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;
675 STAILQ_INIT(matched_ids);
678 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
680 hex[0] = id_str_prefix[0];
681 hex[1] = id_str_prefix[1];
683 if (!got_parse_xdigit(&id0, hex))
684 return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
687 i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
688 oid = &packidx->hdr.sorted_ids[i];
689 while (i < totobj && oid->sha1[0] == id0) {
690 char id_str[SHA1_DIGEST_STRING_LENGTH];
691 struct got_object_qid *qid;
694 if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
695 return got_error(GOT_ERR_NO_SPACE);
697 cmp = strncmp(id_str, id_str_prefix, prefix_len);
699 oid = &packidx->hdr.sorted_ids[++i];
704 err = got_object_qid_alloc_partial(&qid);
707 memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
708 STAILQ_INSERT_TAIL(matched_ids, qid, entry);
710 oid = &packidx->hdr.sorted_ids[++i];
714 got_object_id_queue_free(matched_ids);
719 set_max_datasize(void)
723 if (getrlimit(RLIMIT_DATA, &rl) != 0)
726 rl.rlim_cur = rl.rlim_max;
727 setrlimit(RLIMIT_DATA, &rl);
730 const struct got_error *
731 got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
733 const struct got_error *err = NULL;
736 struct imsgbuf *ibuf;
738 ibuf = calloc(1, sizeof(*ibuf));
740 return got_error_from_errno("calloc");
742 pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
743 if (pack->privsep_child == NULL) {
744 err = got_error_from_errno("calloc");
748 pack->child_has_tempfiles = 0;
749 pack->child_has_delta_outfd = 0;
751 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
752 err = got_error_from_errno("socketpair");
758 err = got_error_from_errno("fork");
760 } else if (pid == 0) {
762 got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
763 pack->path_packfile);
767 if (close(imsg_fds[1]) == -1)
768 return got_error_from_errno("close");
769 pack->privsep_child->imsg_fd = imsg_fds[0];
770 pack->privsep_child->pid = pid;
771 imsg_init(ibuf, imsg_fds[0]);
772 pack->privsep_child->ibuf = ibuf;
774 err = got_privsep_init_pack_child(ibuf, pack, packidx);
776 const struct got_error *child_err;
777 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
778 child_err = got_privsep_wait_for_child(
779 pack->privsep_child->pid);
780 if (child_err && err == NULL)
786 free(pack->privsep_child);
787 pack->privsep_child = NULL;
792 static const struct got_error *
793 pack_stop_privsep_child(struct got_pack *pack)
795 const struct got_error *err = NULL, *close_err = NULL;
797 if (pack->privsep_child == NULL)
800 err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
803 if (close(pack->privsep_child->imsg_fd) == -1)
804 close_err = got_error_from_errno("close");
805 err = got_privsep_wait_for_child(pack->privsep_child->pid);
806 if (close_err && err == NULL)
808 imsg_clear(pack->privsep_child->ibuf);
809 free(pack->privsep_child->ibuf);
810 free(pack->privsep_child);
811 pack->privsep_child = NULL;
815 const struct got_error *
816 got_pack_close(struct got_pack *pack)
818 const struct got_error *err = NULL;
820 err = pack_stop_privsep_child(pack);
821 if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
822 err = got_error_from_errno("munmap");
823 if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
824 err = got_error_from_errno("close");
826 free(pack->path_packfile);
827 pack->path_packfile = NULL;
829 if (pack->delta_cache) {
830 got_delta_cache_free(pack->delta_cache);
831 pack->delta_cache = NULL;
835 * Leave accumfd and basefd alone. They are managed by the
836 * repository layer and can be reused.
842 const struct got_error *
843 got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
844 struct got_pack *pack, off_t offset)
854 if (offset >= pack->filesize)
855 return got_error(GOT_ERR_PACK_OFFSET);
858 if (offset > SIZE_MAX) {
859 return got_error_fmt(GOT_ERR_PACK_OFFSET,
860 "offset %lld overflows size_t",
864 mapoff = (size_t)offset;
866 if (lseek(pack->fd, offset, SEEK_SET) == -1)
867 return got_error_from_errno("lseek");
871 /* We do not support size values which don't fit in 64 bit. */
873 return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
874 "packfile offset %lld", (long long)offset);
877 if (mapoff + sizeof(sizeN) >= pack->filesize)
878 return got_error(GOT_ERR_BAD_PACKFILE);
879 sizeN = *(pack->map + mapoff);
880 mapoff += sizeof(sizeN);
882 ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
884 return got_error_from_errno("read");
885 if (n != sizeof(sizeN))
886 return got_error(GOT_ERR_BAD_PACKFILE);
888 *len += sizeof(sizeN);
891 t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
892 GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
893 s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
895 size_t shift = 4 + 7 * (i - 1);
896 s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
899 } while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
906 static const struct got_error *
907 open_plain_object(struct got_object **obj, struct got_object_id *id,
908 uint8_t type, off_t offset, size_t size, int idx)
910 *obj = calloc(1, sizeof(**obj));
912 return got_error_from_errno("calloc");
915 (*obj)->flags = GOT_OBJ_FLAG_PACKED;
916 (*obj)->pack_idx = idx;
919 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
920 (*obj)->pack_offset = offset;
925 static const struct got_error *
926 parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
937 /* We do not support offset values which don't fit in 64 bit. */
939 return got_error(GOT_ERR_NO_SPACE);
944 if (delta_offset + *len > SIZE_MAX) {
945 return got_error_fmt(GOT_ERR_PACK_OFFSET,
946 "mapoff %lld would overflow size_t",
947 (long long)delta_offset + *len);
950 mapoff = (size_t)delta_offset + *len;
951 if (mapoff + sizeof(offN) >= pack->filesize)
952 return got_error(GOT_ERR_PACK_OFFSET);
953 offN = *(pack->map + mapoff);
956 n = read(pack->fd, &offN, sizeof(offN));
958 return got_error_from_errno("read");
959 if (n != sizeof(offN))
960 return got_error(GOT_ERR_BAD_PACKFILE);
962 *len += sizeof(offN);
965 o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
969 o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
972 } while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
978 const struct got_error *
979 got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
980 struct got_pack *pack, off_t offset, size_t tslen)
982 const struct got_error *err;
988 err = parse_negative_offset(&negoffset, &negofflen, pack,
993 /* Compute the base object's offset (must be in the same pack file). */
994 *base_offset = (offset - negoffset);
995 if (*base_offset <= 0)
996 return got_error(GOT_ERR_BAD_PACKFILE);
1002 static const struct got_error *
1003 read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1004 size_t *delta_compressed_len, size_t delta_data_offset,
1005 struct got_pack *pack)
1007 const struct got_error *err = NULL;
1008 size_t consumed = 0;
1011 if (delta_data_offset >= pack->filesize)
1012 return got_error(GOT_ERR_PACK_OFFSET);
1013 err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1014 &consumed, NULL, pack->map, delta_data_offset,
1015 pack->filesize - delta_data_offset);
1019 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1020 return got_error_from_errno("lseek");
1021 err = got_inflate_to_mem_fd(delta_buf, delta_len,
1022 &consumed, NULL, 0, pack->fd);
1027 if (delta_compressed_len)
1028 *delta_compressed_len = consumed;
1033 static const struct got_error *
1034 add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1035 int delta_type, size_t delta_size, off_t delta_data_offset)
1037 struct got_delta *delta;
1039 delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1042 return got_error_from_errno("got_delta_open");
1043 /* delta is freed in got_object_close() */
1045 STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1049 static const struct got_error *
1050 resolve_offset_delta(struct got_delta_chain *deltas,
1051 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1052 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1054 const struct got_error *err;
1059 off_t delta_data_offset;
1062 err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1063 delta_offset, tslen);
1067 delta_data_offset = delta_offset + tslen + consumed;
1068 if (delta_data_offset >= pack->filesize)
1069 return got_error(GOT_ERR_PACK_OFFSET);
1071 if (pack->map == NULL) {
1072 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1073 if (delta_data_offset == -1)
1074 return got_error_from_errno("lseek");
1077 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1082 /* An offset delta must be in the same packfile. */
1083 if (base_offset >= pack->filesize)
1084 return got_error(GOT_ERR_PACK_OFFSET);
1086 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1087 &base_tslen, pack, base_offset);
1091 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1092 base_tslen, base_type, base_size, recursion - 1);
1095 const struct got_error *
1096 got_pack_parse_ref_delta(struct got_object_id *id,
1097 struct got_pack *pack, off_t delta_offset, int tslen)
1102 if (delta_offset + tslen > SIZE_MAX) {
1103 return got_error_fmt(GOT_ERR_PACK_OFFSET,
1104 "mapoff %lld would overflow size_t",
1105 (long long)delta_offset + tslen);
1108 mapoff = delta_offset + tslen;
1109 if (mapoff + sizeof(*id) >= pack->filesize)
1110 return got_error(GOT_ERR_PACK_OFFSET);
1111 memcpy(id, pack->map + mapoff, sizeof(*id));
1114 n = read(pack->fd, id, sizeof(*id));
1116 return got_error_from_errno("read");
1117 if (n != sizeof(*id))
1118 return got_error(GOT_ERR_BAD_PACKFILE);
1124 static const struct got_error *
1125 resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1126 struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1127 size_t delta_size, unsigned int recursion)
1129 const struct got_error *err;
1130 struct got_object_id id;
1136 off_t delta_data_offset;
1138 if (delta_offset + tslen >= pack->filesize)
1139 return got_error(GOT_ERR_PACK_OFFSET);
1141 err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1145 delta_data_offset = delta_offset + tslen + SHA1_DIGEST_LENGTH;
1147 delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1148 if (delta_data_offset == -1)
1149 return got_error_from_errno("lseek");
1152 err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1157 /* Delta base must be in the same pack file. */
1158 idx = got_packidx_get_object_idx(packidx, &id);
1160 return got_error(GOT_ERR_NO_OBJ);
1162 base_offset = got_packidx_get_object_offset(packidx, idx);
1163 if (base_offset == -1)
1164 return got_error(GOT_ERR_BAD_PACKIDX);
1166 if (base_offset >= pack->filesize)
1167 return got_error(GOT_ERR_PACK_OFFSET);
1169 err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1170 &base_tslen, pack, base_offset);
1174 return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1175 base_tslen, base_type, base_size, recursion - 1);
1178 const struct got_error *
1179 got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1180 struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1181 size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1183 const struct got_error *err = NULL;
1185 if (--recursion == 0)
1186 return got_error(GOT_ERR_RECURSION);
1188 switch (delta_type) {
1189 case GOT_OBJ_TYPE_COMMIT:
1190 case GOT_OBJ_TYPE_TREE:
1191 case GOT_OBJ_TYPE_BLOB:
1192 case GOT_OBJ_TYPE_TAG:
1193 /* Plain types are the final delta base. Recursion ends. */
1194 err = add_delta(deltas, delta_offset, tslen, delta_type,
1197 case GOT_OBJ_TYPE_OFFSET_DELTA:
1198 err = resolve_offset_delta(deltas, packidx, pack,
1199 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1201 case GOT_OBJ_TYPE_REF_DELTA:
1202 err = resolve_ref_delta(deltas, packidx, pack,
1203 delta_offset, tslen, delta_type, delta_size, recursion - 1);
1206 return got_error(GOT_ERR_OBJ_TYPE);
1212 static const struct got_error *
1213 open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1214 struct got_pack *pack, struct got_object_id *id, off_t offset,
1215 size_t tslen, int delta_type, size_t delta_size, int idx)
1217 const struct got_error *err = NULL;
1220 *obj = calloc(1, sizeof(**obj));
1222 return got_error_from_errno("calloc");
1226 (*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1227 memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1228 (*obj)->pack_offset = offset + tslen;
1230 STAILQ_INIT(&(*obj)->deltas.entries);
1231 (*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1232 (*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1233 (*obj)->pack_idx = idx;
1235 err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1236 offset, tslen, delta_type, delta_size,
1237 GOT_DELTA_CHAIN_RECURSION_MAX);
1241 err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1244 (*obj)->type = resolved_type;
1247 got_object_close(*obj);
1253 const struct got_error *
1254 got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1255 struct got_packidx *packidx, int idx, struct got_object_id *id)
1257 const struct got_error *err = NULL;
1265 offset = got_packidx_get_object_offset(packidx, idx);
1267 return got_error(GOT_ERR_BAD_PACKIDX);
1269 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1275 case GOT_OBJ_TYPE_COMMIT:
1276 case GOT_OBJ_TYPE_TREE:
1277 case GOT_OBJ_TYPE_BLOB:
1278 case GOT_OBJ_TYPE_TAG:
1279 err = open_plain_object(obj, id, type, offset + tslen,
1282 case GOT_OBJ_TYPE_OFFSET_DELTA:
1283 case GOT_OBJ_TYPE_REF_DELTA:
1284 err = open_delta_object(obj, packidx, pack, id, offset,
1285 tslen, type, size, idx);
1288 err = got_error(GOT_ERR_OBJ_TYPE);
1295 const struct got_error *
1296 got_pack_get_delta_chain_max_size(uint64_t *max_size,
1297 struct got_delta_chain *deltas, struct got_pack *pack)
1299 struct got_delta *delta;
1300 uint64_t base_size = 0, result_size = 0;
1303 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1304 /* Plain object types are the delta base. */
1305 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1306 delta->type != GOT_OBJ_TYPE_TREE &&
1307 delta->type != GOT_OBJ_TYPE_BLOB &&
1308 delta->type != GOT_OBJ_TYPE_TAG) {
1309 const struct got_error *err;
1310 uint8_t *delta_buf = NULL;
1314 if (pack->delta_cache) {
1315 got_delta_cache_get(&delta_buf, &delta_len,
1316 NULL, NULL, pack->delta_cache,
1317 delta->data_offset);
1319 if (delta_buf == NULL) {
1321 err = read_delta_data(&delta_buf, &delta_len,
1322 NULL, delta->data_offset, pack);
1326 if (pack->delta_cache && !cached) {
1327 err = got_delta_cache_add(pack->delta_cache,
1328 delta->data_offset, delta_buf, delta_len);
1331 else if (err->code != GOT_ERR_NO_SPACE) {
1336 err = got_delta_get_sizes(&base_size, &result_size,
1337 delta_buf, delta_len);
1343 base_size = delta->size;
1344 if (base_size > *max_size)
1345 *max_size = base_size;
1346 if (result_size > *max_size)
1347 *max_size = result_size;
1353 const struct got_error *
1354 got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1355 struct got_pack *pack)
1357 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1358 return got_error(GOT_ERR_OBJ_TYPE);
1360 return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1363 const struct got_error *
1364 got_pack_dump_delta_chain_to_file(size_t *result_size,
1365 struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1366 FILE *base_file, FILE *accum_file)
1368 const struct got_error *err = NULL;
1369 struct got_delta *delta;
1370 uint8_t *base_buf = NULL, *accum_buf = NULL;
1371 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1372 /* We process small enough files entirely in memory for speed. */
1373 const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1374 uint64_t max_size = 0;
1379 if (STAILQ_EMPTY(&deltas->entries))
1380 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1382 if (pack->delta_cache) {
1383 uint8_t *delta_buf = NULL, *fulltext = NULL;
1384 size_t delta_len, fulltext_len;
1386 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1387 got_delta_cache_get(&delta_buf, &delta_len,
1388 &fulltext, &fulltext_len,
1389 pack->delta_cache, delta->data_offset);
1393 w = fwrite(fulltext, 1, fulltext_len, outfile);
1394 if (w != fulltext_len)
1395 return got_ferror(outfile, GOT_ERR_IO);
1396 if (fflush(outfile) != 0)
1397 return got_error_from_errno("fflush");
1398 *result_size = fulltext_len;
1403 if (fseeko(base_file, 0L, SEEK_SET) == -1)
1404 return got_error_from_errno("fseeko");
1405 if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1406 return got_error_from_errno("fseeko");
1408 /* Deltas are ordered in ascending order. */
1409 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1410 uint8_t *delta_buf = NULL, *fulltext = NULL;
1411 size_t delta_len, fulltext_len;
1412 uint64_t base_size, result_size = 0;
1416 off_t delta_data_offset;
1418 /* Plain object types are the delta base. */
1419 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1420 delta->type != GOT_OBJ_TYPE_TREE &&
1421 delta->type != GOT_OBJ_TYPE_BLOB &&
1422 delta->type != GOT_OBJ_TYPE_TAG) {
1423 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1427 delta_data_offset = delta->offset + delta->tslen;
1428 if (delta_data_offset >= pack->filesize) {
1429 err = got_error(GOT_ERR_PACK_OFFSET);
1432 if (pack->map == NULL) {
1433 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1435 err = got_error_from_errno("lseek");
1439 if (delta->size > max_size)
1440 max_size = delta->size;
1441 if (max_size > max_bufsize) {
1443 if (delta_data_offset > SIZE_MAX) {
1444 return got_error_fmt(
1446 "delta offset %lld "
1452 mapoff = delta_data_offset;
1453 err = got_inflate_to_file_mmap(
1454 &base_bufsz, NULL, NULL, pack->map,
1455 mapoff, pack->filesize - mapoff,
1458 err = got_inflate_to_file_fd(
1459 &base_bufsz, NULL, NULL, pack->fd,
1462 accum_buf = malloc(max_size);
1463 if (accum_buf == NULL) {
1464 err = got_error_from_errno("malloc");
1467 accum_bufsz = max_size;
1469 if (delta_data_offset > SIZE_MAX) {
1470 return got_error_fmt(
1472 "delta offset %lld "
1478 mapoff = delta_data_offset;
1479 err = got_inflate_to_mem_mmap(&base_buf,
1480 &base_bufsz, NULL, NULL,
1482 pack->filesize - mapoff);
1484 err = got_inflate_to_mem_fd(&base_buf,
1485 &base_bufsz, NULL, NULL, max_size,
1491 if (base_buf == NULL)
1493 else if (pack->delta_cache && fulltext == NULL) {
1494 err = got_delta_cache_add(pack->delta_cache,
1495 delta_data_offset, NULL, 0);
1497 if (err->code != GOT_ERR_NO_SPACE)
1501 err = got_delta_cache_add_fulltext(
1504 base_buf, base_bufsz);
1506 err->code != GOT_ERR_NO_SPACE)
1514 if (pack->delta_cache) {
1515 got_delta_cache_get(&delta_buf, &delta_len,
1516 &fulltext, &fulltext_len,
1517 pack->delta_cache, delta->data_offset);
1519 if (delta_buf == NULL) {
1521 err = read_delta_data(&delta_buf, &delta_len, NULL,
1522 delta->data_offset, pack);
1526 if (pack->delta_cache && !cached) {
1527 err = got_delta_cache_add(pack->delta_cache,
1528 delta->data_offset, delta_buf, delta_len);
1531 else if (err->code != GOT_ERR_NO_SPACE) {
1537 err = got_delta_get_sizes(&base_size, &result_size,
1538 delta_buf, delta_len);
1544 if (base_size > max_size)
1545 max_size = base_size;
1546 if (result_size > max_size)
1547 max_size = result_size;
1548 if (fulltext_len > max_size)
1549 max_size = fulltext_len;
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;
1593 memcpy(accum_buf, fulltext, fulltext_len);
1594 accum_size = fulltext_len;
1597 err = got_delta_apply_in_mem(base_buf,
1598 base_bufsz, delta_buf, delta_len,
1599 accum_buf, &accum_size, max_size);
1606 if (fulltext == NULL) {
1607 err = got_delta_cache_add_fulltext(
1608 pack->delta_cache, delta->data_offset,
1609 accum_buf, accum_size);
1611 if (err->code != GOT_ERR_NO_SPACE)
1617 err = got_delta_apply(base_file, delta_buf,
1619 /* Final delta application writes to output file. */
1620 ++n < deltas->nentries ? accum_file : outfile,
1628 if (n < deltas->nentries) {
1629 /* Accumulated delta becomes the new base. */
1631 uint8_t *tmp = accum_buf;
1632 size_t tmp_size = accum_bufsz;
1633 accum_buf = base_buf;
1634 accum_bufsz = base_bufsz;
1636 base_bufsz = tmp_size;
1638 FILE *tmp = accum_file;
1639 accum_file = base_file;
1650 size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1652 if (len != accum_size)
1653 err = got_ferror(outfile, GOT_ERR_IO);
1657 *result_size = accum_size;
1661 const struct got_error *
1662 got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1663 struct got_delta_chain *deltas, struct got_pack *pack)
1665 const struct got_error *err = NULL;
1666 struct got_delta *delta;
1667 uint8_t *base_buf = NULL, *accum_buf = NULL;
1668 size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0;
1669 uint64_t max_size = 0;
1675 if (STAILQ_EMPTY(&deltas->entries))
1676 return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1678 if (pack->delta_cache) {
1679 uint8_t *delta_buf = NULL, *fulltext = NULL;
1680 size_t delta_len, fulltext_len;
1682 delta = STAILQ_LAST(&deltas->entries, got_delta, entry);
1683 got_delta_cache_get(&delta_buf, &delta_len,
1684 &fulltext, &fulltext_len,
1685 pack->delta_cache, delta->data_offset);
1687 *outbuf = malloc(fulltext_len);
1688 if (*outbuf == NULL)
1689 return got_error_from_errno("malloc");
1690 memcpy(*outbuf, fulltext, fulltext_len);
1691 *outlen = fulltext_len;
1696 /* Deltas are ordered in ascending order. */
1697 STAILQ_FOREACH(delta, &deltas->entries, entry) {
1698 uint8_t *delta_buf = NULL, *fulltext = NULL;
1699 size_t delta_len, fulltext_len = 0;
1700 uint64_t base_size, result_size = 0;
1703 off_t delta_data_offset;
1705 /* Plain object types are the delta base. */
1706 if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1707 delta->type != GOT_OBJ_TYPE_TREE &&
1708 delta->type != GOT_OBJ_TYPE_BLOB &&
1709 delta->type != GOT_OBJ_TYPE_TAG) {
1710 err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1714 delta_data_offset = delta->offset + delta->tslen;
1715 if (delta_data_offset >= pack->filesize) {
1716 err = got_error(GOT_ERR_PACK_OFFSET);
1720 if (pack->delta_cache) {
1721 got_delta_cache_get(&delta_buf, &delta_len,
1722 &fulltext, &fulltext_len,
1723 pack->delta_cache, delta_data_offset);
1726 if (delta->size > max_size)
1727 max_size = delta->size;
1728 if (delta->size > fulltext_len)
1729 max_size = fulltext_len;
1732 base_buf = malloc(fulltext_len);
1733 if (base_buf == NULL) {
1734 err = got_error_from_errno("malloc");
1737 memcpy(base_buf, fulltext, fulltext_len);
1738 base_bufsz = fulltext_len;
1739 } else if (pack->map) {
1742 if (delta_data_offset > SIZE_MAX) {
1743 return got_error_fmt(GOT_ERR_RANGE,
1744 "delta %lld offset would "
1746 (long long)delta_data_offset);
1749 mapoff = delta_data_offset;
1750 err = got_inflate_to_mem_mmap(&base_buf,
1751 &base_bufsz, NULL, NULL, pack->map,
1752 mapoff, pack->filesize - mapoff);
1754 if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1756 err = got_error_from_errno("lseek");
1759 err = got_inflate_to_mem_fd(&base_buf,
1760 &base_bufsz, NULL, NULL, max_size,
1767 if (pack->delta_cache && fulltext == NULL) {
1768 err = got_delta_cache_add(pack->delta_cache,
1769 delta_data_offset, NULL, 0);
1771 if (err->code != GOT_ERR_NO_SPACE)
1775 err = got_delta_cache_add_fulltext(
1778 base_buf, base_bufsz);
1780 err->code != GOT_ERR_NO_SPACE)
1788 if (pack->delta_cache) {
1789 got_delta_cache_get(&delta_buf, &delta_len,
1790 &fulltext, &fulltext_len,
1791 pack->delta_cache, delta->data_offset);
1793 if (delta_buf == NULL) {
1795 err = read_delta_data(&delta_buf, &delta_len, NULL,
1796 delta->data_offset, pack);
1800 if (pack->delta_cache && !cached) {
1801 err = got_delta_cache_add(pack->delta_cache,
1802 delta->data_offset, delta_buf, delta_len);
1805 else if (err->code != GOT_ERR_NO_SPACE) {
1811 err = got_delta_get_sizes(&base_size, &result_size,
1812 delta_buf, delta_len);
1818 if (base_size > max_size)
1819 max_size = base_size;
1820 if (result_size > max_size)
1821 max_size = result_size;
1822 if (fulltext_len > max_size)
1823 max_size = fulltext_len;
1825 if (max_size > base_bufsz) {
1826 uint8_t *p = realloc(base_buf, max_size);
1828 err = got_error_from_errno("realloc");
1834 base_bufsz = max_size;
1837 if (max_size > accum_bufsz) {
1838 uint8_t *p = realloc(accum_buf, max_size);
1840 err = got_error_from_errno("realloc");
1846 accum_bufsz = max_size;
1850 memcpy(accum_buf, fulltext, fulltext_len);
1851 accum_size = fulltext_len;
1854 err = got_delta_apply_in_mem(base_buf, base_bufsz,
1855 delta_buf, delta_len, accum_buf,
1856 &accum_size, max_size);
1864 if (fulltext == NULL) {
1865 err = got_delta_cache_add_fulltext(pack->delta_cache,
1866 delta->data_offset, accum_buf, accum_size);
1868 if (err->code != GOT_ERR_NO_SPACE)
1874 if (n < deltas->nentries) {
1875 /* Accumulated delta becomes the new base. */
1876 uint8_t *tmp = accum_buf;
1877 size_t tmp_size = accum_bufsz;
1878 accum_buf = base_buf;
1879 accum_bufsz = base_bufsz;
1881 base_bufsz = tmp_size;
1892 *outbuf = accum_buf;
1893 *outlen = accum_size;
1898 const struct got_error *
1899 got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1900 FILE *outfile, FILE *base_file, FILE *accum_file)
1902 const struct got_error *err = NULL;
1904 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1905 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1907 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1908 if (obj->pack_offset >= pack->filesize)
1909 return got_error(GOT_ERR_PACK_OFFSET);
1914 if (obj->pack_offset > SIZE_MAX) {
1915 return got_error_fmt(GOT_ERR_RANGE,
1916 "pack offset %lld would overflow size_t",
1917 (long long)obj->pack_offset);
1920 mapoff = obj->pack_offset;
1921 err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1922 pack->map, mapoff, pack->filesize - mapoff,
1925 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1926 return got_error_from_errno("lseek");
1927 err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1931 err = got_pack_dump_delta_chain_to_file(&obj->size,
1932 &obj->deltas, pack, outfile, base_file, accum_file);
1937 const struct got_error *
1938 got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1939 struct got_object *obj, struct got_pack *pack)
1941 const struct got_error *err = NULL;
1943 if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1944 return got_error(GOT_ERR_OBJ_NOT_PACKED);
1946 if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1947 if (obj->pack_offset >= pack->filesize)
1948 return got_error(GOT_ERR_PACK_OFFSET);
1952 if (obj->pack_offset > SIZE_MAX) {
1953 return got_error_fmt(GOT_ERR_RANGE,
1954 "pack offset %lld would overflow size_t",
1955 (long long)obj->pack_offset);
1958 mapoff = obj->pack_offset;
1959 err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1960 pack->map, mapoff, pack->filesize - mapoff);
1962 if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1963 return got_error_from_errno("lseek");
1964 err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1965 obj->size, pack->fd);
1968 err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1974 static const struct got_error *
1975 read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1976 size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1977 off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1979 const struct got_error *err = NULL;
1981 /* Validate decompression and obtain the decompressed size. */
1982 err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1983 delta_data_offset, pack);
1987 /* Read delta base/result sizes from head of delta stream. */
1988 err = got_delta_get_sizes(base_size, result_size,
1989 *delta_buf, *delta_len);
1993 /* Discard decompressed delta and read it again in compressed form. */
1995 *delta_buf = malloc(*delta_len_compressed);
1996 if (*delta_buf == NULL) {
1997 err = got_error_from_errno("malloc");
2001 if (delta_data_offset >= pack->filesize) {
2002 err = got_error(GOT_ERR_PACK_OFFSET);
2005 memcpy(*delta_buf, pack->map + delta_data_offset,
2006 *delta_len_compressed);
2009 if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
2010 err = got_error_from_errno("lseek");
2013 n = read(pack->fd, *delta_buf, *delta_len_compressed);
2015 err = got_error_from_errno("read");
2017 } else if (n != *delta_len_compressed) {
2018 err = got_error(GOT_ERR_IO);
2027 *delta_len_compressed = 0;
2034 const struct got_error *
2035 got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
2036 size_t *delta_compressed_size, off_t *delta_offset,
2037 off_t *delta_data_offset, off_t *base_offset,
2038 struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
2039 struct got_pack *pack, struct got_packidx *packidx, int idx)
2041 const struct got_error *err = NULL;
2045 size_t tslen, delta_hdrlen;
2049 *delta_compressed_size = 0;
2051 *delta_data_offset = 0;
2056 offset = got_packidx_get_object_offset(packidx, idx);
2058 return got_error(GOT_ERR_BAD_PACKIDX);
2060 if (offset >= pack->filesize)
2061 return got_error(GOT_ERR_PACK_OFFSET);
2063 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
2068 if (tslen + size < tslen || offset + size < size ||
2069 tslen + offset < tslen)
2070 return got_error(GOT_ERR_PACK_OFFSET);
2073 case GOT_OBJ_TYPE_OFFSET_DELTA:
2074 err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
2075 pack, offset, tslen);
2079 case GOT_OBJ_TYPE_REF_DELTA:
2080 err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
2083 delta_hdrlen = SHA1_DIGEST_LENGTH;
2086 return got_error_fmt(GOT_ERR_OBJ_TYPE,
2087 "non-delta object type %d found at offset %lld",
2088 type, (long long)offset);
2091 if (tslen + delta_hdrlen < delta_hdrlen ||
2092 offset + delta_hdrlen < delta_hdrlen)
2093 return got_error(GOT_ERR_BAD_DELTA);
2095 *delta_data_offset = offset + tslen + delta_hdrlen;
2096 err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
2097 base_size, result_size, *delta_data_offset, pack, packidx);
2101 if (*delta_size != size) {
2102 err = got_error(GOT_ERR_BAD_DELTA);
2106 *delta_offset = offset;
2112 *delta_compressed_size = 0;