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.
16 #include "got_compat.h"
18 #include <sys/types.h>
20 #include <sys/queue.h>
23 #include <sys/resource.h>
24 #include <sys/socket.h>
36 #include "got_error.h"
37 #include "got_object.h"
40 #include "got_lib_hash.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_delta_cache.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_qid.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
51 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
58 static const struct got_error *
59 verify_fanout_table(uint32_t *fanout_table)
63 for (i = 0; i < 0xff - 1; i++) {
64 if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
65 return got_error(GOT_ERR_BAD_PACKIDX);
71 const struct got_error *
72 got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
74 const struct got_error *err = NULL;
75 enum got_hash_algorithm algo = GOT_HASH_SHA1;
76 struct got_packidx_v2_hdr *h;
78 uint8_t hash[GOT_HASH_DIGEST_MAXLEN];
79 size_t nobj, len_fanout, len_ids, offset, remain;
83 got_hash_init(&ctx, algo);
89 if (remain < sizeof(*h->magic)) {
90 err = got_error(GOT_ERR_BAD_PACKIDX);
94 h->magic = (uint32_t *)(p->map + offset);
96 h->magic = malloc(sizeof(*h->magic));
97 if (h->magic == NULL) {
98 err = got_error_from_errno("malloc");
101 n = read(p->fd, h->magic, sizeof(*h->magic));
103 err = got_error_from_errno("read");
105 } else if (n != sizeof(*h->magic)) {
106 err = got_error(GOT_ERR_BAD_PACKIDX);
110 if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
111 err = got_error(GOT_ERR_BAD_PACKIDX);
114 offset += sizeof(*h->magic);
115 remain -= sizeof(*h->magic);
118 got_hash_update(&ctx, h->magic, sizeof(*h->magic));
120 if (remain < sizeof(*h->version)) {
121 err = got_error(GOT_ERR_BAD_PACKIDX);
125 h->version = (uint32_t *)(p->map + offset);
127 h->version = malloc(sizeof(*h->version));
128 if (h->version == NULL) {
129 err = got_error_from_errno("malloc");
132 n = read(p->fd, h->version, sizeof(*h->version));
134 err = got_error_from_errno("read");
136 } else if (n != sizeof(*h->version)) {
137 err = got_error(GOT_ERR_BAD_PACKIDX);
141 if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
142 err = got_error(GOT_ERR_BAD_PACKIDX);
145 offset += sizeof(*h->version);
146 remain -= sizeof(*h->version);
149 got_hash_update(&ctx, h->version, sizeof(*h->version));
152 sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
153 if (remain < len_fanout) {
154 err = got_error(GOT_ERR_BAD_PACKIDX);
158 h->fanout_table = (uint32_t *)(p->map + offset);
160 h->fanout_table = malloc(len_fanout);
161 if (h->fanout_table == NULL) {
162 err = got_error_from_errno("malloc");
165 n = read(p->fd, h->fanout_table, len_fanout);
167 err = got_error_from_errno("read");
169 } else if (n != len_fanout) {
170 err = got_error(GOT_ERR_BAD_PACKIDX);
174 err = verify_fanout_table(h->fanout_table);
178 got_hash_update(&ctx, h->fanout_table, len_fanout);
179 offset += len_fanout;
180 remain -= len_fanout;
182 nobj = be32toh(h->fanout_table[0xff]);
183 len_ids = nobj * sizeof(*h->sorted_ids);
184 if (len_ids <= nobj || len_ids > remain) {
185 err = got_error(GOT_ERR_BAD_PACKIDX);
190 (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
192 h->sorted_ids = malloc(len_ids);
193 if (h->sorted_ids == NULL) {
194 err = got_error(GOT_ERR_BAD_PACKIDX);
197 n = read(p->fd, h->sorted_ids, len_ids);
199 err = got_error_from_errno("read");
200 else if (n != len_ids) {
201 err = got_error(GOT_ERR_BAD_PACKIDX);
206 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 < sizeof(*h->trailer)) {
305 err = got_error(GOT_ERR_BAD_PACKIDX);
310 (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
312 h->trailer = malloc(sizeof(*h->trailer));
313 if (h->trailer == NULL) {
314 err = got_error_from_errno("malloc");
317 n = read(p->fd, h->trailer, sizeof(*h->trailer));
319 err = got_error_from_errno("read");
320 else if (n != sizeof(*h->trailer)) {
321 err = got_error(GOT_ERR_BAD_PACKIDX);
326 got_hash_update(&ctx, h->trailer->packfile_sha1,
328 got_hash_final(&ctx, hash);
329 if (got_hash_cmp(ctx.algo, hash, h->trailer->packidx_sha1) != 0)
330 err = got_error(GOT_ERR_PACKIDX_CSUM);
336 const struct got_error *
337 got_packidx_open(struct got_packidx **packidx,
338 int dir_fd, const char *relpath, int verify)
340 const struct got_error *err = NULL;
341 struct got_packidx *p = NULL;
343 struct stat idx_sb, pack_sb;
347 err = got_packidx_get_packfile_path(&pack_relpath, relpath);
352 * Ensure that a corresponding pack file exists.
353 * Some Git repositories have this problem. Git seems to ignore
354 * the existence of lonely pack index files but we do not.
356 if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
357 if (errno == ENOENT) {
358 err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
361 err = got_error_from_errno2("fstatat", pack_relpath);
365 p = calloc(1, sizeof(*p));
367 err = got_error_from_errno("calloc");
371 p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
373 err = got_error_from_errno2("openat", relpath);
377 if (fstat(p->fd, &idx_sb) != 0) {
378 err = got_error_from_errno2("fstat", relpath);
381 p->len = idx_sb.st_size;
382 if (p->len < sizeof(p->hdr)) {
383 err = got_error(GOT_ERR_BAD_PACKIDX);
387 p->path_packidx = strdup(relpath);
388 if (p->path_packidx == NULL) {
389 err = got_error_from_errno("strdup");
393 #ifndef GOT_PACK_NO_MMAP
394 if (p->len > 0 && p->len <= SIZE_MAX) {
395 p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
396 if (p->map == MAP_FAILED) {
397 if (errno != ENOMEM) {
398 err = got_error_from_errno("mmap");
401 p->map = NULL; /* fall back to read(2) */
406 err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
410 got_packidx_close(p);
417 const struct got_error *
418 got_packidx_close(struct got_packidx *packidx)
420 const struct got_error *err = NULL;
422 free(packidx->path_packidx);
424 if (munmap(packidx->map, packidx->len) == -1)
425 err = got_error_from_errno("munmap");
427 free(packidx->hdr.magic);
428 free(packidx->hdr.version);
429 free(packidx->hdr.fanout_table);
430 free(packidx->hdr.sorted_ids);
431 free(packidx->hdr.crc32);
432 free(packidx->hdr.offsets);
433 free(packidx->hdr.large_offsets);
434 free(packidx->hdr.trailer);
436 if (close(packidx->fd) == -1 && err == NULL)
437 err = got_error_from_errno("close");
438 free(packidx->sorted_offsets);
439 free(packidx->sorted_large_offsets);
445 const struct got_error *
446 got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
450 /* Packfile path contains ".pack" instead of ".idx", so add one byte. */
451 size = strlen(path_packidx) + 2;
452 if (size < GOT_PACKFILE_NAMELEN + 1)
453 return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
455 *path_packfile = malloc(size);
456 if (*path_packfile == NULL)
457 return got_error_from_errno("malloc");
459 /* Copy up to and excluding ".idx". */
460 if (strlcpy(*path_packfile, path_packidx,
461 size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
462 return got_error(GOT_ERR_NO_SPACE);
464 if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
465 return got_error(GOT_ERR_NO_SPACE);
471 got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
473 uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
474 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
476 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
477 if (idx < 0 || idx >= packidx->nlargeobj ||
478 packidx->hdr.large_offsets == NULL)
480 loffset = be64toh(packidx->hdr.large_offsets[idx]);
481 return (loffset > INT64_MAX ? -1 : (off_t)loffset);
483 return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
487 got_packidx_get_object_idx(struct got_packidx *packidx,
488 struct got_object_id *id)
490 u_int8_t id0 = id->sha1[0];
491 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
492 int left = 0, right = totobj - 1;
495 left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
497 while (left <= right) {
498 struct got_packidx_object_id *oid;
501 i = ((left + right) / 2);
502 oid = &packidx->hdr.sorted_ids[i];
503 cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
516 offset_cmp(const void *pa, const void *pb)
518 const struct got_pack_offset_index *a, *b;
520 a = (const struct got_pack_offset_index *)pa;
521 b = (const struct got_pack_offset_index *)pb;
523 if (a->offset < b->offset)
525 else if (a->offset > b->offset)
532 large_offset_cmp(const void *pa, const void *pb)
534 const struct got_pack_large_offset_index *a, *b;
536 a = (const struct got_pack_large_offset_index *)pa;
537 b = (const struct got_pack_large_offset_index *)pb;
539 if (a->offset < b->offset)
541 else if (a->offset > b->offset)
547 static const struct got_error *
548 build_offset_index(struct got_packidx *p)
550 uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
551 unsigned int i, j, k;
553 p->sorted_offsets = calloc(nobj - p->nlargeobj,
554 sizeof(p->sorted_offsets[0]));
555 if (p->sorted_offsets == NULL)
556 return got_error_from_errno("calloc");
558 if (p->nlargeobj > 0) {
559 p->sorted_large_offsets = calloc(p->nlargeobj,
560 sizeof(p->sorted_large_offsets[0]));
561 if (p->sorted_large_offsets == NULL)
562 return got_error_from_errno("calloc");
567 for (i = 0; i < nobj; i++) {
568 uint32_t offset = be32toh(p->hdr.offsets[i]);
569 if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
572 idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
573 if (idx >= p->nlargeobj ||
575 p->hdr.large_offsets == NULL)
576 return got_error(GOT_ERR_BAD_PACKIDX);
577 loffset = be64toh(p->hdr.large_offsets[idx]);
578 p->sorted_large_offsets[j].offset = loffset;
579 p->sorted_large_offsets[j].idx = i;
582 p->sorted_offsets[k].offset = offset;
583 p->sorted_offsets[k].idx = i;
587 if (j != p->nlargeobj || k != nobj - p->nlargeobj)
588 return got_error(GOT_ERR_BAD_PACKIDX);
590 qsort(p->sorted_offsets, nobj - p->nlargeobj,
591 sizeof(p->sorted_offsets[0]), offset_cmp);
593 if (p->sorted_large_offsets)
594 qsort(p->sorted_large_offsets, p->nlargeobj,
595 sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
600 const struct got_error *
601 got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
603 const struct got_error *err;
604 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
609 if (packidx->sorted_offsets == NULL) {
610 err = build_offset_index(packidx);
615 if (offset >= 0x7fffffff) {
617 left = 0, right = packidx->nlargeobj - 1;
618 while (left <= right) {
619 i = ((left + right) / 2);
620 lo = packidx->sorted_large_offsets[i].offset;
622 *idx = packidx->sorted_large_offsets[i].idx;
624 } else if (offset > lo)
626 else if (offset < lo)
631 left = 0, right = totobj - packidx->nlargeobj - 1;
632 while (left <= right) {
633 i = ((left + right) / 2);
634 o = packidx->sorted_offsets[i].offset;
636 *idx = packidx->sorted_offsets[i].idx;
638 } else if (offset > o)
648 const struct got_error *
649 got_packidx_get_object_id(struct got_object_id *id,
650 struct got_packidx *packidx, int idx)
652 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
653 struct got_packidx_object_id *oid;
655 if (idx < 0 || idx >= totobj)
656 return got_error(GOT_ERR_NO_OBJ);
658 oid = &packidx->hdr.sorted_ids[idx];
659 memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
663 const struct got_error *
664 got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
665 struct got_packidx *packidx, const char *id_str_prefix)
667 const struct got_error *err = NULL;
669 uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
671 size_t prefix_len = strlen(id_str_prefix);
672 struct got_packidx_object_id *oid;
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];
715 set_max_datasize(void)
719 if (getrlimit(RLIMIT_DATA, &rl) != 0)
722 rl.rlim_cur = rl.rlim_max;
723 setrlimit(RLIMIT_DATA, &rl);
726 const struct got_error *
727 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
729 const struct got_error *err = NULL;
732 struct imsgbuf *ibuf;
734 ibuf = calloc(1, sizeof(*ibuf));
736 return got_error_from_errno("calloc");
738 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
739 if (pack->privsep_child == NULL) {
740 err = got_error_from_errno("calloc");
744 pack->child_has_tempfiles = 0;
745 pack->child_has_delta_outfd = 0;
747 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
748 err = got_error_from_errno("socketpair");
754 err = got_error_from_errno("fork");
756 } else if (pid == 0) {
758 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
759 pack->path_packfile);
763 if (close(imsg_fds[1]) == -1)
764 return got_error_from_errno("close");
765 pack->privsep_child->imsg_fd = imsg_fds[0];
766 pack->privsep_child->pid = pid;
767 imsg_init(ibuf, imsg_fds[0]);
768 pack->privsep_child->ibuf = ibuf;
770 err = got_privsep_init_pack_child(ibuf, pack, packidx);
772 const struct got_error *child_err;
773 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
774 child_err = got_privsep_wait_for_child(
775 pack->privsep_child->pid);
776 if (child_err && err == NULL)
782 free(pack->privsep_child);
783 pack->privsep_child = NULL;
788 static const struct got_error *
789 pack_stop_privsep_child(struct got_pack *pack)
791 const struct got_error *err = NULL, *close_err = NULL;
793 if (pack->privsep_child == NULL)
796 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
799 if (close(pack->privsep_child->imsg_fd) == -1)
800 close_err = got_error_from_errno("close");
801 err = got_privsep_wait_for_child(pack->privsep_child->pid);
802 if (close_err && err == NULL)
804 imsg_clear(pack->privsep_child->ibuf);
805 free(pack->privsep_child->ibuf);
806 free(pack->privsep_child);
807 pack->privsep_child = NULL;
811 const struct got_error *
812 got_pack_close(struct got_pack *pack)
814 const struct got_error *err = NULL;
816 err = pack_stop_privsep_child(pack);
817 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
818 err = got_error_from_errno("munmap");
819 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
820 err = got_error_from_errno("close");
822 free(pack->path_packfile);
823 pack->path_packfile = NULL;
825 if (pack->delta_cache) {
826 got_delta_cache_free(pack->delta_cache);
827 pack->delta_cache = NULL;
831 * Leave accumfd and basefd alone. They are managed by the
832 * repository layer and can be reused.
838 const struct got_error *
839 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
840 struct got_pack *pack, off_t offset)
850 if (offset >= pack->filesize)
851 return got_error(GOT_ERR_PACK_OFFSET);
854 if (offset > SIZE_MAX) {
855 return got_error_fmt(GOT_ERR_PACK_OFFSET,
856 "offset %lld overflows size_t",
860 mapoff = (size_t)offset;
862 if (lseek(pack->fd, offset, SEEK_SET) == -1)
863 return got_error_from_errno("lseek");
867 /* We do not support size values which don't fit in 64 bit. */
869 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
870 "packfile offset %lld", (long long)offset);
873 if (mapoff + sizeof(sizeN) >= pack->filesize)
874 return got_error(GOT_ERR_BAD_PACKFILE);
875 sizeN = *(pack->map + mapoff);
876 mapoff += sizeof(sizeN);
878 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
880 return got_error_from_errno("read");
881 if (n != sizeof(sizeN))
882 return got_error(GOT_ERR_BAD_PACKFILE);
884 *len += sizeof(sizeN);
887 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
888 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
889 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
891 size_t shift = 4 + 7 * (i - 1);
892 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
895 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
902 static const struct got_error *
903 open_plain_object(struct got_object **obj, struct got_object_id *id,
904 uint8_t type, off_t offset, size_t size, int idx)
906 *obj = calloc(1, sizeof(**obj));
908 return got_error_from_errno("calloc");
911 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
912 (*obj)->pack_idx = idx;
915 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
916 (*obj)->pack_offset = offset;
921 static const struct got_error *
922 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
933 /* We do not support offset values which don't fit in 64 bit. */
935 return got_error(GOT_ERR_NO_SPACE);
940 if (delta_offset + *len > SIZE_MAX) {
941 return got_error_fmt(GOT_ERR_PACK_OFFSET,
942 "mapoff %lld would overflow size_t",
943 (long long)delta_offset + *len);
946 mapoff = (size_t)delta_offset + *len;
947 if (mapoff + sizeof(offN) >= pack->filesize)
948 return got_error(GOT_ERR_PACK_OFFSET);
949 offN = *(pack->map + mapoff);
952 n = read(pack->fd, &offN, sizeof(offN));
954 return got_error_from_errno("read");
955 if (n != sizeof(offN))
956 return got_error(GOT_ERR_BAD_PACKFILE);
958 *len += sizeof(offN);
961 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
965 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
968 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
974 const struct got_error *
975 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
976 struct got_pack *pack, off_t offset, size_t tslen)
978 const struct got_error *err;
984 err = parse_negative_offset(&negoffset, &negofflen, pack,
989 /* Compute the base object's offset (must be in the same pack file). */
990 *base_offset = (offset - negoffset);
991 if (*base_offset <= 0)
992 return got_error(GOT_ERR_BAD_PACKFILE);
998 static const struct got_error *
999 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1000 size_t *delta_compressed_len, size_t delta_data_offset,
1001 struct got_pack *pack)
1003 const struct got_error *err = NULL;
1004 size_t consumed = 0;
1007 if (delta_data_offset >= pack->filesize)
1008 return got_error(GOT_ERR_PACK_OFFSET);
1009 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1010 &consumed, NULL, pack->map, delta_data_offset,
1011 pack->filesize - delta_data_offset);
1015 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1016 return got_error_from_errno("lseek");
1017 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1018 &consumed, NULL, 0, pack->fd);
1023 if (delta_compressed_len)
1024 *delta_compressed_len = consumed;
1029 static const struct got_error *
1030 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1031 int delta_type, size_t delta_size, off_t delta_data_offset)
1033 struct got_delta *delta;
1035 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1038 return got_error_from_errno("got_delta_open");
1039 /* delta is freed in got_object_close() */
1041 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1045 static const struct got_error *
1046 resolve_offset_delta(struct got_delta_chain *deltas,
1047 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1048 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1050 const struct got_error *err;
1055 off_t delta_data_offset;
1058 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1059 delta_offset, tslen);
1063 delta_data_offset = delta_offset + tslen + consumed;
1064 if (delta_data_offset >= pack->filesize)
1065 return got_error(GOT_ERR_PACK_OFFSET);
1067 if (pack->map == NULL) {
1068 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1069 if (delta_data_offset == -1)
1070 return got_error_from_errno("lseek");
1073 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1078 /* An offset delta must be in the same packfile. */
1079 if (base_offset >= pack->filesize)
1080 return got_error(GOT_ERR_PACK_OFFSET);
1082 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1083 &base_tslen, pack, base_offset);
1087 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1088 base_tslen, base_type, base_size, recursion - 1);
1091 const struct got_error *
1092 got_pack_parse_ref_delta(struct got_object_id *id,
1093 struct got_pack *pack, off_t delta_offset, int tslen)
1098 if (delta_offset + tslen > SIZE_MAX) {
1099 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1100 "mapoff %lld would overflow size_t",
1101 (long long)delta_offset + tslen);
1104 mapoff = delta_offset + tslen;
1105 if (mapoff + sizeof(*id) >= pack->filesize)
1106 return got_error(GOT_ERR_PACK_OFFSET);
1107 memcpy(id, pack->map + mapoff, sizeof(*id));
1110 n = read(pack->fd, id, sizeof(*id));
1112 return got_error_from_errno("read");
1113 if (n != sizeof(*id))
1114 return got_error(GOT_ERR_BAD_PACKFILE);
1120 static const struct got_error *
1121 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1122 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1123 size_t delta_size, unsigned int recursion)
1125 const struct got_error *err;
1126 struct got_object_id id;
1132 off_t delta_data_offset;
1134 if (delta_offset + tslen >= pack->filesize)
1135 return got_error(GOT_ERR_PACK_OFFSET);
1137 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1141 delta_data_offset = delta_offset + tslen + SHA1_DIGEST_LENGTH;
1143 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1144 if (delta_data_offset == -1)
1145 return got_error_from_errno("lseek");
1148 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1153 /* Delta base must be in the same pack file. */
1154 idx = got_packidx_get_object_idx(packidx, &id);
1156 return got_error(GOT_ERR_NO_OBJ);
1158 base_offset = got_packidx_get_object_offset(packidx, idx);
1159 if (base_offset == -1)
1160 return got_error(GOT_ERR_BAD_PACKIDX);
1162 if (base_offset >= pack->filesize)
1163 return got_error(GOT_ERR_PACK_OFFSET);
1165 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1166 &base_tslen, pack, base_offset);
1170 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1171 base_tslen, base_type, base_size, recursion - 1);
1174 const struct got_error *
1175 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1176 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1177 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1179 const struct got_error *err = NULL;
1181 if (--recursion == 0)
1182 return got_error(GOT_ERR_RECURSION);
1184 switch (delta_type) {
1185 case GOT_OBJ_TYPE_COMMIT:
1186 case GOT_OBJ_TYPE_TREE:
1187 case GOT_OBJ_TYPE_BLOB:
1188 case GOT_OBJ_TYPE_TAG:
1189 /* Plain types are the final delta base. Recursion ends. */
1190 err = add_delta(deltas, delta_offset, tslen, delta_type,
1193 case GOT_OBJ_TYPE_OFFSET_DELTA:
1194 err = resolve_offset_delta(deltas, packidx, pack,
1195 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1197 case GOT_OBJ_TYPE_REF_DELTA:
1198 err = resolve_ref_delta(deltas, packidx, pack,
1199 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1202 return got_error(GOT_ERR_OBJ_TYPE);
1208 static const struct got_error *
1209 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1210 struct got_pack *pack, struct got_object_id *id, off_t offset,
1211 size_t tslen, int delta_type, size_t delta_size, int idx)
1213 const struct got_error *err = NULL;
1216 *obj = calloc(1, sizeof(**obj));
1218 return got_error_from_errno("calloc");
1222 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1223 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1224 (*obj)->pack_offset = offset + tslen;
1226 STAILQ_INIT(&(*obj)->deltas.entries);
1227 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1228 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1229 (*obj)->pack_idx = idx;
1231 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1232 offset, tslen, delta_type, delta_size,
1233 GOT_DELTA_CHAIN_RECURSION_MAX);
1237 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1240 (*obj)->type = resolved_type;
1243 got_object_close(*obj);
1249 const struct got_error *
1250 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1251 struct got_packidx *packidx, int idx, struct got_object_id *id)
1253 const struct got_error *err = NULL;
1261 offset = got_packidx_get_object_offset(packidx, idx);
1263 return got_error(GOT_ERR_BAD_PACKIDX);
1265 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1271 case GOT_OBJ_TYPE_COMMIT:
1272 case GOT_OBJ_TYPE_TREE:
1273 case GOT_OBJ_TYPE_BLOB:
1274 case GOT_OBJ_TYPE_TAG:
1275 err = open_plain_object(obj, id, type, offset + tslen,
1278 case GOT_OBJ_TYPE_OFFSET_DELTA:
1279 case GOT_OBJ_TYPE_REF_DELTA:
1280 err = open_delta_object(obj, packidx, pack, id, offset,
1281 tslen, type, size, idx);
1284 err = got_error(GOT_ERR_OBJ_TYPE);
1291 const struct got_error *
1292 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1293 struct got_delta_chain *deltas, struct got_pack *pack)
1295 struct got_delta *delta;
1296 uint64_t base_size = 0, result_size = 0;
1299 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1300 /* Plain object types are the delta base. */
1301 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1302 delta->type != GOT_OBJ_TYPE_TREE &&
1303 delta->type != GOT_OBJ_TYPE_BLOB &&
1304 delta->type != GOT_OBJ_TYPE_TAG) {
1305 const struct got_error *err;
1306 uint8_t *delta_buf = NULL;
1310 if (pack->delta_cache) {
1311 got_delta_cache_get(&delta_buf, &delta_len,
1312 NULL, NULL, pack->delta_cache,
1313 delta->data_offset);
1315 if (delta_buf == NULL) {
1317 err = read_delta_data(&delta_buf, &delta_len,
1318 NULL, delta->data_offset, pack);
1322 if (pack->delta_cache && !cached) {
1323 err = got_delta_cache_add(pack->delta_cache,
1324 delta->data_offset, delta_buf, delta_len);
1327 else if (err->code != GOT_ERR_NO_SPACE) {
1332 err = got_delta_get_sizes(&base_size, &result_size,
1333 delta_buf, delta_len);
1339 base_size = delta->size;
1340 if (base_size > *max_size)
1341 *max_size = base_size;
1342 if (result_size > *max_size)
1343 *max_size = result_size;
1349 const struct got_error *
1350 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1351 struct got_pack *pack)
1353 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1354 return got_error(GOT_ERR_OBJ_TYPE);
1356 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1359 const struct got_error *
1360 got_pack_dump_delta_chain_to_file(size_t *result_size,
1361 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1362 FILE *base_file, FILE *accum_file)
1364 const struct got_error *err = NULL;
1365 struct got_delta *delta;
1366 uint8_t *base_buf = NULL, *accum_buf = NULL;
1367 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1368 /* We process small enough files entirely in memory for speed. */
1369 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1370 uint64_t max_size = 0;
1375 if (STAILQ_EMPTY(&deltas->entries))
1376 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1378 if (pack->delta_cache) {
1379 uint8_t *delta_buf = NULL, *fulltext = NULL;
1380 size_t delta_len, fulltext_len;
1382 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1383 got_delta_cache_get(&delta_buf, &delta_len,
1384 &fulltext, &fulltext_len,
1385 pack->delta_cache, delta->data_offset);
1389 w = fwrite(fulltext, 1, fulltext_len, outfile);
1390 if (w != fulltext_len)
1391 return got_ferror(outfile, GOT_ERR_IO);
1392 if (fflush(outfile) != 0)
1393 return got_error_from_errno("fflush");
1394 *result_size = fulltext_len;
1399 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1400 return got_error_from_errno("fseeko");
1401 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1402 return got_error_from_errno("fseeko");
1404 /* Deltas are ordered in ascending order. */
1405 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1406 uint8_t *delta_buf = NULL, *fulltext = NULL;
1407 size_t delta_len, fulltext_len;
1408 uint64_t base_size, result_size = 0;
1412 off_t delta_data_offset;
1414 /* Plain object types are the delta base. */
1415 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1416 delta->type != GOT_OBJ_TYPE_TREE &&
1417 delta->type != GOT_OBJ_TYPE_BLOB &&
1418 delta->type != GOT_OBJ_TYPE_TAG) {
1419 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1423 delta_data_offset = delta->offset + delta->tslen;
1424 if (delta_data_offset >= pack->filesize) {
1425 err = got_error(GOT_ERR_PACK_OFFSET);
1428 if (pack->map == NULL) {
1429 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1431 err = got_error_from_errno("lseek");
1435 if (delta->size > max_size)
1436 max_size = delta->size;
1437 if (max_size > max_bufsize) {
1439 if (delta_data_offset > SIZE_MAX) {
1440 return got_error_fmt(
1442 "delta offset %lld "
1448 mapoff = delta_data_offset;
1449 err = got_inflate_to_file_mmap(
1450 &base_bufsz, NULL, NULL, pack->map,
1451 mapoff, pack->filesize - mapoff,
1454 err = got_inflate_to_file_fd(
1455 &base_bufsz, NULL, NULL, pack->fd,
1458 accum_buf = malloc(max_size);
1459 if (accum_buf == NULL) {
1460 err = got_error_from_errno("malloc");
1463 accum_bufsz = max_size;
1465 if (delta_data_offset > SIZE_MAX) {
1466 return got_error_fmt(
1468 "delta offset %lld "
1474 mapoff = delta_data_offset;
1475 err = got_inflate_to_mem_mmap(&base_buf,
1476 &base_bufsz, NULL, NULL,
1478 pack->filesize - mapoff);
1480 err = got_inflate_to_mem_fd(&base_buf,
1481 &base_bufsz, NULL, NULL, max_size,
1487 if (base_buf == NULL)
1489 else if (pack->delta_cache && fulltext == NULL) {
1490 err = got_delta_cache_add(pack->delta_cache,
1491 delta_data_offset, NULL, 0);
1493 if (err->code != GOT_ERR_NO_SPACE)
1497 err = got_delta_cache_add_fulltext(
1500 base_buf, base_bufsz);
1502 err->code != GOT_ERR_NO_SPACE)
1510 if (pack->delta_cache) {
1511 got_delta_cache_get(&delta_buf, &delta_len,
1512 &fulltext, &fulltext_len,
1513 pack->delta_cache, delta->data_offset);
1515 if (delta_buf == NULL) {
1517 err = read_delta_data(&delta_buf, &delta_len, NULL,
1518 delta->data_offset, pack);
1522 if (pack->delta_cache && !cached) {
1523 err = got_delta_cache_add(pack->delta_cache,
1524 delta->data_offset, delta_buf, delta_len);
1527 else if (err->code != GOT_ERR_NO_SPACE) {
1533 err = got_delta_get_sizes(&base_size, &result_size,
1534 delta_buf, delta_len);
1540 if (base_size > max_size)
1541 max_size = base_size;
1542 if (result_size > max_size)
1543 max_size = result_size;
1544 if (fulltext_len > max_size)
1545 max_size = fulltext_len;
1547 if (base_buf && max_size > max_bufsize) {
1548 /* Switch from buffers to temporary files. */
1549 size_t w = fwrite(base_buf, 1, base_bufsz,
1551 if (w != base_bufsz) {
1552 err = got_ferror(outfile, GOT_ERR_IO);
1563 if (base_buf && max_size > base_bufsz) {
1564 uint8_t *p = realloc(base_buf, max_size);
1566 err = got_error_from_errno("realloc");
1572 base_bufsz = max_size;
1575 if (accum_buf && max_size > accum_bufsz) {
1576 uint8_t *p = realloc(accum_buf, max_size);
1578 err = got_error_from_errno("realloc");
1584 accum_bufsz = max_size;
1589 memcpy(accum_buf, fulltext, fulltext_len);
1590 accum_size = fulltext_len;
1593 err = got_delta_apply_in_mem(base_buf,
1594 base_bufsz, delta_buf, delta_len,
1595 accum_buf, &accum_size, max_size);
1602 if (fulltext == NULL) {
1603 err = got_delta_cache_add_fulltext(
1604 pack->delta_cache, delta->data_offset,
1605 accum_buf, accum_size);
1607 if (err->code != GOT_ERR_NO_SPACE)
1613 err = got_delta_apply(base_file, delta_buf,
1615 /* Final delta application writes to output file. */
1616 ++n < deltas->nentries ? accum_file : outfile,
1624 if (n < deltas->nentries) {
1625 /* Accumulated delta becomes the new base. */
1627 uint8_t *tmp = accum_buf;
1628 size_t tmp_size = accum_bufsz;
1629 accum_buf = base_buf;
1630 accum_bufsz = base_bufsz;
1632 base_bufsz = tmp_size;
1634 FILE *tmp = accum_file;
1635 accum_file = base_file;
1646 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1648 if (len != accum_size)
1649 err = got_ferror(outfile, GOT_ERR_IO);
1653 *result_size = accum_size;
1657 const struct got_error *
1658 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1659 struct got_delta_chain *deltas, struct got_pack *pack)
1661 const struct got_error *err = NULL;
1662 struct got_delta *delta;
1663 uint8_t *base_buf = NULL, *accum_buf = NULL;
1664 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1665 uint64_t max_size = 0;
1671 if (STAILQ_EMPTY(&deltas->entries))
1672 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1674 if (pack->delta_cache) {
1675 uint8_t *delta_buf = NULL, *fulltext = NULL;
1676 size_t delta_len, fulltext_len;
1678 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1679 got_delta_cache_get(&delta_buf, &delta_len,
1680 &fulltext, &fulltext_len,
1681 pack->delta_cache, delta->data_offset);
1683 *outbuf = malloc(fulltext_len);
1684 if (*outbuf == NULL)
1685 return got_error_from_errno("malloc");
1686 memcpy(*outbuf, fulltext, fulltext_len);
1687 *outlen = fulltext_len;
1692 /* Deltas are ordered in ascending order. */
1693 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1694 uint8_t *delta_buf = NULL, *fulltext = NULL;
1695 size_t delta_len, fulltext_len = 0;
1696 uint64_t base_size, result_size = 0;
1699 off_t delta_data_offset;
1701 /* Plain object types are the delta base. */
1702 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1703 delta->type != GOT_OBJ_TYPE_TREE &&
1704 delta->type != GOT_OBJ_TYPE_BLOB &&
1705 delta->type != GOT_OBJ_TYPE_TAG) {
1706 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1710 delta_data_offset = delta->offset + delta->tslen;
1711 if (delta_data_offset >= pack->filesize) {
1712 err = got_error(GOT_ERR_PACK_OFFSET);
1716 if (pack->delta_cache) {
1717 got_delta_cache_get(&delta_buf, &delta_len,
1718 &fulltext, &fulltext_len,
1719 pack->delta_cache, delta_data_offset);
1722 if (delta->size > max_size)
1723 max_size = delta->size;
1724 if (delta->size > fulltext_len)
1725 max_size = fulltext_len;
1728 base_buf = malloc(fulltext_len);
1729 if (base_buf == NULL) {
1730 err = got_error_from_errno("malloc");
1733 memcpy(base_buf, fulltext, fulltext_len);
1734 base_bufsz = fulltext_len;
1735 } else if (pack->map) {
1738 if (delta_data_offset > SIZE_MAX) {
1739 return got_error_fmt(GOT_ERR_RANGE,
1740 "delta %lld offset would "
1742 (long long)delta_data_offset);
1745 mapoff = delta_data_offset;
1746 err = got_inflate_to_mem_mmap(&base_buf,
1747 &base_bufsz, NULL, NULL, pack->map,
1748 mapoff, pack->filesize - mapoff);
1750 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1752 err = got_error_from_errno("lseek");
1755 err = got_inflate_to_mem_fd(&base_buf,
1756 &base_bufsz, NULL, NULL, max_size,
1763 if (pack->delta_cache && fulltext == NULL) {
1764 err = got_delta_cache_add(pack->delta_cache,
1765 delta_data_offset, NULL, 0);
1767 if (err->code != GOT_ERR_NO_SPACE)
1771 err = got_delta_cache_add_fulltext(
1774 base_buf, base_bufsz);
1776 err->code != GOT_ERR_NO_SPACE)
1784 if (pack->delta_cache) {
1785 got_delta_cache_get(&delta_buf, &delta_len,
1786 &fulltext, &fulltext_len,
1787 pack->delta_cache, delta->data_offset);
1789 if (delta_buf == NULL) {
1791 err = read_delta_data(&delta_buf, &delta_len, NULL,
1792 delta->data_offset, pack);
1796 if (pack->delta_cache && !cached) {
1797 err = got_delta_cache_add(pack->delta_cache,
1798 delta->data_offset, delta_buf, delta_len);
1801 else if (err->code != GOT_ERR_NO_SPACE) {
1807 err = got_delta_get_sizes(&base_size, &result_size,
1808 delta_buf, delta_len);
1814 if (base_size > max_size)
1815 max_size = base_size;
1816 if (result_size > max_size)
1817 max_size = result_size;
1818 if (fulltext_len > max_size)
1819 max_size = fulltext_len;
1821 if (max_size > base_bufsz) {
1822 uint8_t *p = realloc(base_buf, max_size);
1824 err = got_error_from_errno("realloc");
1830 base_bufsz = max_size;
1833 if (max_size > accum_bufsz) {
1834 uint8_t *p = realloc(accum_buf, max_size);
1836 err = got_error_from_errno("realloc");
1842 accum_bufsz = max_size;
1846 memcpy(accum_buf, fulltext, fulltext_len);
1847 accum_size = fulltext_len;
1850 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1851 delta_buf, delta_len, accum_buf,
1852 &accum_size, max_size);
1860 if (fulltext == NULL) {
1861 err = got_delta_cache_add_fulltext(pack->delta_cache,
1862 delta->data_offset, accum_buf, accum_size);
1864 if (err->code != GOT_ERR_NO_SPACE)
1870 if (n < deltas->nentries) {
1871 /* Accumulated delta becomes the new base. */
1872 uint8_t *tmp = accum_buf;
1873 size_t tmp_size = accum_bufsz;
1874 accum_buf = base_buf;
1875 accum_bufsz = base_bufsz;
1877 base_bufsz = tmp_size;
1888 *outbuf = accum_buf;
1889 *outlen = accum_size;
1894 const struct got_error *
1895 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1896 FILE *outfile, FILE *base_file, FILE *accum_file)
1898 const struct got_error *err = NULL;
1900 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1901 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1903 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1904 if (obj->pack_offset >= pack->filesize)
1905 return got_error(GOT_ERR_PACK_OFFSET);
1910 if (obj->pack_offset > SIZE_MAX) {
1911 return got_error_fmt(GOT_ERR_RANGE,
1912 "pack offset %lld would overflow size_t",
1913 (long long)obj->pack_offset);
1916 mapoff = obj->pack_offset;
1917 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1918 pack->map, mapoff, pack->filesize - mapoff,
1921 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1922 return got_error_from_errno("lseek");
1923 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1927 err = got_pack_dump_delta_chain_to_file(&obj->size,
1928 &obj->deltas, pack, outfile, base_file, accum_file);
1933 const struct got_error *
1934 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1935 struct got_object *obj, struct got_pack *pack)
1937 const struct got_error *err = NULL;
1939 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1940 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1942 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1943 if (obj->pack_offset >= pack->filesize)
1944 return got_error(GOT_ERR_PACK_OFFSET);
1948 if (obj->pack_offset > SIZE_MAX) {
1949 return got_error_fmt(GOT_ERR_RANGE,
1950 "pack offset %lld would overflow size_t",
1951 (long long)obj->pack_offset);
1954 mapoff = obj->pack_offset;
1955 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1956 pack->map, mapoff, pack->filesize - mapoff);
1958 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1959 return got_error_from_errno("lseek");
1960 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1961 obj->size, pack->fd);
1964 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1970 static const struct got_error *
1971 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1972 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1973 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1975 const struct got_error *err = NULL;
1977 /* Validate decompression and obtain the decompressed size. */
1978 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1979 delta_data_offset, pack);
1983 /* Read delta base/result sizes from head of delta stream. */
1984 err = got_delta_get_sizes(base_size, result_size,
1985 *delta_buf, *delta_len);
1989 /* Discard decompressed delta and read it again in compressed form. */
1991 *delta_buf = malloc(*delta_len_compressed);
1992 if (*delta_buf == NULL) {
1993 err = got_error_from_errno("malloc");
1997 if (delta_data_offset >= pack->filesize) {
1998 err = got_error(GOT_ERR_PACK_OFFSET);
2001 memcpy(*delta_buf, pack->map + delta_data_offset,
2002 *delta_len_compressed);
2005 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
2006 err = got_error_from_errno("lseek");
2009 n = read(pack->fd, *delta_buf, *delta_len_compressed);
2011 err = got_error_from_errno("read");
2013 } else if (n != *delta_len_compressed) {
2014 err = got_error(GOT_ERR_IO);
2023 *delta_len_compressed = 0;
2030 const struct got_error *
2031 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
2032 size_t *delta_compressed_size, off_t *delta_offset,
2033 off_t *delta_data_offset, off_t *base_offset,
2034 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
2035 struct got_pack *pack, struct got_packidx *packidx, int idx)
2037 const struct got_error *err = NULL;
2041 size_t tslen, delta_hdrlen;
2045 *delta_compressed_size = 0;
2047 *delta_data_offset = 0;
2052 offset = got_packidx_get_object_offset(packidx, idx);
2054 return got_error(GOT_ERR_BAD_PACKIDX);
2056 if (offset >= pack->filesize)
2057 return got_error(GOT_ERR_PACK_OFFSET);
2059 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
2064 if (tslen + size < tslen || offset + size < size ||
2065 tslen + offset < tslen)
2066 return got_error(GOT_ERR_PACK_OFFSET);
2069 case GOT_OBJ_TYPE_OFFSET_DELTA:
2070 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
2071 pack, offset, tslen);
2075 case GOT_OBJ_TYPE_REF_DELTA:
2076 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
2079 delta_hdrlen = SHA1_DIGEST_LENGTH;
2082 return got_error_fmt(GOT_ERR_OBJ_TYPE,
2083 "non-delta object type %d found at offset %lld",
2084 type, (long long)offset);
2087 if (tslen + delta_hdrlen < delta_hdrlen ||
2088 offset + delta_hdrlen < delta_hdrlen)
2089 return got_error(GOT_ERR_BAD_DELTA);
2091 *delta_data_offset = offset + tslen + delta_hdrlen;
2092 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
2093 base_size, result_size, *delta_data_offset, pack, packidx);
2097 if (*delta_size != size) {
2098 err = got_error(GOT_ERR_BAD_DELTA);
2102 *delta_offset = offset;
2108 *delta_compressed_size = 0;