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>
35 #include "got_error.h"
36 #include "got_object.h"
39 #include "got_lib_sha1.h"
40 #include "got_lib_delta.h"
41 #include "got_lib_delta_cache.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_parse.h"
45 #include "got_lib_privsep.h"
46 #include "got_lib_pack.h"
49 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
53 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
56 static const struct got_error *
57 verify_fanout_table(uint32_t *fanout_table)
61 for (i = 0; i < 0xff - 1; i++) {
62 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
63 return got_error(GOT_ERR_BAD_PACKIDX);
69 const struct got_error *
70 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
72 const struct got_error *err = NULL;
73 struct got_packidx_v2_hdr *h;
75 uint8_t sha1[SHA1_DIGEST_LENGTH];
76 size_t nobj, len_fanout, len_ids, offset, remain;
86 if (remain < sizeof(*h->magic)) {
87 err = got_error(GOT_ERR_BAD_PACKIDX);
91 h->magic = (uint32_t *)(p->map + offset);
93 h->magic = malloc(sizeof(*h->magic));
94 if (h->magic == NULL) {
95 err = got_error_from_errno("malloc");
98 n = read(p->fd, h->magic, sizeof(*h->magic));
100 err = got_error_from_errno("read");
102 } else if (n != sizeof(*h->magic)) {
103 err = got_error(GOT_ERR_BAD_PACKIDX);
107 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
108 err = got_error(GOT_ERR_BAD_PACKIDX);
111 offset += sizeof(*h->magic);
112 remain -= sizeof(*h->magic);
115 SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
117 if (remain < sizeof(*h->version)) {
118 err = got_error(GOT_ERR_BAD_PACKIDX);
122 h->version = (uint32_t *)(p->map + offset);
124 h->version = malloc(sizeof(*h->version));
125 if (h->version == NULL) {
126 err = got_error_from_errno("malloc");
129 n = read(p->fd, h->version, sizeof(*h->version));
131 err = got_error_from_errno("read");
133 } else if (n != sizeof(*h->version)) {
134 err = got_error(GOT_ERR_BAD_PACKIDX);
138 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
139 err = got_error(GOT_ERR_BAD_PACKIDX);
142 offset += sizeof(*h->version);
143 remain -= sizeof(*h->version);
146 SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
149 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
150 if (remain < len_fanout) {
151 err = got_error(GOT_ERR_BAD_PACKIDX);
155 h->fanout_table = (uint32_t *)(p->map + offset);
157 h->fanout_table = malloc(len_fanout);
158 if (h->fanout_table == NULL) {
159 err = got_error_from_errno("malloc");
162 n = read(p->fd, h->fanout_table, len_fanout);
164 err = got_error_from_errno("read");
166 } else if (n != len_fanout) {
167 err = got_error(GOT_ERR_BAD_PACKIDX);
171 err = verify_fanout_table(h->fanout_table);
175 SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
176 offset += len_fanout;
177 remain -= len_fanout;
179 nobj = be32toh(h->fanout_table[0xff]);
180 len_ids = nobj * sizeof(*h->sorted_ids);
181 if (len_ids <= nobj || len_ids > remain) {
182 err = got_error(GOT_ERR_BAD_PACKIDX);
187 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
189 h->sorted_ids = malloc(len_ids);
190 if (h->sorted_ids == NULL) {
191 err = got_error(GOT_ERR_BAD_PACKIDX);
194 n = read(p->fd, h->sorted_ids, len_ids);
196 err = got_error_from_errno("read");
197 else if (n != len_ids) {
198 err = got_error(GOT_ERR_BAD_PACKIDX);
203 SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
207 if (remain < nobj * sizeof(*h->crc32)) {
208 err = got_error(GOT_ERR_BAD_PACKIDX);
212 h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
214 h->crc32 = malloc(nobj * sizeof(*h->crc32));
215 if (h->crc32 == NULL) {
216 err = got_error_from_errno("malloc");
219 n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
221 err = got_error_from_errno("read");
222 else if (n != nobj * sizeof(*h->crc32)) {
223 err = got_error(GOT_ERR_BAD_PACKIDX);
228 SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
229 remain -= nobj * sizeof(*h->crc32);
230 offset += nobj * sizeof(*h->crc32);
232 if (remain < nobj * sizeof(*h->offsets)) {
233 err = got_error(GOT_ERR_BAD_PACKIDX);
237 h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
239 h->offsets = malloc(nobj * sizeof(*h->offsets));
240 if (h->offsets == NULL) {
241 err = got_error_from_errno("malloc");
244 n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
246 err = got_error_from_errno("read");
247 else if (n != nobj * sizeof(*h->offsets)) {
248 err = got_error(GOT_ERR_BAD_PACKIDX);
253 SHA1Update(&ctx, (uint8_t *)h->offsets,
254 nobj * sizeof(*h->offsets));
255 remain -= nobj * sizeof(*h->offsets);
256 offset += nobj * sizeof(*h->offsets);
258 /* Large file offsets are contained only in files > 2GB. */
259 if (verify || packfile_size > 0x7fffffff) {
260 for (i = 0; i < nobj; i++) {
261 uint32_t o = h->offsets[i];
262 if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
266 if (p->nlargeobj == 0)
268 else if (packfile_size <= 0x7fffffff) {
269 err = got_error(GOT_ERR_BAD_PACKIDX);
273 if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
274 err = got_error(GOT_ERR_BAD_PACKIDX);
278 h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
280 h->large_offsets = malloc(p->nlargeobj *
281 sizeof(*h->large_offsets));
282 if (h->large_offsets == NULL) {
283 err = got_error_from_errno("malloc");
286 n = read(p->fd, h->large_offsets,
287 p->nlargeobj * sizeof(*h->large_offsets));
289 err = got_error_from_errno("read");
290 else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
291 err = got_error(GOT_ERR_BAD_PACKIDX);
296 SHA1Update(&ctx, (uint8_t*)h->large_offsets,
297 p->nlargeobj * sizeof(*h->large_offsets));
298 remain -= p->nlargeobj * sizeof(*h->large_offsets);
299 offset += p->nlargeobj * sizeof(*h->large_offsets);
302 if (remain < sizeof(*h->trailer)) {
303 err = got_error(GOT_ERR_BAD_PACKIDX);
308 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
310 h->trailer = malloc(sizeof(*h->trailer));
311 if (h->trailer == NULL) {
312 err = got_error_from_errno("malloc");
315 n = read(p->fd, h->trailer, sizeof(*h->trailer));
317 err = got_error_from_errno("read");
318 else if (n != sizeof(*h->trailer)) {
319 err = got_error(GOT_ERR_BAD_PACKIDX);
324 SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
325 SHA1Final(sha1, &ctx);
326 if (memcmp(h->trailer->packidx_sha1, sha1,
327 SHA1_DIGEST_LENGTH) != 0)
328 err = got_error(GOT_ERR_PACKIDX_CSUM);
334 const struct got_error *
335 got_packidx_open(struct got_packidx **packidx,
336 int dir_fd, const char *relpath, int verify)
338 const struct got_error *err = NULL;
339 struct got_packidx *p = NULL;
341 struct stat idx_sb, pack_sb;
345 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
350 * Ensure that a corresponding pack file exists.
351 * Some Git repositories have this problem. Git seems to ignore
352 * the existence of lonely pack index files but we do not.
354 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
355 if (errno == ENOENT) {
356 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
359 err = got_error_from_errno2("fstatat", pack_relpath);
363 p = calloc(1, sizeof(*p));
365 err = got_error_from_errno("calloc");
369 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
371 err = got_error_from_errno2("openat", relpath);
375 if (fstat(p->fd, &idx_sb) != 0) {
376 err = got_error_from_errno2("fstat", relpath);
379 p->len = idx_sb.st_size;
380 if (p->len < sizeof(p->hdr)) {
381 err = got_error(GOT_ERR_BAD_PACKIDX);
385 p->path_packidx = strdup(relpath);
386 if (p->path_packidx == NULL) {
387 err = got_error_from_errno("strdup");
391 #ifndef GOT_PACK_NO_MMAP
392 if (p->len > 0 && p->len <= SIZE_MAX) {
393 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
394 if (p->map == MAP_FAILED) {
395 if (errno != ENOMEM) {
396 err = got_error_from_errno("mmap");
399 p->map = NULL; /* fall back to read(2) */
404 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
408 got_packidx_close(p);
415 const struct got_error *
416 got_packidx_close(struct got_packidx *packidx)
418 const struct got_error *err = NULL;
420 free(packidx->path_packidx);
422 if (munmap(packidx->map, packidx->len) == -1)
423 err = got_error_from_errno("munmap");
425 free(packidx->hdr.magic);
426 free(packidx->hdr.version);
427 free(packidx->hdr.fanout_table);
428 free(packidx->hdr.sorted_ids);
429 free(packidx->hdr.crc32);
430 free(packidx->hdr.offsets);
431 free(packidx->hdr.large_offsets);
432 free(packidx->hdr.trailer);
434 if (close(packidx->fd) == -1 && err == NULL)
435 err = got_error_from_errno("close");
436 free(packidx->sorted_offsets);
437 free(packidx->sorted_large_offsets);
443 const struct got_error *
444 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
448 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
449 size = strlen(path_packidx) + 2;
450 if (size < GOT_PACKFILE_NAMELEN + 1)
451 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
453 *path_packfile = malloc(size);
454 if (*path_packfile == NULL)
455 return got_error_from_errno("malloc");
457 /* Copy up to and excluding ".idx". */
458 if (strlcpy(*path_packfile, path_packidx,
459 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
460 return got_error(GOT_ERR_NO_SPACE);
462 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
463 return got_error(GOT_ERR_NO_SPACE);
469 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
471 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
472 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
474 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
475 if (idx < 0 || idx >= packidx->nlargeobj ||
476 packidx->hdr.large_offsets == NULL)
478 loffset = be64toh(packidx->hdr.large_offsets[idx]);
479 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
481 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
485 got_packidx_get_object_idx(struct got_packidx *packidx,
486 struct got_object_id *id)
488 u_int8_t id0 = id->sha1[0];
489 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
490 int left = 0, right = totobj - 1;
493 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
495 while (left <= right) {
496 struct got_packidx_object_id *oid;
499 i = ((left + right) / 2);
500 oid = &packidx->hdr.sorted_ids[i];
501 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
514 offset_cmp(const void *pa, const void *pb)
516 const struct got_pack_offset_index *a, *b;
518 a = (const struct got_pack_offset_index *)pa;
519 b = (const struct got_pack_offset_index *)pb;
521 if (a->offset < b->offset)
523 else if (a->offset > b->offset)
530 large_offset_cmp(const void *pa, const void *pb)
532 const struct got_pack_large_offset_index *a, *b;
534 a = (const struct got_pack_large_offset_index *)pa;
535 b = (const struct got_pack_large_offset_index *)pb;
537 if (a->offset < b->offset)
539 else if (a->offset > b->offset)
545 static const struct got_error *
546 build_offset_index(struct got_packidx *p)
548 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
549 unsigned int i, j, k;
551 p->sorted_offsets = calloc(nobj - p->nlargeobj,
552 sizeof(p->sorted_offsets[0]));
553 if (p->sorted_offsets == NULL)
554 return got_error_from_errno("calloc");
556 if (p->nlargeobj > 0) {
557 p->sorted_large_offsets = calloc(p->nlargeobj,
558 sizeof(p->sorted_large_offsets[0]));
559 if (p->sorted_large_offsets == NULL)
560 return got_error_from_errno("calloc");
565 for (i = 0; i < nobj; i++) {
566 uint32_t offset = be32toh(p->hdr.offsets[i]);
567 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
570 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
571 if (idx >= p->nlargeobj ||
573 p->hdr.large_offsets == NULL)
574 return got_error(GOT_ERR_BAD_PACKIDX);
575 loffset = be64toh(p->hdr.large_offsets[idx]);
576 p->sorted_large_offsets[j].offset = loffset;
577 p->sorted_large_offsets[j].idx = i;
580 p->sorted_offsets[k].offset = offset;
581 p->sorted_offsets[k].idx = i;
585 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
586 return got_error(GOT_ERR_BAD_PACKIDX);
588 qsort(p->sorted_offsets, nobj - p->nlargeobj,
589 sizeof(p->sorted_offsets[0]), offset_cmp);
591 if (p->sorted_large_offsets)
592 qsort(p->sorted_large_offsets, p->nlargeobj,
593 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
598 const struct got_error *
599 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
601 const struct got_error *err;
602 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
607 if (packidx->sorted_offsets == NULL) {
608 err = build_offset_index(packidx);
613 if (offset >= 0x7fffffff) {
615 left = 0, right = packidx->nlargeobj - 1;
616 while (left <= right) {
617 i = ((left + right) / 2);
618 lo = packidx->sorted_large_offsets[i].offset;
620 *idx = packidx->sorted_large_offsets[i].idx;
622 } else if (offset > lo)
624 else if (offset < lo)
629 left = 0, right = totobj - packidx->nlargeobj - 1;
630 while (left <= right) {
631 i = ((left + right) / 2);
632 o = packidx->sorted_offsets[i].offset;
634 *idx = packidx->sorted_offsets[i].idx;
636 } else if (offset > o)
646 const struct got_error *
647 got_packidx_get_object_id(struct got_object_id *id,
648 struct got_packidx *packidx, int idx)
650 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
651 struct got_packidx_object_id *oid;
653 if (idx < 0 || idx >= totobj)
654 return got_error(GOT_ERR_NO_OBJ);
656 oid = &packidx->hdr.sorted_ids[idx];
657 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
661 const struct got_error *
662 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
663 struct got_packidx *packidx, const char *id_str_prefix)
665 const struct got_error *err = NULL;
667 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
669 size_t prefix_len = strlen(id_str_prefix);
670 struct got_packidx_object_id *oid;
673 STAILQ_INIT(matched_ids);
676 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
678 hex[0] = id_str_prefix[0];
679 hex[1] = id_str_prefix[1];
681 if (!got_parse_xdigit(&id0, hex))
682 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
685 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
686 oid = &packidx->hdr.sorted_ids[i];
687 while (i < totobj && oid->sha1[0] == id0) {
688 char id_str[SHA1_DIGEST_STRING_LENGTH];
689 struct got_object_qid *qid;
692 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
693 return got_error(GOT_ERR_NO_SPACE);
695 cmp = strncmp(id_str, id_str_prefix, prefix_len);
697 oid = &packidx->hdr.sorted_ids[++i];
702 err = got_object_qid_alloc_partial(&qid);
705 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
706 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
708 oid = &packidx->hdr.sorted_ids[++i];
712 got_object_id_queue_free(matched_ids);
717 set_max_datasize(void)
721 if (getrlimit(RLIMIT_DATA, &rl) != 0)
724 rl.rlim_cur = rl.rlim_max;
725 setrlimit(RLIMIT_DATA, &rl);
728 const struct got_error *
729 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
731 const struct got_error *err = NULL;
734 struct imsgbuf *ibuf;
736 ibuf = calloc(1, sizeof(*ibuf));
738 return got_error_from_errno("calloc");
740 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
741 if (pack->privsep_child == NULL) {
742 err = got_error_from_errno("calloc");
746 pack->child_has_tempfiles = 0;
747 pack->child_has_delta_outfd = 0;
749 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
750 err = got_error_from_errno("socketpair");
756 err = got_error_from_errno("fork");
758 } else if (pid == 0) {
760 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
761 pack->path_packfile);
765 if (close(imsg_fds[1]) == -1)
766 return got_error_from_errno("close");
767 pack->privsep_child->imsg_fd = imsg_fds[0];
768 pack->privsep_child->pid = pid;
769 imsg_init(ibuf, imsg_fds[0]);
770 pack->privsep_child->ibuf = ibuf;
772 err = got_privsep_init_pack_child(ibuf, pack, packidx);
774 const struct got_error *child_err;
775 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
776 child_err = got_privsep_wait_for_child(
777 pack->privsep_child->pid);
778 if (child_err && err == NULL)
784 free(pack->privsep_child);
785 pack->privsep_child = NULL;
790 static const struct got_error *
791 pack_stop_privsep_child(struct got_pack *pack)
793 const struct got_error *err = NULL, *close_err = NULL;
795 if (pack->privsep_child == NULL)
798 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
801 if (close(pack->privsep_child->imsg_fd) == -1)
802 close_err = got_error_from_errno("close");
803 err = got_privsep_wait_for_child(pack->privsep_child->pid);
804 if (close_err && err == NULL)
806 imsg_clear(pack->privsep_child->ibuf);
807 free(pack->privsep_child->ibuf);
808 free(pack->privsep_child);
809 pack->privsep_child = NULL;
813 const struct got_error *
814 got_pack_close(struct got_pack *pack)
816 const struct got_error *err = NULL;
818 err = pack_stop_privsep_child(pack);
819 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
820 err = got_error_from_errno("munmap");
821 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
822 err = got_error_from_errno("close");
824 free(pack->path_packfile);
825 pack->path_packfile = NULL;
827 if (pack->delta_cache) {
828 got_delta_cache_free(pack->delta_cache);
829 pack->delta_cache = NULL;
833 * Leave accumfd and basefd alone. They are managed by the
834 * repository layer and can be reused.
840 const struct got_error *
841 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
842 struct got_pack *pack, off_t offset)
852 if (offset >= pack->filesize)
853 return got_error(GOT_ERR_PACK_OFFSET);
856 if (offset > SIZE_MAX) {
857 return got_error_fmt(GOT_ERR_PACK_OFFSET,
858 "offset %lld overflows size_t",
862 mapoff = (size_t)offset;
864 if (lseek(pack->fd, offset, SEEK_SET) == -1)
865 return got_error_from_errno("lseek");
869 /* We do not support size values which don't fit in 64 bit. */
871 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
872 "packfile offset %lld", (long long)offset);
875 if (mapoff + sizeof(sizeN) >= pack->filesize)
876 return got_error(GOT_ERR_BAD_PACKFILE);
877 sizeN = *(pack->map + mapoff);
878 mapoff += sizeof(sizeN);
880 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
882 return got_error_from_errno("read");
883 if (n != sizeof(sizeN))
884 return got_error(GOT_ERR_BAD_PACKFILE);
886 *len += sizeof(sizeN);
889 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
890 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
891 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
893 size_t shift = 4 + 7 * (i - 1);
894 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
897 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
904 static const struct got_error *
905 open_plain_object(struct got_object **obj, struct got_object_id *id,
906 uint8_t type, off_t offset, size_t size, int idx)
908 *obj = calloc(1, sizeof(**obj));
910 return got_error_from_errno("calloc");
913 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
914 (*obj)->pack_idx = idx;
917 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
918 (*obj)->pack_offset = offset;
923 static const struct got_error *
924 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
935 /* We do not support offset values which don't fit in 64 bit. */
937 return got_error(GOT_ERR_NO_SPACE);
942 if (delta_offset + *len > SIZE_MAX) {
943 return got_error_fmt(GOT_ERR_PACK_OFFSET,
944 "mapoff %lld would overflow size_t",
945 (long long)delta_offset + *len);
948 mapoff = (size_t)delta_offset + *len;
949 if (mapoff + sizeof(offN) >= pack->filesize)
950 return got_error(GOT_ERR_PACK_OFFSET);
951 offN = *(pack->map + mapoff);
954 n = read(pack->fd, &offN, sizeof(offN));
956 return got_error_from_errno("read");
957 if (n != sizeof(offN))
958 return got_error(GOT_ERR_BAD_PACKFILE);
960 *len += sizeof(offN);
963 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
967 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
970 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
976 const struct got_error *
977 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
978 struct got_pack *pack, off_t offset, size_t tslen)
980 const struct got_error *err;
986 err = parse_negative_offset(&negoffset, &negofflen, pack,
991 /* Compute the base object's offset (must be in the same pack file). */
992 *base_offset = (offset - negoffset);
993 if (*base_offset <= 0)
994 return got_error(GOT_ERR_BAD_PACKFILE);
1000 static const struct got_error *
1001 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1002 size_t *delta_compressed_len, size_t delta_data_offset,
1003 struct got_pack *pack)
1005 const struct got_error *err = NULL;
1006 size_t consumed = 0;
1009 if (delta_data_offset >= pack->filesize)
1010 return got_error(GOT_ERR_PACK_OFFSET);
1011 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1012 &consumed, NULL, pack->map, delta_data_offset,
1013 pack->filesize - delta_data_offset);
1017 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1018 return got_error_from_errno("lseek");
1019 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1020 &consumed, NULL, 0, pack->fd);
1025 if (delta_compressed_len)
1026 *delta_compressed_len = consumed;
1031 static const struct got_error *
1032 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1033 int delta_type, size_t delta_size, off_t delta_data_offset)
1035 struct got_delta *delta;
1037 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1040 return got_error_from_errno("got_delta_open");
1041 /* delta is freed in got_object_close() */
1043 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1047 static const struct got_error *
1048 resolve_offset_delta(struct got_delta_chain *deltas,
1049 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1050 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1052 const struct got_error *err;
1057 off_t delta_data_offset;
1060 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1061 delta_offset, tslen);
1065 delta_data_offset = delta_offset + tslen + consumed;
1066 if (delta_data_offset >= pack->filesize)
1067 return got_error(GOT_ERR_PACK_OFFSET);
1069 if (pack->map == NULL) {
1070 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1071 if (delta_data_offset == -1)
1072 return got_error_from_errno("lseek");
1075 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1080 /* An offset delta must be in the same packfile. */
1081 if (base_offset >= pack->filesize)
1082 return got_error(GOT_ERR_PACK_OFFSET);
1084 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1085 &base_tslen, pack, base_offset);
1089 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1090 base_tslen, base_type, base_size, recursion - 1);
1093 const struct got_error *
1094 got_pack_parse_ref_delta(struct got_object_id *id,
1095 struct got_pack *pack, off_t delta_offset, int tslen)
1100 if (delta_offset + tslen > SIZE_MAX) {
1101 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1102 "mapoff %lld would overflow size_t",
1103 (long long)delta_offset + tslen);
1106 mapoff = delta_offset + tslen;
1107 if (mapoff + sizeof(*id) >= pack->filesize)
1108 return got_error(GOT_ERR_PACK_OFFSET);
1109 memcpy(id, pack->map + mapoff, sizeof(*id));
1112 n = read(pack->fd, id, sizeof(*id));
1114 return got_error_from_errno("read");
1115 if (n != sizeof(*id))
1116 return got_error(GOT_ERR_BAD_PACKFILE);
1122 static const struct got_error *
1123 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1124 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1125 size_t delta_size, unsigned int recursion)
1127 const struct got_error *err;
1128 struct got_object_id id;
1134 off_t delta_data_offset;
1136 if (delta_offset + tslen >= pack->filesize)
1137 return got_error(GOT_ERR_PACK_OFFSET);
1139 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1143 delta_data_offset = delta_offset + tslen + sizeof(id);
1145 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1146 if (delta_data_offset == -1)
1147 return got_error_from_errno("lseek");
1150 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1155 /* Delta base must be in the same pack file. */
1156 idx = got_packidx_get_object_idx(packidx, &id);
1158 return got_error(GOT_ERR_NO_OBJ);
1160 base_offset = got_packidx_get_object_offset(packidx, idx);
1161 if (base_offset == -1)
1162 return got_error(GOT_ERR_BAD_PACKIDX);
1164 if (base_offset >= pack->filesize)
1165 return got_error(GOT_ERR_PACK_OFFSET);
1167 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1168 &base_tslen, pack, base_offset);
1172 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1173 base_tslen, base_type, base_size, recursion - 1);
1176 const struct got_error *
1177 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1178 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1179 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1181 const struct got_error *err = NULL;
1183 if (--recursion == 0)
1184 return got_error(GOT_ERR_RECURSION);
1186 switch (delta_type) {
1187 case GOT_OBJ_TYPE_COMMIT:
1188 case GOT_OBJ_TYPE_TREE:
1189 case GOT_OBJ_TYPE_BLOB:
1190 case GOT_OBJ_TYPE_TAG:
1191 /* Plain types are the final delta base. Recursion ends. */
1192 err = add_delta(deltas, delta_offset, tslen, delta_type,
1195 case GOT_OBJ_TYPE_OFFSET_DELTA:
1196 err = resolve_offset_delta(deltas, packidx, pack,
1197 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1199 case GOT_OBJ_TYPE_REF_DELTA:
1200 err = resolve_ref_delta(deltas, packidx, pack,
1201 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1204 return got_error(GOT_ERR_OBJ_TYPE);
1210 static const struct got_error *
1211 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1212 struct got_pack *pack, struct got_object_id *id, off_t offset,
1213 size_t tslen, int delta_type, size_t delta_size, int idx)
1215 const struct got_error *err = NULL;
1218 *obj = calloc(1, sizeof(**obj));
1220 return got_error_from_errno("calloc");
1224 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1225 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1226 (*obj)->pack_offset = offset + tslen;
1228 STAILQ_INIT(&(*obj)->deltas.entries);
1229 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1230 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1231 (*obj)->pack_idx = idx;
1233 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1234 offset, tslen, delta_type, delta_size,
1235 GOT_DELTA_CHAIN_RECURSION_MAX);
1239 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1242 (*obj)->type = resolved_type;
1245 got_object_close(*obj);
1251 const struct got_error *
1252 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1253 struct got_packidx *packidx, int idx, struct got_object_id *id)
1255 const struct got_error *err = NULL;
1263 offset = got_packidx_get_object_offset(packidx, idx);
1265 return got_error(GOT_ERR_BAD_PACKIDX);
1267 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1273 case GOT_OBJ_TYPE_COMMIT:
1274 case GOT_OBJ_TYPE_TREE:
1275 case GOT_OBJ_TYPE_BLOB:
1276 case GOT_OBJ_TYPE_TAG:
1277 err = open_plain_object(obj, id, type, offset + tslen,
1280 case GOT_OBJ_TYPE_OFFSET_DELTA:
1281 case GOT_OBJ_TYPE_REF_DELTA:
1282 err = open_delta_object(obj, packidx, pack, id, offset,
1283 tslen, type, size, idx);
1286 err = got_error(GOT_ERR_OBJ_TYPE);
1293 const struct got_error *
1294 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1295 struct got_delta_chain *deltas, struct got_pack *pack)
1297 struct got_delta *delta;
1298 uint64_t base_size = 0, result_size = 0;
1301 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1302 /* Plain object types are the delta base. */
1303 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1304 delta->type != GOT_OBJ_TYPE_TREE &&
1305 delta->type != GOT_OBJ_TYPE_BLOB &&
1306 delta->type != GOT_OBJ_TYPE_TAG) {
1307 const struct got_error *err;
1308 uint8_t *delta_buf = NULL;
1312 if (pack->delta_cache) {
1313 got_delta_cache_get(&delta_buf, &delta_len,
1314 pack->delta_cache, delta->data_offset);
1316 if (delta_buf == NULL) {
1318 err = read_delta_data(&delta_buf, &delta_len,
1319 NULL, delta->data_offset, pack);
1323 if (pack->delta_cache && !cached) {
1324 err = got_delta_cache_add(pack->delta_cache,
1325 delta->data_offset, delta_buf, delta_len);
1328 else if (err->code != GOT_ERR_NO_SPACE) {
1333 err = got_delta_get_sizes(&base_size, &result_size,
1334 delta_buf, delta_len);
1340 base_size = delta->size;
1341 if (base_size > *max_size)
1342 *max_size = base_size;
1343 if (result_size > *max_size)
1344 *max_size = result_size;
1350 const struct got_error *
1351 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1352 struct got_pack *pack)
1354 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1355 return got_error(GOT_ERR_OBJ_TYPE);
1357 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1360 const struct got_error *
1361 got_pack_dump_delta_chain_to_file(size_t *result_size,
1362 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1363 FILE *base_file, FILE *accum_file)
1365 const struct got_error *err = NULL;
1366 struct got_delta *delta;
1367 uint8_t *base_buf = NULL, *accum_buf = NULL;
1368 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1369 /* We process small enough files entirely in memory for speed. */
1370 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1371 uint64_t max_size = 0;
1376 if (STAILQ_EMPTY(&deltas->entries))
1377 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1379 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1380 return got_error_from_errno("fseeko");
1381 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1382 return got_error_from_errno("fseeko");
1384 /* Deltas are ordered in ascending order. */
1385 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1386 uint8_t *delta_buf = NULL;
1387 uint64_t base_size, result_size = 0;
1391 off_t delta_data_offset;
1393 /* Plain object types are the delta base. */
1394 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1395 delta->type != GOT_OBJ_TYPE_TREE &&
1396 delta->type != GOT_OBJ_TYPE_BLOB &&
1397 delta->type != GOT_OBJ_TYPE_TAG) {
1398 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1402 delta_data_offset = delta->offset + delta->tslen;
1403 if (delta_data_offset >= pack->filesize) {
1404 err = got_error(GOT_ERR_PACK_OFFSET);
1407 if (pack->map == NULL) {
1408 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1410 err = got_error_from_errno("lseek");
1414 if (delta->size > max_size)
1415 max_size = delta->size;
1416 if (max_size > max_bufsize) {
1418 if (delta_data_offset > SIZE_MAX) {
1419 return got_error_fmt(
1421 "delta offset %lld "
1427 mapoff = delta_data_offset;
1428 err = got_inflate_to_file_mmap(
1429 &base_bufsz, NULL, NULL, pack->map,
1430 mapoff, pack->filesize - mapoff,
1433 err = got_inflate_to_file_fd(
1434 &base_bufsz, NULL, NULL, pack->fd,
1437 accum_buf = malloc(max_size);
1438 if (accum_buf == NULL) {
1439 err = got_error_from_errno("malloc");
1442 accum_bufsz = max_size;
1444 if (delta_data_offset > SIZE_MAX) {
1445 return got_error_fmt(
1447 "delta offset %lld "
1453 mapoff = delta_data_offset;
1454 err = got_inflate_to_mem_mmap(&base_buf,
1455 &base_bufsz, NULL, NULL,
1457 pack->filesize - mapoff);
1459 err = got_inflate_to_mem_fd(&base_buf,
1460 &base_bufsz, NULL, NULL, max_size,
1466 if (base_buf == NULL)
1471 if (pack->delta_cache) {
1472 got_delta_cache_get(&delta_buf, &delta_len,
1473 pack->delta_cache, delta->data_offset);
1475 if (delta_buf == NULL) {
1477 err = read_delta_data(&delta_buf, &delta_len, NULL,
1478 delta->data_offset, pack);
1482 if (pack->delta_cache && !cached) {
1483 err = got_delta_cache_add(pack->delta_cache,
1484 delta->data_offset, delta_buf, delta_len);
1487 else if (err->code != GOT_ERR_NO_SPACE) {
1493 err = got_delta_get_sizes(&base_size, &result_size,
1494 delta_buf, delta_len);
1500 if (base_size > max_size)
1501 max_size = base_size;
1502 if (result_size > max_size)
1503 max_size = result_size;
1505 if (base_buf && max_size > max_bufsize) {
1506 /* Switch from buffers to temporary files. */
1507 size_t w = fwrite(base_buf, 1, base_bufsz,
1509 if (w != base_bufsz) {
1510 err = got_ferror(outfile, GOT_ERR_IO);
1521 if (base_buf && max_size > base_bufsz) {
1522 uint8_t *p = realloc(base_buf, max_size);
1524 err = got_error_from_errno("realloc");
1530 base_bufsz = max_size;
1533 if (accum_buf && max_size > accum_bufsz) {
1534 uint8_t *p = realloc(accum_buf, max_size);
1536 err = got_error_from_errno("realloc");
1542 accum_bufsz = max_size;
1546 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1547 delta_buf, delta_len, accum_buf,
1548 &accum_size, max_size);
1551 err = got_delta_apply(base_file, delta_buf,
1553 /* Final delta application writes to output file. */
1554 ++n < deltas->nentries ? accum_file : outfile,
1562 if (n < deltas->nentries) {
1563 /* Accumulated delta becomes the new base. */
1565 uint8_t *tmp = accum_buf;
1566 size_t tmp_size = accum_bufsz;
1567 accum_buf = base_buf;
1568 accum_bufsz = base_bufsz;
1570 base_bufsz = tmp_size;
1572 FILE *tmp = accum_file;
1573 accum_file = base_file;
1584 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1586 if (len != accum_size)
1587 err = got_ferror(outfile, GOT_ERR_IO);
1591 *result_size = accum_size;
1595 const struct got_error *
1596 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1597 struct got_delta_chain *deltas, struct got_pack *pack)
1599 const struct got_error *err = NULL;
1600 struct got_delta *delta;
1601 uint8_t *base_buf = NULL, *accum_buf = NULL;
1602 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1603 uint64_t max_size = 0;
1609 if (STAILQ_EMPTY(&deltas->entries))
1610 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1612 /* Deltas are ordered in ascending order. */
1613 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1614 uint8_t *delta_buf = NULL;
1615 uint64_t base_size, result_size = 0;
1618 off_t delta_data_offset;
1620 /* Plain object types are the delta base. */
1621 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1622 delta->type != GOT_OBJ_TYPE_TREE &&
1623 delta->type != GOT_OBJ_TYPE_BLOB &&
1624 delta->type != GOT_OBJ_TYPE_TAG) {
1625 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1629 delta_data_offset = delta->offset + delta->tslen;
1630 if (delta_data_offset >= pack->filesize) {
1631 err = got_error(GOT_ERR_PACK_OFFSET);
1635 if (delta->size > max_size)
1636 max_size = delta->size;
1641 if (delta_data_offset > SIZE_MAX) {
1642 return got_error_fmt(GOT_ERR_RANGE,
1643 "delta %lld offset would "
1645 (long long)delta_data_offset);
1648 mapoff = delta_data_offset;
1649 err = got_inflate_to_mem_mmap(&base_buf,
1650 &base_bufsz, NULL, NULL, pack->map,
1651 mapoff, pack->filesize - mapoff);
1653 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1655 err = got_error_from_errno("lseek");
1658 err = got_inflate_to_mem_fd(&base_buf,
1659 &base_bufsz, NULL, NULL, max_size,
1668 if (pack->delta_cache) {
1669 got_delta_cache_get(&delta_buf, &delta_len,
1670 pack->delta_cache, delta->data_offset);
1672 if (delta_buf == NULL) {
1674 err = read_delta_data(&delta_buf, &delta_len, NULL,
1675 delta->data_offset, pack);
1679 if (pack->delta_cache && !cached) {
1680 err = got_delta_cache_add(pack->delta_cache,
1681 delta->data_offset, delta_buf, delta_len);
1684 else if (err->code != GOT_ERR_NO_SPACE) {
1690 err = got_delta_get_sizes(&base_size, &result_size,
1691 delta_buf, delta_len);
1697 if (base_size > max_size)
1698 max_size = base_size;
1699 if (result_size > max_size)
1700 max_size = result_size;
1702 if (max_size > base_bufsz) {
1703 uint8_t *p = realloc(base_buf, max_size);
1705 err = got_error_from_errno("realloc");
1711 base_bufsz = max_size;
1714 if (max_size > accum_bufsz) {
1715 uint8_t *p = realloc(accum_buf, max_size);
1717 err = got_error_from_errno("realloc");
1723 accum_bufsz = max_size;
1726 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1727 delta_buf, delta_len, accum_buf,
1728 &accum_size, max_size);
1735 if (n < deltas->nentries) {
1736 /* Accumulated delta becomes the new base. */
1737 uint8_t *tmp = accum_buf;
1738 size_t tmp_size = accum_bufsz;
1739 accum_buf = base_buf;
1740 accum_bufsz = base_bufsz;
1742 base_bufsz = tmp_size;
1753 *outbuf = accum_buf;
1754 *outlen = accum_size;
1759 const struct got_error *
1760 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1761 FILE *outfile, FILE *base_file, FILE *accum_file)
1763 const struct got_error *err = NULL;
1765 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1766 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1768 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1769 if (obj->pack_offset >= pack->filesize)
1770 return got_error(GOT_ERR_PACK_OFFSET);
1775 if (obj->pack_offset > SIZE_MAX) {
1776 return got_error_fmt(GOT_ERR_RANGE,
1777 "pack offset %lld would overflow size_t",
1778 (long long)obj->pack_offset);
1781 mapoff = obj->pack_offset;
1782 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1783 pack->map, mapoff, pack->filesize - mapoff,
1786 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1787 return got_error_from_errno("lseek");
1788 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1792 err = got_pack_dump_delta_chain_to_file(&obj->size,
1793 &obj->deltas, pack, outfile, base_file, accum_file);
1798 const struct got_error *
1799 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1800 struct got_object *obj, struct got_pack *pack)
1802 const struct got_error *err = NULL;
1804 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1805 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1807 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1808 if (obj->pack_offset >= pack->filesize)
1809 return got_error(GOT_ERR_PACK_OFFSET);
1813 if (obj->pack_offset > SIZE_MAX) {
1814 return got_error_fmt(GOT_ERR_RANGE,
1815 "pack offset %lld would overflow size_t",
1816 (long long)obj->pack_offset);
1819 mapoff = obj->pack_offset;
1820 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1821 pack->map, mapoff, pack->filesize - mapoff);
1823 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1824 return got_error_from_errno("lseek");
1825 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1826 obj->size, pack->fd);
1829 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1835 static const struct got_error *
1836 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1837 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1838 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1840 const struct got_error *err = NULL;
1842 /* Validate decompression and obtain the decompressed size. */
1843 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1844 delta_data_offset, pack);
1848 /* Read delta base/result sizes from head of delta stream. */
1849 err = got_delta_get_sizes(base_size, result_size,
1850 *delta_buf, *delta_len);
1854 /* Discard decompressed delta and read it again in compressed form. */
1856 *delta_buf = malloc(*delta_len_compressed);
1857 if (*delta_buf == NULL) {
1858 err = got_error_from_errno("malloc");
1862 if (delta_data_offset >= pack->filesize) {
1863 err = got_error(GOT_ERR_PACK_OFFSET);
1866 memcpy(*delta_buf, pack->map + delta_data_offset,
1867 *delta_len_compressed);
1870 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1871 err = got_error_from_errno("lseek");
1874 n = read(pack->fd, *delta_buf, *delta_len_compressed);
1876 err = got_error_from_errno("read");
1878 } else if (n != *delta_len_compressed) {
1879 err = got_error(GOT_ERR_IO);
1888 *delta_len_compressed = 0;
1895 const struct got_error *
1896 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1897 size_t *delta_compressed_size, off_t *delta_offset,
1898 off_t *delta_data_offset, off_t *base_offset,
1899 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1900 struct got_pack *pack, struct got_packidx *packidx, int idx)
1902 const struct got_error *err = NULL;
1906 size_t tslen, delta_hdrlen;
1910 *delta_compressed_size = 0;
1912 *delta_data_offset = 0;
1917 offset = got_packidx_get_object_offset(packidx, idx);
1919 return got_error(GOT_ERR_BAD_PACKIDX);
1921 if (offset >= pack->filesize)
1922 return got_error(GOT_ERR_PACK_OFFSET);
1924 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1929 if (tslen + size < tslen || offset + size < size ||
1930 tslen + offset < tslen)
1931 return got_error(GOT_ERR_PACK_OFFSET);
1934 case GOT_OBJ_TYPE_OFFSET_DELTA:
1935 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1936 pack, offset, tslen);
1940 case GOT_OBJ_TYPE_REF_DELTA:
1941 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1944 delta_hdrlen = SHA1_DIGEST_LENGTH;
1947 return got_error_fmt(GOT_ERR_OBJ_TYPE,
1948 "non-delta object type %d found at offset %lld",
1949 type, (long long)offset);
1952 if (tslen + delta_hdrlen < delta_hdrlen ||
1953 offset + delta_hdrlen < delta_hdrlen)
1954 return got_error(GOT_ERR_BAD_DELTA);
1956 *delta_data_offset = offset + tslen + delta_hdrlen;
1957 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1958 base_size, result_size, *delta_data_offset, pack, packidx);
1962 if (*delta_size != size) {
1963 err = got_error(GOT_ERR_BAD_DELTA);
1967 *delta_offset = offset;
1973 *delta_compressed_size = 0;