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 struct got_packidx_v2_hdr *h;
79 uint8_t hash[GOT_OBJECT_ID_MAXLEN];
80 size_t nobj, len_fanout, len_ids, offset, remain;
84 got_hash_init(&ctx, p->algo);
90 if (remain < sizeof(*h->magic)) {
91 err = got_error(GOT_ERR_BAD_PACKIDX);
95 h->magic = (uint32_t *)(p->map + offset);
97 h->magic = malloc(sizeof(*h->magic));
98 if (h->magic == NULL) {
99 err = got_error_from_errno("malloc");
102 n = read(p->fd, h->magic, sizeof(*h->magic));
104 err = got_error_from_errno("read");
106 } else if (n != sizeof(*h->magic)) {
107 err = got_error(GOT_ERR_BAD_PACKIDX);
111 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
112 err = got_error(GOT_ERR_BAD_PACKIDX);
115 offset += sizeof(*h->magic);
116 remain -= sizeof(*h->magic);
119 got_hash_update(&ctx, h->magic, sizeof(*h->magic));
121 if (remain < sizeof(*h->version)) {
122 err = got_error(GOT_ERR_BAD_PACKIDX);
126 h->version = (uint32_t *)(p->map + offset);
128 h->version = malloc(sizeof(*h->version));
129 if (h->version == NULL) {
130 err = got_error_from_errno("malloc");
133 n = read(p->fd, h->version, sizeof(*h->version));
135 err = got_error_from_errno("read");
137 } else if (n != sizeof(*h->version)) {
138 err = got_error(GOT_ERR_BAD_PACKIDX);
142 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
143 err = got_error(GOT_ERR_BAD_PACKIDX);
146 offset += sizeof(*h->version);
147 remain -= sizeof(*h->version);
150 got_hash_update(&ctx, h->version, sizeof(*h->version));
153 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
154 if (remain < len_fanout) {
155 err = got_error(GOT_ERR_BAD_PACKIDX);
159 h->fanout_table = (uint32_t *)(p->map + offset);
161 h->fanout_table = malloc(len_fanout);
162 if (h->fanout_table == NULL) {
163 err = got_error_from_errno("malloc");
166 n = read(p->fd, h->fanout_table, len_fanout);
168 err = got_error_from_errno("read");
170 } else if (n != len_fanout) {
171 err = got_error(GOT_ERR_BAD_PACKIDX);
175 err = verify_fanout_table(h->fanout_table);
179 got_hash_update(&ctx, h->fanout_table, len_fanout);
180 offset += len_fanout;
181 remain -= len_fanout;
183 nobj = be32toh(h->fanout_table[0xff]);
184 len_ids = nobj * got_hash_digest_length(p->algo);
185 if (len_ids <= nobj || len_ids > remain) {
186 err = got_error(GOT_ERR_BAD_PACKIDX);
190 h->sorted_ids = 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 got_hash_update(&ctx, 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 got_hash_update(&ctx, 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 got_hash_update(&ctx, h->offsets, nobj * sizeof(*h->offsets));
257 remain -= nobj * sizeof(*h->offsets);
258 offset += nobj * sizeof(*h->offsets);
260 /* Large file offsets are contained only in files > 2GB. */
261 if (verify || packfile_size > 0x7fffffff) {
262 for (i = 0; i < nobj; i++) {
263 uint32_t o = h->offsets[i];
264 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
268 if (p->nlargeobj == 0)
270 else if (packfile_size <= 0x7fffffff) {
271 err = got_error(GOT_ERR_BAD_PACKIDX);
275 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
276 err = got_error(GOT_ERR_BAD_PACKIDX);
280 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
282 h->large_offsets = malloc(p->nlargeobj *
283 sizeof(*h->large_offsets));
284 if (h->large_offsets == NULL) {
285 err = got_error_from_errno("malloc");
288 n = read(p->fd, h->large_offsets,
289 p->nlargeobj * sizeof(*h->large_offsets));
291 err = got_error_from_errno("read");
292 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
293 err = got_error(GOT_ERR_BAD_PACKIDX);
298 got_hash_update(&ctx, h->large_offsets,
299 p->nlargeobj * sizeof(*h->large_offsets));
300 remain -= p->nlargeobj * sizeof(*h->large_offsets);
301 offset += p->nlargeobj * sizeof(*h->large_offsets);
304 if (remain < 2 * got_hash_digest_length(p->algo)) {
305 err = got_error(GOT_ERR_BAD_PACKIDX);
309 const uint8_t *base = p->map + offset;
311 memcpy(&h->trailer.packfile_hash, base,
312 got_hash_digest_length(p->algo));
313 base += got_hash_digest_length(p->algo);
314 memcpy(&h->trailer.packidx_hash, base,
315 got_hash_digest_length(p->algo));
318 n = read(p->fd, &h->trailer.packfile_hash,
319 got_hash_digest_length(p->algo));
321 err = got_error_from_errno("read");
322 else if (n != got_hash_digest_length(p->algo))
323 err = got_error(GOT_ERR_BAD_PACKIDX);
327 n = read(p->fd, &h->trailer.packidx_hash,
328 got_hash_digest_length(p->algo));
330 err = got_error_from_errno("read");
331 else if (n != got_hash_digest_length(p->algo))
332 err = got_error(GOT_ERR_BAD_PACKIDX);
337 got_hash_update(&ctx, h->trailer.packfile_hash,
338 got_hash_digest_length(p->algo));
339 got_hash_final(&ctx, hash);
340 if (got_hash_cmp(&ctx, hash, h->trailer.packidx_hash) != 0)
341 err = got_error(GOT_ERR_PACKIDX_CSUM);
347 const struct got_error *
348 got_packidx_open(struct got_packidx **packidx,
349 int dir_fd, const char *relpath, int verify,
350 enum got_hash_algorithm algo)
352 const struct got_error *err = NULL;
353 struct got_packidx *p = NULL;
355 struct stat idx_sb, pack_sb;
359 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
364 * Ensure that a corresponding pack file exists.
365 * Some Git repositories have this problem. Git seems to ignore
366 * the existence of lonely pack index files but we do not.
368 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
369 if (errno == ENOENT) {
370 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
373 err = got_error_from_errno2("fstatat", pack_relpath);
377 p = calloc(1, sizeof(*p));
379 err = got_error_from_errno("calloc");
385 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
387 err = got_error_from_errno2("openat", relpath);
391 if (fstat(p->fd, &idx_sb) != 0) {
392 err = got_error_from_errno2("fstat", relpath);
395 p->len = idx_sb.st_size;
396 if (p->len < sizeof(p->hdr)) {
397 err = got_error(GOT_ERR_BAD_PACKIDX);
401 p->path_packidx = strdup(relpath);
402 if (p->path_packidx == NULL) {
403 err = got_error_from_errno("strdup");
407 #ifndef GOT_PACK_NO_MMAP
408 if (p->len > 0 && p->len <= SIZE_MAX) {
409 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
410 if (p->map == MAP_FAILED) {
411 if (errno != ENOMEM) {
412 err = got_error_from_errno("mmap");
415 p->map = NULL; /* fall back to read(2) */
420 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
424 got_packidx_close(p);
431 const struct got_error *
432 got_packidx_close(struct got_packidx *packidx)
434 const struct got_error *err = NULL;
436 free(packidx->path_packidx);
438 if (munmap(packidx->map, packidx->len) == -1)
439 err = got_error_from_errno("munmap");
441 free(packidx->hdr.magic);
442 free(packidx->hdr.version);
443 free(packidx->hdr.fanout_table);
444 free(packidx->hdr.sorted_ids);
445 free(packidx->hdr.crc32);
446 free(packidx->hdr.offsets);
447 free(packidx->hdr.large_offsets);
449 if (close(packidx->fd) == -1 && err == NULL)
450 err = got_error_from_errno("close");
451 free(packidx->sorted_offsets);
452 free(packidx->sorted_large_offsets);
458 static const struct got_error *
459 packfile_path(char **path_packfile, const char *path_packidx)
463 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
464 size = strlen(path_packidx) + 2;
465 if (size < GOT_PACKFILE_NAMELEN + 1)
466 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
468 *path_packfile = malloc(size);
469 if (*path_packfile == NULL)
470 return got_error_from_errno("malloc");
472 /* Copy up to and excluding ".idx". */
473 if (strlcpy(*path_packfile, path_packidx,
474 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
475 return got_error(GOT_ERR_NO_SPACE);
477 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
478 return got_error(GOT_ERR_NO_SPACE);
483 const struct got_error *
484 got_packidx_get_packfile_path(char **path_packfile, const char *path)
486 const struct got_error *err;
488 err = packfile_path(path_packfile, path);
490 fprintf(stderr, "%s: failed for path %s: %s\n",
491 __func__, path, err->msg);
497 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
499 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
500 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
502 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
503 if (idx < 0 || idx >= packidx->nlargeobj ||
504 packidx->hdr.large_offsets == NULL)
506 loffset = be64toh(packidx->hdr.large_offsets[idx]);
507 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
509 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
513 got_packidx_get_object_idx(struct got_packidx *packidx,
514 struct got_object_id *id)
516 u_int8_t id0 = id->hash[0];
517 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
518 int left = 0, right = totobj - 1;
521 idlen = got_hash_digest_length(packidx->algo);
524 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
526 while (left <= right) {
527 struct got_packidx_object_id *oid;
530 i = ((left + right) / 2);
531 oid = packidx->hdr.sorted_ids + idlen * i;
532 cmp = memcmp(id->hash, oid->hash, idlen);
545 offset_cmp(const void *pa, const void *pb)
547 const struct got_pack_offset_index *a, *b;
549 a = (const struct got_pack_offset_index *)pa;
550 b = (const struct got_pack_offset_index *)pb;
552 if (a->offset < b->offset)
554 else if (a->offset > b->offset)
561 large_offset_cmp(const void *pa, const void *pb)
563 const struct got_pack_large_offset_index *a, *b;
565 a = (const struct got_pack_large_offset_index *)pa;
566 b = (const struct got_pack_large_offset_index *)pb;
568 if (a->offset < b->offset)
570 else if (a->offset > b->offset)
576 static const struct got_error *
577 build_offset_index(struct got_packidx *p)
579 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
580 unsigned int i, j, k;
582 p->sorted_offsets = calloc(nobj - p->nlargeobj,
583 sizeof(p->sorted_offsets[0]));
584 if (p->sorted_offsets == NULL)
585 return got_error_from_errno("calloc");
587 if (p->nlargeobj > 0) {
588 p->sorted_large_offsets = calloc(p->nlargeobj,
589 sizeof(p->sorted_large_offsets[0]));
590 if (p->sorted_large_offsets == NULL)
591 return got_error_from_errno("calloc");
596 for (i = 0; i < nobj; i++) {
597 uint32_t offset = be32toh(p->hdr.offsets[i]);
598 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
601 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
602 if (idx >= p->nlargeobj ||
604 p->hdr.large_offsets == NULL)
605 return got_error(GOT_ERR_BAD_PACKIDX);
606 loffset = be64toh(p->hdr.large_offsets[idx]);
607 p->sorted_large_offsets[j].offset = loffset;
608 p->sorted_large_offsets[j].idx = i;
611 p->sorted_offsets[k].offset = offset;
612 p->sorted_offsets[k].idx = i;
616 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
617 return got_error(GOT_ERR_BAD_PACKIDX);
619 qsort(p->sorted_offsets, nobj - p->nlargeobj,
620 sizeof(p->sorted_offsets[0]), offset_cmp);
622 if (p->sorted_large_offsets)
623 qsort(p->sorted_large_offsets, p->nlargeobj,
624 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
629 const struct got_error *
630 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
632 const struct got_error *err;
633 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
638 if (packidx->sorted_offsets == NULL) {
639 err = build_offset_index(packidx);
644 if (offset >= 0x7fffffff) {
646 left = 0, right = packidx->nlargeobj - 1;
647 while (left <= right) {
648 i = ((left + right) / 2);
649 lo = packidx->sorted_large_offsets[i].offset;
651 *idx = packidx->sorted_large_offsets[i].idx;
653 } else if (offset > lo)
655 else if (offset < lo)
660 left = 0, right = totobj - packidx->nlargeobj - 1;
661 while (left <= right) {
662 i = ((left + right) / 2);
663 o = packidx->sorted_offsets[i].offset;
665 *idx = packidx->sorted_offsets[i].idx;
667 } else if (offset > o)
677 const struct got_error *
678 got_packidx_get_object_id(struct got_object_id *id,
679 struct got_packidx *packidx, int idx)
681 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
682 struct got_packidx_object_id *oid;
685 idlen = got_hash_digest_length(packidx->algo);
687 if (idx < 0 || idx >= totobj)
688 return got_error(GOT_ERR_NO_OBJ);
690 oid = packidx->hdr.sorted_ids + (idx * idlen);
692 memset(id, 0, sizeof(*id));
693 memcpy(id->hash, oid->hash, idlen);
697 const struct got_error *
698 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
699 struct got_packidx *packidx, const char *id_str_prefix)
701 const struct got_error *err = NULL;
703 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
705 size_t idlen, prefix_len = strlen(id_str_prefix);
706 struct got_packidx_object_id *oid;
709 idlen = got_hash_digest_length(packidx->algo);
711 STAILQ_INIT(matched_ids);
714 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
716 hex[0] = id_str_prefix[0];
717 hex[1] = id_str_prefix[1];
719 if (!got_parse_xdigit(&id0, hex))
720 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
723 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
724 oid = packidx->hdr.sorted_ids + i * idlen;
725 while (i < totobj && oid->hash[0] == id0) {
726 char id_str[GOT_OBJECT_ID_HEX_MAXLEN];
727 struct got_object_qid *qid;
730 if (!got_hash_digest_to_str(oid->hash, id_str, sizeof(id_str),
732 return got_error(GOT_ERR_NO_SPACE);
734 cmp = strncmp(id_str, id_str_prefix, prefix_len);
737 oid = packidx->hdr.sorted_ids + i * idlen;
742 err = got_object_qid_alloc_partial(&qid);
745 memcpy(qid->id.hash, oid->hash, idlen);
746 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
749 oid = packidx->hdr.sorted_ids + i * idlen;
753 got_object_id_queue_free(matched_ids);
758 set_max_datasize(void)
762 if (getrlimit(RLIMIT_DATA, &rl) != 0)
765 rl.rlim_cur = rl.rlim_max;
766 setrlimit(RLIMIT_DATA, &rl);
769 const struct got_error *
770 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
772 const struct got_error *err = NULL;
775 struct imsgbuf *ibuf;
777 ibuf = calloc(1, sizeof(*ibuf));
779 return got_error_from_errno("calloc");
781 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
782 if (pack->privsep_child == NULL) {
783 err = got_error_from_errno("calloc");
787 pack->child_has_tempfiles = 0;
788 pack->child_has_delta_outfd = 0;
790 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
791 err = got_error_from_errno("socketpair");
797 err = got_error_from_errno("fork");
799 } else if (pid == 0) {
801 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
802 pack->path_packfile);
806 if (close(imsg_fds[1]) == -1)
807 return got_error_from_errno("close");
808 pack->privsep_child->imsg_fd = imsg_fds[0];
809 pack->privsep_child->pid = pid;
810 imsg_init(ibuf, imsg_fds[0]);
811 pack->privsep_child->ibuf = ibuf;
813 err = got_privsep_init_pack_child(ibuf, pack, packidx);
815 const struct got_error *child_err;
816 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
817 child_err = got_privsep_wait_for_child(
818 pack->privsep_child->pid);
819 if (child_err && err == NULL)
825 free(pack->privsep_child);
826 pack->privsep_child = NULL;
831 static const struct got_error *
832 pack_stop_privsep_child(struct got_pack *pack)
834 const struct got_error *err = NULL, *close_err = NULL;
836 if (pack->privsep_child == NULL)
839 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
842 if (close(pack->privsep_child->imsg_fd) == -1)
843 close_err = got_error_from_errno("close");
844 err = got_privsep_wait_for_child(pack->privsep_child->pid);
845 if (close_err && err == NULL)
847 imsg_clear(pack->privsep_child->ibuf);
848 free(pack->privsep_child->ibuf);
849 free(pack->privsep_child);
850 pack->privsep_child = NULL;
854 const struct got_error *
855 got_pack_close(struct got_pack *pack)
857 const struct got_error *err = NULL;
859 err = pack_stop_privsep_child(pack);
860 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
861 err = got_error_from_errno("munmap");
862 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
863 err = got_error_from_errno("close");
865 free(pack->path_packfile);
866 pack->path_packfile = NULL;
868 if (pack->delta_cache) {
869 got_delta_cache_free(pack->delta_cache);
870 pack->delta_cache = NULL;
874 * Leave accumfd and basefd alone. They are managed by the
875 * repository layer and can be reused.
881 const struct got_error *
882 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
883 struct got_pack *pack, off_t offset)
893 if (offset >= pack->filesize)
894 return got_error(GOT_ERR_PACK_OFFSET);
897 if (offset > SIZE_MAX) {
898 return got_error_fmt(GOT_ERR_PACK_OFFSET,
899 "offset %lld overflows size_t",
903 mapoff = (size_t)offset;
905 if (lseek(pack->fd, offset, SEEK_SET) == -1)
906 return got_error_from_errno("lseek");
910 /* We do not support size values which don't fit in 64 bit. */
912 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
913 "packfile offset %lld", (long long)offset);
916 if (mapoff + sizeof(sizeN) >= pack->filesize)
917 return got_error(GOT_ERR_BAD_PACKFILE);
918 sizeN = *(pack->map + mapoff);
919 mapoff += sizeof(sizeN);
921 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
923 return got_error_from_errno("read");
924 if (n != sizeof(sizeN))
925 return got_error(GOT_ERR_BAD_PACKFILE);
927 *len += sizeof(sizeN);
930 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
931 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
932 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
934 size_t shift = 4 + 7 * (i - 1);
935 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
938 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
945 static const struct got_error *
946 open_plain_object(struct got_object **obj, struct got_object_id *id,
947 uint8_t type, off_t offset, size_t size, int idx)
949 *obj = calloc(1, sizeof(**obj));
951 return got_error_from_errno("calloc");
954 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
955 (*obj)->pack_idx = idx;
958 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
959 (*obj)->pack_offset = offset;
964 static const struct got_error *
965 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
976 /* We do not support offset values which don't fit in 64 bit. */
978 return got_error(GOT_ERR_NO_SPACE);
983 if (delta_offset + *len > SIZE_MAX) {
984 return got_error_fmt(GOT_ERR_PACK_OFFSET,
985 "mapoff %lld would overflow size_t",
986 (long long)delta_offset + *len);
989 mapoff = (size_t)delta_offset + *len;
990 if (mapoff + sizeof(offN) >= pack->filesize)
991 return got_error(GOT_ERR_PACK_OFFSET);
992 offN = *(pack->map + mapoff);
995 n = read(pack->fd, &offN, sizeof(offN));
997 return got_error_from_errno("read");
998 if (n != sizeof(offN))
999 return got_error(GOT_ERR_BAD_PACKFILE);
1001 *len += sizeof(offN);
1004 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
1008 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
1011 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
1017 const struct got_error *
1018 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
1019 struct got_pack *pack, off_t offset, size_t tslen)
1021 const struct got_error *err;
1027 err = parse_negative_offset(&negoffset, &negofflen, pack,
1032 /* Compute the base object's offset (must be in the same pack file). */
1033 *base_offset = (offset - negoffset);
1034 if (*base_offset <= 0)
1035 return got_error(GOT_ERR_BAD_PACKFILE);
1041 static const struct got_error *
1042 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1043 size_t *delta_compressed_len, size_t delta_data_offset,
1044 struct got_pack *pack)
1046 const struct got_error *err = NULL;
1047 size_t consumed = 0;
1050 if (delta_data_offset >= pack->filesize)
1051 return got_error(GOT_ERR_PACK_OFFSET);
1052 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1053 &consumed, NULL, pack->map, delta_data_offset,
1054 pack->filesize - delta_data_offset);
1058 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1059 return got_error_from_errno("lseek");
1060 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1061 &consumed, NULL, 0, pack->fd);
1066 if (delta_compressed_len)
1067 *delta_compressed_len = consumed;
1072 static const struct got_error *
1073 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1074 int delta_type, size_t delta_size, off_t delta_data_offset)
1076 struct got_delta *delta;
1078 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1081 return got_error_from_errno("got_delta_open");
1082 /* delta is freed in got_object_close() */
1084 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1088 static const struct got_error *
1089 resolve_offset_delta(struct got_delta_chain *deltas,
1090 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1091 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1093 const struct got_error *err;
1098 off_t delta_data_offset;
1101 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1102 delta_offset, tslen);
1106 delta_data_offset = delta_offset + tslen + consumed;
1107 if (delta_data_offset >= pack->filesize)
1108 return got_error(GOT_ERR_PACK_OFFSET);
1110 if (pack->map == NULL) {
1111 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1112 if (delta_data_offset == -1)
1113 return got_error_from_errno("lseek");
1116 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1121 /* An offset delta must be in the same packfile. */
1122 if (base_offset >= pack->filesize)
1123 return got_error(GOT_ERR_PACK_OFFSET);
1125 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1126 &base_tslen, pack, base_offset);
1130 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1131 base_tslen, base_type, base_size, recursion - 1);
1134 const struct got_error *
1135 got_pack_parse_ref_delta(struct got_object_id *id,
1136 struct got_pack *pack, off_t delta_offset, int tslen)
1140 idlen = got_hash_digest_length(pack->algo);
1141 memset(id, 0, sizeof(*id));
1146 if (delta_offset + tslen > SIZE_MAX) {
1147 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1148 "mapoff %lld would overflow size_t",
1149 (long long)delta_offset + tslen);
1152 mapoff = delta_offset + tslen;
1153 if (mapoff + idlen >= pack->filesize)
1154 return got_error(GOT_ERR_PACK_OFFSET);
1155 memcpy(id->hash, pack->map + mapoff, idlen);
1158 n = read(pack->fd, id->hash, idlen);
1160 return got_error_from_errno("read");
1161 if (n != sizeof(*id))
1162 return got_error(GOT_ERR_BAD_PACKFILE);
1168 static const struct got_error *
1169 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1170 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1171 size_t delta_size, unsigned int recursion)
1173 const struct got_error *err;
1174 struct got_object_id id;
1180 off_t delta_data_offset;
1182 if (delta_offset + tslen >= pack->filesize)
1183 return got_error(GOT_ERR_PACK_OFFSET);
1185 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1189 delta_data_offset = delta_offset + tslen + sizeof(id);
1191 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1192 if (delta_data_offset == -1)
1193 return got_error_from_errno("lseek");
1196 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1201 /* Delta base must be in the same pack file. */
1202 idx = got_packidx_get_object_idx(packidx, &id);
1204 return got_error(GOT_ERR_NO_OBJ);
1206 base_offset = got_packidx_get_object_offset(packidx, idx);
1207 if (base_offset == -1)
1208 return got_error(GOT_ERR_BAD_PACKIDX);
1210 if (base_offset >= pack->filesize)
1211 return got_error(GOT_ERR_PACK_OFFSET);
1213 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1214 &base_tslen, pack, base_offset);
1218 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1219 base_tslen, base_type, base_size, recursion - 1);
1222 const struct got_error *
1223 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1224 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1225 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1227 const struct got_error *err = NULL;
1229 if (--recursion == 0)
1230 return got_error(GOT_ERR_RECURSION);
1232 switch (delta_type) {
1233 case GOT_OBJ_TYPE_COMMIT:
1234 case GOT_OBJ_TYPE_TREE:
1235 case GOT_OBJ_TYPE_BLOB:
1236 case GOT_OBJ_TYPE_TAG:
1237 /* Plain types are the final delta base. Recursion ends. */
1238 err = add_delta(deltas, delta_offset, tslen, delta_type,
1241 case GOT_OBJ_TYPE_OFFSET_DELTA:
1242 err = resolve_offset_delta(deltas, packidx, pack,
1243 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1245 case GOT_OBJ_TYPE_REF_DELTA:
1246 err = resolve_ref_delta(deltas, packidx, pack,
1247 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1250 return got_error(GOT_ERR_OBJ_TYPE);
1256 static const struct got_error *
1257 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1258 struct got_pack *pack, struct got_object_id *id, off_t offset,
1259 size_t tslen, int delta_type, size_t delta_size, int idx)
1261 const struct got_error *err = NULL;
1264 *obj = calloc(1, sizeof(**obj));
1266 return got_error_from_errno("calloc");
1270 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1271 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1272 (*obj)->pack_offset = offset + tslen;
1274 STAILQ_INIT(&(*obj)->deltas.entries);
1275 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1276 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1277 (*obj)->pack_idx = idx;
1279 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1280 offset, tslen, delta_type, delta_size,
1281 GOT_DELTA_CHAIN_RECURSION_MAX);
1285 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1288 (*obj)->type = resolved_type;
1291 got_object_close(*obj);
1297 const struct got_error *
1298 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1299 struct got_packidx *packidx, int idx, struct got_object_id *id)
1301 const struct got_error *err = NULL;
1309 offset = got_packidx_get_object_offset(packidx, idx);
1311 return got_error(GOT_ERR_BAD_PACKIDX);
1313 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1319 case GOT_OBJ_TYPE_COMMIT:
1320 case GOT_OBJ_TYPE_TREE:
1321 case GOT_OBJ_TYPE_BLOB:
1322 case GOT_OBJ_TYPE_TAG:
1323 err = open_plain_object(obj, id, type, offset + tslen,
1326 case GOT_OBJ_TYPE_OFFSET_DELTA:
1327 case GOT_OBJ_TYPE_REF_DELTA:
1328 err = open_delta_object(obj, packidx, pack, id, offset,
1329 tslen, type, size, idx);
1332 err = got_error(GOT_ERR_OBJ_TYPE);
1339 const struct got_error *
1340 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1341 struct got_delta_chain *deltas, struct got_pack *pack)
1343 struct got_delta *delta;
1344 uint64_t base_size = 0, result_size = 0;
1347 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1348 /* Plain object types are the delta base. */
1349 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1350 delta->type != GOT_OBJ_TYPE_TREE &&
1351 delta->type != GOT_OBJ_TYPE_BLOB &&
1352 delta->type != GOT_OBJ_TYPE_TAG) {
1353 const struct got_error *err;
1354 uint8_t *delta_buf = NULL;
1358 if (pack->delta_cache) {
1359 got_delta_cache_get(&delta_buf, &delta_len,
1360 pack->delta_cache, delta->data_offset);
1362 if (delta_buf == NULL) {
1364 err = read_delta_data(&delta_buf, &delta_len,
1365 NULL, delta->data_offset, pack);
1369 if (pack->delta_cache && !cached) {
1370 err = got_delta_cache_add(pack->delta_cache,
1371 delta->data_offset, delta_buf, delta_len);
1374 else if (err->code != GOT_ERR_NO_SPACE) {
1379 err = got_delta_get_sizes(&base_size, &result_size,
1380 delta_buf, delta_len);
1386 base_size = delta->size;
1387 if (base_size > *max_size)
1388 *max_size = base_size;
1389 if (result_size > *max_size)
1390 *max_size = result_size;
1396 const struct got_error *
1397 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1398 struct got_pack *pack)
1400 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1401 return got_error(GOT_ERR_OBJ_TYPE);
1403 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1406 const struct got_error *
1407 got_pack_dump_delta_chain_to_file(size_t *result_size,
1408 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1409 FILE *base_file, FILE *accum_file)
1411 const struct got_error *err = NULL;
1412 struct got_delta *delta;
1413 uint8_t *base_buf = NULL, *accum_buf = NULL;
1414 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1415 /* We process small enough files entirely in memory for speed. */
1416 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1417 uint64_t max_size = 0;
1422 if (STAILQ_EMPTY(&deltas->entries))
1423 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1425 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1426 return got_error_from_errno("fseeko");
1427 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1428 return got_error_from_errno("fseeko");
1430 /* Deltas are ordered in ascending order. */
1431 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1432 uint8_t *delta_buf = NULL;
1433 uint64_t base_size, result_size = 0;
1437 off_t delta_data_offset;
1439 /* Plain object types are the delta base. */
1440 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1441 delta->type != GOT_OBJ_TYPE_TREE &&
1442 delta->type != GOT_OBJ_TYPE_BLOB &&
1443 delta->type != GOT_OBJ_TYPE_TAG) {
1444 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1448 delta_data_offset = delta->offset + delta->tslen;
1449 if (delta_data_offset >= pack->filesize) {
1450 err = got_error(GOT_ERR_PACK_OFFSET);
1453 if (pack->map == NULL) {
1454 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1456 err = got_error_from_errno("lseek");
1460 if (delta->size > max_size)
1461 max_size = delta->size;
1462 if (max_size > max_bufsize) {
1464 if (delta_data_offset > SIZE_MAX) {
1465 return got_error_fmt(
1467 "delta offset %lld "
1473 mapoff = delta_data_offset;
1474 err = got_inflate_to_file_mmap(
1475 &base_bufsz, NULL, NULL, pack->map,
1476 mapoff, pack->filesize - mapoff,
1479 err = got_inflate_to_file_fd(
1480 &base_bufsz, NULL, NULL, pack->fd,
1483 accum_buf = malloc(max_size);
1484 if (accum_buf == NULL) {
1485 err = got_error_from_errno("malloc");
1488 accum_bufsz = max_size;
1490 if (delta_data_offset > SIZE_MAX) {
1491 return got_error_fmt(
1493 "delta offset %lld "
1499 mapoff = delta_data_offset;
1500 err = got_inflate_to_mem_mmap(&base_buf,
1501 &base_bufsz, NULL, NULL,
1503 pack->filesize - mapoff);
1505 err = got_inflate_to_mem_fd(&base_buf,
1506 &base_bufsz, NULL, NULL, max_size,
1512 if (base_buf == NULL)
1517 if (pack->delta_cache) {
1518 got_delta_cache_get(&delta_buf, &delta_len,
1519 pack->delta_cache, delta->data_offset);
1521 if (delta_buf == NULL) {
1523 err = read_delta_data(&delta_buf, &delta_len, NULL,
1524 delta->data_offset, pack);
1528 if (pack->delta_cache && !cached) {
1529 err = got_delta_cache_add(pack->delta_cache,
1530 delta->data_offset, delta_buf, delta_len);
1533 else if (err->code != GOT_ERR_NO_SPACE) {
1539 err = got_delta_get_sizes(&base_size, &result_size,
1540 delta_buf, delta_len);
1546 if (base_size > max_size)
1547 max_size = base_size;
1548 if (result_size > max_size)
1549 max_size = result_size;
1551 if (base_buf && max_size > max_bufsize) {
1552 /* Switch from buffers to temporary files. */
1553 size_t w = fwrite(base_buf, 1, base_bufsz,
1555 if (w != base_bufsz) {
1556 err = got_ferror(outfile, GOT_ERR_IO);
1567 if (base_buf && max_size > base_bufsz) {
1568 uint8_t *p = realloc(base_buf, max_size);
1570 err = got_error_from_errno("realloc");
1576 base_bufsz = max_size;
1579 if (accum_buf && max_size > accum_bufsz) {
1580 uint8_t *p = realloc(accum_buf, max_size);
1582 err = got_error_from_errno("realloc");
1588 accum_bufsz = max_size;
1592 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1593 delta_buf, delta_len, accum_buf,
1594 &accum_size, max_size);
1597 err = got_delta_apply(base_file, delta_buf,
1599 /* Final delta application writes to output file. */
1600 ++n < deltas->nentries ? accum_file : outfile,
1608 if (n < deltas->nentries) {
1609 /* Accumulated delta becomes the new base. */
1611 uint8_t *tmp = accum_buf;
1612 size_t tmp_size = accum_bufsz;
1613 accum_buf = base_buf;
1614 accum_bufsz = base_bufsz;
1616 base_bufsz = tmp_size;
1618 FILE *tmp = accum_file;
1619 accum_file = base_file;
1630 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1632 if (len != accum_size)
1633 err = got_ferror(outfile, GOT_ERR_IO);
1637 *result_size = accum_size;
1641 const struct got_error *
1642 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1643 struct got_delta_chain *deltas, struct got_pack *pack)
1645 const struct got_error *err = NULL;
1646 struct got_delta *delta;
1647 uint8_t *base_buf = NULL, *accum_buf = NULL;
1648 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1649 uint64_t max_size = 0;
1655 if (STAILQ_EMPTY(&deltas->entries))
1656 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1658 /* Deltas are ordered in ascending order. */
1659 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1660 uint8_t *delta_buf = NULL;
1661 uint64_t base_size, result_size = 0;
1664 off_t delta_data_offset;
1666 /* Plain object types are the delta base. */
1667 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1668 delta->type != GOT_OBJ_TYPE_TREE &&
1669 delta->type != GOT_OBJ_TYPE_BLOB &&
1670 delta->type != GOT_OBJ_TYPE_TAG) {
1671 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1675 delta_data_offset = delta->offset + delta->tslen;
1676 if (delta_data_offset >= pack->filesize) {
1677 err = got_error(GOT_ERR_PACK_OFFSET);
1681 if (delta->size > max_size)
1682 max_size = delta->size;
1687 if (delta_data_offset > SIZE_MAX) {
1688 return got_error_fmt(GOT_ERR_RANGE,
1689 "delta %lld offset would "
1691 (long long)delta_data_offset);
1694 mapoff = delta_data_offset;
1695 err = got_inflate_to_mem_mmap(&base_buf,
1696 &base_bufsz, NULL, NULL, pack->map,
1697 mapoff, pack->filesize - mapoff);
1699 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1701 err = got_error_from_errno("lseek");
1704 err = got_inflate_to_mem_fd(&base_buf,
1705 &base_bufsz, NULL, NULL, max_size,
1714 if (pack->delta_cache) {
1715 got_delta_cache_get(&delta_buf, &delta_len,
1716 pack->delta_cache, delta->data_offset);
1718 if (delta_buf == NULL) {
1720 err = read_delta_data(&delta_buf, &delta_len, NULL,
1721 delta->data_offset, pack);
1725 if (pack->delta_cache && !cached) {
1726 err = got_delta_cache_add(pack->delta_cache,
1727 delta->data_offset, delta_buf, delta_len);
1730 else if (err->code != GOT_ERR_NO_SPACE) {
1736 err = got_delta_get_sizes(&base_size, &result_size,
1737 delta_buf, delta_len);
1743 if (base_size > max_size)
1744 max_size = base_size;
1745 if (result_size > max_size)
1746 max_size = result_size;
1748 if (max_size > base_bufsz) {
1749 uint8_t *p = realloc(base_buf, max_size);
1751 err = got_error_from_errno("realloc");
1757 base_bufsz = max_size;
1760 if (max_size > accum_bufsz) {
1761 uint8_t *p = realloc(accum_buf, max_size);
1763 err = got_error_from_errno("realloc");
1769 accum_bufsz = max_size;
1772 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1773 delta_buf, delta_len, accum_buf,
1774 &accum_size, max_size);
1781 if (n < deltas->nentries) {
1782 /* Accumulated delta becomes the new base. */
1783 uint8_t *tmp = accum_buf;
1784 size_t tmp_size = accum_bufsz;
1785 accum_buf = base_buf;
1786 accum_bufsz = base_bufsz;
1788 base_bufsz = tmp_size;
1799 *outbuf = accum_buf;
1800 *outlen = accum_size;
1805 const struct got_error *
1806 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1807 FILE *outfile, FILE *base_file, FILE *accum_file)
1809 const struct got_error *err = NULL;
1811 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1812 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1814 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1815 if (obj->pack_offset >= pack->filesize)
1816 return got_error(GOT_ERR_PACK_OFFSET);
1821 if (obj->pack_offset > SIZE_MAX) {
1822 return got_error_fmt(GOT_ERR_RANGE,
1823 "pack offset %lld would overflow size_t",
1824 (long long)obj->pack_offset);
1827 mapoff = obj->pack_offset;
1828 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1829 pack->map, mapoff, pack->filesize - mapoff,
1832 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1833 return got_error_from_errno("lseek");
1834 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1838 err = got_pack_dump_delta_chain_to_file(&obj->size,
1839 &obj->deltas, pack, outfile, base_file, accum_file);
1844 const struct got_error *
1845 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1846 struct got_object *obj, struct got_pack *pack)
1848 const struct got_error *err = NULL;
1850 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1851 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1853 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1854 if (obj->pack_offset >= pack->filesize)
1855 return got_error(GOT_ERR_PACK_OFFSET);
1859 if (obj->pack_offset > SIZE_MAX) {
1860 return got_error_fmt(GOT_ERR_RANGE,
1861 "pack offset %lld would overflow size_t",
1862 (long long)obj->pack_offset);
1865 mapoff = obj->pack_offset;
1866 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1867 pack->map, mapoff, pack->filesize - mapoff);
1869 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1870 return got_error_from_errno("lseek");
1871 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1872 obj->size, pack->fd);
1875 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1881 static const struct got_error *
1882 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1883 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1884 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1886 const struct got_error *err = NULL;
1888 /* Validate decompression and obtain the decompressed size. */
1889 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1890 delta_data_offset, pack);
1894 /* Read delta base/result sizes from head of delta stream. */
1895 err = got_delta_get_sizes(base_size, result_size,
1896 *delta_buf, *delta_len);
1900 /* Discard decompressed delta and read it again in compressed form. */
1902 *delta_buf = malloc(*delta_len_compressed);
1903 if (*delta_buf == NULL) {
1904 err = got_error_from_errno("malloc");
1908 if (delta_data_offset >= pack->filesize) {
1909 err = got_error(GOT_ERR_PACK_OFFSET);
1912 memcpy(*delta_buf, pack->map + delta_data_offset,
1913 *delta_len_compressed);
1916 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1917 err = got_error_from_errno("lseek");
1920 n = read(pack->fd, *delta_buf, *delta_len_compressed);
1922 err = got_error_from_errno("read");
1924 } else if (n != *delta_len_compressed) {
1925 err = got_error(GOT_ERR_IO);
1934 *delta_len_compressed = 0;
1941 const struct got_error *
1942 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1943 size_t *delta_compressed_size, off_t *delta_offset,
1944 off_t *delta_data_offset, off_t *base_offset,
1945 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1946 struct got_pack *pack, struct got_packidx *packidx, int idx)
1948 const struct got_error *err = NULL;
1952 size_t tslen, delta_hdrlen;
1956 *delta_compressed_size = 0;
1958 *delta_data_offset = 0;
1963 offset = got_packidx_get_object_offset(packidx, idx);
1965 return got_error(GOT_ERR_BAD_PACKIDX);
1967 if (offset >= pack->filesize)
1968 return got_error(GOT_ERR_PACK_OFFSET);
1970 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1975 if (tslen + size < tslen || offset + size < size ||
1976 tslen + offset < tslen)
1977 return got_error(GOT_ERR_PACK_OFFSET);
1980 case GOT_OBJ_TYPE_OFFSET_DELTA:
1981 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1982 pack, offset, tslen);
1986 case GOT_OBJ_TYPE_REF_DELTA:
1987 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1990 delta_hdrlen = SHA1_DIGEST_LENGTH;
1993 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1994 "non-delta object type %d found at offset %lld",
1995 type, (long long)offset);
1998 if (tslen + delta_hdrlen < delta_hdrlen ||
1999 offset + delta_hdrlen < delta_hdrlen)
2000 return got_error(GOT_ERR_BAD_DELTA);
2002 *delta_data_offset = offset + tslen + delta_hdrlen;
2003 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
2004 base_size, result_size, *delta_data_offset, pack, packidx);
2008 if (*delta_size != size) {
2009 err = got_error(GOT_ERR_BAD_DELTA);
2013 *delta_offset = offset;
2019 *delta_compressed_size = 0;