfile);
769 if (close(imsg_fds[1]) == -1)
770 return got_error_from_errno("close");
771 pack->privsep_child->imsg_fd = imsg_fds[0];
772 pack->privsep_child->pid = pid;
773 imsg_init(ibuf, imsg_fds[0]);
774 pack->privsep_child->ibuf = ibuf;
776 err = got_privsep_init_pack_child(ibuf, pack, packidx);
778 const struct got_error *child_err;
779 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
780 child_err = got_privsep_wait_for_child(
781 pack->privsep_child->pid);
782 if (child_err && err == NULL)
788 free(pack->privsep_child);
789 pack->privsep_child = NULL;
794 static const struct got_error *
795 pack_stop_privsep_child(struct got_pack *pack)
797 const struct got_error *err = NULL, *close_err = NULL;
799 if (pack->privsep_child == NULL)
802 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
805 if (close(pack->privsep_child->imsg_fd) == -1)
806 close_err = got_error_from_errno("close");
807 err = got_privsep_wait_for_child(pack->privsep_child->pid);
808 if (close_err && err == NULL)
810 imsg_clear(pack->privsep_child->ibuf);
811 free(pack->privsep_child->ibuf);
812 free(pack->privsep_child);
813 pack->privsep_child = NULL;
817 const struct got_error *
818 got_pack_close(struct got_pack *pack)
820 const struct got_error *err = NULL;
822 err = pack_stop_privsep_child(pack);
823 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
824 err = got_error_from_errno("munmap");
825 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
826 err = got_error_from_errno("close");
828 free(pack->path_packfile);
829 pack->path_packfile = NULL;
831 if (pack->delta_cache) {
832 got_delta_cache_free(pack->delta_cache);
833 pack->delta_cache = NULL;
837 * Leave accumfd and basefd alone. They are managed by the
838 * repository layer and can be reused.
844 const struct got_error *
845 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
846 struct got_pack *pack, off_t offset)
856 if (offset >= pack->filesize)
857 return got_error(GOT_ERR_PACK_OFFSET);
860 if (offset > SIZE_MAX) {
861 return got_error_fmt(GOT_ERR_PACK_OFFSET,
862 "offset %lld overflows size_t",
866 mapoff = (size_t)offset;
868 if (lseek(pack->fd, offset, SEEK_SET) == -1)
869 return got_error_from_errno("lseek");
873 /* We do not support size values which don't fit in 64 bit. */
875 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
876 "packfile offset %lld", (long long)offset);
879 if (mapoff + sizeof(sizeN) >= pack->filesize)
880 return got_error(GOT_ERR_BAD_PACKFILE);
881 sizeN = *(pack->map + mapoff);
882 mapoff += sizeof(sizeN);
884 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
886 return got_error_from_errno("read");
887 if (n != sizeof(sizeN))
888 return got_error(GOT_ERR_BAD_PACKFILE);
890 *len += sizeof(sizeN);
893 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
894 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
895 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
897 size_t shift = 4 + 7 * (i - 1);
898 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
901 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
908 static const struct got_error *
909 open_plain_object(struct got_object **obj, struct got_object_id *id,
910 uint8_t type, off_t offset, size_t size, int idx)
912 *obj = calloc(1, sizeof(**obj));
914 return got_error_from_errno("calloc");
917 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
918 (*obj)->pack_idx = idx;
921 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
922 (*obj)->pack_offset = offset;
927 static const struct got_error *
928 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
939 /* We do not support offset values which don't fit in 64 bit. */
941 return got_error(GOT_ERR_NO_SPACE);
946 if (delta_offset + *len > SIZE_MAX) {
947 return got_error_fmt(GOT_ERR_PACK_OFFSET,
948 "mapoff %lld would overflow size_t",
949 (long long)delta_offset + *len);
952 mapoff = (size_t)delta_offset + *len;
953 if (mapoff + sizeof(offN) >= pack->filesize)
954 return got_error(GOT_ERR_PACK_OFFSET);
955 offN = *(pack->map + mapoff);
958 n = read(pack->fd, &offN, sizeof(offN));
960 return got_error_from_errno("read");
961 if (n != sizeof(offN))
962 return got_error(GOT_ERR_BAD_PACKFILE);
964 *len += sizeof(offN);
967 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
971 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
974 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
980 const struct got_error *
981 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
982 struct got_pack *pack, off_t offset, size_t tslen)
984 const struct got_error *err;
990 err = parse_negative_offset(&negoffset, &negofflen, pack,
995 /* Compute the base object's offset (must be in the same pack file). */
996 *base_offset = (offset - negoffset);
997 if (*base_offset <= 0)
998 return got_error(GOT_ERR_BAD_PACKFILE);
1004 static const struct got_error *
1005 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1006 size_t *delta_compressed_len, size_t delta_data_offset,
1007 struct got_pack *pack)
1009 const struct got_error *err = NULL;
1010 size_t consumed = 0;
1013 if (delta_data_offset >= pack->filesize)
1014 return got_error(GOT_ERR_PACK_OFFSET);
1015 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1016 &consumed, NULL, pack->map, delta_data_offset,
1017 pack->filesize - delta_data_offset);
1021 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1022 return got_error_from_errno("lseek");
1023 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1024 &consumed, NULL, 0, pack->fd);
1029 if (delta_compressed_len)
1030 *delta_compressed_len = consumed;
1035 static const struct got_error *
1036 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1037 int delta_type, size_t delta_size, off_t delta_data_offset)
1039 struct got_delta *delta;
1041 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1044 return got_error_from_errno("got_delta_open");
1045 /* delta is freed in got_object_close() */
1047 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1051 static const struct got_error *
1052 resolve_offset_delta(struct got_delta_chain *deltas,
1053 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1054 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1056 const struct got_error *err;
1061 off_t delta_data_offset;
1064 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1065 delta_offset, tslen);
1069 delta_data_offset = delta_offset + tslen + consumed;
1070 if (delta_data_offset >= pack->filesize)
1071 return got_error(GOT_ERR_PACK_OFFSET);
1073 if (pack->map == NULL) {
1074 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1075 if (delta_data_offset == -1)
1076 return got_error_from_errno("lseek");
1079 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1084 /* An offset delta must be in the same packfile. */
1085 if (base_offset >= pack->filesize)
1086 return got_error(GOT_ERR_PACK_OFFSET);
1088 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1089 &base_tslen, pack, base_offset);
1093 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1094 base_tslen, base_type, base_size, recursion - 1);
1097 const struct got_error *
1098 got_pack_parse_ref_delta(struct got_object_id *id,
1099 struct got_pack *pack, off_t delta_offset, int tslen)
1104 if (delta_offset + tslen > SIZE_MAX) {
1105 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1106 "mapoff %lld would overflow size_t",
1107 (long long)delta_offset + tslen);
1110 mapoff = delta_offset + tslen;
1111 if (mapoff + sizeof(*id) >= pack->filesize)
1112 return got_error(GOT_ERR_PACK_OFFSET);
1113 memcpy(id, pack->map + mapoff, sizeof(*id));
1116 n = read(pack->fd, id, sizeof(*id));
1118 return got_error_from_errno("read");
1119 if (n != sizeof(*id))
1120 return got_error(GOT_ERR_BAD_PACKFILE);
1126 static const struct got_error *
1127 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1128 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1129 size_t delta_size, unsigned int recursion)
1131 const struct got_error *err;
1132 struct got_object_id id;
1138 off_t delta_data_offset;
1140 if (delta_offset + tslen >= pack->filesize)
1141 return got_error(GOT_ERR_PACK_OFFSET);
1143 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1147 delta_data_offset = delta_offset + tslen + SHA1_DIGEST_LENGTH;
1149 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1150 if (delta_data_offset == -1)
1151 return got_error_from_errno("lseek");
1154 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1159 /* Delta base must be in the same pack file. */
1160 idx = got_packidx_get_object_idx(packidx, &id);
1162 return got_error(GOT_ERR_NO_OBJ);
1164 base_offset = got_packidx_get_object_offset(packidx, idx);
1165 if (base_offset == -1)
1166 return got_error(GOT_ERR_BAD_PACKIDX);
1168 if (base_offset >= pack->filesize)
1169 return got_error(GOT_ERR_PACK_OFFSET);
1171 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1172 &base_tslen, pack, base_offset);
1176 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1177 base_tslen, base_type, base_size, recursion - 1);
1180 const struct got_error *
1181 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1182 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1183 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1185 const struct got_error *err = NULL;
1187 if (--recursion == 0)
1188 return got_error(GOT_ERR_RECURSION);
1190 switch (delta_type) {
1191 case GOT_OBJ_TYPE_COMMIT:
1192 case GOT_OBJ_TYPE_TREE:
1193 case GOT_OBJ_TYPE_BLOB:
1194 case GOT_OBJ_TYPE_TAG:
1195 /* Plain types are the final delta base. Recursion ends. */
1196 err = add_delta(deltas, delta_offset, tslen, delta_type,
1199 case GOT_OBJ_TYPE_OFFSET_DELTA:
1200 err = resolve_offset_delta(deltas, packidx, pack,
1201 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1203 case GOT_OBJ_TYPE_REF_DELTA:
1204 err = resolve_ref_delta(deltas, packidx, pack,
1205 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1208 return got_error(GOT_ERR_OBJ_TYPE);
1214 static const struct got_error *
1215 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1216 struct got_pack *pack, struct got_object_id *id, off_t offset,
1217 size_t tslen, int delta_type, size_t delta_size, int idx)
1219 const struct got_error *err = NULL;
1222 *obj = calloc(1, sizeof(**obj));
1224 return got_error_from_errno("calloc");
1228 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1229 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1230 (*obj)->pack_offset = offset + tslen;
1232 STAILQ_INIT(&(*obj)->deltas.entries);
1233 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1234 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1235 (*obj)->pack_idx = idx;
1237 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1238 offset, tslen, delta_type, delta_size,
1239 GOT_DELTA_CHAIN_RECURSION_MAX);
1243 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1246 (*obj)->type = resolved_type;
1249 got_object_close(*obj);
1255 const struct got_error *
1256 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1257 struct got_packidx *packidx, int idx, struct got_object_id *id)
1259 const struct got_error *err = NULL;
1267 offset = got_packidx_get_object_offset(packidx, idx);
1269 return got_error(GOT_ERR_BAD_PACKIDX);
1271 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1277 case GOT_OBJ_TYPE_COMMIT:
1278 case GOT_OBJ_TYPE_TREE:
1279 case GOT_OBJ_TYPE_BLOB:
1280 case GOT_OBJ_TYPE_TAG:
1281 err = open_plain_object(obj, id, type, offset + tslen,
1284 case GOT_OBJ_TYPE_OFFSET_DELTA:
1285 case GOT_OBJ_TYPE_REF_DELTA:
1286 err = open_delta_object(obj, packidx, pack, id, offset,
1287 tslen, type, size, idx);
1290 err = got_error(GOT_ERR_OBJ_TYPE);
1297 const struct got_error *
1298 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1299 struct got_delta_chain *deltas, struct got_pack *pack)
1301 struct got_delta *delta;
1302 uint64_t base_size = 0, result_size = 0;
1305 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1306 /* Plain object types are the delta base. */
1307 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1308 delta->type != GOT_OBJ_TYPE_TREE &&
1309 delta->type != GOT_OBJ_TYPE_BLOB &&
1310 delta->type != GOT_OBJ_TYPE_TAG) {
1311 const struct got_error *err;
1312 uint8_t *delta_buf = NULL;
1316 if (pack->delta_cache) {
1317 got_delta_cache_get(&delta_buf, &delta_len,
1318 pack->delta_cache, delta->data_offset);
1320 if (delta_buf == NULL) {
1322 err = read_delta_data(&delta_buf, &delta_len,
1323 NULL, delta->data_offset, pack);
1327 if (pack->delta_cache && !cached) {
1328 err = got_delta_cache_add(pack->delta_cache,
1329 delta->data_offset, delta_buf, delta_len);
1332 else if (err->code != GOT_ERR_NO_SPACE) {
1337 err = got_delta_get_sizes(&base_size, &result_size,
1338 delta_buf, delta_len);
1344 base_size = delta->size;
1345 if (base_size > *max_size)
1346 *max_size = base_size;
1347 if (result_size > *max_size)
1348 *max_size = result_size;
1354 const struct got_error *
1355 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1356 struct got_pack *pack)
1358 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1359 return got_error(GOT_ERR_OBJ_TYPE);
1361 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1364 const struct got_error *
1365 got_pack_dump_delta_chain_to_file(size_t *result_size,
1366 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1367 FILE *base_file, FILE *accum_file)
1369 const struct got_error *err = NULL;
1370 struct got_delta *delta;
1371 uint8_t *base_buf = NULL, *accum_buf = NULL;
1372 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1373 /* We process small enough files entirely in memory for speed. */
1374 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1375 uint64_t max_size = 0;
1380 if (STAILQ_EMPTY(&deltas->entries))
1381 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1383 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1384 return got_error_from_errno("fseeko");
1385 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1386 return got_error_from_errno("fseeko");
1388 /* Deltas are ordered in ascending order. */
1389 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1390 uint8_t *delta_buf = NULL;
1391 uint64_t base_size, result_size = 0;
1395 off_t delta_data_offset;
1397 /* Plain object types are the delta base. */
1398 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1399 delta->type != GOT_OBJ_TYPE_TREE &&
1400 delta->type != GOT_OBJ_TYPE_BLOB &&
1401 delta->type != GOT_OBJ_TYPE_TAG) {
1402 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1406 delta_data_offset = delta->offset + delta->tslen;
1407 if (delta_data_offset >= pack->filesize) {
1408 err = got_error(GOT_ERR_PACK_OFFSET);
1411 if (pack->map == NULL) {
1412 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1414 err = got_error_from_errno("lseek");
1418 if (delta->size > max_size)
1419 max_size = delta->size;
1420 if (max_size > max_bufsize) {
1422 if (delta_data_offset > SIZE_MAX) {
1423 return got_error_fmt(
1425 "delta offset %lld "
1431 mapoff = delta_data_offset;
1432 err = got_inflate_to_file_mmap(
1433 &base_bufsz, NULL, NULL, pack->map,
1434 mapoff, pack->filesize - mapoff,
1437 err = got_inflate_to_file_fd(
1438 &base_bufsz, NULL, NULL, pack->fd,
1441 accum_buf = malloc(max_size);
1442 if (accum_buf == NULL) {
1443 err = got_error_from_errno("malloc");
1446 accum_bufsz = max_size;
1448 if (delta_data_offset > SIZE_MAX) {
1449 return got_error_fmt(
1451 "delta offset %lld "
1457 mapoff = delta_data_offset;
1458 err = got_inflate_to_mem_mmap(&base_buf,
1459 &base_bufsz, NULL, NULL,
1461 pack->filesize - mapoff);
1463 err = got_inflate_to_mem_fd(&base_buf,
1464 &base_bufsz, NULL, NULL, max_size,
1470 if (base_buf == NULL)
1475 if (pack->delta_cache) {
1476 got_delta_cache_get(&delta_buf, &delta_len,
1477 pack->delta_cache, delta->data_offset);
1479 if (delta_buf == NULL) {
1481 err = read_delta_data(&delta_buf, &delta_len, NULL,
1482 delta->data_offset, pack);
1486 if (pack->delta_cache && !cached) {
1487 err = got_delta_cache_add(pack->delta_cache,
1488 delta->data_offset, delta_buf, delta_len);
1491 else if (err->code != GOT_ERR_NO_SPACE) {
1497 err = got_delta_get_sizes(&base_size, &result_size,
1498 delta_buf, delta_len);
1504 if (base_size > max_size)
1505 max_size = base_size;
1506 if (result_size > max_size)
1507 max_size = result_size;
1509 if (base_buf && max_size > max_bufsize) {
1510 /* Switch from buffers to temporary files. */
1511 size_t w = fwrite(base_buf, 1, base_bufsz,
1513 if (w != base_bufsz) {
1514 err = got_ferror(outfile, GOT_ERR_IO);
1525 if (base_buf && max_size > base_bufsz) {
1526 uint8_t *p = realloc(base_buf, max_size);
1528 err = got_error_from_errno("realloc");
1534 base_bufsz = max_size;
1537 if (accum_buf && max_size > accum_bufsz) {
1538 uint8_t *p = realloc(accum_buf, max_size);
1540 err = got_error_from_errno("realloc");
1546 accum_bufsz = max_size;
1550 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1551 delta_buf, delta_len, accum_buf,
1552 &accum_size, max_size);
1555 err = got_delta_apply(base_file, delta_buf,
1557 /* Final delta application writes to output file. */
1558 ++n < deltas->nentries ? accum_file : outfile,
1566 if (n < deltas->nentries) {
1567 /* Accumulated delta becomes the new base. */
1569 uint8_t *tmp = accum_buf;
1570 size_t tmp_size = accum_bufsz;
1571 accum_buf = base_buf;
1572 accum_bufsz = base_bufsz;
1574 base_bufsz = tmp_size;
1576 FILE *tmp = accum_file;
1577 accum_file = base_file;
1588 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1590 if (len != accum_size)
1591 err = got_ferror(outfile, GOT_ERR_IO);
1595 *result_size = accum_size;
1599 const struct got_error *
1600 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1601 struct got_delta_chain *deltas, struct got_pack *pack)
1603 const struct got_error *err = NULL;
1604 struct got_delta *delta;
1605 uint8_t *base_buf = NULL, *accum_buf = NULL;
1606 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1607 uint64_t max_size = 0;
1613 if (STAILQ_EMPTY(&deltas->entries))
1614 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1616 /* Deltas are ordered in ascending order. */
1617 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1618 uint8_t *delta_buf = NULL;
1619 uint64_t base_size, result_size = 0;
1622 off_t delta_data_offset;
1624 /* Plain object types are the delta base. */
1625 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1626 delta->type != GOT_OBJ_TYPE_TREE &&
1627 delta->type != GOT_OBJ_TYPE_BLOB &&
1628 delta->type != GOT_OBJ_TYPE_TAG) {
1629 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1633 delta_data_offset = delta->offset + delta->tslen;
1634 if (delta_data_offset >= pack->filesize) {
1635 err = got_error(GOT_ERR_PACK_OFFSET);
1639 if (delta->size > max_size)
1640 max_size = delta->size;
1645 if (delta_data_offset > SIZE_MAX) {
1646 return got_error_fmt(GOT_ERR_RANGE,
1647 "delta %lld offset would "
1649 (long long)delta_data_offset);
1652 mapoff = delta_data_offset;
1653 err = got_inflate_to_mem_mmap(&base_buf,
1654 &base_bufsz, NULL, NULL, pack->map,
1655 mapoff, pack->filesize - mapoff);
1657 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1659 err = got_error_from_errno("lseek");
1662 err = got_inflate_to_mem_fd(&base_buf,
1663 &base_bufsz, NULL, NULL, max_size,
1672 if (pack->delta_cache) {
1673 got_delta_cache_get(&delta_buf, &delta_len,
1674 pack->delta_cache, delta->data_offset);
1676 if (delta_buf == NULL) {
1678 err = read_delta_data(&delta_buf, &delta_len, NULL,
1679 delta->data_offset, pack);
1683 if (pack->delta_cache && !cached) {
1684 err = got_delta_cache_add(pack->delta_cache,
1685 delta->data_offset, delta_buf, delta_len);
1688 else if (err->code != GOT_ERR_NO_SPACE) {
1694 err = got_delta_get_sizes(&base_size, &result_size,
1695 delta_buf, delta_len);
1701 if (base_size > max_size)
1702 max_size = base_size;
1703 if (result_size > max_size)
1704 max_size = result_size;
1706 if (max_size > base_bufsz) {
1707 uint8_t *p = realloc(base_buf, max_size);
1709 err = got_error_from_errno("realloc");
1715 base_bufsz = max_size;
1718 if (max_size > accum_bufsz) {
1719 uint8_t *p = realloc(accum_buf, max_size);
1721 err = got_error_from_errno("realloc");
1727 accum_bufsz = max_size;
1730 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1731 delta_buf, delta_len, accum_buf,
1732 &accum_size, max_size);
1739 if (n < deltas->nentries) {
1740 /* Accumulated delta becomes the new base. */
1741 uint8_t *tmp = accum_buf;
1742 size_t tmp_size = accum_bufsz;
1743 accum_buf = base_buf;
1744 accum_bufsz = base_bufsz;
1746 base_bufsz = tmp_size;
1757 *outbuf = accum_buf;
1758 *outlen = accum_size;
1763 const struct got_error *
1764 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1765 FILE *outfile, FILE *base_file, FILE *accum_file)
1767 const struct got_error *err = NULL;
1769 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1770 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1772 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1773 if (obj->pack_offset >= pack->filesize)
1774 return got_error(GOT_ERR_PACK_OFFSET);
1779 if (obj->pack_offset > SIZE_MAX) {
1780 return got_error_fmt(GOT_ERR_RANGE,
1781 "pack offset %lld would overflow size_t",
1782 (long long)obj->pack_offset);
1785 mapoff = obj->pack_offset;
1786 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1787 pack->map, mapoff, pack->filesize - mapoff,
1790 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1791 return got_error_from_errno("lseek");
1792 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1796 err = got_pack_dump_delta_chain_to_file(&obj->size,
1797 &obj->deltas, pack, outfile, base_file, accum_file);
1802 const struct got_error *
1803 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1804 struct got_object *obj, struct got_pack *pack)
1806 const struct got_error *err = NULL;
1808 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1809 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1811 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1812 if (obj->pack_offset >= pack->filesize)
1813 return got_error(GOT_ERR_PACK_OFFSET);
1817 if (obj->pack_offset > SIZE_MAX) {
1818 return got_error_fmt(GOT_ERR_RANGE,
1819 "pack offset %lld would overflow size_t",
1820 (long long)obj->pack_offset);
1823 mapoff = obj->pack_offset;
1824 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1825 pack->map, mapoff, pack->filesize - mapoff);
1827 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1828 return got_error_from_errno("lseek");
1829 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1830 obj->size, pack->fd);
1833 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1839 static const struct got_error *
1840 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1841 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1842 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1844 const struct got_error *err = NULL;
1846 /* Validate decompression and obtain the decompressed size. */
1847 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1848 delta_data_offset, pack);
1852 /* Read delta base/result sizes from head of delta stream. */
1853 err = got_delta_get_sizes(base_size, result_size,
1854 *delta_buf, *delta_len);
1858 /* Discard decompressed delta and read it again in compressed form. */
1860 *delta_buf = malloc(*delta_len_compressed);
1861 if (*delta_buf == NULL) {
1862 err = got_error_from_errno("malloc");
1866 if (delta_data_offset >= pack->filesize) {
1867 err = got_error(GOT_ERR_PACK_OFFSET);
1870 memcpy(*delta_buf, pack->map + delta_data_offset,
1871 *delta_len_compressed);
1874 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1875 err = got_error_from_errno("lseek");
1878 n = read(pack->fd, *delta_buf, *delta_len_compressed);
1880 err = got_error_from_errno("read");
1882 } else if (n != *delta_len_compressed) {
1883 err = got_error(GOT_ERR_IO);
1892 *delta_len_compressed = 0;
1899 const struct got_error *
1900 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1901 size_t *delta_compressed_size, off_t *delta_offset,
1902 off_t *delta_data_offset, off_t *base_offset,
1903 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1904 struct got_pack *pack, struct got_packidx *packidx, int idx)
1906 const struct got_error *err = NULL;
1910 size_t tslen, delta_hdrlen;
1914 *delta_compressed_size = 0;
1916 *delta_data_offset = 0;
1921 offset = got_packidx_get_object_offset(packidx, idx);
1923 return got_error(GOT_ERR_BAD_PACKIDX);
1925 if (offset >= pack->filesize)
1926 return got_error(GOT_ERR_PACK_OFFSET);
1928 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1933 if (tslen + size < tslen || offset + size < size ||
1934 tslen + offset < tslen)
1935 return got_error(GOT_ERR_PACK_OFFSET);
1938 case GOT_OBJ_TYPE_OFFSET_DELTA:
1939 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1940 pack, offset, tslen);
1944 case GOT_OBJ_TYPE_REF_DELTA:
1945 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1948 delta_hdrlen = SHA1_DIGEST_LENGTH;
1951 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1952 "non-delta object type %d found at offset %lld",
1953 type, (long long)offset);
1956 if (tslen + delta_hdrlen < delta_hdrlen ||
1957 offset + delta_hdrlen < delta_hdrlen)
1958 return got_error(GOT_ERR_BAD_DELTA);
1960 *delta_data_offset = offset + tslen + delta_hdrlen;
1961 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1962 base_size, result_size, *delta_data_offset, pack, packidx);
1966 if (*delta_size != size) {
1967 err = got_error(GOT_ERR_BAD_DELTA);
1971 *delta_offset = offset;
1977 *delta_compressed_size = 0;